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/spi/spi.h>
  19 #include <linux/i2c.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/gpio.h>
  22 #include <linux/gpio_keys.h>
  23 #include <linux/input.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/irq.h>
  26 #include <linux/export.h>
  27 #include <linux/notifier.h>
  28 #include <linux/mmc/core.h>
  29 #include <linux/mmc/card.h>
  30 #include <linux/blkdev.h>
  31
  32 #include <asm/setup.h>
  33 #include <asm/mpspec_def.h>
  34 #include <asm/hw_irq.h>
  35 #include <asm/apic.h>
  36 #include <asm/io_apic.h>
  37 #include <asm/intel-mid.h>
  38 #include <asm/intel_mid_vrtc.h>
  39 #include <asm/io.h>
  40 #include <asm/i8259.h>
  41 #include <asm/intel_scu_ipc.h>
  42 #include <asm/apb_timer.h>
  43 #include <asm/reboot.h>
  44
  45 #define SFI_SIG_OEM0    "OEM0"
  46 #define MAX_IPCDEVS     24
  47 #define MAX_SCU_SPI     24
  48 #define MAX_SCU_I2C     24
  49
  50 static struct platform_device *ipc_devs[MAX_IPCDEVS];
  51 static struct spi_board_info *spi_devs[MAX_SCU_SPI];
  52 static struct i2c_board_info *i2c_devs[MAX_SCU_I2C];
  53 static struct sfi_gpio_table_entry *gpio_table;
  54 static struct sfi_timer_table_entry sfi_mtimer_array[SFI_MTMR_MAX_NUM];
  55 static int ipc_next_dev;
  56 static int spi_next_dev;
  57 static int i2c_next_dev;
  58 static int i2c_bus[MAX_SCU_I2C];
  59 static int gpio_num_entry;
  60 static u32 sfi_mtimer_usage[SFI_MTMR_MAX_NUM];
  61 int sfi_mrtc_num;
  62 int sfi_mtimer_num;
  63
  64 struct sfi_rtc_table_entry sfi_mrtc_array[SFI_MRTC_MAX];
  65 EXPORT_SYMBOL_GPL(sfi_mrtc_array);
  66
  67 struct blocking_notifier_head intel_scu_notifier =
  68                         BLOCKING_NOTIFIER_INIT(intel_scu_notifier);
  69 EXPORT_SYMBOL_GPL(intel_scu_notifier);
  70
  71 #define intel_mid_sfi_get_pdata(dev, priv)      \
  72         ((dev)->get_platform_data ? (dev)->get_platform_data(priv) : NULL)
  73
  74 /* parse all the mtimer info to a static mtimer array */
  75 int __init sfi_parse_mtmr(struct sfi_table_header *table)
  76 {
  77         struct sfi_table_simple *sb;
  78         struct sfi_timer_table_entry *pentry;
  79         struct mpc_intsrc mp_irq;
  80         int totallen;
  81
  82         sb = (struct sfi_table_simple *)table;
  83         if (!sfi_mtimer_num) {
  84                 sfi_mtimer_num = SFI_GET_NUM_ENTRIES(sb,
  85                                         struct sfi_timer_table_entry);
  86                 pentry = (struct sfi_timer_table_entry *) sb->pentry;
  87                 totallen = sfi_mtimer_num * sizeof(*pentry);
  88                 memcpy(sfi_mtimer_array, pentry, totallen);
  89         }
  90
  91         pr_debug("SFI MTIMER info (num = %d):\n", sfi_mtimer_num);
  92         pentry = sfi_mtimer_array;
  93         for (totallen = 0; totallen < sfi_mtimer_num; totallen++, pentry++) {
  94                 pr_debug("timer[%d]: paddr = 0x%08x, freq = %dHz, irq = %d\n",
  95                         totallen, (u32)pentry->phys_addr,
  96                         pentry->freq_hz, pentry->irq);
  97                 mp_irq.type = MP_INTSRC;
  98                 mp_irq.irqtype = mp_INT;
  99                 mp_irq.irqflag = MP_IRQTRIG_EDGE | MP_IRQPOL_ACTIVE_HIGH;
 100                 mp_irq.srcbus = MP_BUS_ISA;
 101                 mp_irq.srcbusirq = pentry->irq; /* IRQ */
 102                 mp_irq.dstapic = MP_APIC_ALL;
 103                 mp_irq.dstirq = pentry->irq;
 104                 mp_save_irq(&mp_irq);
 105                 mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC, NULL);
 106         }
 107
 108         return 0;
 109 }
 110
 111 struct sfi_timer_table_entry *sfi_get_mtmr(int hint)
 112 {
 113         int i;
 114         if (hint < sfi_mtimer_num) {
 115                 if (!sfi_mtimer_usage[hint]) {
 116                         pr_debug("hint taken for timer %d irq %d\n",
 117                                 hint, sfi_mtimer_array[hint].irq);
 118                         sfi_mtimer_usage[hint] = 1;
 119                         return &sfi_mtimer_array[hint];
 120                 }
 121         }
 122         /* take the first timer available */
 123         for (i = 0; i < sfi_mtimer_num;) {
 124                 if (!sfi_mtimer_usage[i]) {
 125                         sfi_mtimer_usage[i] = 1;
 126                         return &sfi_mtimer_array[i];
 127                 }
 128                 i++;
 129         }
 130         return NULL;
 131 }
 132
 133 void sfi_free_mtmr(struct sfi_timer_table_entry *mtmr)
 134 {
 135         int i;
 136         for (i = 0; i < sfi_mtimer_num;) {
 137                 if (mtmr->irq == sfi_mtimer_array[i].irq) {
 138                         sfi_mtimer_usage[i] = 0;
 139                         return;
 140                 }
 141                 i++;
 142         }
 143 }
 144
 145 /* parse all the mrtc info to a global mrtc array */
 146 int __init sfi_parse_mrtc(struct sfi_table_header *table)
 147 {
 148         struct sfi_table_simple *sb;
 149         struct sfi_rtc_table_entry *pentry;
 150         struct mpc_intsrc mp_irq;
 151
 152         int totallen;
 153
 154         sb = (struct sfi_table_simple *)table;
 155         if (!sfi_mrtc_num) {
 156                 sfi_mrtc_num = SFI_GET_NUM_ENTRIES(sb,
 157                                                 struct sfi_rtc_table_entry);
 158                 pentry = (struct sfi_rtc_table_entry *)sb->pentry;
 159                 totallen = sfi_mrtc_num * sizeof(*pentry);
 160                 memcpy(sfi_mrtc_array, pentry, totallen);
 161         }
 162
 163         pr_debug("SFI RTC info (num = %d):\n", sfi_mrtc_num);
 164         pentry = sfi_mrtc_array;
 165         for (totallen = 0; totallen < sfi_mrtc_num; totallen++, pentry++) {
 166                 pr_debug("RTC[%d]: paddr = 0x%08x, irq = %d\n",
 167                         totallen, (u32)pentry->phys_addr, pentry->irq);
 168                 mp_irq.type = MP_INTSRC;
 169                 mp_irq.irqtype = mp_INT;
 170                 mp_irq.irqflag = MP_IRQTRIG_LEVEL | MP_IRQPOL_ACTIVE_LOW;
 171                 mp_irq.srcbus = MP_BUS_ISA;
 172                 mp_irq.srcbusirq = pentry->irq; /* IRQ */
 173                 mp_irq.dstapic = MP_APIC_ALL;
 174                 mp_irq.dstirq = pentry->irq;
 175                 mp_save_irq(&mp_irq);
 176                 mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC, NULL);
 177         }
 178         return 0;
 179 }
 180
 181
 182 /*
 183  * Parsing GPIO table first, since the DEVS table will need this table
 184  * to map the pin name to the actual pin.
 185  */
 186 static int __init sfi_parse_gpio(struct sfi_table_header *table)
 187 {
 188         struct sfi_table_simple *sb;
 189         struct sfi_gpio_table_entry *pentry;
 190         int num, i;
 191
 192         if (gpio_table)
 193                 return 0;
 194         sb = (struct sfi_table_simple *)table;
 195         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_gpio_table_entry);
 196         pentry = (struct sfi_gpio_table_entry *)sb->pentry;
 197
 198         gpio_table = kmemdup(pentry, num * sizeof(*pentry), GFP_KERNEL);
 199         if (!gpio_table)
 200                 return -1;
 201         gpio_num_entry = num;
 202
 203         pr_debug("GPIO pin info:\n");
 204         for (i = 0; i < num; i++, pentry++)
 205                 pr_debug("info[%2d]: controller = %16.16s, pin_name = %16.16s,"
 206                 " pin = %d\n", i,
 207                         pentry->controller_name,
 208                         pentry->pin_name,
 209                         pentry->pin_no);
 210         return 0;
 211 }
 212
 213 int get_gpio_by_name(const char *name)
 214 {
 215         struct sfi_gpio_table_entry *pentry = gpio_table;
 216         int i;
 217
 218         if (!pentry)
 219                 return -1;
 220         for (i = 0; i < gpio_num_entry; i++, pentry++) {
 221                 if (!strncmp(name, pentry->pin_name, SFI_NAME_LEN))
 222                         return pentry->pin_no;
 223         }
 224         return -EINVAL;
 225 }
 226
 227 static void __init intel_scu_ipc_device_register(struct platform_device *pdev)
 228 {
 229         if (ipc_next_dev == MAX_IPCDEVS)
 230                 pr_err("too many SCU IPC devices");
 231         else
 232                 ipc_devs[ipc_next_dev++] = pdev;
 233 }
 234
 235 static void __init intel_scu_spi_device_register(struct spi_board_info *sdev)
 236 {
 237         struct spi_board_info *new_dev;
 238
 239         if (spi_next_dev == MAX_SCU_SPI) {
 240                 pr_err("too many SCU SPI devices");
 241                 return;
 242         }
 243
 244         new_dev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 245         if (!new_dev) {
 246                 pr_err("failed to alloc mem for delayed spi dev %s\n",
 247                         sdev->modalias);
 248                 return;
 249         }
 250         *new_dev = *sdev;
 251
 252         spi_devs[spi_next_dev++] = new_dev;
 253 }
 254
 255 static void __init intel_scu_i2c_device_register(int bus,
 256                                                 struct i2c_board_info *idev)
 257 {
 258         struct i2c_board_info *new_dev;
 259
 260         if (i2c_next_dev == MAX_SCU_I2C) {
 261                 pr_err("too many SCU I2C devices");
 262                 return;
 263         }
 264
 265         new_dev = kzalloc(sizeof(*idev), GFP_KERNEL);
 266         if (!new_dev) {
 267                 pr_err("failed to alloc mem for delayed i2c dev %s\n",
 268                         idev->type);
 269                 return;
 270         }
 271         *new_dev = *idev;
 272
 273         i2c_bus[i2c_next_dev] = bus;
 274         i2c_devs[i2c_next_dev++] = new_dev;
 275 }
 276
 277 /* Called by IPC driver */
 278 void intel_scu_devices_create(void)
 279 {
 280         int i;
 281
 282         for (i = 0; i < ipc_next_dev; i++)
 283                 platform_device_add(ipc_devs[i]);
 284
 285         for (i = 0; i < spi_next_dev; i++)
 286                 spi_register_board_info(spi_devs[i], 1);
 287
 288         for (i = 0; i < i2c_next_dev; i++) {
 289                 struct i2c_adapter *adapter;
 290                 struct i2c_client *client;
 291
 292                 adapter = i2c_get_adapter(i2c_bus[i]);
 293                 if (adapter) {
 294                         client = i2c_new_device(adapter, i2c_devs[i]);
 295                         if (!client)
 296                                 pr_err("can't create i2c device %s\n",
 297                                         i2c_devs[i]->type);
 298                 } else
 299                         i2c_register_board_info(i2c_bus[i], i2c_devs[i], 1);
 300         }
 301         intel_scu_notifier_post(SCU_AVAILABLE, NULL);
 302 }
 303 EXPORT_SYMBOL_GPL(intel_scu_devices_create);
 304
 305 /* Called by IPC driver */
 306 void intel_scu_devices_destroy(void)
 307 {
 308         int i;
 309
 310         intel_scu_notifier_post(SCU_DOWN, NULL);
 311
 312         for (i = 0; i < ipc_next_dev; i++)
 313                 platform_device_del(ipc_devs[i]);
 314 }
 315 EXPORT_SYMBOL_GPL(intel_scu_devices_destroy);
 316
 317 static void __init install_irq_resource(struct platform_device *pdev, int irq)
 318 {
 319         /* Single threaded */
 320         static struct resource res __initdata = {
 321                 .name = "IRQ",
 322                 .flags = IORESOURCE_IRQ,
 323         };
 324         res.start = irq;
 325         platform_device_add_resources(pdev, &res, 1);
 326 }
 327
 328 static void __init sfi_handle_ipc_dev(struct sfi_device_table_entry *pentry,
 329                                         struct devs_id *dev)
 330 {
 331         struct platform_device *pdev;
 332         void *pdata = NULL;
 333
 334         pr_debug("IPC bus, name = %16.16s, irq = 0x%2x\n",
 335                 pentry->name, pentry->irq);
 336
 337         /*
 338          * We need to call platform init of IPC devices to fill misc_pdata
 339          * structure. It will be used in msic_init for initialization.
 340          */
 341         pdata = intel_mid_sfi_get_pdata(dev, pentry);
 342         if (IS_ERR(pdata))
 343                 return;
 344
 345         /*
 346          * On Medfield the platform device creation is handled by the MSIC
 347          * MFD driver so we don't need to do it here.
 348          */
 349         if (dev->msic && intel_mid_has_msic())
 350                 return;
 351
 352         pdev = platform_device_alloc(pentry->name, 0);
 353         if (pdev == NULL) {
 354                 pr_err("out of memory for SFI platform device '%s'.\n",
 355                         pentry->name);
 356                 return;
 357         }
 358         install_irq_resource(pdev, pentry->irq);
 359
 360         pdev->dev.platform_data = pdata;
 361         if (dev->delay)
 362                 intel_scu_ipc_device_register(pdev);
 363         else
 364                 platform_device_add(pdev);
 365 }
 366
 367 static void __init sfi_handle_spi_dev(struct sfi_device_table_entry *pentry,
 368                                         struct devs_id *dev)
 369 {
 370         struct spi_board_info spi_info;
 371         void *pdata = NULL;
 372
 373         memset(&spi_info, 0, sizeof(spi_info));
 374         strncpy(spi_info.modalias, pentry->name, SFI_NAME_LEN);
 375         spi_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
 376         spi_info.bus_num = pentry->host_num;
 377         spi_info.chip_select = pentry->addr;
 378         spi_info.max_speed_hz = pentry->max_freq;
 379         pr_debug("SPI bus=%d, name=%16.16s, irq=0x%2x, max_freq=%d, cs=%d\n",
 380                 spi_info.bus_num,
 381                 spi_info.modalias,
 382                 spi_info.irq,
 383                 spi_info.max_speed_hz,
 384                 spi_info.chip_select);
 385
 386         pdata = intel_mid_sfi_get_pdata(dev, &spi_info);
 387         if (IS_ERR(pdata))
 388                 return;
 389
 390         spi_info.platform_data = pdata;
 391         if (dev->delay)
 392                 intel_scu_spi_device_register(&spi_info);
 393         else
 394                 spi_register_board_info(&spi_info, 1);
 395 }
 396
 397 static void __init sfi_handle_i2c_dev(struct sfi_device_table_entry *pentry,
 398                                         struct devs_id *dev)
 399 {
 400         struct i2c_board_info i2c_info;
 401         void *pdata = NULL;
 402
 403         memset(&i2c_info, 0, sizeof(i2c_info));
 404         strncpy(i2c_info.type, pentry->name, SFI_NAME_LEN);
 405         i2c_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
 406         i2c_info.addr = pentry->addr;
 407         pr_debug("I2C bus = %d, name = %16.16s, irq = 0x%2x, addr = 0x%x\n",
 408                 pentry->host_num,
 409                 i2c_info.type,
 410                 i2c_info.irq,
 411                 i2c_info.addr);
 412         pdata = intel_mid_sfi_get_pdata(dev, &i2c_info);
 413         i2c_info.platform_data = pdata;
 414         if (IS_ERR(pdata))
 415                 return;
 416
 417         if (dev->delay)
 418                 intel_scu_i2c_device_register(pentry->host_num, &i2c_info);
 419         else
 420                 i2c_register_board_info(pentry->host_num, &i2c_info, 1);
 421 }
 422
 423 static void __init sfi_handle_sd_dev(struct sfi_device_table_entry *pentry,
 424                                         struct devs_id *dev)
 425 {
 426         struct mid_sd_board_info sd_info;
 427         void *pdata;
 428
 429         memset(&sd_info, 0, sizeof(sd_info));
 430         strncpy(sd_info.name, pentry->name, SFI_NAME_LEN);
 431         sd_info.bus_num = pentry->host_num;
 432         sd_info.max_clk = pentry->max_freq;
 433         sd_info.addr = pentry->addr;
 434         pr_debug("SD bus = %d, name = %16.16s, max_clk = %d, addr = 0x%x\n",
 435                  sd_info.bus_num,
 436                  sd_info.name,
 437                  sd_info.max_clk,
 438                  sd_info.addr);
 439         pdata = intel_mid_sfi_get_pdata(dev, &sd_info);
 440         if (IS_ERR(pdata))
 441                 return;
 442
 443         /* Nothing we can do with this for now */
 444         sd_info.platform_data = pdata;
 445
 446         pr_debug("Successfully registered %16.16s", sd_info.name);
 447 }
 448
 449 extern struct devs_id *const __x86_intel_mid_dev_start[],
 450                       *const __x86_intel_mid_dev_end[];
 451
 452 static struct devs_id __init *get_device_id(u8 type, char *name)
 453 {
 454         struct devs_id *const *dev_table;
 455
 456         for (dev_table = __x86_intel_mid_dev_start;
 457                         dev_table < __x86_intel_mid_dev_end; dev_table++) {
 458                 struct devs_id *dev = *dev_table;
 459                 if (dev->type == type &&
 460                         !strncmp(dev->name, name, SFI_NAME_LEN)) {
 461                         return dev;
 462                 }
 463         }
 464
 465         return NULL;
 466 }
 467
 468 static int __init sfi_parse_devs(struct sfi_table_header *table)
 469 {
 470         struct sfi_table_simple *sb;
 471         struct sfi_device_table_entry *pentry;
 472         struct devs_id *dev = NULL;
 473         int num, i, ret;
 474         int polarity;
 475         struct irq_alloc_info info;
 476
 477         sb = (struct sfi_table_simple *)table;
 478         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_device_table_entry);
 479         pentry = (struct sfi_device_table_entry *)sb->pentry;
 480
 481         for (i = 0; i < num; i++, pentry++) {
 482                 int irq = pentry->irq;
 483
 484                 if (irq != (u8)0xff) { /* native RTE case */
 485                         /* these SPI2 devices are not exposed to system as PCI
 486                          * devices, but they have separate RTE entry in IOAPIC
 487                          * so we have to enable them one by one here
 488                          */
 489                         if (intel_mid_identify_cpu() ==
 490                                         INTEL_MID_CPU_CHIP_TANGIER) {
 491                                 if (!strncmp(pentry->name, "r69001-ts-i2c", 13))
 492                                         /* active low */
 493                                         polarity = 1;
 494                                 else if (!strncmp(pentry->name,
 495                                                 "synaptics_3202", 14))
 496                                         /* active low */
 497                                         polarity = 1;
 498                                 else if (irq == 41)
 499                                         /* fast_int_1 */
 500                                         polarity = 1;
 501                                 else
 502                                         /* active high */
 503                                         polarity = 0;
 504                         } else {
 505                                 /* PNW and CLV go with active low */
 506                                 polarity = 1;
 507                         }
 508
 509                         ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 1, polarity);
 510                         ret = mp_map_gsi_to_irq(irq, IOAPIC_MAP_ALLOC, &info);
 511                         WARN_ON(ret < 0);
 512                 }
 513
 514                 dev = get_device_id(pentry->type, pentry->name);
 515
 516                 if (!dev)
 517                         continue;
 518
 519                 switch (pentry->type) {
 520                 case SFI_DEV_TYPE_IPC:
 521                         sfi_handle_ipc_dev(pentry, dev);
 522                         break;
 523                 case SFI_DEV_TYPE_SPI:
 524                         sfi_handle_spi_dev(pentry, dev);
 525                         break;
 526                 case SFI_DEV_TYPE_I2C:
 527                         sfi_handle_i2c_dev(pentry, dev);
 528                         break;
 529                 case SFI_DEV_TYPE_SD:
 530                         sfi_handle_sd_dev(pentry, dev);
 531                         break;
 532                 case SFI_DEV_TYPE_UART:
 533                 case SFI_DEV_TYPE_HSI:
 534                 default:
 535                         break;
 536                 }
 537         }
 538         return 0;
 539 }
 540
 541 static int __init intel_mid_platform_init(void)
 542 {
 543         sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, sfi_parse_gpio);
 544         sfi_table_parse(SFI_SIG_DEVS, NULL, NULL, sfi_parse_devs);
 545         return 0;
 546 }
 547 arch_initcall(intel_mid_platform_init);