drivers/sbus/char/uctrl.c

   1 /* $Id: uctrl.c,v 1.12 2001/10/08 22:19:51 davem Exp $
   2  * uctrl.c: TS102 Microcontroller interface on Tadpole Sparcbook 3
   3  *
   4  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/sched.h>
   9 #include <linux/errno.h>
  10 #include <linux/delay.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/slab.h>
  13 #include <linux/ioport.h>
  14 #include <linux/init.h>
  15 #include <linux/miscdevice.h>
  16 #include <linux/mm.h>
  17
  18 #include <asm/openprom.h>
  19 #include <asm/oplib.h>
  20 #include <asm/system.h>
  21 #include <asm/irq.h>
  22 #include <asm/io.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/sbus.h>
  25
  26 #define UCTRL_MINOR     174
  27
  28 #define DEBUG 1
  29 #ifdef DEBUG
  30 #define dprintk(x) printk x
  31 #else
  32 #define dprintk(x)
  33 #endif
  34
  35 struct uctrl_regs {
  36         volatile u32 uctrl_intr;
  37         volatile u32 uctrl_data;
  38         volatile u32 uctrl_stat;
  39         volatile u32 uctrl_xxx[5];
  40 };
  41
  42 struct ts102_regs {
  43         volatile u32 card_a_intr;
  44         volatile u32 card_a_stat;
  45         volatile u32 card_a_ctrl;
  46         volatile u32 card_a_xxx;
  47         volatile u32 card_b_intr;
  48         volatile u32 card_b_stat;
  49         volatile u32 card_b_ctrl;
  50         volatile u32 card_b_xxx;
  51         volatile u32 uctrl_intr;
  52         volatile u32 uctrl_data;
  53         volatile u32 uctrl_stat;
  54         volatile u32 uctrl_xxx;
  55         volatile u32 ts102_xxx[4];
  56 };
  57
  58 /* Bits for uctrl_intr register */
  59 #define UCTRL_INTR_TXE_REQ         0x01    /* transmit FIFO empty int req */
  60 #define UCTRL_INTR_TXNF_REQ        0x02    /* transmit FIFO not full int req */
  61 #define UCTRL_INTR_RXNE_REQ        0x04    /* receive FIFO not empty int req */
  62 #define UCTRL_INTR_RXO_REQ         0x08    /* receive FIFO overflow int req */
  63 #define UCTRL_INTR_TXE_MSK         0x10    /* transmit FIFO empty mask */
  64 #define UCTRL_INTR_TXNF_MSK        0x20    /* transmit FIFO not full mask */
  65 #define UCTRL_INTR_RXNE_MSK        0x40    /* receive FIFO not empty mask */
  66 #define UCTRL_INTR_RXO_MSK         0x80    /* receive FIFO overflow mask */
  67
  68 /* Bits for uctrl_stat register */
  69 #define UCTRL_STAT_TXE_STA         0x01    /* transmit FIFO empty status */
  70 #define UCTRL_STAT_TXNF_STA        0x02    /* transmit FIFO not full status */
  71 #define UCTRL_STAT_RXNE_STA        0x04    /* receive FIFO not empty status */
  72 #define UCTRL_STAT_RXO_STA         0x08    /* receive FIFO overflow status */
  73
  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 struct uctrl_driver {
 190         struct uctrl_regs *regs;
 191         int irq;
 192         int pending;
 193         struct uctrl_status status;
 194 };
 195
 196 static struct uctrl_driver drv;
 197
 198 void uctrl_get_event_status(void);
 199 void uctrl_get_external_status(void);
 200
 201 static int
 202 uctrl_ioctl(struct inode *inode, struct file *file,
 203               unsigned int cmd, unsigned long arg)
 204 {
 205         switch (cmd) {
 206                 default:
 207                         return -EINVAL;
 208         }
 209         return 0;
 210 }
 211
 212 static int
 213 uctrl_open(struct inode *inode, struct file *file)
 214 {
 215         uctrl_get_event_status();
 216         uctrl_get_external_status();
 217         return 0;
 218 }
 219
 220 static irqreturn_t uctrl_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 221 {
 222         struct uctrl_driver *driver = (struct uctrl_driver *)dev_id;
 223         printk("in uctrl_interrupt\n");
 224         return IRQ_HANDLED;
 225 }
 226
 227 static struct file_operations uctrl_fops = {
 228         .owner =        THIS_MODULE,
 229         .llseek =       no_llseek,
 230         .ioctl =        uctrl_ioctl,
 231         .open =         uctrl_open,
 232 };
 233
 234 static struct miscdevice uctrl_dev = {
 235         UCTRL_MINOR,
 236         "uctrl",
 237         &uctrl_fops
 238 };
 239
 240 /* Wait for space to write, then write to it */
 241 #define WRITEUCTLDATA(value) \
 242 { \
 243   unsigned int i; \
 244   for (i = 0; i < 10000; i++) { \
 245     if (UCTRL_STAT_TXNF_STA & driver->regs->uctrl_stat) \
 246       break; \
 247   } \
 248   dprintk(("write data 0x%02x\n", value)); \
 249   driver->regs->uctrl_data = value; \
 250 }
 251
 252 /* Wait for something to read, read it, then clear the bit */
 253 #define READUCTLDATA(value) \
 254 { \
 255   unsigned int i; \
 256   value = 0; \
 257   for (i = 0; i < 10000; i++) { \
 258     if ((UCTRL_STAT_RXNE_STA & driver->regs->uctrl_stat) == 0) \
 259       break; \
 260     udelay(1); \
 261   } \
 262   value = driver->regs->uctrl_data; \
 263   dprintk(("read data 0x%02x\n", value)); \
 264   driver->regs->uctrl_stat = UCTRL_STAT_RXNE_STA; \
 265 }
 266
 267 void uctrl_set_video(int status)
 268 {
 269         struct uctrl_driver *driver = &drv;
 270
 271 }
 272
 273 static void uctrl_do_txn(struct uctrl_txn *txn)
 274 {
 275         struct uctrl_driver *driver = &drv;
 276         int stat, incnt, outcnt, bytecnt, intr;
 277         u32 byte;
 278
 279         stat = driver->regs->uctrl_stat;
 280         intr = driver->regs->uctrl_intr;
 281         driver->regs->uctrl_stat = stat;
 282
 283         dprintk(("interrupt stat 0x%x int 0x%x\n", stat, intr));
 284
 285         incnt = txn->inbits;
 286         outcnt = txn->outbits;
 287         byte = (txn->opcode << 8);
 288         WRITEUCTLDATA(byte);
 289
 290         bytecnt = 0;
 291         while (incnt > 0) {
 292                 byte = (txn->inbuf[bytecnt] << 8);
 293                 WRITEUCTLDATA(byte);
 294                 incnt--;
 295                 bytecnt++;
 296         }
 297
 298         /* Get the ack */
 299         READUCTLDATA(byte);
 300         dprintk(("ack was %x\n", (byte >> 8)));
 301
 302         bytecnt = 0;
 303         while (outcnt > 0) {
 304                 READUCTLDATA(byte);
 305                 txn->outbuf[bytecnt] = (byte >> 8);
 306                 dprintk(("set byte to %02x\n", byte));
 307                 outcnt--;
 308                 bytecnt++;
 309         }
 310 }
 311
 312 void uctrl_get_event_status(void)
 313 {
 314         struct uctrl_driver *driver = &drv;
 315         struct uctrl_txn txn;
 316         u8 outbits[2];
 317
 318         txn.opcode = READ_EVENT_STATUS;
 319         txn.inbits = 0;
 320         txn.outbits = 2;
 321         txn.inbuf = NULL;
 322         txn.outbuf = outbits;
 323
 324         uctrl_do_txn(&txn);
 325
 326         dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
 327         driver->status.event_status =
 328                 ((outbits[0] & 0xff) << 8) | (outbits[1] & 0xff);
 329         dprintk(("ev is %x\n", driver->status.event_status));
 330 }
 331
 332 void uctrl_get_external_status(void)
 333 {
 334         struct uctrl_driver *driver = &drv;
 335         struct uctrl_txn txn;
 336         u8 outbits[2];
 337         int i, v;
 338
 339         txn.opcode = READ_EXTERNAL_STATUS;
 340         txn.inbits = 0;
 341         txn.outbits = 2;
 342         txn.inbuf = NULL;
 343         txn.outbuf = outbits;
 344
 345         uctrl_do_txn(&txn);
 346
 347         dprintk(("bytes %x %x\n", (outbits[0] & 0xff), (outbits[1] & 0xff)));
 348         driver->status.external_status =
 349                 ((outbits[0] * 256) + (outbits[1]));
 350         dprintk(("ex is %x\n", driver->status.external_status));
 351         v = driver->status.external_status;
 352         for (i = 0; v != 0; i++, v >>= 1) {
 353                 if (v & 1) {
 354                         dprintk(("%s%s", " ", uctrl_extstatus[i]));
 355                 }
 356         }
 357         dprintk(("\n"));
 358
 359 }
 360
 361 static int __init ts102_uctrl_init(void)
 362 {
 363         struct uctrl_driver *driver = &drv;
 364         int len, i;
 365         struct linux_prom_irqs tmp_irq[2];
 366         unsigned int vaddr[2] = { 0, 0 };
 367         int tmpnode, uctrlnode = prom_getchild(prom_root_node);
 368
 369         tmpnode = prom_searchsiblings(uctrlnode, "obio");
 370
 371         if (tmpnode)
 372           uctrlnode = prom_getchild(tmpnode);
 373
 374         uctrlnode = prom_searchsiblings(uctrlnode, "uctrl");
 375
 376         if (!uctrlnode)
 377                 return -ENODEV;
 378
 379         /* the prom mapped it for us */
 380         len = prom_getproperty(uctrlnode, "address", (void *) vaddr,
 381                                sizeof(vaddr));
 382         driver->regs = (struct uctrl_regs *)vaddr[0];
 383
 384         len = prom_getproperty(uctrlnode, "intr", (char *) tmp_irq,
 385                                sizeof(tmp_irq));
 386
 387         /* Flush device */
 388         READUCTLDATA(len);
 389
 390         if(!driver->irq)
 391                 driver->irq = tmp_irq[0].pri;
 392
 393         request_irq(driver->irq, uctrl_interrupt, 0, "uctrl", driver);
 394
 395         if (misc_register(&uctrl_dev)) {
 396                 printk("%s: unable to get misc minor %d\n",
 397                        __FUNCTION__, uctrl_dev.minor);
 398                 free_irq(driver->irq, driver);
 399                 return -ENODEV;
 400         }
 401
 402         driver->regs->uctrl_intr = UCTRL_INTR_RXNE_REQ|UCTRL_INTR_RXNE_MSK;
 403         printk("uctrl: 0x%x (irq %d)\n", driver->regs, driver->irq);
 404         uctrl_get_event_status();
 405         uctrl_get_external_status();
 406         return 0;
 407 }
 408
 409 static void __exit ts102_uctrl_cleanup(void)
 410 {
 411         struct uctrl_driver *driver = &drv;
 412
 413         misc_deregister(&uctrl_dev);
 414         if (driver->irq)
 415                 free_irq(driver->irq, driver);
 416         if (driver->regs)
 417                 driver->regs = NULL;
 418 }
 419
 420 module_init(ts102_uctrl_init);
 421 module_exit(ts102_uctrl_cleanup);
 422 MODULE_LICENSE("GPL");