Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 2 | /* |
| 3 | * TI DAVINCI I2C adapter driver. |
| 4 | * |
| 5 | * Copyright (C) 2006 Texas Instruments. |
| 6 | * Copyright (C) 2007 MontaVista Software Inc. |
| 7 | * |
| 8 | * Updated by Vinod & Sudhakar Feb 2005 |
| 9 | * |
| 10 | * ---------------------------------------------------------------------------- |
| 11 | * |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 12 | * ---------------------------------------------------------------------------- |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 13 | */ |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/i2c.h> |
| 18 | #include <linux/clk.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/err.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 26 | #include <linux/cpufreq.h> |
Linus Walleij | e535376 | 2017-12-20 13:17:49 +0100 | [diff] [blame] | 27 | #include <linux/gpio/consumer.h> |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 28 | #include <linux/of_device.h> |
Arnd Bergmann | ec2a083 | 2012-08-24 15:11:34 +0200 | [diff] [blame] | 29 | #include <linux/platform_data/i2c-davinci.h> |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 30 | #include <linux/pm_runtime.h> |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 31 | |
| 32 | /* ----- global defines ----------------------------------------------- */ |
| 33 | |
| 34 | #define DAVINCI_I2C_TIMEOUT (1*HZ) |
Philby John | 8574faf | 2010-01-11 22:39:44 +0530 | [diff] [blame] | 35 | #define DAVINCI_I2C_MAX_TRIES 2 |
Alexander Sverdlin | 41c8d45 | 2015-06-09 13:10:10 +0200 | [diff] [blame] | 36 | #define DAVINCI_I2C_OWN_ADDRESS 0x08 |
| 37 | #define I2C_DAVINCI_INTR_ALL (DAVINCI_I2C_IMR_SCD | \ |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 38 | DAVINCI_I2C_IMR_ARDY | \ |
| 39 | DAVINCI_I2C_IMR_NACK | \ |
| 40 | DAVINCI_I2C_IMR_AL) |
| 41 | |
| 42 | #define DAVINCI_I2C_OAR_REG 0x00 |
| 43 | #define DAVINCI_I2C_IMR_REG 0x04 |
| 44 | #define DAVINCI_I2C_STR_REG 0x08 |
| 45 | #define DAVINCI_I2C_CLKL_REG 0x0c |
| 46 | #define DAVINCI_I2C_CLKH_REG 0x10 |
| 47 | #define DAVINCI_I2C_CNT_REG 0x14 |
| 48 | #define DAVINCI_I2C_DRR_REG 0x18 |
| 49 | #define DAVINCI_I2C_SAR_REG 0x1c |
| 50 | #define DAVINCI_I2C_DXR_REG 0x20 |
| 51 | #define DAVINCI_I2C_MDR_REG 0x24 |
| 52 | #define DAVINCI_I2C_IVR_REG 0x28 |
| 53 | #define DAVINCI_I2C_EMDR_REG 0x2c |
| 54 | #define DAVINCI_I2C_PSC_REG 0x30 |
Grygorii Strashko | 7ef97e9 | 2015-04-06 15:38:41 +0300 | [diff] [blame] | 55 | #define DAVINCI_I2C_FUNC_REG 0x48 |
| 56 | #define DAVINCI_I2C_DIR_REG 0x4c |
| 57 | #define DAVINCI_I2C_DIN_REG 0x50 |
| 58 | #define DAVINCI_I2C_DOUT_REG 0x54 |
| 59 | #define DAVINCI_I2C_DSET_REG 0x58 |
| 60 | #define DAVINCI_I2C_DCLR_REG 0x5c |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 61 | |
| 62 | #define DAVINCI_I2C_IVR_AAS 0x07 |
| 63 | #define DAVINCI_I2C_IVR_SCD 0x06 |
| 64 | #define DAVINCI_I2C_IVR_XRDY 0x05 |
| 65 | #define DAVINCI_I2C_IVR_RDR 0x04 |
| 66 | #define DAVINCI_I2C_IVR_ARDY 0x03 |
| 67 | #define DAVINCI_I2C_IVR_NACK 0x02 |
| 68 | #define DAVINCI_I2C_IVR_AL 0x01 |
| 69 | |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 70 | #define DAVINCI_I2C_STR_BB BIT(12) |
| 71 | #define DAVINCI_I2C_STR_RSFULL BIT(11) |
| 72 | #define DAVINCI_I2C_STR_SCD BIT(5) |
| 73 | #define DAVINCI_I2C_STR_ARDY BIT(2) |
| 74 | #define DAVINCI_I2C_STR_NACK BIT(1) |
| 75 | #define DAVINCI_I2C_STR_AL BIT(0) |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 76 | |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 77 | #define DAVINCI_I2C_MDR_NACK BIT(15) |
| 78 | #define DAVINCI_I2C_MDR_STT BIT(13) |
| 79 | #define DAVINCI_I2C_MDR_STP BIT(11) |
| 80 | #define DAVINCI_I2C_MDR_MST BIT(10) |
| 81 | #define DAVINCI_I2C_MDR_TRX BIT(9) |
| 82 | #define DAVINCI_I2C_MDR_XA BIT(8) |
| 83 | #define DAVINCI_I2C_MDR_RM BIT(7) |
| 84 | #define DAVINCI_I2C_MDR_IRS BIT(5) |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 85 | |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 86 | #define DAVINCI_I2C_IMR_AAS BIT(6) |
| 87 | #define DAVINCI_I2C_IMR_SCD BIT(5) |
| 88 | #define DAVINCI_I2C_IMR_XRDY BIT(4) |
| 89 | #define DAVINCI_I2C_IMR_RRDY BIT(3) |
| 90 | #define DAVINCI_I2C_IMR_ARDY BIT(2) |
| 91 | #define DAVINCI_I2C_IMR_NACK BIT(1) |
| 92 | #define DAVINCI_I2C_IMR_AL BIT(0) |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 93 | |
Grygorii Strashko | 7ef97e9 | 2015-04-06 15:38:41 +0300 | [diff] [blame] | 94 | /* set SDA and SCL as GPIO */ |
| 95 | #define DAVINCI_I2C_FUNC_PFUNC0 BIT(0) |
| 96 | |
| 97 | /* set SCL as output when used as GPIO*/ |
| 98 | #define DAVINCI_I2C_DIR_PDIR0 BIT(0) |
| 99 | /* set SDA as output when used as GPIO*/ |
| 100 | #define DAVINCI_I2C_DIR_PDIR1 BIT(1) |
| 101 | |
| 102 | /* read SCL GPIO level */ |
| 103 | #define DAVINCI_I2C_DIN_PDIN0 BIT(0) |
| 104 | /* read SDA GPIO level */ |
| 105 | #define DAVINCI_I2C_DIN_PDIN1 BIT(1) |
| 106 | |
| 107 | /*set the SCL GPIO high */ |
| 108 | #define DAVINCI_I2C_DSET_PDSET0 BIT(0) |
| 109 | /*set the SDA GPIO high */ |
| 110 | #define DAVINCI_I2C_DSET_PDSET1 BIT(1) |
| 111 | |
| 112 | /* set the SCL GPIO low */ |
| 113 | #define DAVINCI_I2C_DCLR_PDCLR0 BIT(0) |
| 114 | /* set the SDA GPIO low */ |
| 115 | #define DAVINCI_I2C_DCLR_PDCLR1 BIT(1) |
| 116 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 117 | /* timeout for pm runtime autosuspend */ |
| 118 | #define DAVINCI_I2C_PM_TIMEOUT 1000 /* ms */ |
| 119 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 120 | struct davinci_i2c_dev { |
| 121 | struct device *dev; |
| 122 | void __iomem *base; |
| 123 | struct completion cmd_complete; |
| 124 | struct clk *clk; |
| 125 | int cmd_err; |
| 126 | u8 *buf; |
| 127 | size_t buf_len; |
| 128 | int irq; |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 129 | int stop; |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 130 | u8 terminate; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 131 | struct i2c_adapter adapter; |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 132 | #ifdef CONFIG_CPU_FREQ |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 133 | struct notifier_block freq_transition; |
| 134 | #endif |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 135 | struct davinci_i2c_platform_data *pdata; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 136 | }; |
| 137 | |
| 138 | /* default platform data to use if not supplied in the platform_device */ |
| 139 | static struct davinci_i2c_platform_data davinci_i2c_platform_data_default = { |
| 140 | .bus_freq = 100, |
| 141 | .bus_delay = 0, |
| 142 | }; |
| 143 | |
| 144 | static inline void davinci_i2c_write_reg(struct davinci_i2c_dev *i2c_dev, |
| 145 | int reg, u16 val) |
| 146 | { |
Taras Kondratiuk | a238dcf | 2013-11-20 20:23:44 +0200 | [diff] [blame] | 147 | writew_relaxed(val, i2c_dev->base + reg); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | static inline u16 davinci_i2c_read_reg(struct davinci_i2c_dev *i2c_dev, int reg) |
| 151 | { |
Taras Kondratiuk | a238dcf | 2013-11-20 20:23:44 +0200 | [diff] [blame] | 152 | return readw_relaxed(i2c_dev->base + reg); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 153 | } |
| 154 | |
Chaithrika U S | 5ae5b11 | 2010-01-06 14:54:58 +0530 | [diff] [blame] | 155 | static inline void davinci_i2c_reset_ctrl(struct davinci_i2c_dev *i2c_dev, |
| 156 | int val) |
| 157 | { |
| 158 | u16 w; |
| 159 | |
| 160 | w = davinci_i2c_read_reg(i2c_dev, DAVINCI_I2C_MDR_REG); |
| 161 | if (!val) /* put I2C into reset */ |
| 162 | w &= ~DAVINCI_I2C_MDR_IRS; |
| 163 | else /* take I2C out of reset */ |
| 164 | w |= DAVINCI_I2C_MDR_IRS; |
| 165 | |
| 166 | davinci_i2c_write_reg(i2c_dev, DAVINCI_I2C_MDR_REG, w); |
| 167 | } |
| 168 | |
| 169 | static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 170 | { |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 171 | struct davinci_i2c_platform_data *pdata = dev->pdata; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 172 | u16 psc; |
| 173 | u32 clk; |
Troy Kisky | cc99ff7 | 2008-07-14 22:38:20 +0200 | [diff] [blame] | 174 | u32 d; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 175 | u32 clkh; |
| 176 | u32 clkl; |
| 177 | u32 input_clock = clk_get_rate(dev->clk); |
Alexander Sverdlin | 35780e8 | 2015-09-14 11:03:50 +0200 | [diff] [blame] | 178 | struct device_node *of_node = dev->dev->of_node; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 179 | |
| 180 | /* NOTE: I2C Clock divider programming info |
| 181 | * As per I2C specs the following formulas provide prescaler |
| 182 | * and low/high divider values |
| 183 | * input clk --> PSC Div -----------> ICCL/H Div --> output clock |
| 184 | * module clk |
| 185 | * |
| 186 | * output clk = module clk / (PSC + 1) [ (ICCL + d) + (ICCH + d) ] |
| 187 | * |
| 188 | * Thus, |
| 189 | * (ICCL + ICCH) = clk = (input clk / ((psc +1) * output clk)) - 2d; |
| 190 | * |
| 191 | * where if PSC == 0, d = 7, |
| 192 | * if PSC == 1, d = 6 |
| 193 | * if PSC > 1 , d = 5 |
Alexander Sverdlin | 35780e8 | 2015-09-14 11:03:50 +0200 | [diff] [blame] | 194 | * |
| 195 | * Note: |
| 196 | * d is always 6 on Keystone I2C controller |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 197 | */ |
| 198 | |
Alexander Sverdlin | 87cb5b4 | 2015-11-30 15:51:00 +0100 | [diff] [blame] | 199 | /* |
| 200 | * Both Davinci and current Keystone User Guides recommend a value |
| 201 | * between 7MHz and 12MHz. In reality 7MHz module clock doesn't |
| 202 | * always produce enough margin between SDA and SCL transitions. |
| 203 | * Measurements show that the higher the module clock is, the |
| 204 | * bigger is the margin, providing more reliable communication. |
| 205 | * So we better target for 12MHz. |
| 206 | */ |
| 207 | psc = (input_clock / 12000000) - 1; |
Troy Kisky | cc99ff7 | 2008-07-14 22:38:20 +0200 | [diff] [blame] | 208 | if ((input_clock / (psc + 1)) > 12000000) |
| 209 | psc++; /* better to run under spec than over */ |
| 210 | d = (psc >= 2) ? 5 : 7 - psc; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 211 | |
Alexander Sverdlin | 35780e8 | 2015-09-14 11:03:50 +0200 | [diff] [blame] | 212 | if (of_node && of_device_is_compatible(of_node, "ti,keystone-i2c")) |
| 213 | d = 6; |
| 214 | |
Alexander Sverdlin | 955fc95 | 2015-06-11 11:35:26 +0200 | [diff] [blame] | 215 | clk = ((input_clock / (psc + 1)) / (pdata->bus_freq * 1000)); |
| 216 | /* Avoid driving the bus too fast because of rounding errors above */ |
| 217 | if (input_clock / (psc + 1) / clk > pdata->bus_freq * 1000) |
| 218 | clk++; |
| 219 | /* |
| 220 | * According to I2C-BUS Spec 2.1, in FAST-MODE LOW period should be at |
| 221 | * least 1.3uS, which is not the case with 50% duty cycle. Driving HIGH |
| 222 | * to LOW ratio as 1 to 2 is more safe. |
| 223 | */ |
| 224 | if (pdata->bus_freq > 100) |
| 225 | clkl = (clk << 1) / 3; |
| 226 | else |
| 227 | clkl = (clk >> 1); |
| 228 | /* |
| 229 | * It's not always possible to have 1 to 2 ratio when d=7, so fall back |
| 230 | * to minimal possible clkh in this case. |
Alexander Sverdlin | cc8de9a | 2018-07-13 17:20:17 +0200 | [diff] [blame] | 231 | * |
| 232 | * Note: |
| 233 | * CLKH is not allowed to be 0, in this case I2C clock is not generated |
| 234 | * at all |
Alexander Sverdlin | 955fc95 | 2015-06-11 11:35:26 +0200 | [diff] [blame] | 235 | */ |
Alexander Sverdlin | cc8de9a | 2018-07-13 17:20:17 +0200 | [diff] [blame] | 236 | if (clk > clkl + d) { |
Alexander Sverdlin | 955fc95 | 2015-06-11 11:35:26 +0200 | [diff] [blame] | 237 | clkh = clk - clkl - d; |
| 238 | clkl -= d; |
| 239 | } else { |
Alexander Sverdlin | cc8de9a | 2018-07-13 17:20:17 +0200 | [diff] [blame] | 240 | clkh = 1; |
Alexander Sverdlin | 955fc95 | 2015-06-11 11:35:26 +0200 | [diff] [blame] | 241 | clkl = clk - (d << 1); |
| 242 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 243 | |
| 244 | davinci_i2c_write_reg(dev, DAVINCI_I2C_PSC_REG, psc); |
| 245 | davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKH_REG, clkh); |
| 246 | davinci_i2c_write_reg(dev, DAVINCI_I2C_CLKL_REG, clkl); |
| 247 | |
Chaithrika U S | 5ae5b11 | 2010-01-06 14:54:58 +0530 | [diff] [blame] | 248 | dev_dbg(dev->dev, "input_clock = %d, CLK = %d\n", input_clock, clk); |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * This function configures I2C and brings I2C out of reset. |
| 253 | * This function is called during I2C init function. This function |
| 254 | * also gets called if I2C encounters any errors. |
| 255 | */ |
| 256 | static int i2c_davinci_init(struct davinci_i2c_dev *dev) |
| 257 | { |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 258 | struct davinci_i2c_platform_data *pdata = dev->pdata; |
Chaithrika U S | 5ae5b11 | 2010-01-06 14:54:58 +0530 | [diff] [blame] | 259 | |
| 260 | /* put I2C into reset */ |
| 261 | davinci_i2c_reset_ctrl(dev, 0); |
| 262 | |
| 263 | /* compute clock dividers */ |
| 264 | i2c_davinci_calc_clk_dividers(dev); |
| 265 | |
David Brownell | 7605fa3 | 2009-07-06 15:48:36 -0700 | [diff] [blame] | 266 | /* Respond at reserved "SMBus Host" slave address" (and zero); |
| 267 | * we seem to have no option to not respond... |
| 268 | */ |
Alexander Sverdlin | 41c8d45 | 2015-06-09 13:10:10 +0200 | [diff] [blame] | 269 | davinci_i2c_write_reg(dev, DAVINCI_I2C_OAR_REG, DAVINCI_I2C_OWN_ADDRESS); |
David Brownell | 7605fa3 | 2009-07-06 15:48:36 -0700 | [diff] [blame] | 270 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 271 | dev_dbg(dev->dev, "PSC = %d\n", |
| 272 | davinci_i2c_read_reg(dev, DAVINCI_I2C_PSC_REG)); |
| 273 | dev_dbg(dev->dev, "CLKL = %d\n", |
| 274 | davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKL_REG)); |
| 275 | dev_dbg(dev->dev, "CLKH = %d\n", |
| 276 | davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKH_REG)); |
Troy Kisky | cc99ff7 | 2008-07-14 22:38:20 +0200 | [diff] [blame] | 277 | dev_dbg(dev->dev, "bus_freq = %dkHz, bus_delay = %d\n", |
| 278 | pdata->bus_freq, pdata->bus_delay); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 279 | |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 280 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 281 | /* Take the I2C module out of reset: */ |
Chaithrika U S | 5ae5b11 | 2010-01-06 14:54:58 +0530 | [diff] [blame] | 282 | davinci_i2c_reset_ctrl(dev, 1); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 283 | |
| 284 | /* Enable interrupts */ |
| 285 | davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, I2C_DAVINCI_INTR_ALL); |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | /* |
Phil Reid | cd2428c | 2017-11-02 10:40:29 +0800 | [diff] [blame] | 291 | * This routine does i2c bus recovery by using i2c_generic_scl_recovery |
Grygorii Strashko | 2e65676 | 2015-04-06 15:38:40 +0300 | [diff] [blame] | 292 | * which is provided by I2C Bus recovery infrastructure. |
| 293 | */ |
| 294 | static void davinci_i2c_prepare_recovery(struct i2c_adapter *adap) |
| 295 | { |
| 296 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 297 | |
| 298 | /* Disable interrupts */ |
| 299 | davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, 0); |
| 300 | |
| 301 | /* put I2C into reset */ |
| 302 | davinci_i2c_reset_ctrl(dev, 0); |
| 303 | } |
| 304 | |
| 305 | static void davinci_i2c_unprepare_recovery(struct i2c_adapter *adap) |
| 306 | { |
| 307 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 308 | |
| 309 | i2c_davinci_init(dev); |
| 310 | } |
| 311 | |
| 312 | static struct i2c_bus_recovery_info davinci_i2c_gpio_recovery_info = { |
Phil Reid | cd2428c | 2017-11-02 10:40:29 +0800 | [diff] [blame] | 313 | .recover_bus = i2c_generic_scl_recovery, |
Grygorii Strashko | 2e65676 | 2015-04-06 15:38:40 +0300 | [diff] [blame] | 314 | .prepare_recovery = davinci_i2c_prepare_recovery, |
| 315 | .unprepare_recovery = davinci_i2c_unprepare_recovery, |
| 316 | }; |
| 317 | |
Grygorii Strashko | 7ef97e9 | 2015-04-06 15:38:41 +0300 | [diff] [blame] | 318 | static void davinci_i2c_set_scl(struct i2c_adapter *adap, int val) |
| 319 | { |
| 320 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 321 | |
| 322 | if (val) |
| 323 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DSET_REG, |
| 324 | DAVINCI_I2C_DSET_PDSET0); |
| 325 | else |
| 326 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DCLR_REG, |
| 327 | DAVINCI_I2C_DCLR_PDCLR0); |
| 328 | } |
| 329 | |
| 330 | static int davinci_i2c_get_scl(struct i2c_adapter *adap) |
| 331 | { |
| 332 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 333 | int val; |
| 334 | |
| 335 | /* read the state of SCL */ |
| 336 | val = davinci_i2c_read_reg(dev, DAVINCI_I2C_DIN_REG); |
| 337 | return val & DAVINCI_I2C_DIN_PDIN0; |
| 338 | } |
| 339 | |
| 340 | static int davinci_i2c_get_sda(struct i2c_adapter *adap) |
| 341 | { |
| 342 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 343 | int val; |
| 344 | |
| 345 | /* read the state of SDA */ |
| 346 | val = davinci_i2c_read_reg(dev, DAVINCI_I2C_DIN_REG); |
| 347 | return val & DAVINCI_I2C_DIN_PDIN1; |
| 348 | } |
| 349 | |
| 350 | static void davinci_i2c_scl_prepare_recovery(struct i2c_adapter *adap) |
| 351 | { |
| 352 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 353 | |
| 354 | davinci_i2c_prepare_recovery(adap); |
| 355 | |
| 356 | /* SCL output, SDA input */ |
| 357 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DIR_REG, DAVINCI_I2C_DIR_PDIR0); |
| 358 | |
| 359 | /* change to GPIO mode */ |
| 360 | davinci_i2c_write_reg(dev, DAVINCI_I2C_FUNC_REG, |
| 361 | DAVINCI_I2C_FUNC_PFUNC0); |
| 362 | } |
| 363 | |
| 364 | static void davinci_i2c_scl_unprepare_recovery(struct i2c_adapter *adap) |
| 365 | { |
| 366 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 367 | |
| 368 | /* change back to I2C mode */ |
| 369 | davinci_i2c_write_reg(dev, DAVINCI_I2C_FUNC_REG, 0); |
| 370 | |
| 371 | davinci_i2c_unprepare_recovery(adap); |
| 372 | } |
| 373 | |
| 374 | static struct i2c_bus_recovery_info davinci_i2c_scl_recovery_info = { |
| 375 | .recover_bus = i2c_generic_scl_recovery, |
| 376 | .set_scl = davinci_i2c_set_scl, |
| 377 | .get_scl = davinci_i2c_get_scl, |
| 378 | .get_sda = davinci_i2c_get_sda, |
| 379 | .prepare_recovery = davinci_i2c_scl_prepare_recovery, |
| 380 | .unprepare_recovery = davinci_i2c_scl_unprepare_recovery, |
| 381 | }; |
| 382 | |
Grygorii Strashko | 2e65676 | 2015-04-06 15:38:40 +0300 | [diff] [blame] | 383 | /* |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 384 | * Waiting for bus not busy |
| 385 | */ |
Alexander Sverdlin | 72a956c | 2015-06-09 12:58:29 +0200 | [diff] [blame] | 386 | static int i2c_davinci_wait_bus_not_busy(struct davinci_i2c_dev *dev) |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 387 | { |
Alexander Sverdlin | 72a956c | 2015-06-09 12:58:29 +0200 | [diff] [blame] | 388 | unsigned long timeout = jiffies + dev->adapter.timeout; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 389 | |
Alexander Sverdlin | 72a956c | 2015-06-09 12:58:29 +0200 | [diff] [blame] | 390 | do { |
| 391 | if (!(davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG) & DAVINCI_I2C_STR_BB)) |
| 392 | return 0; |
| 393 | schedule_timeout_uninterruptible(1); |
| 394 | } while (time_before_eq(jiffies, timeout)); |
| 395 | |
| 396 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); |
| 397 | i2c_recover_bus(&dev->adapter); |
| 398 | |
| 399 | /* |
| 400 | * if bus is still "busy" here, it's most probably a HW problem like |
| 401 | * short-circuit |
| 402 | */ |
| 403 | if (davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG) & DAVINCI_I2C_STR_BB) |
| 404 | return -EIO; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 405 | |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * Low level master read/write transaction. This function is called |
| 411 | * from i2c_davinci_xfer. |
| 412 | */ |
| 413 | static int |
| 414 | i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop) |
| 415 | { |
| 416 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 417 | struct davinci_i2c_platform_data *pdata = dev->pdata; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 418 | u32 flag; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 419 | u16 w; |
Nicholas Mc Guire | d9e1f44 | 2015-03-17 03:51:13 -0400 | [diff] [blame] | 420 | unsigned long time_left; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 421 | |
Alexander Sverdlin | 41c8d45 | 2015-06-09 13:10:10 +0200 | [diff] [blame] | 422 | if (msg->addr == DAVINCI_I2C_OWN_ADDRESS) { |
| 423 | dev_warn(dev->dev, "transfer to own address aborted\n"); |
| 424 | return -EADDRNOTAVAIL; |
| 425 | } |
| 426 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 427 | /* Introduce a delay, required for some boards (e.g Davinci EVM) */ |
| 428 | if (pdata->bus_delay) |
| 429 | udelay(pdata->bus_delay); |
| 430 | |
| 431 | /* set the slave address */ |
| 432 | davinci_i2c_write_reg(dev, DAVINCI_I2C_SAR_REG, msg->addr); |
| 433 | |
| 434 | dev->buf = msg->buf; |
| 435 | dev->buf_len = msg->len; |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 436 | dev->stop = stop; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 437 | |
| 438 | davinci_i2c_write_reg(dev, DAVINCI_I2C_CNT_REG, dev->buf_len); |
| 439 | |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 440 | reinit_completion(&dev->cmd_complete); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 441 | dev->cmd_err = 0; |
| 442 | |
Jon Povey | c5b4afe | 2010-10-12 13:47:05 +0900 | [diff] [blame] | 443 | /* Take I2C out of reset and configure it as master */ |
| 444 | flag = DAVINCI_I2C_MDR_IRS | DAVINCI_I2C_MDR_MST; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 445 | |
| 446 | /* if the slave address is ten bit address, enable XA bit */ |
| 447 | if (msg->flags & I2C_M_TEN) |
| 448 | flag |= DAVINCI_I2C_MDR_XA; |
| 449 | if (!(msg->flags & I2C_M_RD)) |
| 450 | flag |= DAVINCI_I2C_MDR_TRX; |
Jon Povey | c5b4afe | 2010-10-12 13:47:05 +0900 | [diff] [blame] | 451 | if (msg->len == 0) |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 452 | flag |= DAVINCI_I2C_MDR_RM; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 453 | |
| 454 | /* Enable receive or transmit interrupts */ |
| 455 | w = davinci_i2c_read_reg(dev, DAVINCI_I2C_IMR_REG); |
| 456 | if (msg->flags & I2C_M_RD) |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 457 | w |= DAVINCI_I2C_IMR_RRDY; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 458 | else |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 459 | w |= DAVINCI_I2C_IMR_XRDY; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 460 | davinci_i2c_write_reg(dev, DAVINCI_I2C_IMR_REG, w); |
| 461 | |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 462 | dev->terminate = 0; |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 463 | |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 464 | /* |
Jon Povey | c5b4afe | 2010-10-12 13:47:05 +0900 | [diff] [blame] | 465 | * Write mode register first as needed for correct behaviour |
| 466 | * on OMAP-L138, but don't set STT yet to avoid a race with XRDY |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 467 | * occurring before we have loaded DXR |
Jon Povey | c5b4afe | 2010-10-12 13:47:05 +0900 | [diff] [blame] | 468 | */ |
| 469 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag); |
| 470 | |
| 471 | /* |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 472 | * First byte should be set here, not after interrupt, |
| 473 | * because transmit-data-ready interrupt can come before |
| 474 | * NACK-interrupt during sending of previous message and |
| 475 | * ICDXR may have wrong data |
Jon Povey | c5b4afe | 2010-10-12 13:47:05 +0900 | [diff] [blame] | 476 | * It also saves us one interrupt, slightly faster |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 477 | */ |
| 478 | if ((!(msg->flags & I2C_M_RD)) && dev->buf_len) { |
| 479 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DXR_REG, *dev->buf++); |
| 480 | dev->buf_len--; |
| 481 | } |
| 482 | |
Jon Povey | c5b4afe | 2010-10-12 13:47:05 +0900 | [diff] [blame] | 483 | /* Set STT to begin transmit now DXR is loaded */ |
| 484 | flag |= DAVINCI_I2C_MDR_STT; |
| 485 | if (stop && msg->len != 0) |
| 486 | flag |= DAVINCI_I2C_MDR_STP; |
Jon Povey | 4bba0fd | 2010-09-17 12:02:11 +0900 | [diff] [blame] | 487 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag); |
| 488 | |
Nicholas Mc Guire | d9e1f44 | 2015-03-17 03:51:13 -0400 | [diff] [blame] | 489 | time_left = wait_for_completion_timeout(&dev->cmd_complete, |
| 490 | dev->adapter.timeout); |
| 491 | if (!time_left) { |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 492 | dev_err(dev->dev, "controller timed out\n"); |
Grygorii Strashko | 2e65676 | 2015-04-06 15:38:40 +0300 | [diff] [blame] | 493 | i2c_recover_bus(adap); |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 494 | dev->buf_len = 0; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 495 | return -ETIMEDOUT; |
| 496 | } |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 497 | if (dev->buf_len) { |
| 498 | /* This should be 0 if all bytes were transferred |
| 499 | * or dev->cmd_err denotes an error. |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 500 | */ |
Wolfram Sang | 631de7a | 2017-10-18 00:17:09 +0200 | [diff] [blame] | 501 | dev_err(dev->dev, "abnormal termination buf_len=%zu\n", |
Nicholas Mc Guire | d9e1f44 | 2015-03-17 03:51:13 -0400 | [diff] [blame] | 502 | dev->buf_len); |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 503 | dev->terminate = 1; |
| 504 | wmb(); |
| 505 | dev->buf_len = 0; |
Nicholas Mc Guire | d9e1f44 | 2015-03-17 03:51:13 -0400 | [diff] [blame] | 506 | return -EREMOTEIO; |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 507 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 508 | |
| 509 | /* no error */ |
| 510 | if (likely(!dev->cmd_err)) |
| 511 | return msg->len; |
| 512 | |
| 513 | /* We have an error */ |
| 514 | if (dev->cmd_err & DAVINCI_I2C_STR_AL) { |
| 515 | i2c_davinci_init(dev); |
| 516 | return -EIO; |
| 517 | } |
| 518 | |
| 519 | if (dev->cmd_err & DAVINCI_I2C_STR_NACK) { |
| 520 | if (msg->flags & I2C_M_IGNORE_NAK) |
| 521 | return msg->len; |
Grygorii Strashko | 9ea359f7 | 2014-12-01 17:34:04 +0200 | [diff] [blame] | 522 | w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); |
| 523 | w |= DAVINCI_I2C_MDR_STP; |
| 524 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 525 | return -EREMOTEIO; |
| 526 | } |
| 527 | return -EIO; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Prepare controller for a transaction and call i2c_davinci_xfer_msg |
| 532 | */ |
| 533 | static int |
| 534 | i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) |
| 535 | { |
| 536 | struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); |
| 537 | int i; |
| 538 | int ret; |
| 539 | |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 540 | dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 541 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 542 | ret = pm_runtime_get_sync(dev->dev); |
| 543 | if (ret < 0) { |
| 544 | dev_err(dev->dev, "Failed to runtime_get device: %d\n", ret); |
| 545 | pm_runtime_put_noidle(dev->dev); |
| 546 | return ret; |
| 547 | } |
| 548 | |
Alexander Sverdlin | 72a956c | 2015-06-09 12:58:29 +0200 | [diff] [blame] | 549 | ret = i2c_davinci_wait_bus_not_busy(dev); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 550 | if (ret < 0) { |
| 551 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 552 | goto out; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | for (i = 0; i < num; i++) { |
| 556 | ret = i2c_davinci_xfer_msg(adap, &msgs[i], (i == (num - 1))); |
Troy Kisky | d868caa | 2008-07-14 22:38:20 +0200 | [diff] [blame] | 557 | dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num, |
| 558 | ret); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 559 | if (ret < 0) |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 560 | goto out; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 561 | } |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 562 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 563 | ret = num; |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 564 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 565 | out: |
| 566 | pm_runtime_mark_last_busy(dev->dev); |
| 567 | pm_runtime_put_autosuspend(dev->dev); |
| 568 | |
| 569 | return ret; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | static u32 i2c_davinci_func(struct i2c_adapter *adap) |
| 573 | { |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 574 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 575 | } |
| 576 | |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 577 | static void terminate_read(struct davinci_i2c_dev *dev) |
| 578 | { |
| 579 | u16 w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); |
| 580 | w |= DAVINCI_I2C_MDR_NACK; |
| 581 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w); |
| 582 | |
| 583 | /* Throw away data */ |
| 584 | davinci_i2c_read_reg(dev, DAVINCI_I2C_DRR_REG); |
| 585 | if (!dev->terminate) |
| 586 | dev_err(dev->dev, "RDR IRQ while no data requested\n"); |
| 587 | } |
| 588 | static void terminate_write(struct davinci_i2c_dev *dev) |
| 589 | { |
| 590 | u16 w = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG); |
| 591 | w |= DAVINCI_I2C_MDR_RM | DAVINCI_I2C_MDR_STP; |
| 592 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, w); |
| 593 | |
| 594 | if (!dev->terminate) |
David Brownell | 7605fa3 | 2009-07-06 15:48:36 -0700 | [diff] [blame] | 595 | dev_dbg(dev->dev, "TDR IRQ while no data to send\n"); |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 596 | } |
| 597 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 598 | /* |
| 599 | * Interrupt service routine. This gets called whenever an I2C interrupt |
| 600 | * occurs. |
| 601 | */ |
| 602 | static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id) |
| 603 | { |
| 604 | struct davinci_i2c_dev *dev = dev_id; |
| 605 | u32 stat; |
| 606 | int count = 0; |
| 607 | u16 w; |
| 608 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 609 | if (pm_runtime_suspended(dev->dev)) |
| 610 | return IRQ_NONE; |
| 611 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 612 | while ((stat = davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG))) { |
Harvey Harrison | 08882d2 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 613 | dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 614 | if (count++ == 100) { |
| 615 | dev_warn(dev->dev, "Too much work in one IRQ\n"); |
| 616 | break; |
| 617 | } |
| 618 | |
| 619 | switch (stat) { |
| 620 | case DAVINCI_I2C_IVR_AL: |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 621 | /* Arbitration lost, must retry */ |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 622 | dev->cmd_err |= DAVINCI_I2C_STR_AL; |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 623 | dev->buf_len = 0; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 624 | complete(&dev->cmd_complete); |
| 625 | break; |
| 626 | |
| 627 | case DAVINCI_I2C_IVR_NACK: |
| 628 | dev->cmd_err |= DAVINCI_I2C_STR_NACK; |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 629 | dev->buf_len = 0; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 630 | complete(&dev->cmd_complete); |
| 631 | break; |
| 632 | |
| 633 | case DAVINCI_I2C_IVR_ARDY: |
Troy Kisky | b73a9ae | 2008-04-11 12:07:05 +0200 | [diff] [blame] | 634 | davinci_i2c_write_reg(dev, |
| 635 | DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_ARDY); |
Dirk Behme | c6c7c72 | 2008-03-28 06:16:12 +0100 | [diff] [blame] | 636 | if (((dev->buf_len == 0) && (dev->stop != 0)) || |
| 637 | (dev->cmd_err & DAVINCI_I2C_STR_NACK)) { |
| 638 | w = davinci_i2c_read_reg(dev, |
| 639 | DAVINCI_I2C_MDR_REG); |
| 640 | w |= DAVINCI_I2C_MDR_STP; |
| 641 | davinci_i2c_write_reg(dev, |
| 642 | DAVINCI_I2C_MDR_REG, w); |
| 643 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 644 | complete(&dev->cmd_complete); |
| 645 | break; |
| 646 | |
| 647 | case DAVINCI_I2C_IVR_RDR: |
| 648 | if (dev->buf_len) { |
| 649 | *dev->buf++ = |
| 650 | davinci_i2c_read_reg(dev, |
| 651 | DAVINCI_I2C_DRR_REG); |
| 652 | dev->buf_len--; |
| 653 | if (dev->buf_len) |
| 654 | continue; |
| 655 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 656 | davinci_i2c_write_reg(dev, |
Troy Kisky | b73a9ae | 2008-04-11 12:07:05 +0200 | [diff] [blame] | 657 | DAVINCI_I2C_STR_REG, |
| 658 | DAVINCI_I2C_IMR_RRDY); |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 659 | } else { |
| 660 | /* signal can terminate transfer */ |
| 661 | terminate_read(dev); |
| 662 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 663 | break; |
| 664 | |
| 665 | case DAVINCI_I2C_IVR_XRDY: |
| 666 | if (dev->buf_len) { |
| 667 | davinci_i2c_write_reg(dev, DAVINCI_I2C_DXR_REG, |
| 668 | *dev->buf++); |
| 669 | dev->buf_len--; |
| 670 | if (dev->buf_len) |
| 671 | continue; |
| 672 | |
| 673 | w = davinci_i2c_read_reg(dev, |
| 674 | DAVINCI_I2C_IMR_REG); |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 675 | w &= ~DAVINCI_I2C_IMR_XRDY; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 676 | davinci_i2c_write_reg(dev, |
| 677 | DAVINCI_I2C_IMR_REG, |
| 678 | w); |
Troy Kisky | 5a0d5f5 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 679 | } else { |
| 680 | /* signal can terminate transfer */ |
| 681 | terminate_write(dev); |
| 682 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 683 | break; |
| 684 | |
| 685 | case DAVINCI_I2C_IVR_SCD: |
Troy Kisky | b73a9ae | 2008-04-11 12:07:05 +0200 | [diff] [blame] | 686 | davinci_i2c_write_reg(dev, |
| 687 | DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_SCD); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 688 | complete(&dev->cmd_complete); |
| 689 | break; |
| 690 | |
| 691 | case DAVINCI_I2C_IVR_AAS: |
David Brownell | 7605fa3 | 2009-07-06 15:48:36 -0700 | [diff] [blame] | 692 | dev_dbg(dev->dev, "Address as slave interrupt\n"); |
| 693 | break; |
| 694 | |
| 695 | default: |
| 696 | dev_warn(dev->dev, "Unrecognized irq stat %d\n", stat); |
| 697 | break; |
| 698 | } |
| 699 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 700 | |
| 701 | return count ? IRQ_HANDLED : IRQ_NONE; |
| 702 | } |
| 703 | |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 704 | #ifdef CONFIG_CPU_FREQ |
| 705 | static int i2c_davinci_cpufreq_transition(struct notifier_block *nb, |
| 706 | unsigned long val, void *data) |
| 707 | { |
| 708 | struct davinci_i2c_dev *dev; |
| 709 | |
| 710 | dev = container_of(nb, struct davinci_i2c_dev, freq_transition); |
Bartosz Golaszewski | 19cfcaf | 2018-01-22 15:42:58 +0100 | [diff] [blame] | 711 | |
Peter Rosin | 3f3a89e | 2018-06-20 07:18:03 +0200 | [diff] [blame] | 712 | i2c_lock_bus(&dev->adapter, I2C_LOCK_ROOT_ADAPTER); |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 713 | if (val == CPUFREQ_PRECHANGE) { |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 714 | davinci_i2c_reset_ctrl(dev, 0); |
| 715 | } else if (val == CPUFREQ_POSTCHANGE) { |
| 716 | i2c_davinci_calc_clk_dividers(dev); |
| 717 | davinci_i2c_reset_ctrl(dev, 1); |
| 718 | } |
Peter Rosin | 3f3a89e | 2018-06-20 07:18:03 +0200 | [diff] [blame] | 719 | i2c_unlock_bus(&dev->adapter, I2C_LOCK_ROOT_ADAPTER); |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 720 | |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | static inline int i2c_davinci_cpufreq_register(struct davinci_i2c_dev *dev) |
| 725 | { |
| 726 | dev->freq_transition.notifier_call = i2c_davinci_cpufreq_transition; |
| 727 | |
| 728 | return cpufreq_register_notifier(&dev->freq_transition, |
| 729 | CPUFREQ_TRANSITION_NOTIFIER); |
| 730 | } |
| 731 | |
| 732 | static inline void i2c_davinci_cpufreq_deregister(struct davinci_i2c_dev *dev) |
| 733 | { |
| 734 | cpufreq_unregister_notifier(&dev->freq_transition, |
| 735 | CPUFREQ_TRANSITION_NOTIFIER); |
| 736 | } |
| 737 | #else |
| 738 | static inline int i2c_davinci_cpufreq_register(struct davinci_i2c_dev *dev) |
| 739 | { |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | static inline void i2c_davinci_cpufreq_deregister(struct davinci_i2c_dev *dev) |
| 744 | { |
| 745 | } |
| 746 | #endif |
| 747 | |
Gustavo A. R. Silva | 8dc0f8c | 2017-07-09 15:57:44 -0500 | [diff] [blame] | 748 | static const struct i2c_algorithm i2c_davinci_algo = { |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 749 | .master_xfer = i2c_davinci_xfer, |
| 750 | .functionality = i2c_davinci_func, |
| 751 | }; |
| 752 | |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 753 | static const struct of_device_id davinci_i2c_of_match[] = { |
| 754 | {.compatible = "ti,davinci-i2c", }, |
Alexander Sverdlin | 35780e8 | 2015-09-14 11:03:50 +0200 | [diff] [blame] | 755 | {.compatible = "ti,keystone-i2c", }, |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 756 | {}, |
| 757 | }; |
| 758 | MODULE_DEVICE_TABLE(of, davinci_i2c_of_match); |
| 759 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 760 | static int davinci_i2c_probe(struct platform_device *pdev) |
| 761 | { |
| 762 | struct davinci_i2c_dev *dev; |
| 763 | struct i2c_adapter *adap; |
Grygorii Strashko | 2c6ef04 | 2014-12-01 17:34:03 +0200 | [diff] [blame] | 764 | struct resource *mem; |
Phil Reid | cd2428c | 2017-11-02 10:40:29 +0800 | [diff] [blame] | 765 | struct i2c_bus_recovery_info *rinfo; |
Grygorii Strashko | 2c6ef04 | 2014-12-01 17:34:03 +0200 | [diff] [blame] | 766 | int r, irq; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 767 | |
Grygorii Strashko | 2c6ef04 | 2014-12-01 17:34:03 +0200 | [diff] [blame] | 768 | irq = platform_get_irq(pdev, 0); |
| 769 | if (irq <= 0) { |
| 770 | if (!irq) |
| 771 | irq = -ENXIO; |
| 772 | if (irq != -EPROBE_DEFER) |
| 773 | dev_err(&pdev->dev, |
| 774 | "can't get irq resource ret=%d\n", irq); |
| 775 | return irq; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 776 | } |
| 777 | |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 778 | dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_i2c_dev), |
| 779 | GFP_KERNEL); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 780 | if (!dev) { |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 781 | dev_err(&pdev->dev, "Memory allocation failed\n"); |
| 782 | return -ENOMEM; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 783 | } |
| 784 | |
Troy Kisky | 2e74378 | 2008-07-14 22:38:21 +0200 | [diff] [blame] | 785 | init_completion(&dev->cmd_complete); |
Bartosz Golaszewski | 19cfcaf | 2018-01-22 15:42:58 +0100 | [diff] [blame] | 786 | |
Wolfram Sang | c4df500 | 2013-04-18 15:43:07 +0200 | [diff] [blame] | 787 | dev->dev = &pdev->dev; |
Grygorii Strashko | 2c6ef04 | 2014-12-01 17:34:03 +0200 | [diff] [blame] | 788 | dev->irq = irq; |
Olof Johansson | 1e2c239 | 2013-09-05 12:23:44 -0700 | [diff] [blame] | 789 | dev->pdata = dev_get_platdata(&pdev->dev); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 790 | platform_set_drvdata(pdev, dev); |
| 791 | |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 792 | if (!dev->pdata && pdev->dev.of_node) { |
| 793 | u32 prop; |
| 794 | |
| 795 | dev->pdata = devm_kzalloc(&pdev->dev, |
| 796 | sizeof(struct davinci_i2c_platform_data), GFP_KERNEL); |
Wolfram Sang | c4df500 | 2013-04-18 15:43:07 +0200 | [diff] [blame] | 797 | if (!dev->pdata) |
| 798 | return -ENOMEM; |
| 799 | |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 800 | memcpy(dev->pdata, &davinci_i2c_platform_data_default, |
| 801 | sizeof(struct davinci_i2c_platform_data)); |
| 802 | if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency", |
| 803 | &prop)) |
| 804 | dev->pdata->bus_freq = prop / 1000; |
Grygorii Strashko | 7ef97e9 | 2015-04-06 15:38:41 +0300 | [diff] [blame] | 805 | |
| 806 | dev->pdata->has_pfunc = |
| 807 | of_property_read_bool(pdev->dev.of_node, |
| 808 | "ti,has-pfunc"); |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 809 | } else if (!dev->pdata) { |
| 810 | dev->pdata = &davinci_i2c_platform_data_default; |
| 811 | } |
| 812 | |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 813 | dev->clk = devm_clk_get(&pdev->dev, NULL); |
Wolfram Sang | c4df500 | 2013-04-18 15:43:07 +0200 | [diff] [blame] | 814 | if (IS_ERR(dev->clk)) |
Franklin S Cooper Jr | cc209ac | 2017-08-16 17:17:13 -0500 | [diff] [blame] | 815 | return PTR_ERR(dev->clk); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 816 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 817 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 818 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
| 819 | if (IS_ERR(dev->base)) { |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 820 | return PTR_ERR(dev->base); |
| 821 | } |
| 822 | |
| 823 | pm_runtime_set_autosuspend_delay(dev->dev, |
| 824 | DAVINCI_I2C_PM_TIMEOUT); |
| 825 | pm_runtime_use_autosuspend(dev->dev); |
| 826 | |
| 827 | pm_runtime_enable(dev->dev); |
| 828 | |
| 829 | r = pm_runtime_get_sync(dev->dev); |
| 830 | if (r < 0) { |
| 831 | dev_err(dev->dev, "failed to runtime_get device: %d\n", r); |
| 832 | pm_runtime_put_noidle(dev->dev); |
| 833 | return r; |
Chaithrika U S | c062a25 | 2010-01-06 14:54:57 +0530 | [diff] [blame] | 834 | } |
| 835 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 836 | i2c_davinci_init(dev); |
| 837 | |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 838 | r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0, |
| 839 | pdev->name, dev); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 840 | if (r) { |
| 841 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); |
| 842 | goto err_unuse_clocks; |
| 843 | } |
| 844 | |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 845 | r = i2c_davinci_cpufreq_register(dev); |
| 846 | if (r) { |
| 847 | dev_err(&pdev->dev, "failed to register cpufreq\n"); |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 848 | goto err_unuse_clocks; |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 849 | } |
| 850 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 851 | adap = &dev->adapter; |
| 852 | i2c_set_adapdata(adap, dev); |
| 853 | adap->owner = THIS_MODULE; |
Wolfram Sang | adcb82a | 2014-07-10 13:46:25 +0200 | [diff] [blame] | 854 | adap->class = I2C_CLASS_DEPRECATED; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 855 | strlcpy(adap->name, "DaVinci I2C adapter", sizeof(adap->name)); |
| 856 | adap->algo = &i2c_davinci_algo; |
| 857 | adap->dev.parent = &pdev->dev; |
Jean Delvare | 98a679c | 2009-03-28 21:34:43 +0100 | [diff] [blame] | 858 | adap->timeout = DAVINCI_I2C_TIMEOUT; |
Heiko Schocher | 5c3d8a4 | 2012-07-30 07:21:12 +0000 | [diff] [blame] | 859 | adap->dev.of_node = pdev->dev.of_node; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 860 | |
Grygorii Strashko | 7ef97e9 | 2015-04-06 15:38:41 +0300 | [diff] [blame] | 861 | if (dev->pdata->has_pfunc) |
| 862 | adap->bus_recovery_info = &davinci_i2c_scl_recovery_info; |
Linus Walleij | e535376 | 2017-12-20 13:17:49 +0100 | [diff] [blame] | 863 | else if (dev->pdata->gpio_recovery) { |
Phil Reid | cd2428c | 2017-11-02 10:40:29 +0800 | [diff] [blame] | 864 | rinfo = &davinci_i2c_gpio_recovery_info; |
| 865 | adap->bus_recovery_info = rinfo; |
Linus Walleij | e535376 | 2017-12-20 13:17:49 +0100 | [diff] [blame] | 866 | rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", |
| 867 | GPIOD_OUT_HIGH_OPEN_DRAIN); |
| 868 | if (IS_ERR(rinfo->scl_gpiod)) { |
| 869 | r = PTR_ERR(rinfo->scl_gpiod); |
Phil Reid | cd2428c | 2017-11-02 10:40:29 +0800 | [diff] [blame] | 870 | goto err_unuse_clocks; |
Linus Walleij | e535376 | 2017-12-20 13:17:49 +0100 | [diff] [blame] | 871 | } |
| 872 | rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN); |
| 873 | if (IS_ERR(rinfo->sda_gpiod)) { |
| 874 | r = PTR_ERR(rinfo->sda_gpiod); |
Phil Reid | cd2428c | 2017-11-02 10:40:29 +0800 | [diff] [blame] | 875 | goto err_unuse_clocks; |
Linus Walleij | e535376 | 2017-12-20 13:17:49 +0100 | [diff] [blame] | 876 | } |
Grygorii Strashko | 2e65676 | 2015-04-06 15:38:40 +0300 | [diff] [blame] | 877 | } |
| 878 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 879 | adap->nr = pdev->id; |
| 880 | r = i2c_add_numbered_adapter(adap); |
Wolfram Sang | ea73440 | 2016-08-09 13:36:17 +0200 | [diff] [blame] | 881 | if (r) |
Vishwanathrao Badarkhe, Manish | 8579684 | 2013-03-05 01:44:45 +0000 | [diff] [blame] | 882 | goto err_unuse_clocks; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 883 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 884 | pm_runtime_mark_last_busy(dev->dev); |
| 885 | pm_runtime_put_autosuspend(dev->dev); |
| 886 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 887 | return 0; |
| 888 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 889 | err_unuse_clocks: |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 890 | pm_runtime_dont_use_autosuspend(dev->dev); |
| 891 | pm_runtime_put_sync(dev->dev); |
| 892 | pm_runtime_disable(dev->dev); |
| 893 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 894 | return r; |
| 895 | } |
| 896 | |
| 897 | static int davinci_i2c_remove(struct platform_device *pdev) |
| 898 | { |
| 899 | struct davinci_i2c_dev *dev = platform_get_drvdata(pdev); |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 900 | int ret; |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 901 | |
Chaithrika U S | 82c0de1 | 2010-01-06 14:55:00 +0530 | [diff] [blame] | 902 | i2c_davinci_cpufreq_deregister(dev); |
| 903 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 904 | i2c_del_adapter(&dev->adapter); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 905 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 906 | ret = pm_runtime_get_sync(&pdev->dev); |
| 907 | if (ret < 0) { |
| 908 | pm_runtime_put_noidle(&pdev->dev); |
| 909 | return ret; |
| 910 | } |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 911 | |
| 912 | davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0); |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 913 | |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 914 | pm_runtime_dont_use_autosuspend(dev->dev); |
| 915 | pm_runtime_put_sync(dev->dev); |
| 916 | pm_runtime_disable(dev->dev); |
| 917 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 918 | return 0; |
| 919 | } |
| 920 | |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 921 | #ifdef CONFIG_PM |
| 922 | static int davinci_i2c_suspend(struct device *dev) |
| 923 | { |
Masahiro Yamada | 9242e72 | 2017-07-28 01:16:24 +0900 | [diff] [blame] | 924 | struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev); |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 925 | |
| 926 | /* put I2C into reset */ |
| 927 | davinci_i2c_reset_ctrl(i2c_dev, 0); |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 928 | |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | static int davinci_i2c_resume(struct device *dev) |
| 933 | { |
Masahiro Yamada | 9242e72 | 2017-07-28 01:16:24 +0900 | [diff] [blame] | 934 | struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev); |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 935 | |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 936 | /* take I2C out of reset */ |
| 937 | davinci_i2c_reset_ctrl(i2c_dev, 1); |
| 938 | |
| 939 | return 0; |
| 940 | } |
| 941 | |
| 942 | static const struct dev_pm_ops davinci_i2c_pm = { |
| 943 | .suspend = davinci_i2c_suspend, |
| 944 | .resume = davinci_i2c_resume, |
Franklin S Cooper Jr | 17f8815 | 2017-09-11 15:11:44 -0500 | [diff] [blame] | 945 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, |
| 946 | pm_runtime_force_resume) |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 947 | }; |
| 948 | |
| 949 | #define davinci_i2c_pm_ops (&davinci_i2c_pm) |
| 950 | #else |
| 951 | #define davinci_i2c_pm_ops NULL |
| 952 | #endif |
| 953 | |
Kay Sievers | add8eda | 2008-04-22 22:16:49 +0200 | [diff] [blame] | 954 | /* work with hotplug and coldplug */ |
| 955 | MODULE_ALIAS("platform:i2c_davinci"); |
| 956 | |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 957 | static struct platform_driver davinci_i2c_driver = { |
| 958 | .probe = davinci_i2c_probe, |
| 959 | .remove = davinci_i2c_remove, |
| 960 | .driver = { |
| 961 | .name = "i2c_davinci", |
Chaithrika U S | 68f15de | 2010-01-06 14:54:59 +0530 | [diff] [blame] | 962 | .pm = davinci_i2c_pm_ops, |
Sachin Kamat | 4e90532 | 2013-09-30 09:04:25 +0530 | [diff] [blame] | 963 | .of_match_table = davinci_i2c_of_match, |
Vladimir Barinov | 95a7f10 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 964 | }, |
| 965 | }; |
| 966 | |
| 967 | /* I2C may be needed to bring up other drivers */ |
| 968 | static int __init davinci_i2c_init_driver(void) |
| 969 | { |
| 970 | return platform_driver_register(&davinci_i2c_driver); |
| 971 | } |
| 972 | subsys_initcall(davinci_i2c_init_driver); |
| 973 | |
| 974 | static void __exit davinci_i2c_exit_driver(void) |
| 975 | { |
| 976 | platform_driver_unregister(&davinci_i2c_driver); |
| 977 | } |
| 978 | module_exit(davinci_i2c_exit_driver); |
| 979 | |
| 980 | MODULE_AUTHOR("Texas Instruments India"); |
| 981 | MODULE_DESCRIPTION("TI DaVinci I2C bus adapter"); |
| 982 | MODULE_LICENSE("GPL"); |