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 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 40 | #define BCM63XX_SPI_MAX_PREPEND 15 |
| 41 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 42 | struct bcm63xx_spi { |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 43 | struct completion done; |
| 44 | |
| 45 | void __iomem *regs; |
| 46 | int irq; |
| 47 | |
| 48 | /* Platform data */ |
| 49 | u32 speed_hz; |
| 50 | unsigned fifo_size; |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 51 | unsigned int msg_type_shift; |
| 52 | unsigned int msg_ctl_width; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 53 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 54 | /* data iomem */ |
| 55 | u8 __iomem *tx_io; |
| 56 | const u8 __iomem *rx_io; |
| 57 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 58 | struct clk *clk; |
| 59 | struct platform_device *pdev; |
| 60 | }; |
| 61 | |
| 62 | static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, |
| 63 | unsigned int offset) |
| 64 | { |
| 65 | return bcm_readb(bs->regs + bcm63xx_spireg(offset)); |
| 66 | } |
| 67 | |
| 68 | static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, |
| 69 | unsigned int offset) |
| 70 | { |
| 71 | return bcm_readw(bs->regs + bcm63xx_spireg(offset)); |
| 72 | } |
| 73 | |
| 74 | static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, |
| 75 | u8 value, unsigned int offset) |
| 76 | { |
| 77 | bcm_writeb(value, bs->regs + bcm63xx_spireg(offset)); |
| 78 | } |
| 79 | |
| 80 | static inline void bcm_spi_writew(struct bcm63xx_spi *bs, |
| 81 | u16 value, unsigned int offset) |
| 82 | { |
| 83 | bcm_writew(value, bs->regs + bcm63xx_spireg(offset)); |
| 84 | } |
| 85 | |
| 86 | static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { |
| 87 | { 20000000, SPI_CLK_20MHZ }, |
| 88 | { 12500000, SPI_CLK_12_50MHZ }, |
| 89 | { 6250000, SPI_CLK_6_250MHZ }, |
| 90 | { 3125000, SPI_CLK_3_125MHZ }, |
| 91 | { 1563000, SPI_CLK_1_563MHZ }, |
| 92 | { 781000, SPI_CLK_0_781MHZ }, |
| 93 | { 391000, SPI_CLK_0_391MHZ } |
| 94 | }; |
| 95 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 96 | static void bcm63xx_spi_setup_transfer(struct spi_device *spi, |
| 97 | struct spi_transfer *t) |
| 98 | { |
| 99 | struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 100 | u8 clk_cfg, reg; |
| 101 | int i; |
| 102 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 103 | /* Find the closest clock configuration */ |
| 104 | for (i = 0; i < SPI_CLK_MASK; i++) { |
Jonas Gorski | 68792e2 | 2013-03-12 00:13:46 +0100 | [diff] [blame] | 105 | if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 106 | clk_cfg = bcm63xx_spi_freq_table[i][1]; |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* No matching configuration found, default to lowest */ |
| 112 | if (i == SPI_CLK_MASK) |
| 113 | clk_cfg = SPI_CLK_0_391MHZ; |
| 114 | |
| 115 | /* clear existing clock configuration bits of the register */ |
| 116 | reg = bcm_spi_readb(bs, SPI_CLK_CFG); |
| 117 | reg &= ~SPI_CLK_MASK; |
| 118 | reg |= clk_cfg; |
| 119 | |
| 120 | bcm_spi_writeb(bs, reg, SPI_CLK_CFG); |
| 121 | dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", |
Jonas Gorski | 68792e2 | 2013-03-12 00:13:46 +0100 | [diff] [blame] | 122 | clk_cfg, t->speed_hz); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | /* the spi->mode bits understood by this driver: */ |
| 126 | #define MODEBITS (SPI_CPOL | SPI_CPHA) |
| 127 | |
| 128 | static int bcm63xx_spi_setup(struct spi_device *spi) |
| 129 | { |
Jonas Gorski | e2bdae0 | 2013-03-12 00:13:42 +0100 | [diff] [blame] | 130 | if (spi->bits_per_word != 8) { |
| 131 | dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", |
| 132 | __func__, spi->bits_per_word); |
| 133 | return -EINVAL; |
| 134 | } |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 135 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 136 | return 0; |
| 137 | } |
| 138 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 139 | static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, |
| 140 | unsigned int num_transfers) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 141 | { |
| 142 | struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); |
| 143 | u16 msg_ctl; |
| 144 | u16 cmd; |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 145 | u8 rx_tail; |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 146 | unsigned int i, timeout = 0, prepend_len = 0, len = 0; |
| 147 | struct spi_transfer *t = first; |
| 148 | bool do_rx = false; |
| 149 | bool do_tx = false; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 150 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 151 | /* Disable the CMD_DONE interrupt */ |
| 152 | bcm_spi_writeb(bs, 0, SPI_INT_MASK); |
| 153 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 154 | dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", |
| 155 | t->tx_buf, t->rx_buf, t->len); |
| 156 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 157 | if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) |
| 158 | prepend_len = t->len; |
| 159 | |
| 160 | /* prepare the buffer */ |
| 161 | for (i = 0; i < num_transfers; i++) { |
| 162 | if (t->tx_buf) { |
| 163 | do_tx = true; |
| 164 | memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); |
| 165 | |
| 166 | /* don't prepend more than one tx */ |
| 167 | if (t != first) |
| 168 | prepend_len = 0; |
| 169 | } |
| 170 | |
| 171 | if (t->rx_buf) { |
| 172 | do_rx = true; |
| 173 | /* prepend is half-duplex write only */ |
| 174 | if (t == first) |
| 175 | prepend_len = 0; |
| 176 | } |
| 177 | |
| 178 | len += t->len; |
| 179 | |
| 180 | t = list_entry(t->transfer_list.next, struct spi_transfer, |
| 181 | transfer_list); |
| 182 | } |
| 183 | |
| 184 | len -= prepend_len; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 185 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 186 | init_completion(&bs->done); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 187 | |
| 188 | /* Fill in the Message control register */ |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 189 | msg_ctl = (len << SPI_BYTE_CNT_SHIFT); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 190 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 191 | if (do_rx && do_tx && prepend_len == 0) |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 192 | msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 193 | else if (do_rx) |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 194 | msg_ctl |= (SPI_HD_R << bs->msg_type_shift); |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 195 | else if (do_tx) |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 196 | msg_ctl |= (SPI_HD_W << bs->msg_type_shift); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 197 | |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 198 | switch (bs->msg_ctl_width) { |
| 199 | case 8: |
| 200 | bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); |
| 201 | break; |
| 202 | case 16: |
| 203 | bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); |
| 204 | break; |
| 205 | } |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 206 | |
| 207 | /* Issue the transfer */ |
| 208 | cmd = SPI_CMD_START_IMMEDIATE; |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 209 | cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 210 | cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); |
| 211 | bcm_spi_writew(bs, cmd, SPI_CMD); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 212 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 213 | /* Enable the CMD_DONE interrupt */ |
| 214 | bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 215 | |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 216 | timeout = wait_for_completion_timeout(&bs->done, HZ); |
| 217 | if (!timeout) |
| 218 | return -ETIMEDOUT; |
| 219 | |
| 220 | /* read out all data */ |
| 221 | rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL); |
| 222 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 223 | if (do_rx && rx_tail != len) |
| 224 | return -EIO; |
| 225 | |
| 226 | if (!rx_tail) |
| 227 | return 0; |
| 228 | |
| 229 | len = 0; |
| 230 | t = first; |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 231 | /* Read out all the data */ |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 232 | for (i = 0; i < num_transfers; i++) { |
| 233 | if (t->rx_buf) |
| 234 | memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); |
| 235 | |
| 236 | if (t != first || prepend_len == 0) |
| 237 | len += t->len; |
| 238 | |
| 239 | t = list_entry(t->transfer_list.next, struct spi_transfer, |
| 240 | transfer_list); |
| 241 | } |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 242 | |
| 243 | return 0; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 244 | } |
| 245 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 246 | static int bcm63xx_spi_prepare_transfer(struct spi_master *master) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 247 | { |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 248 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 249 | |
| 250 | pm_runtime_get_sync(&bs->pdev->dev); |
| 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | static int bcm63xx_spi_unprepare_transfer(struct spi_master *master) |
| 256 | { |
| 257 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 258 | |
| 259 | pm_runtime_put(&bs->pdev->dev); |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | static int bcm63xx_spi_transfer_one(struct spi_master *master, |
| 265 | struct spi_message *m) |
| 266 | { |
| 267 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 268 | struct spi_transfer *t, *first = NULL; |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 269 | struct spi_device *spi = m->spi; |
| 270 | int status = 0; |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 271 | unsigned int n_transfers = 0, total_len = 0; |
| 272 | bool can_use_prepend = false; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 273 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 274 | /* |
| 275 | * This SPI controller does not support keeping CS active after a |
| 276 | * transfer. |
| 277 | * Work around this by merging as many transfers we can into one big |
| 278 | * full-duplex transfers. |
| 279 | */ |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 280 | list_for_each_entry(t, &m->transfers, transfer_list) { |
Jonas Gorski | c94df49 | 2013-03-12 00:13:45 +0100 | [diff] [blame] | 281 | if (t->bits_per_word != 8) { |
| 282 | dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", |
| 283 | __func__, t->bits_per_word); |
| 284 | status = -EINVAL; |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 285 | goto exit; |
Jonas Gorski | c94df49 | 2013-03-12 00:13:45 +0100 | [diff] [blame] | 286 | } |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 287 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 288 | if (!first) |
| 289 | first = t; |
| 290 | |
| 291 | n_transfers++; |
| 292 | total_len += t->len; |
| 293 | |
| 294 | if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && |
| 295 | first->len <= BCM63XX_SPI_MAX_PREPEND) |
| 296 | can_use_prepend = true; |
| 297 | else if (can_use_prepend && t->tx_buf) |
| 298 | can_use_prepend = false; |
| 299 | |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 300 | /* we can only transfer one fifo worth of data */ |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 301 | if ((can_use_prepend && |
| 302 | total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || |
| 303 | (!can_use_prepend && total_len > bs->fifo_size)) { |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 304 | dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 305 | total_len, bs->fifo_size); |
| 306 | status = -EINVAL; |
| 307 | goto exit; |
| 308 | } |
| 309 | |
| 310 | /* all combined transfers have to have the same speed */ |
| 311 | if (t->speed_hz != first->speed_hz) { |
| 312 | dev_err(&spi->dev, "unable to change speed between transfers\n"); |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 313 | status = -EINVAL; |
| 314 | goto exit; |
| 315 | } |
| 316 | |
| 317 | /* CS will be deasserted directly after transfer */ |
| 318 | if (t->delay_usecs) { |
| 319 | dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); |
| 320 | status = -EINVAL; |
| 321 | goto exit; |
| 322 | } |
| 323 | |
Jonas Gorski | b17de07 | 2013-02-03 15:15:13 +0100 | [diff] [blame] | 324 | if (t->cs_change || |
| 325 | list_is_last(&t->transfer_list, &m->transfers)) { |
| 326 | /* configure adapter for a new transfer */ |
| 327 | bcm63xx_spi_setup_transfer(spi, first); |
| 328 | |
| 329 | /* send the data */ |
| 330 | status = bcm63xx_txrx_bufs(spi, first, n_transfers); |
| 331 | if (status) |
| 332 | goto exit; |
| 333 | |
| 334 | m->actual_length += total_len; |
| 335 | |
| 336 | first = NULL; |
| 337 | n_transfers = 0; |
| 338 | total_len = 0; |
| 339 | can_use_prepend = false; |
Jonas Gorski | c0fde3b | 2013-02-03 15:15:12 +0100 | [diff] [blame] | 340 | } |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 341 | } |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 342 | exit: |
| 343 | m->status = status; |
| 344 | spi_finalize_current_message(master); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 345 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 346 | return 0; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | /* This driver supports single master mode only. Hence |
| 350 | * CMD_DONE is the only interrupt we care about |
| 351 | */ |
| 352 | static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) |
| 353 | { |
| 354 | struct spi_master *master = (struct spi_master *)dev_id; |
| 355 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 356 | u8 intr; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 357 | |
| 358 | /* Read interupts and clear them immediately */ |
| 359 | intr = bcm_spi_readb(bs, SPI_INT_STATUS); |
| 360 | bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); |
| 361 | bcm_spi_writeb(bs, 0, SPI_INT_MASK); |
| 362 | |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 363 | /* A transfer completed */ |
| 364 | if (intr & SPI_INTR_CMD_DONE) |
| 365 | complete(&bs->done); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 366 | |
| 367 | return IRQ_HANDLED; |
| 368 | } |
| 369 | |
| 370 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 371 | static int bcm63xx_spi_probe(struct platform_device *pdev) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 372 | { |
| 373 | struct resource *r; |
| 374 | struct device *dev = &pdev->dev; |
| 375 | struct bcm63xx_spi_pdata *pdata = pdev->dev.platform_data; |
| 376 | int irq; |
| 377 | struct spi_master *master; |
| 378 | struct clk *clk; |
| 379 | struct bcm63xx_spi *bs; |
| 380 | int ret; |
| 381 | |
| 382 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 383 | if (!r) { |
| 384 | dev_err(dev, "no iomem\n"); |
| 385 | ret = -ENXIO; |
| 386 | goto out; |
| 387 | } |
| 388 | |
| 389 | irq = platform_get_irq(pdev, 0); |
| 390 | if (irq < 0) { |
| 391 | dev_err(dev, "no irq\n"); |
| 392 | ret = -ENXIO; |
| 393 | goto out; |
| 394 | } |
| 395 | |
| 396 | clk = clk_get(dev, "spi"); |
| 397 | if (IS_ERR(clk)) { |
| 398 | dev_err(dev, "no clock for device\n"); |
| 399 | ret = PTR_ERR(clk); |
| 400 | goto out; |
| 401 | } |
| 402 | |
| 403 | master = spi_alloc_master(dev, sizeof(*bs)); |
| 404 | if (!master) { |
| 405 | dev_err(dev, "out of memory\n"); |
| 406 | ret = -ENOMEM; |
| 407 | goto out_clk; |
| 408 | } |
| 409 | |
| 410 | bs = spi_master_get_devdata(master); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 411 | |
| 412 | platform_set_drvdata(pdev, master); |
| 413 | bs->pdev = pdev; |
| 414 | |
Jonas Gorski | b66c773 | 2013-03-12 00:13:47 +0100 | [diff] [blame^] | 415 | bs->regs = devm_ioremap_resource(&pdev->dev, r); |
| 416 | if (IS_ERR(bs->regs)) { |
| 417 | ret = PTR_ERR(bs->regs); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 418 | goto out_err; |
| 419 | } |
| 420 | |
| 421 | bs->irq = irq; |
| 422 | bs->clk = clk; |
| 423 | bs->fifo_size = pdata->fifo_size; |
| 424 | |
| 425 | ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, |
| 426 | pdev->name, master); |
| 427 | if (ret) { |
| 428 | dev_err(dev, "unable to request irq\n"); |
| 429 | goto out_err; |
| 430 | } |
| 431 | |
| 432 | master->bus_num = pdata->bus_num; |
| 433 | master->num_chipselect = pdata->num_chipselect; |
| 434 | master->setup = bcm63xx_spi_setup; |
Florian Fainelli | cde4384 | 2012-04-20 15:37:33 +0200 | [diff] [blame] | 435 | master->prepare_transfer_hardware = bcm63xx_spi_prepare_transfer; |
| 436 | master->unprepare_transfer_hardware = bcm63xx_spi_unprepare_transfer; |
| 437 | master->transfer_one_message = bcm63xx_spi_transfer_one; |
Florian Fainelli | 88a3a25 | 2012-04-20 15:37:35 +0200 | [diff] [blame] | 438 | master->mode_bits = MODEBITS; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 439 | bs->speed_hz = pdata->speed_hz; |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 440 | bs->msg_type_shift = pdata->msg_type_shift; |
| 441 | bs->msg_ctl_width = pdata->msg_ctl_width; |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 442 | bs->tx_io = (u8 *)(bs->regs + bcm63xx_spireg(SPI_MSG_DATA)); |
| 443 | bs->rx_io = (const u8 *)(bs->regs + bcm63xx_spireg(SPI_RX_DATA)); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 444 | |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 445 | switch (bs->msg_ctl_width) { |
| 446 | case 8: |
| 447 | case 16: |
| 448 | break; |
| 449 | default: |
| 450 | dev_err(dev, "unsupported MSG_CTL width: %d\n", |
| 451 | bs->msg_ctl_width); |
Jonas Gorski | b435ff2 | 2013-03-12 00:13:37 +0100 | [diff] [blame] | 452 | goto out_err; |
Florian Fainelli | 5a67044 | 2012-06-18 12:07:51 +0200 | [diff] [blame] | 453 | } |
| 454 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 455 | /* Initialize hardware */ |
Jonas Gorski | 4fbb82a | 2013-03-12 00:13:38 +0100 | [diff] [blame] | 456 | clk_prepare_enable(bs->clk); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 457 | bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); |
| 458 | |
| 459 | /* register and we are done */ |
| 460 | ret = spi_register_master(master); |
| 461 | if (ret) { |
| 462 | dev_err(dev, "spi register failed\n"); |
| 463 | goto out_clk_disable; |
| 464 | } |
| 465 | |
Florian Fainelli | 61d1596 | 2012-10-03 11:56:53 +0200 | [diff] [blame] | 466 | dev_info(dev, "at 0x%08x (irq %d, FIFOs size %d)\n", |
| 467 | r->start, irq, bs->fifo_size); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 468 | |
| 469 | return 0; |
| 470 | |
| 471 | out_clk_disable: |
Jonas Gorski | 4fbb82a | 2013-03-12 00:13:38 +0100 | [diff] [blame] | 472 | clk_disable_unprepare(clk); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 473 | out_err: |
| 474 | platform_set_drvdata(pdev, NULL); |
| 475 | spi_master_put(master); |
| 476 | out_clk: |
| 477 | clk_put(clk); |
| 478 | out: |
| 479 | return ret; |
| 480 | } |
| 481 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 482 | static int bcm63xx_spi_remove(struct platform_device *pdev) |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 483 | { |
Guenter Roeck | 1f68237 | 2012-08-10 13:56:27 -0700 | [diff] [blame] | 484 | struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 485 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 486 | |
Florian Fainelli | 1e41dc0 | 2012-04-20 15:37:34 +0200 | [diff] [blame] | 487 | spi_unregister_master(master); |
| 488 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 489 | /* reset spi block */ |
| 490 | bcm_spi_writeb(bs, 0, SPI_INT_MASK); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 491 | |
| 492 | /* HW shutdown */ |
Jonas Gorski | 4fbb82a | 2013-03-12 00:13:38 +0100 | [diff] [blame] | 493 | clk_disable_unprepare(bs->clk); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 494 | clk_put(bs->clk); |
| 495 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 496 | platform_set_drvdata(pdev, 0); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 497 | |
Guenter Roeck | 1f68237 | 2012-08-10 13:56:27 -0700 | [diff] [blame] | 498 | spi_master_put(master); |
| 499 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | #ifdef CONFIG_PM |
| 504 | static int bcm63xx_spi_suspend(struct device *dev) |
| 505 | { |
| 506 | struct spi_master *master = |
| 507 | platform_get_drvdata(to_platform_device(dev)); |
| 508 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 509 | |
Florian Fainelli | 9651995 | 2012-10-03 11:56:54 +0200 | [diff] [blame] | 510 | spi_master_suspend(master); |
| 511 | |
Jonas Gorski | 4fbb82a | 2013-03-12 00:13:38 +0100 | [diff] [blame] | 512 | clk_disable_unprepare(bs->clk); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | static int bcm63xx_spi_resume(struct device *dev) |
| 518 | { |
| 519 | struct spi_master *master = |
| 520 | platform_get_drvdata(to_platform_device(dev)); |
| 521 | struct bcm63xx_spi *bs = spi_master_get_devdata(master); |
| 522 | |
Jonas Gorski | 4fbb82a | 2013-03-12 00:13:38 +0100 | [diff] [blame] | 523 | clk_prepare_enable(bs->clk); |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 524 | |
Florian Fainelli | 9651995 | 2012-10-03 11:56:54 +0200 | [diff] [blame] | 525 | spi_master_resume(master); |
| 526 | |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | static const struct dev_pm_ops bcm63xx_spi_pm_ops = { |
| 531 | .suspend = bcm63xx_spi_suspend, |
| 532 | .resume = bcm63xx_spi_resume, |
| 533 | }; |
| 534 | |
| 535 | #define BCM63XX_SPI_PM_OPS (&bcm63xx_spi_pm_ops) |
| 536 | #else |
| 537 | #define BCM63XX_SPI_PM_OPS NULL |
| 538 | #endif |
| 539 | |
| 540 | static struct platform_driver bcm63xx_spi_driver = { |
| 541 | .driver = { |
| 542 | .name = "bcm63xx-spi", |
| 543 | .owner = THIS_MODULE, |
| 544 | .pm = BCM63XX_SPI_PM_OPS, |
| 545 | }, |
| 546 | .probe = bcm63xx_spi_probe, |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 547 | .remove = bcm63xx_spi_remove, |
Florian Fainelli | b42dfed | 2012-02-01 11:14:09 +0100 | [diff] [blame] | 548 | }; |
| 549 | |
| 550 | module_platform_driver(bcm63xx_spi_driver); |
| 551 | |
| 552 | MODULE_ALIAS("platform:bcm63xx_spi"); |
| 553 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); |
| 554 | MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); |
| 555 | MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); |
| 556 | MODULE_LICENSE("GPL"); |