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

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  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 -EINVAL;
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         *new_dev = *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         *new_dev = *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         if (IS_ERR(pdata))
341                 return;
342 
343         pdev = platform_device_alloc(pentry->name, 0);
344         if (pdev == NULL) {
345                 pr_err("out of memory for SFI platform device '%s'.\n",
346                         pentry->name);
347                 return;
348         }
349         install_irq_resource(pdev, pentry->irq);
350 
351         pdev->dev.platform_data = pdata;
352         platform_device_add(pdev);
353 }
354 
355 static void __init sfi_handle_spi_dev(struct sfi_device_table_entry *pentry,
356                                         struct devs_id *dev)
357 {
358         struct spi_board_info spi_info;
359         void *pdata = NULL;
360 
361         memset(&spi_info, 0, sizeof(spi_info));
362         strncpy(spi_info.modalias, pentry->name, SFI_NAME_LEN);
363         spi_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
364         spi_info.bus_num = pentry->host_num;
365         spi_info.chip_select = pentry->addr;
366         spi_info.max_speed_hz = pentry->max_freq;
367         pr_debug("SPI bus=%d, name=%16.16s, irq=0x%2x, max_freq=%d, cs=%d\n",
368                 spi_info.bus_num,
369                 spi_info.modalias,
370                 spi_info.irq,
371                 spi_info.max_speed_hz,
372                 spi_info.chip_select);
373 
374         pdata = intel_mid_sfi_get_pdata(dev, &spi_info);
375         if (IS_ERR(pdata))
376                 return;
377 
378         spi_info.platform_data = pdata;
379         if (dev->delay)
380                 intel_scu_spi_device_register(&spi_info);
381         else
382                 spi_register_board_info(&spi_info, 1);
383 }
384 
385 static void __init sfi_handle_i2c_dev(struct sfi_device_table_entry *pentry,
386                                         struct devs_id *dev)
387 {
388         struct i2c_board_info i2c_info;
389         void *pdata = NULL;
390 
391         memset(&i2c_info, 0, sizeof(i2c_info));
392         strncpy(i2c_info.type, pentry->name, SFI_NAME_LEN);
393         i2c_info.irq = ((pentry->irq == (u8)0xff) ? 0 : pentry->irq);
394         i2c_info.addr = pentry->addr;
395         pr_debug("I2C bus = %d, name = %16.16s, irq = 0x%2x, addr = 0x%x\n",
396                 pentry->host_num,
397                 i2c_info.type,
398                 i2c_info.irq,
399                 i2c_info.addr);
400         pdata = intel_mid_sfi_get_pdata(dev, &i2c_info);
401         i2c_info.platform_data = pdata;
402         if (IS_ERR(pdata))
403                 return;
404 
405         if (dev->delay)
406                 intel_scu_i2c_device_register(pentry->host_num, &i2c_info);
407         else
408                 i2c_register_board_info(pentry->host_num, &i2c_info, 1);
409 }
410 
411 extern struct devs_id *const __x86_intel_mid_dev_start[],
412                       *const __x86_intel_mid_dev_end[];
413 
414 static struct devs_id __init *get_device_id(u8 type, char *name)
415 {
416         struct devs_id *const *dev_table;
417 
418         for (dev_table = __x86_intel_mid_dev_start;
419                         dev_table < __x86_intel_mid_dev_end; dev_table++) {
420                 struct devs_id *dev = *dev_table;
421                 if (dev->type == type &&
422                         !strncmp(dev->name, name, SFI_NAME_LEN)) {
423                         return dev;
424                 }
425         }
426 
427         return NULL;
428 }
429 
430 static int __init sfi_parse_devs(struct sfi_table_header *table)
431 {
432         struct sfi_table_simple *sb;
433         struct sfi_device_table_entry *pentry;
434         struct devs_id *dev = NULL;
435         int num, i;
436         int ioapic;
437         struct io_apic_irq_attr irq_attr;
438 
439         sb = (struct sfi_table_simple *)table;
440         num = SFI_GET_NUM_ENTRIES(sb, struct sfi_device_table_entry);
441         pentry = (struct sfi_device_table_entry *)sb->pentry;
442 
443         for (i = 0; i < num; i++, pentry++) {
444                 int irq = pentry->irq;
445 
446                 if (irq != (u8)0xff) { /* native RTE case */
447                         /* these SPI2 devices are not exposed to system as PCI
448                          * devices, but they have separate RTE entry in IOAPIC
449                          * so we have to enable them one by one here
450                          */
451                         ioapic = mp_find_ioapic(irq);
452                         if (ioapic >= 0) {
453                                 irq_attr.ioapic = ioapic;
454                                 irq_attr.ioapic_pin = irq;
455                                 irq_attr.trigger = 1;
456                                 if (intel_mid_identify_cpu() ==
457                                                 INTEL_MID_CPU_CHIP_TANGIER) {
458                                         if (!strncmp(pentry->name,
459                                                         "r69001-ts-i2c", 13))
460                                                 /* active low */
461                                                 irq_attr.polarity = 1;
462                                         else if (!strncmp(pentry->name,
463                                                         "synaptics_3202", 14))
464                                                 /* active low */
465                                                 irq_attr.polarity = 1;
466                                         else if (irq == 41)
467                                                 /* fast_int_1 */
468                                                 irq_attr.polarity = 1;
469                                         else
470                                                 /* active high */
471                                                 irq_attr.polarity = 0;
472                                 } else {
473                                         /* PNW and CLV go with active low */
474                                         irq_attr.polarity = 1;
475                                 }
476                                 io_apic_set_pci_routing(NULL, irq, &irq_attr);
477                         }
478                 } else {
479                         irq = 0; /* No irq */
480                 }
481 
482                 dev = get_device_id(pentry->type, pentry->name);
483 
484                 if (!dev)
485                         continue;
486 
487                 if (dev->device_handler) {
488                         dev->device_handler(pentry, dev);
489                 } else {
490                         switch (pentry->type) {
491                         case SFI_DEV_TYPE_IPC:
492                                 sfi_handle_ipc_dev(pentry, dev);
493                                 break;
494                         case SFI_DEV_TYPE_SPI:
495                                 sfi_handle_spi_dev(pentry, dev);
496                                 break;
497                         case SFI_DEV_TYPE_I2C:
498                                 sfi_handle_i2c_dev(pentry, dev);
499                                 break;
500                         case SFI_DEV_TYPE_UART:
501                         case SFI_DEV_TYPE_HSI:
502                         default:
503                                 break;
504                         }
505                 }
506         }
507         return 0;
508 }
509 
510 static int __init intel_mid_platform_init(void)
511 {
512         sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, sfi_parse_gpio);
513         sfi_table_parse(SFI_SIG_DEVS, NULL, NULL, sfi_parse_devs);
514         return 0;
515 }
516 arch_initcall(intel_mid_platform_init);
517 

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