drivers/sbus/char/uctrl.c

   1 /* uctrl.c: TS102 Microcontroller interface on Tadpole Sparcbook 3
   2  *
   3  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
   4  * Copyright 2008 David S. Miller (davem@davemloft.net)
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/errno.h>
   9 #include <linux/delay.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/slab.h>
  12 #include <linux/mutex.h>
  13 #include <linux/ioport.h>
  14 #include <linux/miscdevice.h>
  15 #include <linux/mm.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18
  19 #include <asm/openprom.h>
  20 #include <asm/oplib.h>
  21 #include <asm/irq.h>
  22 #include <asm/io.h>
  23 #include <asm/pgtable.h>
  24
  25 #define UCTRL_MINOR     174
  26
  27 #define DEBUG 1
  28 #ifdef DEBUG
  29 #define dprintk(x) printk x
  30 #else
  31 #define dprintk(x)
  32 #endif
  33
  34 struct uctrl_regs {
  35         u32 uctrl_intr;
  36         u32 uctrl_data;
  37         u32 uctrl_stat;
  38         u32 uctrl_xxx[5];
  39 };
  40
  41 struct ts102_regs {
  42         u32 card_a_intr;
  43         u32 card_a_stat;
  44         u32 card_a_ctrl;
  45         u32 card_a_xxx;
  46         u32 card_b_intr;
  47         u32 card_b_stat;
  48         u32 card_b_ctrl;
  49         u32 card_b_xxx;
  50         u32 uctrl_intr;
  51         u32 uctrl_data;
  52         u32 uctrl_stat;
  53         u32 uctrl_xxx;
  54         u32 ts102_xxx[4];
  55 };
  56
  57 /* Bits for uctrl_intr register */
  58 #define UCTRL_INTR_TXE_REQ         0x01    /* transmit FIFO empty int req */
  59 #define UCTRL_INTR_TXNF_REQ        0x02    /* transmit FIFO not full int req */
  60 #define UCTRL_INTR_RXNE_REQ        0x04    /* receive FIFO not empty int req */
  61 #define UCTRL_INTR_RXO_REQ         0x08    /* receive FIFO overflow int req */
  62 #define UCTRL_INTR_TXE_MSK         0x10    /* transmit FIFO empty mask */
  63 #define UCTRL_INTR_TXNF_MSK        0x20    /* transmit FIFO not full mask */
  64 #define UCTRL_INTR_RXNE_MSK        0x40    /* receive FIFO not empty mask */
  65 #define UCTRL_INTR_RXO_MSK         0x80    /* receive FIFO overflow mask */
  66
  67 /* Bits for uctrl_stat register */
  68 #define UCTRL_STAT_TXE_STA         0x01    /* transmit FIFO empty status */
  69 #define UCTRL_STAT_TXNF_STA        0x02    /* transmit FIFO not full status */
  70 #define UCTRL_STAT_RXNE_STA        0x04    /* receive FIFO not empty status */
  71 #define UCTRL_STAT_RXO_STA         0x08    /* receive FIFO overflow status */
  72
  73 static DEFINE_MUTEX(uctrl_mutex);
  74 static const char *uctrl_extstatus[16] = {
  75         "main power available",
  76         "internal battery attached",
  77         "external battery attached",
  78         "external VGA attached",
  79         "external keyboard attached",
  80         "external mouse attached",
  81         "lid down",
  82         "internal battery currently charging",
  83         "external battery currently charging",
  84         "internal battery currently discharging",
  85         "external battery currently discharging",
  86 };
  87
  88 /* Everything required for one transaction with the uctrl */
  89 struct uctrl_txn {
  90         u8 opcode;
  91         u8 inbits;
  92         u8 outbits;
  93         u8 *inbuf;
  94         u8 *outbuf;
  95 };
  96
  97 struct uctrl_status {
  98         u8 current_temp; /* 0x07 */
  99         u8 reset_status; /* 0x0b */
 100         u16 event_status; /* 0x0c */
 101         u16 error_status; /* 0x10 */
 102         u16 external_status; /* 0x11, 0x1b */
 103         u8 internal_charge; /* 0x18 */
 104         u8 external_charge; /* 0x19 */
 105         u16 control_lcd; /* 0x20 */
 106         u8 control_bitport; /* 0x21 */
 107         u8 speaker_volume; /* 0x23 */
 108         u8 control_tft_brightness; /* 0x24 */
 109         u8 control_kbd_repeat_delay; /* 0x28 */
 110         u8 control_kbd_repeat_period; /* 0x29 */
 111         u8 control_screen_contrast; /* 0x2F */
 112 };
 113
 114 enum uctrl_opcode {
 115   READ_SERIAL_NUMBER=0x1,
 116   READ_ETHERNET_ADDRESS=0x2,
 117   READ_HARDWARE_VERSION=0x3,
 118   READ_MICROCONTROLLER_VERSION=0x4,
 119   READ_MAX_TEMPERATURE=0x5,
 120   READ_MIN_TEMPERATURE=0x6,
 121   READ_CURRENT_TEMPERATURE=0x7,
 122   READ_SYSTEM_VARIANT=0x8,
 123   READ_POWERON_CYCLES=0x9,
 124   READ_POWERON_SECONDS=0xA,
 125   READ_RESET_STATUS=0xB,
 126   READ_EVENT_STATUS=0xC,
 127   READ_REAL_TIME_CLOCK=0xD,
 128   READ_EXTERNAL_VGA_PORT=0xE,
 129   READ_MICROCONTROLLER_ROM_CHECKSUM=0xF,
 130   READ_ERROR_STATUS=0x10,
 131   READ_EXTERNAL_STATUS=0x11,
 132   READ_USER_CONFIGURATION_AREA=0x12,
 133   READ_MICROCONTROLLER_VOLTAGE=0x13,
 134   READ_INTERNAL_BATTERY_VOLTAGE=0x14,
 135   READ_DCIN_VOLTAGE=0x15,
 136   READ_HORIZONTAL_POINTER_VOLTAGE=0x16,
 137   READ_VERTICAL_POINTER_VOLTAGE=0x17,
 138   READ_INTERNAL_BATTERY_CHARGE_LEVEL=0x18,
 139   READ_EXTERNAL_BATTERY_CHARGE_LEVEL=0x19,
 140   READ_REAL_TIME_CLOCK_ALARM=0x1A,
 141   READ_EVENT_STATUS_NO_RESET=0x1B,
 142   READ_INTERNAL_KEYBOARD_LAYOUT=0x1C,
 143   READ_EXTERNAL_KEYBOARD_LAYOUT=0x1D,
 144   READ_EEPROM_STATUS=0x1E,
 145   CONTROL_LCD=0x20,
 146   CONTROL_BITPORT=0x21,
 147   SPEAKER_VOLUME=0x23,
 148   CONTROL_TFT_BRIGHTNESS=0x24,
 149   CONTROL_WATCHDOG=0x25,
 150   CONTROL_FACTORY_EEPROM_AREA=0x26,
 151   CONTROL_KBD_TIME_UNTIL_REPEAT=0x28,
 152   CONTROL_KBD_TIME_BETWEEN_REPEATS=0x29,
 153   CONTROL_TIMEZONE=0x2A,
 154   CONTROL_MARK_SPACE_RATIO=0x2B,
 155   CONTROL_DIAGNOSTIC_MODE=0x2E,
 156   CONTROL_SCREEN_CONTRAST=0x2F,
 157   RING_BELL=0x30,
 158   SET_DIAGNOSTIC_STATUS=0x32,
 159   CLEAR_KEY_COMBINATION_TABLE=0x33,
 160   PERFORM_SOFTWARE_RESET=0x34,
 161   SET_REAL_TIME_CLOCK=0x35,
 162   RECALIBRATE_POINTING_STICK=0x36,
 163   SET_BELL_FREQUENCY=0x37,
 164   SET_INTERNAL_BATTERY_CHARGE_RATE=0x39,
 165   SET_EXTERNAL_BATTERY_CHARGE_RATE=0x3A,
 166   SET_REAL_TIME_CLOCK_ALARM=0x3B,
 167   READ_EEPROM=0x40,
 168   WRITE_EEPROM=0x41,
 169   WRITE_TO_STATUS_DISPLAY=0x42,
 170   DEFINE_SPECIAL_CHARACTER=0x43,
 171   DEFINE_KEY_COMBINATION_ENTRY=0x50,
 172   DEFINE_STRING_TABLE_ENTRY=0x51,
 173   DEFINE_STATUS_SCREEN_DISPLAY=0x52,
 174   PERFORM_EMU_COMMANDS=0x64,
 175   READ_EMU_REGISTER=0x65,
 176   WRITE_EMU_REGISTER=0x66,
 177   READ_EMU_RAM=0x67,
 178   WRITE_EMU_RAM=0x68,
 179   READ_BQ_REGISTER=0x69,
 180   WRITE_BQ_REGISTER=0x6A,
 181   SET_USER_PASSWORD=0x70,
 182   VERIFY_USER_PASSWORD=0x71,
 183   GET_SYSTEM_PASSWORD_KEY=0x72,
 184   VERIFY_SYSTEM_PASSWORD=0x73,
 185   POWER_OFF=0x82,
 186   POWER_RESTART=0x83,
 187 };
 188
 189 static struct uctrl_driver {
 190         struct uctrl_regs __iomem *regs;
 191         int irq;
 192         int pending;
 193         struct uctrl_status status;
 194 } *global_driver;
 195
 196 static void uctrl_get_event_status(struct uctrl_driver *);
 197 static void uctrl_get_external_status(struct uctrl_driver *);
 198
 199 static long
 200 uctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 201 {
 202         switch (cmd) {
 203                 default:
 204                         return -EINVAL;
 205         }
 206         return 0;
 207 }
 208
 209 static int
 210 uctrl_open(struct inode *inode, struct file *file)
 211 {
 212         mutex_lock(&uctrl_mutex);
 213         uctrl_get_event_status(global_driver);
 214         uctrl_get_external_status(global_driver);
 215         mutex_unlock(&uctrl_mutex);
 216         return 0;
 217 }
 218
 219 static irqreturn_t uctrl_interrupt(int irq, void *dev_id)
 220 {
 221         return IRQ_HANDLED;
 222 }
 223
 224 static const struct file_operations uctrl_fops = {
 225         .owner =        THIS_MODULE,
 226         .llseek =       no_llseek,
 227         .unlocked_ioctl =       uctrl_ioctl,
 228         .open =         uctrl_open,
 229 };
 230
 231 static struct miscdevice uctrl_dev = {
 232         UCTRL_MINOR,
 233         "uctrl",
 234         &uctrl_fops
 235 };
 236
 237 /* Wait for space to write, then write to it */
 238 #define WRITEUCTLDATA(value) \
 239 { \
 240   unsigned int i; \
 241   for (i = 0; i < 10000; i++) { \
 242       if (UCTRL_STAT_TXNF_STA & sbus_readl(&driver->regs->uctrl_stat)) \
 243       break; \
 244   } \
 245   dprintk(("write data 0x%02x\n", value)); \
 246   sbus_writel(value, &driver->regs->uctrl_data); \
 247 }
 248
 249 /* Wait for something to read, read it, then clear the bit */
 250 #define READUCTLDATA(value) \
 251 { \
 252   unsigned int i; \
 253   value = 0; \
 254   for (i = 0; i < 10000; i++) { \
 255       if ((UCTRL_STAT_RXNE_STA & sbus_readl(&driver->regs->uctrl_stat)) == 0) \
 256       break; \
 257     udelay(1); \
 258   } \
 259   value = sbus_readl(&driver->regs->uctrl_data); \
 260   dprintk(("read data 0x%02x\n", value)); \
 261   sbus_writel(UCTRL_STAT_RXNE_STA, &driver->regs->uctrl_stat); \
 262 }
 263
 264 static void uctrl_do_txn(struct uctrl_driver *driver, struct uctrl_txn *txn)
 265 {
 266         int stat, incnt, outcnt, bytecnt, intr;
 267         u32 byte;
 268
 269         stat = sbus_readl(&driver->regs->uctrl_stat);
 270         intr = sbus_readl(&driver->regs->uctrl_intr);
 271         sbus_writel(stat, &driver->regs->uctrl_stat);
 272
 273         dprintk(("interrupt stat 0x%x int 0x%x\n", stat, intr));
 274
 275         incnt = txn->inbits;
 276         outcnt = txn->outbits;
 277         byte = (txn->opcode << 8);
 278         WRITEUCTLDATA(byte);
 279
 280         bytecnt = 0;
 281         while (incnt > 0) {
 282                 byte = (txn->inbuf[bytecnt] << 8);
 283                 WRITEUCTLDATA(byte);
 284                 incnt--;
 285                 bytecnt++;
 286         }
 287
 288         /* Get the ack */
 289         READUCTLDATA(byte);
 290         dprintk(("ack was %x\n", (byte >> 8)));
 291
 292         bytecnt = 0;
 293         while (outcnt > 0) {
 294                 READUCTLDATA(byte);
 295                 txn->outbuf[bytecnt] = (byte >> 8);
 296                 dprintk(("set byte to %02x\n", byte));
 297                 outcnt--;
 298                 bytecnt++;
 299         }
 300 }
 301
 302 static void uctrl_get_event_status(struct uctrl_driver *driver)
 303 {
 304         struct uctrl_txn txn;
 305         u8 outbits[2];
 306
 307         txn.opcode = READ_EVENT_STATUS;
 308         txn.inbits = 0;
 309         txn.outbits = 2;
 310         txn.inbuf = NULL;
 311         txn.outbuf = outbits;
 312
 313         uctrl_do_txn(driver, &txn);
 314
 315         dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
 316         driver->status.event_status =
 317                 ((outbits[0] & 0xff) << 8) | (outbits[1] & 0xff);
 318         dprintk(("ev is %x\n", driver->status.event_status));
 319 }
 320
 321 static void uctrl_get_external_status(struct uctrl_driver *driver)
 322 {
 323         struct uctrl_txn txn;
 324         u8 outbits[2];
 325         int i, v;
 326
 327         txn.opcode = READ_EXTERNAL_STATUS;
 328         txn.inbits = 0;
 329         txn.outbits = 2;
 330         txn.inbuf = NULL;
 331         txn.outbuf = outbits;
 332
 333         uctrl_do_txn(driver, &txn);
 334
 335         dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
 336         driver->status.external_status =
 337                 ((outbits[0] * 256) + (outbits[1]));
 338         dprintk(("ex is %x\n", driver->status.external_status));
 339         v = driver->status.external_status;
 340         for (i = 0; v != 0; i++, v >>= 1) {
 341                 if (v & 1) {
 342                         dprintk(("%s%s", " ", uctrl_extstatus[i]));
 343                 }
 344         }
 345         dprintk(("\n"));
 346
 347 }
 348
 349 static int uctrl_probe(struct platform_device *op)
 350 {
 351         struct uctrl_driver *p;
 352         int err = -ENOMEM;
 353
 354         p = kzalloc(sizeof(*p), GFP_KERNEL);
 355         if (!p) {
 356                 printk(KERN_ERR "uctrl: Unable to allocate device struct.\n");
 357                 goto out;
 358         }
 359
 360         p->regs = of_ioremap(&op->resource[0], 0,
 361                              resource_size(&op->resource[0]),
 362                              "uctrl");
 363         if (!p->regs) {
 364                 printk(KERN_ERR "uctrl: Unable to map registers.\n");
 365                 goto out_free;
 366         }
 367
 368         p->irq = op->archdata.irqs[0];
 369         err = request_irq(p->irq, uctrl_interrupt, 0, "uctrl", p);
 370         if (err) {
 371                 printk(KERN_ERR "uctrl: Unable to register irq.\n");
 372                 goto out_iounmap;
 373         }
 374
 375         err = misc_register(&uctrl_dev);
 376         if (err) {
 377                 printk(KERN_ERR "uctrl: Unable to register misc device.\n");
 378                 goto out_free_irq;
 379         }
 380
 381         sbus_writel(UCTRL_INTR_RXNE_REQ|UCTRL_INTR_RXNE_MSK, &p->regs->uctrl_intr);
 382         printk(KERN_INFO "%s: uctrl regs[0x%p] (irq %d)\n",
 383                op->dev.of_node->full_name, p->regs, p->irq);
 384         uctrl_get_event_status(p);
 385         uctrl_get_external_status(p);
 386
 387         dev_set_drvdata(&op->dev, p);
 388         global_driver = p;
 389
 390 out:
 391         return err;
 392
 393 out_free_irq:
 394         free_irq(p->irq, p);
 395
 396 out_iounmap:
 397         of_iounmap(&op->resource[0], p->regs, resource_size(&op->resource[0]));
 398
 399 out_free:
 400         kfree(p);
 401         goto out;
 402 }
 403
 404 static int uctrl_remove(struct platform_device *op)
 405 {
 406         struct uctrl_driver *p = dev_get_drvdata(&op->dev);
 407
 408         if (p) {
 409                 misc_deregister(&uctrl_dev);
 410                 free_irq(p->irq, p);
 411                 of_iounmap(&op->resource[0], p->regs, resource_size(&op->resource[0]));
 412                 kfree(p);
 413         }
 414         return 0;
 415 }
 416
 417 static const struct of_device_id uctrl_match[] = {
 418         {
 419                 .name = "uctrl",
 420         },
 421         {},
 422 };
 423 MODULE_DEVICE_TABLE(of, uctrl_match);
 424
 425 static struct platform_driver uctrl_driver = {
 426         .driver = {
 427                 .name = "uctrl",
 428                 .of_match_table = uctrl_match,
 429         },
 430         .probe          = uctrl_probe,
 431         .remove         = uctrl_remove,
 432 };
 433
 434
 435 module_platform_driver(uctrl_driver);
 436
 437 MODULE_LICENSE("GPL");