Thomas Gleixner | f3949fd | 2019-05-29 16:57:25 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2008-2014 STMicroelectronics Limited |
| 4 | * |
| 5 | * Author: Angus Clark <Angus.Clark@st.com> |
| 6 | * Patrice Chotard <patrice.chotard@st.com> |
| 7 | * Lee Jones <lee.jones@linaro.org> |
| 8 | * |
| 9 | * SPI master mode controller driver, used in STMicroelectronics devices. |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/clk.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/pinctrl/consumer.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/of.h> |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 20 | #include <linux/of_irq.h> |
| 21 | #include <linux/pm_runtime.h> |
| 22 | #include <linux/spi/spi.h> |
| 23 | #include <linux/spi/spi_bitbang.h> |
| 24 | |
| 25 | /* SSC registers */ |
| 26 | #define SSC_BRG 0x000 |
| 27 | #define SSC_TBUF 0x004 |
| 28 | #define SSC_RBUF 0x008 |
| 29 | #define SSC_CTL 0x00C |
| 30 | #define SSC_IEN 0x010 |
| 31 | #define SSC_I2C 0x018 |
| 32 | |
| 33 | /* SSC Control */ |
| 34 | #define SSC_CTL_DATA_WIDTH_9 0x8 |
| 35 | #define SSC_CTL_DATA_WIDTH_MSK 0xf |
| 36 | #define SSC_CTL_BM 0xf |
| 37 | #define SSC_CTL_HB BIT(4) |
| 38 | #define SSC_CTL_PH BIT(5) |
| 39 | #define SSC_CTL_PO BIT(6) |
| 40 | #define SSC_CTL_SR BIT(7) |
| 41 | #define SSC_CTL_MS BIT(8) |
| 42 | #define SSC_CTL_EN BIT(9) |
| 43 | #define SSC_CTL_LPB BIT(10) |
| 44 | #define SSC_CTL_EN_TX_FIFO BIT(11) |
| 45 | #define SSC_CTL_EN_RX_FIFO BIT(12) |
| 46 | #define SSC_CTL_EN_CLST_RX BIT(13) |
| 47 | |
| 48 | /* SSC Interrupt Enable */ |
| 49 | #define SSC_IEN_TEEN BIT(2) |
| 50 | |
| 51 | #define FIFO_SIZE 8 |
| 52 | |
| 53 | struct spi_st { |
| 54 | /* SSC SPI Controller */ |
| 55 | void __iomem *base; |
| 56 | struct clk *clk; |
| 57 | struct device *dev; |
| 58 | |
| 59 | /* SSC SPI current transaction */ |
| 60 | const u8 *tx_ptr; |
| 61 | u8 *rx_ptr; |
| 62 | u16 bytes_per_word; |
| 63 | unsigned int words_remaining; |
| 64 | unsigned int baud; |
| 65 | struct completion done; |
| 66 | }; |
| 67 | |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 68 | /* Load the TX FIFO */ |
| 69 | static void ssc_write_tx_fifo(struct spi_st *spi_st) |
| 70 | { |
| 71 | unsigned int count, i; |
| 72 | uint32_t word = 0; |
| 73 | |
| 74 | if (spi_st->words_remaining > FIFO_SIZE) |
| 75 | count = FIFO_SIZE; |
| 76 | else |
| 77 | count = spi_st->words_remaining; |
| 78 | |
| 79 | for (i = 0; i < count; i++) { |
| 80 | if (spi_st->tx_ptr) { |
| 81 | if (spi_st->bytes_per_word == 1) { |
| 82 | word = *spi_st->tx_ptr++; |
| 83 | } else { |
| 84 | word = *spi_st->tx_ptr++; |
| 85 | word = *spi_st->tx_ptr++ | (word << 8); |
| 86 | } |
| 87 | } |
| 88 | writel_relaxed(word, spi_st->base + SSC_TBUF); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /* Read the RX FIFO */ |
| 93 | static void ssc_read_rx_fifo(struct spi_st *spi_st) |
| 94 | { |
| 95 | unsigned int count, i; |
| 96 | uint32_t word = 0; |
| 97 | |
| 98 | if (spi_st->words_remaining > FIFO_SIZE) |
| 99 | count = FIFO_SIZE; |
| 100 | else |
| 101 | count = spi_st->words_remaining; |
| 102 | |
| 103 | for (i = 0; i < count; i++) { |
| 104 | word = readl_relaxed(spi_st->base + SSC_RBUF); |
| 105 | |
| 106 | if (spi_st->rx_ptr) { |
| 107 | if (spi_st->bytes_per_word == 1) { |
| 108 | *spi_st->rx_ptr++ = (uint8_t)word; |
| 109 | } else { |
| 110 | *spi_st->rx_ptr++ = (word >> 8); |
| 111 | *spi_st->rx_ptr++ = word & 0xff; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | spi_st->words_remaining -= count; |
| 116 | } |
| 117 | |
| 118 | static int spi_st_transfer_one(struct spi_master *master, |
| 119 | struct spi_device *spi, struct spi_transfer *t) |
| 120 | { |
| 121 | struct spi_st *spi_st = spi_master_get_devdata(master); |
| 122 | uint32_t ctl = 0; |
| 123 | |
| 124 | /* Setup transfer */ |
| 125 | spi_st->tx_ptr = t->tx_buf; |
| 126 | spi_st->rx_ptr = t->rx_buf; |
| 127 | |
| 128 | if (spi->bits_per_word > 8) { |
| 129 | /* |
| 130 | * Anything greater than 8 bits-per-word requires 2 |
| 131 | * bytes-per-word in the RX/TX buffers |
| 132 | */ |
| 133 | spi_st->bytes_per_word = 2; |
| 134 | spi_st->words_remaining = t->len / 2; |
| 135 | |
| 136 | } else if (spi->bits_per_word == 8 && !(t->len & 0x1)) { |
| 137 | /* |
| 138 | * If transfer is even-length, and 8 bits-per-word, then |
| 139 | * implement as half-length 16 bits-per-word transfer |
| 140 | */ |
| 141 | spi_st->bytes_per_word = 2; |
| 142 | spi_st->words_remaining = t->len / 2; |
| 143 | |
| 144 | /* Set SSC_CTL to 16 bits-per-word */ |
| 145 | ctl = readl_relaxed(spi_st->base + SSC_CTL); |
| 146 | writel_relaxed((ctl | 0xf), spi_st->base + SSC_CTL); |
| 147 | |
| 148 | readl_relaxed(spi_st->base + SSC_RBUF); |
| 149 | |
| 150 | } else { |
| 151 | spi_st->bytes_per_word = 1; |
| 152 | spi_st->words_remaining = t->len; |
| 153 | } |
| 154 | |
| 155 | reinit_completion(&spi_st->done); |
| 156 | |
| 157 | /* Start transfer by writing to the TX FIFO */ |
| 158 | ssc_write_tx_fifo(spi_st); |
| 159 | writel_relaxed(SSC_IEN_TEEN, spi_st->base + SSC_IEN); |
| 160 | |
| 161 | /* Wait for transfer to complete */ |
| 162 | wait_for_completion(&spi_st->done); |
| 163 | |
| 164 | /* Restore SSC_CTL if necessary */ |
| 165 | if (ctl) |
| 166 | writel_relaxed(ctl, spi_st->base + SSC_CTL); |
| 167 | |
| 168 | spi_finalize_current_transfer(spi->master); |
| 169 | |
| 170 | return t->len; |
| 171 | } |
| 172 | |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 173 | /* the spi->mode bits understood by this driver: */ |
| 174 | #define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_LOOP | SPI_CS_HIGH) |
| 175 | static int spi_st_setup(struct spi_device *spi) |
| 176 | { |
| 177 | struct spi_st *spi_st = spi_master_get_devdata(spi->master); |
| 178 | u32 spi_st_clk, sscbrg, var; |
| 179 | u32 hz = spi->max_speed_hz; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 180 | |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 181 | if (!hz) { |
| 182 | dev_err(&spi->dev, "max_speed_hz unspecified\n"); |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | |
Amit Kumar Mahapatra via Alsa-devel | 9e264f3f | 2023-03-10 23:02:03 +0530 | [diff] [blame] | 186 | if (!spi_get_csgpiod(spi, 0)) { |
Linus Walleij | 3215996 | 2022-02-01 02:26:54 +0100 | [diff] [blame] | 187 | dev_err(&spi->dev, "no valid gpio assigned\n"); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 188 | return -EINVAL; |
| 189 | } |
| 190 | |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 191 | spi_st_clk = clk_get_rate(spi_st->clk); |
| 192 | |
| 193 | /* Set SSC_BRF */ |
| 194 | sscbrg = spi_st_clk / (2 * hz); |
| 195 | if (sscbrg < 0x07 || sscbrg > BIT(16)) { |
| 196 | dev_err(&spi->dev, |
| 197 | "baudrate %d outside valid range %d\n", sscbrg, hz); |
Linus Walleij | 3215996 | 2022-02-01 02:26:54 +0100 | [diff] [blame] | 198 | return -EINVAL; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | spi_st->baud = spi_st_clk / (2 * sscbrg); |
| 202 | if (sscbrg == BIT(16)) /* 16-bit counter wraps */ |
| 203 | sscbrg = 0x0; |
| 204 | |
| 205 | writel_relaxed(sscbrg, spi_st->base + SSC_BRG); |
| 206 | |
| 207 | dev_dbg(&spi->dev, |
| 208 | "setting baudrate:target= %u hz, actual= %u hz, sscbrg= %u\n", |
| 209 | hz, spi_st->baud, sscbrg); |
| 210 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 211 | /* Set SSC_CTL and enable SSC */ |
| 212 | var = readl_relaxed(spi_st->base + SSC_CTL); |
| 213 | var |= SSC_CTL_MS; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 214 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 215 | if (spi->mode & SPI_CPOL) |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 216 | var |= SSC_CTL_PO; |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 217 | else |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 218 | var &= ~SSC_CTL_PO; |
| 219 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 220 | if (spi->mode & SPI_CPHA) |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 221 | var |= SSC_CTL_PH; |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 222 | else |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 223 | var &= ~SSC_CTL_PH; |
| 224 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 225 | if ((spi->mode & SPI_LSB_FIRST) == 0) |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 226 | var |= SSC_CTL_HB; |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 227 | else |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 228 | var &= ~SSC_CTL_HB; |
| 229 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 230 | if (spi->mode & SPI_LOOP) |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 231 | var |= SSC_CTL_LPB; |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 232 | else |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 233 | var &= ~SSC_CTL_LPB; |
| 234 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 235 | var &= ~SSC_CTL_DATA_WIDTH_MSK; |
| 236 | var |= (spi->bits_per_word - 1); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 237 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 238 | var |= SSC_CTL_EN_TX_FIFO | SSC_CTL_EN_RX_FIFO; |
| 239 | var |= SSC_CTL_EN; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 240 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 241 | writel_relaxed(var, spi_st->base + SSC_CTL); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 242 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 243 | /* Clear the status register */ |
| 244 | readl_relaxed(spi_st->base + SSC_RBUF); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 245 | |
Chris Packham | 0b0cda4 | 2017-05-25 16:05:05 +1200 | [diff] [blame] | 246 | return 0; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | /* Interrupt fired when TX shift register becomes empty */ |
| 250 | static irqreturn_t spi_st_irq(int irq, void *dev_id) |
| 251 | { |
| 252 | struct spi_st *spi_st = (struct spi_st *)dev_id; |
| 253 | |
| 254 | /* Read RX FIFO */ |
| 255 | ssc_read_rx_fifo(spi_st); |
| 256 | |
| 257 | /* Fill TX FIFO */ |
| 258 | if (spi_st->words_remaining) { |
| 259 | ssc_write_tx_fifo(spi_st); |
| 260 | } else { |
| 261 | /* TX/RX complete */ |
| 262 | writel_relaxed(0x0, spi_st->base + SSC_IEN); |
| 263 | /* |
| 264 | * read SSC_IEN to ensure that this bit is set |
| 265 | * before re-enabling interrupt |
| 266 | */ |
| 267 | readl(spi_st->base + SSC_IEN); |
| 268 | complete(&spi_st->done); |
| 269 | } |
| 270 | |
| 271 | return IRQ_HANDLED; |
| 272 | } |
| 273 | |
| 274 | static int spi_st_probe(struct platform_device *pdev) |
| 275 | { |
| 276 | struct device_node *np = pdev->dev.of_node; |
| 277 | struct spi_master *master; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 278 | struct spi_st *spi_st; |
| 279 | int irq, ret = 0; |
| 280 | u32 var; |
| 281 | |
| 282 | master = spi_alloc_master(&pdev->dev, sizeof(*spi_st)); |
| 283 | if (!master) |
| 284 | return -ENOMEM; |
| 285 | |
| 286 | master->dev.of_node = np; |
| 287 | master->mode_bits = MODEBITS; |
| 288 | master->setup = spi_st_setup; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 289 | master->transfer_one = spi_st_transfer_one; |
| 290 | master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); |
| 291 | master->auto_runtime_pm = true; |
| 292 | master->bus_num = pdev->id; |
Linus Walleij | 3215996 | 2022-02-01 02:26:54 +0100 | [diff] [blame] | 293 | master->use_gpio_descriptors = true; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 294 | spi_st = spi_master_get_devdata(master); |
| 295 | |
| 296 | spi_st->clk = devm_clk_get(&pdev->dev, "ssc"); |
| 297 | if (IS_ERR(spi_st->clk)) { |
| 298 | dev_err(&pdev->dev, "Unable to request clock\n"); |
Axel Lin | 1051550 | 2016-04-29 13:39:38 +0800 | [diff] [blame] | 299 | ret = PTR_ERR(spi_st->clk); |
| 300 | goto put_master; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 301 | } |
| 302 | |
Lee Jones | cf4b5ce | 2016-06-07 13:19:00 +0200 | [diff] [blame] | 303 | ret = clk_prepare_enable(spi_st->clk); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 304 | if (ret) |
Axel Lin | 1051550 | 2016-04-29 13:39:38 +0800 | [diff] [blame] | 305 | goto put_master; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 306 | |
| 307 | init_completion(&spi_st->done); |
| 308 | |
| 309 | /* Get resources */ |
YueHaibing | 338dd35 | 2019-09-04 21:59:10 +0800 | [diff] [blame] | 310 | spi_st->base = devm_platform_ioremap_resource(pdev, 0); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 311 | if (IS_ERR(spi_st->base)) { |
| 312 | ret = PTR_ERR(spi_st->base); |
| 313 | goto clk_disable; |
| 314 | } |
| 315 | |
| 316 | /* Disable I2C and Reset SSC */ |
| 317 | writel_relaxed(0x0, spi_st->base + SSC_I2C); |
| 318 | var = readw_relaxed(spi_st->base + SSC_CTL); |
| 319 | var |= SSC_CTL_SR; |
| 320 | writel_relaxed(var, spi_st->base + SSC_CTL); |
| 321 | |
| 322 | udelay(1); |
| 323 | var = readl_relaxed(spi_st->base + SSC_CTL); |
| 324 | var &= ~SSC_CTL_SR; |
| 325 | writel_relaxed(var, spi_st->base + SSC_CTL); |
| 326 | |
| 327 | /* Set SSC into slave mode before reconfiguring PIO pins */ |
| 328 | var = readl_relaxed(spi_st->base + SSC_CTL); |
| 329 | var &= ~SSC_CTL_MS; |
| 330 | writel_relaxed(var, spi_st->base + SSC_CTL); |
| 331 | |
| 332 | irq = irq_of_parse_and_map(np, 0); |
| 333 | if (!irq) { |
| 334 | dev_err(&pdev->dev, "IRQ missing or invalid\n"); |
| 335 | ret = -EINVAL; |
| 336 | goto clk_disable; |
| 337 | } |
| 338 | |
| 339 | ret = devm_request_irq(&pdev->dev, irq, spi_st_irq, 0, |
| 340 | pdev->name, spi_st); |
| 341 | if (ret) { |
| 342 | dev_err(&pdev->dev, "Failed to request irq %d\n", irq); |
| 343 | goto clk_disable; |
| 344 | } |
| 345 | |
| 346 | /* by default the device is on */ |
| 347 | pm_runtime_set_active(&pdev->dev); |
| 348 | pm_runtime_enable(&pdev->dev); |
| 349 | |
| 350 | platform_set_drvdata(pdev, master); |
| 351 | |
| 352 | ret = devm_spi_register_master(&pdev->dev, master); |
| 353 | if (ret) { |
| 354 | dev_err(&pdev->dev, "Failed to register master\n"); |
Lukas Wunner | 5ef76dac | 2020-11-08 23:41:00 +0100 | [diff] [blame] | 355 | goto rpm_disable; |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | return 0; |
| 359 | |
Lukas Wunner | 5ef76dac | 2020-11-08 23:41:00 +0100 | [diff] [blame] | 360 | rpm_disable: |
Chuhong Yuan | cd050ab | 2019-11-18 10:48:48 +0800 | [diff] [blame] | 361 | pm_runtime_disable(&pdev->dev); |
Lukas Wunner | 5ef76dac | 2020-11-08 23:41:00 +0100 | [diff] [blame] | 362 | clk_disable: |
Lee Jones | cf4b5ce | 2016-06-07 13:19:00 +0200 | [diff] [blame] | 363 | clk_disable_unprepare(spi_st->clk); |
Axel Lin | 1051550 | 2016-04-29 13:39:38 +0800 | [diff] [blame] | 364 | put_master: |
| 365 | spi_master_put(master); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 366 | return ret; |
| 367 | } |
| 368 | |
Uwe Kleine-König | 2dd42da | 2023-03-03 18:20:25 +0100 | [diff] [blame] | 369 | static void spi_st_remove(struct platform_device *pdev) |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 370 | { |
| 371 | struct spi_master *master = platform_get_drvdata(pdev); |
| 372 | struct spi_st *spi_st = spi_master_get_devdata(master); |
| 373 | |
Chuhong Yuan | cd050ab | 2019-11-18 10:48:48 +0800 | [diff] [blame] | 374 | pm_runtime_disable(&pdev->dev); |
| 375 | |
Lee Jones | cf4b5ce | 2016-06-07 13:19:00 +0200 | [diff] [blame] | 376 | clk_disable_unprepare(spi_st->clk); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 377 | |
| 378 | pinctrl_pm_select_sleep_state(&pdev->dev); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | #ifdef CONFIG_PM |
| 382 | static int spi_st_runtime_suspend(struct device *dev) |
| 383 | { |
| 384 | struct spi_master *master = dev_get_drvdata(dev); |
| 385 | struct spi_st *spi_st = spi_master_get_devdata(master); |
| 386 | |
| 387 | writel_relaxed(0, spi_st->base + SSC_IEN); |
| 388 | pinctrl_pm_select_sleep_state(dev); |
| 389 | |
Lee Jones | cf4b5ce | 2016-06-07 13:19:00 +0200 | [diff] [blame] | 390 | clk_disable_unprepare(spi_st->clk); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | static int spi_st_runtime_resume(struct device *dev) |
| 396 | { |
| 397 | struct spi_master *master = dev_get_drvdata(dev); |
| 398 | struct spi_st *spi_st = spi_master_get_devdata(master); |
| 399 | int ret; |
| 400 | |
Lee Jones | cf4b5ce | 2016-06-07 13:19:00 +0200 | [diff] [blame] | 401 | ret = clk_prepare_enable(spi_st->clk); |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 402 | pinctrl_pm_select_default_state(dev); |
| 403 | |
| 404 | return ret; |
| 405 | } |
| 406 | #endif |
| 407 | |
| 408 | #ifdef CONFIG_PM_SLEEP |
| 409 | static int spi_st_suspend(struct device *dev) |
| 410 | { |
| 411 | struct spi_master *master = dev_get_drvdata(dev); |
| 412 | int ret; |
| 413 | |
| 414 | ret = spi_master_suspend(master); |
| 415 | if (ret) |
| 416 | return ret; |
| 417 | |
| 418 | return pm_runtime_force_suspend(dev); |
| 419 | } |
| 420 | |
| 421 | static int spi_st_resume(struct device *dev) |
| 422 | { |
| 423 | struct spi_master *master = dev_get_drvdata(dev); |
| 424 | int ret; |
| 425 | |
| 426 | ret = spi_master_resume(master); |
| 427 | if (ret) |
| 428 | return ret; |
| 429 | |
| 430 | return pm_runtime_force_resume(dev); |
| 431 | } |
| 432 | #endif |
| 433 | |
| 434 | static const struct dev_pm_ops spi_st_pm = { |
| 435 | SET_SYSTEM_SLEEP_PM_OPS(spi_st_suspend, spi_st_resume) |
| 436 | SET_RUNTIME_PM_OPS(spi_st_runtime_suspend, spi_st_runtime_resume, NULL) |
| 437 | }; |
| 438 | |
Fabian Frederick | 0935540 | 2015-03-16 20:20:31 +0100 | [diff] [blame] | 439 | static const struct of_device_id stm_spi_match[] = { |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 440 | { .compatible = "st,comms-ssc4-spi", }, |
| 441 | {}, |
| 442 | }; |
| 443 | MODULE_DEVICE_TABLE(of, stm_spi_match); |
| 444 | |
| 445 | static struct platform_driver spi_st_driver = { |
| 446 | .driver = { |
| 447 | .name = "spi-st", |
| 448 | .pm = &spi_st_pm, |
| 449 | .of_match_table = of_match_ptr(stm_spi_match), |
| 450 | }, |
| 451 | .probe = spi_st_probe, |
Uwe Kleine-König | 2dd42da | 2023-03-03 18:20:25 +0100 | [diff] [blame] | 452 | .remove_new = spi_st_remove, |
Lee Jones | 9e86237 | 2014-12-09 20:21:30 +0000 | [diff] [blame] | 453 | }; |
| 454 | module_platform_driver(spi_st_driver); |
| 455 | |
| 456 | MODULE_AUTHOR("Patrice Chotard <patrice.chotard@st.com>"); |
| 457 | MODULE_DESCRIPTION("STM SSC SPI driver"); |
| 458 | MODULE_LICENSE("GPL v2"); |