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Greg Kroah-Hartmane3b3d0f2017-11-06 18:11:51 +01001// SPDX-License-Identifier: GPL-2.0+
John Linn61ec9012011-04-30 00:07:43 -04002/*
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07003 * Cadence UART driver (found in Xilinx Zynq)
John Linn61ec9012011-04-30 00:07:43 -04004 *
Soren Brinkmanne555a212014-04-04 17:23:39 -07005 * 2011 - 2014 (C) Xilinx Inc.
John Linn61ec9012011-04-30 00:07:43 -04006 *
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07007 * This driver has originally been pushed by Xilinx using a Zynq-branding. This
8 * still shows in the naming of this file, the kconfig symbols and some symbols
9 * in the code.
John Linn61ec9012011-04-30 00:07:43 -040010 */
11
12#include <linux/platform_device.h>
John Linn61ec9012011-04-30 00:07:43 -040013#include <linux/serial.h>
Vlad Lungu0c0c47b2013-10-17 14:08:06 -070014#include <linux/console.h>
Jiri Slabyee160a32011-09-01 16:20:57 +020015#include <linux/serial_core.h>
Soren Brinkmann30e1e282013-05-13 10:46:38 -070016#include <linux/slab.h>
Jiri Slabyee160a32011-09-01 16:20:57 +020017#include <linux/tty.h>
18#include <linux/tty_flip.h>
Josh Cartwright2326669c2013-01-21 19:57:41 +010019#include <linux/clk.h>
John Linn61ec9012011-04-30 00:07:43 -040020#include <linux/irq.h>
21#include <linux/io.h>
22#include <linux/of.h>
Paul Gortmaker578b9ce2011-05-27 16:14:23 -040023#include <linux/module.h>
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +053024#include <linux/pm_runtime.h>
Shubhrajyoti Datta277375b2019-05-24 14:41:29 +053025#include <linux/iopoll.h>
John Linn61ec9012011-04-30 00:07:43 -040026
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -070027#define CDNS_UART_TTY_NAME "ttyPS"
28#define CDNS_UART_NAME "xuartps"
Michal Simek8da1a392020-04-03 11:24:31 +020029#define CDNS_UART_MAJOR 0 /* use dynamic node allocation */
Michal Simek18cc7ac82020-04-03 11:24:36 +020030#define CDNS_UART_MINOR 0 /* works best with devtmpfs */
Michal Simek72d68192020-04-03 11:24:34 +020031#define CDNS_UART_NR_PORTS 16
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -070032#define CDNS_UART_FIFO_SIZE 64 /* FIFO size */
Thomas Betker9646e4f2015-03-11 22:39:25 +010033#define CDNS_UART_REGISTER_SPACE 0x1000
Shubhrajyoti Datta277375b2019-05-24 14:41:29 +053034#define TX_TIMEOUT 500000
John Linn61ec9012011-04-30 00:07:43 -040035
Suneel85baf542013-10-17 14:08:08 -070036/* Rx Trigger level */
37static int rx_trigger_level = 56;
Nava kishore Manne26d5a322019-06-12 13:14:39 +020038module_param(rx_trigger_level, uint, 0444);
Suneel85baf542013-10-17 14:08:08 -070039MODULE_PARM_DESC(rx_trigger_level, "Rx trigger level, 1-63 bytes");
40
41/* Rx Timeout */
42static int rx_timeout = 10;
Nava kishore Manne26d5a322019-06-12 13:14:39 +020043module_param(rx_timeout, uint, 0444);
Suneel85baf542013-10-17 14:08:08 -070044MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
45
Soren Brinkmanne555a212014-04-04 17:23:39 -070046/* Register offsets for the UART. */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -080047#define CDNS_UART_CR 0x00 /* Control Register */
48#define CDNS_UART_MR 0x04 /* Mode Register */
49#define CDNS_UART_IER 0x08 /* Interrupt Enable */
50#define CDNS_UART_IDR 0x0C /* Interrupt Disable */
51#define CDNS_UART_IMR 0x10 /* Interrupt Mask */
52#define CDNS_UART_ISR 0x14 /* Interrupt Status */
53#define CDNS_UART_BAUDGEN 0x18 /* Baud Rate Generator */
Nava kishore Manne3816b2f82016-09-15 14:45:29 +053054#define CDNS_UART_RXTOUT 0x1C /* RX Timeout */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -080055#define CDNS_UART_RXWM 0x20 /* RX FIFO Trigger Level */
56#define CDNS_UART_MODEMCR 0x24 /* Modem Control */
57#define CDNS_UART_MODEMSR 0x28 /* Modem Status */
58#define CDNS_UART_SR 0x2C /* Channel Status */
59#define CDNS_UART_FIFO 0x30 /* FIFO */
60#define CDNS_UART_BAUDDIV 0x34 /* Baud Rate Divider */
61#define CDNS_UART_FLOWDEL 0x38 /* Flow Delay */
62#define CDNS_UART_IRRX_PWIDTH 0x3C /* IR Min Received Pulse Width */
63#define CDNS_UART_IRTX_PWIDTH 0x40 /* IR Transmitted pulse Width */
64#define CDNS_UART_TXWM 0x44 /* TX FIFO Trigger Level */
Nava kishore Manne3816b2f82016-09-15 14:45:29 +053065#define CDNS_UART_RXBS 0x48 /* RX FIFO byte status register */
John Linn61ec9012011-04-30 00:07:43 -040066
Soren Brinkmanne555a212014-04-04 17:23:39 -070067/* Control Register Bit Definitions */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -070068#define CDNS_UART_CR_STOPBRK 0x00000100 /* Stop TX break */
69#define CDNS_UART_CR_STARTBRK 0x00000080 /* Set TX break */
70#define CDNS_UART_CR_TX_DIS 0x00000020 /* TX disabled. */
71#define CDNS_UART_CR_TX_EN 0x00000010 /* TX enabled */
72#define CDNS_UART_CR_RX_DIS 0x00000008 /* RX disabled. */
73#define CDNS_UART_CR_RX_EN 0x00000004 /* RX enabled */
74#define CDNS_UART_CR_TXRST 0x00000002 /* TX logic reset */
75#define CDNS_UART_CR_RXRST 0x00000001 /* RX logic reset */
76#define CDNS_UART_CR_RST_TO 0x00000040 /* Restart Timeout Counter */
Nava kishore Manne3816b2f82016-09-15 14:45:29 +053077#define CDNS_UART_RXBS_PARITY 0x00000001 /* Parity error status */
78#define CDNS_UART_RXBS_FRAMING 0x00000002 /* Framing error status */
79#define CDNS_UART_RXBS_BRK 0x00000004 /* Overrun error status */
John Linn61ec9012011-04-30 00:07:43 -040080
Soren Brinkmanne555a212014-04-04 17:23:39 -070081/*
82 * Mode Register:
John Linn61ec9012011-04-30 00:07:43 -040083 * The mode register (MR) defines the mode of transfer as well as the data
84 * format. If this register is modified during transmission or reception,
85 * data validity cannot be guaranteed.
John Linn61ec9012011-04-30 00:07:43 -040086 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -070087#define CDNS_UART_MR_CLKSEL 0x00000001 /* Pre-scalar selection */
88#define CDNS_UART_MR_CHMODE_L_LOOP 0x00000200 /* Local loop back mode */
89#define CDNS_UART_MR_CHMODE_NORM 0x00000000 /* Normal mode */
Yasir-Khan5935a2b2017-01-23 13:26:08 +010090#define CDNS_UART_MR_CHMODE_MASK 0x00000300 /* Mask for mode bits */
John Linn61ec9012011-04-30 00:07:43 -040091
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -070092#define CDNS_UART_MR_STOPMODE_2_BIT 0x00000080 /* 2 stop bits */
93#define CDNS_UART_MR_STOPMODE_1_BIT 0x00000000 /* 1 stop bit */
John Linn61ec9012011-04-30 00:07:43 -040094
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -070095#define CDNS_UART_MR_PARITY_NONE 0x00000020 /* No parity mode */
96#define CDNS_UART_MR_PARITY_MARK 0x00000018 /* Mark parity mode */
97#define CDNS_UART_MR_PARITY_SPACE 0x00000010 /* Space parity mode */
98#define CDNS_UART_MR_PARITY_ODD 0x00000008 /* Odd parity mode */
99#define CDNS_UART_MR_PARITY_EVEN 0x00000000 /* Even parity mode */
John Linn61ec9012011-04-30 00:07:43 -0400100
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700101#define CDNS_UART_MR_CHARLEN_6_BIT 0x00000006 /* 6 bits data */
102#define CDNS_UART_MR_CHARLEN_7_BIT 0x00000004 /* 7 bits data */
103#define CDNS_UART_MR_CHARLEN_8_BIT 0x00000000 /* 8 bits data */
John Linn61ec9012011-04-30 00:07:43 -0400104
Soren Brinkmanne555a212014-04-04 17:23:39 -0700105/*
106 * Interrupt Registers:
John Linn61ec9012011-04-30 00:07:43 -0400107 * Interrupt control logic uses the interrupt enable register (IER) and the
108 * interrupt disable register (IDR) to set the value of the bits in the
109 * interrupt mask register (IMR). The IMR determines whether to pass an
110 * interrupt to the interrupt status register (ISR).
111 * Writing a 1 to IER Enables an interrupt, writing a 1 to IDR disables an
112 * interrupt. IMR and ISR are read only, and IER and IDR are write only.
113 * Reading either IER or IDR returns 0x00.
John Linn61ec9012011-04-30 00:07:43 -0400114 * All four registers have the same bit definitions.
115 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700116#define CDNS_UART_IXR_TOUT 0x00000100 /* RX Timeout error interrupt */
117#define CDNS_UART_IXR_PARITY 0x00000080 /* Parity error interrupt */
118#define CDNS_UART_IXR_FRAMING 0x00000040 /* Framing error interrupt */
119#define CDNS_UART_IXR_OVERRUN 0x00000020 /* Overrun error interrupt */
120#define CDNS_UART_IXR_TXFULL 0x00000010 /* TX FIFO Full interrupt */
121#define CDNS_UART_IXR_TXEMPTY 0x00000008 /* TX FIFO empty interrupt */
122#define CDNS_UART_ISR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt */
123#define CDNS_UART_IXR_RXTRIG 0x00000001 /* RX FIFO trigger interrupt */
124#define CDNS_UART_IXR_RXFULL 0x00000004 /* RX FIFO full interrupt. */
125#define CDNS_UART_IXR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt. */
Nava kishore Manne26068312018-12-18 13:18:42 +0100126#define CDNS_UART_IXR_RXMASK 0x000021e7 /* Valid RX bit mask */
John Linn61ec9012011-04-30 00:07:43 -0400127
Anirudha Sarangia3081892016-09-21 15:01:18 +0100128 /*
129 * Do not enable parity error interrupt for the following
130 * reason: When parity error interrupt is enabled, each Rx
131 * parity error always results in 2 events. The first one
132 * being parity error interrupt and the second one with a
133 * proper Rx interrupt with the incoming data. Disabling
134 * parity error interrupt ensures better handling of parity
135 * error events. With this change, for a parity error case, we
136 * get a Rx interrupt with parity error set in ISR register
137 * and we still handle parity errors in the desired way.
138 */
139
140#define CDNS_UART_RX_IRQS (CDNS_UART_IXR_FRAMING | \
141 CDNS_UART_IXR_OVERRUN | \
142 CDNS_UART_IXR_RXTRIG | \
Soren Brinkmann373e8822016-01-11 17:41:37 -0800143 CDNS_UART_IXR_TOUT)
144
Vlad Lungu0c0c47b2013-10-17 14:08:06 -0700145/* Goes in read_status_mask for break detection as the HW doesn't do it*/
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530146#define CDNS_UART_IXR_BRK 0x00002000
Vlad Lungu0c0c47b2013-10-17 14:08:06 -0700147
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530148#define CDNS_UART_RXBS_SUPPORT BIT(1)
Soren Brinkmanne555a212014-04-04 17:23:39 -0700149/*
Lars-Peter Clausen19038ad2014-11-05 13:35:16 +0100150 * Modem Control register:
151 * The read/write Modem Control register controls the interface with the modem
152 * or data set, or a peripheral device emulating a modem.
153 */
154#define CDNS_UART_MODEMCR_FCM 0x00000020 /* Automatic flow control mode */
155#define CDNS_UART_MODEMCR_RTS 0x00000002 /* Request to send output control */
156#define CDNS_UART_MODEMCR_DTR 0x00000001 /* Data Terminal Ready */
157
158/*
Maarten Brock422c6d32019-11-25 18:45:29 +0530159 * Modem Status register:
160 * The read/write Modem Status register reports the interface with the modem
161 * or data set, or a peripheral device emulating a modem.
162 */
163#define CDNS_UART_MODEMSR_DCD BIT(7) /* Data Carrier Detect */
164#define CDNS_UART_MODEMSR_RI BIT(6) /* Ting Indicator */
165#define CDNS_UART_MODEMSR_DSR BIT(5) /* Data Set Ready */
166#define CDNS_UART_MODEMSR_CTS BIT(4) /* Clear To Send */
167
168/*
Soren Brinkmanne555a212014-04-04 17:23:39 -0700169 * Channel Status Register:
John Linn61ec9012011-04-30 00:07:43 -0400170 * The channel status register (CSR) is provided to enable the control logic
171 * to monitor the status of bits in the channel interrupt status register,
172 * even if these are masked out by the interrupt mask register.
173 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700174#define CDNS_UART_SR_RXEMPTY 0x00000002 /* RX FIFO empty */
175#define CDNS_UART_SR_TXEMPTY 0x00000008 /* TX FIFO empty */
176#define CDNS_UART_SR_TXFULL 0x00000010 /* TX FIFO full */
177#define CDNS_UART_SR_RXTRIG 0x00000001 /* Rx Trigger */
Helmut Grohnede4ed392018-06-04 12:22:11 +0200178#define CDNS_UART_SR_TACTIVE 0x00000800 /* TX state machine active */
John Linn61ec9012011-04-30 00:07:43 -0400179
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700180/* baud dividers min/max values */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700181#define CDNS_UART_BDIV_MIN 4
182#define CDNS_UART_BDIV_MAX 255
183#define CDNS_UART_CD_MAX 65535
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +0530184#define UART_AUTOSUSPEND_TIMEOUT 3000
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700185
John Linn61ec9012011-04-30 00:07:43 -0400186/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700187 * struct cdns_uart - device data
Michal Simek489810a12014-04-04 17:23:37 -0700188 * @port: Pointer to the UART port
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700189 * @uartclk: Reference clock
190 * @pclk: APB clock
Michal Simek46a460f2018-09-03 15:10:52 +0200191 * @cdns_uart_driver: Pointer to UART driver
Michal Simek489810a12014-04-04 17:23:37 -0700192 * @baud: Current baud rate
193 * @clk_rate_change_nb: Notifier block for clock changes
Nava kishore Manne094094a2017-05-26 13:13:18 +0200194 * @quirks: Flags for RXBS support.
Lee Jonesb482bd72020-11-04 19:35:35 +0000195 * @cts_override: Modem control state override
Soren Brinkmann30e1e282013-05-13 10:46:38 -0700196 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700197struct cdns_uart {
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700198 struct uart_port *port;
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700199 struct clk *uartclk;
200 struct clk *pclk;
Michal Simek46a460f2018-09-03 15:10:52 +0200201 struct uart_driver *cdns_uart_driver;
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700202 unsigned int baud;
203 struct notifier_block clk_rate_change_nb;
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530204 u32 quirks;
Shubhrajyoti Datta18631782019-04-09 13:15:24 +0530205 bool cts_override;
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530206};
207struct cdns_platform_data {
208 u32 quirks;
Soren Brinkmann30e1e282013-05-13 10:46:38 -0700209};
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700210#define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \
Nava kishore Manne7be7a012019-06-12 13:14:42 +0200211 clk_rate_change_nb)
Soren Brinkmann30e1e282013-05-13 10:46:38 -0700212
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100213/**
214 * cdns_uart_handle_rx - Handle the received bytes along with Rx errors.
215 * @dev_id: Id of the UART port
216 * @isrstatus: The interrupt status register value as read
217 * Return: None
218 */
219static void cdns_uart_handle_rx(void *dev_id, unsigned int isrstatus)
John Linn61ec9012011-04-30 00:07:43 -0400220{
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100221 struct uart_port *port = (struct uart_port *)dev_id;
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530222 struct cdns_uart *cdns_uart = port->private_data;
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100223 unsigned int data;
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530224 unsigned int rxbs_status = 0;
225 unsigned int status_mask;
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100226 unsigned int framerrprocessed = 0;
227 char status = TTY_NORMAL;
228 bool is_rxbs_support;
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530229
230 is_rxbs_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT;
231
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100232 while ((readl(port->membase + CDNS_UART_SR) &
233 CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530234 if (is_rxbs_support)
235 rxbs_status = readl(port->membase + CDNS_UART_RXBS);
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800236 data = readl(port->membase + CDNS_UART_FIFO);
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100237 port->icount.rx++;
238 /*
239 * There is no hardware break detection in Zynq, so we interpret
240 * framing error with all-zeros data as a break sequence.
241 * Most of the time, there's another non-zero byte at the
242 * end of the sequence.
243 */
244 if (!is_rxbs_support && (isrstatus & CDNS_UART_IXR_FRAMING)) {
245 if (!data) {
246 port->read_status_mask |= CDNS_UART_IXR_BRK;
247 framerrprocessed = 1;
Soren Brinkmann354fb1a2016-01-11 17:41:38 -0800248 continue;
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100249 }
Soren Brinkmann354fb1a2016-01-11 17:41:38 -0800250 }
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530251 if (is_rxbs_support && (rxbs_status & CDNS_UART_RXBS_BRK)) {
252 port->icount.brk++;
253 status = TTY_BREAK;
254 if (uart_handle_break(port))
255 continue;
256 }
Vlad Lungu0c0c47b2013-10-17 14:08:06 -0700257
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100258 isrstatus &= port->read_status_mask;
259 isrstatus &= ~port->ignore_status_mask;
260 status_mask = port->read_status_mask;
261 status_mask &= ~port->ignore_status_mask;
Vlad Lungu0c0c47b2013-10-17 14:08:06 -0700262
Nava kishore Manne212d2492016-09-22 16:58:15 +0100263 if (data &&
264 (port->read_status_mask & CDNS_UART_IXR_BRK)) {
265 port->read_status_mask &= ~CDNS_UART_IXR_BRK;
266 port->icount.brk++;
267 if (uart_handle_break(port))
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100268 continue;
John Linn61ec9012011-04-30 00:07:43 -0400269 }
Nava kishore Manne212d2492016-09-22 16:58:15 +0100270
271 if (uart_handle_sysrq_char(port, data))
272 continue;
273
274 if (is_rxbs_support) {
275 if ((rxbs_status & CDNS_UART_RXBS_PARITY)
276 && (status_mask & CDNS_UART_IXR_PARITY)) {
277 port->icount.parity++;
278 status = TTY_PARITY;
279 }
280 if ((rxbs_status & CDNS_UART_RXBS_FRAMING)
281 && (status_mask & CDNS_UART_IXR_PARITY)) {
282 port->icount.frame++;
283 status = TTY_FRAME;
284 }
285 } else {
286 if (isrstatus & CDNS_UART_IXR_PARITY) {
287 port->icount.parity++;
288 status = TTY_PARITY;
289 }
290 if ((isrstatus & CDNS_UART_IXR_FRAMING) &&
291 !framerrprocessed) {
292 port->icount.frame++;
293 status = TTY_FRAME;
294 }
295 }
296 if (isrstatus & CDNS_UART_IXR_OVERRUN) {
297 port->icount.overrun++;
298 tty_insert_flip_char(&port->state->port, 0,
299 TTY_OVERRUN);
300 }
301 tty_insert_flip_char(&port->state->port, data, status);
302 isrstatus = 0;
John Linn61ec9012011-04-30 00:07:43 -0400303 }
Johan Hovold348fbd62021-04-21 11:55:09 +0200304
Soren Brinkmann354fb1a2016-01-11 17:41:38 -0800305 tty_flip_buffer_push(&port->state->port);
Soren Brinkmann5ede4a52015-12-26 02:43:56 -0800306}
307
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100308/**
309 * cdns_uart_handle_tx - Handle the bytes to be Txed.
310 * @dev_id: Id of the UART port
311 * Return: None
312 */
313static void cdns_uart_handle_tx(void *dev_id)
Soren Brinkmann079865802016-01-11 17:41:41 -0800314{
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100315 struct uart_port *port = (struct uart_port *)dev_id;
Soren Brinkmann079865802016-01-11 17:41:41 -0800316 unsigned int numbytes;
317
318 if (uart_circ_empty(&port->state->xmit)) {
319 writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IDR);
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100320 } else {
321 numbytes = port->fifosize;
322 while (numbytes && !uart_circ_empty(&port->state->xmit) &&
Nava kishore Mannea53f82d2019-06-12 13:14:41 +0200323 !(readl(port->membase + CDNS_UART_SR) &
324 CDNS_UART_SR_TXFULL)) {
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100325 /*
326 * Get the data from the UART circular buffer
327 * and write it to the cdns_uart's TX_FIFO
328 * register.
329 */
330 writel(
Nava kishore Manneb6415f22019-06-12 13:14:40 +0200331 port->state->xmit.buf[port->state->xmit.tail],
332 port->membase + CDNS_UART_FIFO);
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100333
334 port->icount.tx++;
335
336 /*
337 * Adjust the tail of the UART buffer and wrap
338 * the buffer if it reaches limit.
339 */
340 port->state->xmit.tail =
341 (port->state->xmit.tail + 1) &
342 (UART_XMIT_SIZE - 1);
343
344 numbytes--;
345 }
346
347 if (uart_circ_chars_pending(
348 &port->state->xmit) < WAKEUP_CHARS)
349 uart_write_wakeup(port);
Soren Brinkmann079865802016-01-11 17:41:41 -0800350 }
Soren Brinkmann079865802016-01-11 17:41:41 -0800351}
352
Soren Brinkmann5ede4a52015-12-26 02:43:56 -0800353/**
354 * cdns_uart_isr - Interrupt handler
355 * @irq: Irq number
356 * @dev_id: Id of the port
357 *
358 * Return: IRQHANDLED
359 */
360static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
361{
362 struct uart_port *port = (struct uart_port *)dev_id;
Soren Brinkmann079865802016-01-11 17:41:41 -0800363 unsigned int isrstatus;
Soren Brinkmann5ede4a52015-12-26 02:43:56 -0800364
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100365 spin_lock(&port->lock);
Soren Brinkmann5ede4a52015-12-26 02:43:56 -0800366
367 /* Read the interrupt status register to determine which
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100368 * interrupt(s) is/are active and clear them.
Soren Brinkmann5ede4a52015-12-26 02:43:56 -0800369 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800370 isrstatus = readl(port->membase + CDNS_UART_ISR);
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800371 writel(isrstatus, port->membase + CDNS_UART_ISR);
John Linn61ec9012011-04-30 00:07:43 -0400372
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100373 if (isrstatus & CDNS_UART_IXR_TXEMPTY) {
374 cdns_uart_handle_tx(dev_id);
375 isrstatus &= ~CDNS_UART_IXR_TXEMPTY;
376 }
Anssi Hannula7abab162019-02-15 18:45:08 +0200377
378 /*
379 * Skip RX processing if RX is disabled as RXEMPTY will never be set
380 * as read bytes will not be removed from the FIFO.
381 */
382 if (isrstatus & CDNS_UART_IXR_RXMASK &&
383 !(readl(port->membase + CDNS_UART_CR) & CDNS_UART_CR_RX_DIS))
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100384 cdns_uart_handle_rx(dev_id, isrstatus);
John Linn61ec9012011-04-30 00:07:43 -0400385
Anirudha Sarangic8dbdc82016-09-22 16:58:14 +0100386 spin_unlock(&port->lock);
John Linn61ec9012011-04-30 00:07:43 -0400387 return IRQ_HANDLED;
388}
389
390/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700391 * cdns_uart_calc_baud_divs - Calculate baud rate divisors
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700392 * @clk: UART module input clock
393 * @baud: Desired baud rate
394 * @rbdiv: BDIV value (return value)
395 * @rcd: CD value (return value)
396 * @div8: Value for clk_sel bit in mod (return value)
Michal Simek489810a12014-04-04 17:23:37 -0700397 * Return: baud rate, requested baud when possible, or actual baud when there
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700398 * was too much error, zero if no valid divisors are found.
399 *
400 * Formula to obtain baud rate is
401 * baud_tx/rx rate = clk/CD * (BDIV + 1)
402 * input_clk = (Uart User Defined Clock or Apb Clock)
403 * depends on UCLKEN in MR Reg
404 * clk = input_clk or input_clk/8;
405 * depends on CLKS in MR reg
406 * CD and BDIV depends on values in
407 * baud rate generate register
408 * baud rate clock divisor register
409 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700410static unsigned int cdns_uart_calc_baud_divs(unsigned int clk,
411 unsigned int baud, u32 *rbdiv, u32 *rcd, int *div8)
John Linn61ec9012011-04-30 00:07:43 -0400412{
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700413 u32 cd, bdiv;
414 unsigned int calc_baud;
415 unsigned int bestbaud = 0;
John Linn61ec9012011-04-30 00:07:43 -0400416 unsigned int bauderror;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700417 unsigned int besterror = ~0;
John Linn61ec9012011-04-30 00:07:43 -0400418
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700419 if (baud < clk / ((CDNS_UART_BDIV_MAX + 1) * CDNS_UART_CD_MAX)) {
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700420 *div8 = 1;
421 clk /= 8;
422 } else {
423 *div8 = 0;
424 }
John Linn61ec9012011-04-30 00:07:43 -0400425
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700426 for (bdiv = CDNS_UART_BDIV_MIN; bdiv <= CDNS_UART_BDIV_MAX; bdiv++) {
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700427 cd = DIV_ROUND_CLOSEST(clk, baud * (bdiv + 1));
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700428 if (cd < 1 || cd > CDNS_UART_CD_MAX)
John Linn61ec9012011-04-30 00:07:43 -0400429 continue;
430
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700431 calc_baud = clk / (cd * (bdiv + 1));
John Linn61ec9012011-04-30 00:07:43 -0400432
433 if (baud > calc_baud)
434 bauderror = baud - calc_baud;
435 else
436 bauderror = calc_baud - baud;
437
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700438 if (besterror > bauderror) {
439 *rbdiv = bdiv;
440 *rcd = cd;
441 bestbaud = calc_baud;
442 besterror = bauderror;
John Linn61ec9012011-04-30 00:07:43 -0400443 }
444 }
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700445 /* use the values when percent error is acceptable */
446 if (((besterror * 100) / baud) < 3)
447 bestbaud = baud;
John Linn61ec9012011-04-30 00:07:43 -0400448
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700449 return bestbaud;
450}
451
452/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700453 * cdns_uart_set_baud_rate - Calculate and set the baud rate
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700454 * @port: Handle to the uart port structure
455 * @baud: Baud rate to set
Michal Simek489810a12014-04-04 17:23:37 -0700456 * Return: baud rate, requested baud when possible, or actual baud when there
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700457 * was too much error, zero if no valid divisors are found.
458 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700459static unsigned int cdns_uart_set_baud_rate(struct uart_port *port,
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700460 unsigned int baud)
461{
462 unsigned int calc_baud;
Soren Brinkmannd54b1812013-10-21 16:40:59 -0700463 u32 cd = 0, bdiv = 0;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700464 u32 mreg;
465 int div8;
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700466 struct cdns_uart *cdns_uart = port->private_data;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700467
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700468 calc_baud = cdns_uart_calc_baud_divs(port->uartclk, baud, &bdiv, &cd,
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700469 &div8);
470
471 /* Write new divisors to hardware */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800472 mreg = readl(port->membase + CDNS_UART_MR);
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700473 if (div8)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700474 mreg |= CDNS_UART_MR_CLKSEL;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700475 else
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700476 mreg &= ~CDNS_UART_MR_CLKSEL;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800477 writel(mreg, port->membase + CDNS_UART_MR);
478 writel(cd, port->membase + CDNS_UART_BAUDGEN);
479 writel(bdiv, port->membase + CDNS_UART_BAUDDIV);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700480 cdns_uart->baud = baud;
John Linn61ec9012011-04-30 00:07:43 -0400481
482 return calc_baud;
483}
484
Soren Brinkmann7ac57342013-10-21 16:41:01 -0700485#ifdef CONFIG_COMMON_CLK
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700486/**
Lee Jonesb50155c62021-05-20 13:19:06 +0100487 * cdns_uart_clk_notifier_cb - Clock notifier callback
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700488 * @nb: Notifier block
489 * @event: Notify event
490 * @data: Notifier data
Soren Brinkmanne555a212014-04-04 17:23:39 -0700491 * Return: NOTIFY_OK or NOTIFY_DONE on success, NOTIFY_BAD on error.
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700492 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700493static int cdns_uart_clk_notifier_cb(struct notifier_block *nb,
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700494 unsigned long event, void *data)
495{
496 u32 ctrl_reg;
497 struct uart_port *port;
498 int locked = 0;
499 struct clk_notifier_data *ndata = data;
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700500 struct cdns_uart *cdns_uart = to_cdns_uart(nb);
Johan Hovold18ee37e2021-05-19 11:25:41 +0200501 unsigned long flags;
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700502
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700503 port = cdns_uart->port;
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700504 if (port->suspended)
505 return NOTIFY_OK;
506
507 switch (event) {
508 case PRE_RATE_CHANGE:
509 {
Soren Brinkmanne555a212014-04-04 17:23:39 -0700510 u32 bdiv, cd;
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700511 int div8;
512
513 /*
514 * Find out if current baud-rate can be achieved with new clock
515 * frequency.
516 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700517 if (!cdns_uart_calc_baud_divs(ndata->new_rate, cdns_uart->baud,
Soren Brinkmann5ce15d22014-04-04 17:23:40 -0700518 &bdiv, &cd, &div8)) {
519 dev_warn(port->dev, "clock rate change rejected\n");
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700520 return NOTIFY_BAD;
Soren Brinkmann5ce15d22014-04-04 17:23:40 -0700521 }
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700522
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700523 spin_lock_irqsave(&cdns_uart->port->lock, flags);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700524
525 /* Disable the TX and RX to set baud rate */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800526 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700527 ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800528 writel(ctrl_reg, port->membase + CDNS_UART_CR);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700529
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700530 spin_unlock_irqrestore(&cdns_uart->port->lock, flags);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700531
532 return NOTIFY_OK;
533 }
534 case POST_RATE_CHANGE:
535 /*
536 * Set clk dividers to generate correct baud with new clock
537 * frequency.
538 */
539
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700540 spin_lock_irqsave(&cdns_uart->port->lock, flags);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700541
542 locked = 1;
543 port->uartclk = ndata->new_rate;
544
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700545 cdns_uart->baud = cdns_uart_set_baud_rate(cdns_uart->port,
546 cdns_uart->baud);
Gustavo A. R. Silvadf561f662020-08-23 17:36:59 -0500547 fallthrough;
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700548 case ABORT_RATE_CHANGE:
549 if (!locked)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700550 spin_lock_irqsave(&cdns_uart->port->lock, flags);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700551
552 /* Set TX/RX Reset */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800553 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700554 ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800555 writel(ctrl_reg, port->membase + CDNS_UART_CR);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700556
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800557 while (readl(port->membase + CDNS_UART_CR) &
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700558 (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700559 cpu_relax();
560
561 /*
562 * Clear the RX disable and TX disable bits and then set the TX
563 * enable bit and RX enable bit to enable the transmitter and
564 * receiver.
565 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800566 writel(rx_timeout, port->membase + CDNS_UART_RXTOUT);
567 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700568 ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
569 ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800570 writel(ctrl_reg, port->membase + CDNS_UART_CR);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700571
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700572 spin_unlock_irqrestore(&cdns_uart->port->lock, flags);
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700573
574 return NOTIFY_OK;
575 default:
576 return NOTIFY_DONE;
577 }
578}
Soren Brinkmann7ac57342013-10-21 16:41:01 -0700579#endif
Soren Brinkmannc4b05102013-10-17 14:08:11 -0700580
John Linn61ec9012011-04-30 00:07:43 -0400581/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700582 * cdns_uart_start_tx - Start transmitting bytes
John Linn61ec9012011-04-30 00:07:43 -0400583 * @port: Handle to the uart port structure
Michal Simek489810a12014-04-04 17:23:37 -0700584 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700585static void cdns_uart_start_tx(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400586{
Soren Brinkmann079865802016-01-11 17:41:41 -0800587 unsigned int status;
John Linn61ec9012011-04-30 00:07:43 -0400588
Soren Brinkmannea8dd8e2015-12-26 02:43:51 -0800589 if (uart_tx_stopped(port))
John Linn61ec9012011-04-30 00:07:43 -0400590 return;
591
Soren Brinkmanne3538c32015-12-26 02:43:49 -0800592 /*
593 * Set the TX enable bit and clear the TX disable bit to enable the
John Linn61ec9012011-04-30 00:07:43 -0400594 * transmitter.
595 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800596 status = readl(port->membase + CDNS_UART_CR);
Soren Brinkmanne3538c32015-12-26 02:43:49 -0800597 status &= ~CDNS_UART_CR_TX_DIS;
598 status |= CDNS_UART_CR_TX_EN;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800599 writel(status, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400600
Soren Brinkmannea8dd8e2015-12-26 02:43:51 -0800601 if (uart_circ_empty(&port->state->xmit))
602 return;
603
Soren Brinkmann079865802016-01-11 17:41:41 -0800604 cdns_uart_handle_tx(port);
John Linn61ec9012011-04-30 00:07:43 -0400605
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800606 writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_ISR);
John Linn61ec9012011-04-30 00:07:43 -0400607 /* Enable the TX Empty interrupt */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800608 writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IER);
John Linn61ec9012011-04-30 00:07:43 -0400609}
610
611/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700612 * cdns_uart_stop_tx - Stop TX
John Linn61ec9012011-04-30 00:07:43 -0400613 * @port: Handle to the uart port structure
Michal Simek489810a12014-04-04 17:23:37 -0700614 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700615static void cdns_uart_stop_tx(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400616{
617 unsigned int regval;
618
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800619 regval = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700620 regval |= CDNS_UART_CR_TX_DIS;
John Linn61ec9012011-04-30 00:07:43 -0400621 /* Disable the transmitter */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800622 writel(regval, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400623}
624
625/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700626 * cdns_uart_stop_rx - Stop RX
John Linn61ec9012011-04-30 00:07:43 -0400627 * @port: Handle to the uart port structure
Michal Simek489810a12014-04-04 17:23:37 -0700628 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700629static void cdns_uart_stop_rx(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400630{
631 unsigned int regval;
632
Soren Brinkmann373e8822016-01-11 17:41:37 -0800633 /* Disable RX IRQs */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800634 writel(CDNS_UART_RX_IRQS, port->membase + CDNS_UART_IDR);
Soren Brinkmann373e8822016-01-11 17:41:37 -0800635
636 /* Disable the receiver */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800637 regval = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700638 regval |= CDNS_UART_CR_RX_DIS;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800639 writel(regval, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400640}
641
642/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700643 * cdns_uart_tx_empty - Check whether TX is empty
John Linn61ec9012011-04-30 00:07:43 -0400644 * @port: Handle to the uart port structure
645 *
Michal Simek489810a12014-04-04 17:23:37 -0700646 * Return: TIOCSER_TEMT on success, 0 otherwise
647 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700648static unsigned int cdns_uart_tx_empty(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400649{
650 unsigned int status;
651
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800652 status = readl(port->membase + CDNS_UART_SR) &
Raviteja Narayanam706bbc52020-03-19 15:14:51 +0530653 (CDNS_UART_SR_TXEMPTY | CDNS_UART_SR_TACTIVE);
654 return (status == CDNS_UART_SR_TXEMPTY) ? TIOCSER_TEMT : 0;
John Linn61ec9012011-04-30 00:07:43 -0400655}
656
657/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700658 * cdns_uart_break_ctl - Based on the input ctl we have to start or stop
John Linn61ec9012011-04-30 00:07:43 -0400659 * transmitting char breaks
660 * @port: Handle to the uart port structure
661 * @ctl: Value based on which start or stop decision is taken
Michal Simek489810a12014-04-04 17:23:37 -0700662 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700663static void cdns_uart_break_ctl(struct uart_port *port, int ctl)
John Linn61ec9012011-04-30 00:07:43 -0400664{
665 unsigned int status;
666 unsigned long flags;
667
668 spin_lock_irqsave(&port->lock, flags);
669
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800670 status = readl(port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400671
672 if (ctl == -1)
Thomas Betker19f22ef2015-03-12 22:11:59 +0100673 writel(CDNS_UART_CR_STARTBRK | status,
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800674 port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400675 else {
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700676 if ((status & CDNS_UART_CR_STOPBRK) == 0)
Thomas Betker19f22ef2015-03-12 22:11:59 +0100677 writel(CDNS_UART_CR_STOPBRK | status,
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800678 port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400679 }
680 spin_unlock_irqrestore(&port->lock, flags);
681}
682
683/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700684 * cdns_uart_set_termios - termios operations, handling data length, parity,
John Linn61ec9012011-04-30 00:07:43 -0400685 * stop bits, flow control, baud rate
686 * @port: Handle to the uart port structure
687 * @termios: Handle to the input termios structure
688 * @old: Values of the previously saved termios structure
Michal Simek489810a12014-04-04 17:23:37 -0700689 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700690static void cdns_uart_set_termios(struct uart_port *port,
John Linn61ec9012011-04-30 00:07:43 -0400691 struct ktermios *termios, struct ktermios *old)
692{
Maarten Brock6d8bf782019-11-25 18:45:30 +0530693 u32 cval = 0;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700694 unsigned int baud, minbaud, maxbaud;
John Linn61ec9012011-04-30 00:07:43 -0400695 unsigned long flags;
Raviteja Narayanam97451852020-03-19 15:14:50 +0530696 unsigned int ctrl_reg, mode_reg;
John Linn61ec9012011-04-30 00:07:43 -0400697
Shubhrajyoti Datta10747562019-05-24 14:41:28 +0530698 spin_lock_irqsave(&port->lock, flags);
John Linn61ec9012011-04-30 00:07:43 -0400699
700 /* Disable the TX and RX to set baud rate */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800701 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700702 ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800703 writel(ctrl_reg, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400704
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700705 /*
706 * Min baud rate = 6bps and Max Baud Rate is 10Mbps for 100Mhz clk
707 * min and max baud should be calculated here based on port->uartclk.
708 * this way we get a valid baud and can safely call set_baud()
709 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700710 minbaud = port->uartclk /
711 ((CDNS_UART_BDIV_MAX + 1) * CDNS_UART_CD_MAX * 8);
712 maxbaud = port->uartclk / (CDNS_UART_BDIV_MIN + 1);
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700713 baud = uart_get_baud_rate(port, termios, old, minbaud, maxbaud);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700714 baud = cdns_uart_set_baud_rate(port, baud);
John Linn61ec9012011-04-30 00:07:43 -0400715 if (tty_termios_baud_rate(termios))
716 tty_termios_encode_baud_rate(termios, baud, baud);
717
Soren Brinkmanne555a212014-04-04 17:23:39 -0700718 /* Update the per-port timeout. */
John Linn61ec9012011-04-30 00:07:43 -0400719 uart_update_timeout(port, termios->c_cflag, baud);
720
721 /* Set TX/RX Reset */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800722 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700723 ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800724 writel(ctrl_reg, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400725
Nava kishore Manne27b17ae2016-09-15 14:45:31 +0530726 while (readl(port->membase + CDNS_UART_CR) &
727 (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
728 cpu_relax();
729
Soren Brinkmanne555a212014-04-04 17:23:39 -0700730 /*
731 * Clear the RX disable and TX disable bits and then set the TX enable
John Linn61ec9012011-04-30 00:07:43 -0400732 * bit and RX enable bit to enable the transmitter and receiver.
733 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800734 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700735 ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
736 ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800737 writel(ctrl_reg, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400738
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800739 writel(rx_timeout, port->membase + CDNS_UART_RXTOUT);
John Linn61ec9012011-04-30 00:07:43 -0400740
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700741 port->read_status_mask = CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_RXTRIG |
742 CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_TOUT;
John Linn61ec9012011-04-30 00:07:43 -0400743 port->ignore_status_mask = 0;
744
745 if (termios->c_iflag & INPCK)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700746 port->read_status_mask |= CDNS_UART_IXR_PARITY |
747 CDNS_UART_IXR_FRAMING;
John Linn61ec9012011-04-30 00:07:43 -0400748
749 if (termios->c_iflag & IGNPAR)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700750 port->ignore_status_mask |= CDNS_UART_IXR_PARITY |
751 CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN;
John Linn61ec9012011-04-30 00:07:43 -0400752
753 /* ignore all characters if CREAD is not set */
754 if ((termios->c_cflag & CREAD) == 0)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700755 port->ignore_status_mask |= CDNS_UART_IXR_RXTRIG |
756 CDNS_UART_IXR_TOUT | CDNS_UART_IXR_PARITY |
757 CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN;
John Linn61ec9012011-04-30 00:07:43 -0400758
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800759 mode_reg = readl(port->membase + CDNS_UART_MR);
John Linn61ec9012011-04-30 00:07:43 -0400760
761 /* Handling Data Size */
762 switch (termios->c_cflag & CSIZE) {
763 case CS6:
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700764 cval |= CDNS_UART_MR_CHARLEN_6_BIT;
John Linn61ec9012011-04-30 00:07:43 -0400765 break;
766 case CS7:
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700767 cval |= CDNS_UART_MR_CHARLEN_7_BIT;
John Linn61ec9012011-04-30 00:07:43 -0400768 break;
769 default:
770 case CS8:
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700771 cval |= CDNS_UART_MR_CHARLEN_8_BIT;
John Linn61ec9012011-04-30 00:07:43 -0400772 termios->c_cflag &= ~CSIZE;
773 termios->c_cflag |= CS8;
774 break;
775 }
776
777 /* Handling Parity and Stop Bits length */
778 if (termios->c_cflag & CSTOPB)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700779 cval |= CDNS_UART_MR_STOPMODE_2_BIT; /* 2 STOP bits */
John Linn61ec9012011-04-30 00:07:43 -0400780 else
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700781 cval |= CDNS_UART_MR_STOPMODE_1_BIT; /* 1 STOP bit */
John Linn61ec9012011-04-30 00:07:43 -0400782
783 if (termios->c_cflag & PARENB) {
784 /* Mark or Space parity */
785 if (termios->c_cflag & CMSPAR) {
786 if (termios->c_cflag & PARODD)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700787 cval |= CDNS_UART_MR_PARITY_MARK;
John Linn61ec9012011-04-30 00:07:43 -0400788 else
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700789 cval |= CDNS_UART_MR_PARITY_SPACE;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700790 } else {
791 if (termios->c_cflag & PARODD)
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700792 cval |= CDNS_UART_MR_PARITY_ODD;
John Linn61ec9012011-04-30 00:07:43 -0400793 else
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700794 cval |= CDNS_UART_MR_PARITY_EVEN;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700795 }
796 } else {
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700797 cval |= CDNS_UART_MR_PARITY_NONE;
Soren Brinkmanne6b39bf2013-10-17 14:08:10 -0700798 }
799 cval |= mode_reg & 1;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800800 writel(cval, port->membase + CDNS_UART_MR);
John Linn61ec9012011-04-30 00:07:43 -0400801
Maarten Brock6d8bf782019-11-25 18:45:30 +0530802 cval = readl(port->membase + CDNS_UART_MODEMCR);
803 if (termios->c_cflag & CRTSCTS)
804 cval |= CDNS_UART_MODEMCR_FCM;
805 else
806 cval &= ~CDNS_UART_MODEMCR_FCM;
807 writel(cval, port->membase + CDNS_UART_MODEMCR);
808
John Linn61ec9012011-04-30 00:07:43 -0400809 spin_unlock_irqrestore(&port->lock, flags);
810}
811
812/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700813 * cdns_uart_startup - Called when an application opens a cdns_uart port
John Linn61ec9012011-04-30 00:07:43 -0400814 * @port: Handle to the uart port structure
815 *
Soren Brinkmanne555a212014-04-04 17:23:39 -0700816 * Return: 0 on success, negative errno otherwise
Michal Simek489810a12014-04-04 17:23:37 -0700817 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700818static int cdns_uart_startup(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400819{
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530820 struct cdns_uart *cdns_uart = port->private_data;
821 bool is_brk_support;
Soren Brinkmann55861d12016-01-11 17:41:36 -0800822 int ret;
Soren Brinkmann6e14f7c2015-12-26 02:43:53 -0800823 unsigned long flags;
Soren Brinkmann55861d12016-01-11 17:41:36 -0800824 unsigned int status = 0;
John Linn61ec9012011-04-30 00:07:43 -0400825
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530826 is_brk_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT;
827
Soren Brinkmann6e14f7c2015-12-26 02:43:53 -0800828 spin_lock_irqsave(&port->lock, flags);
829
John Linn61ec9012011-04-30 00:07:43 -0400830 /* Disable the TX and RX */
Thomas Betker19f22ef2015-03-12 22:11:59 +0100831 writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800832 port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400833
834 /* Set the Control Register with TX/RX Enable, TX/RX Reset,
835 * no break chars.
836 */
Thomas Betker19f22ef2015-03-12 22:11:59 +0100837 writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST,
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800838 port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400839
Nava kishore Manne27b17ae2016-09-15 14:45:31 +0530840 while (readl(port->membase + CDNS_UART_CR) &
841 (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
842 cpu_relax();
843
Soren Brinkmann6e14f7c2015-12-26 02:43:53 -0800844 /*
845 * Clear the RX disable bit and then set the RX enable bit to enable
846 * the receiver.
John Linn61ec9012011-04-30 00:07:43 -0400847 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800848 status = readl(port->membase + CDNS_UART_CR);
Helmut Grohne68d12bb2018-06-04 12:22:05 +0200849 status &= ~CDNS_UART_CR_RX_DIS;
Soren Brinkmann6e14f7c2015-12-26 02:43:53 -0800850 status |= CDNS_UART_CR_RX_EN;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800851 writel(status, port->membase + CDNS_UART_CR);
John Linn61ec9012011-04-30 00:07:43 -0400852
853 /* Set the Mode Register with normal mode,8 data bits,1 stop bit,
854 * no parity.
855 */
Thomas Betker19f22ef2015-03-12 22:11:59 +0100856 writel(CDNS_UART_MR_CHMODE_NORM | CDNS_UART_MR_STOPMODE_1_BIT
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700857 | CDNS_UART_MR_PARITY_NONE | CDNS_UART_MR_CHARLEN_8_BIT,
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800858 port->membase + CDNS_UART_MR);
John Linn61ec9012011-04-30 00:07:43 -0400859
Suneel85baf542013-10-17 14:08:08 -0700860 /*
861 * Set the RX FIFO Trigger level to use most of the FIFO, but it
862 * can be tuned with a module parameter
863 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800864 writel(rx_trigger_level, port->membase + CDNS_UART_RXWM);
John Linn61ec9012011-04-30 00:07:43 -0400865
Suneel85baf542013-10-17 14:08:08 -0700866 /*
867 * Receive Timeout register is enabled but it
868 * can be tuned with a module parameter
869 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800870 writel(rx_timeout, port->membase + CDNS_UART_RXTOUT);
John Linn61ec9012011-04-30 00:07:43 -0400871
John Linn855f6fd2013-03-22 18:49:27 +0100872 /* Clear out any pending interrupts before enabling them */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800873 writel(readl(port->membase + CDNS_UART_ISR),
874 port->membase + CDNS_UART_ISR);
John Linn61ec9012011-04-30 00:07:43 -0400875
Soren Brinkmann55861d12016-01-11 17:41:36 -0800876 spin_unlock_irqrestore(&port->lock, flags);
877
878 ret = request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME, port);
879 if (ret) {
880 dev_err(port->dev, "request_irq '%d' failed with %d\n",
881 port->irq, ret);
882 return ret;
883 }
884
John Linn61ec9012011-04-30 00:07:43 -0400885 /* Set the Interrupt Registers with desired interrupts */
Nava kishore Manne3816b2f82016-09-15 14:45:29 +0530886 if (is_brk_support)
887 writel(CDNS_UART_RX_IRQS | CDNS_UART_IXR_BRK,
888 port->membase + CDNS_UART_IER);
889 else
890 writel(CDNS_UART_RX_IRQS, port->membase + CDNS_UART_IER);
John Linn61ec9012011-04-30 00:07:43 -0400891
Soren Brinkmann55861d12016-01-11 17:41:36 -0800892 return 0;
John Linn61ec9012011-04-30 00:07:43 -0400893}
894
895/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700896 * cdns_uart_shutdown - Called when an application closes a cdns_uart port
John Linn61ec9012011-04-30 00:07:43 -0400897 * @port: Handle to the uart port structure
Michal Simek489810a12014-04-04 17:23:37 -0700898 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700899static void cdns_uart_shutdown(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400900{
901 int status;
Soren Brinkmanna19eda02015-12-26 02:43:55 -0800902 unsigned long flags;
903
904 spin_lock_irqsave(&port->lock, flags);
John Linn61ec9012011-04-30 00:07:43 -0400905
906 /* Disable interrupts */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800907 status = readl(port->membase + CDNS_UART_IMR);
908 writel(status, port->membase + CDNS_UART_IDR);
909 writel(0xffffffff, port->membase + CDNS_UART_ISR);
John Linn61ec9012011-04-30 00:07:43 -0400910
911 /* Disable the TX and RX */
Thomas Betker19f22ef2015-03-12 22:11:59 +0100912 writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
Soren Brinkmanna8df6a52016-01-11 17:41:40 -0800913 port->membase + CDNS_UART_CR);
Soren Brinkmanna19eda02015-12-26 02:43:55 -0800914
915 spin_unlock_irqrestore(&port->lock, flags);
916
John Linn61ec9012011-04-30 00:07:43 -0400917 free_irq(port->irq, port);
918}
919
920/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700921 * cdns_uart_type - Set UART type to cdns_uart port
John Linn61ec9012011-04-30 00:07:43 -0400922 * @port: Handle to the uart port structure
923 *
Michal Simek489810a12014-04-04 17:23:37 -0700924 * Return: string on success, NULL otherwise
925 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700926static const char *cdns_uart_type(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400927{
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700928 return port->type == PORT_XUARTPS ? CDNS_UART_NAME : NULL;
John Linn61ec9012011-04-30 00:07:43 -0400929}
930
931/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700932 * cdns_uart_verify_port - Verify the port params
John Linn61ec9012011-04-30 00:07:43 -0400933 * @port: Handle to the uart port structure
934 * @ser: Handle to the structure whose members are compared
935 *
Soren Brinkmanne555a212014-04-04 17:23:39 -0700936 * Return: 0 on success, negative errno otherwise.
Michal Simek489810a12014-04-04 17:23:37 -0700937 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700938static int cdns_uart_verify_port(struct uart_port *port,
John Linn61ec9012011-04-30 00:07:43 -0400939 struct serial_struct *ser)
940{
941 if (ser->type != PORT_UNKNOWN && ser->type != PORT_XUARTPS)
942 return -EINVAL;
943 if (port->irq != ser->irq)
944 return -EINVAL;
945 if (ser->io_type != UPIO_MEM)
946 return -EINVAL;
947 if (port->iobase != ser->port)
948 return -EINVAL;
949 if (ser->hub6 != 0)
950 return -EINVAL;
951 return 0;
952}
953
954/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700955 * cdns_uart_request_port - Claim the memory region attached to cdns_uart port,
956 * called when the driver adds a cdns_uart port via
John Linn61ec9012011-04-30 00:07:43 -0400957 * uart_add_one_port()
958 * @port: Handle to the uart port structure
959 *
Soren Brinkmanne555a212014-04-04 17:23:39 -0700960 * Return: 0 on success, negative errno otherwise.
Michal Simek489810a12014-04-04 17:23:37 -0700961 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700962static int cdns_uart_request_port(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400963{
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700964 if (!request_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE,
965 CDNS_UART_NAME)) {
John Linn61ec9012011-04-30 00:07:43 -0400966 return -ENOMEM;
967 }
968
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700969 port->membase = ioremap(port->mapbase, CDNS_UART_REGISTER_SPACE);
John Linn61ec9012011-04-30 00:07:43 -0400970 if (!port->membase) {
971 dev_err(port->dev, "Unable to map registers\n");
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700972 release_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE);
John Linn61ec9012011-04-30 00:07:43 -0400973 return -ENOMEM;
974 }
975 return 0;
976}
977
978/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700979 * cdns_uart_release_port - Release UART port
John Linn61ec9012011-04-30 00:07:43 -0400980 * @port: Handle to the uart port structure
Soren Brinkmanne555a212014-04-04 17:23:39 -0700981 *
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700982 * Release the memory region attached to a cdns_uart port. Called when the
983 * driver removes a cdns_uart port via uart_remove_one_port().
Michal Simek489810a12014-04-04 17:23:37 -0700984 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700985static void cdns_uart_release_port(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -0400986{
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700987 release_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE);
John Linn61ec9012011-04-30 00:07:43 -0400988 iounmap(port->membase);
989 port->membase = NULL;
990}
991
992/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700993 * cdns_uart_config_port - Configure UART port
John Linn61ec9012011-04-30 00:07:43 -0400994 * @port: Handle to the uart port structure
995 * @flags: If any
Michal Simek489810a12014-04-04 17:23:37 -0700996 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700997static void cdns_uart_config_port(struct uart_port *port, int flags)
John Linn61ec9012011-04-30 00:07:43 -0400998{
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -0700999 if (flags & UART_CONFIG_TYPE && cdns_uart_request_port(port) == 0)
John Linn61ec9012011-04-30 00:07:43 -04001000 port->type = PORT_XUARTPS;
1001}
1002
1003/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001004 * cdns_uart_get_mctrl - Get the modem control state
John Linn61ec9012011-04-30 00:07:43 -04001005 * @port: Handle to the uart port structure
1006 *
Michal Simek489810a12014-04-04 17:23:37 -07001007 * Return: the modem control state
1008 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001009static unsigned int cdns_uart_get_mctrl(struct uart_port *port)
John Linn61ec9012011-04-30 00:07:43 -04001010{
Maarten Brock422c6d32019-11-25 18:45:29 +05301011 u32 val;
1012 unsigned int mctrl = 0;
Shubhrajyoti Datta18631782019-04-09 13:15:24 +05301013 struct cdns_uart *cdns_uart_data = port->private_data;
1014
1015 if (cdns_uart_data->cts_override)
Maarten Brock422c6d32019-11-25 18:45:29 +05301016 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
Shubhrajyoti Datta18631782019-04-09 13:15:24 +05301017
Maarten Brock422c6d32019-11-25 18:45:29 +05301018 val = readl(port->membase + CDNS_UART_MODEMSR);
1019 if (val & CDNS_UART_MODEMSR_CTS)
1020 mctrl |= TIOCM_CTS;
1021 if (val & CDNS_UART_MODEMSR_DSR)
1022 mctrl |= TIOCM_DSR;
1023 if (val & CDNS_UART_MODEMSR_RI)
1024 mctrl |= TIOCM_RNG;
1025 if (val & CDNS_UART_MODEMSR_DCD)
1026 mctrl |= TIOCM_CAR;
1027
1028 return mctrl;
John Linn61ec9012011-04-30 00:07:43 -04001029}
1030
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001031static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
John Linn61ec9012011-04-30 00:07:43 -04001032{
Lars-Peter Clausen19038ad2014-11-05 13:35:16 +01001033 u32 val;
Yasir-Khan5935a2b2017-01-23 13:26:08 +01001034 u32 mode_reg;
Shubhrajyoti Datta18631782019-04-09 13:15:24 +05301035 struct cdns_uart *cdns_uart_data = port->private_data;
1036
1037 if (cdns_uart_data->cts_override)
1038 return;
Lars-Peter Clausen19038ad2014-11-05 13:35:16 +01001039
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001040 val = readl(port->membase + CDNS_UART_MODEMCR);
Yasir-Khan5935a2b2017-01-23 13:26:08 +01001041 mode_reg = readl(port->membase + CDNS_UART_MR);
Lars-Peter Clausen19038ad2014-11-05 13:35:16 +01001042
Maarten Brock6d8bf782019-11-25 18:45:30 +05301043 val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR);
Yasir-Khan5935a2b2017-01-23 13:26:08 +01001044 mode_reg &= ~CDNS_UART_MR_CHMODE_MASK;
Lars-Peter Clausen19038ad2014-11-05 13:35:16 +01001045
Maarten Brock1d3c2ea2019-11-25 18:45:31 +05301046 if (mctrl & TIOCM_RTS)
1047 val |= CDNS_UART_MODEMCR_RTS;
1048 if (mctrl & TIOCM_DTR)
1049 val |= CDNS_UART_MODEMCR_DTR;
Yasir-Khan5935a2b2017-01-23 13:26:08 +01001050 if (mctrl & TIOCM_LOOP)
1051 mode_reg |= CDNS_UART_MR_CHMODE_L_LOOP;
1052 else
1053 mode_reg |= CDNS_UART_MR_CHMODE_NORM;
Lars-Peter Clausen19038ad2014-11-05 13:35:16 +01001054
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001055 writel(val, port->membase + CDNS_UART_MODEMCR);
Yasir-Khan5935a2b2017-01-23 13:26:08 +01001056 writel(mode_reg, port->membase + CDNS_UART_MR);
John Linn61ec9012011-04-30 00:07:43 -04001057}
1058
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001059#ifdef CONFIG_CONSOLE_POLL
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001060static int cdns_uart_poll_get_char(struct uart_port *port)
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001061{
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001062 int c;
Soren Brinkmannf0f54a82015-12-26 02:43:50 -08001063 unsigned long flags;
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001064
Soren Brinkmannf0f54a82015-12-26 02:43:50 -08001065 spin_lock_irqsave(&port->lock, flags);
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001066
1067 /* Check if FIFO is empty */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001068 if (readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_RXEMPTY)
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001069 c = NO_POLL_CHAR;
1070 else /* Read a character */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001071 c = (unsigned char) readl(port->membase + CDNS_UART_FIFO);
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001072
Soren Brinkmannf0f54a82015-12-26 02:43:50 -08001073 spin_unlock_irqrestore(&port->lock, flags);
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001074
1075 return c;
1076}
1077
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001078static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001079{
Soren Brinkmannf0f54a82015-12-26 02:43:50 -08001080 unsigned long flags;
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001081
Soren Brinkmannf0f54a82015-12-26 02:43:50 -08001082 spin_lock_irqsave(&port->lock, flags);
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001083
1084 /* Wait until FIFO is empty */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001085 while (!(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXEMPTY))
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001086 cpu_relax();
1087
1088 /* Write a character */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001089 writel(c, port->membase + CDNS_UART_FIFO);
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001090
1091 /* Wait until FIFO is empty */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001092 while (!(readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXEMPTY))
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001093 cpu_relax();
1094
Soren Brinkmannf0f54a82015-12-26 02:43:50 -08001095 spin_unlock_irqrestore(&port->lock, flags);
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001096}
1097#endif
1098
Shubhrajyoti Datta210417c2016-05-27 15:05:19 +05301099static void cdns_uart_pm(struct uart_port *port, unsigned int state,
1100 unsigned int oldstate)
1101{
Shubhrajyoti Datta210417c2016-05-27 15:05:19 +05301102 switch (state) {
1103 case UART_PM_STATE_OFF:
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301104 pm_runtime_mark_last_busy(port->dev);
1105 pm_runtime_put_autosuspend(port->dev);
Shubhrajyoti Datta210417c2016-05-27 15:05:19 +05301106 break;
1107 default:
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301108 pm_runtime_get_sync(port->dev);
Shubhrajyoti Datta210417c2016-05-27 15:05:19 +05301109 break;
1110 }
1111}
1112
Julia Lawallf098a0a2016-09-01 19:51:36 +02001113static const struct uart_ops cdns_uart_ops = {
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001114 .set_mctrl = cdns_uart_set_mctrl,
1115 .get_mctrl = cdns_uart_get_mctrl,
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001116 .start_tx = cdns_uart_start_tx,
1117 .stop_tx = cdns_uart_stop_tx,
1118 .stop_rx = cdns_uart_stop_rx,
1119 .tx_empty = cdns_uart_tx_empty,
1120 .break_ctl = cdns_uart_break_ctl,
1121 .set_termios = cdns_uart_set_termios,
1122 .startup = cdns_uart_startup,
1123 .shutdown = cdns_uart_shutdown,
Shubhrajyoti Datta210417c2016-05-27 15:05:19 +05301124 .pm = cdns_uart_pm,
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001125 .type = cdns_uart_type,
1126 .verify_port = cdns_uart_verify_port,
1127 .request_port = cdns_uart_request_port,
1128 .release_port = cdns_uart_release_port,
1129 .config_port = cdns_uart_config_port,
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001130#ifdef CONFIG_CONSOLE_POLL
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001131 .poll_get_char = cdns_uart_poll_get_char,
1132 .poll_put_char = cdns_uart_poll_put_char,
Vlad Lungu6ee04c62013-10-17 14:08:07 -07001133#endif
John Linn61ec9012011-04-30 00:07:43 -04001134};
1135
Michal Simek18cc7ac82020-04-03 11:24:36 +02001136static struct uart_driver cdns_uart_uart_driver;
1137
John Linn61ec9012011-04-30 00:07:43 -04001138#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
1139/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001140 * cdns_uart_console_putchar - write the character to the FIFO buffer
John Linn61ec9012011-04-30 00:07:43 -04001141 * @port: Handle to the uart port structure
1142 * @ch: Character to be written
Michal Simek489810a12014-04-04 17:23:37 -07001143 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001144static void cdns_uart_console_putchar(struct uart_port *port, int ch)
John Linn61ec9012011-04-30 00:07:43 -04001145{
Helmut Grohnede4ed392018-06-04 12:22:11 +02001146 while (readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)
1147 cpu_relax();
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001148 writel(ch, port->membase + CDNS_UART_FIFO);
John Linn61ec9012011-04-30 00:07:43 -04001149}
1150
Jeffy Chen99d273162017-07-18 14:02:56 +08001151static void cdns_early_write(struct console *con, const char *s,
Jinchao Wang5607fa62021-06-24 10:12:07 +08001152 unsigned int n)
Michal Simek6fa62fc2014-09-10 12:43:02 +02001153{
1154 struct earlycon_device *dev = con->data;
1155
1156 uart_console_write(&dev->port, s, n, cdns_uart_console_putchar);
1157}
1158
1159static int __init cdns_early_console_setup(struct earlycon_device *device,
1160 const char *opt)
1161{
Scott Telfordc41251b2016-09-22 16:58:16 +01001162 struct uart_port *port = &device->port;
1163
1164 if (!port->membase)
Michal Simek6fa62fc2014-09-10 12:43:02 +02001165 return -ENODEV;
1166
Scott Telfordc41251b2016-09-22 16:58:16 +01001167 /* initialise control register */
1168 writel(CDNS_UART_CR_TX_EN|CDNS_UART_CR_TXRST|CDNS_UART_CR_RXRST,
1169 port->membase + CDNS_UART_CR);
1170
1171 /* only set baud if specified on command line - otherwise
1172 * assume it has been initialized by a boot loader.
1173 */
Michal Simek66dd99c2018-04-23 10:55:21 +02001174 if (port->uartclk && device->baud) {
Scott Telfordc41251b2016-09-22 16:58:16 +01001175 u32 cd = 0, bdiv = 0;
1176 u32 mr;
1177 int div8;
1178
1179 cdns_uart_calc_baud_divs(port->uartclk, device->baud,
1180 &bdiv, &cd, &div8);
1181 mr = CDNS_UART_MR_PARITY_NONE;
1182 if (div8)
1183 mr |= CDNS_UART_MR_CLKSEL;
1184
1185 writel(mr, port->membase + CDNS_UART_MR);
1186 writel(cd, port->membase + CDNS_UART_BAUDGEN);
1187 writel(bdiv, port->membase + CDNS_UART_BAUDDIV);
1188 }
1189
Michal Simek6fa62fc2014-09-10 12:43:02 +02001190 device->con->write = cdns_early_write;
1191
1192 return 0;
1193}
Michal Simek93d7bba2016-02-18 08:57:20 +01001194OF_EARLYCON_DECLARE(cdns, "xlnx,xuartps", cdns_early_console_setup);
1195OF_EARLYCON_DECLARE(cdns, "cdns,uart-r1p8", cdns_early_console_setup);
1196OF_EARLYCON_DECLARE(cdns, "cdns,uart-r1p12", cdns_early_console_setup);
Nava kishore Manne0267a4f2016-10-12 13:17:27 +05301197OF_EARLYCON_DECLARE(cdns, "xlnx,zynqmp-uart", cdns_early_console_setup);
Michal Simek6fa62fc2014-09-10 12:43:02 +02001198
Michal Simek0413fe02018-04-23 11:51:01 +02001199
1200/* Static pointer to console port */
1201static struct uart_port *console_port;
1202
John Linn61ec9012011-04-30 00:07:43 -04001203/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001204 * cdns_uart_console_write - perform write operation
Michal Simek489810a12014-04-04 17:23:37 -07001205 * @co: Console handle
John Linn61ec9012011-04-30 00:07:43 -04001206 * @s: Pointer to character array
1207 * @count: No of characters
Michal Simek489810a12014-04-04 17:23:37 -07001208 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001209static void cdns_uart_console_write(struct console *co, const char *s,
John Linn61ec9012011-04-30 00:07:43 -04001210 unsigned int count)
1211{
Michal Simek0413fe02018-04-23 11:51:01 +02001212 struct uart_port *port = console_port;
Johan Hovold18ee37e2021-05-19 11:25:41 +02001213 unsigned long flags;
Lars-Peter Clausend3755f52013-10-17 14:08:09 -07001214 unsigned int imr, ctrl;
John Linn61ec9012011-04-30 00:07:43 -04001215 int locked = 1;
1216
Soren Brinkmann74ea66d42016-01-11 17:41:39 -08001217 if (port->sysrq)
1218 locked = 0;
1219 else if (oops_in_progress)
John Linn61ec9012011-04-30 00:07:43 -04001220 locked = spin_trylock_irqsave(&port->lock, flags);
1221 else
1222 spin_lock_irqsave(&port->lock, flags);
1223
1224 /* save and disable interrupt */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001225 imr = readl(port->membase + CDNS_UART_IMR);
1226 writel(imr, port->membase + CDNS_UART_IDR);
John Linn61ec9012011-04-30 00:07:43 -04001227
Lars-Peter Clausend3755f52013-10-17 14:08:09 -07001228 /*
1229 * Make sure that the tx part is enabled. Set the TX enable bit and
1230 * clear the TX disable bit to enable the transmitter.
1231 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001232 ctrl = readl(port->membase + CDNS_UART_CR);
Soren Brinkmanne3538c32015-12-26 02:43:49 -08001233 ctrl &= ~CDNS_UART_CR_TX_DIS;
1234 ctrl |= CDNS_UART_CR_TX_EN;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001235 writel(ctrl, port->membase + CDNS_UART_CR);
Lars-Peter Clausend3755f52013-10-17 14:08:09 -07001236
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001237 uart_console_write(port, s, count, cdns_uart_console_putchar);
Raviteja Narayanama8e73462020-04-09 11:56:03 +05301238 while (cdns_uart_tx_empty(port) != TIOCSER_TEMT)
Helmut Grohnede4ed392018-06-04 12:22:11 +02001239 cpu_relax();
John Linn61ec9012011-04-30 00:07:43 -04001240
Soren Brinkmannb494a5f2014-04-04 17:23:42 -07001241 /* restore interrupt state */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001242 writel(imr, port->membase + CDNS_UART_IER);
John Linn61ec9012011-04-30 00:07:43 -04001243
1244 if (locked)
1245 spin_unlock_irqrestore(&port->lock, flags);
1246}
1247
1248/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001249 * cdns_uart_console_setup - Initialize the uart to default config
John Linn61ec9012011-04-30 00:07:43 -04001250 * @co: Console handle
1251 * @options: Initial settings of uart
1252 *
Soren Brinkmanne555a212014-04-04 17:23:39 -07001253 * Return: 0 on success, negative errno otherwise.
Michal Simek489810a12014-04-04 17:23:37 -07001254 */
Michal Simek4bb1ce22018-09-03 15:10:49 +02001255static int cdns_uart_console_setup(struct console *co, char *options)
John Linn61ec9012011-04-30 00:07:43 -04001256{
Michal Simek0413fe02018-04-23 11:51:01 +02001257 struct uart_port *port = console_port;
1258
John Linn61ec9012011-04-30 00:07:43 -04001259 int baud = 9600;
1260 int bits = 8;
1261 int parity = 'n';
1262 int flow = 'n';
Raviteja Narayanam42e11942020-04-09 11:56:02 +05301263 unsigned long time_out;
John Linn61ec9012011-04-30 00:07:43 -04001264
Thomas Betker136debf2015-03-11 22:39:28 +01001265 if (!port->membase) {
Peter Crosthwaitef6415492015-02-24 15:13:57 -08001266 pr_debug("console on " CDNS_UART_TTY_NAME "%i not present\n",
1267 co->index);
John Linn61ec9012011-04-30 00:07:43 -04001268 return -ENODEV;
1269 }
1270
1271 if (options)
1272 uart_parse_options(options, &baud, &parity, &bits, &flow);
1273
Raviteja Narayanam42e11942020-04-09 11:56:02 +05301274 /* Wait for tx_empty before setting up the console */
1275 time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
1276
1277 while (time_before(jiffies, time_out) &&
1278 cdns_uart_tx_empty(port) != TIOCSER_TEMT)
1279 cpu_relax();
1280
John Linn61ec9012011-04-30 00:07:43 -04001281 return uart_set_options(port, co, baud, parity, bits, flow);
1282}
Michal Simek18cc7ac82020-04-03 11:24:36 +02001283
1284static struct console cdns_uart_console = {
1285 .name = CDNS_UART_TTY_NAME,
1286 .write = cdns_uart_console_write,
1287 .device = uart_console_device,
1288 .setup = cdns_uart_console_setup,
1289 .flags = CON_PRINTBUFFER,
1290 .index = -1, /* Specified on the cmdline (e.g. console=ttyPS ) */
1291 .data = &cdns_uart_uart_driver,
1292};
John Linn61ec9012011-04-30 00:07:43 -04001293#endif /* CONFIG_SERIAL_XILINX_PS_UART_CONSOLE */
1294
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001295#ifdef CONFIG_PM_SLEEP
1296/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001297 * cdns_uart_suspend - suspend event
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001298 * @device: Pointer to the device structure
1299 *
Michal Simek489810a12014-04-04 17:23:37 -07001300 * Return: 0
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001301 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001302static int cdns_uart_suspend(struct device *device)
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001303{
1304 struct uart_port *port = dev_get_drvdata(device);
Michal Simek46a460f2018-09-03 15:10:52 +02001305 struct cdns_uart *cdns_uart = port->private_data;
Nava kishore Manne4b9d33c2018-09-03 15:10:51 +02001306 int may_wake;
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001307
Nava kishore Manne4b9d33c2018-09-03 15:10:51 +02001308 may_wake = device_may_wakeup(device);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001309
Shubhrajyoti Datta82b1b2e2018-12-18 13:18:40 +01001310 if (console_suspend_enabled && uart_console(port) && may_wake) {
Johan Hovold18ee37e2021-05-19 11:25:41 +02001311 unsigned long flags;
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001312
1313 spin_lock_irqsave(&port->lock, flags);
1314 /* Empty the receive FIFO 1st before making changes */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001315 while (!(readl(port->membase + CDNS_UART_SR) &
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001316 CDNS_UART_SR_RXEMPTY))
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001317 readl(port->membase + CDNS_UART_FIFO);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001318 /* set RX trigger level to 1 */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001319 writel(1, port->membase + CDNS_UART_RXWM);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001320 /* disable RX timeout interrups */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001321 writel(CDNS_UART_IXR_TOUT, port->membase + CDNS_UART_IDR);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001322 spin_unlock_irqrestore(&port->lock, flags);
1323 }
1324
Nava kishore Manne4b9d33c2018-09-03 15:10:51 +02001325 /*
1326 * Call the API provided in serial_core.c file which handles
1327 * the suspend.
1328 */
Michal Simek46a460f2018-09-03 15:10:52 +02001329 return uart_suspend_port(cdns_uart->cdns_uart_driver, port);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001330}
1331
1332/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001333 * cdns_uart_resume - Resume after a previous suspend
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001334 * @device: Pointer to the device structure
1335 *
Michal Simek489810a12014-04-04 17:23:37 -07001336 * Return: 0
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001337 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001338static int cdns_uart_resume(struct device *device)
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001339{
1340 struct uart_port *port = dev_get_drvdata(device);
Michal Simek46a460f2018-09-03 15:10:52 +02001341 struct cdns_uart *cdns_uart = port->private_data;
Johan Hovold18ee37e2021-05-19 11:25:41 +02001342 unsigned long flags;
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001343 u32 ctrl_reg;
Nava kishore Manne4b9d33c2018-09-03 15:10:51 +02001344 int may_wake;
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001345
Nava kishore Manne4b9d33c2018-09-03 15:10:51 +02001346 may_wake = device_may_wakeup(device);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001347
Shubhrajyoti Datta82b1b2e2018-12-18 13:18:40 +01001348 if (console_suspend_enabled && uart_console(port) && !may_wake) {
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001349 clk_enable(cdns_uart->pclk);
1350 clk_enable(cdns_uart->uartclk);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001351
1352 spin_lock_irqsave(&port->lock, flags);
1353
1354 /* Set TX/RX Reset */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001355 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001356 ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001357 writel(ctrl_reg, port->membase + CDNS_UART_CR);
1358 while (readl(port->membase + CDNS_UART_CR) &
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001359 (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001360 cpu_relax();
1361
1362 /* restore rx timeout value */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001363 writel(rx_timeout, port->membase + CDNS_UART_RXTOUT);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001364 /* Enable Tx/Rx */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001365 ctrl_reg = readl(port->membase + CDNS_UART_CR);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001366 ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
1367 ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001368 writel(ctrl_reg, port->membase + CDNS_UART_CR);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001369
Shubhrajyoti Datta81e33b52017-03-15 08:38:56 -07001370 clk_disable(cdns_uart->uartclk);
1371 clk_disable(cdns_uart->pclk);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001372 spin_unlock_irqrestore(&port->lock, flags);
1373 } else {
1374 spin_lock_irqsave(&port->lock, flags);
1375 /* restore original rx trigger level */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001376 writel(rx_trigger_level, port->membase + CDNS_UART_RXWM);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001377 /* enable RX timeout interrupt */
Soren Brinkmanna8df6a52016-01-11 17:41:40 -08001378 writel(CDNS_UART_IXR_TOUT, port->membase + CDNS_UART_IER);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001379 spin_unlock_irqrestore(&port->lock, flags);
1380 }
1381
Michal Simek46a460f2018-09-03 15:10:52 +02001382 return uart_resume_port(cdns_uart->cdns_uart_driver, port);
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001383}
1384#endif /* ! CONFIG_PM_SLEEP */
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301385static int __maybe_unused cdns_runtime_suspend(struct device *dev)
1386{
Wolfram Sanga406c4b2018-04-19 16:06:23 +02001387 struct uart_port *port = dev_get_drvdata(dev);
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301388 struct cdns_uart *cdns_uart = port->private_data;
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001389
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301390 clk_disable(cdns_uart->uartclk);
1391 clk_disable(cdns_uart->pclk);
1392 return 0;
1393};
1394
1395static int __maybe_unused cdns_runtime_resume(struct device *dev)
1396{
Wolfram Sanga406c4b2018-04-19 16:06:23 +02001397 struct uart_port *port = dev_get_drvdata(dev);
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301398 struct cdns_uart *cdns_uart = port->private_data;
1399
1400 clk_enable(cdns_uart->pclk);
1401 clk_enable(cdns_uart->uartclk);
1402 return 0;
1403};
1404
1405static const struct dev_pm_ops cdns_uart_dev_pm_ops = {
1406 SET_SYSTEM_SLEEP_PM_OPS(cdns_uart_suspend, cdns_uart_resume)
1407 SET_RUNTIME_PM_OPS(cdns_runtime_suspend,
1408 cdns_runtime_resume, NULL)
1409};
Soren Brinkmann4b47d9a2013-10-17 14:08:12 -07001410
Nava kishore Manne3816b2f82016-09-15 14:45:29 +05301411static const struct cdns_platform_data zynqmp_uart_def = {
1412 .quirks = CDNS_UART_RXBS_SUPPORT, };
1413
1414/* Match table for of_platform binding */
1415static const struct of_device_id cdns_uart_of_match[] = {
1416 { .compatible = "xlnx,xuartps", },
1417 { .compatible = "cdns,uart-r1p8", },
1418 { .compatible = "cdns,uart-r1p12", .data = &zynqmp_uart_def },
Nava kishore Manne0267a4f2016-10-12 13:17:27 +05301419 { .compatible = "xlnx,zynqmp-uart", .data = &zynqmp_uart_def },
Nava kishore Manne3816b2f82016-09-15 14:45:29 +05301420 {}
1421};
1422MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
1423
Michal Simek18cc7ac82020-04-03 11:24:36 +02001424/* Temporary variable for storing number of instances */
1425static int instances;
Michal Simekae1cca32018-09-20 13:41:53 +02001426
John Linn61ec9012011-04-30 00:07:43 -04001427/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001428 * cdns_uart_probe - Platform driver probe
John Linn61ec9012011-04-30 00:07:43 -04001429 * @pdev: Pointer to the platform device structure
1430 *
Soren Brinkmanne555a212014-04-04 17:23:39 -07001431 * Return: 0 on success, negative errno otherwise
Michal Simek489810a12014-04-04 17:23:37 -07001432 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001433static int cdns_uart_probe(struct platform_device *pdev)
John Linn61ec9012011-04-30 00:07:43 -04001434{
Michal Simek492cc082020-04-03 11:24:35 +02001435 int rc, id, irq;
John Linn61ec9012011-04-30 00:07:43 -04001436 struct uart_port *port;
Michal Simek5c90c072015-04-13 16:34:21 +02001437 struct resource *res;
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001438 struct cdns_uart *cdns_uart_data;
Nava kishore Manne3816b2f82016-09-15 14:45:29 +05301439 const struct of_device_id *match;
John Linn61ec9012011-04-30 00:07:43 -04001440
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001441 cdns_uart_data = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_data),
Soren Brinkmannc03cae12013-10-17 14:08:05 -07001442 GFP_KERNEL);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001443 if (!cdns_uart_data)
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001444 return -ENOMEM;
Michal Simek0a84bae2018-04-23 11:51:03 +02001445 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
1446 if (!port)
1447 return -ENOMEM;
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001448
Michal Simek72d68192020-04-03 11:24:34 +02001449 /* Look for a serialN alias */
Michal Simek492cc082020-04-03 11:24:35 +02001450 id = of_alias_get_id(pdev->dev.of_node, "serial");
1451 if (id < 0)
1452 id = 0;
Michal Simek024ca322018-09-03 15:10:57 +02001453
Michal Simek492cc082020-04-03 11:24:35 +02001454 if (id >= CDNS_UART_NR_PORTS) {
Michal Simek72d68192020-04-03 11:24:34 +02001455 dev_err(&pdev->dev, "Cannot get uart_port structure\n");
1456 return -ENODEV;
Michal Simekae1cca32018-09-20 13:41:53 +02001457 }
Michal Simek024ca322018-09-03 15:10:57 +02001458
Michal Simek18cc7ac82020-04-03 11:24:36 +02001459 if (!cdns_uart_uart_driver.state) {
1460 cdns_uart_uart_driver.owner = THIS_MODULE;
1461 cdns_uart_uart_driver.driver_name = CDNS_UART_NAME;
1462 cdns_uart_uart_driver.dev_name = CDNS_UART_TTY_NAME;
1463 cdns_uart_uart_driver.major = CDNS_UART_MAJOR;
1464 cdns_uart_uart_driver.minor = CDNS_UART_MINOR;
1465 cdns_uart_uart_driver.nr = CDNS_UART_NR_PORTS;
Michal Simek10a53152018-09-03 15:10:55 +02001466#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
Michal Simek18cc7ac82020-04-03 11:24:36 +02001467 cdns_uart_uart_driver.cons = &cdns_uart_console;
Michal Simek10a53152018-09-03 15:10:55 +02001468#endif
1469
Michal Simek18cc7ac82020-04-03 11:24:36 +02001470 rc = uart_register_driver(&cdns_uart_uart_driver);
1471 if (rc < 0) {
1472 dev_err(&pdev->dev, "Failed to register driver\n");
1473 return rc;
1474 }
Michal Simeke4bbb512018-09-03 15:10:54 +02001475 }
1476
Michal Simek18cc7ac82020-04-03 11:24:36 +02001477 cdns_uart_data->cdns_uart_driver = &cdns_uart_uart_driver;
Michal Simek46a460f2018-09-03 15:10:52 +02001478
Nava kishore Manne3816b2f82016-09-15 14:45:29 +05301479 match = of_match_node(cdns_uart_of_match, pdev->dev.of_node);
1480 if (match && match->data) {
1481 const struct cdns_platform_data *data = match->data;
1482
1483 cdns_uart_data->quirks = data->quirks;
1484 }
1485
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001486 cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
Rajan Vajaf6949362019-03-01 01:37:08 -08001487 if (PTR_ERR(cdns_uart_data->pclk) == -EPROBE_DEFER) {
Greg Kroah-Hartman82ca0d542018-12-06 12:47:22 +01001488 rc = PTR_ERR(cdns_uart_data->pclk);
1489 goto err_out_unregister_driver;
Josh Cartwright2326669c2013-01-21 19:57:41 +01001490 }
1491
Rajan Vajaf6949362019-03-01 01:37:08 -08001492 if (IS_ERR(cdns_uart_data->pclk)) {
1493 cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
1494 if (IS_ERR(cdns_uart_data->pclk)) {
1495 rc = PTR_ERR(cdns_uart_data->pclk);
1496 goto err_out_unregister_driver;
1497 }
1498 dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
Greg Kroah-Hartman82ca0d542018-12-06 12:47:22 +01001499 }
Rajan Vajaf6949362019-03-01 01:37:08 -08001500
1501 cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
1502 if (PTR_ERR(cdns_uart_data->uartclk) == -EPROBE_DEFER) {
Greg Kroah-Hartman82ca0d542018-12-06 12:47:22 +01001503 rc = PTR_ERR(cdns_uart_data->uartclk);
1504 goto err_out_unregister_driver;
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001505 }
1506
Rajan Vajaf6949362019-03-01 01:37:08 -08001507 if (IS_ERR(cdns_uart_data->uartclk)) {
1508 cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "ref_clk");
1509 if (IS_ERR(cdns_uart_data->uartclk)) {
1510 rc = PTR_ERR(cdns_uart_data->uartclk);
1511 goto err_out_unregister_driver;
1512 }
1513 dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
1514 }
1515
Shubhrajyoti Dattaecfc5772017-04-06 12:27:41 +05301516 rc = clk_prepare_enable(cdns_uart_data->pclk);
Josh Cartwright2326669c2013-01-21 19:57:41 +01001517 if (rc) {
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001518 dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
Michal Simeke4bbb512018-09-03 15:10:54 +02001519 goto err_out_unregister_driver;
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001520 }
Shubhrajyoti Dattaecfc5772017-04-06 12:27:41 +05301521 rc = clk_prepare_enable(cdns_uart_data->uartclk);
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001522 if (rc) {
1523 dev_err(&pdev->dev, "Unable to enable device clock.\n");
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001524 goto err_out_clk_dis_pclk;
John Linn61ec9012011-04-30 00:07:43 -04001525 }
1526
1527 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001528 if (!res) {
1529 rc = -ENODEV;
1530 goto err_out_clk_disable;
1531 }
John Linn61ec9012011-04-30 00:07:43 -04001532
Michal Simek5c90c072015-04-13 16:34:21 +02001533 irq = platform_get_irq(pdev, 0);
1534 if (irq <= 0) {
1535 rc = -ENXIO;
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001536 goto err_out_clk_disable;
1537 }
John Linn61ec9012011-04-30 00:07:43 -04001538
Soren Brinkmann7ac57342013-10-21 16:41:01 -07001539#ifdef CONFIG_COMMON_CLK
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001540 cdns_uart_data->clk_rate_change_nb.notifier_call =
1541 cdns_uart_clk_notifier_cb;
1542 if (clk_notifier_register(cdns_uart_data->uartclk,
1543 &cdns_uart_data->clk_rate_change_nb))
Soren Brinkmannc4b05102013-10-17 14:08:11 -07001544 dev_warn(&pdev->dev, "Unable to register clock notifier.\n");
Soren Brinkmann7ac57342013-10-21 16:41:01 -07001545#endif
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001546
Michal Simek1f210722018-04-23 11:51:02 +02001547 /* At this point, we've got an empty uart_port struct, initialize it */
1548 spin_lock_init(&port->lock);
Michal Simek1f210722018-04-23 11:51:02 +02001549 port->type = PORT_UNKNOWN;
1550 port->iotype = UPIO_MEM32;
1551 port->flags = UPF_BOOT_AUTOCONF;
1552 port->ops = &cdns_uart_ops;
1553 port->fifosize = CDNS_UART_FIFO_SIZE;
Dmitry Safonovebaa8c62019-12-13 00:06:51 +00001554 port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_XILINX_PS_UART_CONSOLE);
Michal Simek18cc7ac82020-04-03 11:24:36 +02001555 port->line = id;
Michal Simek1f210722018-04-23 11:51:02 +02001556
Soren Brinkmann354fb1a2016-01-11 17:41:38 -08001557 /*
1558 * Register the port.
1559 * This function also registers this device with the tty layer
1560 * and triggers invocation of the config_port() entry point.
1561 */
1562 port->mapbase = res->start;
1563 port->irq = irq;
1564 port->dev = &pdev->dev;
1565 port->uartclk = clk_get_rate(cdns_uart_data->uartclk);
1566 port->private_data = cdns_uart_data;
1567 cdns_uart_data->port = port;
1568 platform_set_drvdata(pdev, port);
1569
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301570 pm_runtime_use_autosuspend(&pdev->dev);
1571 pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301572 pm_runtime_set_active(&pdev->dev);
Shubhrajyoti Dattaecfc5772017-04-06 12:27:41 +05301573 pm_runtime_enable(&pdev->dev);
Shubhrajyoti Datta86df8dd2018-12-18 13:18:39 +01001574 device_init_wakeup(port->dev, true);
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301575
Michal Simek0413fe02018-04-23 11:51:01 +02001576#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
1577 /*
1578 * If console hasn't been found yet try to assign this port
1579 * because it is required to be assigned for console setup function.
1580 * If register_console() don't assign value, then console_port pointer
1581 * is cleanup.
1582 */
Helmut Grohne22a82fa2020-07-13 09:32:28 +02001583 if (!console_port) {
1584 cdns_uart_console.index = id;
Michal Simek0413fe02018-04-23 11:51:01 +02001585 console_port = port;
Helmut Grohne22a82fa2020-07-13 09:32:28 +02001586 }
Michal Simek0413fe02018-04-23 11:51:01 +02001587#endif
1588
Michal Simek18cc7ac82020-04-03 11:24:36 +02001589 rc = uart_add_one_port(&cdns_uart_uart_driver, port);
Soren Brinkmann354fb1a2016-01-11 17:41:38 -08001590 if (rc) {
1591 dev_err(&pdev->dev,
1592 "uart_add_one_port() failed; err=%i\n", rc);
Shubhrajyoti Dattad653c432017-05-09 11:50:32 +05301593 goto err_out_pm_disable;
Soren Brinkmann354fb1a2016-01-11 17:41:38 -08001594 }
1595
Michal Simek0413fe02018-04-23 11:51:01 +02001596#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
1597 /* This is not port which is used for console that's why clean it up */
Michal Simek427c8ae2018-09-03 15:10:56 +02001598 if (console_port == port &&
Helmut Grohne22a82fa2020-07-13 09:32:28 +02001599 !(cdns_uart_uart_driver.cons->flags & CON_ENABLED)) {
Michal Simek0413fe02018-04-23 11:51:01 +02001600 console_port = NULL;
Helmut Grohne22a82fa2020-07-13 09:32:28 +02001601 cdns_uart_console.index = -1;
1602 }
Michal Simek0413fe02018-04-23 11:51:01 +02001603#endif
1604
Shubhrajyoti Datta18631782019-04-09 13:15:24 +05301605 cdns_uart_data->cts_override = of_property_read_bool(pdev->dev.of_node,
1606 "cts-override");
Michal Simek18cc7ac82020-04-03 11:24:36 +02001607
1608 instances++;
1609
Soren Brinkmann354fb1a2016-01-11 17:41:38 -08001610 return 0;
1611
Shubhrajyoti Dattad653c432017-05-09 11:50:32 +05301612err_out_pm_disable:
1613 pm_runtime_disable(&pdev->dev);
1614 pm_runtime_set_suspended(&pdev->dev);
1615 pm_runtime_dont_use_autosuspend(&pdev->dev);
Soren Brinkmann7ac57342013-10-21 16:41:01 -07001616#ifdef CONFIG_COMMON_CLK
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001617 clk_notifier_unregister(cdns_uart_data->uartclk,
1618 &cdns_uart_data->clk_rate_change_nb);
Soren Brinkmann7ac57342013-10-21 16:41:01 -07001619#endif
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001620err_out_clk_disable:
Shubhrajyoti Dattaecfc5772017-04-06 12:27:41 +05301621 clk_disable_unprepare(cdns_uart_data->uartclk);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001622err_out_clk_dis_pclk:
Shubhrajyoti Dattaecfc5772017-04-06 12:27:41 +05301623 clk_disable_unprepare(cdns_uart_data->pclk);
Michal Simeke4bbb512018-09-03 15:10:54 +02001624err_out_unregister_driver:
Michal Simek18cc7ac82020-04-03 11:24:36 +02001625 if (!instances)
1626 uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
Soren Brinkmann30e1e282013-05-13 10:46:38 -07001627 return rc;
John Linn61ec9012011-04-30 00:07:43 -04001628}
1629
1630/**
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001631 * cdns_uart_remove - called when the platform driver is unregistered
John Linn61ec9012011-04-30 00:07:43 -04001632 * @pdev: Pointer to the platform device structure
1633 *
Soren Brinkmanne555a212014-04-04 17:23:39 -07001634 * Return: 0 on success, negative errno otherwise
Michal Simek489810a12014-04-04 17:23:37 -07001635 */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001636static int cdns_uart_remove(struct platform_device *pdev)
John Linn61ec9012011-04-30 00:07:43 -04001637{
Jingoo Han696faed2013-05-23 19:39:36 +09001638 struct uart_port *port = platform_get_drvdata(pdev);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001639 struct cdns_uart *cdns_uart_data = port->private_data;
Josh Cartwright2326669c2013-01-21 19:57:41 +01001640 int rc;
John Linn61ec9012011-04-30 00:07:43 -04001641
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001642 /* Remove the cdns_uart port from the serial core */
Soren Brinkmann7ac57342013-10-21 16:41:01 -07001643#ifdef CONFIG_COMMON_CLK
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001644 clk_notifier_unregister(cdns_uart_data->uartclk,
1645 &cdns_uart_data->clk_rate_change_nb);
Soren Brinkmann7ac57342013-10-21 16:41:01 -07001646#endif
Michal Simek46a460f2018-09-03 15:10:52 +02001647 rc = uart_remove_one_port(cdns_uart_data->cdns_uart_driver, port);
Josh Cartwright2326669c2013-01-21 19:57:41 +01001648 port->mapbase = 0;
Shubhrajyoti Dattaecfc5772017-04-06 12:27:41 +05301649 clk_disable_unprepare(cdns_uart_data->uartclk);
1650 clk_disable_unprepare(cdns_uart_data->pclk);
Shubhrajyoti Dattad62100f2017-03-09 11:19:07 +05301651 pm_runtime_disable(&pdev->dev);
1652 pm_runtime_set_suspended(&pdev->dev);
1653 pm_runtime_dont_use_autosuspend(&pdev->dev);
Shubhrajyoti Datta86df8dd2018-12-18 13:18:39 +01001654 device_init_wakeup(&pdev->dev, false);
Michal Simek427c8ae2018-09-03 15:10:56 +02001655
1656#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
1657 if (console_port == port)
1658 console_port = NULL;
1659#endif
1660
Michal Simek18cc7ac82020-04-03 11:24:36 +02001661 if (!--instances)
1662 uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
John Linn61ec9012011-04-30 00:07:43 -04001663 return rc;
1664}
1665
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001666static struct platform_driver cdns_uart_platform_driver = {
1667 .probe = cdns_uart_probe,
1668 .remove = cdns_uart_remove,
John Linn61ec9012011-04-30 00:07:43 -04001669 .driver = {
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001670 .name = CDNS_UART_NAME,
1671 .of_match_table = cdns_uart_of_match,
1672 .pm = &cdns_uart_dev_pm_ops,
Anders Roxell64609792018-10-30 12:35:44 +01001673 .suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_XILINX_PS_UART),
John Linn61ec9012011-04-30 00:07:43 -04001674 },
1675};
1676
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001677static int __init cdns_uart_init(void)
John Linn61ec9012011-04-30 00:07:43 -04001678{
John Linn61ec9012011-04-30 00:07:43 -04001679 /* Register the platform driver */
Michal Simeke4bbb512018-09-03 15:10:54 +02001680 return platform_driver_register(&cdns_uart_platform_driver);
John Linn61ec9012011-04-30 00:07:43 -04001681}
1682
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001683static void __exit cdns_uart_exit(void)
John Linn61ec9012011-04-30 00:07:43 -04001684{
John Linn61ec9012011-04-30 00:07:43 -04001685 /* Unregister the platform driver */
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001686 platform_driver_unregister(&cdns_uart_platform_driver);
John Linn61ec9012011-04-30 00:07:43 -04001687}
1688
Shubhrajyoti Datta1d672432017-09-20 12:20:11 +05301689arch_initcall(cdns_uart_init);
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001690module_exit(cdns_uart_exit);
John Linn61ec9012011-04-30 00:07:43 -04001691
Soren Brinkmannd9bb3fb2014-04-04 17:23:43 -07001692MODULE_DESCRIPTION("Driver for Cadence UART");
John Linn61ec9012011-04-30 00:07:43 -04001693MODULE_AUTHOR("Xilinx Inc.");
1694MODULE_LICENSE("GPL");