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 |
Joe Perches | f18816b | 2008-02-03 17:18:02 +0200 | [diff] [blame] | 15 | * interrupts off) |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 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 | |
Arnd Bergmann | b9bde77 | 2008-05-20 19:16:11 +0200 | [diff] [blame] | 22 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 38 | #include <linux/mutex.h> |
Stephen Rothwell | ad9e05a | 2008-05-23 16:27:02 +1000 | [diff] [blame] | 39 | #include <linux/of_device.h> |
| 40 | #include <linux/of_platform.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #include <asm/byteorder.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/prom.h> |
| 46 | #include <asm/machdep.h> |
| 47 | #include <asm/pmac_feature.h> |
| 48 | #include <asm/smu.h> |
| 49 | #include <asm/sections.h> |
| 50 | #include <asm/abs_addr.h> |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 51 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 53 | #define VERSION "0.7" |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 54 | #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp." |
| 55 | |
| 56 | #undef DEBUG_SMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | #ifdef DEBUG_SMU |
Benjamin Herrenschmidt | 1beb6a7 | 2005-12-14 13:10:10 +1100 | [diff] [blame] | 59 | #define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #else |
| 61 | #define DPRINTK(fmt, args...) do { } while (0) |
| 62 | #endif |
| 63 | |
| 64 | /* |
| 65 | * This is the command buffer passed to the SMU hardware |
| 66 | */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 67 | #define SMU_MAX_DATA 254 |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | struct smu_cmd_buf { |
| 70 | u8 cmd; |
| 71 | u8 length; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 72 | u8 data[SMU_MAX_DATA]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | }; |
| 74 | |
| 75 | struct smu_device { |
| 76 | spinlock_t lock; |
| 77 | struct device_node *of_node; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 78 | struct of_device *of_dev; |
| 79 | int doorbell; /* doorbell gpio */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | u32 __iomem *db_buf; /* doorbell buffer */ |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 81 | struct device_node *db_node; |
| 82 | unsigned int db_irq; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 83 | int msg; |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 84 | struct device_node *msg_node; |
| 85 | unsigned int msg_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | struct smu_cmd_buf *cmd_buf; /* command buffer virtual */ |
| 87 | u32 cmd_buf_abs; /* command buffer absolute */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 88 | struct list_head cmd_list; |
| 89 | struct smu_cmd *cmd_cur; /* pending command */ |
Benjamin Herrenschmidt | 592a607 | 2008-02-07 14:29:43 +1100 | [diff] [blame] | 90 | int broken_nap; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 91 | struct list_head cmd_i2c_list; |
| 92 | struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */ |
| 93 | struct timer_list i2c_timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | /* |
| 97 | * I don't think there will ever be more than one SMU, so |
| 98 | * for now, just hard code that |
| 99 | */ |
| 100 | static struct smu_device *smu; |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 101 | static DEFINE_MUTEX(smu_part_access); |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 102 | static int smu_irq_inited; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 103 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 104 | static void smu_i2c_retry(unsigned long data); |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | /* |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 107 | * SMU driver low level stuff |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 110 | static void smu_start_cmd(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 112 | unsigned long faddr, fend; |
| 113 | struct smu_cmd *cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 115 | if (list_empty(&smu->cmd_list)) |
| 116 | return; |
| 117 | |
| 118 | /* Fetch first command in queue */ |
| 119 | cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link); |
| 120 | smu->cmd_cur = cmd; |
| 121 | list_del(&cmd->link); |
| 122 | |
| 123 | DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd, |
| 124 | cmd->data_len); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 125 | DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n", |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 126 | ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1], |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 127 | ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3], |
| 128 | ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5], |
| 129 | ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 130 | |
| 131 | /* Fill the SMU command buffer */ |
| 132 | smu->cmd_buf->cmd = cmd->cmd; |
| 133 | smu->cmd_buf->length = cmd->data_len; |
| 134 | memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len); |
| 135 | |
| 136 | /* Flush command and data to RAM */ |
| 137 | faddr = (unsigned long)smu->cmd_buf; |
| 138 | fend = faddr + smu->cmd_buf->length + 2; |
| 139 | flush_inval_dcache_range(faddr, fend); |
| 140 | |
Benjamin Herrenschmidt | 592a607 | 2008-02-07 14:29:43 +1100 | [diff] [blame] | 141 | |
| 142 | /* We also disable NAP mode for the duration of the command |
| 143 | * on U3 based machines. |
| 144 | * This is slightly racy as it can be written back to 1 by a sysctl |
| 145 | * but that never happens in practice. There seem to be an issue with |
| 146 | * U3 based machines such as the iMac G5 where napping for the |
| 147 | * whole duration of the command prevents the SMU from fetching it |
| 148 | * from memory. This might be related to the strange i2c based |
| 149 | * mechanism the SMU uses to access memory. |
| 150 | */ |
| 151 | if (smu->broken_nap) |
| 152 | powersave_nap = 0; |
| 153 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 154 | /* This isn't exactly a DMA mapping here, I suspect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * the SMU is actually communicating with us via i2c to the |
| 156 | * northbridge or the CPU to access RAM. |
| 157 | */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 158 | writel(smu->cmd_buf_abs, smu->db_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | /* Ring the SMU doorbell */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 161 | pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 164 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 165 | static irqreturn_t smu_db_intr(int irq, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 167 | unsigned long flags; |
| 168 | struct smu_cmd *cmd; |
| 169 | void (*done)(struct smu_cmd *cmd, void *misc) = NULL; |
| 170 | void *misc = NULL; |
| 171 | u8 gpio; |
| 172 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 174 | /* SMU completed the command, well, we hope, let's make sure |
| 175 | * of it |
| 176 | */ |
| 177 | spin_lock_irqsave(&smu->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 179 | gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell); |
Benjamin Herrenschmidt | a44fe13 | 2005-09-30 08:25:17 +1000 | [diff] [blame] | 180 | if ((gpio & 7) != 7) { |
| 181 | spin_unlock_irqrestore(&smu->lock, flags); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 182 | return IRQ_HANDLED; |
Benjamin Herrenschmidt | a44fe13 | 2005-09-30 08:25:17 +1000 | [diff] [blame] | 183 | } |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 184 | |
| 185 | cmd = smu->cmd_cur; |
| 186 | smu->cmd_cur = NULL; |
| 187 | if (cmd == NULL) |
| 188 | goto bail; |
| 189 | |
| 190 | if (rc == 0) { |
| 191 | unsigned long faddr; |
| 192 | int reply_len; |
| 193 | u8 ack; |
| 194 | |
| 195 | /* CPU might have brought back the cache line, so we need |
| 196 | * to flush again before peeking at the SMU response. We |
| 197 | * flush the entire buffer for now as we haven't read the |
Paulius Zaleckas | efad798b | 2008-02-03 15:42:53 +0200 | [diff] [blame] | 198 | * reply length (it's only 2 cache lines anyway) |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 199 | */ |
| 200 | faddr = (unsigned long)smu->cmd_buf; |
| 201 | flush_inval_dcache_range(faddr, faddr + 256); |
| 202 | |
| 203 | /* Now check ack */ |
| 204 | ack = (~cmd->cmd) & 0xff; |
| 205 | if (ack != smu->cmd_buf->cmd) { |
| 206 | DPRINTK("SMU: incorrect ack, want %x got %x\n", |
| 207 | ack, smu->cmd_buf->cmd); |
| 208 | rc = -EIO; |
| 209 | } |
| 210 | reply_len = rc == 0 ? smu->cmd_buf->length : 0; |
| 211 | DPRINTK("SMU: reply len: %d\n", reply_len); |
| 212 | if (reply_len > cmd->reply_len) { |
| 213 | printk(KERN_WARNING "SMU: reply buffer too small," |
| 214 | "got %d bytes for a %d bytes buffer\n", |
| 215 | reply_len, cmd->reply_len); |
| 216 | reply_len = cmd->reply_len; |
| 217 | } |
| 218 | cmd->reply_len = reply_len; |
| 219 | if (cmd->reply_buf && reply_len) |
| 220 | memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len); |
| 221 | } |
| 222 | |
| 223 | /* Now complete the command. Write status last in order as we lost |
| 224 | * ownership of the command structure as soon as it's no longer -1 |
| 225 | */ |
| 226 | done = cmd->done; |
| 227 | misc = cmd->misc; |
| 228 | mb(); |
| 229 | cmd->status = rc; |
Benjamin Herrenschmidt | 592a607 | 2008-02-07 14:29:43 +1100 | [diff] [blame] | 230 | |
| 231 | /* Re-enable NAP mode */ |
| 232 | if (smu->broken_nap) |
| 233 | powersave_nap = 1; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 234 | bail: |
| 235 | /* Start next command if any */ |
| 236 | smu_start_cmd(); |
| 237 | spin_unlock_irqrestore(&smu->lock, flags); |
| 238 | |
| 239 | /* Call command completion handler if any */ |
| 240 | if (done) |
| 241 | done(cmd, misc); |
| 242 | |
| 243 | /* It's an edge interrupt, nothing to do */ |
| 244 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 247 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 248 | static irqreturn_t smu_msg_intr(int irq, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 250 | /* I don't quite know what to do with this one, we seem to never |
| 251 | * receive it, so I suspect we have to arm it someway in the SMU |
| 252 | * to start getting events that way. |
| 253 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 255 | printk(KERN_INFO "SMU: message interrupt !\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 257 | /* It's an edge interrupt, nothing to do */ |
| 258 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
| 260 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 261 | |
| 262 | /* |
| 263 | * Queued command management. |
| 264 | * |
| 265 | */ |
| 266 | |
| 267 | int smu_queue_cmd(struct smu_cmd *cmd) |
| 268 | { |
| 269 | unsigned long flags; |
| 270 | |
| 271 | if (smu == NULL) |
| 272 | return -ENODEV; |
| 273 | if (cmd->data_len > SMU_MAX_DATA || |
| 274 | cmd->reply_len > SMU_MAX_DATA) |
| 275 | return -EINVAL; |
| 276 | |
| 277 | cmd->status = 1; |
| 278 | spin_lock_irqsave(&smu->lock, flags); |
| 279 | list_add_tail(&cmd->link, &smu->cmd_list); |
| 280 | if (smu->cmd_cur == NULL) |
| 281 | smu_start_cmd(); |
| 282 | spin_unlock_irqrestore(&smu->lock, flags); |
| 283 | |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 284 | /* Workaround for early calls when irq isn't available */ |
| 285 | if (!smu_irq_inited || smu->db_irq == NO_IRQ) |
| 286 | smu_spinwait_cmd(cmd); |
| 287 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 288 | return 0; |
| 289 | } |
| 290 | EXPORT_SYMBOL(smu_queue_cmd); |
| 291 | |
| 292 | |
| 293 | int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command, |
| 294 | unsigned int data_len, |
| 295 | void (*done)(struct smu_cmd *cmd, void *misc), |
| 296 | void *misc, ...) |
| 297 | { |
| 298 | struct smu_cmd *cmd = &scmd->cmd; |
| 299 | va_list list; |
| 300 | int i; |
| 301 | |
| 302 | if (data_len > sizeof(scmd->buffer)) |
| 303 | return -EINVAL; |
| 304 | |
| 305 | memset(scmd, 0, sizeof(*scmd)); |
| 306 | cmd->cmd = command; |
| 307 | cmd->data_len = data_len; |
| 308 | cmd->data_buf = scmd->buffer; |
| 309 | cmd->reply_len = sizeof(scmd->buffer); |
| 310 | cmd->reply_buf = scmd->buffer; |
| 311 | cmd->done = done; |
| 312 | cmd->misc = misc; |
| 313 | |
| 314 | va_start(list, misc); |
| 315 | for (i = 0; i < data_len; ++i) |
| 316 | scmd->buffer[i] = (u8)va_arg(list, int); |
| 317 | va_end(list); |
| 318 | |
| 319 | return smu_queue_cmd(cmd); |
| 320 | } |
| 321 | EXPORT_SYMBOL(smu_queue_simple); |
| 322 | |
| 323 | |
| 324 | void smu_poll(void) |
| 325 | { |
| 326 | u8 gpio; |
| 327 | |
| 328 | if (smu == NULL) |
| 329 | return; |
| 330 | |
| 331 | gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell); |
| 332 | if ((gpio & 7) == 7) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 333 | smu_db_intr(smu->db_irq, smu); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 334 | } |
| 335 | EXPORT_SYMBOL(smu_poll); |
| 336 | |
| 337 | |
| 338 | void smu_done_complete(struct smu_cmd *cmd, void *misc) |
| 339 | { |
| 340 | struct completion *comp = misc; |
| 341 | |
| 342 | complete(comp); |
| 343 | } |
| 344 | EXPORT_SYMBOL(smu_done_complete); |
| 345 | |
| 346 | |
| 347 | void smu_spinwait_cmd(struct smu_cmd *cmd) |
| 348 | { |
| 349 | while(cmd->status == 1) |
| 350 | smu_poll(); |
| 351 | } |
| 352 | EXPORT_SYMBOL(smu_spinwait_cmd); |
| 353 | |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | /* RTC low level commands */ |
| 356 | static inline int bcd2hex (int n) |
| 357 | { |
| 358 | return (((n & 0xf0) >> 4) * 10) + (n & 0xf); |
| 359 | } |
| 360 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | static inline int hex2bcd (int n) |
| 363 | { |
| 364 | return ((n / 10) << 4) + (n % 10); |
| 365 | } |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf, |
| 369 | struct rtc_time *time) |
| 370 | { |
| 371 | cmd_buf->cmd = 0x8e; |
| 372 | cmd_buf->length = 8; |
| 373 | cmd_buf->data[0] = 0x80; |
| 374 | cmd_buf->data[1] = hex2bcd(time->tm_sec); |
| 375 | cmd_buf->data[2] = hex2bcd(time->tm_min); |
| 376 | cmd_buf->data[3] = hex2bcd(time->tm_hour); |
| 377 | cmd_buf->data[4] = time->tm_wday; |
| 378 | cmd_buf->data[5] = hex2bcd(time->tm_mday); |
| 379 | cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1; |
| 380 | cmd_buf->data[7] = hex2bcd(time->tm_year - 100); |
| 381 | } |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 384 | int smu_get_rtc_time(struct rtc_time *time, int spinwait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 386 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | int rc; |
| 388 | |
| 389 | if (smu == NULL) |
| 390 | return -ENODEV; |
| 391 | |
| 392 | memset(time, 0, sizeof(struct rtc_time)); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 393 | rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL, |
| 394 | SMU_CMD_RTC_GET_DATETIME); |
| 395 | if (rc) |
| 396 | return rc; |
| 397 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 399 | time->tm_sec = bcd2hex(cmd.buffer[0]); |
| 400 | time->tm_min = bcd2hex(cmd.buffer[1]); |
| 401 | time->tm_hour = bcd2hex(cmd.buffer[2]); |
| 402 | time->tm_wday = bcd2hex(cmd.buffer[3]); |
| 403 | time->tm_mday = bcd2hex(cmd.buffer[4]); |
| 404 | time->tm_mon = bcd2hex(cmd.buffer[5]) - 1; |
| 405 | time->tm_year = bcd2hex(cmd.buffer[6]) + 100; |
| 406 | |
| 407 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
| 409 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 410 | |
| 411 | int smu_set_rtc_time(struct rtc_time *time, int spinwait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 413 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | int rc; |
| 415 | |
| 416 | if (smu == NULL) |
| 417 | return -ENODEV; |
| 418 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 419 | rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL, |
| 420 | SMU_CMD_RTC_SET_DATETIME, |
| 421 | hex2bcd(time->tm_sec), |
| 422 | hex2bcd(time->tm_min), |
| 423 | hex2bcd(time->tm_hour), |
| 424 | time->tm_wday, |
| 425 | hex2bcd(time->tm_mday), |
| 426 | hex2bcd(time->tm_mon) + 1, |
| 427 | hex2bcd(time->tm_year - 100)); |
| 428 | if (rc) |
| 429 | return rc; |
| 430 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 432 | return 0; |
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 | void smu_shutdown(void) |
| 437 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 438 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
| 440 | if (smu == NULL) |
| 441 | return; |
| 442 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 443 | if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL, |
| 444 | 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0)) |
| 445 | return; |
| 446 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | for (;;) |
| 448 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | void smu_restart(void) |
| 453 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 454 | struct smu_simple_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | if (smu == NULL) |
| 457 | return; |
| 458 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 459 | if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL, |
| 460 | 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0)) |
| 461 | return; |
| 462 | smu_spinwait_simple(&cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | for (;;) |
| 464 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
| 466 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | int smu_present(void) |
| 469 | { |
| 470 | return smu != NULL; |
| 471 | } |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 472 | EXPORT_SYMBOL(smu_present); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 475 | int __init smu_init (void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
| 477 | struct device_node *np; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 478 | const u32 *data; |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 479 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | np = of_find_node_by_type(NULL, "smu"); |
| 482 | if (np == NULL) |
| 483 | return -ENODEV; |
| 484 | |
Benjamin Herrenschmidt | 592a607 | 2008-02-07 14:29:43 +1100 | [diff] [blame] | 485 | printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | if (smu_cmdbuf_abs == 0) { |
| 488 | printk(KERN_ERR "SMU: Command buffer not allocated !\n"); |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 489 | ret = -EINVAL; |
| 490 | goto fail_np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | smu = alloc_bootmem(sizeof(struct smu_device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | spin_lock_init(&smu->lock); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 496 | INIT_LIST_HEAD(&smu->cmd_list); |
| 497 | INIT_LIST_HEAD(&smu->cmd_i2c_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | smu->of_node = np; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 499 | smu->db_irq = NO_IRQ; |
| 500 | smu->msg_irq = NO_IRQ; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a |
| 503 | * 32 bits value safely |
| 504 | */ |
| 505 | smu->cmd_buf_abs = (u32)smu_cmdbuf_abs; |
| 506 | smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs); |
| 507 | |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 508 | smu->db_node = of_find_node_by_name(NULL, "smu-doorbell"); |
| 509 | if (smu->db_node == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n"); |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 511 | ret = -ENXIO; |
| 512 | goto fail_bootmem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
Stephen Rothwell | 01b2726 | 2007-04-27 13:41:15 +1000 | [diff] [blame] | 514 | data = of_get_property(smu->db_node, "reg", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | if (data == NULL) { |
| 516 | printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n"); |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 517 | ret = -ENXIO; |
| 518 | goto fail_db_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | } |
| 520 | |
| 521 | /* Current setup has one doorbell GPIO that does both doorbell |
| 522 | * and ack. GPIOs are at 0x50, best would be to find that out |
| 523 | * in the device-tree though. |
| 524 | */ |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 525 | smu->doorbell = *data; |
| 526 | if (smu->doorbell < 0x50) |
| 527 | smu->doorbell += 0x50; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 528 | |
| 529 | /* Now look for the smu-interrupt GPIO */ |
| 530 | do { |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 531 | smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt"); |
| 532 | if (smu->msg_node == NULL) |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 533 | break; |
Stephen Rothwell | 01b2726 | 2007-04-27 13:41:15 +1000 | [diff] [blame] | 534 | data = of_get_property(smu->msg_node, "reg", NULL); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 535 | if (data == NULL) { |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 536 | of_node_put(smu->msg_node); |
| 537 | smu->msg_node = NULL; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 538 | break; |
| 539 | } |
| 540 | smu->msg = *data; |
| 541 | if (smu->msg < 0x50) |
| 542 | smu->msg += 0x50; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 543 | } while(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | /* Doorbell buffer is currently hard-coded, I didn't find a proper |
| 546 | * device-tree entry giving the address. Best would probably to use |
| 547 | * an offset for K2 base though, but let's do it that way for now. |
| 548 | */ |
| 549 | smu->db_buf = ioremap(0x8000860c, 0x1000); |
| 550 | if (smu->db_buf == NULL) { |
| 551 | printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n"); |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 552 | ret = -ENXIO; |
| 553 | goto fail_msg_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | |
Benjamin Herrenschmidt | 592a607 | 2008-02-07 14:29:43 +1100 | [diff] [blame] | 556 | /* U3 has an issue with NAP mode when issuing SMU commands */ |
| 557 | smu->broken_nap = pmac_get_uninorth_variant() < 4; |
| 558 | if (smu->broken_nap) |
| 559 | printk(KERN_INFO "SMU: using NAP mode workaround\n"); |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | sys_ctrler = SYS_CTRLER_SMU; |
| 562 | return 0; |
| 563 | |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 564 | fail_msg_node: |
| 565 | if (smu->msg_node) |
| 566 | of_node_put(smu->msg_node); |
| 567 | fail_db_node: |
| 568 | of_node_put(smu->db_node); |
| 569 | fail_bootmem: |
| 570 | free_bootmem((unsigned long)smu, sizeof(struct smu_device)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | smu = NULL; |
Julia Lawall | 73f38fe | 2008-06-24 04:14:52 +1000 | [diff] [blame] | 572 | fail_np: |
| 573 | of_node_put(np); |
| 574 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 576 | |
| 577 | |
| 578 | static int smu_late_init(void) |
| 579 | { |
| 580 | if (!smu) |
| 581 | return 0; |
| 582 | |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 583 | init_timer(&smu->i2c_timer); |
| 584 | smu->i2c_timer.function = smu_i2c_retry; |
| 585 | smu->i2c_timer.data = (unsigned long)smu; |
| 586 | |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 587 | if (smu->db_node) { |
| 588 | smu->db_irq = irq_of_parse_and_map(smu->db_node, 0); |
| 589 | if (smu->db_irq == NO_IRQ) |
| 590 | printk(KERN_ERR "smu: failed to map irq for node %s\n", |
| 591 | smu->db_node->full_name); |
| 592 | } |
| 593 | if (smu->msg_node) { |
| 594 | smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0); |
| 595 | if (smu->msg_irq == NO_IRQ) |
| 596 | printk(KERN_ERR "smu: failed to map irq for node %s\n", |
| 597 | smu->msg_node->full_name); |
| 598 | } |
| 599 | |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 600 | /* |
| 601 | * Try to request the interrupts |
| 602 | */ |
| 603 | |
| 604 | if (smu->db_irq != NO_IRQ) { |
| 605 | if (request_irq(smu->db_irq, smu_db_intr, |
Thomas Gleixner | dace145 | 2006-07-01 19:29:38 -0700 | [diff] [blame] | 606 | IRQF_SHARED, "SMU doorbell", smu) < 0) { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 607 | printk(KERN_WARNING "SMU: can't " |
| 608 | "request interrupt %d\n", |
| 609 | smu->db_irq); |
| 610 | smu->db_irq = NO_IRQ; |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | if (smu->msg_irq != NO_IRQ) { |
| 615 | if (request_irq(smu->msg_irq, smu_msg_intr, |
Thomas Gleixner | dace145 | 2006-07-01 19:29:38 -0700 | [diff] [blame] | 616 | IRQF_SHARED, "SMU message", smu) < 0) { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 617 | printk(KERN_WARNING "SMU: can't " |
| 618 | "request interrupt %d\n", |
| 619 | smu->msg_irq); |
| 620 | smu->msg_irq = NO_IRQ; |
| 621 | } |
| 622 | } |
| 623 | |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 624 | smu_irq_inited = 1; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 625 | return 0; |
| 626 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 627 | /* This has to be before arch_initcall as the low i2c stuff relies on the |
| 628 | * above having been done before we reach arch_initcalls |
| 629 | */ |
| 630 | core_initcall(smu_late_init); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 631 | |
| 632 | /* |
| 633 | * sysfs visibility |
| 634 | */ |
| 635 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 636 | static void smu_expose_childs(struct work_struct *unused) |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 637 | { |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 638 | struct device_node *np; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 639 | |
Benjamin Herrenschmidt | a28d3af | 2006-01-07 11:35:26 +1100 | [diff] [blame] | 640 | for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;) |
Stephen Rothwell | 55b61fe | 2007-05-03 17:26:52 +1000 | [diff] [blame] | 641 | if (of_device_is_compatible(np, "smu-sensors")) |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 642 | of_platform_device_create(np, "smu-sensors", |
| 643 | &smu->of_dev->dev); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 644 | } |
| 645 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 646 | static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 647 | |
| 648 | static int smu_platform_probe(struct of_device* dev, |
| 649 | const struct of_device_id *match) |
| 650 | { |
| 651 | if (!smu) |
| 652 | return -ENODEV; |
| 653 | smu->of_dev = dev; |
| 654 | |
| 655 | /* |
| 656 | * Ok, we are matched, now expose all i2c busses. We have to defer |
| 657 | * that unfortunately or it would deadlock inside the device model |
| 658 | */ |
| 659 | schedule_work(&smu_expose_childs_work); |
| 660 | |
| 661 | return 0; |
| 662 | } |
| 663 | |
Márton Németh | 46759a7 | 2010-01-10 01:43:14 +0000 | [diff] [blame] | 664 | static const struct of_device_id smu_platform_match[] = |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 665 | { |
| 666 | { |
| 667 | .type = "smu", |
| 668 | }, |
| 669 | {}, |
| 670 | }; |
| 671 | |
| 672 | static struct of_platform_driver smu_of_platform_driver = |
| 673 | { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame^] | 674 | .driver = { |
| 675 | .name = "smu", |
| 676 | .owner = THIS_MODULE, |
| 677 | .of_match_table = smu_platform_match, |
| 678 | }, |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 679 | .probe = smu_platform_probe, |
| 680 | }; |
| 681 | |
| 682 | static int __init smu_init_sysfs(void) |
| 683 | { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 684 | /* |
| 685 | * Due to sysfs bogosity, a sysdev is not a real device, so |
| 686 | * we should in fact create both if we want sysdev semantics |
| 687 | * for power management. |
| 688 | * For now, we don't power manage machines with an SMU chip, |
| 689 | * I'm a bit too far from figuring out how that works with those |
| 690 | * new chipsets, but that will come back and bite us |
| 691 | */ |
Benjamin Herrenschmidt | 7eebde7 | 2006-11-11 17:24:59 +1100 | [diff] [blame] | 692 | of_register_platform_driver(&smu_of_platform_driver); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 693 | return 0; |
| 694 | } |
| 695 | |
| 696 | device_initcall(smu_init_sysfs); |
| 697 | |
| 698 | struct of_device *smu_get_ofdev(void) |
| 699 | { |
| 700 | if (!smu) |
| 701 | return NULL; |
| 702 | return smu->of_dev; |
| 703 | } |
| 704 | |
| 705 | EXPORT_SYMBOL_GPL(smu_get_ofdev); |
| 706 | |
| 707 | /* |
| 708 | * i2c interface |
| 709 | */ |
| 710 | |
| 711 | static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail) |
| 712 | { |
| 713 | void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done; |
| 714 | void *misc = cmd->misc; |
| 715 | unsigned long flags; |
| 716 | |
| 717 | /* Check for read case */ |
| 718 | if (!fail && cmd->read) { |
| 719 | if (cmd->pdata[0] < 1) |
| 720 | fail = 1; |
| 721 | else |
| 722 | memcpy(cmd->info.data, &cmd->pdata[1], |
| 723 | cmd->info.datalen); |
| 724 | } |
| 725 | |
| 726 | DPRINTK("SMU: completing, success: %d\n", !fail); |
| 727 | |
| 728 | /* Update status and mark no pending i2c command with lock |
| 729 | * held so nobody comes in while we dequeue an eventual |
| 730 | * pending next i2c command |
| 731 | */ |
| 732 | spin_lock_irqsave(&smu->lock, flags); |
| 733 | smu->cmd_i2c_cur = NULL; |
| 734 | wmb(); |
| 735 | cmd->status = fail ? -EIO : 0; |
| 736 | |
| 737 | /* Is there another i2c command waiting ? */ |
| 738 | if (!list_empty(&smu->cmd_i2c_list)) { |
| 739 | struct smu_i2c_cmd *newcmd; |
| 740 | |
| 741 | /* Fetch it, new current, remove from list */ |
| 742 | newcmd = list_entry(smu->cmd_i2c_list.next, |
| 743 | struct smu_i2c_cmd, link); |
| 744 | smu->cmd_i2c_cur = newcmd; |
| 745 | list_del(&cmd->link); |
| 746 | |
| 747 | /* Queue with low level smu */ |
| 748 | list_add_tail(&cmd->scmd.link, &smu->cmd_list); |
| 749 | if (smu->cmd_cur == NULL) |
| 750 | smu_start_cmd(); |
| 751 | } |
| 752 | spin_unlock_irqrestore(&smu->lock, flags); |
| 753 | |
| 754 | /* Call command completion handler if any */ |
| 755 | if (done) |
| 756 | done(cmd, misc); |
| 757 | |
| 758 | } |
| 759 | |
| 760 | |
| 761 | static void smu_i2c_retry(unsigned long data) |
| 762 | { |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 763 | struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 764 | |
| 765 | DPRINTK("SMU: i2c failure, requeuing...\n"); |
| 766 | |
| 767 | /* requeue command simply by resetting reply_len */ |
| 768 | cmd->pdata[0] = 0xff; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 769 | cmd->scmd.reply_len = sizeof(cmd->pdata); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 770 | smu_queue_cmd(&cmd->scmd); |
| 771 | } |
| 772 | |
| 773 | |
| 774 | static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc) |
| 775 | { |
| 776 | struct smu_i2c_cmd *cmd = misc; |
| 777 | int fail = 0; |
| 778 | |
| 779 | DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n", |
| 780 | cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len); |
| 781 | |
| 782 | /* Check for possible status */ |
| 783 | if (scmd->status < 0) |
| 784 | fail = 1; |
| 785 | else if (cmd->read) { |
| 786 | if (cmd->stage == 0) |
| 787 | fail = cmd->pdata[0] != 0; |
| 788 | else |
| 789 | fail = cmd->pdata[0] >= 0x80; |
| 790 | } else { |
| 791 | fail = cmd->pdata[0] != 0; |
| 792 | } |
| 793 | |
| 794 | /* Handle failures by requeuing command, after 5ms interval |
| 795 | */ |
| 796 | if (fail && --cmd->retries > 0) { |
| 797 | DPRINTK("SMU: i2c failure, starting timer...\n"); |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 798 | BUG_ON(cmd != smu->cmd_i2c_cur); |
Benjamin Herrenschmidt | f620753 | 2006-07-10 04:44:44 -0700 | [diff] [blame] | 799 | if (!smu_irq_inited) { |
| 800 | mdelay(5); |
| 801 | smu_i2c_retry(0); |
| 802 | return; |
| 803 | } |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 804 | mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5)); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 805 | return; |
| 806 | } |
| 807 | |
| 808 | /* If failure or stage 1, command is complete */ |
| 809 | if (fail || cmd->stage != 0) { |
| 810 | smu_i2c_complete_command(cmd, fail); |
| 811 | return; |
| 812 | } |
| 813 | |
| 814 | DPRINTK("SMU: going to stage 1\n"); |
| 815 | |
| 816 | /* Ok, initial command complete, now poll status */ |
| 817 | scmd->reply_buf = cmd->pdata; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 818 | scmd->reply_len = sizeof(cmd->pdata); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 819 | scmd->data_buf = cmd->pdata; |
| 820 | scmd->data_len = 1; |
| 821 | cmd->pdata[0] = 0; |
| 822 | cmd->stage = 1; |
| 823 | cmd->retries = 20; |
| 824 | smu_queue_cmd(scmd); |
| 825 | } |
| 826 | |
| 827 | |
| 828 | int smu_queue_i2c(struct smu_i2c_cmd *cmd) |
| 829 | { |
| 830 | unsigned long flags; |
| 831 | |
| 832 | if (smu == NULL) |
| 833 | return -ENODEV; |
| 834 | |
| 835 | /* Fill most fields of scmd */ |
| 836 | cmd->scmd.cmd = SMU_CMD_I2C_COMMAND; |
| 837 | cmd->scmd.done = smu_i2c_low_completion; |
| 838 | cmd->scmd.misc = cmd; |
| 839 | cmd->scmd.reply_buf = cmd->pdata; |
Benjamin Herrenschmidt | 730745a | 2006-01-07 11:30:44 +1100 | [diff] [blame] | 840 | cmd->scmd.reply_len = sizeof(cmd->pdata); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 841 | cmd->scmd.data_buf = (u8 *)(char *)&cmd->info; |
| 842 | cmd->scmd.status = 1; |
| 843 | cmd->stage = 0; |
| 844 | cmd->pdata[0] = 0xff; |
| 845 | cmd->retries = 20; |
| 846 | cmd->status = 1; |
| 847 | |
| 848 | /* Check transfer type, sanitize some "info" fields |
| 849 | * based on transfer type and do more checking |
| 850 | */ |
| 851 | cmd->info.caddr = cmd->info.devaddr; |
| 852 | cmd->read = cmd->info.devaddr & 0x01; |
| 853 | switch(cmd->info.type) { |
| 854 | case SMU_I2C_TRANSFER_SIMPLE: |
| 855 | memset(&cmd->info.sublen, 0, 4); |
| 856 | break; |
| 857 | case SMU_I2C_TRANSFER_COMBINED: |
| 858 | cmd->info.devaddr &= 0xfe; |
| 859 | case SMU_I2C_TRANSFER_STDSUB: |
| 860 | if (cmd->info.sublen > 3) |
| 861 | return -EINVAL; |
| 862 | break; |
| 863 | default: |
| 864 | return -EINVAL; |
| 865 | } |
| 866 | |
| 867 | /* Finish setting up command based on transfer direction |
| 868 | */ |
| 869 | if (cmd->read) { |
| 870 | if (cmd->info.datalen > SMU_I2C_READ_MAX) |
| 871 | return -EINVAL; |
| 872 | memset(cmd->info.data, 0xff, cmd->info.datalen); |
| 873 | cmd->scmd.data_len = 9; |
| 874 | } else { |
| 875 | if (cmd->info.datalen > SMU_I2C_WRITE_MAX) |
| 876 | return -EINVAL; |
| 877 | cmd->scmd.data_len = 9 + cmd->info.datalen; |
| 878 | } |
| 879 | |
| 880 | DPRINTK("SMU: i2c enqueuing command\n"); |
| 881 | DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n", |
| 882 | cmd->read ? "read" : "write", cmd->info.datalen, |
| 883 | cmd->info.bus, cmd->info.caddr, |
| 884 | cmd->info.subaddr[0], cmd->info.type); |
| 885 | |
| 886 | |
| 887 | /* Enqueue command in i2c list, and if empty, enqueue also in |
| 888 | * main command list |
| 889 | */ |
| 890 | spin_lock_irqsave(&smu->lock, flags); |
| 891 | if (smu->cmd_i2c_cur == NULL) { |
| 892 | smu->cmd_i2c_cur = cmd; |
| 893 | list_add_tail(&cmd->scmd.link, &smu->cmd_list); |
| 894 | if (smu->cmd_cur == NULL) |
| 895 | smu_start_cmd(); |
| 896 | } else |
| 897 | list_add_tail(&cmd->link, &smu->cmd_i2c_list); |
| 898 | spin_unlock_irqrestore(&smu->lock, flags); |
| 899 | |
| 900 | return 0; |
| 901 | } |
| 902 | |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 903 | /* |
| 904 | * Handling of "partitions" |
| 905 | */ |
| 906 | |
| 907 | static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len) |
| 908 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 909 | DECLARE_COMPLETION_ONSTACK(comp); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 910 | unsigned int chunk; |
| 911 | struct smu_cmd cmd; |
| 912 | int rc; |
| 913 | u8 params[8]; |
| 914 | |
| 915 | /* We currently use a chunk size of 0xe. We could check the |
| 916 | * SMU firmware version and use bigger sizes though |
| 917 | */ |
| 918 | chunk = 0xe; |
| 919 | |
| 920 | while (len) { |
| 921 | unsigned int clen = min(len, chunk); |
| 922 | |
| 923 | cmd.cmd = SMU_CMD_MISC_ee_COMMAND; |
| 924 | cmd.data_len = 7; |
| 925 | cmd.data_buf = params; |
| 926 | cmd.reply_len = chunk; |
| 927 | cmd.reply_buf = dest; |
| 928 | cmd.done = smu_done_complete; |
| 929 | cmd.misc = ∁ |
| 930 | params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC; |
| 931 | params[1] = 0x4; |
| 932 | *((u32 *)¶ms[2]) = addr; |
| 933 | params[6] = clen; |
| 934 | |
| 935 | rc = smu_queue_cmd(&cmd); |
| 936 | if (rc) |
| 937 | return rc; |
| 938 | wait_for_completion(&comp); |
| 939 | if (cmd.status != 0) |
| 940 | return rc; |
| 941 | if (cmd.reply_len != clen) { |
| 942 | printk(KERN_DEBUG "SMU: short read in " |
| 943 | "smu_read_datablock, got: %d, want: %d\n", |
| 944 | cmd.reply_len, clen); |
| 945 | return -EIO; |
| 946 | } |
| 947 | len -= clen; |
| 948 | addr += clen; |
| 949 | dest += clen; |
| 950 | } |
| 951 | return 0; |
| 952 | } |
| 953 | |
| 954 | static struct smu_sdbp_header *smu_create_sdb_partition(int id) |
| 955 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 956 | DECLARE_COMPLETION_ONSTACK(comp); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 957 | struct smu_simple_cmd cmd; |
| 958 | unsigned int addr, len, tlen; |
| 959 | struct smu_sdbp_header *hdr; |
| 960 | struct property *prop; |
| 961 | |
| 962 | /* First query the partition info */ |
Benjamin Herrenschmidt | 1beb6a7 | 2005-12-14 13:10:10 +1100 | [diff] [blame] | 963 | DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 964 | smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2, |
| 965 | smu_done_complete, &comp, |
| 966 | SMU_CMD_PARTITION_LATEST, id); |
| 967 | wait_for_completion(&comp); |
Benjamin Herrenschmidt | 1beb6a7 | 2005-12-14 13:10:10 +1100 | [diff] [blame] | 968 | DPRINTK("SMU: done, status: %d, reply_len: %d\n", |
| 969 | cmd.cmd.status, cmd.cmd.reply_len); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 970 | |
| 971 | /* Partition doesn't exist (or other error) */ |
| 972 | if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6) |
| 973 | return NULL; |
| 974 | |
| 975 | /* Fetch address and length from reply */ |
| 976 | addr = *((u16 *)cmd.buffer); |
| 977 | len = cmd.buffer[3] << 2; |
| 978 | /* Calucluate total length to allocate, including the 17 bytes |
| 979 | * for "sdb-partition-XX" that we append at the end of the buffer |
| 980 | */ |
| 981 | tlen = sizeof(struct property) + len + 18; |
| 982 | |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 983 | prop = kzalloc(tlen, GFP_KERNEL); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 984 | if (prop == NULL) |
| 985 | return NULL; |
| 986 | hdr = (struct smu_sdbp_header *)(prop + 1); |
| 987 | prop->name = ((char *)prop) + tlen - 18; |
| 988 | sprintf(prop->name, "sdb-partition-%02x", id); |
| 989 | prop->length = len; |
Stephen Rothwell | 1a38147 | 2007-04-03 10:58:52 +1000 | [diff] [blame] | 990 | prop->value = hdr; |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 991 | prop->next = NULL; |
| 992 | |
| 993 | /* Read the datablock */ |
| 994 | if (smu_read_datablock((u8 *)hdr, addr, len)) { |
| 995 | printk(KERN_DEBUG "SMU: datablock read failed while reading " |
| 996 | "partition %02x !\n", id); |
| 997 | goto failure; |
| 998 | } |
| 999 | |
| 1000 | /* Got it, check a few things and create the property */ |
| 1001 | if (hdr->id != id) { |
| 1002 | printk(KERN_DEBUG "SMU: Reading partition %02x and got " |
| 1003 | "%02x !\n", id, hdr->id); |
| 1004 | goto failure; |
| 1005 | } |
| 1006 | if (prom_add_property(smu->of_node, prop)) { |
| 1007 | printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x " |
| 1008 | "property !\n", id); |
| 1009 | goto failure; |
| 1010 | } |
| 1011 | |
| 1012 | return hdr; |
| 1013 | failure: |
| 1014 | kfree(prop); |
| 1015 | return NULL; |
| 1016 | } |
| 1017 | |
| 1018 | /* Note: Only allowed to return error code in pointers (using ERR_PTR) |
| 1019 | * when interruptible is 1 |
| 1020 | */ |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 1021 | const struct smu_sdbp_header *__smu_get_sdb_partition(int id, |
| 1022 | unsigned int *size, int interruptible) |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 1023 | { |
| 1024 | char pname[32]; |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 1025 | const struct smu_sdbp_header *part; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 1026 | |
| 1027 | if (!smu) |
| 1028 | return NULL; |
| 1029 | |
| 1030 | sprintf(pname, "sdb-partition-%02x", id); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1031 | |
Benjamin Herrenschmidt | 1beb6a7 | 2005-12-14 13:10:10 +1100 | [diff] [blame] | 1032 | DPRINTK("smu_get_sdb_partition(%02x)\n", id); |
| 1033 | |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1034 | if (interruptible) { |
| 1035 | int rc; |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 1036 | rc = mutex_lock_interruptible(&smu_part_access); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1037 | if (rc) |
| 1038 | return ERR_PTR(rc); |
| 1039 | } else |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 1040 | mutex_lock(&smu_part_access); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1041 | |
Stephen Rothwell | 01b2726 | 2007-04-27 13:41:15 +1000 | [diff] [blame] | 1042 | part = of_get_property(smu->of_node, pname, size); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1043 | if (part == NULL) { |
Benjamin Herrenschmidt | 1beb6a7 | 2005-12-14 13:10:10 +1100 | [diff] [blame] | 1044 | DPRINTK("trying to extract from SMU ...\n"); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1045 | part = smu_create_sdb_partition(id); |
| 1046 | if (part != NULL && size) |
| 1047 | *size = part->len << 2; |
| 1048 | } |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 1049 | mutex_unlock(&smu_part_access); |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1050 | return part; |
| 1051 | } |
| 1052 | |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 1053 | const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size) |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1054 | { |
| 1055 | return __smu_get_sdb_partition(id, size, 0); |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 1056 | } |
| 1057 | EXPORT_SYMBOL(smu_get_sdb_partition); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1058 | |
| 1059 | |
| 1060 | /* |
| 1061 | * Userland driver interface |
| 1062 | */ |
| 1063 | |
| 1064 | |
| 1065 | static LIST_HEAD(smu_clist); |
| 1066 | static DEFINE_SPINLOCK(smu_clist_lock); |
| 1067 | |
| 1068 | enum smu_file_mode { |
| 1069 | smu_file_commands, |
| 1070 | smu_file_events, |
| 1071 | smu_file_closing |
| 1072 | }; |
| 1073 | |
| 1074 | struct smu_private |
| 1075 | { |
| 1076 | struct list_head list; |
| 1077 | enum smu_file_mode mode; |
| 1078 | int busy; |
| 1079 | struct smu_cmd cmd; |
| 1080 | spinlock_t lock; |
| 1081 | wait_queue_head_t wait; |
| 1082 | u8 buffer[SMU_MAX_DATA]; |
| 1083 | }; |
| 1084 | |
| 1085 | |
| 1086 | static int smu_open(struct inode *inode, struct file *file) |
| 1087 | { |
| 1088 | struct smu_private *pp; |
| 1089 | unsigned long flags; |
| 1090 | |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 1091 | pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1092 | if (pp == 0) |
| 1093 | return -ENOMEM; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1094 | spin_lock_init(&pp->lock); |
| 1095 | pp->mode = smu_file_commands; |
| 1096 | init_waitqueue_head(&pp->wait); |
| 1097 | |
Arnd Bergmann | b9bde77 | 2008-05-20 19:16:11 +0200 | [diff] [blame] | 1098 | lock_kernel(); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1099 | spin_lock_irqsave(&smu_clist_lock, flags); |
| 1100 | list_add(&pp->list, &smu_clist); |
| 1101 | spin_unlock_irqrestore(&smu_clist_lock, flags); |
| 1102 | file->private_data = pp; |
Arnd Bergmann | b9bde77 | 2008-05-20 19:16:11 +0200 | [diff] [blame] | 1103 | unlock_kernel(); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1104 | |
| 1105 | return 0; |
| 1106 | } |
| 1107 | |
| 1108 | |
| 1109 | static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc) |
| 1110 | { |
| 1111 | struct smu_private *pp = misc; |
| 1112 | |
| 1113 | wake_up_all(&pp->wait); |
| 1114 | } |
| 1115 | |
| 1116 | |
| 1117 | static ssize_t smu_write(struct file *file, const char __user *buf, |
| 1118 | size_t count, loff_t *ppos) |
| 1119 | { |
| 1120 | struct smu_private *pp = file->private_data; |
| 1121 | unsigned long flags; |
| 1122 | struct smu_user_cmd_hdr hdr; |
| 1123 | int rc = 0; |
| 1124 | |
| 1125 | if (pp->busy) |
| 1126 | return -EBUSY; |
| 1127 | else if (copy_from_user(&hdr, buf, sizeof(hdr))) |
| 1128 | return -EFAULT; |
| 1129 | else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) { |
| 1130 | pp->mode = smu_file_events; |
| 1131 | return 0; |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1132 | } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) { |
Jeremy Kerr | 018a3d1 | 2006-07-12 15:40:29 +1000 | [diff] [blame] | 1133 | const struct smu_sdbp_header *part; |
Benjamin Herrenschmidt | 183d020 | 2005-11-07 14:29:02 +1100 | [diff] [blame] | 1134 | part = __smu_get_sdb_partition(hdr.cmd, NULL, 1); |
| 1135 | if (part == NULL) |
| 1136 | return -EINVAL; |
| 1137 | else if (IS_ERR(part)) |
| 1138 | return PTR_ERR(part); |
| 1139 | return 0; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1140 | } else if (hdr.cmdtype != SMU_CMDTYPE_SMU) |
| 1141 | return -EINVAL; |
| 1142 | else if (pp->mode != smu_file_commands) |
| 1143 | return -EBADFD; |
| 1144 | else if (hdr.data_len > SMU_MAX_DATA) |
| 1145 | return -EINVAL; |
| 1146 | |
| 1147 | spin_lock_irqsave(&pp->lock, flags); |
| 1148 | if (pp->busy) { |
| 1149 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1150 | return -EBUSY; |
| 1151 | } |
| 1152 | pp->busy = 1; |
| 1153 | pp->cmd.status = 1; |
| 1154 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1155 | |
| 1156 | if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) { |
| 1157 | pp->busy = 0; |
| 1158 | return -EFAULT; |
| 1159 | } |
| 1160 | |
| 1161 | pp->cmd.cmd = hdr.cmd; |
| 1162 | pp->cmd.data_len = hdr.data_len; |
| 1163 | pp->cmd.reply_len = SMU_MAX_DATA; |
| 1164 | pp->cmd.data_buf = pp->buffer; |
| 1165 | pp->cmd.reply_buf = pp->buffer; |
| 1166 | pp->cmd.done = smu_user_cmd_done; |
| 1167 | pp->cmd.misc = pp; |
| 1168 | rc = smu_queue_cmd(&pp->cmd); |
| 1169 | if (rc < 0) |
| 1170 | return rc; |
| 1171 | return count; |
| 1172 | } |
| 1173 | |
| 1174 | |
| 1175 | static ssize_t smu_read_command(struct file *file, struct smu_private *pp, |
| 1176 | char __user *buf, size_t count) |
| 1177 | { |
| 1178 | DECLARE_WAITQUEUE(wait, current); |
| 1179 | struct smu_user_reply_hdr hdr; |
| 1180 | unsigned long flags; |
| 1181 | int size, rc = 0; |
| 1182 | |
| 1183 | if (!pp->busy) |
| 1184 | return 0; |
| 1185 | if (count < sizeof(struct smu_user_reply_hdr)) |
| 1186 | return -EOVERFLOW; |
| 1187 | spin_lock_irqsave(&pp->lock, flags); |
| 1188 | if (pp->cmd.status == 1) { |
| 1189 | if (file->f_flags & O_NONBLOCK) |
| 1190 | return -EAGAIN; |
| 1191 | add_wait_queue(&pp->wait, &wait); |
| 1192 | for (;;) { |
| 1193 | set_current_state(TASK_INTERRUPTIBLE); |
| 1194 | rc = 0; |
| 1195 | if (pp->cmd.status != 1) |
| 1196 | break; |
| 1197 | rc = -ERESTARTSYS; |
| 1198 | if (signal_pending(current)) |
| 1199 | break; |
| 1200 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1201 | schedule(); |
| 1202 | spin_lock_irqsave(&pp->lock, flags); |
| 1203 | } |
| 1204 | set_current_state(TASK_RUNNING); |
| 1205 | remove_wait_queue(&pp->wait, &wait); |
| 1206 | } |
| 1207 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1208 | if (rc) |
| 1209 | return rc; |
| 1210 | if (pp->cmd.status != 0) |
| 1211 | pp->cmd.reply_len = 0; |
| 1212 | size = sizeof(hdr) + pp->cmd.reply_len; |
| 1213 | if (count < size) |
| 1214 | size = count; |
| 1215 | rc = size; |
| 1216 | hdr.status = pp->cmd.status; |
| 1217 | hdr.reply_len = pp->cmd.reply_len; |
| 1218 | if (copy_to_user(buf, &hdr, sizeof(hdr))) |
| 1219 | return -EFAULT; |
| 1220 | size -= sizeof(hdr); |
| 1221 | if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size)) |
| 1222 | return -EFAULT; |
| 1223 | pp->busy = 0; |
| 1224 | |
| 1225 | return rc; |
| 1226 | } |
| 1227 | |
| 1228 | |
| 1229 | static ssize_t smu_read_events(struct file *file, struct smu_private *pp, |
| 1230 | char __user *buf, size_t count) |
| 1231 | { |
| 1232 | /* Not implemented */ |
| 1233 | msleep_interruptible(1000); |
| 1234 | return 0; |
| 1235 | } |
| 1236 | |
| 1237 | |
| 1238 | static ssize_t smu_read(struct file *file, char __user *buf, |
| 1239 | size_t count, loff_t *ppos) |
| 1240 | { |
| 1241 | struct smu_private *pp = file->private_data; |
| 1242 | |
| 1243 | if (pp->mode == smu_file_commands) |
| 1244 | return smu_read_command(file, pp, buf, count); |
| 1245 | if (pp->mode == smu_file_events) |
| 1246 | return smu_read_events(file, pp, buf, count); |
| 1247 | |
| 1248 | return -EBADFD; |
| 1249 | } |
| 1250 | |
| 1251 | static unsigned int smu_fpoll(struct file *file, poll_table *wait) |
| 1252 | { |
| 1253 | struct smu_private *pp = file->private_data; |
| 1254 | unsigned int mask = 0; |
| 1255 | unsigned long flags; |
| 1256 | |
| 1257 | if (pp == 0) |
| 1258 | return 0; |
| 1259 | |
| 1260 | if (pp->mode == smu_file_commands) { |
| 1261 | poll_wait(file, &pp->wait, wait); |
| 1262 | |
| 1263 | spin_lock_irqsave(&pp->lock, flags); |
| 1264 | if (pp->busy && pp->cmd.status != 1) |
| 1265 | mask |= POLLIN; |
| 1266 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1267 | } if (pp->mode == smu_file_events) { |
| 1268 | /* Not yet implemented */ |
| 1269 | } |
| 1270 | return mask; |
| 1271 | } |
| 1272 | |
| 1273 | static int smu_release(struct inode *inode, struct file *file) |
| 1274 | { |
| 1275 | struct smu_private *pp = file->private_data; |
| 1276 | unsigned long flags; |
| 1277 | unsigned int busy; |
| 1278 | |
| 1279 | if (pp == 0) |
| 1280 | return 0; |
| 1281 | |
| 1282 | file->private_data = NULL; |
| 1283 | |
| 1284 | /* Mark file as closing to avoid races with new request */ |
| 1285 | spin_lock_irqsave(&pp->lock, flags); |
| 1286 | pp->mode = smu_file_closing; |
| 1287 | busy = pp->busy; |
| 1288 | |
| 1289 | /* Wait for any pending request to complete */ |
| 1290 | if (busy && pp->cmd.status == 1) { |
| 1291 | DECLARE_WAITQUEUE(wait, current); |
| 1292 | |
| 1293 | add_wait_queue(&pp->wait, &wait); |
| 1294 | for (;;) { |
| 1295 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 1296 | if (pp->cmd.status != 1) |
| 1297 | break; |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1298 | spin_unlock_irqrestore(&pp->lock, flags); |
Andrew Morton | 94256dd | 2007-04-16 22:53:25 -0700 | [diff] [blame] | 1299 | schedule(); |
| 1300 | spin_lock_irqsave(&pp->lock, flags); |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1301 | } |
| 1302 | set_current_state(TASK_RUNNING); |
| 1303 | remove_wait_queue(&pp->wait, &wait); |
| 1304 | } |
| 1305 | spin_unlock_irqrestore(&pp->lock, flags); |
| 1306 | |
| 1307 | spin_lock_irqsave(&smu_clist_lock, flags); |
| 1308 | list_del(&pp->list); |
| 1309 | spin_unlock_irqrestore(&smu_clist_lock, flags); |
| 1310 | kfree(pp); |
| 1311 | |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | |
Arjan van de Ven | fa027c2 | 2007-02-12 00:55:33 -0800 | [diff] [blame] | 1316 | static const struct file_operations smu_device_fops = { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1317 | .llseek = no_llseek, |
| 1318 | .read = smu_read, |
| 1319 | .write = smu_write, |
| 1320 | .poll = smu_fpoll, |
| 1321 | .open = smu_open, |
| 1322 | .release = smu_release, |
| 1323 | }; |
| 1324 | |
Stephen Rothwell | 6b67f62c | 2005-09-27 14:09:39 +1000 | [diff] [blame] | 1325 | static struct miscdevice pmu_device = { |
Benjamin Herrenschmidt | 0365ba7 | 2005-09-22 21:44:06 -0700 | [diff] [blame] | 1326 | MISC_DYNAMIC_MINOR, "smu", &smu_device_fops |
| 1327 | }; |
| 1328 | |
| 1329 | static int smu_device_init(void) |
| 1330 | { |
| 1331 | if (!smu) |
| 1332 | return -ENODEV; |
| 1333 | if (misc_register(&pmu_device) < 0) |
| 1334 | printk(KERN_ERR "via-pmu: cannot register misc device.\n"); |
| 1335 | return 0; |
| 1336 | } |
| 1337 | device_initcall(smu_device_init); |