arch/x86/platform/intel-mid/sfi.c

   1 /*
   2  * intel_mid_sfi.c: Intel MID SFI initialization code
   3  *
   4  * (C) Copyright 2013 Intel Corporation
   5  * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; version 2
  10  * of the License.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/scatterlist.h>
  17 #include <linux/sfi.h>
  18 #include <linux/intel_pmic_gpio.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/i2c.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/gpio.h>
  23 #include <linux/gpio_keys.h>
  24 #include <linux/input.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/irq.h>
  27 #include <linux/module.h>
  28 #include <linux/notifier.h>
  29 #include <linux/mmc/core.h>
  30 #include <linux/mmc/card.h>
  31 #include <linux/blkdev.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/mpspec_def.h>
  35 #include <asm/hw_irq.h>
  36 #include <asm/apic.h>
  37 #include <asm/io_apic.h>
  38 #include <asm/intel-mid.h>
  39 #include <asm/intel_mid_vrtc.h>
  40 #include <asm/io.h>
  41 #include <asm/i8259.h>
  42 #include <asm/intel_scu_ipc.h>
  43 #include <asm/apb_timer.h>
  44 #include <asm/reboot.h>
  45
  46 #define SFI_SIG_OEM0    "OEM0"
  47 #define MAX_IPCDEVS     24
  48 #define MAX_SCU_SPI     24
  49 #define MAX_SCU_I2C     24
  50
  51 static struct platform_device *ipc_devs[MAX_IPCDEVS];
  52 static struct spi_board_info *spi_devs[MAX_SCU_SPI];
  53 static struct i2c_board_info *i2c_devs[MAX_SCU_I2C];
  54 static struct sfi_gpio_table_entry *gpio_table;
  55 static struct sfi_timer_table_entry sfi_mtimer_array[SFI_MTMR_MAX_NUM];
  56 static int ipc_next_dev;
  57 static int spi_next_dev;
  58 static int i2c_next_dev;
  59 static int i2c_bus[MAX_SCU_I2C];
  60 static int gpio_num_entry;
  61 static u32 sfi_mtimer_usage[SFI_MTMR_MAX_NUM];
  62 int sfi_mrtc_num;
  63 int sfi_mtimer_num;
  64
  65 struct sfi_rtc_table_entry sfi_mrtc_array[SFI_MRTC_MAX];
  66 EXPORT_SYMBOL_GPL(sfi_mrtc_array);
  67
  68 struct blocking_notifier_head intel_scu_notifier =
  69                         BLOCKING_NOTIFIER_INIT(intel_scu_notifier);
  70 EXPORT_SYMBOL_GPL(intel_scu_notifier);
  71
  72 #define intel_mid_sfi_get_pdata(dev, priv)      \
  73         ((dev)->get_platform_data ? (dev)->get_platform_data(priv) : NULL)
  74
  75 /* parse all the mtimer info to a static mtimer array */
  76 int __init sfi_parse_mtmr(struct sfi_table_header *table)
  77 {
  78         struct sfi_table_simple *sb;
  79         struct sfi_timer_table_entry *pentry;
  80         struct mpc_intsrc mp_irq;
  81         int totallen;
  82
  83         sb = (struct sfi_table_simple *)table;
  84         if (!sfi_mtimer_num) {
  85                 sfi_mtimer_num = SFI_GET_NUM_ENTRIES(sb,
  86                                         struct sfi_timer_table_entry);
  87                 pentry = (struct sfi_timer_table_entry *) sb->pentry;
  88                 totallen = sfi_mtimer_num * sizeof(*pentry);
  89                 memcpy(sfi_mtimer_array, pentry, totallen);
  90         }
  91
  92         pr_debug("SFI MTIMER info (num = %d):\n", sfi_mtimer_num);
  93         pentry = sfi_mtimer_array;
  94         for (totallen = 0; totallen < sfi_mtimer_num; totallen++, pentry++) {
  95                 pr_debug("timer[%d]: paddr = 0x%08x, freq = %dHz, irq = %d\n",
  96                         totallen, (u32)pentry->phys_addr,
  97                         pentry->freq_hz, pentry->irq);
  98                         if (!pentry->irq)
  99                                 continue;
 100                         mp_irq.type = MP_INTSRC;
 101                         mp_irq.irqtype = mp_INT;
 102 /* triggering mode edge bit 2-3, active high polarity bit 0-1 */
 103                         mp_irq.irqflag = 5;
 104                         mp_irq.srcbus = MP_BUS_ISA;
 105                         mp_irq.srcbusirq = pentry->irq; /* IRQ */
 106                         mp_irq.dstapic = MP_APIC_ALL;
 107                         mp_irq.dstirq = pentry->irq;
 108                         mp_save_irq(&mp_irq);
 109         }
 110
 111         return 0;
 112 }
 113
 114 struct sfi_timer_table_entry *sfi_get_mtmr(int hint)
 115 {
 116         int i;
 117         if (hint < sfi_mtimer_num) {
 118                 if (!sfi_mtimer_usage[hint]) {
 119                         pr_debug("hint taken for timer %d irq %d\n",
 120                                 hint, sfi_mtimer_array[hint].irq);
 121                         sfi_mtimer_usage[hint] = 1;
 122                         return &sfi_mtimer_array[hint];
 123                 }
 124         }
 125         /* take the first timer available */
 126         for (i = 0; i < sfi_mtimer_num;) {
 127                 if (!sfi_mtimer_usage[i]) {
 128                         sfi_mtimer_usage[i] = 1;
 129                         return &sfi_mtimer_array[i];
 130                 }
 131                 i++;
 132         }
 133         return NULL;
 134 }
 135
 136 void sfi_free_mtmr(struct sfi_timer_table_entry *mtmr)
 137 {
 138         int i;
 139         for (i = 0; i < sfi_mtimer_num;) {
 140                 if (mtmr->irq == sfi_mtimer_array[i].irq) {
 141                         sfi_mtimer_usage[i] = 0;
 142                         return;
 143                 }
 144                 i++;
 145         }
 146 }
 147
 148 /* parse all the mrtc info to a global mrtc array */
 149 int __init sfi_parse_mrtc(struct sfi_table_header *table)
 150 {
 151         struct sfi_table_simple *sb;
 152         struct sfi_rtc_table_entry *pentry;
 153         struct mpc_intsrc mp_irq;
 154
 155         int totallen;
 156
 157         sb = (struct sfi_table_simple *)table;
 158         if (!sfi_mrtc_num) {
 159                 sfi_mrtc_num = SFI_GET_NUM_ENTRIES(sb,
 160                                                 struct sfi_rtc_table_entry);
 161                 pentry = (struct sfi_rtc_table_entry *)sb->pentry;
 162                 totallen = sfi_mrtc_num * sizeof(*pentry);
 163                 memcpy(sfi_mrtc_array, pentry, totallen);
 164         }
 165
 166         pr_debug("SFI RTC info (num = %d):\n", sfi_mrtc_num);
 167         pentry = sfi_mrtc_array;
 168         for (totallen = 0; totallen < sfi_mrtc_num; totallen++, pentry++) {
 169                 pr_debug("RTC[%d]: paddr = 0x%08x, irq = %d\n",
 170                         totallen, (u32)pentry->phys_addr, pentry->irq);
 171                 mp_irq.type = MP_INTSRC;
 172                 mp_irq.irqtype = mp_INT;
 173                 mp_irq.irqflag = 0xf;   /* level trigger and active low */
 174                 mp_irq.srcbus = MP_BUS_ISA;
 175                 mp_irq.srcbusirq = pentry->irq; /* IRQ */
 176                 mp_irq.dstapic = MP_APIC_ALL;
 177                 mp_irq.dstirq = pentry->irq;
 178                 mp_save_irq(&mp_irq);
 179         }
 180         return 0;
 181 }
 182
 183
 184 /*
 185  * Parsing GPIO table first, since the DEVS table will need this table
 186  * to map the pin name to the actual pin.
 187  */
 188 static int __init sfi_parse_gpio(struct sfi_table_header *table)
 189 {
 190         struct sfi_table_simple *sb;
 191         struct sfi_gpio_table_entry *pentry;
 192         int num, i;
 193
 194         if (gpio_table)
 195                 return 0;
 196         sb = (struct sfi_table_simple *)table;
 197         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_gpio_table_entry);
 198         pentry = (struct sfi_gpio_table_entry *)sb->pentry;
 199
 200         gpio_table = kmalloc(num * sizeof(*pentry), GFP_KERNEL);
 201         if (!gpio_table)
 202                 return -1;
 203         memcpy(gpio_table, pentry, num * sizeof(*pentry));
 204         gpio_num_entry = num;
 205
 206         pr_debug("GPIO pin info:\n");
 207         for (i = 0; i < num; i++, pentry++)
 208                 pr_debug("info[%2d]: controller = %16.16s, pin_name = %16.16s,"
 209                 " pin = %d\n", i,
 210                         pentry->controller_name,
 211                         pentry->pin_name,
 212                         pentry->pin_no);
 213         return 0;
 214 }
 215
 216 int get_gpio_by_name(const char *name)
 217 {
 218         struct sfi_gpio_table_entry *pentry = gpio_table;
 219         int i;
 220
 221         if (!pentry)
 222                 return -1;
 223         for (i = 0; i < gpio_num_entry; i++, pentry++) {
 224                 if (!strncmp(name, pentry->pin_name, SFI_NAME_LEN))
 225                         return pentry->pin_no;
 226         }
 227         return -1;
 228 }
 229
 230 void __init intel_scu_device_register(struct platform_device *pdev)
 231 {
 232         if (ipc_next_dev == MAX_IPCDEVS)
 233                 pr_err("too many SCU IPC devices");
 234         else
 235                 ipc_devs[ipc_next_dev++] = pdev;
 236 }
 237
 238 static void __init intel_scu_spi_device_register(struct spi_board_info *sdev)
 239 {
 240         struct spi_board_info *new_dev;
 241
 242         if (spi_next_dev == MAX_SCU_SPI) {
 243                 pr_err("too many SCU SPI devices");
 244                 return;
 245         }
 246
 247         new_dev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 248         if (!new_dev) {
 249                 pr_err("failed to alloc mem for delayed spi dev %s\n",
 250                         sdev->modalias);
 251                 return;
 252         }
 253         memcpy(new_dev, sdev, sizeof(*sdev));
 254
 255         spi_devs[spi_next_dev++] = new_dev;
 256 }
 257
 258 static void __init intel_scu_i2c_device_register(int bus,
 259                                                 struct i2c_board_info *idev)
 260 {
 261         struct i2c_board_info *new_dev;
 262
 263         if (i2c_next_dev == MAX_SCU_I2C) {
 264                 pr_err("too many SCU I2C devices");
 265                 return;
 266         }
 267
 268         new_dev = kzalloc(sizeof(*idev), GFP_KERNEL);
 269         if (!new_dev) {
 270                 pr_err("failed to alloc mem for delayed i2c dev %s\n",
 271                         idev->type);
 272                 return;
 273         }
 274         memcpy(new_dev, idev, sizeof(*idev));
 275
 276         i2c_bus[i2c_next_dev] = bus;
 277         i2c_devs[i2c_next_dev++] = new_dev;
 278 }
 279
 280 /* Called by IPC driver */
 281 void intel_scu_devices_create(void)
 282 {
 283         int i;
 284
 285         for (i = 0; i < ipc_next_dev; i++)
 286                 platform_device_add(ipc_devs[i]);
 287
 288         for (i = 0; i < spi_next_dev; i++)
 289                 spi_register_board_info(spi_devs[i], 1);
 290
 291         for (i = 0; i < i2c_next_dev; i++) {
 292                 struct i2c_adapter *adapter;
 293                 struct i2c_client *client;
 294
 295                 adapter = i2c_get_adapter(i2c_bus[i]);
 296                 if (adapter) {
 297                         client = i2c_new_device(adapter, i2c_devs[i]);
 298                         if (!client)
 299                                 pr_err("can't create i2c device %s\n",
 300                                         i2c_devs[i]->type);
 301                 } else
 302                         i2c_register_board_info(i2c_bus[i], i2c_devs[i], 1);
 303         }
 304         intel_scu_notifier_post(SCU_AVAILABLE, NULL);
 305 }
 306 EXPORT_SYMBOL_GPL(intel_scu_devices_create);
 307
 308 /* Called by IPC driver */
 309 void intel_scu_devices_destroy(void)
 310 {
 311         int i;
 312
 313         intel_scu_notifier_post(SCU_DOWN, NULL);
 314
 315         for (i = 0; i < ipc_next_dev; i++)
 316                 platform_device_del(ipc_devs[i]);
 317 }
 318 EXPORT_SYMBOL_GPL(intel_scu_devices_destroy);
 319
 320 static void __init install_irq_resource(struct platform_device *pdev, int irq)
 321 {
 322         /* Single threaded */
 323         static struct resource res __initdata = {
 324                 .name = "IRQ",
 325                 .flags = IORESOURCE_IRQ,
 326         };
 327         res.start = irq;
 328         platform_device_add_resources(pdev, &res, 1);
 329 }
 330
 331 static void __init sfi_handle_ipc_dev(struct sfi_device_table_entry *pentry,
 332                                         struct devs_id *dev)
 333 {
 334         struct platform_device *pdev;
 335         void *pdata = NULL;
 336
 337         pr_debug("IPC bus, name = %16.16s, irq = 0x%2x\n",
 338                 pentry->name, pentry->irq);
 339         pdata = intel_mid_sfi_get_pdata(dev, pentry);
 340
 341         pdev = platform_device_alloc(pentry->name, 0);
 342         if (pdev == NULL) {
 343                 pr_err("out of memory for SFI platform device '%s'.\n",
 344                         pentry->name);
 345                 return;
 346         }
 347         install_irq_resource(pdev, pentry->irq);
 348
 349         pdev->dev.platform_data = pdata;
 350         platform_device_add(pdev);
 351 }
 352
 353 static void __init sfi_handle_spi_dev(struct sfi_device_table_entry *pentry,
 354                                         struct devs_id *dev)
 355 {
 356         struct spi_board_info spi_info;
 357         void *pdata = NULL;
 358
 359         memset(&spi_info, 0, sizeof(spi_info));
 360         strncpy(spi_info.modalias, pentry->name, SFI_NAME_LEN);
 361         spi_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
 362         spi_info.bus_num = pentry->host_num;
 363         spi_info.chip_select = pentry->addr;
 364         spi_info.max_speed_hz = pentry->max_freq;
 365         pr_debug("SPI bus=%d, name=%16.16s, irq=0x%2x, max_freq=%d, cs=%d\n",
 366                 spi_info.bus_num,
 367                 spi_info.modalias,
 368                 spi_info.irq,
 369                 spi_info.max_speed_hz,
 370                 spi_info.chip_select);
 371
 372         pdata = intel_mid_sfi_get_pdata(dev, &spi_info);
 373
 374         spi_info.platform_data = pdata;
 375         if (dev->delay)
 376                 intel_scu_spi_device_register(&spi_info);
 377         else
 378                 spi_register_board_info(&spi_info, 1);
 379 }
 380
 381 static void __init sfi_handle_i2c_dev(struct sfi_device_table_entry *pentry,
 382                                         struct devs_id *dev)
 383 {
 384         struct i2c_board_info i2c_info;
 385         void *pdata = NULL;
 386
 387         memset(&i2c_info, 0, sizeof(i2c_info));
 388         strncpy(i2c_info.type, pentry->name, SFI_NAME_LEN);
 389         i2c_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
 390         i2c_info.addr = pentry->addr;
 391         pr_debug("I2C bus = %d, name = %16.16s, irq = 0x%2x, addr = 0x%x\n",
 392                 pentry->host_num,
 393                 i2c_info.type,
 394                 i2c_info.irq,
 395                 i2c_info.addr);
 396         pdata = intel_mid_sfi_get_pdata(dev, &i2c_info);
 397         i2c_info.platform_data = pdata;
 398
 399         if (dev->delay)
 400                 intel_scu_i2c_device_register(pentry->host_num, &i2c_info);
 401         else
 402                 i2c_register_board_info(pentry->host_num, &i2c_info, 1);
 403 }
 404
 405 extern struct devs_id *const __x86_intel_mid_dev_start[],
 406                       *const __x86_intel_mid_dev_end[];
 407
 408 static struct devs_id __init *get_device_id(u8 type, char *name)
 409 {
 410         struct devs_id *const *dev_table;
 411
 412         for (dev_table = __x86_intel_mid_dev_start;
 413                         dev_table < __x86_intel_mid_dev_end; dev_table++) {
 414                 struct devs_id *dev = *dev_table;
 415                 if (dev->type == type &&
 416                         !strncmp(dev->name, name, SFI_NAME_LEN)) {
 417                         return dev;
 418                 }
 419         }
 420
 421         return NULL;
 422 }
 423
 424 static int __init sfi_parse_devs(struct sfi_table_header *table)
 425 {
 426         struct sfi_table_simple *sb;
 427         struct sfi_device_table_entry *pentry;
 428         struct devs_id *dev = NULL;
 429         int num, i;
 430         int ioapic;
 431         struct io_apic_irq_attr irq_attr;
 432
 433         sb = (struct sfi_table_simple *)table;
 434         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_device_table_entry);
 435         pentry = (struct sfi_device_table_entry *)sb->pentry;
 436
 437         for (i = 0; i < num; i++, pentry++) {
 438                 int irq = pentry->irq;
 439
 440                 if (irq != (u8)0xff) { /* native RTE case */
 441                         /* these SPI2 devices are not exposed to system as PCI
 442                          * devices, but they have separate RTE entry in IOAPIC
 443                          * so we have to enable them one by one here
 444                          */
 445                         ioapic = mp_find_ioapic(irq);
 446                         irq_attr.ioapic = ioapic;
 447                         irq_attr.ioapic_pin = irq;
 448                         irq_attr.trigger = 1;
 449                         irq_attr.polarity = 1;
 450                         io_apic_set_pci_routing(NULL, irq, &irq_attr);
 451                 } else
 452                         irq = 0; /* No irq */
 453
 454                 dev = get_device_id(pentry->type, pentry->name);
 455
 456                 if (!dev)
 457                         continue;
 458
 459                 if (dev->device_handler) {
 460                         dev->device_handler(pentry, dev);
 461                 } else {
 462                         switch (pentry->type) {
 463                         case SFI_DEV_TYPE_IPC:
 464                                 sfi_handle_ipc_dev(pentry, dev);
 465                                 break;
 466                         case SFI_DEV_TYPE_SPI:
 467                                 sfi_handle_spi_dev(pentry, dev);
 468                                 break;
 469                         case SFI_DEV_TYPE_I2C:
 470                                 sfi_handle_i2c_dev(pentry, dev);
 471                                 break;
 472                         case SFI_DEV_TYPE_UART:
 473                         case SFI_DEV_TYPE_HSI:
 474                         default:
 475                                 break;
 476                         }
 477                 }
 478         }
 479         return 0;
 480 }
 481
 482 static int __init intel_mid_platform_init(void)
 483 {
 484         sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, sfi_parse_gpio);
 485         sfi_table_parse(SFI_SIG_DEVS, NULL, NULL, sfi_parse_devs);
 486         return 0;
 487 }
 488 arch_initcall(intel_mid_platform_init);