Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Broadcom BCM63xx SPI controller support |
| 3 | * |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 4 | * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org> |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 5 | * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the |
| 19 | * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | */ |
| 21 | |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/clk.h> |
| 25 | #include <linux/io.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/interrupt.h> |
| 30 | #include <linux/spi/spi.h> |
| 31 | #include <linux/completion.h> |
| 32 | #include <linux/err.h> |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 33 | #include <linux/workqueue.h> |
| 34 | #include <linux/pm_runtime.h> |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 35 | |
| 36 | #include <bcm63xx_dev_spi.h> |
| 37 | |
| 38 | #define PFX KBUILD_MODNAME |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 39 | |
| 40 | struct bcm63xx_spi { |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 41 | struct completion done; |
| 42 | |
| 43 | void __iomem *regs; |
| 44 | int irq; |
| 45 | |
| 46 | /* Platform data */ |
| 47 | u32 speed_hz; |
| 48 | unsigned fifo_size; |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 49 | unsigned int msg_type_shift; |
| 50 | unsigned int msg_ctl_width; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 51 | |
| 52 | /* Data buffers */ |
| 53 | const unsigned char *tx_ptr; |
| 54 | unsigned char *rx_ptr; |
| 55 | |
| 56 | /* data iomem */ |
| 57 | u8 __iomem *tx_io; |
| 58 | const u8 __iomem *rx_io; |
| 59 | |
| 60 | int remaining_bytes; |
| 61 | |
| 62 | struct clk *clk; |
| 63 | struct platform_device *pdev; |
| 64 | }; |
| 65 | |
| 66 | static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, |
| 67 | unsigned int offset) |
| 68 | { |
| 69 | return bcm_readb(bs->regs + bcm63xx_spireg(offset)); |
| 70 | } |
| 71 | |
| 72 | static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, |
| 73 | unsigned int offset) |
| 74 | { |
| 75 | return bcm_readw(bs->regs + bcm63xx_spireg(offset)); |
| 76 | } |
| 77 | |
| 78 | static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, |
| 79 | u8 value, unsigned int offset) |
| 80 | { |
| 81 | bcm_writeb(value, bs->regs + bcm63xx_spireg(offset)); |
| 82 | } |
| 83 | |
| 84 | static inline void bcm_spi_writew(struct bcm63xx_spi *bs, |
| 85 | u16 value, unsigned int offset) |
| 86 | { |
| 87 | bcm_writew(value, bs->regs + bcm63xx_spireg(offset)); |
| 88 | } |
| 89 | |
| 90 | static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { |
| 91 | { 20000000, SPI_CLK_20MHZ }, |
| 92 | { 12500000, SPI_CLK_12_50MHZ }, |
| 93 | { 6250000, SPI_CLK_6_250MHZ }, |
| 94 | { 3125000, SPI_CLK_3_125MHZ }, |
| 95 | { 1563000, SPI_CLK_1_563MHZ }, |
| 96 | { 781000, SPI_CLK_0_781MHZ }, |
| 97 | { 391000, SPI_CLK_0_391MHZ } |
| 98 | }; |
| 99 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 100 | static int bcm63xx_spi_check_transfer(struct spi_device *spi, |
| 101 | struct spi_transfer *t) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 102 | { |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 103 | u8 bits_per_word; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 104 | |
| 105 | bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 106 | if (bits_per_word != 8) { |
| 107 | dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", |
| 108 | __func__, bits_per_word); |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | |
| 112 | if (spi->chip_select > spi->master->num_chipselect) { |
| 113 | dev_err(&spi->dev, "%s, unsupported slave %d\n", |
| 114 | __func__, spi->chip_select); |
| 115 | return -EINVAL; |
| 116 | } |
| 117 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static void bcm63xx_spi_setup_transfer(struct spi_device *spi, |
| 122 | struct spi_transfer *t) |
| 123 | { |
| 124 | struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); |
| 125 | u32 hz; |
| 126 | u8 clk_cfg, reg; |
| 127 | int i; |
| 128 | |
| 129 | hz = (t) ? t->speed_hz : spi->max_speed_hz; |
| 130 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 131 | /* Find the closest clock configuration */ |
| 132 | for (i = 0; i < SPI_CLK_MASK; i++) { |
Florian Fainelli | d76ea24 | 2012-07-23 14:44:36 +0200 | [diff] [blame] | 133 | if (hz >= bcm63xx_spi_freq_table[i][0]) { |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 134 | clk_cfg = bcm63xx_spi_freq_table[i][1]; |
| 135 | break; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /* No matching configuration found, default to lowest */ |
| 140 | if (i == SPI_CLK_MASK) |
| 141 | clk_cfg = SPI_CLK_0_391MHZ; |
| 142 | |
| 143 | /* clear existing clock configuration bits of the register */ |
| 144 | reg = bcm_spi_readb(bs, SPI_CLK_CFG); |
| 145 | reg &= ~SPI_CLK_MASK; |
| 146 | reg |= clk_cfg; |
| 147 | |
| 148 | bcm_spi_writeb(bs, reg, SPI_CLK_CFG); |
| 149 | dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", |
| 150 | clk_cfg, hz); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | /* the spi->mode bits understood by this driver: */ |
| 154 | #define MODEBITS (SPI_CPOL | SPI_CPHA) |
| 155 | |
| 156 | static int bcm63xx_spi_setup(struct spi_device *spi) |
| 157 | { |
| 158 | struct bcm63xx_spi *bs; |
| 159 | int ret; |
| 160 | |
| 161 | bs = spi_master_get_devdata(spi->master); |
| 162 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 163 | if (!spi->bits_per_word) |
| 164 | spi->bits_per_word = 8; |
| 165 | |
| 166 | if (spi->mode & ~MODEBITS) { |
| 167 | dev_err(&spi->dev, "%s, unsupported mode bits %x\n", |
| 168 | __func__, spi->mode & ~MODEBITS); |
| 169 | return -EINVAL; |
| 170 | } |
| 171 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 172 | dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n", |
| 173 | __func__, spi->mode & MODEBITS, spi->bits_per_word, 0); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | /* Fill the TX FIFO with as many bytes as possible */ |
| 179 | static void bcm63xx_spi_fill_tx_fifo(struct bcm63xx_spi *bs) |
| 180 | { |
| 181 | u8 size; |
| 182 | |
| 183 | /* Fill the Tx FIFO with as many bytes as possible */ |
| 184 | size = bs->remaining_bytes < bs->fifo_size ? bs->remaining_bytes : |
| 185 | bs->fifo_size; |
| 186 | memcpy_toio(bs->tx_io, bs->tx_ptr, size); |
| 187 | bs->remaining_bytes -= size; |
| 188 | } |
| 189 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 190 | static unsigned int bcm63xx_txrx_bufs(struct spi_device *spi, |
| 191 | struct spi_transfer *t) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 192 | { |
| 193 | struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); |
| 194 | u16 msg_ctl; |
| 195 | u16 cmd; |
| 196 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 197 | /* Disable the CMD_DONE interrupt */ |
| 198 | bcm_spi_writeb(bs, 0, SPI_INT_MASK); |
| 199 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 200 | dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", |
| 201 | t->tx_buf, t->rx_buf, t->len); |
| 202 | |
| 203 | /* Transmitter is inhibited */ |
| 204 | bs->tx_ptr = t->tx_buf; |
| 205 | bs->rx_ptr = t->rx_buf; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 206 | |
| 207 | if (t->tx_buf) { |
| 208 | bs->remaining_bytes = t->len; |
| 209 | bcm63xx_spi_fill_tx_fifo(bs); |
| 210 | } |
| 211 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 212 | init_completion(&bs->done); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 213 | |
| 214 | /* Fill in the Message control register */ |
| 215 | msg_ctl = (t->len << SPI_BYTE_CNT_SHIFT); |
| 216 | |
| 217 | if (t->rx_buf && t->tx_buf) |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 218 | msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 219 | else if (t->rx_buf) |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 220 | msg_ctl |= (SPI_HD_R << bs->msg_type_shift); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 221 | else if (t->tx_buf) |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 222 | msg_ctl |= (SPI_HD_W << bs->msg_type_shift); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 223 | |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 224 | switch (bs->msg_ctl_width) { |
| 225 | case 8: |
| 226 | bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); |
| 227 | break; |
| 228 | case 16: |
| 229 | bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); |
| 230 | break; |
| 231 | } |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 232 | |
| 233 | /* Issue the transfer */ |
| 234 | cmd = SPI_CMD_START_IMMEDIATE; |
| 235 | cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); |
| 236 | cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); |
| 237 | bcm_spi_writew(bs, cmd, SPI_CMD); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 238 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 239 | /* Enable the CMD_DONE interrupt */ |
| 240 | bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 241 | |
| 242 | return t->len - bs->remaining_bytes; |
| 243 | } |
| 244 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 245 | static int bcm63xx_spi_prepare_transfer(struct spi_master *master) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 246 | { |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 247 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 248 | |
| 249 | pm_runtime_get_sync(&bs->pdev->dev); |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static int bcm63xx_spi_unprepare_transfer(struct spi_master *master) |
| 255 | { |
| 256 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 257 | |
| 258 | pm_runtime_put(&bs->pdev->dev); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static int bcm63xx_spi_transfer_one(struct spi_master *master, |
| 264 | struct spi_message *m) |
| 265 | { |
| 266 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 267 | struct spi_transfer *t; |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 268 | struct spi_device *spi = m->spi; |
| 269 | int status = 0; |
| 270 | unsigned int timeout = 0; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 271 | |
| 272 | list_for_each_entry(t, &m->transfers, transfer_list) { |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 273 | unsigned int len = t->len; |
| 274 | u8 rx_tail; |
| 275 | |
| 276 | status = bcm63xx_spi_check_transfer(spi, t); |
| 277 | if (status < 0) |
| 278 | goto exit; |
| 279 | |
| 280 | /* configure adapter for a new transfer */ |
| 281 | bcm63xx_spi_setup_transfer(spi, t); |
| 282 | |
| 283 | while (len) { |
| 284 | /* send the data */ |
| 285 | len -= bcm63xx_txrx_bufs(spi, t); |
| 286 | |
| 287 | timeout = wait_for_completion_timeout(&bs->done, HZ); |
| 288 | if (!timeout) { |
| 289 | status = -ETIMEDOUT; |
| 290 | goto exit; |
| 291 | } |
| 292 | |
| 293 | /* read out all data */ |
| 294 | rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL); |
| 295 | |
| 296 | /* Read out all the data */ |
| 297 | if (rx_tail) |
| 298 | memcpy_fromio(bs->rx_ptr, bs->rx_io, rx_tail); |
| 299 | } |
| 300 | |
| 301 | m->actual_length += t->len; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 302 | } |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 303 | exit: |
| 304 | m->status = status; |
| 305 | spi_finalize_current_message(master); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 306 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 307 | return 0; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | /* This driver supports single master mode only. Hence |
| 311 | * CMD_DONE is the only interrupt we care about |
| 312 | */ |
| 313 | static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) |
| 314 | { |
| 315 | struct spi_master *master = (struct spi_master *)dev_id; |
| 316 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 317 | u8 intr; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 318 | |
| 319 | /* Read interupts and clear them immediately */ |
| 320 | intr = bcm_spi_readb(bs, SPI_INT_STATUS); |
| 321 | bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); |
| 322 | bcm_spi_writeb(bs, 0, SPI_INT_MASK); |
| 323 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 324 | /* A transfer completed */ |
| 325 | if (intr & SPI_INTR_CMD_DONE) |
| 326 | complete(&bs->done); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 327 | |
| 328 | return IRQ_HANDLED; |
| 329 | } |
| 330 | |
| 331 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame^] | 332 | static int bcm63xx_spi_probe(struct platform_device *pdev) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 333 | { |
| 334 | struct resource *r; |
| 335 | struct device *dev = &pdev->dev; |
| 336 | struct bcm63xx_spi_pdata *pdata = pdev->dev.platform_data; |
| 337 | int irq; |
| 338 | struct spi_master *master; |
| 339 | struct clk *clk; |
| 340 | struct bcm63xx_spi *bs; |
| 341 | int ret; |
| 342 | |
| 343 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 344 | if (!r) { |
| 345 | dev_err(dev, "no iomem\n"); |
| 346 | ret = -ENXIO; |
| 347 | goto out; |
| 348 | } |
| 349 | |
| 350 | irq = platform_get_irq(pdev, 0); |
| 351 | if (irq < 0) { |
| 352 | dev_err(dev, "no irq\n"); |
| 353 | ret = -ENXIO; |
| 354 | goto out; |
| 355 | } |
| 356 | |
| 357 | clk = clk_get(dev, "spi"); |
| 358 | if (IS_ERR(clk)) { |
| 359 | dev_err(dev, "no clock for device\n"); |
| 360 | ret = PTR_ERR(clk); |
| 361 | goto out; |
| 362 | } |
| 363 | |
| 364 | master = spi_alloc_master(dev, sizeof(*bs)); |
| 365 | if (!master) { |
| 366 | dev_err(dev, "out of memory\n"); |
| 367 | ret = -ENOMEM; |
| 368 | goto out_clk; |
| 369 | } |
| 370 | |
| 371 | bs = spi_master_get_devdata(master); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 372 | |
| 373 | platform_set_drvdata(pdev, master); |
| 374 | bs->pdev = pdev; |
| 375 | |
| 376 | if (!devm_request_mem_region(&pdev->dev, r->start, |
| 377 | resource_size(r), PFX)) { |
| 378 | dev_err(dev, "iomem request failed\n"); |
| 379 | ret = -ENXIO; |
| 380 | goto out_err; |
| 381 | } |
| 382 | |
| 383 | bs->regs = devm_ioremap_nocache(&pdev->dev, r->start, |
| 384 | resource_size(r)); |
| 385 | if (!bs->regs) { |
| 386 | dev_err(dev, "unable to ioremap regs\n"); |
| 387 | ret = -ENOMEM; |
| 388 | goto out_err; |
| 389 | } |
| 390 | |
| 391 | bs->irq = irq; |
| 392 | bs->clk = clk; |
| 393 | bs->fifo_size = pdata->fifo_size; |
| 394 | |
| 395 | ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, |
| 396 | pdev->name, master); |
| 397 | if (ret) { |
| 398 | dev_err(dev, "unable to request irq\n"); |
| 399 | goto out_err; |
| 400 | } |
| 401 | |
| 402 | master->bus_num = pdata->bus_num; |
| 403 | master->num_chipselect = pdata->num_chipselect; |
| 404 | master->setup = bcm63xx_spi_setup; |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 405 | master->prepare_transfer_hardware = bcm63xx_spi_prepare_transfer; |
| 406 | master->unprepare_transfer_hardware = bcm63xx_spi_unprepare_transfer; |
| 407 | master->transfer_one_message = bcm63xx_spi_transfer_one; |
Florian Fainelli | 88a3a25 | 2012-04-20 15:37:35 +0200 | [diff] [blame] | 408 | master->mode_bits = MODEBITS; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 409 | bs->speed_hz = pdata->speed_hz; |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 410 | bs->msg_type_shift = pdata->msg_type_shift; |
| 411 | bs->msg_ctl_width = pdata->msg_ctl_width; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 412 | bs->tx_io = (u8 *)(bs->regs + bcm63xx_spireg(SPI_MSG_DATA)); |
| 413 | bs->rx_io = (const u8 *)(bs->regs + bcm63xx_spireg(SPI_RX_DATA)); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 414 | |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 415 | switch (bs->msg_ctl_width) { |
| 416 | case 8: |
| 417 | case 16: |
| 418 | break; |
| 419 | default: |
| 420 | dev_err(dev, "unsupported MSG_CTL width: %d\n", |
| 421 | bs->msg_ctl_width); |
| 422 | goto out_clk_disable; |
| 423 | } |
| 424 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 425 | /* Initialize hardware */ |
| 426 | clk_enable(bs->clk); |
| 427 | bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); |
| 428 | |
| 429 | /* register and we are done */ |
| 430 | ret = spi_register_master(master); |
| 431 | if (ret) { |
| 432 | dev_err(dev, "spi register failed\n"); |
| 433 | goto out_clk_disable; |
| 434 | } |
| 435 | |
Florian Fainelli | 61d1596 | 2012-10-03 11:56:53 +0200 | [diff] [blame] | 436 | dev_info(dev, "at 0x%08x (irq %d, FIFOs size %d)\n", |
| 437 | r->start, irq, bs->fifo_size); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 438 | |
| 439 | return 0; |
| 440 | |
| 441 | out_clk_disable: |
| 442 | clk_disable(clk); |
| 443 | out_err: |
| 444 | platform_set_drvdata(pdev, NULL); |
| 445 | spi_master_put(master); |
| 446 | out_clk: |
| 447 | clk_put(clk); |
| 448 | out: |
| 449 | return ret; |
| 450 | } |
| 451 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame^] | 452 | static int bcm63xx_spi_remove(struct platform_device *pdev) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 453 | { |
Guenter Roeck | 1f68237 | 2012-08-10 13:56:27 -0700 | [diff] [blame] | 454 | struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 455 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 456 | |
Florian Fainelli | 1e41dc0 | 2012-04-20 15:37:34 +0200 | [diff] [blame] | 457 | spi_unregister_master(master); |
| 458 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 459 | /* reset spi block */ |
| 460 | bcm_spi_writeb(bs, 0, SPI_INT_MASK); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 461 | |
| 462 | /* HW shutdown */ |
| 463 | clk_disable(bs->clk); |
| 464 | clk_put(bs->clk); |
| 465 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 466 | platform_set_drvdata(pdev, 0); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 467 | |
Guenter Roeck | 1f68237 | 2012-08-10 13:56:27 -0700 | [diff] [blame] | 468 | spi_master_put(master); |
| 469 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | #ifdef CONFIG_PM |
| 474 | static int bcm63xx_spi_suspend(struct device *dev) |
| 475 | { |
| 476 | struct spi_master *master = |
| 477 | platform_get_drvdata(to_platform_device(dev)); |
| 478 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 479 | |
Florian Fainelli | 9651995 | 2012-10-03 11:56:54 +0200 | [diff] [blame] | 480 | spi_master_suspend(master); |
| 481 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 482 | clk_disable(bs->clk); |
| 483 | |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | static int bcm63xx_spi_resume(struct device *dev) |
| 488 | { |
| 489 | struct spi_master *master = |
| 490 | platform_get_drvdata(to_platform_device(dev)); |
| 491 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 492 | |
| 493 | clk_enable(bs->clk); |
| 494 | |
Florian Fainelli | 9651995 | 2012-10-03 11:56:54 +0200 | [diff] [blame] | 495 | spi_master_resume(master); |
| 496 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | static const struct dev_pm_ops bcm63xx_spi_pm_ops = { |
| 501 | .suspend = bcm63xx_spi_suspend, |
| 502 | .resume = bcm63xx_spi_resume, |
| 503 | }; |
| 504 | |
| 505 | #define BCM63XX_SPI_PM_OPS (&bcm63xx_spi_pm_ops) |
| 506 | #else |
| 507 | #define BCM63XX_SPI_PM_OPS NULL |
| 508 | #endif |
| 509 | |
| 510 | static struct platform_driver bcm63xx_spi_driver = { |
| 511 | .driver = { |
| 512 | .name = "bcm63xx-spi", |
| 513 | .owner = THIS_MODULE, |
| 514 | .pm = BCM63XX_SPI_PM_OPS, |
| 515 | }, |
| 516 | .probe = bcm63xx_spi_probe, |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame^] | 517 | .remove = bcm63xx_spi_remove, |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 518 | }; |
| 519 | |
| 520 | module_platform_driver(bcm63xx_spi_driver); |
| 521 | |
| 522 | MODULE_ALIAS("platform:bcm63xx_spi"); |
| 523 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); |
| 524 | MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); |
| 525 | MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); |
| 526 | MODULE_LICENSE("GPL"); |