kernel/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                         mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC);
 110         }
 111
 112         return 0;
 113 }
 114
 115 struct sfi_timer_table_entry *sfi_get_mtmr(int hint)
 116 {
 117         int i;
 118         if (hint < sfi_mtimer_num) {
 119                 if (!sfi_mtimer_usage[hint]) {
 120                         pr_debug("hint taken for timer %d irq %d\n",
 121                                 hint, sfi_mtimer_array[hint].irq);
 122                         sfi_mtimer_usage[hint] = 1;
 123                         return &sfi_mtimer_array[hint];
 124                 }
 125         }
 126         /* take the first timer available */
 127         for (i = 0; i < sfi_mtimer_num;) {
 128                 if (!sfi_mtimer_usage[i]) {
 129                         sfi_mtimer_usage[i] = 1;
 130                         return &sfi_mtimer_array[i];
 131                 }
 132                 i++;
 133         }
 134         return NULL;
 135 }
 136
 137 void sfi_free_mtmr(struct sfi_timer_table_entry *mtmr)
 138 {
 139         int i;
 140         for (i = 0; i < sfi_mtimer_num;) {
 141                 if (mtmr->irq == sfi_mtimer_array[i].irq) {
 142                         sfi_mtimer_usage[i] = 0;
 143                         return;
 144                 }
 145                 i++;
 146         }
 147 }
 148
 149 /* parse all the mrtc info to a global mrtc array */
 150 int __init sfi_parse_mrtc(struct sfi_table_header *table)
 151 {
 152         struct sfi_table_simple *sb;
 153         struct sfi_rtc_table_entry *pentry;
 154         struct mpc_intsrc mp_irq;
 155
 156         int totallen;
 157
 158         sb = (struct sfi_table_simple *)table;
 159         if (!sfi_mrtc_num) {
 160                 sfi_mrtc_num = SFI_GET_NUM_ENTRIES(sb,
 161                                                 struct sfi_rtc_table_entry);
 162                 pentry = (struct sfi_rtc_table_entry *)sb->pentry;
 163                 totallen = sfi_mrtc_num * sizeof(*pentry);
 164                 memcpy(sfi_mrtc_array, pentry, totallen);
 165         }
 166
 167         pr_debug("SFI RTC info (num = %d):\n", sfi_mrtc_num);
 168         pentry = sfi_mrtc_array;
 169         for (totallen = 0; totallen < sfi_mrtc_num; totallen++, pentry++) {
 170                 pr_debug("RTC[%d]: paddr = 0x%08x, irq = %d\n",
 171                         totallen, (u32)pentry->phys_addr, pentry->irq);
 172                 mp_irq.type = MP_INTSRC;
 173                 mp_irq.irqtype = mp_INT;
 174                 mp_irq.irqflag = 0xf;   /* level trigger and active low */
 175                 mp_irq.srcbus = MP_BUS_ISA;
 176                 mp_irq.srcbusirq = pentry->irq; /* IRQ */
 177                 mp_irq.dstapic = MP_APIC_ALL;
 178                 mp_irq.dstirq = pentry->irq;
 179                 mp_save_irq(&mp_irq);
 180                 mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC);
 181         }
 182         return 0;
 183 }
 184
 185
 186 /*
 187  * Parsing GPIO table first, since the DEVS table will need this table
 188  * to map the pin name to the actual pin.
 189  */
 190 static int __init sfi_parse_gpio(struct sfi_table_header *table)
 191 {
 192         struct sfi_table_simple *sb;
 193         struct sfi_gpio_table_entry *pentry;
 194         int num, i;
 195
 196         if (gpio_table)
 197                 return 0;
 198         sb = (struct sfi_table_simple *)table;
 199         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_gpio_table_entry);
 200         pentry = (struct sfi_gpio_table_entry *)sb->pentry;
 201
 202         gpio_table = kmalloc(num * sizeof(*pentry), GFP_KERNEL);
 203         if (!gpio_table)
 204                 return -1;
 205         memcpy(gpio_table, pentry, num * sizeof(*pentry));
 206         gpio_num_entry = num;
 207
 208         pr_debug("GPIO pin info:\n");
 209         for (i = 0; i < num; i++, pentry++)
 210                 pr_debug("info[%2d]: controller = %16.16s, pin_name = %16.16s,"
 211                 " pin = %d\n", i,
 212                         pentry->controller_name,
 213                         pentry->pin_name,
 214                         pentry->pin_no);
 215         return 0;
 216 }
 217
 218 int get_gpio_by_name(const char *name)
 219 {
 220         struct sfi_gpio_table_entry *pentry = gpio_table;
 221         int i;
 222
 223         if (!pentry)
 224                 return -1;
 225         for (i = 0; i < gpio_num_entry; i++, pentry++) {
 226                 if (!strncmp(name, pentry->pin_name, SFI_NAME_LEN))
 227                         return pentry->pin_no;
 228         }
 229         return -EINVAL;
 230 }
 231
 232 void __init intel_scu_device_register(struct platform_device *pdev)
 233 {
 234         if (ipc_next_dev == MAX_IPCDEVS)
 235                 pr_err("too many SCU IPC devices");
 236         else
 237                 ipc_devs[ipc_next_dev++] = pdev;
 238 }
 239
 240 static void __init intel_scu_spi_device_register(struct spi_board_info *sdev)
 241 {
 242         struct spi_board_info *new_dev;
 243
 244         if (spi_next_dev == MAX_SCU_SPI) {
 245                 pr_err("too many SCU SPI devices");
 246                 return;
 247         }
 248
 249         new_dev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 250         if (!new_dev) {
 251                 pr_err("failed to alloc mem for delayed spi dev %s\n",
 252                         sdev->modalias);
 253                 return;
 254         }
 255         *new_dev = *sdev;
 256
 257         spi_devs[spi_next_dev++] = new_dev;
 258 }
 259
 260 static void __init intel_scu_i2c_device_register(int bus,
 261                                                 struct i2c_board_info *idev)
 262 {
 263         struct i2c_board_info *new_dev;
 264
 265         if (i2c_next_dev == MAX_SCU_I2C) {
 266                 pr_err("too many SCU I2C devices");
 267                 return;
 268         }
 269
 270         new_dev = kzalloc(sizeof(*idev), GFP_KERNEL);
 271         if (!new_dev) {
 272                 pr_err("failed to alloc mem for delayed i2c dev %s\n",
 273                         idev->type);
 274                 return;
 275         }
 276         *new_dev = *idev;
 277
 278         i2c_bus[i2c_next_dev] = bus;
 279         i2c_devs[i2c_next_dev++] = new_dev;
 280 }
 281
 282 /* Called by IPC driver */
 283 void intel_scu_devices_create(void)
 284 {
 285         int i;
 286
 287         for (i = 0; i < ipc_next_dev; i++)
 288                 platform_device_add(ipc_devs[i]);
 289
 290         for (i = 0; i < spi_next_dev; i++)
 291                 spi_register_board_info(spi_devs[i], 1);
 292
 293         for (i = 0; i < i2c_next_dev; i++) {
 294                 struct i2c_adapter *adapter;
 295                 struct i2c_client *client;
 296
 297                 adapter = i2c_get_adapter(i2c_bus[i]);
 298                 if (adapter) {
 299                         client = i2c_new_device(adapter, i2c_devs[i]);
 300                         if (!client)
 301                                 pr_err("can't create i2c device %s\n",
 302                                         i2c_devs[i]->type);
 303                 } else
 304                         i2c_register_board_info(i2c_bus[i], i2c_devs[i], 1);
 305         }
 306         intel_scu_notifier_post(SCU_AVAILABLE, NULL);
 307 }
 308 EXPORT_SYMBOL_GPL(intel_scu_devices_create);
 309
 310 /* Called by IPC driver */
 311 void intel_scu_devices_destroy(void)
 312 {
 313         int i;
 314
 315         intel_scu_notifier_post(SCU_DOWN, NULL);
 316
 317         for (i = 0; i < ipc_next_dev; i++)
 318                 platform_device_del(ipc_devs[i]);
 319 }
 320 EXPORT_SYMBOL_GPL(intel_scu_devices_destroy);
 321
 322 static void __init install_irq_resource(struct platform_device *pdev, int irq)
 323 {
 324         /* Single threaded */
 325         static struct resource res __initdata = {
 326                 .name = "IRQ",
 327                 .flags = IORESOURCE_IRQ,
 328         };
 329         res.start = irq;
 330         platform_device_add_resources(pdev, &res, 1);
 331 }
 332
 333 static void __init sfi_handle_ipc_dev(struct sfi_device_table_entry *pentry,
 334                                         struct devs_id *dev)
 335 {
 336         struct platform_device *pdev;
 337         void *pdata = NULL;
 338
 339         pr_debug("IPC bus, name = %16.16s, irq = 0x%2x\n",
 340                 pentry->name, pentry->irq);
 341         pdata = intel_mid_sfi_get_pdata(dev, pentry);
 342         if (IS_ERR(pdata))
 343                 return;
 344
 345         pdev = platform_device_alloc(pentry->name, 0);
 346         if (pdev == NULL) {
 347                 pr_err("out of memory for SFI platform device '%s'.\n",
 348                         pentry->name);
 349                 return;
 350         }
 351         install_irq_resource(pdev, pentry->irq);
 352
 353         pdev->dev.platform_data = pdata;
 354         platform_device_add(pdev);
 355 }
 356
 357 static void __init sfi_handle_spi_dev(struct sfi_device_table_entry *pentry,
 358                                         struct devs_id *dev)
 359 {
 360         struct spi_board_info spi_info;
 361         void *pdata = NULL;
 362
 363         memset(&spi_info, 0, sizeof(spi_info));
 364         strncpy(spi_info.modalias, pentry->name, SFI_NAME_LEN);
 365         spi_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
 366         spi_info.bus_num = pentry->host_num;
 367         spi_info.chip_select = pentry->addr;
 368         spi_info.max_speed_hz = pentry->max_freq;
 369         pr_debug("SPI bus=%d, name=%16.16s, irq=0x%2x, max_freq=%d, cs=%d\n",
 370                 spi_info.bus_num,
 371                 spi_info.modalias,
 372                 spi_info.irq,
 373                 spi_info.max_speed_hz,
 374                 spi_info.chip_select);
 375
 376         pdata = intel_mid_sfi_get_pdata(dev, &spi_info);
 377         if (IS_ERR(pdata))
 378                 return;
 379
 380         spi_info.platform_data = pdata;
 381         if (dev->delay)
 382                 intel_scu_spi_device_register(&spi_info);
 383         else
 384                 spi_register_board_info(&spi_info, 1);
 385 }
 386
 387 static void __init sfi_handle_i2c_dev(struct sfi_device_table_entry *pentry,
 388                                         struct devs_id *dev)
 389 {
 390         struct i2c_board_info i2c_info;
 391         void *pdata = NULL;
 392
 393         memset(&i2c_info, 0, sizeof(i2c_info));
 394         strncpy(i2c_info.type, pentry->name, SFI_NAME_LEN);
 395         i2c_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
 396         i2c_info.addr = pentry->addr;
 397         pr_debug("I2C bus = %d, name = %16.16s, irq = 0x%2x, addr = 0x%x\n",
 398                 pentry->host_num,
 399                 i2c_info.type,
 400                 i2c_info.irq,
 401                 i2c_info.addr);
 402         pdata = intel_mid_sfi_get_pdata(dev, &i2c_info);
 403         i2c_info.platform_data = pdata;
 404         if (IS_ERR(pdata))
 405                 return;
 406
 407         if (dev->delay)
 408                 intel_scu_i2c_device_register(pentry->host_num, &i2c_info);
 409         else
 410                 i2c_register_board_info(pentry->host_num, &i2c_info, 1);
 411 }
 412
 413 extern struct devs_id *const __x86_intel_mid_dev_start[],
 414                       *const __x86_intel_mid_dev_end[];
 415
 416 static struct devs_id __init *get_device_id(u8 type, char *name)
 417 {
 418         struct devs_id *const *dev_table;
 419
 420         for (dev_table = __x86_intel_mid_dev_start;
 421                         dev_table < __x86_intel_mid_dev_end; dev_table++) {
 422                 struct devs_id *dev = *dev_table;
 423                 if (dev->type == type &&
 424                         !strncmp(dev->name, name, SFI_NAME_LEN)) {
 425                         return dev;
 426                 }
 427         }
 428
 429         return NULL;
 430 }
 431
 432 static int __init sfi_parse_devs(struct sfi_table_header *table)
 433 {
 434         struct sfi_table_simple *sb;
 435         struct sfi_device_table_entry *pentry;
 436         struct devs_id *dev = NULL;
 437         int num, i, ret;
 438         int polarity;
 439
 440         sb = (struct sfi_table_simple *)table;
 441         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_device_table_entry);
 442         pentry = (struct sfi_device_table_entry *)sb->pentry;
 443
 444         for (i = 0; i < num; i++, pentry++) {
 445                 int irq = pentry->irq;
 446
 447                 if (irq != (u8)0xff) { /* native RTE case */
 448                         /* these SPI2 devices are not exposed to system as PCI
 449                          * devices, but they have separate RTE entry in IOAPIC
 450                          * so we have to enable them one by one here
 451                          */
 452                         if (intel_mid_identify_cpu() ==
 453                                         INTEL_MID_CPU_CHIP_TANGIER) {
 454                                 if (!strncmp(pentry->name, "r69001-ts-i2c", 13))
 455                                         /* active low */
 456                                         polarity = 1;
 457                                 else if (!strncmp(pentry->name,
 458                                                 "synaptics_3202", 14))
 459                                         /* active low */
 460                                         polarity = 1;
 461                                 else if (irq == 41)
 462                                         /* fast_int_1 */
 463                                         polarity = 1;
 464                                 else
 465                                         /* active high */
 466                                         polarity = 0;
 467                         } else {
 468                                 /* PNW and CLV go with active low */
 469                                 polarity = 1;
 470                         }
 471
 472                         ret = mp_set_gsi_attr(irq, 1, polarity, NUMA_NO_NODE);
 473                         if (ret == 0)
 474                                 ret = mp_map_gsi_to_irq(irq, IOAPIC_MAP_ALLOC);
 475                         WARN_ON(ret < 0);
 476                 }
 477
 478                 dev = get_device_id(pentry->type, pentry->name);
 479
 480                 if (!dev)
 481                         continue;
 482
 483                 if (dev->device_handler) {
 484                         dev->device_handler(pentry, dev);
 485                 } else {
 486                         switch (pentry->type) {
 487                         case SFI_DEV_TYPE_IPC:
 488                                 sfi_handle_ipc_dev(pentry, dev);
 489                                 break;
 490                         case SFI_DEV_TYPE_SPI:
 491                                 sfi_handle_spi_dev(pentry, dev);
 492                                 break;
 493                         case SFI_DEV_TYPE_I2C:
 494                                 sfi_handle_i2c_dev(pentry, dev);
 495                                 break;
 496                         case SFI_DEV_TYPE_UART:
 497                         case SFI_DEV_TYPE_HSI:
 498                         default:
 499                                 break;
 500                         }
 501                 }
 502         }
 503         return 0;
 504 }
 505
 506 static int __init intel_mid_platform_init(void)
 507 {
 508         sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, sfi_parse_gpio);
 509         sfi_table_parse(SFI_SIG_DEVS, NULL, NULL, sfi_parse_devs);
 510         return 0;
 511 }
 512 arch_initcall(intel_mid_platform_init);