Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 2 | * Driver for the i2c controller on the Marvell line of host bridges |
| 3 | * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Author: Mark A. Greer <mgreer@mvista.com> |
| 6 | * |
| 7 | * 2005 (c) MontaVista, Software, Inc. This file is licensed under |
| 8 | * the terms of the GNU General Public License version 2. This program |
| 9 | * is licensed "as is" without any warranty of any kind, whether express |
| 10 | * or implied. |
| 11 | */ |
| 12 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 13 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/i2c.h> |
| 17 | #include <linux/interrupt.h> |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 18 | #include <linux/mv643xx_i2c.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 19 | #include <linux/platform_device.h> |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/io.h> |
| 22 | |
| 23 | /* Register defines */ |
| 24 | #define MV64XXX_I2C_REG_SLAVE_ADDR 0x00 |
| 25 | #define MV64XXX_I2C_REG_DATA 0x04 |
| 26 | #define MV64XXX_I2C_REG_CONTROL 0x08 |
| 27 | #define MV64XXX_I2C_REG_STATUS 0x0c |
| 28 | #define MV64XXX_I2C_REG_BAUD 0x0c |
| 29 | #define MV64XXX_I2C_REG_EXT_SLAVE_ADDR 0x10 |
| 30 | #define MV64XXX_I2C_REG_SOFT_RESET 0x1c |
| 31 | |
| 32 | #define MV64XXX_I2C_REG_CONTROL_ACK 0x00000004 |
| 33 | #define MV64XXX_I2C_REG_CONTROL_IFLG 0x00000008 |
| 34 | #define MV64XXX_I2C_REG_CONTROL_STOP 0x00000010 |
| 35 | #define MV64XXX_I2C_REG_CONTROL_START 0x00000020 |
| 36 | #define MV64XXX_I2C_REG_CONTROL_TWSIEN 0x00000040 |
| 37 | #define MV64XXX_I2C_REG_CONTROL_INTEN 0x00000080 |
| 38 | |
| 39 | /* Ctlr status values */ |
| 40 | #define MV64XXX_I2C_STATUS_BUS_ERR 0x00 |
| 41 | #define MV64XXX_I2C_STATUS_MAST_START 0x08 |
| 42 | #define MV64XXX_I2C_STATUS_MAST_REPEAT_START 0x10 |
| 43 | #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK 0x18 |
| 44 | #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK 0x20 |
| 45 | #define MV64XXX_I2C_STATUS_MAST_WR_ACK 0x28 |
| 46 | #define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK 0x30 |
| 47 | #define MV64XXX_I2C_STATUS_MAST_LOST_ARB 0x38 |
| 48 | #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK 0x40 |
| 49 | #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK 0x48 |
| 50 | #define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK 0x50 |
| 51 | #define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK 0x58 |
| 52 | #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK 0xd0 |
| 53 | #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK 0xd8 |
| 54 | #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK 0xe0 |
| 55 | #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK 0xe8 |
| 56 | #define MV64XXX_I2C_STATUS_NO_STATUS 0xf8 |
| 57 | |
| 58 | /* Driver states */ |
| 59 | enum { |
| 60 | MV64XXX_I2C_STATE_INVALID, |
| 61 | MV64XXX_I2C_STATE_IDLE, |
| 62 | MV64XXX_I2C_STATE_WAITING_FOR_START_COND, |
| 63 | MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK, |
| 64 | MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK, |
| 65 | MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK, |
| 66 | MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | /* Driver actions */ |
| 70 | enum { |
| 71 | MV64XXX_I2C_ACTION_INVALID, |
| 72 | MV64XXX_I2C_ACTION_CONTINUE, |
| 73 | MV64XXX_I2C_ACTION_SEND_START, |
| 74 | MV64XXX_I2C_ACTION_SEND_ADDR_1, |
| 75 | MV64XXX_I2C_ACTION_SEND_ADDR_2, |
| 76 | MV64XXX_I2C_ACTION_SEND_DATA, |
| 77 | MV64XXX_I2C_ACTION_RCV_DATA, |
| 78 | MV64XXX_I2C_ACTION_RCV_DATA_STOP, |
| 79 | MV64XXX_I2C_ACTION_SEND_STOP, |
| 80 | }; |
| 81 | |
| 82 | struct mv64xxx_i2c_data { |
| 83 | int irq; |
| 84 | u32 state; |
| 85 | u32 action; |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 86 | u32 aborting; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | u32 cntl_bits; |
| 88 | void __iomem *reg_base; |
| 89 | u32 reg_base_p; |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 90 | u32 reg_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | u32 addr1; |
| 92 | u32 addr2; |
| 93 | u32 bytes_left; |
| 94 | u32 byte_posn; |
| 95 | u32 block; |
| 96 | int rc; |
| 97 | u32 freq_m; |
| 98 | u32 freq_n; |
| 99 | wait_queue_head_t waitq; |
| 100 | spinlock_t lock; |
| 101 | struct i2c_msg *msg; |
| 102 | struct i2c_adapter adapter; |
| 103 | }; |
| 104 | |
| 105 | /* |
| 106 | ***************************************************************************** |
| 107 | * |
| 108 | * Finite State Machine & Interrupt Routines |
| 109 | * |
| 110 | ***************************************************************************** |
| 111 | */ |
Dale Farnsworth | a07ad1c | 2007-08-14 18:37:14 +0200 | [diff] [blame] | 112 | |
| 113 | /* Reset hardware and initialize FSM */ |
| 114 | static void |
| 115 | mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data) |
| 116 | { |
| 117 | writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET); |
| 118 | writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)), |
| 119 | drv_data->reg_base + MV64XXX_I2C_REG_BAUD); |
| 120 | writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR); |
| 121 | writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR); |
| 122 | writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP, |
| 123 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 124 | drv_data->state = MV64XXX_I2C_STATE_IDLE; |
| 125 | } |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | static void |
| 128 | mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status) |
| 129 | { |
| 130 | /* |
| 131 | * If state is idle, then this is likely the remnants of an old |
| 132 | * operation that driver has given up on or the user has killed. |
| 133 | * If so, issue the stop condition and go to idle. |
| 134 | */ |
| 135 | if (drv_data->state == MV64XXX_I2C_STATE_IDLE) { |
| 136 | drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; |
| 137 | return; |
| 138 | } |
| 139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | /* The status from the ctlr [mostly] tells us what to do next */ |
| 141 | switch (status) { |
| 142 | /* Start condition interrupt */ |
| 143 | case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */ |
| 144 | case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */ |
| 145 | drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1; |
| 146 | drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK; |
| 147 | break; |
| 148 | |
| 149 | /* Performing a write */ |
| 150 | case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */ |
| 151 | if (drv_data->msg->flags & I2C_M_TEN) { |
| 152 | drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2; |
| 153 | drv_data->state = |
| 154 | MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK; |
| 155 | break; |
| 156 | } |
| 157 | /* FALLTHRU */ |
| 158 | case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */ |
| 159 | case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */ |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 160 | if ((drv_data->bytes_left == 0) |
| 161 | || (drv_data->aborting |
| 162 | && (drv_data->byte_posn != 0))) { |
| 163 | drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; |
| 164 | drv_data->state = MV64XXX_I2C_STATE_IDLE; |
| 165 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA; |
| 167 | drv_data->state = |
| 168 | MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK; |
| 169 | drv_data->bytes_left--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | break; |
| 172 | |
| 173 | /* Performing a read */ |
| 174 | case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */ |
| 175 | if (drv_data->msg->flags & I2C_M_TEN) { |
| 176 | drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2; |
| 177 | drv_data->state = |
| 178 | MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK; |
| 179 | break; |
| 180 | } |
| 181 | /* FALLTHRU */ |
| 182 | case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */ |
| 183 | if (drv_data->bytes_left == 0) { |
| 184 | drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; |
| 185 | drv_data->state = MV64XXX_I2C_STATE_IDLE; |
| 186 | break; |
| 187 | } |
| 188 | /* FALLTHRU */ |
| 189 | case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */ |
| 190 | if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK) |
| 191 | drv_data->action = MV64XXX_I2C_ACTION_CONTINUE; |
| 192 | else { |
| 193 | drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA; |
| 194 | drv_data->bytes_left--; |
| 195 | } |
| 196 | drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA; |
| 197 | |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 198 | if ((drv_data->bytes_left == 1) || drv_data->aborting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK; |
| 200 | break; |
| 201 | |
| 202 | case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */ |
| 203 | drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP; |
| 204 | drv_data->state = MV64XXX_I2C_STATE_IDLE; |
| 205 | break; |
| 206 | |
| 207 | case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */ |
| 208 | case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */ |
| 209 | case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */ |
| 210 | /* Doesn't seem to be a device at other end */ |
| 211 | drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; |
| 212 | drv_data->state = MV64XXX_I2C_STATE_IDLE; |
| 213 | drv_data->rc = -ENODEV; |
| 214 | break; |
| 215 | |
| 216 | default: |
| 217 | dev_err(&drv_data->adapter.dev, |
| 218 | "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, " |
| 219 | "status: 0x%x, addr: 0x%x, flags: 0x%x\n", |
| 220 | drv_data->state, status, drv_data->msg->addr, |
| 221 | drv_data->msg->flags); |
| 222 | drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; |
Dale Farnsworth | a07ad1c | 2007-08-14 18:37:14 +0200 | [diff] [blame] | 223 | mv64xxx_i2c_hw_init(drv_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | drv_data->rc = -EIO; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | static void |
| 229 | mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data) |
| 230 | { |
| 231 | switch(drv_data->action) { |
| 232 | case MV64XXX_I2C_ACTION_CONTINUE: |
| 233 | writel(drv_data->cntl_bits, |
| 234 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 235 | break; |
| 236 | |
| 237 | case MV64XXX_I2C_ACTION_SEND_START: |
| 238 | writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START, |
| 239 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 240 | break; |
| 241 | |
| 242 | case MV64XXX_I2C_ACTION_SEND_ADDR_1: |
| 243 | writel(drv_data->addr1, |
| 244 | drv_data->reg_base + MV64XXX_I2C_REG_DATA); |
| 245 | writel(drv_data->cntl_bits, |
| 246 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 247 | break; |
| 248 | |
| 249 | case MV64XXX_I2C_ACTION_SEND_ADDR_2: |
| 250 | writel(drv_data->addr2, |
| 251 | drv_data->reg_base + MV64XXX_I2C_REG_DATA); |
| 252 | writel(drv_data->cntl_bits, |
| 253 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 254 | break; |
| 255 | |
| 256 | case MV64XXX_I2C_ACTION_SEND_DATA: |
| 257 | writel(drv_data->msg->buf[drv_data->byte_posn++], |
| 258 | drv_data->reg_base + MV64XXX_I2C_REG_DATA); |
| 259 | writel(drv_data->cntl_bits, |
| 260 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 261 | break; |
| 262 | |
| 263 | case MV64XXX_I2C_ACTION_RCV_DATA: |
| 264 | drv_data->msg->buf[drv_data->byte_posn++] = |
| 265 | readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA); |
| 266 | writel(drv_data->cntl_bits, |
| 267 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 268 | break; |
| 269 | |
| 270 | case MV64XXX_I2C_ACTION_RCV_DATA_STOP: |
| 271 | drv_data->msg->buf[drv_data->byte_posn++] = |
| 272 | readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA); |
| 273 | drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN; |
| 274 | writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP, |
| 275 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 276 | drv_data->block = 0; |
| 277 | wake_up_interruptible(&drv_data->waitq); |
| 278 | break; |
| 279 | |
| 280 | case MV64XXX_I2C_ACTION_INVALID: |
| 281 | default: |
| 282 | dev_err(&drv_data->adapter.dev, |
| 283 | "mv64xxx_i2c_do_action: Invalid action: %d\n", |
| 284 | drv_data->action); |
| 285 | drv_data->rc = -EIO; |
| 286 | /* FALLTHRU */ |
| 287 | case MV64XXX_I2C_ACTION_SEND_STOP: |
| 288 | drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN; |
| 289 | writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP, |
| 290 | drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); |
| 291 | drv_data->block = 0; |
| 292 | wake_up_interruptible(&drv_data->waitq); |
| 293 | break; |
| 294 | } |
| 295 | } |
| 296 | |
Mikael Pettersson | b0999cc | 2009-09-07 12:00:13 +0200 | [diff] [blame] | 297 | static irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 298 | mv64xxx_i2c_intr(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
| 300 | struct mv64xxx_i2c_data *drv_data = dev_id; |
| 301 | unsigned long flags; |
| 302 | u32 status; |
Mikael Pettersson | b0999cc | 2009-09-07 12:00:13 +0200 | [diff] [blame] | 303 | irqreturn_t rc = IRQ_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | spin_lock_irqsave(&drv_data->lock, flags); |
| 306 | while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) & |
| 307 | MV64XXX_I2C_REG_CONTROL_IFLG) { |
| 308 | status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS); |
| 309 | mv64xxx_i2c_fsm(drv_data, status); |
| 310 | mv64xxx_i2c_do_action(drv_data); |
| 311 | rc = IRQ_HANDLED; |
| 312 | } |
| 313 | spin_unlock_irqrestore(&drv_data->lock, flags); |
| 314 | |
| 315 | return rc; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | ***************************************************************************** |
| 320 | * |
| 321 | * I2C Msg Execution Routines |
| 322 | * |
| 323 | ***************************************************************************** |
| 324 | */ |
| 325 | static void |
| 326 | mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data, |
| 327 | struct i2c_msg *msg) |
| 328 | { |
| 329 | u32 dir = 0; |
| 330 | |
| 331 | drv_data->msg = msg; |
| 332 | drv_data->byte_posn = 0; |
| 333 | drv_data->bytes_left = msg->len; |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 334 | drv_data->aborting = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | drv_data->rc = 0; |
| 336 | drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK | |
| 337 | MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN; |
| 338 | |
| 339 | if (msg->flags & I2C_M_RD) |
| 340 | dir = 1; |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (msg->flags & I2C_M_TEN) { |
| 343 | drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir; |
| 344 | drv_data->addr2 = (u32)msg->addr & 0xff; |
| 345 | } else { |
| 346 | drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir; |
| 347 | drv_data->addr2 = 0; |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | static void |
| 352 | mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data) |
| 353 | { |
| 354 | long time_left; |
| 355 | unsigned long flags; |
| 356 | char abort = 0; |
| 357 | |
| 358 | time_left = wait_event_interruptible_timeout(drv_data->waitq, |
Jean Delvare | 8a52c6b | 2009-03-28 21:34:43 +0100 | [diff] [blame] | 359 | !drv_data->block, drv_data->adapter.timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | spin_lock_irqsave(&drv_data->lock, flags); |
| 362 | if (!time_left) { /* Timed out */ |
| 363 | drv_data->rc = -ETIMEDOUT; |
| 364 | abort = 1; |
| 365 | } else if (time_left < 0) { /* Interrupted/Error */ |
| 366 | drv_data->rc = time_left; /* errno value */ |
| 367 | abort = 1; |
| 368 | } |
| 369 | |
| 370 | if (abort && drv_data->block) { |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 371 | drv_data->aborting = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | spin_unlock_irqrestore(&drv_data->lock, flags); |
| 373 | |
| 374 | time_left = wait_event_timeout(drv_data->waitq, |
Jean Delvare | 8a52c6b | 2009-03-28 21:34:43 +0100 | [diff] [blame] | 375 | !drv_data->block, drv_data->adapter.timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 377 | if ((time_left <= 0) && drv_data->block) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | drv_data->state = MV64XXX_I2C_STATE_IDLE; |
| 379 | dev_err(&drv_data->adapter.dev, |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 380 | "mv64xxx: I2C bus locked, block: %d, " |
| 381 | "time_left: %d\n", drv_data->block, |
| 382 | (int)time_left); |
Dale Farnsworth | a07ad1c | 2007-08-14 18:37:14 +0200 | [diff] [blame] | 383 | mv64xxx_i2c_hw_init(drv_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | } |
| 385 | } else |
| 386 | spin_unlock_irqrestore(&drv_data->lock, flags); |
| 387 | } |
| 388 | |
| 389 | static int |
| 390 | mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg) |
| 391 | { |
| 392 | unsigned long flags; |
| 393 | |
| 394 | spin_lock_irqsave(&drv_data->lock, flags); |
| 395 | mv64xxx_i2c_prepare_for_io(drv_data, msg); |
| 396 | |
| 397 | if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */ |
| 398 | if (drv_data->msg->flags & I2C_M_RD) { |
| 399 | /* No action to do, wait for slave to send a byte */ |
| 400 | drv_data->action = MV64XXX_I2C_ACTION_CONTINUE; |
| 401 | drv_data->state = |
| 402 | MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA; |
| 403 | } else { |
| 404 | drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA; |
| 405 | drv_data->state = |
| 406 | MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK; |
| 407 | drv_data->bytes_left--; |
| 408 | } |
| 409 | } else { |
| 410 | drv_data->action = MV64XXX_I2C_ACTION_SEND_START; |
| 411 | drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND; |
| 412 | } |
| 413 | |
| 414 | drv_data->block = 1; |
| 415 | mv64xxx_i2c_do_action(drv_data); |
| 416 | spin_unlock_irqrestore(&drv_data->lock, flags); |
| 417 | |
| 418 | mv64xxx_i2c_wait_for_completion(drv_data); |
| 419 | return drv_data->rc; |
| 420 | } |
| 421 | |
| 422 | /* |
| 423 | ***************************************************************************** |
| 424 | * |
| 425 | * I2C Core Support Routines (Interface to higher level I2C code) |
| 426 | * |
| 427 | ***************************************************************************** |
| 428 | */ |
| 429 | static u32 |
| 430 | mv64xxx_i2c_functionality(struct i2c_adapter *adap) |
| 431 | { |
| 432 | return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL; |
| 433 | } |
| 434 | |
| 435 | static int |
| 436 | mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) |
| 437 | { |
| 438 | struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap); |
Jean Delvare | d1b2f0a | 2005-09-02 21:25:47 +0200 | [diff] [blame] | 439 | int i, rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
| 441 | for (i=0; i<num; i++) |
Jean Delvare | d1b2f0a | 2005-09-02 21:25:47 +0200 | [diff] [blame] | 442 | if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) < 0) |
| 443 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
Jean Delvare | d1b2f0a | 2005-09-02 21:25:47 +0200 | [diff] [blame] | 445 | return num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 448 | static const struct i2c_algorithm mv64xxx_i2c_algo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | .master_xfer = mv64xxx_i2c_xfer, |
| 450 | .functionality = mv64xxx_i2c_functionality, |
| 451 | }; |
| 452 | |
| 453 | /* |
| 454 | ***************************************************************************** |
| 455 | * |
| 456 | * Driver Interface & Early Init Routines |
| 457 | * |
| 458 | ***************************************************************************** |
| 459 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | static int __devinit |
| 461 | mv64xxx_i2c_map_regs(struct platform_device *pd, |
| 462 | struct mv64xxx_i2c_data *drv_data) |
| 463 | { |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 464 | int size; |
| 465 | struct resource *r = platform_get_resource(pd, IORESOURCE_MEM, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 467 | if (!r) |
| 468 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Linus Walleij | c6ffdde | 2009-06-14 00:20:36 +0200 | [diff] [blame] | 470 | size = resource_size(r); |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 471 | |
| 472 | if (!request_mem_region(r->start, size, drv_data->adapter.name)) |
| 473 | return -EBUSY; |
| 474 | |
| 475 | drv_data->reg_base = ioremap(r->start, size); |
| 476 | drv_data->reg_base_p = r->start; |
| 477 | drv_data->reg_size = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | return 0; |
| 480 | } |
| 481 | |
Russell King | bdf602b | 2009-03-03 13:43:47 +0000 | [diff] [blame] | 482 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data) |
| 484 | { |
| 485 | if (drv_data->reg_base) { |
| 486 | iounmap(drv_data->reg_base); |
Tzachi Perelstein | a083279 | 2007-11-12 19:38:51 +0200 | [diff] [blame] | 487 | release_mem_region(drv_data->reg_base_p, drv_data->reg_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | drv_data->reg_base = NULL; |
| 491 | drv_data->reg_base_p = 0; |
| 492 | } |
| 493 | |
| 494 | static int __devinit |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 495 | mv64xxx_i2c_probe(struct platform_device *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | struct mv64xxx_i2c_data *drv_data; |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 498 | struct mv64xxx_i2c_pdata *pdata = pd->dev.platform_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | int rc; |
| 500 | |
| 501 | if ((pd->id != 0) || !pdata) |
| 502 | return -ENODEV; |
| 503 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 504 | drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | if (!drv_data) |
| 506 | return -ENOMEM; |
| 507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | if (mv64xxx_i2c_map_regs(pd, drv_data)) { |
| 509 | rc = -ENODEV; |
| 510 | goto exit_kfree; |
| 511 | } |
| 512 | |
Mark A. Greer | e91c021 | 2005-12-18 17:22:01 +0100 | [diff] [blame] | 513 | strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter", |
David Brownell | 2096b95 | 2007-05-01 23:26:28 +0200 | [diff] [blame] | 514 | sizeof(drv_data->adapter.name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | init_waitqueue_head(&drv_data->waitq); |
| 517 | spin_lock_init(&drv_data->lock); |
| 518 | |
| 519 | drv_data->freq_m = pdata->freq_m; |
| 520 | drv_data->freq_n = pdata->freq_n; |
| 521 | drv_data->irq = platform_get_irq(pd, 0); |
David Vrabel | 4894473 | 2006-01-19 17:56:29 +0000 | [diff] [blame] | 522 | if (drv_data->irq < 0) { |
| 523 | rc = -ENXIO; |
| 524 | goto exit_unmap_regs; |
| 525 | } |
Jean Delvare | 12a917f | 2007-02-13 22:09:03 +0100 | [diff] [blame] | 526 | drv_data->adapter.dev.parent = &pd->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | drv_data->adapter.algo = &mv64xxx_i2c_algo; |
| 528 | drv_data->adapter.owner = THIS_MODULE; |
Jean Delvare | 3401b2f | 2008-07-14 22:38:29 +0200 | [diff] [blame] | 529 | drv_data->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; |
Jean Delvare | 8a52c6b | 2009-03-28 21:34:43 +0100 | [diff] [blame] | 530 | drv_data->adapter.timeout = msecs_to_jiffies(pdata->timeout); |
Dale Farnsworth | 65b22ad | 2007-07-12 14:12:29 +0200 | [diff] [blame] | 531 | drv_data->adapter.nr = pd->id; |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 532 | platform_set_drvdata(pd, drv_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | i2c_set_adapdata(&drv_data->adapter, drv_data); |
| 534 | |
Maxime Bizon | 3269bb6 | 2007-01-05 17:54:05 +0100 | [diff] [blame] | 535 | mv64xxx_i2c_hw_init(drv_data); |
| 536 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0, |
Mark A. Greer | dfded4a | 2005-12-16 11:08:43 -0800 | [diff] [blame] | 538 | MV64XXX_I2C_CTLR_NAME, drv_data)) { |
| 539 | dev_err(&drv_data->adapter.dev, |
| 540 | "mv64xxx: Can't register intr handler irq: %d\n", |
| 541 | drv_data->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | rc = -EINVAL; |
| 543 | goto exit_unmap_regs; |
Dale Farnsworth | 65b22ad | 2007-07-12 14:12:29 +0200 | [diff] [blame] | 544 | } else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) { |
Mark A. Greer | dfded4a | 2005-12-16 11:08:43 -0800 | [diff] [blame] | 545 | dev_err(&drv_data->adapter.dev, |
| 546 | "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | goto exit_free_irq; |
| 548 | } |
| 549 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | return 0; |
| 551 | |
| 552 | exit_free_irq: |
| 553 | free_irq(drv_data->irq, drv_data); |
| 554 | exit_unmap_regs: |
| 555 | mv64xxx_i2c_unmap_regs(drv_data); |
| 556 | exit_kfree: |
| 557 | kfree(drv_data); |
| 558 | return rc; |
| 559 | } |
| 560 | |
| 561 | static int __devexit |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 562 | mv64xxx_i2c_remove(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 564 | struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | int rc; |
| 566 | |
| 567 | rc = i2c_del_adapter(&drv_data->adapter); |
| 568 | free_irq(drv_data->irq, drv_data); |
| 569 | mv64xxx_i2c_unmap_regs(drv_data); |
| 570 | kfree(drv_data); |
| 571 | |
| 572 | return rc; |
| 573 | } |
| 574 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 575 | static struct platform_driver mv64xxx_i2c_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | .probe = mv64xxx_i2c_probe, |
Russell King | bdf602b | 2009-03-03 13:43:47 +0000 | [diff] [blame] | 577 | .remove = __devexit_p(mv64xxx_i2c_remove), |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 578 | .driver = { |
| 579 | .owner = THIS_MODULE, |
| 580 | .name = MV64XXX_I2C_CTLR_NAME, |
| 581 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | }; |
| 583 | |
| 584 | static int __init |
| 585 | mv64xxx_i2c_init(void) |
| 586 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 587 | return platform_driver_register(&mv64xxx_i2c_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | static void __exit |
| 591 | mv64xxx_i2c_exit(void) |
| 592 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 593 | platform_driver_unregister(&mv64xxx_i2c_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | module_init(mv64xxx_i2c_init); |
| 597 | module_exit(mv64xxx_i2c_exit); |
| 598 | |
| 599 | MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>"); |
| 600 | MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver"); |
| 601 | MODULE_LICENSE("GPL"); |