Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 2 | * arch/powerpc/platforms/powermac/low_i2c.c |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 3 | * |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 4 | * Copyright (C) 2003-2005 Ben. Herrenschmidt (benh@kernel.crashing.org) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 11 | * The linux i2c layer isn't completely suitable for our needs for various |
| 12 | * reasons ranging from too late initialisation to semantics not perfectly |
| 13 | * matching some requirements of the apple platform functions etc... |
| 14 | * |
| 15 | * This file thus provides a simple low level unified i2c interface for |
| 16 | * powermac that covers the various types of i2c busses used in Apple machines. |
| 17 | * For now, keywest, PMU and SMU, though we could add Cuda, or other bit |
| 18 | * banging busses found on older chipstes in earlier machines if we ever need |
| 19 | * one of them. |
| 20 | * |
| 21 | * The drivers in this file are synchronous/blocking. In addition, the |
| 22 | * keywest one is fairly slow due to the use of msleep instead of interrupts |
| 23 | * as the interrupt is currently used by i2c-keywest. In the long run, we |
| 24 | * might want to get rid of those high-level interfaces to linux i2c layer |
| 25 | * either completely (converting all drivers) or replacing them all with a |
| 26 | * single stub driver on top of this one. Once done, the interrupt will be |
| 27 | * available for our use. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 28 | */ |
| 29 | |
| 30 | #undef DEBUG |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 31 | #undef DEBUG_LOW |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 32 | |
| 33 | #include <linux/config.h> |
| 34 | #include <linux/types.h> |
| 35 | #include <linux/sched.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/adb.h> |
| 39 | #include <linux/pmu.h> |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 40 | #include <linux/delay.h> |
| 41 | #include <linux/completion.h> |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 42 | #include <linux/platform_device.h> |
| 43 | #include <linux/interrupt.h> |
| 44 | #include <linux/completion.h> |
| 45 | #include <linux/timer.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 46 | #include <asm/keylargo.h> |
| 47 | #include <asm/uninorth.h> |
| 48 | #include <asm/io.h> |
| 49 | #include <asm/prom.h> |
| 50 | #include <asm/machdep.h> |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 51 | #include <asm/smu.h> |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 52 | #include <asm/pmac_pfunc.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 53 | #include <asm/pmac_low_i2c.h> |
| 54 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 55 | #ifdef DEBUG |
| 56 | #define DBG(x...) do {\ |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 57 | printk(KERN_DEBUG "low_i2c:" x); \ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 58 | } while(0) |
| 59 | #else |
| 60 | #define DBG(x...) |
| 61 | #endif |
| 62 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 63 | #ifdef DEBUG_LOW |
| 64 | #define DBG_LOW(x...) do {\ |
| 65 | printk(KERN_DEBUG "low_i2c:" x); \ |
| 66 | } while(0) |
| 67 | #else |
| 68 | #define DBG_LOW(x...) |
| 69 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 70 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 71 | |
| 72 | static int pmac_i2c_force_poll = 1; |
| 73 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 74 | /* |
| 75 | * A bus structure. Each bus in the system has such a structure associated. |
| 76 | */ |
| 77 | struct pmac_i2c_bus |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 78 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 79 | struct list_head link; |
| 80 | struct device_node *controller; |
| 81 | struct device_node *busnode; |
| 82 | int type; |
| 83 | int flags; |
| 84 | struct i2c_adapter *adapter; |
| 85 | void *hostdata; |
| 86 | int channel; /* some hosts have multiple */ |
| 87 | int mode; /* current mode */ |
| 88 | struct semaphore sem; |
| 89 | int opened; |
| 90 | int polled; /* open mode */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 91 | struct platform_device *platform_dev; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 92 | |
| 93 | /* ops */ |
| 94 | int (*open)(struct pmac_i2c_bus *bus); |
| 95 | void (*close)(struct pmac_i2c_bus *bus); |
| 96 | int (*xfer)(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 97 | u32 subaddr, u8 *data, int len); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 98 | }; |
| 99 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 100 | static LIST_HEAD(pmac_i2c_busses); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 101 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 102 | /* |
| 103 | * Keywest implementation |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 104 | */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 105 | |
| 106 | struct pmac_i2c_host_kw |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 107 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 108 | struct semaphore mutex; /* Access mutex for use by |
| 109 | * i2c-keywest */ |
| 110 | void __iomem *base; /* register base address */ |
| 111 | int bsteps; /* register stepping */ |
| 112 | int speed; /* speed */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 113 | int irq; |
| 114 | u8 *data; |
| 115 | unsigned len; |
| 116 | int state; |
| 117 | int rw; |
| 118 | int polled; |
| 119 | int result; |
| 120 | struct completion complete; |
| 121 | spinlock_t lock; |
| 122 | struct timer_list timeout_timer; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 123 | }; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 124 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 125 | /* Register indices */ |
| 126 | typedef enum { |
| 127 | reg_mode = 0, |
| 128 | reg_control, |
| 129 | reg_status, |
| 130 | reg_isr, |
| 131 | reg_ier, |
| 132 | reg_addr, |
| 133 | reg_subaddr, |
| 134 | reg_data |
| 135 | } reg_t; |
| 136 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 137 | /* The Tumbler audio equalizer can be really slow sometimes */ |
| 138 | #define KW_POLL_TIMEOUT (2*HZ) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 139 | |
| 140 | /* Mode register */ |
| 141 | #define KW_I2C_MODE_100KHZ 0x00 |
| 142 | #define KW_I2C_MODE_50KHZ 0x01 |
| 143 | #define KW_I2C_MODE_25KHZ 0x02 |
| 144 | #define KW_I2C_MODE_DUMB 0x00 |
| 145 | #define KW_I2C_MODE_STANDARD 0x04 |
| 146 | #define KW_I2C_MODE_STANDARDSUB 0x08 |
| 147 | #define KW_I2C_MODE_COMBINED 0x0C |
| 148 | #define KW_I2C_MODE_MODE_MASK 0x0C |
| 149 | #define KW_I2C_MODE_CHAN_MASK 0xF0 |
| 150 | |
| 151 | /* Control register */ |
| 152 | #define KW_I2C_CTL_AAK 0x01 |
| 153 | #define KW_I2C_CTL_XADDR 0x02 |
| 154 | #define KW_I2C_CTL_STOP 0x04 |
| 155 | #define KW_I2C_CTL_START 0x08 |
| 156 | |
| 157 | /* Status register */ |
| 158 | #define KW_I2C_STAT_BUSY 0x01 |
| 159 | #define KW_I2C_STAT_LAST_AAK 0x02 |
| 160 | #define KW_I2C_STAT_LAST_RW 0x04 |
| 161 | #define KW_I2C_STAT_SDA 0x08 |
| 162 | #define KW_I2C_STAT_SCL 0x10 |
| 163 | |
| 164 | /* IER & ISR registers */ |
| 165 | #define KW_I2C_IRQ_DATA 0x01 |
| 166 | #define KW_I2C_IRQ_ADDR 0x02 |
| 167 | #define KW_I2C_IRQ_STOP 0x04 |
| 168 | #define KW_I2C_IRQ_START 0x08 |
| 169 | #define KW_I2C_IRQ_MASK 0x0F |
| 170 | |
| 171 | /* State machine states */ |
| 172 | enum { |
| 173 | state_idle, |
| 174 | state_addr, |
| 175 | state_read, |
| 176 | state_write, |
| 177 | state_stop, |
| 178 | state_dead |
| 179 | }; |
| 180 | |
| 181 | #define WRONG_STATE(name) do {\ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 182 | printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s " \ |
| 183 | "(isr: %02x)\n", \ |
| 184 | name, __kw_state_names[host->state], isr); \ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 185 | } while(0) |
| 186 | |
| 187 | static const char *__kw_state_names[] = { |
| 188 | "state_idle", |
| 189 | "state_addr", |
| 190 | "state_read", |
| 191 | "state_write", |
| 192 | "state_stop", |
| 193 | "state_dead" |
| 194 | }; |
| 195 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 196 | static inline u8 __kw_read_reg(struct pmac_i2c_host_kw *host, reg_t reg) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 197 | { |
| 198 | return readb(host->base + (((unsigned int)reg) << host->bsteps)); |
| 199 | } |
| 200 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 201 | static inline void __kw_write_reg(struct pmac_i2c_host_kw *host, |
| 202 | reg_t reg, u8 val) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 203 | { |
| 204 | writeb(val, host->base + (((unsigned)reg) << host->bsteps)); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 205 | (void)__kw_read_reg(host, reg_subaddr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 206 | } |
| 207 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 208 | #define kw_write_reg(reg, val) __kw_write_reg(host, reg, val) |
| 209 | #define kw_read_reg(reg) __kw_read_reg(host, reg) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 210 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 211 | static u8 kw_i2c_wait_interrupt(struct pmac_i2c_host_kw *host) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 212 | { |
| 213 | int i, j; |
| 214 | u8 isr; |
| 215 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 216 | for (i = 0; i < 1000; i++) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 217 | isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK; |
| 218 | if (isr != 0) |
| 219 | return isr; |
| 220 | |
| 221 | /* This code is used with the timebase frozen, we cannot rely |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 222 | * on udelay nor schedule when in polled mode ! |
| 223 | * For now, just use a bogus loop.... |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 224 | */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 225 | if (host->polled) { |
| 226 | for (j = 1; j < 100000; j++) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 227 | mb(); |
| 228 | } else |
| 229 | msleep(1); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 230 | } |
| 231 | return isr; |
| 232 | } |
| 233 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 234 | static void kw_i2c_handle_interrupt(struct pmac_i2c_host_kw *host, u8 isr) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 235 | { |
| 236 | u8 ack; |
| 237 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 238 | DBG_LOW("kw_handle_interrupt(%s, isr: %x)\n", |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 239 | __kw_state_names[host->state], isr); |
| 240 | |
| 241 | if (host->state == state_idle) { |
| 242 | printk(KERN_WARNING "low_i2c: Keywest got an out of state" |
| 243 | " interrupt, ignoring\n"); |
| 244 | kw_write_reg(reg_isr, isr); |
| 245 | return; |
| 246 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 247 | |
| 248 | if (isr == 0) { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 249 | if (host->state != state_stop) { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 250 | DBG_LOW("KW: Timeout !\n"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 251 | host->result = -EIO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 252 | goto stop; |
| 253 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 254 | if (host->state == state_stop) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 255 | ack = kw_read_reg(reg_status); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 256 | if (ack & KW_I2C_STAT_BUSY) |
| 257 | kw_write_reg(reg_status, 0); |
| 258 | host->state = state_idle; |
| 259 | kw_write_reg(reg_ier, 0x00); |
| 260 | if (!host->polled) |
| 261 | complete(&host->complete); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 262 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 263 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | if (isr & KW_I2C_IRQ_ADDR) { |
| 267 | ack = kw_read_reg(reg_status); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 268 | if (host->state != state_addr) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 269 | kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR); |
| 270 | WRONG_STATE("KW_I2C_IRQ_ADDR"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 271 | host->result = -EIO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 272 | goto stop; |
| 273 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 274 | if ((ack & KW_I2C_STAT_LAST_AAK) == 0) { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 275 | host->result = -ENODEV; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 276 | DBG_LOW("KW: NAK on address\n"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 277 | host->state = state_stop; |
| 278 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 279 | } else { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 280 | if (host->len == 0) { |
| 281 | kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR); |
| 282 | goto stop; |
| 283 | } |
| 284 | if (host->rw) { |
| 285 | host->state = state_read; |
| 286 | if (host->len > 1) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 287 | kw_write_reg(reg_control, |
| 288 | KW_I2C_CTL_AAK); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 289 | } else { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 290 | host->state = state_write; |
| 291 | kw_write_reg(reg_data, *(host->data++)); |
| 292 | host->len--; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 293 | } |
| 294 | } |
| 295 | kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR); |
| 296 | } |
| 297 | |
| 298 | if (isr & KW_I2C_IRQ_DATA) { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 299 | if (host->state == state_read) { |
| 300 | *(host->data++) = kw_read_reg(reg_data); |
| 301 | host->len--; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 302 | kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 303 | if (host->len == 0) |
| 304 | host->state = state_stop; |
| 305 | else if (host->len == 1) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 306 | kw_write_reg(reg_control, 0); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 307 | } else if (host->state == state_write) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 308 | ack = kw_read_reg(reg_status); |
| 309 | if ((ack & KW_I2C_STAT_LAST_AAK) == 0) { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 310 | DBG_LOW("KW: nack on data write\n"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 311 | host->result = -EIO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 312 | goto stop; |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 313 | } else if (host->len) { |
| 314 | kw_write_reg(reg_data, *(host->data++)); |
| 315 | host->len--; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 316 | } else { |
| 317 | kw_write_reg(reg_control, KW_I2C_CTL_STOP); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 318 | host->state = state_stop; |
| 319 | host->result = 0; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 320 | } |
| 321 | kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); |
| 322 | } else { |
| 323 | kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); |
| 324 | WRONG_STATE("KW_I2C_IRQ_DATA"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 325 | if (host->state != state_stop) { |
| 326 | host->result = -EIO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 327 | goto stop; |
| 328 | } |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | if (isr & KW_I2C_IRQ_STOP) { |
| 333 | kw_write_reg(reg_isr, KW_I2C_IRQ_STOP); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 334 | if (host->state != state_stop) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 335 | WRONG_STATE("KW_I2C_IRQ_STOP"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 336 | host->result = -EIO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 337 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 338 | host->state = state_idle; |
| 339 | if (!host->polled) |
| 340 | complete(&host->complete); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | if (isr & KW_I2C_IRQ_START) |
| 344 | kw_write_reg(reg_isr, KW_I2C_IRQ_START); |
| 345 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 346 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 347 | stop: |
| 348 | kw_write_reg(reg_control, KW_I2C_CTL_STOP); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 349 | host->state = state_stop; |
| 350 | return; |
| 351 | } |
| 352 | |
| 353 | /* Interrupt handler */ |
| 354 | static irqreturn_t kw_i2c_irq(int irq, void *dev_id, struct pt_regs *regs) |
| 355 | { |
| 356 | struct pmac_i2c_host_kw *host = dev_id; |
| 357 | unsigned long flags; |
| 358 | |
| 359 | spin_lock_irqsave(&host->lock, flags); |
| 360 | del_timer(&host->timeout_timer); |
| 361 | kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr)); |
| 362 | if (host->state != state_idle) { |
| 363 | host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; |
| 364 | add_timer(&host->timeout_timer); |
| 365 | } |
| 366 | spin_unlock_irqrestore(&host->lock, flags); |
| 367 | return IRQ_HANDLED; |
| 368 | } |
| 369 | |
| 370 | static void kw_i2c_timeout(unsigned long data) |
| 371 | { |
| 372 | struct pmac_i2c_host_kw *host = (struct pmac_i2c_host_kw *)data; |
| 373 | unsigned long flags; |
| 374 | |
| 375 | spin_lock_irqsave(&host->lock, flags); |
| 376 | kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr)); |
| 377 | if (host->state != state_idle) { |
| 378 | host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; |
| 379 | add_timer(&host->timeout_timer); |
| 380 | } |
| 381 | spin_unlock_irqrestore(&host->lock, flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 382 | } |
| 383 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 384 | static int kw_i2c_open(struct pmac_i2c_bus *bus) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 385 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 386 | struct pmac_i2c_host_kw *host = bus->hostdata; |
| 387 | down(&host->mutex); |
| 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | static void kw_i2c_close(struct pmac_i2c_bus *bus) |
| 392 | { |
| 393 | struct pmac_i2c_host_kw *host = bus->hostdata; |
| 394 | up(&host->mutex); |
| 395 | } |
| 396 | |
| 397 | static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 398 | u32 subaddr, u8 *data, int len) |
| 399 | { |
| 400 | struct pmac_i2c_host_kw *host = bus->hostdata; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 401 | u8 mode_reg = host->speed; |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 402 | int use_irq = host->irq != NO_IRQ && !bus->polled; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 403 | |
| 404 | /* Setup mode & subaddress if any */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 405 | switch(bus->mode) { |
| 406 | case pmac_i2c_mode_dumb: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 407 | return -EINVAL; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 408 | case pmac_i2c_mode_std: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 409 | mode_reg |= KW_I2C_MODE_STANDARD; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 410 | if (subsize != 0) |
| 411 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 412 | break; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 413 | case pmac_i2c_mode_stdsub: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 414 | mode_reg |= KW_I2C_MODE_STANDARDSUB; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 415 | if (subsize != 1) |
| 416 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 417 | break; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 418 | case pmac_i2c_mode_combined: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 419 | mode_reg |= KW_I2C_MODE_COMBINED; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 420 | if (subsize != 1) |
| 421 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 422 | break; |
| 423 | } |
| 424 | |
| 425 | /* Setup channel & clear pending irqs */ |
| 426 | kw_write_reg(reg_isr, kw_read_reg(reg_isr)); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 427 | kw_write_reg(reg_mode, mode_reg | (bus->channel << 4)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 428 | kw_write_reg(reg_status, 0); |
| 429 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 430 | /* Set up address and r/w bit, strip possible stale bus number from |
| 431 | * address top bits |
| 432 | */ |
| 433 | kw_write_reg(reg_addr, addrdir & 0xff); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 434 | |
| 435 | /* Set up the sub address */ |
| 436 | if ((mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB |
| 437 | || (mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED) |
| 438 | kw_write_reg(reg_subaddr, subaddr); |
| 439 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 440 | /* Prepare for async operations */ |
| 441 | host->data = data; |
| 442 | host->len = len; |
| 443 | host->state = state_addr; |
| 444 | host->result = 0; |
| 445 | host->rw = (addrdir & 1); |
| 446 | host->polled = bus->polled; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 447 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 448 | /* Enable interrupt if not using polled mode and interrupt is |
| 449 | * available |
| 450 | */ |
| 451 | if (use_irq) { |
| 452 | /* Clear completion */ |
| 453 | INIT_COMPLETION(host->complete); |
| 454 | /* Ack stale interrupts */ |
| 455 | kw_write_reg(reg_isr, kw_read_reg(reg_isr)); |
| 456 | /* Arm timeout */ |
| 457 | host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; |
| 458 | add_timer(&host->timeout_timer); |
| 459 | /* Enable emission */ |
| 460 | kw_write_reg(reg_ier, KW_I2C_IRQ_MASK); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 461 | } |
| 462 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 463 | /* Start sending address */ |
| 464 | kw_write_reg(reg_control, KW_I2C_CTL_XADDR); |
| 465 | |
| 466 | /* Wait for completion */ |
| 467 | if (use_irq) |
| 468 | wait_for_completion(&host->complete); |
| 469 | else { |
| 470 | while(host->state != state_idle) { |
| 471 | unsigned long flags; |
| 472 | |
| 473 | u8 isr = kw_i2c_wait_interrupt(host); |
| 474 | spin_lock_irqsave(&host->lock, flags); |
| 475 | kw_i2c_handle_interrupt(host, isr); |
| 476 | spin_unlock_irqrestore(&host->lock, flags); |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | /* Disable emission */ |
| 481 | kw_write_reg(reg_ier, 0); |
| 482 | |
| 483 | return host->result; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 484 | } |
| 485 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 486 | static struct pmac_i2c_host_kw *__init kw_i2c_host_init(struct device_node *np) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 487 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 488 | struct pmac_i2c_host_kw *host; |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 489 | u32 *psteps, *prate, *addrp, steps; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 490 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 491 | host = kzalloc(sizeof(struct pmac_i2c_host_kw), GFP_KERNEL); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 492 | if (host == NULL) { |
| 493 | printk(KERN_ERR "low_i2c: Can't allocate host for %s\n", |
| 494 | np->full_name); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 495 | return NULL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 496 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 497 | |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 498 | /* Apple is kind enough to provide a valid AAPL,address property |
| 499 | * on all i2c keywest nodes so far ... we would have to fallback |
| 500 | * to macio parsing if that wasn't the case |
| 501 | */ |
| 502 | addrp = (u32 *)get_property(np, "AAPL,address", NULL); |
| 503 | if (addrp == NULL) { |
| 504 | printk(KERN_ERR "low_i2c: Can't find address for %s\n", |
| 505 | np->full_name); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 506 | kfree(host); |
| 507 | return NULL; |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 508 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 509 | init_MUTEX(&host->mutex); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 510 | init_completion(&host->complete); |
| 511 | spin_lock_init(&host->lock); |
| 512 | init_timer(&host->timeout_timer); |
| 513 | host->timeout_timer.function = kw_i2c_timeout; |
| 514 | host->timeout_timer.data = (unsigned long)host; |
| 515 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 516 | psteps = (u32 *)get_property(np, "AAPL,address-step", NULL); |
| 517 | steps = psteps ? (*psteps) : 0x10; |
| 518 | for (host->bsteps = 0; (steps & 0x01) == 0; host->bsteps++) |
| 519 | steps >>= 1; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 520 | /* Select interface rate */ |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 521 | host->speed = KW_I2C_MODE_25KHZ; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 522 | prate = (u32 *)get_property(np, "AAPL,i2c-rate", NULL); |
| 523 | if (prate) switch(*prate) { |
| 524 | case 100: |
| 525 | host->speed = KW_I2C_MODE_100KHZ; |
| 526 | break; |
| 527 | case 50: |
| 528 | host->speed = KW_I2C_MODE_50KHZ; |
| 529 | break; |
| 530 | case 25: |
| 531 | host->speed = KW_I2C_MODE_25KHZ; |
| 532 | break; |
| 533 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 534 | if (np->n_intrs > 0) |
| 535 | host->irq = np->intrs[0].line; |
| 536 | else |
| 537 | host->irq = NO_IRQ; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 538 | |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 539 | host->base = ioremap((*addrp), 0x1000); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 540 | if (host->base == NULL) { |
| 541 | printk(KERN_ERR "low_i2c: Can't map registers for %s\n", |
| 542 | np->full_name); |
| 543 | kfree(host); |
| 544 | return NULL; |
| 545 | } |
| 546 | |
| 547 | /* Make sure IRA is disabled */ |
| 548 | kw_write_reg(reg_ier, 0); |
| 549 | |
| 550 | /* Request chip interrupt */ |
| 551 | if (request_irq(host->irq, kw_i2c_irq, SA_SHIRQ, "keywest i2c", host)) |
| 552 | host->irq = NO_IRQ; |
| 553 | |
| 554 | printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %s\n", |
| 555 | *addrp, host->irq, np->full_name); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 556 | |
| 557 | return host; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 558 | } |
| 559 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 560 | |
| 561 | static void __init kw_i2c_add(struct pmac_i2c_host_kw *host, |
| 562 | struct device_node *controller, |
| 563 | struct device_node *busnode, |
| 564 | int channel) |
| 565 | { |
| 566 | struct pmac_i2c_bus *bus; |
| 567 | |
| 568 | bus = kzalloc(sizeof(struct pmac_i2c_bus), GFP_KERNEL); |
| 569 | if (bus == NULL) |
| 570 | return; |
| 571 | |
| 572 | bus->controller = of_node_get(controller); |
| 573 | bus->busnode = of_node_get(busnode); |
| 574 | bus->type = pmac_i2c_bus_keywest; |
| 575 | bus->hostdata = host; |
| 576 | bus->channel = channel; |
| 577 | bus->mode = pmac_i2c_mode_std; |
| 578 | bus->open = kw_i2c_open; |
| 579 | bus->close = kw_i2c_close; |
| 580 | bus->xfer = kw_i2c_xfer; |
| 581 | init_MUTEX(&bus->sem); |
| 582 | if (controller == busnode) |
| 583 | bus->flags = pmac_i2c_multibus; |
| 584 | list_add(&bus->link, &pmac_i2c_busses); |
| 585 | |
| 586 | printk(KERN_INFO " channel %d bus %s\n", channel, |
| 587 | (controller == busnode) ? "<multibus>" : busnode->full_name); |
| 588 | } |
| 589 | |
| 590 | static void __init kw_i2c_probe(void) |
| 591 | { |
| 592 | struct device_node *np, *child, *parent; |
| 593 | |
| 594 | /* Probe keywest-i2c busses */ |
| 595 | for (np = NULL; |
| 596 | (np = of_find_compatible_node(np, "i2c","keywest-i2c")) != NULL;){ |
| 597 | struct pmac_i2c_host_kw *host; |
| 598 | int multibus, chans, i; |
| 599 | |
| 600 | /* Found one, init a host structure */ |
| 601 | host = kw_i2c_host_init(np); |
| 602 | if (host == NULL) |
| 603 | continue; |
| 604 | |
| 605 | /* Now check if we have a multibus setup (old style) or if we |
| 606 | * have proper bus nodes. Note that the "new" way (proper bus |
| 607 | * nodes) might cause us to not create some busses that are |
| 608 | * kept hidden in the device-tree. In the future, we might |
| 609 | * want to work around that by creating busses without a node |
| 610 | * but not for now |
| 611 | */ |
| 612 | child = of_get_next_child(np, NULL); |
| 613 | multibus = !child || strcmp(child->name, "i2c-bus"); |
| 614 | of_node_put(child); |
| 615 | |
| 616 | /* For a multibus setup, we get the bus count based on the |
| 617 | * parent type |
| 618 | */ |
| 619 | if (multibus) { |
| 620 | parent = of_get_parent(np); |
| 621 | if (parent == NULL) |
| 622 | continue; |
| 623 | chans = parent->name[0] == 'u' ? 2 : 1; |
| 624 | for (i = 0; i < chans; i++) |
| 625 | kw_i2c_add(host, np, np, i); |
| 626 | } else { |
| 627 | for (child = NULL; |
| 628 | (child = of_get_next_child(np, child)) != NULL;) { |
| 629 | u32 *reg = |
| 630 | (u32 *)get_property(child, "reg", NULL); |
| 631 | if (reg == NULL) |
| 632 | continue; |
| 633 | kw_i2c_add(host, np, child, *reg); |
| 634 | } |
| 635 | } |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 640 | /* |
| 641 | * |
| 642 | * PMU implementation |
| 643 | * |
| 644 | */ |
| 645 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 646 | #ifdef CONFIG_ADB_PMU |
| 647 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 648 | /* |
| 649 | * i2c command block to the PMU |
| 650 | */ |
| 651 | struct pmu_i2c_hdr { |
| 652 | u8 bus; |
| 653 | u8 mode; |
| 654 | u8 bus2; |
| 655 | u8 address; |
| 656 | u8 sub_addr; |
| 657 | u8 comb_addr; |
| 658 | u8 count; |
| 659 | u8 data[]; |
| 660 | }; |
| 661 | |
| 662 | static void pmu_i2c_complete(struct adb_request *req) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 663 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 664 | complete(req->arg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 665 | } |
| 666 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 667 | static int pmu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 668 | u32 subaddr, u8 *data, int len) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 669 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 670 | struct adb_request *req = bus->hostdata; |
| 671 | struct pmu_i2c_hdr *hdr = (struct pmu_i2c_hdr *)&req->data[1]; |
| 672 | struct completion comp; |
| 673 | int read = addrdir & 1; |
| 674 | int retry; |
| 675 | int rc = 0; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 676 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 677 | /* For now, limit ourselves to 16 bytes transfers */ |
| 678 | if (len > 16) |
| 679 | return -EINVAL; |
| 680 | |
| 681 | init_completion(&comp); |
| 682 | |
| 683 | for (retry = 0; retry < 16; retry++) { |
| 684 | memset(req, 0, sizeof(struct adb_request)); |
| 685 | hdr->bus = bus->channel; |
| 686 | hdr->count = len; |
| 687 | |
| 688 | switch(bus->mode) { |
| 689 | case pmac_i2c_mode_std: |
| 690 | if (subsize != 0) |
| 691 | return -EINVAL; |
| 692 | hdr->address = addrdir; |
| 693 | hdr->mode = PMU_I2C_MODE_SIMPLE; |
| 694 | break; |
| 695 | case pmac_i2c_mode_stdsub: |
| 696 | case pmac_i2c_mode_combined: |
| 697 | if (subsize != 1) |
| 698 | return -EINVAL; |
| 699 | hdr->address = addrdir & 0xfe; |
| 700 | hdr->comb_addr = addrdir; |
| 701 | hdr->sub_addr = subaddr; |
| 702 | if (bus->mode == pmac_i2c_mode_stdsub) |
| 703 | hdr->mode = PMU_I2C_MODE_STDSUB; |
| 704 | else |
| 705 | hdr->mode = PMU_I2C_MODE_COMBINED; |
| 706 | break; |
| 707 | default: |
| 708 | return -EINVAL; |
| 709 | } |
| 710 | |
| 711 | INIT_COMPLETION(comp); |
| 712 | req->data[0] = PMU_I2C_CMD; |
| 713 | req->reply[0] = 0xff; |
| 714 | req->nbytes = sizeof(struct pmu_i2c_hdr) + 1; |
| 715 | req->done = pmu_i2c_complete; |
| 716 | req->arg = ∁ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 717 | if (!read && len) { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 718 | memcpy(hdr->data, data, len); |
| 719 | req->nbytes += len; |
| 720 | } |
| 721 | rc = pmu_queue_request(req); |
| 722 | if (rc) |
| 723 | return rc; |
| 724 | wait_for_completion(&comp); |
| 725 | if (req->reply[0] == PMU_I2C_STATUS_OK) |
| 726 | break; |
| 727 | msleep(15); |
| 728 | } |
| 729 | if (req->reply[0] != PMU_I2C_STATUS_OK) |
| 730 | return -EIO; |
| 731 | |
| 732 | for (retry = 0; retry < 16; retry++) { |
| 733 | memset(req, 0, sizeof(struct adb_request)); |
| 734 | |
| 735 | /* I know that looks like a lot, slow as hell, but darwin |
| 736 | * does it so let's be on the safe side for now |
| 737 | */ |
| 738 | msleep(15); |
| 739 | |
| 740 | hdr->bus = PMU_I2C_BUS_STATUS; |
| 741 | |
| 742 | INIT_COMPLETION(comp); |
| 743 | req->data[0] = PMU_I2C_CMD; |
| 744 | req->reply[0] = 0xff; |
| 745 | req->nbytes = 2; |
| 746 | req->done = pmu_i2c_complete; |
| 747 | req->arg = ∁ |
| 748 | rc = pmu_queue_request(req); |
| 749 | if (rc) |
| 750 | return rc; |
| 751 | wait_for_completion(&comp); |
| 752 | |
| 753 | if (req->reply[0] == PMU_I2C_STATUS_OK && !read) |
| 754 | return 0; |
| 755 | if (req->reply[0] == PMU_I2C_STATUS_DATAREAD && read) { |
| 756 | int rlen = req->reply_len - 1; |
| 757 | |
| 758 | if (rlen != len) { |
| 759 | printk(KERN_WARNING "low_i2c: PMU returned %d" |
| 760 | " bytes, expected %d !\n", rlen, len); |
| 761 | return -EIO; |
| 762 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 763 | if (len) |
| 764 | memcpy(data, &req->reply[1], len); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 765 | return 0; |
| 766 | } |
| 767 | } |
| 768 | return -EIO; |
| 769 | } |
| 770 | |
| 771 | static void __init pmu_i2c_probe(void) |
| 772 | { |
| 773 | struct pmac_i2c_bus *bus; |
| 774 | struct device_node *busnode; |
| 775 | int channel, sz; |
| 776 | |
| 777 | if (!pmu_present()) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 778 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 779 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 780 | /* There might or might not be a "pmu-i2c" node, we use that |
| 781 | * or via-pmu itself, whatever we find. I haven't seen a machine |
| 782 | * with separate bus nodes, so we assume a multibus setup |
| 783 | */ |
| 784 | busnode = of_find_node_by_name(NULL, "pmu-i2c"); |
| 785 | if (busnode == NULL) |
| 786 | busnode = of_find_node_by_name(NULL, "via-pmu"); |
| 787 | if (busnode == NULL) |
| 788 | return; |
| 789 | |
| 790 | printk(KERN_INFO "PMU i2c %s\n", busnode->full_name); |
| 791 | |
| 792 | /* |
| 793 | * We add bus 1 and 2 only for now, bus 0 is "special" |
| 794 | */ |
| 795 | for (channel = 1; channel <= 2; channel++) { |
| 796 | sz = sizeof(struct pmac_i2c_bus) + sizeof(struct adb_request); |
| 797 | bus = kzalloc(sz, GFP_KERNEL); |
| 798 | if (bus == NULL) |
| 799 | return; |
| 800 | |
| 801 | bus->controller = busnode; |
| 802 | bus->busnode = busnode; |
| 803 | bus->type = pmac_i2c_bus_pmu; |
| 804 | bus->channel = channel; |
| 805 | bus->mode = pmac_i2c_mode_std; |
| 806 | bus->hostdata = bus + 1; |
| 807 | bus->xfer = pmu_i2c_xfer; |
| 808 | init_MUTEX(&bus->sem); |
| 809 | bus->flags = pmac_i2c_multibus; |
| 810 | list_add(&bus->link, &pmac_i2c_busses); |
| 811 | |
| 812 | printk(KERN_INFO " channel %d bus <multibus>\n", channel); |
| 813 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | #endif /* CONFIG_ADB_PMU */ |
| 817 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 818 | |
| 819 | /* |
| 820 | * |
| 821 | * SMU implementation |
| 822 | * |
| 823 | */ |
| 824 | |
| 825 | #ifdef CONFIG_PMAC_SMU |
| 826 | |
| 827 | static void smu_i2c_complete(struct smu_i2c_cmd *cmd, void *misc) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 828 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 829 | complete(misc); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 830 | } |
| 831 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 832 | static int smu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 833 | u32 subaddr, u8 *data, int len) |
| 834 | { |
| 835 | struct smu_i2c_cmd *cmd = bus->hostdata; |
| 836 | struct completion comp; |
| 837 | int read = addrdir & 1; |
| 838 | int rc = 0; |
| 839 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 840 | if ((read && len > SMU_I2C_READ_MAX) || |
| 841 | ((!read) && len > SMU_I2C_WRITE_MAX)) |
| 842 | return -EINVAL; |
| 843 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 844 | memset(cmd, 0, sizeof(struct smu_i2c_cmd)); |
| 845 | cmd->info.bus = bus->channel; |
| 846 | cmd->info.devaddr = addrdir; |
| 847 | cmd->info.datalen = len; |
| 848 | |
| 849 | switch(bus->mode) { |
| 850 | case pmac_i2c_mode_std: |
| 851 | if (subsize != 0) |
| 852 | return -EINVAL; |
| 853 | cmd->info.type = SMU_I2C_TRANSFER_SIMPLE; |
| 854 | break; |
| 855 | case pmac_i2c_mode_stdsub: |
| 856 | case pmac_i2c_mode_combined: |
| 857 | if (subsize > 3 || subsize < 1) |
| 858 | return -EINVAL; |
| 859 | cmd->info.sublen = subsize; |
| 860 | /* that's big-endian only but heh ! */ |
| 861 | memcpy(&cmd->info.subaddr, ((char *)&subaddr) + (4 - subsize), |
| 862 | subsize); |
| 863 | if (bus->mode == pmac_i2c_mode_stdsub) |
| 864 | cmd->info.type = SMU_I2C_TRANSFER_STDSUB; |
| 865 | else |
| 866 | cmd->info.type = SMU_I2C_TRANSFER_COMBINED; |
| 867 | break; |
| 868 | default: |
| 869 | return -EINVAL; |
| 870 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 871 | if (!read && len) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 872 | memcpy(cmd->info.data, data, len); |
| 873 | |
| 874 | init_completion(&comp); |
| 875 | cmd->done = smu_i2c_complete; |
| 876 | cmd->misc = ∁ |
| 877 | rc = smu_queue_i2c(cmd); |
| 878 | if (rc < 0) |
| 879 | return rc; |
| 880 | wait_for_completion(&comp); |
| 881 | rc = cmd->status; |
| 882 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 883 | if (read && len) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 884 | memcpy(data, cmd->info.data, len); |
| 885 | return rc < 0 ? rc : 0; |
| 886 | } |
| 887 | |
| 888 | static void __init smu_i2c_probe(void) |
| 889 | { |
| 890 | struct device_node *controller, *busnode; |
| 891 | struct pmac_i2c_bus *bus; |
| 892 | u32 *reg; |
| 893 | int sz; |
| 894 | |
| 895 | if (!smu_present()) |
| 896 | return; |
| 897 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 898 | controller = of_find_node_by_name(NULL, "smu-i2c-control"); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 899 | if (controller == NULL) |
| 900 | controller = of_find_node_by_name(NULL, "smu"); |
| 901 | if (controller == NULL) |
| 902 | return; |
| 903 | |
| 904 | printk(KERN_INFO "SMU i2c %s\n", controller->full_name); |
| 905 | |
| 906 | /* Look for childs, note that they might not be of the right |
| 907 | * type as older device trees mix i2c busses and other thigns |
| 908 | * at the same level |
| 909 | */ |
| 910 | for (busnode = NULL; |
| 911 | (busnode = of_get_next_child(controller, busnode)) != NULL;) { |
| 912 | if (strcmp(busnode->type, "i2c") && |
| 913 | strcmp(busnode->type, "i2c-bus")) |
| 914 | continue; |
| 915 | reg = (u32 *)get_property(busnode, "reg", NULL); |
| 916 | if (reg == NULL) |
| 917 | continue; |
| 918 | |
| 919 | sz = sizeof(struct pmac_i2c_bus) + sizeof(struct smu_i2c_cmd); |
| 920 | bus = kzalloc(sz, GFP_KERNEL); |
| 921 | if (bus == NULL) |
| 922 | return; |
| 923 | |
| 924 | bus->controller = controller; |
| 925 | bus->busnode = of_node_get(busnode); |
| 926 | bus->type = pmac_i2c_bus_smu; |
| 927 | bus->channel = *reg; |
| 928 | bus->mode = pmac_i2c_mode_std; |
| 929 | bus->hostdata = bus + 1; |
| 930 | bus->xfer = smu_i2c_xfer; |
| 931 | init_MUTEX(&bus->sem); |
| 932 | bus->flags = 0; |
| 933 | list_add(&bus->link, &pmac_i2c_busses); |
| 934 | |
| 935 | printk(KERN_INFO " channel %x bus %s\n", |
| 936 | bus->channel, busnode->full_name); |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | #endif /* CONFIG_PMAC_SMU */ |
| 941 | |
| 942 | /* |
| 943 | * |
| 944 | * Core code |
| 945 | * |
| 946 | */ |
| 947 | |
| 948 | |
| 949 | struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node) |
| 950 | { |
| 951 | struct device_node *p = of_node_get(node); |
| 952 | struct device_node *prev = NULL; |
| 953 | struct pmac_i2c_bus *bus; |
| 954 | |
| 955 | while(p) { |
| 956 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 957 | if (p == bus->busnode) { |
| 958 | if (prev && bus->flags & pmac_i2c_multibus) { |
| 959 | u32 *reg; |
| 960 | reg = (u32 *)get_property(prev, "reg", |
| 961 | NULL); |
| 962 | if (!reg) |
| 963 | continue; |
| 964 | if (((*reg) >> 8) != bus->channel) |
| 965 | continue; |
| 966 | } |
| 967 | of_node_put(p); |
| 968 | of_node_put(prev); |
| 969 | return bus; |
| 970 | } |
| 971 | } |
| 972 | of_node_put(prev); |
| 973 | prev = p; |
| 974 | p = of_get_parent(p); |
| 975 | } |
| 976 | return NULL; |
| 977 | } |
| 978 | EXPORT_SYMBOL_GPL(pmac_i2c_find_bus); |
| 979 | |
| 980 | u8 pmac_i2c_get_dev_addr(struct device_node *device) |
| 981 | { |
| 982 | u32 *reg = (u32 *)get_property(device, "reg", NULL); |
| 983 | |
| 984 | if (reg == NULL) |
| 985 | return 0; |
| 986 | |
| 987 | return (*reg) & 0xff; |
| 988 | } |
| 989 | EXPORT_SYMBOL_GPL(pmac_i2c_get_dev_addr); |
| 990 | |
| 991 | struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus) |
| 992 | { |
| 993 | return bus->controller; |
| 994 | } |
| 995 | EXPORT_SYMBOL_GPL(pmac_i2c_get_controller); |
| 996 | |
| 997 | struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus) |
| 998 | { |
| 999 | return bus->busnode; |
| 1000 | } |
| 1001 | EXPORT_SYMBOL_GPL(pmac_i2c_get_bus_node); |
| 1002 | |
| 1003 | int pmac_i2c_get_type(struct pmac_i2c_bus *bus) |
| 1004 | { |
| 1005 | return bus->type; |
| 1006 | } |
| 1007 | EXPORT_SYMBOL_GPL(pmac_i2c_get_type); |
| 1008 | |
| 1009 | int pmac_i2c_get_flags(struct pmac_i2c_bus *bus) |
| 1010 | { |
| 1011 | return bus->flags; |
| 1012 | } |
| 1013 | EXPORT_SYMBOL_GPL(pmac_i2c_get_flags); |
| 1014 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1015 | int pmac_i2c_get_channel(struct pmac_i2c_bus *bus) |
| 1016 | { |
| 1017 | return bus->channel; |
| 1018 | } |
| 1019 | EXPORT_SYMBOL_GPL(pmac_i2c_get_channel); |
| 1020 | |
| 1021 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1022 | void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus, |
| 1023 | struct i2c_adapter *adapter) |
| 1024 | { |
| 1025 | WARN_ON(bus->adapter != NULL); |
| 1026 | bus->adapter = adapter; |
| 1027 | } |
| 1028 | EXPORT_SYMBOL_GPL(pmac_i2c_attach_adapter); |
| 1029 | |
| 1030 | void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus, |
| 1031 | struct i2c_adapter *adapter) |
| 1032 | { |
| 1033 | WARN_ON(bus->adapter != adapter); |
| 1034 | bus->adapter = NULL; |
| 1035 | } |
| 1036 | EXPORT_SYMBOL_GPL(pmac_i2c_detach_adapter); |
| 1037 | |
| 1038 | struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus) |
| 1039 | { |
| 1040 | return bus->adapter; |
| 1041 | } |
| 1042 | EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter); |
| 1043 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1044 | struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter) |
| 1045 | { |
| 1046 | struct pmac_i2c_bus *bus; |
| 1047 | |
| 1048 | list_for_each_entry(bus, &pmac_i2c_busses, link) |
| 1049 | if (bus->adapter == adapter) |
| 1050 | return bus; |
| 1051 | return NULL; |
| 1052 | } |
| 1053 | EXPORT_SYMBOL_GPL(pmac_i2c_adapter_to_bus); |
| 1054 | |
Al Viro | 1d0bd71 | 2006-02-01 07:25:14 -0500 | [diff] [blame] | 1055 | int pmac_i2c_match_adapter(struct device_node *dev, struct i2c_adapter *adapter) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1056 | { |
| 1057 | struct pmac_i2c_bus *bus = pmac_i2c_find_bus(dev); |
| 1058 | |
| 1059 | if (bus == NULL) |
| 1060 | return 0; |
| 1061 | return (bus->adapter == adapter); |
| 1062 | } |
| 1063 | EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter); |
| 1064 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1065 | int pmac_low_i2c_lock(struct device_node *np) |
| 1066 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1067 | struct pmac_i2c_bus *bus, *found = NULL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1068 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1069 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1070 | if (np == bus->controller) { |
| 1071 | found = bus; |
| 1072 | break; |
| 1073 | } |
| 1074 | } |
| 1075 | if (!found) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1076 | return -ENODEV; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1077 | return pmac_i2c_open(bus, 0); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1078 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1079 | EXPORT_SYMBOL_GPL(pmac_low_i2c_lock); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1080 | |
| 1081 | int pmac_low_i2c_unlock(struct device_node *np) |
| 1082 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1083 | struct pmac_i2c_bus *bus, *found = NULL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1084 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1085 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1086 | if (np == bus->controller) { |
| 1087 | found = bus; |
| 1088 | break; |
| 1089 | } |
| 1090 | } |
| 1091 | if (!found) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1092 | return -ENODEV; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1093 | pmac_i2c_close(bus); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1094 | return 0; |
| 1095 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1096 | EXPORT_SYMBOL_GPL(pmac_low_i2c_unlock); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1097 | |
| 1098 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1099 | int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1100 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1101 | int rc; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1102 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1103 | down(&bus->sem); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1104 | bus->polled = polled || pmac_i2c_force_poll; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1105 | bus->opened = 1; |
| 1106 | bus->mode = pmac_i2c_mode_std; |
| 1107 | if (bus->open && (rc = bus->open(bus)) != 0) { |
| 1108 | bus->opened = 0; |
| 1109 | up(&bus->sem); |
| 1110 | return rc; |
| 1111 | } |
| 1112 | return 0; |
| 1113 | } |
| 1114 | EXPORT_SYMBOL_GPL(pmac_i2c_open); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1115 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1116 | void pmac_i2c_close(struct pmac_i2c_bus *bus) |
| 1117 | { |
| 1118 | WARN_ON(!bus->opened); |
| 1119 | if (bus->close) |
| 1120 | bus->close(bus); |
| 1121 | bus->opened = 0; |
| 1122 | up(&bus->sem); |
| 1123 | } |
| 1124 | EXPORT_SYMBOL_GPL(pmac_i2c_close); |
| 1125 | |
| 1126 | int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode) |
| 1127 | { |
| 1128 | WARN_ON(!bus->opened); |
| 1129 | |
| 1130 | /* Report me if you see the error below as there might be a new |
| 1131 | * "combined4" mode that I need to implement for the SMU bus |
| 1132 | */ |
| 1133 | if (mode < pmac_i2c_mode_dumb || mode > pmac_i2c_mode_combined) { |
| 1134 | printk(KERN_ERR "low_i2c: Invalid mode %d requested on" |
| 1135 | " bus %s !\n", mode, bus->busnode->full_name); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1136 | return -EINVAL; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1137 | } |
| 1138 | bus->mode = mode; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1139 | |
| 1140 | return 0; |
| 1141 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1142 | EXPORT_SYMBOL_GPL(pmac_i2c_setmode); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1143 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1144 | int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 1145 | u32 subaddr, u8 *data, int len) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1146 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1147 | int rc; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1148 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1149 | WARN_ON(!bus->opened); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1150 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1151 | DBG("xfer() chan=%d, addrdir=0x%x, mode=%d, subsize=%d, subaddr=0x%x," |
| 1152 | " %d bytes, bus %s\n", bus->channel, addrdir, bus->mode, subsize, |
| 1153 | subaddr, len, bus->busnode->full_name); |
| 1154 | |
| 1155 | rc = bus->xfer(bus, addrdir, subsize, subaddr, data, len); |
| 1156 | |
| 1157 | #ifdef DEBUG |
| 1158 | if (rc) |
| 1159 | DBG("xfer error %d\n", rc); |
| 1160 | #endif |
| 1161 | return rc; |
| 1162 | } |
| 1163 | EXPORT_SYMBOL_GPL(pmac_i2c_xfer); |
| 1164 | |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1165 | /* some quirks for platform function decoding */ |
| 1166 | enum { |
| 1167 | pmac_i2c_quirk_invmask = 0x00000001u, |
| 1168 | }; |
| 1169 | |
| 1170 | static void pmac_i2c_devscan(void (*callback)(struct device_node *dev, |
| 1171 | int quirks)) |
| 1172 | { |
| 1173 | struct pmac_i2c_bus *bus; |
| 1174 | struct device_node *np; |
| 1175 | static struct whitelist_ent { |
| 1176 | char *name; |
| 1177 | char *compatible; |
| 1178 | int quirks; |
| 1179 | } whitelist[] = { |
| 1180 | /* XXX Study device-tree's & apple drivers are get the quirks |
| 1181 | * right ! |
| 1182 | */ |
| 1183 | { "i2c-hwclock", NULL, pmac_i2c_quirk_invmask }, |
| 1184 | { "i2c-cpu-voltage", NULL, 0}, |
| 1185 | { "temp-monitor", NULL, 0 }, |
| 1186 | { "supply-monitor", NULL, 0 }, |
| 1187 | { NULL, NULL, 0 }, |
| 1188 | }; |
| 1189 | |
| 1190 | /* Only some devices need to have platform functions instanciated |
| 1191 | * here. For now, we have a table. Others, like 9554 i2c GPIOs used |
| 1192 | * on Xserve, if we ever do a driver for them, will use their own |
| 1193 | * platform function instance |
| 1194 | */ |
| 1195 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1196 | for (np = NULL; |
| 1197 | (np = of_get_next_child(bus->busnode, np)) != NULL;) { |
| 1198 | struct whitelist_ent *p; |
| 1199 | /* If multibus, check if device is on that bus */ |
| 1200 | if (bus->flags & pmac_i2c_multibus) |
| 1201 | if (bus != pmac_i2c_find_bus(np)) |
| 1202 | continue; |
| 1203 | for (p = whitelist; p->name != NULL; p++) { |
| 1204 | if (strcmp(np->name, p->name)) |
| 1205 | continue; |
| 1206 | if (p->compatible && |
| 1207 | !device_is_compatible(np, p->compatible)) |
| 1208 | continue; |
| 1209 | callback(np, p->quirks); |
| 1210 | break; |
| 1211 | } |
| 1212 | } |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | #define MAX_I2C_DATA 64 |
| 1217 | |
| 1218 | struct pmac_i2c_pf_inst |
| 1219 | { |
| 1220 | struct pmac_i2c_bus *bus; |
| 1221 | u8 addr; |
| 1222 | u8 buffer[MAX_I2C_DATA]; |
| 1223 | u8 scratch[MAX_I2C_DATA]; |
| 1224 | int bytes; |
| 1225 | int quirks; |
| 1226 | }; |
| 1227 | |
| 1228 | static void* pmac_i2c_do_begin(struct pmf_function *func, struct pmf_args *args) |
| 1229 | { |
| 1230 | struct pmac_i2c_pf_inst *inst; |
| 1231 | struct pmac_i2c_bus *bus; |
| 1232 | |
| 1233 | bus = pmac_i2c_find_bus(func->node); |
| 1234 | if (bus == NULL) { |
| 1235 | printk(KERN_ERR "low_i2c: Can't find bus for %s (pfunc)\n", |
| 1236 | func->node->full_name); |
| 1237 | return NULL; |
| 1238 | } |
| 1239 | if (pmac_i2c_open(bus, 0)) { |
| 1240 | printk(KERN_ERR "low_i2c: Can't open i2c bus for %s (pfunc)\n", |
| 1241 | func->node->full_name); |
| 1242 | return NULL; |
| 1243 | } |
| 1244 | |
| 1245 | /* XXX might need GFP_ATOMIC when called during the suspend process, |
| 1246 | * but then, there are already lots of issues with suspending when |
| 1247 | * near OOM that need to be resolved, the allocator itself should |
| 1248 | * probably make GFP_NOIO implicit during suspend |
| 1249 | */ |
| 1250 | inst = kzalloc(sizeof(struct pmac_i2c_pf_inst), GFP_KERNEL); |
| 1251 | if (inst == NULL) { |
| 1252 | pmac_i2c_close(bus); |
| 1253 | return NULL; |
| 1254 | } |
| 1255 | inst->bus = bus; |
| 1256 | inst->addr = pmac_i2c_get_dev_addr(func->node); |
| 1257 | inst->quirks = (int)(long)func->driver_data; |
| 1258 | return inst; |
| 1259 | } |
| 1260 | |
| 1261 | static void pmac_i2c_do_end(struct pmf_function *func, void *instdata) |
| 1262 | { |
| 1263 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1264 | |
| 1265 | if (inst == NULL) |
| 1266 | return; |
| 1267 | pmac_i2c_close(inst->bus); |
| 1268 | if (inst) |
| 1269 | kfree(inst); |
| 1270 | } |
| 1271 | |
| 1272 | static int pmac_i2c_do_read(PMF_STD_ARGS, u32 len) |
| 1273 | { |
| 1274 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1275 | |
| 1276 | inst->bytes = len; |
| 1277 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 0, 0, |
| 1278 | inst->buffer, len); |
| 1279 | } |
| 1280 | |
| 1281 | static int pmac_i2c_do_write(PMF_STD_ARGS, u32 len, const u8 *data) |
| 1282 | { |
| 1283 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1284 | |
| 1285 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0, |
| 1286 | (u8 *)data, len); |
| 1287 | } |
| 1288 | |
| 1289 | /* This function is used to do the masking & OR'ing for the "rmw" type |
| 1290 | * callbacks. Ze should apply the mask and OR in the values in the |
| 1291 | * buffer before writing back. The problem is that it seems that |
| 1292 | * various darwin drivers implement the mask/or differently, thus |
| 1293 | * we need to check the quirks first |
| 1294 | */ |
| 1295 | static void pmac_i2c_do_apply_rmw(struct pmac_i2c_pf_inst *inst, |
| 1296 | u32 len, const u8 *mask, const u8 *val) |
| 1297 | { |
| 1298 | int i; |
| 1299 | |
| 1300 | if (inst->quirks & pmac_i2c_quirk_invmask) { |
| 1301 | for (i = 0; i < len; i ++) |
| 1302 | inst->scratch[i] = (inst->buffer[i] & mask[i]) | val[i]; |
| 1303 | } else { |
| 1304 | for (i = 0; i < len; i ++) |
| 1305 | inst->scratch[i] = (inst->buffer[i] & ~mask[i]) |
| 1306 | | (val[i] & mask[i]); |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | static int pmac_i2c_do_rmw(PMF_STD_ARGS, u32 masklen, u32 valuelen, |
| 1311 | u32 totallen, const u8 *maskdata, |
| 1312 | const u8 *valuedata) |
| 1313 | { |
| 1314 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1315 | |
| 1316 | if (masklen > inst->bytes || valuelen > inst->bytes || |
| 1317 | totallen > inst->bytes || valuelen > masklen) |
| 1318 | return -EINVAL; |
| 1319 | |
| 1320 | pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata); |
| 1321 | |
| 1322 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0, |
| 1323 | inst->scratch, totallen); |
| 1324 | } |
| 1325 | |
| 1326 | static int pmac_i2c_do_read_sub(PMF_STD_ARGS, u8 subaddr, u32 len) |
| 1327 | { |
| 1328 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1329 | |
| 1330 | inst->bytes = len; |
| 1331 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 1, subaddr, |
| 1332 | inst->buffer, len); |
| 1333 | } |
| 1334 | |
| 1335 | static int pmac_i2c_do_write_sub(PMF_STD_ARGS, u8 subaddr, u32 len, |
| 1336 | const u8 *data) |
| 1337 | { |
| 1338 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1339 | |
| 1340 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1, |
| 1341 | subaddr, (u8 *)data, len); |
| 1342 | } |
| 1343 | |
| 1344 | static int pmac_i2c_do_set_mode(PMF_STD_ARGS, int mode) |
| 1345 | { |
| 1346 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1347 | |
| 1348 | return pmac_i2c_setmode(inst->bus, mode); |
| 1349 | } |
| 1350 | |
| 1351 | static int pmac_i2c_do_rmw_sub(PMF_STD_ARGS, u8 subaddr, u32 masklen, |
| 1352 | u32 valuelen, u32 totallen, const u8 *maskdata, |
| 1353 | const u8 *valuedata) |
| 1354 | { |
| 1355 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1356 | |
| 1357 | if (masklen > inst->bytes || valuelen > inst->bytes || |
| 1358 | totallen > inst->bytes || valuelen > masklen) |
| 1359 | return -EINVAL; |
| 1360 | |
| 1361 | pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata); |
| 1362 | |
| 1363 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1, |
| 1364 | subaddr, inst->scratch, totallen); |
| 1365 | } |
| 1366 | |
| 1367 | static int pmac_i2c_do_mask_and_comp(PMF_STD_ARGS, u32 len, |
| 1368 | const u8 *maskdata, |
| 1369 | const u8 *valuedata) |
| 1370 | { |
| 1371 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1372 | int i, match; |
| 1373 | |
| 1374 | /* Get return value pointer, it's assumed to be a u32 */ |
| 1375 | if (!args || !args->count || !args->u[0].p) |
| 1376 | return -EINVAL; |
| 1377 | |
| 1378 | /* Check buffer */ |
| 1379 | if (len > inst->bytes) |
| 1380 | return -EINVAL; |
| 1381 | |
| 1382 | for (i = 0, match = 1; match && i < len; i ++) |
| 1383 | if ((inst->buffer[i] & maskdata[i]) != valuedata[i]) |
| 1384 | match = 0; |
| 1385 | *args->u[0].p = match; |
| 1386 | return 0; |
| 1387 | } |
| 1388 | |
| 1389 | static int pmac_i2c_do_delay(PMF_STD_ARGS, u32 duration) |
| 1390 | { |
| 1391 | msleep((duration + 999) / 1000); |
| 1392 | return 0; |
| 1393 | } |
| 1394 | |
| 1395 | |
| 1396 | static struct pmf_handlers pmac_i2c_pfunc_handlers = { |
| 1397 | .begin = pmac_i2c_do_begin, |
| 1398 | .end = pmac_i2c_do_end, |
| 1399 | .read_i2c = pmac_i2c_do_read, |
| 1400 | .write_i2c = pmac_i2c_do_write, |
| 1401 | .rmw_i2c = pmac_i2c_do_rmw, |
| 1402 | .read_i2c_sub = pmac_i2c_do_read_sub, |
| 1403 | .write_i2c_sub = pmac_i2c_do_write_sub, |
| 1404 | .rmw_i2c_sub = pmac_i2c_do_rmw_sub, |
| 1405 | .set_i2c_mode = pmac_i2c_do_set_mode, |
| 1406 | .mask_and_compare = pmac_i2c_do_mask_and_comp, |
| 1407 | .delay = pmac_i2c_do_delay, |
| 1408 | }; |
| 1409 | |
| 1410 | static void __init pmac_i2c_dev_create(struct device_node *np, int quirks) |
| 1411 | { |
| 1412 | DBG("dev_create(%s)\n", np->full_name); |
| 1413 | |
| 1414 | pmf_register_driver(np, &pmac_i2c_pfunc_handlers, |
| 1415 | (void *)(long)quirks); |
| 1416 | } |
| 1417 | |
| 1418 | static void __init pmac_i2c_dev_init(struct device_node *np, int quirks) |
| 1419 | { |
| 1420 | DBG("dev_create(%s)\n", np->full_name); |
| 1421 | |
| 1422 | pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_INIT, NULL); |
| 1423 | } |
| 1424 | |
| 1425 | static void pmac_i2c_dev_suspend(struct device_node *np, int quirks) |
| 1426 | { |
| 1427 | DBG("dev_suspend(%s)\n", np->full_name); |
| 1428 | pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_SLEEP, NULL); |
| 1429 | } |
| 1430 | |
| 1431 | static void pmac_i2c_dev_resume(struct device_node *np, int quirks) |
| 1432 | { |
| 1433 | DBG("dev_resume(%s)\n", np->full_name); |
| 1434 | pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_WAKE, NULL); |
| 1435 | } |
| 1436 | |
| 1437 | void pmac_pfunc_i2c_suspend(void) |
| 1438 | { |
| 1439 | pmac_i2c_devscan(pmac_i2c_dev_suspend); |
| 1440 | } |
| 1441 | |
| 1442 | void pmac_pfunc_i2c_resume(void) |
| 1443 | { |
| 1444 | pmac_i2c_devscan(pmac_i2c_dev_resume); |
| 1445 | } |
| 1446 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1447 | /* |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1448 | * Initialize us: probe all i2c busses on the machine, instantiate |
| 1449 | * busses and platform functions as needed. |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1450 | */ |
| 1451 | /* This is non-static as it might be called early by smp code */ |
| 1452 | int __init pmac_i2c_init(void) |
| 1453 | { |
| 1454 | static int i2c_inited; |
| 1455 | |
| 1456 | if (i2c_inited) |
| 1457 | return 0; |
| 1458 | i2c_inited = 1; |
| 1459 | |
Benjamin Herrenschmidt | e822250 | 2006-03-28 23:15:54 +1100 | [diff] [blame] | 1460 | if (!machine_is(powermac)) |
| 1461 | return 0; |
| 1462 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1463 | /* Probe keywest-i2c busses */ |
| 1464 | kw_i2c_probe(); |
| 1465 | |
| 1466 | #ifdef CONFIG_ADB_PMU |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1467 | /* Probe PMU i2c busses */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1468 | pmu_i2c_probe(); |
| 1469 | #endif |
| 1470 | |
| 1471 | #ifdef CONFIG_PMAC_SMU |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1472 | /* Probe SMU i2c busses */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1473 | smu_i2c_probe(); |
| 1474 | #endif |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1475 | |
| 1476 | /* Now add plaform functions for some known devices */ |
| 1477 | pmac_i2c_devscan(pmac_i2c_dev_create); |
| 1478 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1479 | return 0; |
| 1480 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1481 | arch_initcall(pmac_i2c_init); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1482 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1483 | /* Since pmac_i2c_init can be called too early for the platform device |
| 1484 | * registration, we need to do it at a later time. In our case, subsys |
| 1485 | * happens to fit well, though I agree it's a bit of a hack... |
| 1486 | */ |
| 1487 | static int __init pmac_i2c_create_platform_devices(void) |
| 1488 | { |
| 1489 | struct pmac_i2c_bus *bus; |
| 1490 | int i = 0; |
| 1491 | |
| 1492 | /* In the case where we are initialized from smp_init(), we must |
| 1493 | * not use the timer (and thus the irq). It's safe from now on |
| 1494 | * though |
| 1495 | */ |
| 1496 | pmac_i2c_force_poll = 0; |
| 1497 | |
| 1498 | /* Create platform devices */ |
| 1499 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1500 | bus->platform_dev = |
| 1501 | platform_device_alloc("i2c-powermac", i++); |
| 1502 | if (bus->platform_dev == NULL) |
| 1503 | return -ENOMEM; |
| 1504 | bus->platform_dev->dev.platform_data = bus; |
| 1505 | platform_device_add(bus->platform_dev); |
| 1506 | } |
| 1507 | |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1508 | /* Now call platform "init" functions */ |
| 1509 | pmac_i2c_devscan(pmac_i2c_dev_init); |
| 1510 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1511 | return 0; |
| 1512 | } |
| 1513 | subsys_initcall(pmac_i2c_create_platform_devices); |