Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 2 | /* |
| 3 | * Marvell Armada-3700 SPI controller driver |
| 4 | * |
| 5 | * Copyright (C) 2016 Marvell Ltd. |
| 6 | * |
| 7 | * Author: Wilson Ding <dingwei@marvell.com> |
| 8 | * Author: Romain Perier <romain.perier@free-electrons.com> |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/clk.h> |
| 12 | #include <linux/completion.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/of.h> |
| 20 | #include <linux/of_irq.h> |
| 21 | #include <linux/of_device.h> |
| 22 | #include <linux/pinctrl/consumer.h> |
| 23 | #include <linux/spi/spi.h> |
| 24 | |
| 25 | #define DRIVER_NAME "armada_3700_spi" |
| 26 | |
Maxime Chevallier | abf3a49 | 2018-01-17 17:15:26 +0100 | [diff] [blame] | 27 | #define A3700_SPI_MAX_SPEED_HZ 100000000 |
| 28 | #define A3700_SPI_MAX_PRESCALE 30 |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 29 | #define A3700_SPI_TIMEOUT 10 |
| 30 | |
| 31 | /* SPI Register Offest */ |
| 32 | #define A3700_SPI_IF_CTRL_REG 0x00 |
| 33 | #define A3700_SPI_IF_CFG_REG 0x04 |
| 34 | #define A3700_SPI_DATA_OUT_REG 0x08 |
| 35 | #define A3700_SPI_DATA_IN_REG 0x0C |
| 36 | #define A3700_SPI_IF_INST_REG 0x10 |
| 37 | #define A3700_SPI_IF_ADDR_REG 0x14 |
| 38 | #define A3700_SPI_IF_RMODE_REG 0x18 |
| 39 | #define A3700_SPI_IF_HDR_CNT_REG 0x1C |
| 40 | #define A3700_SPI_IF_DIN_CNT_REG 0x20 |
| 41 | #define A3700_SPI_IF_TIME_REG 0x24 |
| 42 | #define A3700_SPI_INT_STAT_REG 0x28 |
| 43 | #define A3700_SPI_INT_MASK_REG 0x2C |
| 44 | |
| 45 | /* A3700_SPI_IF_CTRL_REG */ |
| 46 | #define A3700_SPI_EN BIT(16) |
| 47 | #define A3700_SPI_ADDR_NOT_CONFIG BIT(12) |
| 48 | #define A3700_SPI_WFIFO_OVERFLOW BIT(11) |
| 49 | #define A3700_SPI_WFIFO_UNDERFLOW BIT(10) |
| 50 | #define A3700_SPI_RFIFO_OVERFLOW BIT(9) |
| 51 | #define A3700_SPI_RFIFO_UNDERFLOW BIT(8) |
| 52 | #define A3700_SPI_WFIFO_FULL BIT(7) |
| 53 | #define A3700_SPI_WFIFO_EMPTY BIT(6) |
| 54 | #define A3700_SPI_RFIFO_FULL BIT(5) |
| 55 | #define A3700_SPI_RFIFO_EMPTY BIT(4) |
| 56 | #define A3700_SPI_WFIFO_RDY BIT(3) |
| 57 | #define A3700_SPI_RFIFO_RDY BIT(2) |
| 58 | #define A3700_SPI_XFER_RDY BIT(1) |
| 59 | #define A3700_SPI_XFER_DONE BIT(0) |
| 60 | |
| 61 | /* A3700_SPI_IF_CFG_REG */ |
| 62 | #define A3700_SPI_WFIFO_THRS BIT(28) |
| 63 | #define A3700_SPI_RFIFO_THRS BIT(24) |
| 64 | #define A3700_SPI_AUTO_CS BIT(20) |
| 65 | #define A3700_SPI_DMA_RD_EN BIT(18) |
| 66 | #define A3700_SPI_FIFO_MODE BIT(17) |
| 67 | #define A3700_SPI_SRST BIT(16) |
| 68 | #define A3700_SPI_XFER_START BIT(15) |
| 69 | #define A3700_SPI_XFER_STOP BIT(14) |
| 70 | #define A3700_SPI_INST_PIN BIT(13) |
| 71 | #define A3700_SPI_ADDR_PIN BIT(12) |
| 72 | #define A3700_SPI_DATA_PIN1 BIT(11) |
| 73 | #define A3700_SPI_DATA_PIN0 BIT(10) |
| 74 | #define A3700_SPI_FIFO_FLUSH BIT(9) |
| 75 | #define A3700_SPI_RW_EN BIT(8) |
| 76 | #define A3700_SPI_CLK_POL BIT(7) |
| 77 | #define A3700_SPI_CLK_PHA BIT(6) |
| 78 | #define A3700_SPI_BYTE_LEN BIT(5) |
| 79 | #define A3700_SPI_CLK_PRESCALE BIT(0) |
| 80 | #define A3700_SPI_CLK_PRESCALE_MASK (0x1f) |
Maxime Chevallier | 251c201 | 2017-11-27 15:16:32 +0100 | [diff] [blame] | 81 | #define A3700_SPI_CLK_EVEN_OFFS (0x10) |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 82 | |
| 83 | #define A3700_SPI_WFIFO_THRS_BIT 28 |
| 84 | #define A3700_SPI_RFIFO_THRS_BIT 24 |
| 85 | #define A3700_SPI_FIFO_THRS_MASK 0x7 |
| 86 | |
| 87 | #define A3700_SPI_DATA_PIN_MASK 0x3 |
| 88 | |
| 89 | /* A3700_SPI_IF_HDR_CNT_REG */ |
| 90 | #define A3700_SPI_DUMMY_CNT_BIT 12 |
| 91 | #define A3700_SPI_DUMMY_CNT_MASK 0x7 |
| 92 | #define A3700_SPI_RMODE_CNT_BIT 8 |
| 93 | #define A3700_SPI_RMODE_CNT_MASK 0x3 |
| 94 | #define A3700_SPI_ADDR_CNT_BIT 4 |
| 95 | #define A3700_SPI_ADDR_CNT_MASK 0x7 |
| 96 | #define A3700_SPI_INSTR_CNT_BIT 0 |
| 97 | #define A3700_SPI_INSTR_CNT_MASK 0x3 |
| 98 | |
| 99 | /* A3700_SPI_IF_TIME_REG */ |
| 100 | #define A3700_SPI_CLK_CAPT_EDGE BIT(7) |
| 101 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 102 | struct a3700_spi { |
| 103 | struct spi_master *master; |
| 104 | void __iomem *base; |
| 105 | struct clk *clk; |
| 106 | unsigned int irq; |
| 107 | unsigned int flags; |
| 108 | bool xmit_data; |
| 109 | const u8 *tx_buf; |
| 110 | u8 *rx_buf; |
| 111 | size_t buf_len; |
| 112 | u8 byte_len; |
| 113 | u32 wait_mask; |
| 114 | struct completion done; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 115 | }; |
| 116 | |
| 117 | static u32 spireg_read(struct a3700_spi *a3700_spi, u32 offset) |
| 118 | { |
| 119 | return readl(a3700_spi->base + offset); |
| 120 | } |
| 121 | |
| 122 | static void spireg_write(struct a3700_spi *a3700_spi, u32 offset, u32 data) |
| 123 | { |
| 124 | writel(data, a3700_spi->base + offset); |
| 125 | } |
| 126 | |
| 127 | static void a3700_spi_auto_cs_unset(struct a3700_spi *a3700_spi) |
| 128 | { |
| 129 | u32 val; |
| 130 | |
| 131 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 132 | val &= ~A3700_SPI_AUTO_CS; |
| 133 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 134 | } |
| 135 | |
| 136 | static void a3700_spi_activate_cs(struct a3700_spi *a3700_spi, unsigned int cs) |
| 137 | { |
| 138 | u32 val; |
| 139 | |
| 140 | val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); |
| 141 | val |= (A3700_SPI_EN << cs); |
| 142 | spireg_write(a3700_spi, A3700_SPI_IF_CTRL_REG, val); |
| 143 | } |
| 144 | |
| 145 | static void a3700_spi_deactivate_cs(struct a3700_spi *a3700_spi, |
| 146 | unsigned int cs) |
| 147 | { |
| 148 | u32 val; |
| 149 | |
| 150 | val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); |
| 151 | val &= ~(A3700_SPI_EN << cs); |
| 152 | spireg_write(a3700_spi, A3700_SPI_IF_CTRL_REG, val); |
| 153 | } |
| 154 | |
| 155 | static int a3700_spi_pin_mode_set(struct a3700_spi *a3700_spi, |
Miquel Raynal | 747e1f6 | 2017-09-13 18:21:38 +0200 | [diff] [blame] | 156 | unsigned int pin_mode, bool receiving) |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 157 | { |
| 158 | u32 val; |
| 159 | |
| 160 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 161 | val &= ~(A3700_SPI_INST_PIN | A3700_SPI_ADDR_PIN); |
| 162 | val &= ~(A3700_SPI_DATA_PIN0 | A3700_SPI_DATA_PIN1); |
| 163 | |
| 164 | switch (pin_mode) { |
Romain Perier | cfd6693 | 2016-12-21 11:10:30 +0100 | [diff] [blame] | 165 | case SPI_NBITS_SINGLE: |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 166 | break; |
Romain Perier | cfd6693 | 2016-12-21 11:10:30 +0100 | [diff] [blame] | 167 | case SPI_NBITS_DUAL: |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 168 | val |= A3700_SPI_DATA_PIN0; |
| 169 | break; |
Romain Perier | cfd6693 | 2016-12-21 11:10:30 +0100 | [diff] [blame] | 170 | case SPI_NBITS_QUAD: |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 171 | val |= A3700_SPI_DATA_PIN1; |
Miquel Raynal | 747e1f6 | 2017-09-13 18:21:38 +0200 | [diff] [blame] | 172 | /* RX during address reception uses 4-pin */ |
| 173 | if (receiving) |
| 174 | val |= A3700_SPI_ADDR_PIN; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 175 | break; |
| 176 | default: |
| 177 | dev_err(&a3700_spi->master->dev, "wrong pin mode %u", pin_mode); |
| 178 | return -EINVAL; |
| 179 | } |
| 180 | |
| 181 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
Maxime Chevallier | a456c93 | 2018-01-17 17:15:27 +0100 | [diff] [blame] | 186 | static void a3700_spi_fifo_mode_set(struct a3700_spi *a3700_spi, bool enable) |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 187 | { |
| 188 | u32 val; |
| 189 | |
| 190 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
Maxime Chevallier | a456c93 | 2018-01-17 17:15:27 +0100 | [diff] [blame] | 191 | if (enable) |
| 192 | val |= A3700_SPI_FIFO_MODE; |
| 193 | else |
| 194 | val &= ~A3700_SPI_FIFO_MODE; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 195 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 196 | } |
| 197 | |
| 198 | static void a3700_spi_mode_set(struct a3700_spi *a3700_spi, |
| 199 | unsigned int mode_bits) |
| 200 | { |
| 201 | u32 val; |
| 202 | |
| 203 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 204 | |
| 205 | if (mode_bits & SPI_CPOL) |
| 206 | val |= A3700_SPI_CLK_POL; |
| 207 | else |
| 208 | val &= ~A3700_SPI_CLK_POL; |
| 209 | |
| 210 | if (mode_bits & SPI_CPHA) |
| 211 | val |= A3700_SPI_CLK_PHA; |
| 212 | else |
| 213 | val &= ~A3700_SPI_CLK_PHA; |
| 214 | |
| 215 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 216 | } |
| 217 | |
| 218 | static void a3700_spi_clock_set(struct a3700_spi *a3700_spi, |
Maxime Chevallier | dd7aa8d | 2017-10-10 10:43:18 +0200 | [diff] [blame] | 219 | unsigned int speed_hz) |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 220 | { |
| 221 | u32 val; |
| 222 | u32 prescale; |
| 223 | |
| 224 | prescale = DIV_ROUND_UP(clk_get_rate(a3700_spi->clk), speed_hz); |
| 225 | |
Maxime Chevallier | 251c201 | 2017-11-27 15:16:32 +0100 | [diff] [blame] | 226 | /* For prescaler values over 15, we can only set it by steps of 2. |
| 227 | * Starting from A3700_SPI_CLK_EVEN_OFFS, we set values from 0 up to |
| 228 | * 30. We only use this range from 16 to 30. |
| 229 | */ |
| 230 | if (prescale > 15) |
| 231 | prescale = A3700_SPI_CLK_EVEN_OFFS + DIV_ROUND_UP(prescale, 2); |
| 232 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 233 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 234 | val = val & ~A3700_SPI_CLK_PRESCALE_MASK; |
| 235 | |
| 236 | val = val | (prescale & A3700_SPI_CLK_PRESCALE_MASK); |
| 237 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 238 | |
| 239 | if (prescale <= 2) { |
| 240 | val = spireg_read(a3700_spi, A3700_SPI_IF_TIME_REG); |
| 241 | val |= A3700_SPI_CLK_CAPT_EDGE; |
| 242 | spireg_write(a3700_spi, A3700_SPI_IF_TIME_REG, val); |
| 243 | } |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | static void a3700_spi_bytelen_set(struct a3700_spi *a3700_spi, unsigned int len) |
| 247 | { |
| 248 | u32 val; |
| 249 | |
| 250 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 251 | if (len == 4) |
| 252 | val |= A3700_SPI_BYTE_LEN; |
| 253 | else |
| 254 | val &= ~A3700_SPI_BYTE_LEN; |
| 255 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 256 | |
| 257 | a3700_spi->byte_len = len; |
| 258 | } |
| 259 | |
| 260 | static int a3700_spi_fifo_flush(struct a3700_spi *a3700_spi) |
| 261 | { |
| 262 | int timeout = A3700_SPI_TIMEOUT; |
| 263 | u32 val; |
| 264 | |
| 265 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 266 | val |= A3700_SPI_FIFO_FLUSH; |
| 267 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 268 | |
| 269 | while (--timeout) { |
| 270 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 271 | if (!(val & A3700_SPI_FIFO_FLUSH)) |
| 272 | return 0; |
| 273 | udelay(1); |
| 274 | } |
| 275 | |
| 276 | return -ETIMEDOUT; |
| 277 | } |
| 278 | |
| 279 | static int a3700_spi_init(struct a3700_spi *a3700_spi) |
| 280 | { |
| 281 | struct spi_master *master = a3700_spi->master; |
| 282 | u32 val; |
| 283 | int i, ret = 0; |
| 284 | |
| 285 | /* Reset SPI unit */ |
| 286 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 287 | val |= A3700_SPI_SRST; |
| 288 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 289 | |
| 290 | udelay(A3700_SPI_TIMEOUT); |
| 291 | |
| 292 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 293 | val &= ~A3700_SPI_SRST; |
| 294 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 295 | |
| 296 | /* Disable AUTO_CS and deactivate all chip-selects */ |
| 297 | a3700_spi_auto_cs_unset(a3700_spi); |
| 298 | for (i = 0; i < master->num_chipselect; i++) |
| 299 | a3700_spi_deactivate_cs(a3700_spi, i); |
| 300 | |
| 301 | /* Enable FIFO mode */ |
Maxime Chevallier | a456c93 | 2018-01-17 17:15:27 +0100 | [diff] [blame] | 302 | a3700_spi_fifo_mode_set(a3700_spi, true); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 303 | |
| 304 | /* Set SPI mode */ |
| 305 | a3700_spi_mode_set(a3700_spi, master->mode_bits); |
| 306 | |
| 307 | /* Reset counters */ |
| 308 | spireg_write(a3700_spi, A3700_SPI_IF_HDR_CNT_REG, 0); |
| 309 | spireg_write(a3700_spi, A3700_SPI_IF_DIN_CNT_REG, 0); |
| 310 | |
| 311 | /* Mask the interrupts and clear cause bits */ |
| 312 | spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, 0); |
| 313 | spireg_write(a3700_spi, A3700_SPI_INT_STAT_REG, ~0U); |
| 314 | |
| 315 | return ret; |
| 316 | } |
| 317 | |
| 318 | static irqreturn_t a3700_spi_interrupt(int irq, void *dev_id) |
| 319 | { |
| 320 | struct spi_master *master = dev_id; |
| 321 | struct a3700_spi *a3700_spi; |
| 322 | u32 cause; |
| 323 | |
| 324 | a3700_spi = spi_master_get_devdata(master); |
| 325 | |
| 326 | /* Get interrupt causes */ |
| 327 | cause = spireg_read(a3700_spi, A3700_SPI_INT_STAT_REG); |
| 328 | |
| 329 | if (!cause || !(a3700_spi->wait_mask & cause)) |
| 330 | return IRQ_NONE; |
| 331 | |
| 332 | /* mask and acknowledge the SPI interrupts */ |
| 333 | spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, 0); |
| 334 | spireg_write(a3700_spi, A3700_SPI_INT_STAT_REG, cause); |
| 335 | |
| 336 | /* Wake up the transfer */ |
Dan Carpenter | 0cc059a | 2016-12-16 12:33:59 +0300 | [diff] [blame] | 337 | complete(&a3700_spi->done); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 338 | |
| 339 | return IRQ_HANDLED; |
| 340 | } |
| 341 | |
| 342 | static bool a3700_spi_wait_completion(struct spi_device *spi) |
| 343 | { |
| 344 | struct a3700_spi *a3700_spi; |
| 345 | unsigned int timeout; |
| 346 | unsigned int ctrl_reg; |
| 347 | unsigned long timeout_jiffies; |
| 348 | |
| 349 | a3700_spi = spi_master_get_devdata(spi->master); |
| 350 | |
| 351 | /* SPI interrupt is edge-triggered, which means an interrupt will |
| 352 | * be generated only when detecting a specific status bit changed |
| 353 | * from '0' to '1'. So when we start waiting for a interrupt, we |
| 354 | * need to check status bit in control reg first, if it is already 1, |
| 355 | * then we do not need to wait for interrupt |
| 356 | */ |
| 357 | ctrl_reg = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); |
| 358 | if (a3700_spi->wait_mask & ctrl_reg) |
| 359 | return true; |
| 360 | |
| 361 | reinit_completion(&a3700_spi->done); |
| 362 | |
| 363 | spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, |
| 364 | a3700_spi->wait_mask); |
| 365 | |
| 366 | timeout_jiffies = msecs_to_jiffies(A3700_SPI_TIMEOUT); |
| 367 | timeout = wait_for_completion_timeout(&a3700_spi->done, |
| 368 | timeout_jiffies); |
| 369 | |
| 370 | a3700_spi->wait_mask = 0; |
| 371 | |
| 372 | if (timeout) |
| 373 | return true; |
| 374 | |
| 375 | /* there might be the case that right after we checked the |
| 376 | * status bits in this routine and before start to wait for |
| 377 | * interrupt by wait_for_completion_timeout, the interrupt |
| 378 | * happens, to avoid missing it we need to double check |
| 379 | * status bits in control reg, if it is already 1, then |
| 380 | * consider that we have the interrupt successfully and |
| 381 | * return true. |
| 382 | */ |
| 383 | ctrl_reg = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); |
| 384 | if (a3700_spi->wait_mask & ctrl_reg) |
| 385 | return true; |
| 386 | |
| 387 | spireg_write(a3700_spi, A3700_SPI_INT_MASK_REG, 0); |
| 388 | |
Maxime Chevallier | 5a866ec | 2017-10-10 10:43:17 +0200 | [diff] [blame] | 389 | /* Timeout was reached */ |
| 390 | return false; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | static bool a3700_spi_transfer_wait(struct spi_device *spi, |
| 394 | unsigned int bit_mask) |
| 395 | { |
| 396 | struct a3700_spi *a3700_spi; |
| 397 | |
| 398 | a3700_spi = spi_master_get_devdata(spi->master); |
| 399 | a3700_spi->wait_mask = bit_mask; |
| 400 | |
| 401 | return a3700_spi_wait_completion(spi); |
| 402 | } |
| 403 | |
| 404 | static void a3700_spi_fifo_thres_set(struct a3700_spi *a3700_spi, |
| 405 | unsigned int bytes) |
| 406 | { |
| 407 | u32 val; |
| 408 | |
| 409 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 410 | val &= ~(A3700_SPI_FIFO_THRS_MASK << A3700_SPI_RFIFO_THRS_BIT); |
| 411 | val |= (bytes - 1) << A3700_SPI_RFIFO_THRS_BIT; |
| 412 | val &= ~(A3700_SPI_FIFO_THRS_MASK << A3700_SPI_WFIFO_THRS_BIT); |
| 413 | val |= (7 - bytes) << A3700_SPI_WFIFO_THRS_BIT; |
| 414 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 415 | } |
| 416 | |
| 417 | static void a3700_spi_transfer_setup(struct spi_device *spi, |
Romain Perier | 85798e15 | 2016-12-21 11:10:29 +0100 | [diff] [blame] | 418 | struct spi_transfer *xfer) |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 419 | { |
| 420 | struct a3700_spi *a3700_spi; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 421 | |
| 422 | a3700_spi = spi_master_get_devdata(spi->master); |
| 423 | |
Maxime Chevallier | dd7aa8d | 2017-10-10 10:43:18 +0200 | [diff] [blame] | 424 | a3700_spi_clock_set(a3700_spi, xfer->speed_hz); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 425 | |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 426 | /* Use 4 bytes long transfers. Each transfer method has its way to deal |
| 427 | * with the remaining bytes for non 4-bytes aligned transfers. |
| 428 | */ |
| 429 | a3700_spi_bytelen_set(a3700_spi, 4); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 430 | |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 431 | /* Initialize the working buffers */ |
| 432 | a3700_spi->tx_buf = xfer->tx_buf; |
| 433 | a3700_spi->rx_buf = xfer->rx_buf; |
| 434 | a3700_spi->buf_len = xfer->len; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | static void a3700_spi_set_cs(struct spi_device *spi, bool enable) |
| 438 | { |
| 439 | struct a3700_spi *a3700_spi = spi_master_get_devdata(spi->master); |
| 440 | |
| 441 | if (!enable) |
| 442 | a3700_spi_activate_cs(a3700_spi, spi->chip_select); |
| 443 | else |
| 444 | a3700_spi_deactivate_cs(a3700_spi, spi->chip_select); |
| 445 | } |
| 446 | |
| 447 | static void a3700_spi_header_set(struct a3700_spi *a3700_spi) |
| 448 | { |
Zachary Zhang | 6fd6fd6 | 2017-09-13 18:21:39 +0200 | [diff] [blame] | 449 | unsigned int addr_cnt; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 450 | u32 val = 0; |
| 451 | |
| 452 | /* Clear the header registers */ |
| 453 | spireg_write(a3700_spi, A3700_SPI_IF_INST_REG, 0); |
| 454 | spireg_write(a3700_spi, A3700_SPI_IF_ADDR_REG, 0); |
| 455 | spireg_write(a3700_spi, A3700_SPI_IF_RMODE_REG, 0); |
Zachary Zhang | 6fd6fd6 | 2017-09-13 18:21:39 +0200 | [diff] [blame] | 456 | spireg_write(a3700_spi, A3700_SPI_IF_HDR_CNT_REG, 0); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 457 | |
| 458 | /* Set header counters */ |
| 459 | if (a3700_spi->tx_buf) { |
Zachary Zhang | 6fd6fd6 | 2017-09-13 18:21:39 +0200 | [diff] [blame] | 460 | /* |
| 461 | * when tx data is not 4 bytes aligned, there will be unexpected |
| 462 | * bytes out of SPI output register, since it always shifts out |
| 463 | * as whole 4 bytes. This might cause incorrect transaction with |
| 464 | * some devices. To avoid that, use SPI header count feature to |
| 465 | * transfer up to 3 bytes of data first, and then make the rest |
| 466 | * of data 4-byte aligned. |
| 467 | */ |
| 468 | addr_cnt = a3700_spi->buf_len % 4; |
| 469 | if (addr_cnt) { |
| 470 | val = (addr_cnt & A3700_SPI_ADDR_CNT_MASK) |
| 471 | << A3700_SPI_ADDR_CNT_BIT; |
| 472 | spireg_write(a3700_spi, A3700_SPI_IF_HDR_CNT_REG, val); |
| 473 | |
| 474 | /* Update the buffer length to be transferred */ |
| 475 | a3700_spi->buf_len -= addr_cnt; |
| 476 | |
| 477 | /* transfer 1~3 bytes through address count */ |
| 478 | val = 0; |
| 479 | while (addr_cnt--) { |
| 480 | val = (val << 8) | a3700_spi->tx_buf[0]; |
| 481 | a3700_spi->tx_buf++; |
| 482 | } |
| 483 | spireg_write(a3700_spi, A3700_SPI_IF_ADDR_REG, val); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 484 | } |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 485 | } |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | static int a3700_is_wfifo_full(struct a3700_spi *a3700_spi) |
| 489 | { |
| 490 | u32 val; |
| 491 | |
| 492 | val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); |
| 493 | return (val & A3700_SPI_WFIFO_FULL); |
| 494 | } |
| 495 | |
| 496 | static int a3700_spi_fifo_write(struct a3700_spi *a3700_spi) |
| 497 | { |
| 498 | u32 val; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 499 | |
| 500 | while (!a3700_is_wfifo_full(a3700_spi) && a3700_spi->buf_len) { |
Maxime Chevallier | 162f8de | 2018-01-24 15:10:47 +0100 | [diff] [blame] | 501 | val = *(u32 *)a3700_spi->tx_buf; |
Zachary Zhang | 6fd6fd6 | 2017-09-13 18:21:39 +0200 | [diff] [blame] | 502 | spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, val); |
| 503 | a3700_spi->buf_len -= 4; |
| 504 | a3700_spi->tx_buf += 4; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | return 0; |
| 508 | } |
| 509 | |
| 510 | static int a3700_is_rfifo_empty(struct a3700_spi *a3700_spi) |
| 511 | { |
| 512 | u32 val = spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG); |
| 513 | |
| 514 | return (val & A3700_SPI_RFIFO_EMPTY); |
| 515 | } |
| 516 | |
| 517 | static int a3700_spi_fifo_read(struct a3700_spi *a3700_spi) |
| 518 | { |
| 519 | u32 val; |
| 520 | |
| 521 | while (!a3700_is_rfifo_empty(a3700_spi) && a3700_spi->buf_len) { |
| 522 | val = spireg_read(a3700_spi, A3700_SPI_DATA_IN_REG); |
| 523 | if (a3700_spi->buf_len >= 4) { |
Romain Perier | 85798e15 | 2016-12-21 11:10:29 +0100 | [diff] [blame] | 524 | |
Maxime Chevallier | 162f8de | 2018-01-24 15:10:47 +0100 | [diff] [blame] | 525 | memcpy(a3700_spi->rx_buf, &val, 4); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 526 | |
| 527 | a3700_spi->buf_len -= 4; |
| 528 | a3700_spi->rx_buf += 4; |
| 529 | } else { |
| 530 | /* |
| 531 | * When remain bytes is not larger than 4, we should |
| 532 | * avoid memory overwriting and just write the left rx |
| 533 | * buffer bytes. |
| 534 | */ |
| 535 | while (a3700_spi->buf_len) { |
| 536 | *a3700_spi->rx_buf = val & 0xff; |
| 537 | val >>= 8; |
| 538 | |
| 539 | a3700_spi->buf_len--; |
| 540 | a3700_spi->rx_buf++; |
| 541 | } |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | static void a3700_spi_transfer_abort_fifo(struct a3700_spi *a3700_spi) |
| 549 | { |
| 550 | int timeout = A3700_SPI_TIMEOUT; |
| 551 | u32 val; |
| 552 | |
| 553 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 554 | val |= A3700_SPI_XFER_STOP; |
| 555 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 556 | |
| 557 | while (--timeout) { |
| 558 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 559 | if (!(val & A3700_SPI_XFER_START)) |
| 560 | break; |
| 561 | udelay(1); |
| 562 | } |
| 563 | |
| 564 | a3700_spi_fifo_flush(a3700_spi); |
| 565 | |
| 566 | val &= ~A3700_SPI_XFER_STOP; |
| 567 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 568 | } |
| 569 | |
| 570 | static int a3700_spi_prepare_message(struct spi_master *master, |
| 571 | struct spi_message *message) |
| 572 | { |
| 573 | struct a3700_spi *a3700_spi = spi_master_get_devdata(master); |
| 574 | struct spi_device *spi = message->spi; |
| 575 | int ret; |
| 576 | |
| 577 | ret = clk_enable(a3700_spi->clk); |
| 578 | if (ret) { |
| 579 | dev_err(&spi->dev, "failed to enable clk with error %d\n", ret); |
| 580 | return ret; |
| 581 | } |
| 582 | |
| 583 | /* Flush the FIFOs */ |
| 584 | ret = a3700_spi_fifo_flush(a3700_spi); |
| 585 | if (ret) |
| 586 | return ret; |
| 587 | |
Maxime Chevallier | dd7aa8d | 2017-10-10 10:43:18 +0200 | [diff] [blame] | 588 | a3700_spi_mode_set(a3700_spi, spi->mode); |
| 589 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 590 | return 0; |
| 591 | } |
| 592 | |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 593 | static int a3700_spi_transfer_one_fifo(struct spi_master *master, |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 594 | struct spi_device *spi, |
| 595 | struct spi_transfer *xfer) |
| 596 | { |
| 597 | struct a3700_spi *a3700_spi = spi_master_get_devdata(master); |
| 598 | int ret = 0, timeout = A3700_SPI_TIMEOUT; |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 599 | unsigned int nbits = 0, byte_len; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 600 | u32 val; |
| 601 | |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 602 | /* Make sure we use FIFO mode */ |
| 603 | a3700_spi_fifo_mode_set(a3700_spi, true); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 604 | |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 605 | /* Configure FIFO thresholds */ |
| 606 | byte_len = xfer->bits_per_word >> 3; |
| 607 | a3700_spi_fifo_thres_set(a3700_spi, byte_len); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 608 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 609 | if (xfer->tx_buf) |
| 610 | nbits = xfer->tx_nbits; |
| 611 | else if (xfer->rx_buf) |
| 612 | nbits = xfer->rx_nbits; |
| 613 | |
Miquel Raynal | 747e1f6 | 2017-09-13 18:21:38 +0200 | [diff] [blame] | 614 | a3700_spi_pin_mode_set(a3700_spi, nbits, xfer->rx_buf ? true : false); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 615 | |
Zachary Zhang | 6fd6fd6 | 2017-09-13 18:21:39 +0200 | [diff] [blame] | 616 | /* Flush the FIFOs */ |
| 617 | a3700_spi_fifo_flush(a3700_spi); |
| 618 | |
| 619 | /* Transfer first bytes of data when buffer is not 4-byte aligned */ |
| 620 | a3700_spi_header_set(a3700_spi); |
| 621 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 622 | if (xfer->rx_buf) { |
Maxime Chevallier | 44a5f42 | 2018-01-17 17:15:25 +0100 | [diff] [blame] | 623 | /* Clear WFIFO, since it's last 2 bytes are shifted out during |
| 624 | * a read operation |
| 625 | */ |
| 626 | spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, 0); |
| 627 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 628 | /* Set read data length */ |
| 629 | spireg_write(a3700_spi, A3700_SPI_IF_DIN_CNT_REG, |
| 630 | a3700_spi->buf_len); |
| 631 | /* Start READ transfer */ |
| 632 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 633 | val &= ~A3700_SPI_RW_EN; |
| 634 | val |= A3700_SPI_XFER_START; |
| 635 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 636 | } else if (xfer->tx_buf) { |
| 637 | /* Start Write transfer */ |
| 638 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 639 | val |= (A3700_SPI_XFER_START | A3700_SPI_RW_EN); |
| 640 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 641 | |
| 642 | /* |
| 643 | * If there are data to be written to the SPI device, xmit_data |
| 644 | * flag is set true; otherwise the instruction in SPI_INSTR does |
| 645 | * not require data to be written to the SPI device, then |
| 646 | * xmit_data flag is set false. |
| 647 | */ |
| 648 | a3700_spi->xmit_data = (a3700_spi->buf_len != 0); |
| 649 | } |
| 650 | |
| 651 | while (a3700_spi->buf_len) { |
| 652 | if (a3700_spi->tx_buf) { |
| 653 | /* Wait wfifo ready */ |
| 654 | if (!a3700_spi_transfer_wait(spi, |
| 655 | A3700_SPI_WFIFO_RDY)) { |
| 656 | dev_err(&spi->dev, |
| 657 | "wait wfifo ready timed out\n"); |
| 658 | ret = -ETIMEDOUT; |
| 659 | goto error; |
| 660 | } |
| 661 | /* Fill up the wfifo */ |
| 662 | ret = a3700_spi_fifo_write(a3700_spi); |
| 663 | if (ret) |
| 664 | goto error; |
| 665 | } else if (a3700_spi->rx_buf) { |
| 666 | /* Wait rfifo ready */ |
| 667 | if (!a3700_spi_transfer_wait(spi, |
| 668 | A3700_SPI_RFIFO_RDY)) { |
| 669 | dev_err(&spi->dev, |
| 670 | "wait rfifo ready timed out\n"); |
| 671 | ret = -ETIMEDOUT; |
| 672 | goto error; |
| 673 | } |
| 674 | /* Drain out the rfifo */ |
| 675 | ret = a3700_spi_fifo_read(a3700_spi); |
| 676 | if (ret) |
| 677 | goto error; |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /* |
| 682 | * Stop a write transfer in fifo mode: |
| 683 | * - wait all the bytes in wfifo to be shifted out |
| 684 | * - set XFER_STOP bit |
| 685 | * - wait XFER_START bit clear |
| 686 | * - clear XFER_STOP bit |
| 687 | * Stop a read transfer in fifo mode: |
| 688 | * - the hardware is to reset the XFER_START bit |
| 689 | * after the number of bytes indicated in DIN_CNT |
| 690 | * register |
| 691 | * - just wait XFER_START bit clear |
| 692 | */ |
| 693 | if (a3700_spi->tx_buf) { |
| 694 | if (a3700_spi->xmit_data) { |
| 695 | /* |
| 696 | * If there are data written to the SPI device, wait |
| 697 | * until SPI_WFIFO_EMPTY is 1 to wait for all data to |
| 698 | * transfer out of write FIFO. |
| 699 | */ |
| 700 | if (!a3700_spi_transfer_wait(spi, |
| 701 | A3700_SPI_WFIFO_EMPTY)) { |
| 702 | dev_err(&spi->dev, "wait wfifo empty timed out\n"); |
| 703 | return -ETIMEDOUT; |
| 704 | } |
Zachary Zhang | 6fd6fd6 | 2017-09-13 18:21:39 +0200 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | if (!a3700_spi_transfer_wait(spi, A3700_SPI_XFER_RDY)) { |
| 708 | dev_err(&spi->dev, "wait xfer ready timed out\n"); |
| 709 | return -ETIMEDOUT; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 710 | } |
| 711 | |
| 712 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 713 | val |= A3700_SPI_XFER_STOP; |
| 714 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 715 | } |
| 716 | |
| 717 | while (--timeout) { |
| 718 | val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); |
| 719 | if (!(val & A3700_SPI_XFER_START)) |
| 720 | break; |
| 721 | udelay(1); |
| 722 | } |
| 723 | |
| 724 | if (timeout == 0) { |
| 725 | dev_err(&spi->dev, "wait transfer start clear timed out\n"); |
| 726 | ret = -ETIMEDOUT; |
| 727 | goto error; |
| 728 | } |
| 729 | |
| 730 | val &= ~A3700_SPI_XFER_STOP; |
| 731 | spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); |
| 732 | goto out; |
| 733 | |
| 734 | error: |
| 735 | a3700_spi_transfer_abort_fifo(a3700_spi); |
| 736 | out: |
| 737 | spi_finalize_current_transfer(master); |
| 738 | |
| 739 | return ret; |
| 740 | } |
| 741 | |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 742 | static int a3700_spi_transfer_one_full_duplex(struct spi_master *master, |
| 743 | struct spi_device *spi, |
| 744 | struct spi_transfer *xfer) |
| 745 | { |
| 746 | struct a3700_spi *a3700_spi = spi_master_get_devdata(master); |
Maxime Chevallier | 34b1fca | 2018-01-24 15:10:48 +0100 | [diff] [blame] | 747 | u32 val; |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 748 | |
| 749 | /* Disable FIFO mode */ |
| 750 | a3700_spi_fifo_mode_set(a3700_spi, false); |
| 751 | |
| 752 | while (a3700_spi->buf_len) { |
| 753 | |
| 754 | /* When we have less than 4 bytes to transfer, switch to 1 byte |
| 755 | * mode. This is reset after each transfer |
| 756 | */ |
| 757 | if (a3700_spi->buf_len < 4) |
| 758 | a3700_spi_bytelen_set(a3700_spi, 1); |
| 759 | |
| 760 | if (a3700_spi->byte_len == 1) |
Maxime Chevallier | 34b1fca | 2018-01-24 15:10:48 +0100 | [diff] [blame] | 761 | val = *a3700_spi->tx_buf; |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 762 | else |
Maxime Chevallier | 34b1fca | 2018-01-24 15:10:48 +0100 | [diff] [blame] | 763 | val = *(u32 *)a3700_spi->tx_buf; |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 764 | |
Maxime Chevallier | 34b1fca | 2018-01-24 15:10:48 +0100 | [diff] [blame] | 765 | spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, val); |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 766 | |
| 767 | /* Wait for all the data to be shifted in / out */ |
| 768 | while (!(spireg_read(a3700_spi, A3700_SPI_IF_CTRL_REG) & |
| 769 | A3700_SPI_XFER_DONE)) |
| 770 | cpu_relax(); |
| 771 | |
Maxime Chevallier | 34b1fca | 2018-01-24 15:10:48 +0100 | [diff] [blame] | 772 | val = spireg_read(a3700_spi, A3700_SPI_DATA_IN_REG); |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 773 | |
Maxime Chevallier | 34b1fca | 2018-01-24 15:10:48 +0100 | [diff] [blame] | 774 | memcpy(a3700_spi->rx_buf, &val, a3700_spi->byte_len); |
Maxime Chevallier | f68a7dc | 2018-01-17 17:15:28 +0100 | [diff] [blame] | 775 | |
| 776 | a3700_spi->buf_len -= a3700_spi->byte_len; |
| 777 | a3700_spi->tx_buf += a3700_spi->byte_len; |
| 778 | a3700_spi->rx_buf += a3700_spi->byte_len; |
| 779 | |
| 780 | } |
| 781 | |
| 782 | spi_finalize_current_transfer(master); |
| 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | static int a3700_spi_transfer_one(struct spi_master *master, |
| 788 | struct spi_device *spi, |
| 789 | struct spi_transfer *xfer) |
| 790 | { |
| 791 | a3700_spi_transfer_setup(spi, xfer); |
| 792 | |
| 793 | if (xfer->tx_buf && xfer->rx_buf) |
| 794 | return a3700_spi_transfer_one_full_duplex(master, spi, xfer); |
| 795 | |
| 796 | return a3700_spi_transfer_one_fifo(master, spi, xfer); |
| 797 | } |
| 798 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 799 | static int a3700_spi_unprepare_message(struct spi_master *master, |
| 800 | struct spi_message *message) |
| 801 | { |
| 802 | struct a3700_spi *a3700_spi = spi_master_get_devdata(master); |
| 803 | |
| 804 | clk_disable(a3700_spi->clk); |
| 805 | |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | static const struct of_device_id a3700_spi_dt_ids[] = { |
| 810 | { .compatible = "marvell,armada-3700-spi", .data = NULL }, |
| 811 | {}, |
| 812 | }; |
| 813 | |
| 814 | MODULE_DEVICE_TABLE(of, a3700_spi_dt_ids); |
| 815 | |
| 816 | static int a3700_spi_probe(struct platform_device *pdev) |
| 817 | { |
| 818 | struct device *dev = &pdev->dev; |
| 819 | struct device_node *of_node = dev->of_node; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 820 | struct spi_master *master; |
| 821 | struct a3700_spi *spi; |
| 822 | u32 num_cs = 0; |
Colin Ian King | f6f0083 | 2016-12-13 10:28:12 +0000 | [diff] [blame] | 823 | int irq, ret = 0; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 824 | |
| 825 | master = spi_alloc_master(dev, sizeof(*spi)); |
| 826 | if (!master) { |
| 827 | dev_err(dev, "master allocation failed\n"); |
| 828 | ret = -ENOMEM; |
| 829 | goto out; |
| 830 | } |
| 831 | |
| 832 | if (of_property_read_u32(of_node, "num-cs", &num_cs)) { |
| 833 | dev_err(dev, "could not find num-cs\n"); |
| 834 | ret = -ENXIO; |
| 835 | goto error; |
| 836 | } |
| 837 | |
| 838 | master->bus_num = pdev->id; |
| 839 | master->dev.of_node = of_node; |
| 840 | master->mode_bits = SPI_MODE_3; |
| 841 | master->num_chipselect = num_cs; |
| 842 | master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(32); |
| 843 | master->prepare_message = a3700_spi_prepare_message; |
| 844 | master->transfer_one = a3700_spi_transfer_one; |
| 845 | master->unprepare_message = a3700_spi_unprepare_message; |
| 846 | master->set_cs = a3700_spi_set_cs; |
Dan Carpenter | 42cd4ed | 2016-12-16 12:33:25 +0300 | [diff] [blame] | 847 | master->mode_bits |= (SPI_RX_DUAL | SPI_TX_DUAL | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 848 | SPI_RX_QUAD | SPI_TX_QUAD); |
| 849 | |
| 850 | platform_set_drvdata(pdev, master); |
| 851 | |
| 852 | spi = spi_master_get_devdata(master); |
| 853 | memset(spi, 0, sizeof(struct a3700_spi)); |
| 854 | |
| 855 | spi->master = master; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 856 | |
YueHaibing | 084fae2 | 2019-09-04 21:58:44 +0800 | [diff] [blame] | 857 | spi->base = devm_platform_ioremap_resource(pdev, 0); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 858 | if (IS_ERR(spi->base)) { |
| 859 | ret = PTR_ERR(spi->base); |
| 860 | goto error; |
| 861 | } |
| 862 | |
Colin Ian King | f6f0083 | 2016-12-13 10:28:12 +0000 | [diff] [blame] | 863 | irq = platform_get_irq(pdev, 0); |
| 864 | if (irq < 0) { |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 865 | ret = -ENXIO; |
| 866 | goto error; |
| 867 | } |
Colin Ian King | f6f0083 | 2016-12-13 10:28:12 +0000 | [diff] [blame] | 868 | spi->irq = irq; |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 869 | |
| 870 | init_completion(&spi->done); |
| 871 | |
| 872 | spi->clk = devm_clk_get(dev, NULL); |
| 873 | if (IS_ERR(spi->clk)) { |
| 874 | dev_err(dev, "could not find clk: %ld\n", PTR_ERR(spi->clk)); |
| 875 | goto error; |
| 876 | } |
| 877 | |
| 878 | ret = clk_prepare(spi->clk); |
| 879 | if (ret) { |
| 880 | dev_err(dev, "could not prepare clk: %d\n", ret); |
| 881 | goto error; |
| 882 | } |
| 883 | |
Maxime Chevallier | abf3a49 | 2018-01-17 17:15:26 +0100 | [diff] [blame] | 884 | master->max_speed_hz = min_t(unsigned long, A3700_SPI_MAX_SPEED_HZ, |
| 885 | clk_get_rate(spi->clk)); |
| 886 | master->min_speed_hz = DIV_ROUND_UP(clk_get_rate(spi->clk), |
| 887 | A3700_SPI_MAX_PRESCALE); |
| 888 | |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 889 | ret = a3700_spi_init(spi); |
| 890 | if (ret) |
| 891 | goto error_clk; |
| 892 | |
| 893 | ret = devm_request_irq(dev, spi->irq, a3700_spi_interrupt, 0, |
| 894 | dev_name(dev), master); |
| 895 | if (ret) { |
| 896 | dev_err(dev, "could not request IRQ: %d\n", ret); |
| 897 | goto error_clk; |
| 898 | } |
| 899 | |
| 900 | ret = devm_spi_register_master(dev, master); |
| 901 | if (ret) { |
| 902 | dev_err(dev, "Failed to register master\n"); |
| 903 | goto error_clk; |
| 904 | } |
| 905 | |
| 906 | return 0; |
| 907 | |
| 908 | error_clk: |
| 909 | clk_disable_unprepare(spi->clk); |
| 910 | error: |
| 911 | spi_master_put(master); |
| 912 | out: |
| 913 | return ret; |
| 914 | } |
| 915 | |
| 916 | static int a3700_spi_remove(struct platform_device *pdev) |
| 917 | { |
| 918 | struct spi_master *master = platform_get_drvdata(pdev); |
| 919 | struct a3700_spi *spi = spi_master_get_devdata(master); |
| 920 | |
| 921 | clk_unprepare(spi->clk); |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 922 | |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | static struct platform_driver a3700_spi_driver = { |
| 927 | .driver = { |
| 928 | .name = DRIVER_NAME, |
Romain Perier | 5762ab7 | 2016-12-08 15:58:44 +0100 | [diff] [blame] | 929 | .of_match_table = of_match_ptr(a3700_spi_dt_ids), |
| 930 | }, |
| 931 | .probe = a3700_spi_probe, |
| 932 | .remove = a3700_spi_remove, |
| 933 | }; |
| 934 | |
| 935 | module_platform_driver(a3700_spi_driver); |
| 936 | |
| 937 | MODULE_DESCRIPTION("Armada-3700 SPI driver"); |
| 938 | MODULE_AUTHOR("Wilson Ding <dingwei@marvell.com>"); |
| 939 | MODULE_LICENSE("GPL"); |
| 940 | MODULE_ALIAS("platform:" DRIVER_NAME); |