Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * drivers/i2c/busses/i2c-ibm_iic.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Support for the IIC peripheral on IBM PPC 4xx |
| 5 | * |
| 6 | * Copyright (c) 2003, 2004 Zultys Technologies. |
| 7 | * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> |
| 8 | * |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 9 | * Based on original work by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * Ian DaSilva <idasilva@mvista.com> |
| 11 | * Armin Kuster <akuster@mvista.com> |
| 12 | * Matt Porter <mporter@mvista.com> |
| 13 | * |
| 14 | * Copyright 2000-2003 MontaVista Software Inc. |
| 15 | * |
| 16 | * Original driver version was highly leveraged from i2c-elektor.c |
| 17 | * |
| 18 | * Copyright 1995-97 Simon G. Vogl |
| 19 | * 1998-99 Hans Berglund |
| 20 | * |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 21 | * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | * and even Frodo Looijaard <frodol@dds.nl> |
| 23 | * |
| 24 | * This program is free software; you can redistribute it and/or modify it |
| 25 | * under the terms of the GNU General Public License as published by the |
| 26 | * Free Software Foundation; either version 2 of the License, or (at your |
| 27 | * option) any later version. |
| 28 | * |
| 29 | */ |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/module.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/ioport.h> |
| 34 | #include <linux/delay.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <asm/irq.h> |
| 39 | #include <asm/io.h> |
| 40 | #include <linux/i2c.h> |
| 41 | #include <linux/i2c-id.h> |
| 42 | #include <asm/ocp.h> |
| 43 | #include <asm/ibm4xx.h> |
| 44 | |
| 45 | #include "i2c-ibm_iic.h" |
| 46 | |
| 47 | #define DRIVER_VERSION "2.1" |
| 48 | |
| 49 | MODULE_DESCRIPTION("IBM IIC driver v" DRIVER_VERSION); |
| 50 | MODULE_LICENSE("GPL"); |
| 51 | |
| 52 | static int iic_force_poll; |
| 53 | module_param(iic_force_poll, bool, 0); |
| 54 | MODULE_PARM_DESC(iic_force_poll, "Force polling mode"); |
| 55 | |
| 56 | static int iic_force_fast; |
| 57 | module_param(iic_force_fast, bool, 0); |
| 58 | MODULE_PARM_DESC(iic_fast_poll, "Force fast mode (400 kHz)"); |
| 59 | |
| 60 | #define DBG_LEVEL 0 |
| 61 | |
| 62 | #ifdef DBG |
| 63 | #undef DBG |
| 64 | #endif |
| 65 | |
| 66 | #ifdef DBG2 |
| 67 | #undef DBG2 |
| 68 | #endif |
| 69 | |
| 70 | #if DBG_LEVEL > 0 |
| 71 | # define DBG(f,x...) printk(KERN_DEBUG "ibm-iic" f, ##x) |
| 72 | #else |
| 73 | # define DBG(f,x...) ((void)0) |
| 74 | #endif |
| 75 | #if DBG_LEVEL > 1 |
| 76 | # define DBG2(f,x...) DBG(f, ##x) |
| 77 | #else |
| 78 | # define DBG2(f,x...) ((void)0) |
| 79 | #endif |
| 80 | #if DBG_LEVEL > 2 |
| 81 | static void dump_iic_regs(const char* header, struct ibm_iic_private* dev) |
| 82 | { |
| 83 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 84 | printk(KERN_DEBUG "ibm-iic%d: %s\n", dev->idx, header); |
| 85 | printk(KERN_DEBUG " cntl = 0x%02x, mdcntl = 0x%02x\n" |
| 86 | KERN_DEBUG " sts = 0x%02x, extsts = 0x%02x\n" |
| 87 | KERN_DEBUG " clkdiv = 0x%02x, xfrcnt = 0x%02x\n" |
| 88 | KERN_DEBUG " xtcntlss = 0x%02x, directcntl = 0x%02x\n", |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 89 | in_8(&iic->cntl), in_8(&iic->mdcntl), in_8(&iic->sts), |
| 90 | in_8(&iic->extsts), in_8(&iic->clkdiv), in_8(&iic->xfrcnt), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | in_8(&iic->xtcntlss), in_8(&iic->directcntl)); |
| 92 | } |
| 93 | # define DUMP_REGS(h,dev) dump_iic_regs((h),(dev)) |
| 94 | #else |
| 95 | # define DUMP_REGS(h,dev) ((void)0) |
| 96 | #endif |
| 97 | |
| 98 | /* Bus timings (in ns) for bit-banging */ |
| 99 | static struct i2c_timings { |
| 100 | unsigned int hd_sta; |
| 101 | unsigned int su_sto; |
| 102 | unsigned int low; |
| 103 | unsigned int high; |
| 104 | unsigned int buf; |
| 105 | } timings [] = { |
| 106 | /* Standard mode (100 KHz) */ |
| 107 | { |
| 108 | .hd_sta = 4000, |
| 109 | .su_sto = 4000, |
| 110 | .low = 4700, |
| 111 | .high = 4000, |
| 112 | .buf = 4700, |
| 113 | }, |
| 114 | /* Fast mode (400 KHz) */ |
| 115 | { |
| 116 | .hd_sta = 600, |
| 117 | .su_sto = 600, |
| 118 | .low = 1300, |
| 119 | .high = 600, |
| 120 | .buf = 1300, |
| 121 | }}; |
| 122 | |
| 123 | /* Enable/disable interrupt generation */ |
| 124 | static inline void iic_interrupt_mode(struct ibm_iic_private* dev, int enable) |
| 125 | { |
| 126 | out_8(&dev->vaddr->intmsk, enable ? INTRMSK_EIMTC : 0); |
| 127 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | /* |
| 130 | * Initialize IIC interface. |
| 131 | */ |
| 132 | static void iic_dev_init(struct ibm_iic_private* dev) |
| 133 | { |
| 134 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 135 | |
| 136 | DBG("%d: init\n", dev->idx); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* Clear master address */ |
| 139 | out_8(&iic->lmadr, 0); |
| 140 | out_8(&iic->hmadr, 0); |
| 141 | |
| 142 | /* Clear slave address */ |
| 143 | out_8(&iic->lsadr, 0); |
| 144 | out_8(&iic->hsadr, 0); |
| 145 | |
| 146 | /* Clear status & extended status */ |
| 147 | out_8(&iic->sts, STS_SCMP | STS_IRQA); |
| 148 | out_8(&iic->extsts, EXTSTS_IRQP | EXTSTS_IRQD | EXTSTS_LA |
| 149 | | EXTSTS_ICT | EXTSTS_XFRA); |
| 150 | |
| 151 | /* Set clock divider */ |
| 152 | out_8(&iic->clkdiv, dev->clckdiv); |
| 153 | |
| 154 | /* Clear transfer count */ |
| 155 | out_8(&iic->xfrcnt, 0); |
| 156 | |
| 157 | /* Clear extended control and status */ |
| 158 | out_8(&iic->xtcntlss, XTCNTLSS_SRC | XTCNTLSS_SRS | XTCNTLSS_SWC |
| 159 | | XTCNTLSS_SWS); |
| 160 | |
| 161 | /* Clear control register */ |
| 162 | out_8(&iic->cntl, 0); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | /* Enable interrupts if possible */ |
| 165 | iic_interrupt_mode(dev, dev->irq >= 0); |
| 166 | |
| 167 | /* Set mode control */ |
| 168 | out_8(&iic->mdcntl, MDCNTL_FMDB | MDCNTL_EINT | MDCNTL_EUBS |
| 169 | | (dev->fast_mode ? MDCNTL_FSM : 0)); |
| 170 | |
| 171 | DUMP_REGS("iic_init", dev); |
| 172 | } |
| 173 | |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 174 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | * Reset IIC interface |
| 176 | */ |
| 177 | static void iic_dev_reset(struct ibm_iic_private* dev) |
| 178 | { |
| 179 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 180 | int i; |
| 181 | u8 dc; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | DBG("%d: soft reset\n", dev->idx); |
| 184 | DUMP_REGS("reset", dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | /* Place chip in the reset state */ |
| 187 | out_8(&iic->xtcntlss, XTCNTLSS_SRST); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | /* Check if bus is free */ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 190 | dc = in_8(&iic->directcntl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (!DIRCTNL_FREE(dc)){ |
| 192 | DBG("%d: trying to regain bus control\n", dev->idx); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | /* Try to set bus free state */ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 195 | out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC); |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* Wait until we regain bus control */ |
| 198 | for (i = 0; i < 100; ++i){ |
| 199 | dc = in_8(&iic->directcntl); |
| 200 | if (DIRCTNL_FREE(dc)) |
| 201 | break; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | /* Toggle SCL line */ |
| 204 | dc ^= DIRCNTL_SCC; |
| 205 | out_8(&iic->directcntl, dc); |
| 206 | udelay(10); |
| 207 | dc ^= DIRCNTL_SCC; |
| 208 | out_8(&iic->directcntl, dc); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | /* be nice */ |
| 211 | cond_resched(); |
| 212 | } |
| 213 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | /* Remove reset */ |
| 216 | out_8(&iic->xtcntlss, 0); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | /* Reinitialize interface */ |
| 219 | iic_dev_init(dev); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Do 0-length transaction using bit-banging through IIC_DIRECTCNTL register. |
| 224 | */ |
| 225 | |
| 226 | /* Wait for SCL and/or SDA to be high */ |
| 227 | static int iic_dc_wait(volatile struct iic_regs __iomem *iic, u8 mask) |
| 228 | { |
| 229 | unsigned long x = jiffies + HZ / 28 + 2; |
| 230 | while ((in_8(&iic->directcntl) & mask) != mask){ |
| 231 | if (unlikely(time_after(jiffies, x))) |
| 232 | return -1; |
| 233 | cond_resched(); |
| 234 | } |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int iic_smbus_quick(struct ibm_iic_private* dev, const struct i2c_msg* p) |
| 239 | { |
| 240 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 241 | const struct i2c_timings* t = &timings[dev->fast_mode ? 1 : 0]; |
| 242 | u8 mask, v, sda; |
| 243 | int i, res; |
| 244 | |
| 245 | /* Only 7-bit addresses are supported */ |
| 246 | if (unlikely(p->flags & I2C_M_TEN)){ |
| 247 | DBG("%d: smbus_quick - 10 bit addresses are not supported\n", |
| 248 | dev->idx); |
| 249 | return -EINVAL; |
| 250 | } |
| 251 | |
| 252 | DBG("%d: smbus_quick(0x%02x)\n", dev->idx, p->addr); |
| 253 | |
| 254 | /* Reset IIC interface */ |
| 255 | out_8(&iic->xtcntlss, XTCNTLSS_SRST); |
| 256 | |
| 257 | /* Wait for bus to become free */ |
| 258 | out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC); |
| 259 | if (unlikely(iic_dc_wait(iic, DIRCNTL_MSDA | DIRCNTL_MSC))) |
| 260 | goto err; |
| 261 | ndelay(t->buf); |
| 262 | |
| 263 | /* START */ |
| 264 | out_8(&iic->directcntl, DIRCNTL_SCC); |
| 265 | sda = 0; |
| 266 | ndelay(t->hd_sta); |
| 267 | |
| 268 | /* Send address */ |
| 269 | v = (u8)((p->addr << 1) | ((p->flags & I2C_M_RD) ? 1 : 0)); |
| 270 | for (i = 0, mask = 0x80; i < 8; ++i, mask >>= 1){ |
| 271 | out_8(&iic->directcntl, sda); |
| 272 | ndelay(t->low / 2); |
| 273 | sda = (v & mask) ? DIRCNTL_SDAC : 0; |
| 274 | out_8(&iic->directcntl, sda); |
| 275 | ndelay(t->low / 2); |
| 276 | |
| 277 | out_8(&iic->directcntl, DIRCNTL_SCC | sda); |
| 278 | if (unlikely(iic_dc_wait(iic, DIRCNTL_MSC))) |
| 279 | goto err; |
| 280 | ndelay(t->high); |
| 281 | } |
| 282 | |
| 283 | /* ACK */ |
| 284 | out_8(&iic->directcntl, sda); |
| 285 | ndelay(t->low / 2); |
| 286 | out_8(&iic->directcntl, DIRCNTL_SDAC); |
| 287 | ndelay(t->low / 2); |
| 288 | out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC); |
| 289 | if (unlikely(iic_dc_wait(iic, DIRCNTL_MSC))) |
| 290 | goto err; |
| 291 | res = (in_8(&iic->directcntl) & DIRCNTL_MSDA) ? -EREMOTEIO : 1; |
| 292 | ndelay(t->high); |
| 293 | |
| 294 | /* STOP */ |
| 295 | out_8(&iic->directcntl, 0); |
| 296 | ndelay(t->low); |
| 297 | out_8(&iic->directcntl, DIRCNTL_SCC); |
| 298 | if (unlikely(iic_dc_wait(iic, DIRCNTL_MSC))) |
| 299 | goto err; |
| 300 | ndelay(t->su_sto); |
| 301 | out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC); |
| 302 | |
| 303 | ndelay(t->buf); |
| 304 | |
| 305 | DBG("%d: smbus_quick -> %s\n", dev->idx, res ? "NACK" : "ACK"); |
| 306 | out: |
| 307 | /* Remove reset */ |
| 308 | out_8(&iic->xtcntlss, 0); |
| 309 | |
| 310 | /* Reinitialize interface */ |
| 311 | iic_dev_init(dev); |
| 312 | |
| 313 | return res; |
| 314 | err: |
| 315 | DBG("%d: smbus_quick - bus is stuck\n", dev->idx); |
| 316 | res = -EREMOTEIO; |
| 317 | goto out; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * IIC interrupt handler |
| 322 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 323 | static irqreturn_t iic_handler(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | { |
| 325 | struct ibm_iic_private* dev = (struct ibm_iic_private*)dev_id; |
| 326 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 327 | |
| 328 | DBG2("%d: irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | dev->idx, in_8(&iic->sts), in_8(&iic->extsts)); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | /* Acknowledge IRQ and wakeup iic_wait_for_tc */ |
| 332 | out_8(&iic->sts, STS_IRQA | STS_SCMP); |
| 333 | wake_up_interruptible(&dev->wq); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | return IRQ_HANDLED; |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * Get master transfer result and clear errors if any. |
| 340 | * Returns the number of actually transferred bytes or error (<0) |
| 341 | */ |
| 342 | static int iic_xfer_result(struct ibm_iic_private* dev) |
| 343 | { |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 344 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (unlikely(in_8(&iic->sts) & STS_ERR)){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 347 | DBG("%d: xfer error, EXTSTS = 0x%02x\n", dev->idx, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | in_8(&iic->extsts)); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | /* Clear errors and possible pending IRQs */ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 351 | out_8(&iic->extsts, EXTSTS_IRQP | EXTSTS_IRQD | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | EXTSTS_LA | EXTSTS_ICT | EXTSTS_XFRA); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | /* Flush master data buffer */ |
| 355 | out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* Is bus free? |
| 358 | * If error happened during combined xfer |
| 359 | * IIC interface is usually stuck in some strange |
| 360 | * state, the only way out - soft reset. |
| 361 | */ |
| 362 | if ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){ |
| 363 | DBG("%d: bus is stuck, resetting\n", dev->idx); |
| 364 | iic_dev_reset(dev); |
| 365 | } |
| 366 | return -EREMOTEIO; |
| 367 | } |
| 368 | else |
| 369 | return in_8(&iic->xfrcnt) & XFRCNT_MTC_MASK; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Try to abort active transfer. |
| 374 | */ |
| 375 | static void iic_abort_xfer(struct ibm_iic_private* dev) |
| 376 | { |
| 377 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 378 | unsigned long x; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | DBG("%d: iic_abort_xfer\n", dev->idx); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | out_8(&iic->cntl, CNTL_HMT); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | /* |
| 385 | * Wait for the abort command to complete. |
| 386 | * It's not worth to be optimized, just poll (timeout >= 1 tick) |
| 387 | */ |
| 388 | x = jiffies + 2; |
| 389 | while ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){ |
| 390 | if (time_after(jiffies, x)){ |
| 391 | DBG("%d: abort timeout, resetting...\n", dev->idx); |
| 392 | iic_dev_reset(dev); |
| 393 | return; |
| 394 | } |
| 395 | schedule(); |
| 396 | } |
| 397 | |
| 398 | /* Just to clear errors */ |
| 399 | iic_xfer_result(dev); |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Wait for master transfer to complete. |
| 404 | * It puts current process to sleep until we get interrupt or timeout expires. |
| 405 | * Returns the number of transferred bytes or error (<0) |
| 406 | */ |
| 407 | static int iic_wait_for_tc(struct ibm_iic_private* dev){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 410 | int ret = 0; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | if (dev->irq >= 0){ |
| 413 | /* Interrupt mode */ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 414 | ret = wait_event_interruptible_timeout(dev->wq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | !(in_8(&iic->sts) & STS_PT), dev->adap.timeout * HZ); |
| 416 | |
| 417 | if (unlikely(ret < 0)) |
| 418 | DBG("%d: wait interrupted\n", dev->idx); |
| 419 | else if (unlikely(in_8(&iic->sts) & STS_PT)){ |
| 420 | DBG("%d: wait timeout\n", dev->idx); |
| 421 | ret = -ETIMEDOUT; |
| 422 | } |
| 423 | } |
| 424 | else { |
| 425 | /* Polling mode */ |
| 426 | unsigned long x = jiffies + dev->adap.timeout * HZ; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | while (in_8(&iic->sts) & STS_PT){ |
| 429 | if (unlikely(time_after(jiffies, x))){ |
| 430 | DBG("%d: poll timeout\n", dev->idx); |
| 431 | ret = -ETIMEDOUT; |
| 432 | break; |
| 433 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (unlikely(signal_pending(current))){ |
| 436 | DBG("%d: poll interrupted\n", dev->idx); |
| 437 | ret = -ERESTARTSYS; |
| 438 | break; |
| 439 | } |
| 440 | schedule(); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 441 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | if (unlikely(ret < 0)) |
| 445 | iic_abort_xfer(dev); |
| 446 | else |
| 447 | ret = iic_xfer_result(dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | DBG2("%d: iic_wait_for_tc -> %d\n", dev->idx, ret); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | return ret; |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Low level master transfer routine |
| 456 | */ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 457 | static int iic_xfer_bytes(struct ibm_iic_private* dev, struct i2c_msg* pm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | int combined_xfer) |
| 459 | { |
| 460 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 461 | char* buf = pm->buf; |
| 462 | int i, j, loops, ret = 0; |
| 463 | int len = pm->len; |
| 464 | |
| 465 | u8 cntl = (in_8(&iic->cntl) & CNTL_AMD) | CNTL_PT; |
| 466 | if (pm->flags & I2C_M_RD) |
| 467 | cntl |= CNTL_RW; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | loops = (len + 3) / 4; |
| 470 | for (i = 0; i < loops; ++i, len -= 4){ |
| 471 | int count = len > 4 ? 4 : len; |
| 472 | u8 cmd = cntl | ((count - 1) << CNTL_TCT_SHIFT); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (!(cntl & CNTL_RW)) |
| 475 | for (j = 0; j < count; ++j) |
| 476 | out_8((void __iomem *)&iic->mdbuf, *buf++); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | if (i < loops - 1) |
| 479 | cmd |= CNTL_CHT; |
| 480 | else if (combined_xfer) |
| 481 | cmd |= CNTL_RPST; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | DBG2("%d: xfer_bytes, %d, CNTL = 0x%02x\n", dev->idx, count, cmd); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | /* Start transfer */ |
| 486 | out_8(&iic->cntl, cmd); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | /* Wait for completion */ |
| 489 | ret = iic_wait_for_tc(dev); |
| 490 | |
| 491 | if (unlikely(ret < 0)) |
| 492 | break; |
| 493 | else if (unlikely(ret != count)){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 494 | DBG("%d: xfer_bytes, requested %d, transfered %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | dev->idx, count, ret); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | /* If it's not a last part of xfer, abort it */ |
| 498 | if (combined_xfer || (i < loops - 1)) |
| 499 | iic_abort_xfer(dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | ret = -EREMOTEIO; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 502 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | if (cntl & CNTL_RW) |
| 506 | for (j = 0; j < count; ++j) |
| 507 | *buf++ = in_8((void __iomem *)&iic->mdbuf); |
| 508 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | return ret > 0 ? 0 : ret; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * Set target slave address for master transfer |
| 515 | */ |
| 516 | static inline void iic_address(struct ibm_iic_private* dev, struct i2c_msg* msg) |
| 517 | { |
| 518 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 519 | u16 addr = msg->addr; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 520 | |
| 521 | DBG2("%d: iic_address, 0x%03x (%d-bit)\n", dev->idx, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | addr, msg->flags & I2C_M_TEN ? 10 : 7); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | if (msg->flags & I2C_M_TEN){ |
| 525 | out_8(&iic->cntl, CNTL_AMD); |
| 526 | out_8(&iic->lmadr, addr); |
| 527 | out_8(&iic->hmadr, 0xf0 | ((addr >> 7) & 0x06)); |
| 528 | } |
| 529 | else { |
| 530 | out_8(&iic->cntl, 0); |
| 531 | out_8(&iic->lmadr, addr << 1); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | static inline int iic_invalid_address(const struct i2c_msg* p) |
| 536 | { |
| 537 | return (p->addr > 0x3ff) || (!(p->flags & I2C_M_TEN) && (p->addr > 0x7f)); |
| 538 | } |
| 539 | |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 540 | static inline int iic_address_neq(const struct i2c_msg* p1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | const struct i2c_msg* p2) |
| 542 | { |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 543 | return (p1->addr != p2->addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | || ((p1->flags & I2C_M_TEN) != (p2->flags & I2C_M_TEN)); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 545 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | /* |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 548 | * Generic master transfer entrypoint. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | * Returns the number of processed messages or error (<0) |
| 550 | */ |
| 551 | static int iic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) |
| 552 | { |
| 553 | struct ibm_iic_private* dev = (struct ibm_iic_private*)(i2c_get_adapdata(adap)); |
| 554 | volatile struct iic_regs __iomem *iic = dev->vaddr; |
| 555 | int i, ret = 0; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | DBG2("%d: iic_xfer, %d msg(s)\n", dev->idx, num); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (!num) |
| 560 | return 0; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | /* Check the sanity of the passed messages. |
| 563 | * Uhh, generic i2c layer is more suitable place for such code... |
| 564 | */ |
| 565 | if (unlikely(iic_invalid_address(&msgs[0]))){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 566 | DBG("%d: invalid address 0x%03x (%d-bit)\n", dev->idx, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | msgs[0].addr, msgs[0].flags & I2C_M_TEN ? 10 : 7); |
| 568 | return -EINVAL; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | for (i = 0; i < num; ++i){ |
| 571 | if (unlikely(msgs[i].len <= 0)){ |
| 572 | if (num == 1 && !msgs[0].len){ |
| 573 | /* Special case for I2C_SMBUS_QUICK emulation. |
| 574 | * IBM IIC doesn't support 0-length transactions |
| 575 | * so we have to emulate them using bit-banging. |
| 576 | */ |
| 577 | return iic_smbus_quick(dev, &msgs[0]); |
| 578 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 579 | DBG("%d: invalid len %d in msg[%d]\n", dev->idx, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | msgs[i].len, i); |
| 581 | return -EINVAL; |
| 582 | } |
| 583 | if (unlikely(iic_address_neq(&msgs[0], &msgs[i]))){ |
| 584 | DBG("%d: invalid addr in msg[%d]\n", dev->idx, i); |
| 585 | return -EINVAL; |
| 586 | } |
| 587 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | /* Check bus state */ |
| 590 | if (unlikely((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE)){ |
| 591 | DBG("%d: iic_xfer, bus is not free\n", dev->idx); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | /* Usually it means something serious has happend. |
| 594 | * We *cannot* have unfinished previous transfer |
| 595 | * so it doesn't make any sense to try to stop it. |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 596 | * Probably we were not able to recover from the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | * previous error. |
| 598 | * The only *reasonable* thing I can think of here |
| 599 | * is soft reset. --ebs |
| 600 | */ |
| 601 | iic_dev_reset(dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | if ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){ |
| 604 | DBG("%d: iic_xfer, bus is still not free\n", dev->idx); |
| 605 | return -EREMOTEIO; |
| 606 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 607 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | else { |
| 609 | /* Flush master data buffer (just in case) */ |
| 610 | out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB); |
| 611 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /* Load slave address */ |
| 614 | iic_address(dev, &msgs[0]); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | /* Do real transfer */ |
| 617 | for (i = 0; i < num && !ret; ++i) |
| 618 | ret = iic_xfer_bytes(dev, &msgs[i], i < num - 1); |
| 619 | |
| 620 | return ret < 0 ? ret : num; |
| 621 | } |
| 622 | |
| 623 | static u32 iic_func(struct i2c_adapter *adap) |
| 624 | { |
| 625 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; |
| 626 | } |
| 627 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 628 | static const struct i2c_algorithm iic_algo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | .master_xfer = iic_xfer, |
| 630 | .functionality = iic_func |
| 631 | }; |
| 632 | |
| 633 | /* |
| 634 | * Calculates IICx_CLCKDIV value for a specific OPB clock frequency |
| 635 | */ |
| 636 | static inline u8 iic_clckdiv(unsigned int opb) |
| 637 | { |
| 638 | /* Compatibility kludge, should go away after all cards |
| 639 | * are fixed to fill correct value for opbfreq. |
| 640 | * Previous driver version used hardcoded divider value 4, |
| 641 | * it corresponds to OPB frequency from the range (40, 50] MHz |
| 642 | */ |
| 643 | if (!opb){ |
| 644 | printk(KERN_WARNING "ibm-iic: using compatibility value for OPB freq," |
| 645 | " fix your board specific setup\n"); |
| 646 | opb = 50000000; |
| 647 | } |
| 648 | |
| 649 | /* Convert to MHz */ |
| 650 | opb /= 1000000; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (opb < 20 || opb > 150){ |
| 653 | printk(KERN_CRIT "ibm-iic: invalid OPB clock frequency %u MHz\n", |
| 654 | opb); |
| 655 | opb = opb < 20 ? 20 : 150; |
| 656 | } |
| 657 | return (u8)((opb + 9) / 10 - 1); |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * Register single IIC interface |
| 662 | */ |
| 663 | static int __devinit iic_probe(struct ocp_device *ocp){ |
| 664 | |
| 665 | struct ibm_iic_private* dev; |
| 666 | struct i2c_adapter* adap; |
| 667 | struct ocp_func_iic_data* iic_data = ocp->def->additions; |
| 668 | int ret; |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | if (!iic_data) |
| 671 | printk(KERN_WARNING"ibm-iic%d: missing additional data!\n", |
| 672 | ocp->def->index); |
| 673 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 674 | if (!(dev = kzalloc(sizeof(*dev), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | printk(KERN_CRIT "ibm-iic%d: failed to allocate device data\n", |
| 676 | ocp->def->index); |
| 677 | return -ENOMEM; |
| 678 | } |
| 679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | dev->idx = ocp->def->index; |
| 681 | ocp_set_drvdata(ocp, dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 682 | |
Jean-Baptiste Maneyrol | 31c095b | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 683 | if (!request_mem_region(ocp->def->paddr, sizeof(struct iic_regs), |
| 684 | "ibm_iic")) { |
| 685 | ret = -EBUSY; |
| 686 | goto fail1; |
| 687 | } |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | if (!(dev->vaddr = ioremap(ocp->def->paddr, sizeof(struct iic_regs)))){ |
| 690 | printk(KERN_CRIT "ibm-iic%d: failed to ioremap device registers\n", |
| 691 | dev->idx); |
| 692 | ret = -ENXIO; |
| 693 | goto fail2; |
| 694 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | init_waitqueue_head(&dev->wq); |
| 697 | |
| 698 | dev->irq = iic_force_poll ? -1 : ocp->def->irq; |
| 699 | if (dev->irq >= 0){ |
Steven Cole | 44bbe87 | 2005-05-03 18:21:25 -0600 | [diff] [blame] | 700 | /* Disable interrupts until we finish initialization, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | assumes level-sensitive IRQ setup... |
| 702 | */ |
| 703 | iic_interrupt_mode(dev, 0); |
| 704 | if (request_irq(dev->irq, iic_handler, 0, "IBM IIC", dev)){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 705 | printk(KERN_ERR "ibm-iic%d: request_irq %d failed\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | dev->idx, dev->irq); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 707 | /* Fallback to the polling mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | dev->irq = -1; |
| 709 | } |
| 710 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | if (dev->irq < 0) |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 713 | printk(KERN_WARNING "ibm-iic%d: using polling mode\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | dev->idx); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | /* Board specific settings */ |
| 717 | dev->fast_mode = iic_force_fast ? 1 : (iic_data ? iic_data->fast_mode : 0); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 718 | |
| 719 | /* clckdiv is the same for *all* IIC interfaces, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | * but I'd rather make a copy than introduce another global. --ebs |
| 721 | */ |
| 722 | dev->clckdiv = iic_clckdiv(ocp_sys_info.opb_bus_freq); |
| 723 | DBG("%d: clckdiv = %d\n", dev->idx, dev->clckdiv); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | /* Initialize IIC interface */ |
| 726 | iic_dev_init(dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | /* Register it with i2c layer */ |
| 729 | adap = &dev->adap; |
Jean Delvare | 12a917f | 2007-02-13 22:09:03 +0100 | [diff] [blame] | 730 | adap->dev.parent = &ocp->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | strcpy(adap->name, "IBM IIC"); |
| 732 | i2c_set_adapdata(adap, dev); |
Jean Delvare | c7a4653 | 2005-08-11 23:41:56 +0200 | [diff] [blame] | 733 | adap->id = I2C_HW_OCP; |
Martin Hicks | a4787c0 | 2005-12-18 17:18:01 +0100 | [diff] [blame] | 734 | adap->class = I2C_CLASS_HWMON; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | adap->algo = &iic_algo; |
| 736 | adap->client_register = NULL; |
| 737 | adap->client_unregister = NULL; |
| 738 | adap->timeout = 1; |
| 739 | adap->retries = 1; |
| 740 | |
Stefan Roese | 7589a32 | 2007-10-13 23:56:30 +0200 | [diff] [blame] | 741 | /* |
| 742 | * If "dev->idx" is negative we consider it as zero. |
| 743 | * The reason to do so is to avoid sysfs names that only make |
| 744 | * sense when there are multiple adapters. |
| 745 | */ |
| 746 | adap->nr = dev->idx >= 0 ? dev->idx : 0; |
| 747 | |
| 748 | if ((ret = i2c_add_numbered_adapter(adap)) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | printk(KERN_CRIT "ibm-iic%d: failed to register i2c adapter\n", |
| 750 | dev->idx); |
| 751 | goto fail; |
| 752 | } |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | printk(KERN_INFO "ibm-iic%d: using %s mode\n", dev->idx, |
| 755 | dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)"); |
| 756 | |
| 757 | return 0; |
| 758 | |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 759 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | if (dev->irq >= 0){ |
| 761 | iic_interrupt_mode(dev, 0); |
| 762 | free_irq(dev->irq, dev); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | iounmap(dev->vaddr); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 766 | fail2: |
Jean-Baptiste Maneyrol | 31c095b | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 767 | release_mem_region(ocp->def->paddr, sizeof(struct iic_regs)); |
| 768 | fail1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | ocp_set_drvdata(ocp, NULL); |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 770 | kfree(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | return ret; |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Cleanup initialized IIC interface |
| 776 | */ |
| 777 | static void __devexit iic_remove(struct ocp_device *ocp) |
| 778 | { |
| 779 | struct ibm_iic_private* dev = (struct ibm_iic_private*)ocp_get_drvdata(ocp); |
| 780 | BUG_ON(dev == NULL); |
| 781 | if (i2c_del_adapter(&dev->adap)){ |
| 782 | printk(KERN_CRIT "ibm-iic%d: failed to delete i2c adapter :(\n", |
| 783 | dev->idx); |
| 784 | /* That's *very* bad, just shutdown IRQ ... */ |
| 785 | if (dev->irq >= 0){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 786 | iic_interrupt_mode(dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | free_irq(dev->irq, dev); |
| 788 | dev->irq = -1; |
| 789 | } |
| 790 | } else { |
| 791 | if (dev->irq >= 0){ |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 792 | iic_interrupt_mode(dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | free_irq(dev->irq, dev); |
| 794 | } |
| 795 | iounmap(dev->vaddr); |
Jean-Baptiste Maneyrol | 31c095b | 2006-12-10 21:21:29 +0100 | [diff] [blame] | 796 | release_mem_region(ocp->def->paddr, sizeof(struct iic_regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | kfree(dev); |
| 798 | } |
| 799 | } |
| 800 | |
Stefan Roese | 217bcec | 2008-01-27 18:14:45 +0100 | [diff] [blame^] | 801 | static struct ocp_device_id ibm_iic_ids[] __devinitdata = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
| 803 | { .vendor = OCP_VENDOR_IBM, .function = OCP_FUNC_IIC }, |
| 804 | { .vendor = OCP_VENDOR_INVALID } |
| 805 | }; |
| 806 | |
| 807 | MODULE_DEVICE_TABLE(ocp, ibm_iic_ids); |
| 808 | |
| 809 | static struct ocp_driver ibm_iic_driver = |
| 810 | { |
| 811 | .name = "iic", |
| 812 | .id_table = ibm_iic_ids, |
| 813 | .probe = iic_probe, |
| 814 | .remove = __devexit_p(iic_remove), |
| 815 | #if defined(CONFIG_PM) |
| 816 | .suspend = NULL, |
| 817 | .resume = NULL, |
| 818 | #endif |
| 819 | }; |
| 820 | |
| 821 | static int __init iic_init(void) |
| 822 | { |
| 823 | printk(KERN_INFO "IBM IIC driver v" DRIVER_VERSION "\n"); |
| 824 | return ocp_register_driver(&ibm_iic_driver); |
| 825 | } |
| 826 | |
| 827 | static void __exit iic_exit(void) |
| 828 | { |
| 829 | ocp_unregister_driver(&ibm_iic_driver); |
| 830 | } |
| 831 | |
| 832 | module_init(iic_init); |
| 833 | module_exit(iic_exit); |