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 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 33 | #include <linux/types.h> |
| 34 | #include <linux/sched.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/adb.h> |
| 38 | #include <linux/pmu.h> |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 39 | #include <linux/delay.h> |
| 40 | #include <linux/completion.h> |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 41 | #include <linux/platform_device.h> |
| 42 | #include <linux/interrupt.h> |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 43 | #include <linux/timer.h> |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 44 | #include <linux/mutex.h> |
Jean Delvare | 6dfa5ca | 2009-12-06 17:06:19 +0100 | [diff] [blame] | 45 | #include <linux/i2c.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 46 | #include <linux/slab.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 47 | #include <asm/keylargo.h> |
| 48 | #include <asm/uninorth.h> |
| 49 | #include <asm/io.h> |
| 50 | #include <asm/prom.h> |
| 51 | #include <asm/machdep.h> |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 52 | #include <asm/smu.h> |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 53 | #include <asm/pmac_pfunc.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 54 | #include <asm/pmac_low_i2c.h> |
| 55 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 56 | #ifdef DEBUG |
| 57 | #define DBG(x...) do {\ |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 58 | printk(KERN_DEBUG "low_i2c:" x); \ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 59 | } while(0) |
| 60 | #else |
| 61 | #define DBG(x...) |
| 62 | #endif |
| 63 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 64 | #ifdef DEBUG_LOW |
| 65 | #define DBG_LOW(x...) do {\ |
| 66 | printk(KERN_DEBUG "low_i2c:" x); \ |
| 67 | } while(0) |
| 68 | #else |
| 69 | #define DBG_LOW(x...) |
| 70 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 71 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 72 | |
| 73 | static int pmac_i2c_force_poll = 1; |
| 74 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 75 | /* |
| 76 | * A bus structure. Each bus in the system has such a structure associated. |
| 77 | */ |
| 78 | struct pmac_i2c_bus |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 79 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 80 | struct list_head link; |
| 81 | struct device_node *controller; |
| 82 | struct device_node *busnode; |
| 83 | int type; |
| 84 | int flags; |
Jean Delvare | 6dfa5ca | 2009-12-06 17:06:19 +0100 | [diff] [blame] | 85 | struct i2c_adapter adapter; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 86 | void *hostdata; |
| 87 | int channel; /* some hosts have multiple */ |
| 88 | int mode; /* current mode */ |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 89 | struct mutex mutex; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 90 | int opened; |
| 91 | int polled; /* open mode */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 92 | struct platform_device *platform_dev; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 93 | |
| 94 | /* ops */ |
| 95 | int (*open)(struct pmac_i2c_bus *bus); |
| 96 | void (*close)(struct pmac_i2c_bus *bus); |
| 97 | int (*xfer)(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 98 | u32 subaddr, u8 *data, int len); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 99 | }; |
| 100 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 101 | static LIST_HEAD(pmac_i2c_busses); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 102 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 103 | /* |
| 104 | * Keywest implementation |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 105 | */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 106 | |
| 107 | struct pmac_i2c_host_kw |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 108 | { |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 109 | struct mutex mutex; /* Access mutex for use by |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 110 | * i2c-keywest */ |
| 111 | void __iomem *base; /* register base address */ |
| 112 | int bsteps; /* register stepping */ |
| 113 | int speed; /* speed */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 114 | int irq; |
| 115 | u8 *data; |
| 116 | unsigned len; |
| 117 | int state; |
| 118 | int rw; |
| 119 | int polled; |
| 120 | int result; |
| 121 | struct completion complete; |
| 122 | spinlock_t lock; |
| 123 | struct timer_list timeout_timer; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 124 | }; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 125 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 126 | /* Register indices */ |
| 127 | typedef enum { |
| 128 | reg_mode = 0, |
| 129 | reg_control, |
| 130 | reg_status, |
| 131 | reg_isr, |
| 132 | reg_ier, |
| 133 | reg_addr, |
| 134 | reg_subaddr, |
| 135 | reg_data |
| 136 | } reg_t; |
| 137 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 138 | /* The Tumbler audio equalizer can be really slow sometimes */ |
| 139 | #define KW_POLL_TIMEOUT (2*HZ) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 140 | |
| 141 | /* Mode register */ |
| 142 | #define KW_I2C_MODE_100KHZ 0x00 |
| 143 | #define KW_I2C_MODE_50KHZ 0x01 |
| 144 | #define KW_I2C_MODE_25KHZ 0x02 |
| 145 | #define KW_I2C_MODE_DUMB 0x00 |
| 146 | #define KW_I2C_MODE_STANDARD 0x04 |
| 147 | #define KW_I2C_MODE_STANDARDSUB 0x08 |
| 148 | #define KW_I2C_MODE_COMBINED 0x0C |
| 149 | #define KW_I2C_MODE_MODE_MASK 0x0C |
| 150 | #define KW_I2C_MODE_CHAN_MASK 0xF0 |
| 151 | |
| 152 | /* Control register */ |
| 153 | #define KW_I2C_CTL_AAK 0x01 |
| 154 | #define KW_I2C_CTL_XADDR 0x02 |
| 155 | #define KW_I2C_CTL_STOP 0x04 |
| 156 | #define KW_I2C_CTL_START 0x08 |
| 157 | |
| 158 | /* Status register */ |
| 159 | #define KW_I2C_STAT_BUSY 0x01 |
| 160 | #define KW_I2C_STAT_LAST_AAK 0x02 |
| 161 | #define KW_I2C_STAT_LAST_RW 0x04 |
| 162 | #define KW_I2C_STAT_SDA 0x08 |
| 163 | #define KW_I2C_STAT_SCL 0x10 |
| 164 | |
| 165 | /* IER & ISR registers */ |
| 166 | #define KW_I2C_IRQ_DATA 0x01 |
| 167 | #define KW_I2C_IRQ_ADDR 0x02 |
| 168 | #define KW_I2C_IRQ_STOP 0x04 |
| 169 | #define KW_I2C_IRQ_START 0x08 |
| 170 | #define KW_I2C_IRQ_MASK 0x0F |
| 171 | |
| 172 | /* State machine states */ |
| 173 | enum { |
| 174 | state_idle, |
| 175 | state_addr, |
| 176 | state_read, |
| 177 | state_write, |
| 178 | state_stop, |
| 179 | state_dead |
| 180 | }; |
| 181 | |
| 182 | #define WRONG_STATE(name) do {\ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 183 | printk(KERN_DEBUG "KW: wrong state. Got %s, state: %s " \ |
| 184 | "(isr: %02x)\n", \ |
| 185 | name, __kw_state_names[host->state], isr); \ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 186 | } while(0) |
| 187 | |
| 188 | static const char *__kw_state_names[] = { |
| 189 | "state_idle", |
| 190 | "state_addr", |
| 191 | "state_read", |
| 192 | "state_write", |
| 193 | "state_stop", |
| 194 | "state_dead" |
| 195 | }; |
| 196 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 197 | 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] | 198 | { |
| 199 | return readb(host->base + (((unsigned int)reg) << host->bsteps)); |
| 200 | } |
| 201 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 202 | static inline void __kw_write_reg(struct pmac_i2c_host_kw *host, |
| 203 | reg_t reg, u8 val) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 204 | { |
| 205 | writeb(val, host->base + (((unsigned)reg) << host->bsteps)); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 206 | (void)__kw_read_reg(host, reg_subaddr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 207 | } |
| 208 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 209 | #define kw_write_reg(reg, val) __kw_write_reg(host, reg, val) |
| 210 | #define kw_read_reg(reg) __kw_read_reg(host, reg) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 211 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 212 | static u8 kw_i2c_wait_interrupt(struct pmac_i2c_host_kw *host) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 213 | { |
| 214 | int i, j; |
| 215 | u8 isr; |
| 216 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 217 | for (i = 0; i < 1000; i++) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 218 | isr = kw_read_reg(reg_isr) & KW_I2C_IRQ_MASK; |
| 219 | if (isr != 0) |
| 220 | return isr; |
| 221 | |
| 222 | /* This code is used with the timebase frozen, we cannot rely |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 223 | * on udelay nor schedule when in polled mode ! |
| 224 | * For now, just use a bogus loop.... |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 225 | */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 226 | if (host->polled) { |
| 227 | for (j = 1; j < 100000; j++) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 228 | mb(); |
| 229 | } else |
| 230 | msleep(1); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 231 | } |
| 232 | return isr; |
| 233 | } |
| 234 | |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 235 | static void kw_i2c_do_stop(struct pmac_i2c_host_kw *host, int result) |
| 236 | { |
| 237 | kw_write_reg(reg_control, KW_I2C_CTL_STOP); |
| 238 | host->state = state_stop; |
| 239 | host->result = result; |
| 240 | } |
| 241 | |
| 242 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 243 | 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] | 244 | { |
| 245 | u8 ack; |
| 246 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 247 | DBG_LOW("kw_handle_interrupt(%s, isr: %x)\n", |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 248 | __kw_state_names[host->state], isr); |
| 249 | |
| 250 | if (host->state == state_idle) { |
| 251 | printk(KERN_WARNING "low_i2c: Keywest got an out of state" |
| 252 | " interrupt, ignoring\n"); |
| 253 | kw_write_reg(reg_isr, isr); |
| 254 | return; |
| 255 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 256 | |
| 257 | if (isr == 0) { |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 258 | printk(KERN_WARNING "low_i2c: Timeout in i2c transfer" |
| 259 | " on keywest !\n"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 260 | if (host->state != state_stop) { |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 261 | kw_i2c_do_stop(host, -EIO); |
| 262 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 263 | } |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 264 | ack = kw_read_reg(reg_status); |
| 265 | if (ack & KW_I2C_STAT_BUSY) |
| 266 | kw_write_reg(reg_status, 0); |
| 267 | host->state = state_idle; |
| 268 | kw_write_reg(reg_ier, 0x00); |
| 269 | if (!host->polled) |
| 270 | complete(&host->complete); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 271 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | if (isr & KW_I2C_IRQ_ADDR) { |
| 275 | ack = kw_read_reg(reg_status); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 276 | if (host->state != state_addr) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 277 | WRONG_STATE("KW_I2C_IRQ_ADDR"); |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 278 | kw_i2c_do_stop(host, -EIO); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 279 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 280 | if ((ack & KW_I2C_STAT_LAST_AAK) == 0) { |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 281 | host->result = -ENXIO; |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 282 | host->state = state_stop; |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 283 | DBG_LOW("KW: NAK on address\n"); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 284 | } else { |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 285 | if (host->len == 0) |
| 286 | kw_i2c_do_stop(host, 0); |
| 287 | else if (host->rw) { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 288 | host->state = state_read; |
| 289 | if (host->len > 1) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 290 | kw_write_reg(reg_control, |
| 291 | KW_I2C_CTL_AAK); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 292 | } else { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 293 | host->state = state_write; |
| 294 | kw_write_reg(reg_data, *(host->data++)); |
| 295 | host->len--; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 296 | } |
| 297 | } |
| 298 | kw_write_reg(reg_isr, KW_I2C_IRQ_ADDR); |
| 299 | } |
| 300 | |
| 301 | if (isr & KW_I2C_IRQ_DATA) { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 302 | if (host->state == state_read) { |
| 303 | *(host->data++) = kw_read_reg(reg_data); |
| 304 | host->len--; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 305 | kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 306 | if (host->len == 0) |
| 307 | host->state = state_stop; |
| 308 | else if (host->len == 1) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 309 | kw_write_reg(reg_control, 0); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 310 | } else if (host->state == state_write) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 311 | ack = kw_read_reg(reg_status); |
| 312 | if ((ack & KW_I2C_STAT_LAST_AAK) == 0) { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 313 | DBG_LOW("KW: nack on data write\n"); |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 314 | host->result = -EFBIG; |
| 315 | host->state = state_stop; |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 316 | } else if (host->len) { |
| 317 | kw_write_reg(reg_data, *(host->data++)); |
| 318 | host->len--; |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 319 | } else |
| 320 | kw_i2c_do_stop(host, 0); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 321 | } else { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 322 | WRONG_STATE("KW_I2C_IRQ_DATA"); |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 323 | if (host->state != state_stop) |
| 324 | kw_i2c_do_stop(host, -EIO); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 325 | } |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 326 | kw_write_reg(reg_isr, KW_I2C_IRQ_DATA); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | if (isr & KW_I2C_IRQ_STOP) { |
| 330 | kw_write_reg(reg_isr, KW_I2C_IRQ_STOP); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 331 | if (host->state != state_stop) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 332 | WRONG_STATE("KW_I2C_IRQ_STOP"); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 333 | host->result = -EIO; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 334 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 335 | host->state = state_idle; |
| 336 | if (!host->polled) |
| 337 | complete(&host->complete); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 338 | } |
| 339 | |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 340 | /* Below should only happen in manual mode which we don't use ... */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 341 | if (isr & KW_I2C_IRQ_START) |
| 342 | kw_write_reg(reg_isr, KW_I2C_IRQ_START); |
| 343 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | /* Interrupt handler */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 347 | static irqreturn_t kw_i2c_irq(int irq, void *dev_id) |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 348 | { |
| 349 | struct pmac_i2c_host_kw *host = dev_id; |
| 350 | unsigned long flags; |
| 351 | |
| 352 | spin_lock_irqsave(&host->lock, flags); |
| 353 | del_timer(&host->timeout_timer); |
| 354 | kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr)); |
| 355 | if (host->state != state_idle) { |
| 356 | host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; |
| 357 | add_timer(&host->timeout_timer); |
| 358 | } |
| 359 | spin_unlock_irqrestore(&host->lock, flags); |
| 360 | return IRQ_HANDLED; |
| 361 | } |
| 362 | |
| 363 | static void kw_i2c_timeout(unsigned long data) |
| 364 | { |
| 365 | struct pmac_i2c_host_kw *host = (struct pmac_i2c_host_kw *)data; |
| 366 | unsigned long flags; |
| 367 | |
| 368 | spin_lock_irqsave(&host->lock, flags); |
| 369 | kw_i2c_handle_interrupt(host, kw_read_reg(reg_isr)); |
| 370 | if (host->state != state_idle) { |
| 371 | host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; |
| 372 | add_timer(&host->timeout_timer); |
| 373 | } |
| 374 | spin_unlock_irqrestore(&host->lock, flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 375 | } |
| 376 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 377 | static int kw_i2c_open(struct pmac_i2c_bus *bus) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 378 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 379 | struct pmac_i2c_host_kw *host = bus->hostdata; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 380 | mutex_lock(&host->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static void kw_i2c_close(struct pmac_i2c_bus *bus) |
| 385 | { |
| 386 | struct pmac_i2c_host_kw *host = bus->hostdata; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 387 | mutex_unlock(&host->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | static int kw_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 391 | u32 subaddr, u8 *data, int len) |
| 392 | { |
| 393 | struct pmac_i2c_host_kw *host = bus->hostdata; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 394 | u8 mode_reg = host->speed; |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 395 | int use_irq = host->irq != NO_IRQ && !bus->polled; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 396 | |
| 397 | /* Setup mode & subaddress if any */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 398 | switch(bus->mode) { |
| 399 | case pmac_i2c_mode_dumb: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 400 | return -EINVAL; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 401 | case pmac_i2c_mode_std: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 402 | mode_reg |= KW_I2C_MODE_STANDARD; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 403 | if (subsize != 0) |
| 404 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 405 | break; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 406 | case pmac_i2c_mode_stdsub: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 407 | mode_reg |= KW_I2C_MODE_STANDARDSUB; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 408 | if (subsize != 1) |
| 409 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 410 | break; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 411 | case pmac_i2c_mode_combined: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 412 | mode_reg |= KW_I2C_MODE_COMBINED; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 413 | if (subsize != 1) |
| 414 | return -EINVAL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 415 | break; |
| 416 | } |
| 417 | |
| 418 | /* Setup channel & clear pending irqs */ |
| 419 | kw_write_reg(reg_isr, kw_read_reg(reg_isr)); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 420 | kw_write_reg(reg_mode, mode_reg | (bus->channel << 4)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 421 | kw_write_reg(reg_status, 0); |
| 422 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 423 | /* Set up address and r/w bit, strip possible stale bus number from |
| 424 | * address top bits |
| 425 | */ |
| 426 | kw_write_reg(reg_addr, addrdir & 0xff); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 427 | |
| 428 | /* Set up the sub address */ |
| 429 | if ((mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB |
| 430 | || (mode_reg & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED) |
| 431 | kw_write_reg(reg_subaddr, subaddr); |
| 432 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 433 | /* Prepare for async operations */ |
| 434 | host->data = data; |
| 435 | host->len = len; |
| 436 | host->state = state_addr; |
| 437 | host->result = 0; |
| 438 | host->rw = (addrdir & 1); |
| 439 | host->polled = bus->polled; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 440 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 441 | /* Enable interrupt if not using polled mode and interrupt is |
| 442 | * available |
| 443 | */ |
| 444 | if (use_irq) { |
| 445 | /* Clear completion */ |
| 446 | INIT_COMPLETION(host->complete); |
| 447 | /* Ack stale interrupts */ |
| 448 | kw_write_reg(reg_isr, kw_read_reg(reg_isr)); |
| 449 | /* Arm timeout */ |
| 450 | host->timeout_timer.expires = jiffies + KW_POLL_TIMEOUT; |
| 451 | add_timer(&host->timeout_timer); |
| 452 | /* Enable emission */ |
| 453 | kw_write_reg(reg_ier, KW_I2C_IRQ_MASK); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 454 | } |
| 455 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 456 | /* Start sending address */ |
| 457 | kw_write_reg(reg_control, KW_I2C_CTL_XADDR); |
| 458 | |
| 459 | /* Wait for completion */ |
| 460 | if (use_irq) |
| 461 | wait_for_completion(&host->complete); |
| 462 | else { |
| 463 | while(host->state != state_idle) { |
| 464 | unsigned long flags; |
| 465 | |
| 466 | u8 isr = kw_i2c_wait_interrupt(host); |
| 467 | spin_lock_irqsave(&host->lock, flags); |
| 468 | kw_i2c_handle_interrupt(host, isr); |
| 469 | spin_unlock_irqrestore(&host->lock, flags); |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | /* Disable emission */ |
| 474 | kw_write_reg(reg_ier, 0); |
| 475 | |
| 476 | return host->result; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 477 | } |
| 478 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 479 | 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] | 480 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 481 | struct pmac_i2c_host_kw *host; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 482 | const u32 *psteps, *prate, *addrp; |
| 483 | u32 steps; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 484 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 485 | host = kzalloc(sizeof(struct pmac_i2c_host_kw), GFP_KERNEL); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 486 | if (host == NULL) { |
| 487 | printk(KERN_ERR "low_i2c: Can't allocate host for %s\n", |
| 488 | np->full_name); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 489 | return NULL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 490 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 491 | |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 492 | /* Apple is kind enough to provide a valid AAPL,address property |
| 493 | * on all i2c keywest nodes so far ... we would have to fallback |
| 494 | * to macio parsing if that wasn't the case |
| 495 | */ |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 496 | addrp = of_get_property(np, "AAPL,address", NULL); |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 497 | if (addrp == NULL) { |
| 498 | printk(KERN_ERR "low_i2c: Can't find address for %s\n", |
| 499 | np->full_name); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 500 | kfree(host); |
| 501 | return NULL; |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 502 | } |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 503 | mutex_init(&host->mutex); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 504 | init_completion(&host->complete); |
| 505 | spin_lock_init(&host->lock); |
| 506 | init_timer(&host->timeout_timer); |
| 507 | host->timeout_timer.function = kw_i2c_timeout; |
| 508 | host->timeout_timer.data = (unsigned long)host; |
| 509 | |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 510 | psteps = of_get_property(np, "AAPL,address-step", NULL); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 511 | steps = psteps ? (*psteps) : 0x10; |
| 512 | for (host->bsteps = 0; (steps & 0x01) == 0; host->bsteps++) |
| 513 | steps >>= 1; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 514 | /* Select interface rate */ |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 515 | host->speed = KW_I2C_MODE_25KHZ; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 516 | prate = of_get_property(np, "AAPL,i2c-rate", NULL); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 517 | if (prate) switch(*prate) { |
| 518 | case 100: |
| 519 | host->speed = KW_I2C_MODE_100KHZ; |
| 520 | break; |
| 521 | case 50: |
| 522 | host->speed = KW_I2C_MODE_50KHZ; |
| 523 | break; |
| 524 | case 25: |
| 525 | host->speed = KW_I2C_MODE_25KHZ; |
| 526 | break; |
| 527 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 528 | host->irq = irq_of_parse_and_map(np, 0); |
| 529 | if (host->irq == NO_IRQ) |
| 530 | printk(KERN_WARNING |
| 531 | "low_i2c: Failed to map interrupt for %s\n", |
| 532 | np->full_name); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 533 | |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 534 | host->base = ioremap((*addrp), 0x1000); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 535 | if (host->base == NULL) { |
| 536 | printk(KERN_ERR "low_i2c: Can't map registers for %s\n", |
| 537 | np->full_name); |
| 538 | kfree(host); |
| 539 | return NULL; |
| 540 | } |
| 541 | |
Benjamin Herrenschmidt | 60162e4 | 2006-04-18 14:11:53 +1000 | [diff] [blame] | 542 | /* Make sure IRQ is disabled */ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 543 | kw_write_reg(reg_ier, 0); |
| 544 | |
Benjamin Herrenschmidt | 11a5087 | 2009-10-09 11:27:54 +0000 | [diff] [blame] | 545 | /* Request chip interrupt. We set IRQF_TIMER because we don't |
| 546 | * want that interrupt disabled between the 2 passes of driver |
| 547 | * suspend or we'll have issues running the pfuncs |
| 548 | */ |
| 549 | if (request_irq(host->irq, kw_i2c_irq, IRQF_TIMER, "keywest i2c", host)) |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 550 | host->irq = NO_IRQ; |
| 551 | |
| 552 | printk(KERN_INFO "KeyWest i2c @0x%08x irq %d %s\n", |
| 553 | *addrp, host->irq, np->full_name); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 554 | |
| 555 | return host; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 556 | } |
| 557 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 558 | |
| 559 | static void __init kw_i2c_add(struct pmac_i2c_host_kw *host, |
| 560 | struct device_node *controller, |
| 561 | struct device_node *busnode, |
| 562 | int channel) |
| 563 | { |
| 564 | struct pmac_i2c_bus *bus; |
| 565 | |
| 566 | bus = kzalloc(sizeof(struct pmac_i2c_bus), GFP_KERNEL); |
| 567 | if (bus == NULL) |
| 568 | return; |
| 569 | |
| 570 | bus->controller = of_node_get(controller); |
| 571 | bus->busnode = of_node_get(busnode); |
| 572 | bus->type = pmac_i2c_bus_keywest; |
| 573 | bus->hostdata = host; |
| 574 | bus->channel = channel; |
| 575 | bus->mode = pmac_i2c_mode_std; |
| 576 | bus->open = kw_i2c_open; |
| 577 | bus->close = kw_i2c_close; |
| 578 | bus->xfer = kw_i2c_xfer; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 579 | mutex_init(&bus->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 580 | if (controller == busnode) |
| 581 | bus->flags = pmac_i2c_multibus; |
| 582 | list_add(&bus->link, &pmac_i2c_busses); |
| 583 | |
| 584 | printk(KERN_INFO " channel %d bus %s\n", channel, |
| 585 | (controller == busnode) ? "<multibus>" : busnode->full_name); |
| 586 | } |
| 587 | |
| 588 | static void __init kw_i2c_probe(void) |
| 589 | { |
| 590 | struct device_node *np, *child, *parent; |
| 591 | |
| 592 | /* Probe keywest-i2c busses */ |
Cyrill Gorcunov | dc2e425 | 2007-11-30 06:46:54 +1100 | [diff] [blame] | 593 | for_each_compatible_node(np, "i2c","keywest-i2c") { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 594 | struct pmac_i2c_host_kw *host; |
| 595 | int multibus, chans, i; |
| 596 | |
| 597 | /* Found one, init a host structure */ |
| 598 | host = kw_i2c_host_init(np); |
| 599 | if (host == NULL) |
| 600 | continue; |
| 601 | |
| 602 | /* Now check if we have a multibus setup (old style) or if we |
| 603 | * have proper bus nodes. Note that the "new" way (proper bus |
| 604 | * nodes) might cause us to not create some busses that are |
| 605 | * kept hidden in the device-tree. In the future, we might |
| 606 | * want to work around that by creating busses without a node |
| 607 | * but not for now |
| 608 | */ |
| 609 | child = of_get_next_child(np, NULL); |
| 610 | multibus = !child || strcmp(child->name, "i2c-bus"); |
| 611 | of_node_put(child); |
| 612 | |
| 613 | /* For a multibus setup, we get the bus count based on the |
| 614 | * parent type |
| 615 | */ |
| 616 | if (multibus) { |
| 617 | parent = of_get_parent(np); |
| 618 | if (parent == NULL) |
| 619 | continue; |
| 620 | chans = parent->name[0] == 'u' ? 2 : 1; |
| 621 | for (i = 0; i < chans; i++) |
| 622 | kw_i2c_add(host, np, np, i); |
| 623 | } else { |
| 624 | for (child = NULL; |
| 625 | (child = of_get_next_child(np, child)) != NULL;) { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 626 | const u32 *reg = of_get_property(child, |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 627 | "reg", NULL); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 628 | if (reg == NULL) |
| 629 | continue; |
| 630 | kw_i2c_add(host, np, child, *reg); |
| 631 | } |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 637 | /* |
| 638 | * |
| 639 | * PMU implementation |
| 640 | * |
| 641 | */ |
| 642 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 643 | #ifdef CONFIG_ADB_PMU |
| 644 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 645 | /* |
| 646 | * i2c command block to the PMU |
| 647 | */ |
| 648 | struct pmu_i2c_hdr { |
| 649 | u8 bus; |
| 650 | u8 mode; |
| 651 | u8 bus2; |
| 652 | u8 address; |
| 653 | u8 sub_addr; |
| 654 | u8 comb_addr; |
| 655 | u8 count; |
| 656 | u8 data[]; |
| 657 | }; |
| 658 | |
| 659 | static void pmu_i2c_complete(struct adb_request *req) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 660 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 661 | complete(req->arg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 662 | } |
| 663 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 664 | static int pmu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 665 | u32 subaddr, u8 *data, int len) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 666 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 667 | struct adb_request *req = bus->hostdata; |
| 668 | struct pmu_i2c_hdr *hdr = (struct pmu_i2c_hdr *)&req->data[1]; |
| 669 | struct completion comp; |
| 670 | int read = addrdir & 1; |
| 671 | int retry; |
| 672 | int rc = 0; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 673 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 674 | /* For now, limit ourselves to 16 bytes transfers */ |
| 675 | if (len > 16) |
| 676 | return -EINVAL; |
| 677 | |
| 678 | init_completion(&comp); |
| 679 | |
| 680 | for (retry = 0; retry < 16; retry++) { |
| 681 | memset(req, 0, sizeof(struct adb_request)); |
| 682 | hdr->bus = bus->channel; |
| 683 | hdr->count = len; |
| 684 | |
| 685 | switch(bus->mode) { |
| 686 | case pmac_i2c_mode_std: |
| 687 | if (subsize != 0) |
| 688 | return -EINVAL; |
| 689 | hdr->address = addrdir; |
| 690 | hdr->mode = PMU_I2C_MODE_SIMPLE; |
| 691 | break; |
| 692 | case pmac_i2c_mode_stdsub: |
| 693 | case pmac_i2c_mode_combined: |
| 694 | if (subsize != 1) |
| 695 | return -EINVAL; |
| 696 | hdr->address = addrdir & 0xfe; |
| 697 | hdr->comb_addr = addrdir; |
| 698 | hdr->sub_addr = subaddr; |
| 699 | if (bus->mode == pmac_i2c_mode_stdsub) |
| 700 | hdr->mode = PMU_I2C_MODE_STDSUB; |
| 701 | else |
| 702 | hdr->mode = PMU_I2C_MODE_COMBINED; |
| 703 | break; |
| 704 | default: |
| 705 | return -EINVAL; |
| 706 | } |
| 707 | |
| 708 | INIT_COMPLETION(comp); |
| 709 | req->data[0] = PMU_I2C_CMD; |
| 710 | req->reply[0] = 0xff; |
| 711 | req->nbytes = sizeof(struct pmu_i2c_hdr) + 1; |
| 712 | req->done = pmu_i2c_complete; |
| 713 | req->arg = ∁ |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 714 | if (!read && len) { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 715 | memcpy(hdr->data, data, len); |
| 716 | req->nbytes += len; |
| 717 | } |
| 718 | rc = pmu_queue_request(req); |
| 719 | if (rc) |
| 720 | return rc; |
| 721 | wait_for_completion(&comp); |
| 722 | if (req->reply[0] == PMU_I2C_STATUS_OK) |
| 723 | break; |
| 724 | msleep(15); |
| 725 | } |
| 726 | if (req->reply[0] != PMU_I2C_STATUS_OK) |
| 727 | return -EIO; |
| 728 | |
| 729 | for (retry = 0; retry < 16; retry++) { |
| 730 | memset(req, 0, sizeof(struct adb_request)); |
| 731 | |
| 732 | /* I know that looks like a lot, slow as hell, but darwin |
| 733 | * does it so let's be on the safe side for now |
| 734 | */ |
| 735 | msleep(15); |
| 736 | |
| 737 | hdr->bus = PMU_I2C_BUS_STATUS; |
| 738 | |
| 739 | INIT_COMPLETION(comp); |
| 740 | req->data[0] = PMU_I2C_CMD; |
| 741 | req->reply[0] = 0xff; |
| 742 | req->nbytes = 2; |
| 743 | req->done = pmu_i2c_complete; |
| 744 | req->arg = ∁ |
| 745 | rc = pmu_queue_request(req); |
| 746 | if (rc) |
| 747 | return rc; |
| 748 | wait_for_completion(&comp); |
| 749 | |
| 750 | if (req->reply[0] == PMU_I2C_STATUS_OK && !read) |
| 751 | return 0; |
| 752 | if (req->reply[0] == PMU_I2C_STATUS_DATAREAD && read) { |
| 753 | int rlen = req->reply_len - 1; |
| 754 | |
| 755 | if (rlen != len) { |
| 756 | printk(KERN_WARNING "low_i2c: PMU returned %d" |
| 757 | " bytes, expected %d !\n", rlen, len); |
| 758 | return -EIO; |
| 759 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 760 | if (len) |
| 761 | memcpy(data, &req->reply[1], len); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 762 | return 0; |
| 763 | } |
| 764 | } |
| 765 | return -EIO; |
| 766 | } |
| 767 | |
| 768 | static void __init pmu_i2c_probe(void) |
| 769 | { |
| 770 | struct pmac_i2c_bus *bus; |
| 771 | struct device_node *busnode; |
| 772 | int channel, sz; |
| 773 | |
| 774 | if (!pmu_present()) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 775 | return; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 776 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 777 | /* There might or might not be a "pmu-i2c" node, we use that |
| 778 | * or via-pmu itself, whatever we find. I haven't seen a machine |
| 779 | * with separate bus nodes, so we assume a multibus setup |
| 780 | */ |
| 781 | busnode = of_find_node_by_name(NULL, "pmu-i2c"); |
| 782 | if (busnode == NULL) |
| 783 | busnode = of_find_node_by_name(NULL, "via-pmu"); |
| 784 | if (busnode == NULL) |
| 785 | return; |
| 786 | |
| 787 | printk(KERN_INFO "PMU i2c %s\n", busnode->full_name); |
| 788 | |
| 789 | /* |
| 790 | * We add bus 1 and 2 only for now, bus 0 is "special" |
| 791 | */ |
| 792 | for (channel = 1; channel <= 2; channel++) { |
| 793 | sz = sizeof(struct pmac_i2c_bus) + sizeof(struct adb_request); |
| 794 | bus = kzalloc(sz, GFP_KERNEL); |
| 795 | if (bus == NULL) |
| 796 | return; |
| 797 | |
| 798 | bus->controller = busnode; |
| 799 | bus->busnode = busnode; |
| 800 | bus->type = pmac_i2c_bus_pmu; |
| 801 | bus->channel = channel; |
| 802 | bus->mode = pmac_i2c_mode_std; |
| 803 | bus->hostdata = bus + 1; |
| 804 | bus->xfer = pmu_i2c_xfer; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 805 | mutex_init(&bus->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 806 | bus->flags = pmac_i2c_multibus; |
| 807 | list_add(&bus->link, &pmac_i2c_busses); |
| 808 | |
| 809 | printk(KERN_INFO " channel %d bus <multibus>\n", channel); |
| 810 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | #endif /* CONFIG_ADB_PMU */ |
| 814 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 815 | |
| 816 | /* |
| 817 | * |
| 818 | * SMU implementation |
| 819 | * |
| 820 | */ |
| 821 | |
| 822 | #ifdef CONFIG_PMAC_SMU |
| 823 | |
| 824 | static void smu_i2c_complete(struct smu_i2c_cmd *cmd, void *misc) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 825 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 826 | complete(misc); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 827 | } |
| 828 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 829 | static int smu_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 830 | u32 subaddr, u8 *data, int len) |
| 831 | { |
| 832 | struct smu_i2c_cmd *cmd = bus->hostdata; |
| 833 | struct completion comp; |
| 834 | int read = addrdir & 1; |
| 835 | int rc = 0; |
| 836 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 837 | if ((read && len > SMU_I2C_READ_MAX) || |
| 838 | ((!read) && len > SMU_I2C_WRITE_MAX)) |
| 839 | return -EINVAL; |
| 840 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 841 | memset(cmd, 0, sizeof(struct smu_i2c_cmd)); |
| 842 | cmd->info.bus = bus->channel; |
| 843 | cmd->info.devaddr = addrdir; |
| 844 | cmd->info.datalen = len; |
| 845 | |
| 846 | switch(bus->mode) { |
| 847 | case pmac_i2c_mode_std: |
| 848 | if (subsize != 0) |
| 849 | return -EINVAL; |
| 850 | cmd->info.type = SMU_I2C_TRANSFER_SIMPLE; |
| 851 | break; |
| 852 | case pmac_i2c_mode_stdsub: |
| 853 | case pmac_i2c_mode_combined: |
| 854 | if (subsize > 3 || subsize < 1) |
| 855 | return -EINVAL; |
| 856 | cmd->info.sublen = subsize; |
| 857 | /* that's big-endian only but heh ! */ |
| 858 | memcpy(&cmd->info.subaddr, ((char *)&subaddr) + (4 - subsize), |
| 859 | subsize); |
| 860 | if (bus->mode == pmac_i2c_mode_stdsub) |
| 861 | cmd->info.type = SMU_I2C_TRANSFER_STDSUB; |
| 862 | else |
| 863 | cmd->info.type = SMU_I2C_TRANSFER_COMBINED; |
| 864 | break; |
| 865 | default: |
| 866 | return -EINVAL; |
| 867 | } |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 868 | if (!read && len) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 869 | memcpy(cmd->info.data, data, len); |
| 870 | |
| 871 | init_completion(&comp); |
| 872 | cmd->done = smu_i2c_complete; |
| 873 | cmd->misc = ∁ |
| 874 | rc = smu_queue_i2c(cmd); |
| 875 | if (rc < 0) |
| 876 | return rc; |
| 877 | wait_for_completion(&comp); |
| 878 | rc = cmd->status; |
| 879 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 880 | if (read && len) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 881 | memcpy(data, cmd->info.data, len); |
| 882 | return rc < 0 ? rc : 0; |
| 883 | } |
| 884 | |
| 885 | static void __init smu_i2c_probe(void) |
| 886 | { |
| 887 | struct device_node *controller, *busnode; |
| 888 | struct pmac_i2c_bus *bus; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 889 | const u32 *reg; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 890 | int sz; |
| 891 | |
| 892 | if (!smu_present()) |
| 893 | return; |
| 894 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 895 | controller = of_find_node_by_name(NULL, "smu-i2c-control"); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 896 | if (controller == NULL) |
| 897 | controller = of_find_node_by_name(NULL, "smu"); |
| 898 | if (controller == NULL) |
| 899 | return; |
| 900 | |
| 901 | printk(KERN_INFO "SMU i2c %s\n", controller->full_name); |
| 902 | |
| 903 | /* Look for childs, note that they might not be of the right |
| 904 | * type as older device trees mix i2c busses and other thigns |
| 905 | * at the same level |
| 906 | */ |
| 907 | for (busnode = NULL; |
| 908 | (busnode = of_get_next_child(controller, busnode)) != NULL;) { |
| 909 | if (strcmp(busnode->type, "i2c") && |
| 910 | strcmp(busnode->type, "i2c-bus")) |
| 911 | continue; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 912 | reg = of_get_property(busnode, "reg", NULL); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 913 | if (reg == NULL) |
| 914 | continue; |
| 915 | |
| 916 | sz = sizeof(struct pmac_i2c_bus) + sizeof(struct smu_i2c_cmd); |
| 917 | bus = kzalloc(sz, GFP_KERNEL); |
| 918 | if (bus == NULL) |
| 919 | return; |
| 920 | |
| 921 | bus->controller = controller; |
| 922 | bus->busnode = of_node_get(busnode); |
| 923 | bus->type = pmac_i2c_bus_smu; |
| 924 | bus->channel = *reg; |
| 925 | bus->mode = pmac_i2c_mode_std; |
| 926 | bus->hostdata = bus + 1; |
| 927 | bus->xfer = smu_i2c_xfer; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 928 | mutex_init(&bus->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 929 | bus->flags = 0; |
| 930 | list_add(&bus->link, &pmac_i2c_busses); |
| 931 | |
| 932 | printk(KERN_INFO " channel %x bus %s\n", |
| 933 | bus->channel, busnode->full_name); |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | #endif /* CONFIG_PMAC_SMU */ |
| 938 | |
| 939 | /* |
| 940 | * |
| 941 | * Core code |
| 942 | * |
| 943 | */ |
| 944 | |
| 945 | |
| 946 | struct pmac_i2c_bus *pmac_i2c_find_bus(struct device_node *node) |
| 947 | { |
| 948 | struct device_node *p = of_node_get(node); |
| 949 | struct device_node *prev = NULL; |
| 950 | struct pmac_i2c_bus *bus; |
| 951 | |
| 952 | while(p) { |
| 953 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 954 | if (p == bus->busnode) { |
| 955 | if (prev && bus->flags & pmac_i2c_multibus) { |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 956 | const u32 *reg; |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 957 | reg = of_get_property(prev, "reg", |
| 958 | NULL); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 959 | if (!reg) |
| 960 | continue; |
| 961 | if (((*reg) >> 8) != bus->channel) |
| 962 | continue; |
| 963 | } |
| 964 | of_node_put(p); |
| 965 | of_node_put(prev); |
| 966 | return bus; |
| 967 | } |
| 968 | } |
| 969 | of_node_put(prev); |
| 970 | prev = p; |
| 971 | p = of_get_parent(p); |
| 972 | } |
| 973 | return NULL; |
| 974 | } |
| 975 | EXPORT_SYMBOL_GPL(pmac_i2c_find_bus); |
| 976 | |
| 977 | u8 pmac_i2c_get_dev_addr(struct device_node *device) |
| 978 | { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 979 | const u32 *reg = of_get_property(device, "reg", NULL); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 980 | |
| 981 | if (reg == NULL) |
| 982 | return 0; |
| 983 | |
| 984 | return (*reg) & 0xff; |
| 985 | } |
| 986 | EXPORT_SYMBOL_GPL(pmac_i2c_get_dev_addr); |
| 987 | |
| 988 | struct device_node *pmac_i2c_get_controller(struct pmac_i2c_bus *bus) |
| 989 | { |
| 990 | return bus->controller; |
| 991 | } |
| 992 | EXPORT_SYMBOL_GPL(pmac_i2c_get_controller); |
| 993 | |
| 994 | struct device_node *pmac_i2c_get_bus_node(struct pmac_i2c_bus *bus) |
| 995 | { |
| 996 | return bus->busnode; |
| 997 | } |
| 998 | EXPORT_SYMBOL_GPL(pmac_i2c_get_bus_node); |
| 999 | |
| 1000 | int pmac_i2c_get_type(struct pmac_i2c_bus *bus) |
| 1001 | { |
| 1002 | return bus->type; |
| 1003 | } |
| 1004 | EXPORT_SYMBOL_GPL(pmac_i2c_get_type); |
| 1005 | |
| 1006 | int pmac_i2c_get_flags(struct pmac_i2c_bus *bus) |
| 1007 | { |
| 1008 | return bus->flags; |
| 1009 | } |
| 1010 | EXPORT_SYMBOL_GPL(pmac_i2c_get_flags); |
| 1011 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1012 | int pmac_i2c_get_channel(struct pmac_i2c_bus *bus) |
| 1013 | { |
| 1014 | return bus->channel; |
| 1015 | } |
| 1016 | EXPORT_SYMBOL_GPL(pmac_i2c_get_channel); |
| 1017 | |
| 1018 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1019 | struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus) |
| 1020 | { |
Jean Delvare | 6dfa5ca | 2009-12-06 17:06:19 +0100 | [diff] [blame] | 1021 | return &bus->adapter; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1022 | } |
| 1023 | EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter); |
| 1024 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1025 | struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter) |
| 1026 | { |
| 1027 | struct pmac_i2c_bus *bus; |
| 1028 | |
| 1029 | list_for_each_entry(bus, &pmac_i2c_busses, link) |
Jean Delvare | 6dfa5ca | 2009-12-06 17:06:19 +0100 | [diff] [blame] | 1030 | if (&bus->adapter == adapter) |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1031 | return bus; |
| 1032 | return NULL; |
| 1033 | } |
| 1034 | EXPORT_SYMBOL_GPL(pmac_i2c_adapter_to_bus); |
| 1035 | |
Al Viro | 1d0bd71 | 2006-02-01 07:25:14 -0500 | [diff] [blame] | 1036 | 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] | 1037 | { |
| 1038 | struct pmac_i2c_bus *bus = pmac_i2c_find_bus(dev); |
| 1039 | |
| 1040 | if (bus == NULL) |
| 1041 | return 0; |
Jean Delvare | 6dfa5ca | 2009-12-06 17:06:19 +0100 | [diff] [blame] | 1042 | return (&bus->adapter == adapter); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1043 | } |
| 1044 | EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter); |
| 1045 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1046 | int pmac_low_i2c_lock(struct device_node *np) |
| 1047 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1048 | struct pmac_i2c_bus *bus, *found = NULL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1049 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1050 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1051 | if (np == bus->controller) { |
| 1052 | found = bus; |
| 1053 | break; |
| 1054 | } |
| 1055 | } |
| 1056 | if (!found) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1057 | return -ENODEV; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1058 | return pmac_i2c_open(bus, 0); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1059 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1060 | EXPORT_SYMBOL_GPL(pmac_low_i2c_lock); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1061 | |
| 1062 | int pmac_low_i2c_unlock(struct device_node *np) |
| 1063 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1064 | struct pmac_i2c_bus *bus, *found = NULL; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1065 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1066 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1067 | if (np == bus->controller) { |
| 1068 | found = bus; |
| 1069 | break; |
| 1070 | } |
| 1071 | } |
| 1072 | if (!found) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1073 | return -ENODEV; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1074 | pmac_i2c_close(bus); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1075 | return 0; |
| 1076 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1077 | EXPORT_SYMBOL_GPL(pmac_low_i2c_unlock); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1078 | |
| 1079 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1080 | int pmac_i2c_open(struct pmac_i2c_bus *bus, int polled) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1081 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1082 | int rc; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1083 | |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 1084 | mutex_lock(&bus->mutex); |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1085 | bus->polled = polled || pmac_i2c_force_poll; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1086 | bus->opened = 1; |
| 1087 | bus->mode = pmac_i2c_mode_std; |
| 1088 | if (bus->open && (rc = bus->open(bus)) != 0) { |
| 1089 | bus->opened = 0; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 1090 | mutex_unlock(&bus->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1091 | return rc; |
| 1092 | } |
| 1093 | return 0; |
| 1094 | } |
| 1095 | EXPORT_SYMBOL_GPL(pmac_i2c_open); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1096 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1097 | void pmac_i2c_close(struct pmac_i2c_bus *bus) |
| 1098 | { |
| 1099 | WARN_ON(!bus->opened); |
| 1100 | if (bus->close) |
| 1101 | bus->close(bus); |
| 1102 | bus->opened = 0; |
Johannes Berg | 76a5b8b | 2007-07-04 09:01:54 +1000 | [diff] [blame] | 1103 | mutex_unlock(&bus->mutex); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1104 | } |
| 1105 | EXPORT_SYMBOL_GPL(pmac_i2c_close); |
| 1106 | |
| 1107 | int pmac_i2c_setmode(struct pmac_i2c_bus *bus, int mode) |
| 1108 | { |
| 1109 | WARN_ON(!bus->opened); |
| 1110 | |
| 1111 | /* Report me if you see the error below as there might be a new |
| 1112 | * "combined4" mode that I need to implement for the SMU bus |
| 1113 | */ |
| 1114 | if (mode < pmac_i2c_mode_dumb || mode > pmac_i2c_mode_combined) { |
| 1115 | printk(KERN_ERR "low_i2c: Invalid mode %d requested on" |
| 1116 | " bus %s !\n", mode, bus->busnode->full_name); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1117 | return -EINVAL; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1118 | } |
| 1119 | bus->mode = mode; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1120 | |
| 1121 | return 0; |
| 1122 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1123 | EXPORT_SYMBOL_GPL(pmac_i2c_setmode); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1124 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1125 | int pmac_i2c_xfer(struct pmac_i2c_bus *bus, u8 addrdir, int subsize, |
| 1126 | u32 subaddr, u8 *data, int len) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1127 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1128 | int rc; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1129 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1130 | WARN_ON(!bus->opened); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1131 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1132 | DBG("xfer() chan=%d, addrdir=0x%x, mode=%d, subsize=%d, subaddr=0x%x," |
| 1133 | " %d bytes, bus %s\n", bus->channel, addrdir, bus->mode, subsize, |
| 1134 | subaddr, len, bus->busnode->full_name); |
| 1135 | |
| 1136 | rc = bus->xfer(bus, addrdir, subsize, subaddr, data, len); |
| 1137 | |
| 1138 | #ifdef DEBUG |
| 1139 | if (rc) |
| 1140 | DBG("xfer error %d\n", rc); |
| 1141 | #endif |
| 1142 | return rc; |
| 1143 | } |
| 1144 | EXPORT_SYMBOL_GPL(pmac_i2c_xfer); |
| 1145 | |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1146 | /* some quirks for platform function decoding */ |
| 1147 | enum { |
| 1148 | pmac_i2c_quirk_invmask = 0x00000001u, |
Benjamin Herrenschmidt | 5a47d74 | 2006-05-30 21:26:51 -0700 | [diff] [blame] | 1149 | pmac_i2c_quirk_skip = 0x00000002u, |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1150 | }; |
| 1151 | |
| 1152 | static void pmac_i2c_devscan(void (*callback)(struct device_node *dev, |
| 1153 | int quirks)) |
| 1154 | { |
| 1155 | struct pmac_i2c_bus *bus; |
| 1156 | struct device_node *np; |
| 1157 | static struct whitelist_ent { |
| 1158 | char *name; |
| 1159 | char *compatible; |
| 1160 | int quirks; |
| 1161 | } whitelist[] = { |
| 1162 | /* XXX Study device-tree's & apple drivers are get the quirks |
| 1163 | * right ! |
| 1164 | */ |
Benjamin Herrenschmidt | 5a47d74 | 2006-05-30 21:26:51 -0700 | [diff] [blame] | 1165 | /* Workaround: It seems that running the clockspreading |
| 1166 | * properties on the eMac will cause lockups during boot. |
| 1167 | * The machine seems to work fine without that. So for now, |
| 1168 | * let's make sure i2c-hwclock doesn't match about "imic" |
| 1169 | * clocks and we'll figure out if we really need to do |
| 1170 | * something special about those later. |
| 1171 | */ |
| 1172 | { "i2c-hwclock", "imic5002", pmac_i2c_quirk_skip }, |
| 1173 | { "i2c-hwclock", "imic5003", pmac_i2c_quirk_skip }, |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1174 | { "i2c-hwclock", NULL, pmac_i2c_quirk_invmask }, |
| 1175 | { "i2c-cpu-voltage", NULL, 0}, |
| 1176 | { "temp-monitor", NULL, 0 }, |
| 1177 | { "supply-monitor", NULL, 0 }, |
| 1178 | { NULL, NULL, 0 }, |
| 1179 | }; |
| 1180 | |
| 1181 | /* Only some devices need to have platform functions instanciated |
| 1182 | * here. For now, we have a table. Others, like 9554 i2c GPIOs used |
| 1183 | * on Xserve, if we ever do a driver for them, will use their own |
| 1184 | * platform function instance |
| 1185 | */ |
| 1186 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1187 | for (np = NULL; |
| 1188 | (np = of_get_next_child(bus->busnode, np)) != NULL;) { |
| 1189 | struct whitelist_ent *p; |
| 1190 | /* If multibus, check if device is on that bus */ |
| 1191 | if (bus->flags & pmac_i2c_multibus) |
| 1192 | if (bus != pmac_i2c_find_bus(np)) |
| 1193 | continue; |
| 1194 | for (p = whitelist; p->name != NULL; p++) { |
| 1195 | if (strcmp(np->name, p->name)) |
| 1196 | continue; |
| 1197 | if (p->compatible && |
Stephen Rothwell | 55b61fe | 2007-05-03 17:26:52 +1000 | [diff] [blame] | 1198 | !of_device_is_compatible(np, p->compatible)) |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1199 | continue; |
Benjamin Herrenschmidt | 5a47d74 | 2006-05-30 21:26:51 -0700 | [diff] [blame] | 1200 | if (p->quirks & pmac_i2c_quirk_skip) |
| 1201 | break; |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1202 | callback(np, p->quirks); |
| 1203 | break; |
| 1204 | } |
| 1205 | } |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | #define MAX_I2C_DATA 64 |
| 1210 | |
| 1211 | struct pmac_i2c_pf_inst |
| 1212 | { |
| 1213 | struct pmac_i2c_bus *bus; |
| 1214 | u8 addr; |
| 1215 | u8 buffer[MAX_I2C_DATA]; |
| 1216 | u8 scratch[MAX_I2C_DATA]; |
| 1217 | int bytes; |
| 1218 | int quirks; |
| 1219 | }; |
| 1220 | |
| 1221 | static void* pmac_i2c_do_begin(struct pmf_function *func, struct pmf_args *args) |
| 1222 | { |
| 1223 | struct pmac_i2c_pf_inst *inst; |
| 1224 | struct pmac_i2c_bus *bus; |
| 1225 | |
| 1226 | bus = pmac_i2c_find_bus(func->node); |
| 1227 | if (bus == NULL) { |
| 1228 | printk(KERN_ERR "low_i2c: Can't find bus for %s (pfunc)\n", |
| 1229 | func->node->full_name); |
| 1230 | return NULL; |
| 1231 | } |
| 1232 | if (pmac_i2c_open(bus, 0)) { |
| 1233 | printk(KERN_ERR "low_i2c: Can't open i2c bus for %s (pfunc)\n", |
| 1234 | func->node->full_name); |
| 1235 | return NULL; |
| 1236 | } |
| 1237 | |
| 1238 | /* XXX might need GFP_ATOMIC when called during the suspend process, |
| 1239 | * but then, there are already lots of issues with suspending when |
| 1240 | * near OOM that need to be resolved, the allocator itself should |
| 1241 | * probably make GFP_NOIO implicit during suspend |
| 1242 | */ |
| 1243 | inst = kzalloc(sizeof(struct pmac_i2c_pf_inst), GFP_KERNEL); |
| 1244 | if (inst == NULL) { |
| 1245 | pmac_i2c_close(bus); |
| 1246 | return NULL; |
| 1247 | } |
| 1248 | inst->bus = bus; |
| 1249 | inst->addr = pmac_i2c_get_dev_addr(func->node); |
| 1250 | inst->quirks = (int)(long)func->driver_data; |
| 1251 | return inst; |
| 1252 | } |
| 1253 | |
| 1254 | static void pmac_i2c_do_end(struct pmf_function *func, void *instdata) |
| 1255 | { |
| 1256 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1257 | |
| 1258 | if (inst == NULL) |
| 1259 | return; |
| 1260 | pmac_i2c_close(inst->bus); |
| 1261 | if (inst) |
| 1262 | kfree(inst); |
| 1263 | } |
| 1264 | |
| 1265 | static int pmac_i2c_do_read(PMF_STD_ARGS, u32 len) |
| 1266 | { |
| 1267 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1268 | |
| 1269 | inst->bytes = len; |
| 1270 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 0, 0, |
| 1271 | inst->buffer, len); |
| 1272 | } |
| 1273 | |
| 1274 | static int pmac_i2c_do_write(PMF_STD_ARGS, u32 len, const u8 *data) |
| 1275 | { |
| 1276 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1277 | |
| 1278 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0, |
| 1279 | (u8 *)data, len); |
| 1280 | } |
| 1281 | |
| 1282 | /* This function is used to do the masking & OR'ing for the "rmw" type |
| 1283 | * callbacks. Ze should apply the mask and OR in the values in the |
| 1284 | * buffer before writing back. The problem is that it seems that |
| 1285 | * various darwin drivers implement the mask/or differently, thus |
| 1286 | * we need to check the quirks first |
| 1287 | */ |
| 1288 | static void pmac_i2c_do_apply_rmw(struct pmac_i2c_pf_inst *inst, |
| 1289 | u32 len, const u8 *mask, const u8 *val) |
| 1290 | { |
| 1291 | int i; |
| 1292 | |
| 1293 | if (inst->quirks & pmac_i2c_quirk_invmask) { |
| 1294 | for (i = 0; i < len; i ++) |
| 1295 | inst->scratch[i] = (inst->buffer[i] & mask[i]) | val[i]; |
| 1296 | } else { |
| 1297 | for (i = 0; i < len; i ++) |
| 1298 | inst->scratch[i] = (inst->buffer[i] & ~mask[i]) |
| 1299 | | (val[i] & mask[i]); |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | static int pmac_i2c_do_rmw(PMF_STD_ARGS, u32 masklen, u32 valuelen, |
| 1304 | u32 totallen, const u8 *maskdata, |
| 1305 | const u8 *valuedata) |
| 1306 | { |
| 1307 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1308 | |
| 1309 | if (masklen > inst->bytes || valuelen > inst->bytes || |
| 1310 | totallen > inst->bytes || valuelen > masklen) |
| 1311 | return -EINVAL; |
| 1312 | |
| 1313 | pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata); |
| 1314 | |
| 1315 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 0, 0, |
| 1316 | inst->scratch, totallen); |
| 1317 | } |
| 1318 | |
| 1319 | static int pmac_i2c_do_read_sub(PMF_STD_ARGS, u8 subaddr, u32 len) |
| 1320 | { |
| 1321 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1322 | |
| 1323 | inst->bytes = len; |
| 1324 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_read, 1, subaddr, |
| 1325 | inst->buffer, len); |
| 1326 | } |
| 1327 | |
| 1328 | static int pmac_i2c_do_write_sub(PMF_STD_ARGS, u8 subaddr, u32 len, |
| 1329 | const u8 *data) |
| 1330 | { |
| 1331 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1332 | |
| 1333 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1, |
| 1334 | subaddr, (u8 *)data, len); |
| 1335 | } |
| 1336 | |
| 1337 | static int pmac_i2c_do_set_mode(PMF_STD_ARGS, int mode) |
| 1338 | { |
| 1339 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1340 | |
| 1341 | return pmac_i2c_setmode(inst->bus, mode); |
| 1342 | } |
| 1343 | |
| 1344 | static int pmac_i2c_do_rmw_sub(PMF_STD_ARGS, u8 subaddr, u32 masklen, |
| 1345 | u32 valuelen, u32 totallen, const u8 *maskdata, |
| 1346 | const u8 *valuedata) |
| 1347 | { |
| 1348 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1349 | |
| 1350 | if (masklen > inst->bytes || valuelen > inst->bytes || |
| 1351 | totallen > inst->bytes || valuelen > masklen) |
| 1352 | return -EINVAL; |
| 1353 | |
| 1354 | pmac_i2c_do_apply_rmw(inst, masklen, maskdata, valuedata); |
| 1355 | |
| 1356 | return pmac_i2c_xfer(inst->bus, inst->addr | pmac_i2c_write, 1, |
| 1357 | subaddr, inst->scratch, totallen); |
| 1358 | } |
| 1359 | |
| 1360 | static int pmac_i2c_do_mask_and_comp(PMF_STD_ARGS, u32 len, |
| 1361 | const u8 *maskdata, |
| 1362 | const u8 *valuedata) |
| 1363 | { |
| 1364 | struct pmac_i2c_pf_inst *inst = instdata; |
| 1365 | int i, match; |
| 1366 | |
| 1367 | /* Get return value pointer, it's assumed to be a u32 */ |
| 1368 | if (!args || !args->count || !args->u[0].p) |
| 1369 | return -EINVAL; |
| 1370 | |
| 1371 | /* Check buffer */ |
| 1372 | if (len > inst->bytes) |
| 1373 | return -EINVAL; |
| 1374 | |
| 1375 | for (i = 0, match = 1; match && i < len; i ++) |
| 1376 | if ((inst->buffer[i] & maskdata[i]) != valuedata[i]) |
| 1377 | match = 0; |
| 1378 | *args->u[0].p = match; |
| 1379 | return 0; |
| 1380 | } |
| 1381 | |
| 1382 | static int pmac_i2c_do_delay(PMF_STD_ARGS, u32 duration) |
| 1383 | { |
| 1384 | msleep((duration + 999) / 1000); |
| 1385 | return 0; |
| 1386 | } |
| 1387 | |
| 1388 | |
| 1389 | static struct pmf_handlers pmac_i2c_pfunc_handlers = { |
| 1390 | .begin = pmac_i2c_do_begin, |
| 1391 | .end = pmac_i2c_do_end, |
| 1392 | .read_i2c = pmac_i2c_do_read, |
| 1393 | .write_i2c = pmac_i2c_do_write, |
| 1394 | .rmw_i2c = pmac_i2c_do_rmw, |
| 1395 | .read_i2c_sub = pmac_i2c_do_read_sub, |
| 1396 | .write_i2c_sub = pmac_i2c_do_write_sub, |
| 1397 | .rmw_i2c_sub = pmac_i2c_do_rmw_sub, |
| 1398 | .set_i2c_mode = pmac_i2c_do_set_mode, |
| 1399 | .mask_and_compare = pmac_i2c_do_mask_and_comp, |
| 1400 | .delay = pmac_i2c_do_delay, |
| 1401 | }; |
| 1402 | |
| 1403 | static void __init pmac_i2c_dev_create(struct device_node *np, int quirks) |
| 1404 | { |
| 1405 | DBG("dev_create(%s)\n", np->full_name); |
| 1406 | |
| 1407 | pmf_register_driver(np, &pmac_i2c_pfunc_handlers, |
| 1408 | (void *)(long)quirks); |
| 1409 | } |
| 1410 | |
| 1411 | static void __init pmac_i2c_dev_init(struct device_node *np, int quirks) |
| 1412 | { |
| 1413 | DBG("dev_create(%s)\n", np->full_name); |
| 1414 | |
| 1415 | pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_INIT, NULL); |
| 1416 | } |
| 1417 | |
| 1418 | static void pmac_i2c_dev_suspend(struct device_node *np, int quirks) |
| 1419 | { |
| 1420 | DBG("dev_suspend(%s)\n", np->full_name); |
| 1421 | pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_SLEEP, NULL); |
| 1422 | } |
| 1423 | |
| 1424 | static void pmac_i2c_dev_resume(struct device_node *np, int quirks) |
| 1425 | { |
| 1426 | DBG("dev_resume(%s)\n", np->full_name); |
| 1427 | pmf_do_functions(np, NULL, 0, PMF_FLAGS_ON_WAKE, NULL); |
| 1428 | } |
| 1429 | |
| 1430 | void pmac_pfunc_i2c_suspend(void) |
| 1431 | { |
| 1432 | pmac_i2c_devscan(pmac_i2c_dev_suspend); |
| 1433 | } |
| 1434 | |
| 1435 | void pmac_pfunc_i2c_resume(void) |
| 1436 | { |
| 1437 | pmac_i2c_devscan(pmac_i2c_dev_resume); |
| 1438 | } |
| 1439 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1440 | /* |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1441 | * Initialize us: probe all i2c busses on the machine, instantiate |
| 1442 | * busses and platform functions as needed. |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1443 | */ |
| 1444 | /* This is non-static as it might be called early by smp code */ |
| 1445 | int __init pmac_i2c_init(void) |
| 1446 | { |
| 1447 | static int i2c_inited; |
| 1448 | |
| 1449 | if (i2c_inited) |
| 1450 | return 0; |
| 1451 | i2c_inited = 1; |
| 1452 | |
| 1453 | /* Probe keywest-i2c busses */ |
| 1454 | kw_i2c_probe(); |
| 1455 | |
| 1456 | #ifdef CONFIG_ADB_PMU |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1457 | /* Probe PMU i2c busses */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1458 | pmu_i2c_probe(); |
| 1459 | #endif |
| 1460 | |
| 1461 | #ifdef CONFIG_PMAC_SMU |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1462 | /* Probe SMU i2c busses */ |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 1463 | smu_i2c_probe(); |
| 1464 | #endif |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1465 | |
| 1466 | /* Now add plaform functions for some known devices */ |
| 1467 | pmac_i2c_devscan(pmac_i2c_dev_create); |
| 1468 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1469 | return 0; |
| 1470 | } |
Grant Likely | d518b71 | 2008-01-03 06:14:28 +1100 | [diff] [blame] | 1471 | machine_arch_initcall(powermac, pmac_i2c_init); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1472 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1473 | /* Since pmac_i2c_init can be called too early for the platform device |
| 1474 | * registration, we need to do it at a later time. In our case, subsys |
| 1475 | * happens to fit well, though I agree it's a bit of a hack... |
| 1476 | */ |
| 1477 | static int __init pmac_i2c_create_platform_devices(void) |
| 1478 | { |
| 1479 | struct pmac_i2c_bus *bus; |
| 1480 | int i = 0; |
| 1481 | |
| 1482 | /* In the case where we are initialized from smp_init(), we must |
| 1483 | * not use the timer (and thus the irq). It's safe from now on |
| 1484 | * though |
| 1485 | */ |
| 1486 | pmac_i2c_force_poll = 0; |
| 1487 | |
| 1488 | /* Create platform devices */ |
| 1489 | list_for_each_entry(bus, &pmac_i2c_busses, link) { |
| 1490 | bus->platform_dev = |
| 1491 | platform_device_alloc("i2c-powermac", i++); |
| 1492 | if (bus->platform_dev == NULL) |
| 1493 | return -ENOMEM; |
| 1494 | bus->platform_dev->dev.platform_data = bus; |
| 1495 | platform_device_add(bus->platform_dev); |
| 1496 | } |
| 1497 | |
Benjamin Herrenschmidt | 5b9ca52 | 2006-01-07 11:41:02 +1100 | [diff] [blame] | 1498 | /* Now call platform "init" functions */ |
| 1499 | pmac_i2c_devscan(pmac_i2c_dev_init); |
| 1500 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 1501 | return 0; |
| 1502 | } |
Grant Likely | d518b71 | 2008-01-03 06:14:28 +1100 | [diff] [blame] | 1503 | machine_subsys_initcall(powermac, pmac_i2c_create_platform_devices); |