Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PowerMac G5 SMU driver |
| 3 | * |
| 4 | * Copyright 2004 J. Mayer <l_indien@magic.fr> |
| 5 | * Copyright 2005 Benjamin Herrenschmidt, IBM Corp. |
| 6 | * |
| 7 | * Released under the term of the GNU GPL v2. |
| 8 | */ |
| 9 | |
| 10 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * TODO: |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 12 | * - maybe add timeout to commands ? |
| 13 | * - blocking version of time functions |
| 14 | * - polling version of i2c commands (including timer that works with |
| 15 | * interrutps off) |
| 16 | * - maybe avoid some data copies with i2c by directly using the smu cmd |
| 17 | * buffer and a lower level internal interface |
| 18 | * - understand SMU -> CPU events and implement reception of them via |
| 19 | * the userland interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | */ |
| 21 | |
| 22 | #include <linux/config.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/device.h> |
| 26 | #include <linux/dmapool.h> |
| 27 | #include <linux/bootmem.h> |
| 28 | #include <linux/vmalloc.h> |
| 29 | #include <linux/highmem.h> |
| 30 | #include <linux/jiffies.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/rtc.h> |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 33 | #include <linux/completion.h> |
| 34 | #include <linux/miscdevice.h> |
| 35 | #include <linux/delay.h> |
| 36 | #include <linux/sysdev.h> |
| 37 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #include <asm/byteorder.h> |
| 40 | #include <asm/io.h> |
| 41 | #include <asm/prom.h> |
| 42 | #include <asm/machdep.h> |
| 43 | #include <asm/pmac_feature.h> |
| 44 | #include <asm/smu.h> |
| 45 | #include <asm/sections.h> |
| 46 | #include <asm/abs_addr.h> |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 47 | #include <asm/uaccess.h> |
| 48 | #include <asm/of_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 50 | #define VERSION "0.6" |
| 51 | #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp." |
| 52 | |
| 53 | #undef DEBUG_SMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | #ifdef DEBUG_SMU |
| 56 | #define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0) |
| 57 | #else |
| 58 | #define DPRINTK(fmt, args...) do { } while (0) |
| 59 | #endif |
| 60 | |
| 61 | /* |
| 62 | * This is the command buffer passed to the SMU hardware |
| 63 | */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 64 | #define SMU_MAX_DATA 254 |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | struct smu_cmd_buf { |
| 67 | u8 cmd; |
| 68 | u8 length; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 69 | u8 data[SMU_MAX_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | struct smu_device { |
| 73 | spinlock_t lock; |
| 74 | struct device_node *of_node; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 75 | struct of_device *of_dev; |
| 76 | int doorbell; /* doorbell gpio */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | u32 __iomem *db_buf; /* doorbell buffer */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 78 | int db_irq; |
| 79 | int msg; |
| 80 | int msg_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | struct smu_cmd_buf *cmd_buf; /* command buffer virtual */ |
| 82 | u32 cmd_buf_abs; /* command buffer absolute */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 83 | struct list_head cmd_list; |
| 84 | struct smu_cmd *cmd_cur; /* pending command */ |
| 85 | struct list_head cmd_i2c_list; |
| 86 | struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */ |
| 87 | struct timer_list i2c_timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | }; |
| 89 | |
| 90 | /* |
| 91 | * I don't think there will ever be more than one SMU, so |
| 92 | * for now, just hard code that |
| 93 | */ |
| 94 | static struct smu_device *smu; |
| 95 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | /* |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 98 | * SMU driver low level stuff |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 101 | static void smu_start_cmd(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 103 | unsigned long faddr, fend; |
| 104 | struct smu_cmd *cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 106 | if (list_empty(&smu->cmd_list)) |
| 107 | return; |
| 108 | |
| 109 | /* Fetch first command in queue */ |
| 110 | cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link); |
| 111 | smu->cmd_cur = cmd; |
| 112 | list_del(&cmd->link); |
| 113 | |
| 114 | DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd, |
| 115 | cmd->data_len); |
| 116 | DPRINTK("SMU: data buffer: %02x %02x %02x %02x ...\n", |
| 117 | ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1], |
| 118 | ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3]); |
| 119 | |
| 120 | /* Fill the SMU command buffer */ |
| 121 | smu->cmd_buf->cmd = cmd->cmd; |
| 122 | smu->cmd_buf->length = cmd->data_len; |
| 123 | memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len); |
| 124 | |
| 125 | /* Flush command and data to RAM */ |
| 126 | faddr = (unsigned long)smu->cmd_buf; |
| 127 | fend = faddr + smu->cmd_buf->length + 2; |
| 128 | flush_inval_dcache_range(faddr, fend); |
| 129 | |
| 130 | /* This isn't exactly a DMA mapping here, I suspect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | * the SMU is actually communicating with us via i2c to the |
| 132 | * northbridge or the CPU to access RAM. |
| 133 | */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 134 | writel(smu->cmd_buf_abs, smu->db_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
| 136 | /* Ring the SMU doorbell */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 137 | pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 140 | |
| 141 | static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 143 | unsigned long flags; |
| 144 | struct smu_cmd *cmd; |
| 145 | void (*done)(struct smu_cmd *cmd, void *misc) = NULL; |
| 146 | void *misc = NULL; |
| 147 | u8 gpio; |
| 148 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 150 | /* SMU completed the command, well, we hope, let's make sure |
| 151 | * of it |
| 152 | */ |
| 153 | spin_lock_irqsave(&smu->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 155 | gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell); |
Benjamin Herrenschmidt | a44fe13 | 2005-09-30 08:25:17 +1000 | [diff] [blame] | 156 | if ((gpio & 7) != 7) { |
| 157 | spin_unlock_irqrestore(&smu->lock, flags); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 158 | return IRQ_HANDLED; |
Benjamin Herrenschmidt | a44fe13 | 2005-09-30 08:25:17 +1000 | [diff] [blame] | 159 | } |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 160 | |
| 161 | cmd = smu->cmd_cur; |
| 162 | smu->cmd_cur = NULL; |
| 163 | if (cmd == NULL) |
| 164 | goto bail; |
| 165 | |
| 166 | if (rc == 0) { |
| 167 | unsigned long faddr; |
| 168 | int reply_len; |
| 169 | u8 ack; |
| 170 | |
| 171 | /* CPU might have brought back the cache line, so we need |
| 172 | * to flush again before peeking at the SMU response. We |
| 173 | * flush the entire buffer for now as we haven't read the |
| 174 | * reply lenght (it's only 2 cache lines anyway) |
| 175 | */ |
| 176 | faddr = (unsigned long)smu->cmd_buf; |
| 177 | flush_inval_dcache_range(faddr, faddr + 256); |
| 178 | |
| 179 | /* Now check ack */ |
| 180 | ack = (~cmd->cmd) & 0xff; |
| 181 | if (ack != smu->cmd_buf->cmd) { |
| 182 | DPRINTK("SMU: incorrect ack, want %x got %x\n", |
| 183 | ack, smu->cmd_buf->cmd); |
| 184 | rc = -EIO; |
| 185 | } |
| 186 | reply_len = rc == 0 ? smu->cmd_buf->length : 0; |
| 187 | DPRINTK("SMU: reply len: %d\n", reply_len); |
| 188 | if (reply_len > cmd->reply_len) { |
| 189 | printk(KERN_WARNING "SMU: reply buffer too small," |
| 190 | "got %d bytes for a %d bytes buffer\n", |
| 191 | reply_len, cmd->reply_len); |
| 192 | reply_len = cmd->reply_len; |
| 193 | } |
| 194 | cmd->reply_len = reply_len; |
| 195 | if (cmd->reply_buf && reply_len) |
| 196 | memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len); |
| 197 | } |
| 198 | |
| 199 | /* Now complete the command. Write status last in order as we lost |
| 200 | * ownership of the command structure as soon as it's no longer -1 |
| 201 | */ |
| 202 | done = cmd->done; |
| 203 | misc = cmd->misc; |
| 204 | mb(); |
| 205 | cmd->status = rc; |
| 206 | bail: |
| 207 | /* Start next command if any */ |
| 208 | smu_start_cmd(); |
| 209 | spin_unlock_irqrestore(&smu->lock, flags); |
| 210 | |
| 211 | /* Call command completion handler if any */ |
| 212 | if (done) |
| 213 | done(cmd, misc); |
| 214 | |
| 215 | /* It's an edge interrupt, nothing to do */ |
| 216 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 219 | |
| 220 | static irqreturn_t smu_msg_intr(int irq, void *arg, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 222 | /* I don't quite know what to do with this one, we seem to never |
| 223 | * receive it, so I suspect we have to arm it someway in the SMU |
| 224 | * to start getting events that way. |
| 225 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 227 | printk(KERN_INFO "SMU: message interrupt !\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 229 | /* It's an edge interrupt, nothing to do */ |
| 230 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 233 | |
| 234 | /* |
| 235 | * Queued command management. |
| 236 | * |
| 237 | */ |
| 238 | |
| 239 | int smu_queue_cmd(struct smu_cmd *cmd) |
| 240 | { |
| 241 | unsigned long flags; |
| 242 | |
| 243 | if (smu == NULL) |
| 244 | return -ENODEV; |
| 245 | if (cmd->data_len > SMU_MAX_DATA || |
| 246 | cmd->reply_len > SMU_MAX_DATA) |
| 247 | return -EINVAL; |
| 248 | |
| 249 | cmd->status = 1; |
| 250 | spin_lock_irqsave(&smu->lock, flags); |
| 251 | list_add_tail(&cmd->link, &smu->cmd_list); |
| 252 | if (smu->cmd_cur == NULL) |
| 253 | smu_start_cmd(); |
| 254 | spin_unlock_irqrestore(&smu->lock, flags); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | EXPORT_SYMBOL(smu_queue_cmd); |
| 259 | |
| 260 | |
| 261 | int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command, |
| 262 | unsigned int data_len, |
| 263 | void (*done)(struct smu_cmd *cmd, void *misc), |
| 264 | void *misc, ...) |
| 265 | { |
| 266 | struct smu_cmd *cmd = &scmd->cmd; |
| 267 | va_list list; |
| 268 | int i; |
| 269 | |
| 270 | if (data_len > sizeof(scmd->buffer)) |
| 271 | return -EINVAL; |
| 272 | |
| 273 | memset(scmd, 0, sizeof(*scmd)); |
| 274 | cmd->cmd = command; |
| 275 | cmd->data_len = data_len; |
| 276 | cmd->data_buf = scmd->buffer; |
| 277 | cmd->reply_len = sizeof(scmd->buffer); |
| 278 | cmd->reply_buf = scmd->buffer; |
| 279 | cmd->done = done; |
| 280 | cmd->misc = misc; |
| 281 | |
| 282 | va_start(list, misc); |
| 283 | for (i = 0; i < data_len; ++i) |
| 284 | scmd->buffer[i] = (u8)va_arg(list, int); |
| 285 | va_end(list); |
| 286 | |
| 287 | return smu_queue_cmd(cmd); |
| 288 | } |
| 289 | EXPORT_SYMBOL(smu_queue_simple); |
| 290 | |
| 291 | |
| 292 | void smu_poll(void) |
| 293 | { |
| 294 | u8 gpio; |
| 295 | |
| 296 | if (smu == NULL) |
| 297 | return; |
| 298 | |
| 299 | gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell); |
| 300 | if ((gpio & 7) == 7) |
| 301 | smu_db_intr(smu->db_irq, smu, NULL); |
| 302 | } |
| 303 | EXPORT_SYMBOL(smu_poll); |
| 304 | |
| 305 | |
| 306 | void smu_done_complete(struct smu_cmd *cmd, void *misc) |
| 307 | { |
| 308 | struct completion *comp = misc; |
| 309 | |
| 310 | complete(comp); |
| 311 | } |
| 312 | EXPORT_SYMBOL(smu_done_complete); |
| 313 | |
| 314 | |
| 315 | void smu_spinwait_cmd(struct smu_cmd *cmd) |
| 316 | { |
| 317 | while(cmd->status == 1) |
| 318 | smu_poll(); |
| 319 | } |
| 320 | EXPORT_SYMBOL(smu_spinwait_cmd); |
| 321 | |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | /* RTC low level commands */ |
| 324 | static inline int bcd2hex (int n) |
| 325 | { |
| 326 | return (((n & 0xf0) >> 4) * 10) + (n & 0xf); |
| 327 | } |
| 328 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | static inline int hex2bcd (int n) |
| 331 | { |
| 332 | return ((n / 10) << 4) + (n % 10); |
| 333 | } |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
| 336 | static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf, |
| 337 | struct rtc_time *time) |
| 338 | { |
| 339 | cmd_buf->cmd = 0x8e; |
| 340 | cmd_buf->length = 8; |
| 341 | cmd_buf->data[0] = 0x80; |
| 342 | cmd_buf->data[1] = hex2bcd(time->tm_sec); |
| 343 | cmd_buf->data[2] = hex2bcd(time->tm_min); |
| 344 | cmd_buf->data[3] = hex2bcd(time->tm_hour); |
| 345 | cmd_buf->data[4] = time->tm_wday; |
| 346 | cmd_buf->data[5] = hex2bcd(time->tm_mday); |
| 347 | cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1; |
| 348 | cmd_buf->data[7] = hex2bcd(time->tm_year - 100); |
| 349 | } |
| 350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 352 | int smu_get_rtc_time(struct rtc_time *time, int spinwait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 354 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | int rc; |
| 356 | |
| 357 | if (smu == NULL) |
| 358 | return -ENODEV; |
| 359 | |
| 360 | memset(time, 0, sizeof(struct rtc_time)); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 361 | rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL, |
| 362 | SMU_CMD_RTC_GET_DATETIME); |
| 363 | if (rc) |
| 364 | return rc; |
| 365 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 367 | time->tm_sec = bcd2hex(cmd.buffer[0]); |
| 368 | time->tm_min = bcd2hex(cmd.buffer[1]); |
| 369 | time->tm_hour = bcd2hex(cmd.buffer[2]); |
| 370 | time->tm_wday = bcd2hex(cmd.buffer[3]); |
| 371 | time->tm_mday = bcd2hex(cmd.buffer[4]); |
| 372 | time->tm_mon = bcd2hex(cmd.buffer[5]) - 1; |
| 373 | time->tm_year = bcd2hex(cmd.buffer[6]) + 100; |
| 374 | |
| 375 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 378 | |
| 379 | int smu_set_rtc_time(struct rtc_time *time, int spinwait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 381 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | int rc; |
| 383 | |
| 384 | if (smu == NULL) |
| 385 | return -ENODEV; |
| 386 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 387 | rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL, |
| 388 | SMU_CMD_RTC_SET_DATETIME, |
| 389 | hex2bcd(time->tm_sec), |
| 390 | hex2bcd(time->tm_min), |
| 391 | hex2bcd(time->tm_hour), |
| 392 | time->tm_wday, |
| 393 | hex2bcd(time->tm_mday), |
| 394 | hex2bcd(time->tm_mon) + 1, |
| 395 | hex2bcd(time->tm_year - 100)); |
| 396 | if (rc) |
| 397 | return rc; |
| 398 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 400 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | void smu_shutdown(void) |
| 405 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 406 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | if (smu == NULL) |
| 409 | return; |
| 410 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 411 | if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL, |
| 412 | 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0)) |
| 413 | return; |
| 414 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | for (;;) |
| 416 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | void smu_restart(void) |
| 421 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 422 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | if (smu == NULL) |
| 425 | return; |
| 426 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 427 | if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL, |
| 428 | 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0)) |
| 429 | return; |
| 430 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | for (;;) |
| 432 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
| 434 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | int smu_present(void) |
| 437 | { |
| 438 | return smu != NULL; |
| 439 | } |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 440 | EXPORT_SYMBOL(smu_present); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | |
| 443 | int smu_init (void) |
| 444 | { |
| 445 | struct device_node *np; |
| 446 | u32 *data; |
| 447 | |
| 448 | np = of_find_node_by_type(NULL, "smu"); |
| 449 | if (np == NULL) |
| 450 | return -ENODEV; |
| 451 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 452 | printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR); |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | if (smu_cmdbuf_abs == 0) { |
| 455 | printk(KERN_ERR "SMU: Command buffer not allocated !\n"); |
| 456 | return -EINVAL; |
| 457 | } |
| 458 | |
| 459 | smu = alloc_bootmem(sizeof(struct smu_device)); |
| 460 | if (smu == NULL) |
| 461 | return -ENOMEM; |
| 462 | memset(smu, 0, sizeof(*smu)); |
| 463 | |
| 464 | spin_lock_init(&smu->lock); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 465 | INIT_LIST_HEAD(&smu->cmd_list); |
| 466 | INIT_LIST_HEAD(&smu->cmd_i2c_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | smu->of_node = np; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 468 | smu->db_irq = NO_IRQ; |
| 469 | smu->msg_irq = NO_IRQ; |
| 470 | init_timer(&smu->i2c_timer); |
| 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a |
| 473 | * 32 bits value safely |
| 474 | */ |
| 475 | smu->cmd_buf_abs = (u32)smu_cmdbuf_abs; |
| 476 | smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs); |
| 477 | |
| 478 | np = of_find_node_by_name(NULL, "smu-doorbell"); |
| 479 | if (np == NULL) { |
| 480 | printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n"); |
| 481 | goto fail; |
| 482 | } |
| 483 | data = (u32 *)get_property(np, "reg", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | if (data == NULL) { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 485 | of_node_put(np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n"); |
| 487 | goto fail; |
| 488 | } |
| 489 | |
| 490 | /* Current setup has one doorbell GPIO that does both doorbell |
| 491 | * and ack. GPIOs are at 0x50, best would be to find that out |
| 492 | * in the device-tree though. |
| 493 | */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 494 | smu->doorbell = *data; |
| 495 | if (smu->doorbell < 0x50) |
| 496 | smu->doorbell += 0x50; |
| 497 | if (np->n_intrs > 0) |
| 498 | smu->db_irq = np->intrs[0].line; |
| 499 | |
| 500 | of_node_put(np); |
| 501 | |
| 502 | /* Now look for the smu-interrupt GPIO */ |
| 503 | do { |
| 504 | np = of_find_node_by_name(NULL, "smu-interrupt"); |
| 505 | if (np == NULL) |
| 506 | break; |
| 507 | data = (u32 *)get_property(np, "reg", NULL); |
| 508 | if (data == NULL) { |
| 509 | of_node_put(np); |
| 510 | break; |
| 511 | } |
| 512 | smu->msg = *data; |
| 513 | if (smu->msg < 0x50) |
| 514 | smu->msg += 0x50; |
| 515 | if (np->n_intrs > 0) |
| 516 | smu->msg_irq = np->intrs[0].line; |
| 517 | of_node_put(np); |
| 518 | } while(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | /* Doorbell buffer is currently hard-coded, I didn't find a proper |
| 521 | * device-tree entry giving the address. Best would probably to use |
| 522 | * an offset for K2 base though, but let's do it that way for now. |
| 523 | */ |
| 524 | smu->db_buf = ioremap(0x8000860c, 0x1000); |
| 525 | if (smu->db_buf == NULL) { |
| 526 | printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n"); |
| 527 | goto fail; |
| 528 | } |
| 529 | |
| 530 | sys_ctrler = SYS_CTRLER_SMU; |
| 531 | return 0; |
| 532 | |
| 533 | fail: |
| 534 | smu = NULL; |
| 535 | return -ENXIO; |
| 536 | |
| 537 | } |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 538 | |
| 539 | |
| 540 | static int smu_late_init(void) |
| 541 | { |
| 542 | if (!smu) |
| 543 | return 0; |
| 544 | |
| 545 | /* |
| 546 | * Try to request the interrupts |
| 547 | */ |
| 548 | |
| 549 | if (smu->db_irq != NO_IRQ) { |
| 550 | if (request_irq(smu->db_irq, smu_db_intr, |
| 551 | SA_SHIRQ, "SMU doorbell", smu) < 0) { |
| 552 | printk(KERN_WARNING "SMU: can't " |
| 553 | "request interrupt %d\n", |
| 554 | smu->db_irq); |
| 555 | smu->db_irq = NO_IRQ; |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | if (smu->msg_irq != NO_IRQ) { |
| 560 | if (request_irq(smu->msg_irq, smu_msg_intr, |
| 561 | SA_SHIRQ, "SMU message", smu) < 0) { |
| 562 | printk(KERN_WARNING "SMU: can't " |
| 563 | "request interrupt %d\n", |
| 564 | smu->msg_irq); |
| 565 | smu->msg_irq = NO_IRQ; |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | return 0; |
| 570 | } |
| 571 | arch_initcall(smu_late_init); |
| 572 | |
| 573 | /* |
| 574 | * sysfs visibility |
| 575 | */ |
| 576 | |
| 577 | static void smu_expose_childs(void *unused) |
| 578 | { |
| 579 | struct device_node *np; |
| 580 | |
| 581 | for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;) { |
| 582 | if (device_is_compatible(np, "smu-i2c")) { |
| 583 | char name[32]; |
| 584 | u32 *reg = (u32 *)get_property(np, "reg", NULL); |
| 585 | |
| 586 | if (reg == NULL) |
| 587 | continue; |
| 588 | sprintf(name, "smu-i2c-%02x", *reg); |
| 589 | of_platform_device_create(np, name, &smu->of_dev->dev); |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | } |
| 594 | |
| 595 | static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs, NULL); |
| 596 | |
| 597 | static int smu_platform_probe(struct of_device* dev, |
| 598 | const struct of_device_id *match) |
| 599 | { |
| 600 | if (!smu) |
| 601 | return -ENODEV; |
| 602 | smu->of_dev = dev; |
| 603 | |
| 604 | /* |
| 605 | * Ok, we are matched, now expose all i2c busses. We have to defer |
| 606 | * that unfortunately or it would deadlock inside the device model |
| 607 | */ |
| 608 | schedule_work(&smu_expose_childs_work); |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | static struct of_device_id smu_platform_match[] = |
| 614 | { |
| 615 | { |
| 616 | .type = "smu", |
| 617 | }, |
| 618 | {}, |
| 619 | }; |
| 620 | |
| 621 | static struct of_platform_driver smu_of_platform_driver = |
| 622 | { |
| 623 | .name = "smu", |
| 624 | .match_table = smu_platform_match, |
| 625 | .probe = smu_platform_probe, |
| 626 | }; |
| 627 | |
| 628 | static int __init smu_init_sysfs(void) |
| 629 | { |
| 630 | int rc; |
| 631 | |
| 632 | /* |
| 633 | * Due to sysfs bogosity, a sysdev is not a real device, so |
| 634 | * we should in fact create both if we want sysdev semantics |
| 635 | * for power management. |
| 636 | * For now, we don't power manage machines with an SMU chip, |
| 637 | * I'm a bit too far from figuring out how that works with those |
| 638 | * new chipsets, but that will come back and bite us |
| 639 | */ |
| 640 | rc = of_register_driver(&smu_of_platform_driver); |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | device_initcall(smu_init_sysfs); |
| 645 | |
| 646 | struct of_device *smu_get_ofdev(void) |
| 647 | { |
| 648 | if (!smu) |
| 649 | return NULL; |
| 650 | return smu->of_dev; |
| 651 | } |
| 652 | |
| 653 | EXPORT_SYMBOL_GPL(smu_get_ofdev); |
| 654 | |
| 655 | /* |
| 656 | * i2c interface |
| 657 | */ |
| 658 | |
| 659 | static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail) |
| 660 | { |
| 661 | void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done; |
| 662 | void *misc = cmd->misc; |
| 663 | unsigned long flags; |
| 664 | |
| 665 | /* Check for read case */ |
| 666 | if (!fail && cmd->read) { |
| 667 | if (cmd->pdata[0] < 1) |
| 668 | fail = 1; |
| 669 | else |
| 670 | memcpy(cmd->info.data, &cmd->pdata[1], |
| 671 | cmd->info.datalen); |
| 672 | } |
| 673 | |
| 674 | DPRINTK("SMU: completing, success: %d\n", !fail); |
| 675 | |
| 676 | /* Update status and mark no pending i2c command with lock |
| 677 | * held so nobody comes in while we dequeue an eventual |
| 678 | * pending next i2c command |
| 679 | */ |
| 680 | spin_lock_irqsave(&smu->lock, flags); |
| 681 | smu->cmd_i2c_cur = NULL; |
| 682 | wmb(); |
| 683 | cmd->status = fail ? -EIO : 0; |
| 684 | |
| 685 | /* Is there another i2c command waiting ? */ |
| 686 | if (!list_empty(&smu->cmd_i2c_list)) { |
| 687 | struct smu_i2c_cmd *newcmd; |
| 688 | |
| 689 | /* Fetch it, new current, remove from list */ |
| 690 | newcmd = list_entry(smu->cmd_i2c_list.next, |
| 691 | struct smu_i2c_cmd, link); |
| 692 | smu->cmd_i2c_cur = newcmd; |
| 693 | list_del(&cmd->link); |
| 694 | |
| 695 | /* Queue with low level smu */ |
| 696 | list_add_tail(&cmd->scmd.link, &smu->cmd_list); |
| 697 | if (smu->cmd_cur == NULL) |
| 698 | smu_start_cmd(); |
| 699 | } |
| 700 | spin_unlock_irqrestore(&smu->lock, flags); |
| 701 | |
| 702 | /* Call command completion handler if any */ |
| 703 | if (done) |
| 704 | done(cmd, misc); |
| 705 | |
| 706 | } |
| 707 | |
| 708 | |
| 709 | static void smu_i2c_retry(unsigned long data) |
| 710 | { |
| 711 | struct smu_i2c_cmd *cmd = (struct smu_i2c_cmd *)data; |
| 712 | |
| 713 | DPRINTK("SMU: i2c failure, requeuing...\n"); |
| 714 | |
| 715 | /* requeue command simply by resetting reply_len */ |
| 716 | cmd->pdata[0] = 0xff; |
| 717 | cmd->scmd.reply_len = 0x10; |
| 718 | smu_queue_cmd(&cmd->scmd); |
| 719 | } |
| 720 | |
| 721 | |
| 722 | static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc) |
| 723 | { |
| 724 | struct smu_i2c_cmd *cmd = misc; |
| 725 | int fail = 0; |
| 726 | |
| 727 | DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n", |
| 728 | cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len); |
| 729 | |
| 730 | /* Check for possible status */ |
| 731 | if (scmd->status < 0) |
| 732 | fail = 1; |
| 733 | else if (cmd->read) { |
| 734 | if (cmd->stage == 0) |
| 735 | fail = cmd->pdata[0] != 0; |
| 736 | else |
| 737 | fail = cmd->pdata[0] >= 0x80; |
| 738 | } else { |
| 739 | fail = cmd->pdata[0] != 0; |
| 740 | } |
| 741 | |
| 742 | /* Handle failures by requeuing command, after 5ms interval |
| 743 | */ |
| 744 | if (fail && --cmd->retries > 0) { |
| 745 | DPRINTK("SMU: i2c failure, starting timer...\n"); |
| 746 | smu->i2c_timer.function = smu_i2c_retry; |
| 747 | smu->i2c_timer.data = (unsigned long)cmd; |
| 748 | smu->i2c_timer.expires = jiffies + msecs_to_jiffies(5); |
| 749 | add_timer(&smu->i2c_timer); |
| 750 | return; |
| 751 | } |
| 752 | |
| 753 | /* If failure or stage 1, command is complete */ |
| 754 | if (fail || cmd->stage != 0) { |
| 755 | smu_i2c_complete_command(cmd, fail); |
| 756 | return; |
| 757 | } |
| 758 | |
| 759 | DPRINTK("SMU: going to stage 1\n"); |
| 760 | |
| 761 | /* Ok, initial command complete, now poll status */ |
| 762 | scmd->reply_buf = cmd->pdata; |
| 763 | scmd->reply_len = 0x10; |
| 764 | scmd->data_buf = cmd->pdata; |
| 765 | scmd->data_len = 1; |
| 766 | cmd->pdata[0] = 0; |
| 767 | cmd->stage = 1; |
| 768 | cmd->retries = 20; |
| 769 | smu_queue_cmd(scmd); |
| 770 | } |
| 771 | |
| 772 | |
| 773 | int smu_queue_i2c(struct smu_i2c_cmd *cmd) |
| 774 | { |
| 775 | unsigned long flags; |
| 776 | |
| 777 | if (smu == NULL) |
| 778 | return -ENODEV; |
| 779 | |
| 780 | /* Fill most fields of scmd */ |
| 781 | cmd->scmd.cmd = SMU_CMD_I2C_COMMAND; |
| 782 | cmd->scmd.done = smu_i2c_low_completion; |
| 783 | cmd->scmd.misc = cmd; |
| 784 | cmd->scmd.reply_buf = cmd->pdata; |
| 785 | cmd->scmd.reply_len = 0x10; |
| 786 | cmd->scmd.data_buf = (u8 *)(char *)&cmd->info; |
| 787 | cmd->scmd.status = 1; |
| 788 | cmd->stage = 0; |
| 789 | cmd->pdata[0] = 0xff; |
| 790 | cmd->retries = 20; |
| 791 | cmd->status = 1; |
| 792 | |
| 793 | /* Check transfer type, sanitize some "info" fields |
| 794 | * based on transfer type and do more checking |
| 795 | */ |
| 796 | cmd->info.caddr = cmd->info.devaddr; |
| 797 | cmd->read = cmd->info.devaddr & 0x01; |
| 798 | switch(cmd->info.type) { |
| 799 | case SMU_I2C_TRANSFER_SIMPLE: |
| 800 | memset(&cmd->info.sublen, 0, 4); |
| 801 | break; |
| 802 | case SMU_I2C_TRANSFER_COMBINED: |
| 803 | cmd->info.devaddr &= 0xfe; |
| 804 | case SMU_I2C_TRANSFER_STDSUB: |
| 805 | if (cmd->info.sublen > 3) |
| 806 | return -EINVAL; |
| 807 | break; |
| 808 | default: |
| 809 | return -EINVAL; |
| 810 | } |
| 811 | |
| 812 | /* Finish setting up command based on transfer direction |
| 813 | */ |
| 814 | if (cmd->read) { |
| 815 | if (cmd->info.datalen > SMU_I2C_READ_MAX) |
| 816 | return -EINVAL; |
| 817 | memset(cmd->info.data, 0xff, cmd->info.datalen); |
| 818 | cmd->scmd.data_len = 9; |
| 819 | } else { |
| 820 | if (cmd->info.datalen > SMU_I2C_WRITE_MAX) |
| 821 | return -EINVAL; |
| 822 | cmd->scmd.data_len = 9 + cmd->info.datalen; |
| 823 | } |
| 824 | |
| 825 | DPRINTK("SMU: i2c enqueuing command\n"); |
| 826 | DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n", |
| 827 | cmd->read ? "read" : "write", cmd->info.datalen, |
| 828 | cmd->info.bus, cmd->info.caddr, |
| 829 | cmd->info.subaddr[0], cmd->info.type); |
| 830 | |
| 831 | |
| 832 | /* Enqueue command in i2c list, and if empty, enqueue also in |
| 833 | * main command list |
| 834 | */ |
| 835 | spin_lock_irqsave(&smu->lock, flags); |
| 836 | if (smu->cmd_i2c_cur == NULL) { |
| 837 | smu->cmd_i2c_cur = cmd; |
| 838 | list_add_tail(&cmd->scmd.link, &smu->cmd_list); |
| 839 | if (smu->cmd_cur == NULL) |
| 840 | smu_start_cmd(); |
| 841 | } else |
| 842 | list_add_tail(&cmd->link, &smu->cmd_i2c_list); |
| 843 | spin_unlock_irqrestore(&smu->lock, flags); |
| 844 | |
| 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | |
| 849 | |
| 850 | /* |
| 851 | * Userland driver interface |
| 852 | */ |
| 853 | |
| 854 | |
| 855 | static LIST_HEAD(smu_clist); |
| 856 | static DEFINE_SPINLOCK(smu_clist_lock); |
| 857 | |
| 858 | enum smu_file_mode { |
| 859 | smu_file_commands, |
| 860 | smu_file_events, |
| 861 | smu_file_closing |
| 862 | }; |
| 863 | |
| 864 | struct smu_private |
| 865 | { |
| 866 | struct list_head list; |
| 867 | enum smu_file_mode mode; |
| 868 | int busy; |
| 869 | struct smu_cmd cmd; |
| 870 | spinlock_t lock; |
| 871 | wait_queue_head_t wait; |
| 872 | u8 buffer[SMU_MAX_DATA]; |
| 873 | }; |
| 874 | |
| 875 | |
| 876 | static int smu_open(struct inode *inode, struct file *file) |
| 877 | { |
| 878 | struct smu_private *pp; |
| 879 | unsigned long flags; |
| 880 | |
| 881 | pp = kmalloc(sizeof(struct smu_private), GFP_KERNEL); |
| 882 | if (pp == 0) |
| 883 | return -ENOMEM; |
| 884 | memset(pp, 0, sizeof(struct smu_private)); |
| 885 | spin_lock_init(&pp->lock); |
| 886 | pp->mode = smu_file_commands; |
| 887 | init_waitqueue_head(&pp->wait); |
| 888 | |
| 889 | spin_lock_irqsave(&smu_clist_lock, flags); |
| 890 | list_add(&pp->list, &smu_clist); |
| 891 | spin_unlock_irqrestore(&smu_clist_lock, flags); |
| 892 | file->private_data = pp; |
| 893 | |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | |
| 898 | static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc) |
| 899 | { |
| 900 | struct smu_private *pp = misc; |
| 901 | |
| 902 | wake_up_all(&pp->wait); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | static ssize_t smu_write(struct file *file, const char __user *buf, |
| 907 | size_t count, loff_t *ppos) |
| 908 | { |
| 909 | struct smu_private *pp = file->private_data; |
| 910 | unsigned long flags; |
| 911 | struct smu_user_cmd_hdr hdr; |
| 912 | int rc = 0; |
| 913 | |
| 914 | if (pp->busy) |
| 915 | return -EBUSY; |
| 916 | else if (copy_from_user(&hdr, buf, sizeof(hdr))) |
| 917 | return -EFAULT; |
| 918 | else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) { |
| 919 | pp->mode = smu_file_events; |
| 920 | return 0; |
| 921 | } else if (hdr.cmdtype != SMU_CMDTYPE_SMU) |
| 922 | return -EINVAL; |
| 923 | else if (pp->mode != smu_file_commands) |
| 924 | return -EBADFD; |
| 925 | else if (hdr.data_len > SMU_MAX_DATA) |
| 926 | return -EINVAL; |
| 927 | |
| 928 | spin_lock_irqsave(&pp->lock, flags); |
| 929 | if (pp->busy) { |
| 930 | spin_unlock_irqrestore(&pp->lock, flags); |
| 931 | return -EBUSY; |
| 932 | } |
| 933 | pp->busy = 1; |
| 934 | pp->cmd.status = 1; |
| 935 | spin_unlock_irqrestore(&pp->lock, flags); |
| 936 | |
| 937 | if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) { |
| 938 | pp->busy = 0; |
| 939 | return -EFAULT; |
| 940 | } |
| 941 | |
| 942 | pp->cmd.cmd = hdr.cmd; |
| 943 | pp->cmd.data_len = hdr.data_len; |
| 944 | pp->cmd.reply_len = SMU_MAX_DATA; |
| 945 | pp->cmd.data_buf = pp->buffer; |
| 946 | pp->cmd.reply_buf = pp->buffer; |
| 947 | pp->cmd.done = smu_user_cmd_done; |
| 948 | pp->cmd.misc = pp; |
| 949 | rc = smu_queue_cmd(&pp->cmd); |
| 950 | if (rc < 0) |
| 951 | return rc; |
| 952 | return count; |
| 953 | } |
| 954 | |
| 955 | |
| 956 | static ssize_t smu_read_command(struct file *file, struct smu_private *pp, |
| 957 | char __user *buf, size_t count) |
| 958 | { |
| 959 | DECLARE_WAITQUEUE(wait, current); |
| 960 | struct smu_user_reply_hdr hdr; |
| 961 | unsigned long flags; |
| 962 | int size, rc = 0; |
| 963 | |
| 964 | if (!pp->busy) |
| 965 | return 0; |
| 966 | if (count < sizeof(struct smu_user_reply_hdr)) |
| 967 | return -EOVERFLOW; |
| 968 | spin_lock_irqsave(&pp->lock, flags); |
| 969 | if (pp->cmd.status == 1) { |
| 970 | if (file->f_flags & O_NONBLOCK) |
| 971 | return -EAGAIN; |
| 972 | add_wait_queue(&pp->wait, &wait); |
| 973 | for (;;) { |
| 974 | set_current_state(TASK_INTERRUPTIBLE); |
| 975 | rc = 0; |
| 976 | if (pp->cmd.status != 1) |
| 977 | break; |
| 978 | rc = -ERESTARTSYS; |
| 979 | if (signal_pending(current)) |
| 980 | break; |
| 981 | spin_unlock_irqrestore(&pp->lock, flags); |
| 982 | schedule(); |
| 983 | spin_lock_irqsave(&pp->lock, flags); |
| 984 | } |
| 985 | set_current_state(TASK_RUNNING); |
| 986 | remove_wait_queue(&pp->wait, &wait); |
| 987 | } |
| 988 | spin_unlock_irqrestore(&pp->lock, flags); |
| 989 | if (rc) |
| 990 | return rc; |
| 991 | if (pp->cmd.status != 0) |
| 992 | pp->cmd.reply_len = 0; |
| 993 | size = sizeof(hdr) + pp->cmd.reply_len; |
| 994 | if (count < size) |
| 995 | size = count; |
| 996 | rc = size; |
| 997 | hdr.status = pp->cmd.status; |
| 998 | hdr.reply_len = pp->cmd.reply_len; |
| 999 | if (copy_to_user(buf, &hdr, sizeof(hdr))) |
| 1000 | return -EFAULT; |
| 1001 | size -= sizeof(hdr); |
| 1002 | if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size)) |
| 1003 | return -EFAULT; |
| 1004 | pp->busy = 0; |
| 1005 | |
| 1006 | return rc; |
| 1007 | } |
| 1008 | |
| 1009 | |
| 1010 | static ssize_t smu_read_events(struct file *file, struct smu_private *pp, |
| 1011 | char __user *buf, size_t count) |
| 1012 | { |
| 1013 | /* Not implemented */ |
| 1014 | msleep_interruptible(1000); |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | static ssize_t smu_read(struct file *file, char __user *buf, |
| 1020 | size_t count, loff_t *ppos) |
| 1021 | { |
| 1022 | struct smu_private *pp = file->private_data; |
| 1023 | |
| 1024 | if (pp->mode == smu_file_commands) |
| 1025 | return smu_read_command(file, pp, buf, count); |
| 1026 | if (pp->mode == smu_file_events) |
| 1027 | return smu_read_events(file, pp, buf, count); |
| 1028 | |
| 1029 | return -EBADFD; |
| 1030 | } |
| 1031 | |
| 1032 | static unsigned int smu_fpoll(struct file *file, poll_table *wait) |
| 1033 | { |
| 1034 | struct smu_private *pp = file->private_data; |
| 1035 | unsigned int mask = 0; |
| 1036 | unsigned long flags; |
| 1037 | |
| 1038 | if (pp == 0) |
| 1039 | return 0; |
| 1040 | |
| 1041 | if (pp->mode == smu_file_commands) { |
| 1042 | poll_wait(file, &pp->wait, wait); |
| 1043 | |
| 1044 | spin_lock_irqsave(&pp->lock, flags); |
| 1045 | if (pp->busy && pp->cmd.status != 1) |
| 1046 | mask |= POLLIN; |
| 1047 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1048 | } if (pp->mode == smu_file_events) { |
| 1049 | /* Not yet implemented */ |
| 1050 | } |
| 1051 | return mask; |
| 1052 | } |
| 1053 | |
| 1054 | static int smu_release(struct inode *inode, struct file *file) |
| 1055 | { |
| 1056 | struct smu_private *pp = file->private_data; |
| 1057 | unsigned long flags; |
| 1058 | unsigned int busy; |
| 1059 | |
| 1060 | if (pp == 0) |
| 1061 | return 0; |
| 1062 | |
| 1063 | file->private_data = NULL; |
| 1064 | |
| 1065 | /* Mark file as closing to avoid races with new request */ |
| 1066 | spin_lock_irqsave(&pp->lock, flags); |
| 1067 | pp->mode = smu_file_closing; |
| 1068 | busy = pp->busy; |
| 1069 | |
| 1070 | /* Wait for any pending request to complete */ |
| 1071 | if (busy && pp->cmd.status == 1) { |
| 1072 | DECLARE_WAITQUEUE(wait, current); |
| 1073 | |
| 1074 | add_wait_queue(&pp->wait, &wait); |
| 1075 | for (;;) { |
| 1076 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 1077 | if (pp->cmd.status != 1) |
| 1078 | break; |
| 1079 | spin_lock_irqsave(&pp->lock, flags); |
| 1080 | schedule(); |
| 1081 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1082 | } |
| 1083 | set_current_state(TASK_RUNNING); |
| 1084 | remove_wait_queue(&pp->wait, &wait); |
| 1085 | } |
| 1086 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1087 | |
| 1088 | spin_lock_irqsave(&smu_clist_lock, flags); |
| 1089 | list_del(&pp->list); |
| 1090 | spin_unlock_irqrestore(&smu_clist_lock, flags); |
| 1091 | kfree(pp); |
| 1092 | |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
| 1096 | |
| 1097 | static struct file_operations smu_device_fops __pmacdata = { |
| 1098 | .llseek = no_llseek, |
| 1099 | .read = smu_read, |
| 1100 | .write = smu_write, |
| 1101 | .poll = smu_fpoll, |
| 1102 | .open = smu_open, |
| 1103 | .release = smu_release, |
| 1104 | }; |
| 1105 | |
| 1106 | static struct miscdevice pmu_device __pmacdata = { |
| 1107 | MISC_DYNAMIC_MINOR, "smu", &smu_device_fops |
| 1108 | }; |
| 1109 | |
| 1110 | static int smu_device_init(void) |
| 1111 | { |
| 1112 | if (!smu) |
| 1113 | return -ENODEV; |
| 1114 | if (misc_register(&pmu_device) < 0) |
| 1115 | printk(KERN_ERR "via-pmu: cannot register misc device.\n"); |
| 1116 | return 0; |
| 1117 | } |
| 1118 | device_initcall(smu_device_init); |