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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-ep93xx/core.c

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  1 /*
  2  * arch/arm/mach-ep93xx/core.c
  3  * Core routines for Cirrus EP93xx chips.
  4  *
  5  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
  6  * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
  7  *
  8  * Thanks go to Michael Burian and Ray Lehtiniemi for their key
  9  * role in the ep93xx linux community.
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or (at
 14  * your option) any later version.
 15  */
 16 
 17 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
 18 
 19 #include <linux/kernel.h>
 20 #include <linux/init.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/dma-mapping.h>
 24 #include <linux/sys_soc.h>
 25 #include <linux/irq.h>
 26 #include <linux/io.h>
 27 #include <linux/gpio.h>
 28 #include <linux/leds.h>
 29 #include <linux/termios.h>
 30 #include <linux/amba/bus.h>
 31 #include <linux/amba/serial.h>
 32 #include <linux/mtd/physmap.h>
 33 #include <linux/i2c.h>
 34 #include <linux/i2c-gpio.h>
 35 #include <linux/spi/spi.h>
 36 #include <linux/export.h>
 37 #include <linux/irqchip/arm-vic.h>
 38 #include <linux/reboot.h>
 39 #include <linux/usb/ohci_pdriver.h>
 40 #include <linux/random.h>
 41 
 42 #include <mach/hardware.h>
 43 #include <linux/platform_data/video-ep93xx.h>
 44 #include <linux/platform_data/keypad-ep93xx.h>
 45 #include <linux/platform_data/spi-ep93xx.h>
 46 #include <mach/gpio-ep93xx.h>
 47 
 48 #include <asm/mach/arch.h>
 49 #include <asm/mach/map.h>
 50 
 51 #include "soc.h"
 52 
 53 /*************************************************************************
 54  * Static I/O mappings that are needed for all EP93xx platforms
 55  *************************************************************************/
 56 static struct map_desc ep93xx_io_desc[] __initdata = {
 57         {
 58                 .virtual        = EP93XX_AHB_VIRT_BASE,
 59                 .pfn            = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
 60                 .length         = EP93XX_AHB_SIZE,
 61                 .type           = MT_DEVICE,
 62         }, {
 63                 .virtual        = EP93XX_APB_VIRT_BASE,
 64                 .pfn            = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
 65                 .length         = EP93XX_APB_SIZE,
 66                 .type           = MT_DEVICE,
 67         },
 68 };
 69 
 70 void __init ep93xx_map_io(void)
 71 {
 72         iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
 73 }
 74 
 75 /*************************************************************************
 76  * EP93xx IRQ handling
 77  *************************************************************************/
 78 void __init ep93xx_init_irq(void)
 79 {
 80         vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
 81         vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);
 82 }
 83 
 84 
 85 /*************************************************************************
 86  * EP93xx System Controller Software Locked register handling
 87  *************************************************************************/
 88 
 89 /*
 90  * syscon_swlock prevents anything else from writing to the syscon
 91  * block while a software locked register is being written.
 92  */
 93 static DEFINE_SPINLOCK(syscon_swlock);
 94 
 95 void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg)
 96 {
 97         unsigned long flags;
 98 
 99         spin_lock_irqsave(&syscon_swlock, flags);
100 
101         __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
102         __raw_writel(val, reg);
103 
104         spin_unlock_irqrestore(&syscon_swlock, flags);
105 }
106 
107 void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
108 {
109         unsigned long flags;
110         unsigned int val;
111 
112         spin_lock_irqsave(&syscon_swlock, flags);
113 
114         val = __raw_readl(EP93XX_SYSCON_DEVCFG);
115         val &= ~clear_bits;
116         val |= set_bits;
117         __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
118         __raw_writel(val, EP93XX_SYSCON_DEVCFG);
119 
120         spin_unlock_irqrestore(&syscon_swlock, flags);
121 }
122 
123 /**
124  * ep93xx_chip_revision() - returns the EP93xx chip revision
125  *
126  * See <mach/platform.h> for more information.
127  */
128 unsigned int ep93xx_chip_revision(void)
129 {
130         unsigned int v;
131 
132         v = __raw_readl(EP93XX_SYSCON_SYSCFG);
133         v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
134         v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
135         return v;
136 }
137 EXPORT_SYMBOL_GPL(ep93xx_chip_revision);
138 
139 /*************************************************************************
140  * EP93xx GPIO
141  *************************************************************************/
142 static struct resource ep93xx_gpio_resource[] = {
143         DEFINE_RES_MEM(EP93XX_GPIO_PHYS_BASE, 0xcc),
144 };
145 
146 static struct platform_device ep93xx_gpio_device = {
147         .name           = "gpio-ep93xx",
148         .id             = -1,
149         .num_resources  = ARRAY_SIZE(ep93xx_gpio_resource),
150         .resource       = ep93xx_gpio_resource,
151 };
152 
153 /*************************************************************************
154  * EP93xx peripheral handling
155  *************************************************************************/
156 #define EP93XX_UART_MCR_OFFSET          (0x0100)
157 
158 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
159                                   void __iomem *base, unsigned int mctrl)
160 {
161         unsigned int mcr;
162 
163         mcr = 0;
164         if (mctrl & TIOCM_RTS)
165                 mcr |= 2;
166         if (mctrl & TIOCM_DTR)
167                 mcr |= 1;
168 
169         __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
170 }
171 
172 static struct amba_pl010_data ep93xx_uart_data = {
173         .set_mctrl      = ep93xx_uart_set_mctrl,
174 };
175 
176 static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
177         { IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
178 
179 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
180         { IRQ_EP93XX_UART2 }, NULL);
181 
182 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
183         { IRQ_EP93XX_UART3 }, &ep93xx_uart_data);
184 
185 static struct resource ep93xx_rtc_resource[] = {
186         DEFINE_RES_MEM(EP93XX_RTC_PHYS_BASE, 0x10c),
187 };
188 
189 static struct platform_device ep93xx_rtc_device = {
190         .name           = "ep93xx-rtc",
191         .id             = -1,
192         .num_resources  = ARRAY_SIZE(ep93xx_rtc_resource),
193         .resource       = ep93xx_rtc_resource,
194 };
195 
196 /*************************************************************************
197  * EP93xx OHCI USB Host
198  *************************************************************************/
199 
200 static struct clk *ep93xx_ohci_host_clock;
201 
202 static int ep93xx_ohci_power_on(struct platform_device *pdev)
203 {
204         if (!ep93xx_ohci_host_clock) {
205                 ep93xx_ohci_host_clock = devm_clk_get(&pdev->dev, NULL);
206                 if (IS_ERR(ep93xx_ohci_host_clock))
207                         return PTR_ERR(ep93xx_ohci_host_clock);
208         }
209 
210         return clk_enable(ep93xx_ohci_host_clock);
211 }
212 
213 static void ep93xx_ohci_power_off(struct platform_device *pdev)
214 {
215         clk_disable(ep93xx_ohci_host_clock);
216 }
217 
218 static struct usb_ohci_pdata ep93xx_ohci_pdata = {
219         .power_on       = ep93xx_ohci_power_on,
220         .power_off      = ep93xx_ohci_power_off,
221         .power_suspend  = ep93xx_ohci_power_off,
222 };
223 
224 static struct resource ep93xx_ohci_resources[] = {
225         DEFINE_RES_MEM(EP93XX_USB_PHYS_BASE, 0x1000),
226         DEFINE_RES_IRQ(IRQ_EP93XX_USB),
227 };
228 
229 static u64 ep93xx_ohci_dma_mask = DMA_BIT_MASK(32);
230 
231 static struct platform_device ep93xx_ohci_device = {
232         .name           = "ohci-platform",
233         .id             = -1,
234         .num_resources  = ARRAY_SIZE(ep93xx_ohci_resources),
235         .resource       = ep93xx_ohci_resources,
236         .dev            = {
237                 .dma_mask               = &ep93xx_ohci_dma_mask,
238                 .coherent_dma_mask      = DMA_BIT_MASK(32),
239                 .platform_data          = &ep93xx_ohci_pdata,
240         },
241 };
242 
243 /*************************************************************************
244  * EP93xx physmap'ed flash
245  *************************************************************************/
246 static struct physmap_flash_data ep93xx_flash_data;
247 
248 static struct resource ep93xx_flash_resource = {
249         .flags          = IORESOURCE_MEM,
250 };
251 
252 static struct platform_device ep93xx_flash = {
253         .name           = "physmap-flash",
254         .id             = 0,
255         .dev            = {
256                 .platform_data  = &ep93xx_flash_data,
257         },
258         .num_resources  = 1,
259         .resource       = &ep93xx_flash_resource,
260 };
261 
262 /**
263  * ep93xx_register_flash() - Register the external flash device.
264  * @width:      bank width in octets
265  * @start:      resource start address
266  * @size:       resource size
267  */
268 void __init ep93xx_register_flash(unsigned int width,
269                                   resource_size_t start, resource_size_t size)
270 {
271         ep93xx_flash_data.width         = width;
272 
273         ep93xx_flash_resource.start     = start;
274         ep93xx_flash_resource.end       = start + size - 1;
275 
276         platform_device_register(&ep93xx_flash);
277 }
278 
279 
280 /*************************************************************************
281  * EP93xx ethernet peripheral handling
282  *************************************************************************/
283 static struct ep93xx_eth_data ep93xx_eth_data;
284 
285 static struct resource ep93xx_eth_resource[] = {
286         DEFINE_RES_MEM(EP93XX_ETHERNET_PHYS_BASE, 0x10000),
287         DEFINE_RES_IRQ(IRQ_EP93XX_ETHERNET),
288 };
289 
290 static u64 ep93xx_eth_dma_mask = DMA_BIT_MASK(32);
291 
292 static struct platform_device ep93xx_eth_device = {
293         .name           = "ep93xx-eth",
294         .id             = -1,
295         .dev            = {
296                 .platform_data          = &ep93xx_eth_data,
297                 .coherent_dma_mask      = DMA_BIT_MASK(32),
298                 .dma_mask               = &ep93xx_eth_dma_mask,
299         },
300         .num_resources  = ARRAY_SIZE(ep93xx_eth_resource),
301         .resource       = ep93xx_eth_resource,
302 };
303 
304 /**
305  * ep93xx_register_eth - Register the built-in ethernet platform device.
306  * @data:       platform specific ethernet configuration (__initdata)
307  * @copy_addr:  flag indicating that the MAC address should be copied
308  *              from the IndAd registers (as programmed by the bootloader)
309  */
310 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
311 {
312         if (copy_addr)
313                 memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);
314 
315         ep93xx_eth_data = *data;
316         platform_device_register(&ep93xx_eth_device);
317 }
318 
319 
320 /*************************************************************************
321  * EP93xx i2c peripheral handling
322  *************************************************************************/
323 static struct i2c_gpio_platform_data ep93xx_i2c_data;
324 
325 static struct platform_device ep93xx_i2c_device = {
326         .name           = "i2c-gpio",
327         .id             = 0,
328         .dev            = {
329                 .platform_data  = &ep93xx_i2c_data,
330         },
331 };
332 
333 /**
334  * ep93xx_register_i2c - Register the i2c platform device.
335  * @data:       platform specific i2c-gpio configuration (__initdata)
336  * @devices:    platform specific i2c bus device information (__initdata)
337  * @num:        the number of devices on the i2c bus
338  */
339 void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
340                                 struct i2c_board_info *devices, int num)
341 {
342         /*
343          * Set the EEPROM interface pin drive type control.
344          * Defines the driver type for the EECLK and EEDAT pins as either
345          * open drain, which will require an external pull-up, or a normal
346          * CMOS driver.
347          */
348         if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT)
349                 pr_warning("sda != EEDAT, open drain has no effect\n");
350         if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK)
351                 pr_warning("scl != EECLK, open drain has no effect\n");
352 
353         __raw_writel((data->sda_is_open_drain << 1) |
354                      (data->scl_is_open_drain << 0),
355                      EP93XX_GPIO_EEDRIVE);
356 
357         ep93xx_i2c_data = *data;
358         i2c_register_board_info(0, devices, num);
359         platform_device_register(&ep93xx_i2c_device);
360 }
361 
362 /*************************************************************************
363  * EP93xx SPI peripheral handling
364  *************************************************************************/
365 static struct ep93xx_spi_info ep93xx_spi_master_data;
366 
367 static struct resource ep93xx_spi_resources[] = {
368         DEFINE_RES_MEM(EP93XX_SPI_PHYS_BASE, 0x18),
369         DEFINE_RES_IRQ(IRQ_EP93XX_SSP),
370 };
371 
372 static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
373 
374 static struct platform_device ep93xx_spi_device = {
375         .name           = "ep93xx-spi",
376         .id             = 0,
377         .dev            = {
378                 .platform_data          = &ep93xx_spi_master_data,
379                 .coherent_dma_mask      = DMA_BIT_MASK(32),
380                 .dma_mask               = &ep93xx_spi_dma_mask,
381         },
382         .num_resources  = ARRAY_SIZE(ep93xx_spi_resources),
383         .resource       = ep93xx_spi_resources,
384 };
385 
386 /**
387  * ep93xx_register_spi() - registers spi platform device
388  * @info: ep93xx board specific spi master info (__initdata)
389  * @devices: SPI devices to register (__initdata)
390  * @num: number of SPI devices to register
391  *
392  * This function registers platform device for the EP93xx SPI controller and
393  * also makes sure that SPI pins are muxed so that I2S is not using those pins.
394  */
395 void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
396                                 struct spi_board_info *devices, int num)
397 {
398         /*
399          * When SPI is used, we need to make sure that I2S is muxed off from
400          * SPI pins.
401          */
402         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
403 
404         ep93xx_spi_master_data = *info;
405         spi_register_board_info(devices, num);
406         platform_device_register(&ep93xx_spi_device);
407 }
408 
409 /*************************************************************************
410  * EP93xx LEDs
411  *************************************************************************/
412 static const struct gpio_led ep93xx_led_pins[] __initconst = {
413         {
414                 .name   = "platform:grled",
415                 .gpio   = EP93XX_GPIO_LINE_GRLED,
416         }, {
417                 .name   = "platform:rdled",
418                 .gpio   = EP93XX_GPIO_LINE_RDLED,
419         },
420 };
421 
422 static const struct gpio_led_platform_data ep93xx_led_data __initconst = {
423         .num_leds       = ARRAY_SIZE(ep93xx_led_pins),
424         .leds           = ep93xx_led_pins,
425 };
426 
427 /*************************************************************************
428  * EP93xx pwm peripheral handling
429  *************************************************************************/
430 static struct resource ep93xx_pwm0_resource[] = {
431         DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE, 0x10),
432 };
433 
434 static struct platform_device ep93xx_pwm0_device = {
435         .name           = "ep93xx-pwm",
436         .id             = 0,
437         .num_resources  = ARRAY_SIZE(ep93xx_pwm0_resource),
438         .resource       = ep93xx_pwm0_resource,
439 };
440 
441 static struct resource ep93xx_pwm1_resource[] = {
442         DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE + 0x20, 0x10),
443 };
444 
445 static struct platform_device ep93xx_pwm1_device = {
446         .name           = "ep93xx-pwm",
447         .id             = 1,
448         .num_resources  = ARRAY_SIZE(ep93xx_pwm1_resource),
449         .resource       = ep93xx_pwm1_resource,
450 };
451 
452 void __init ep93xx_register_pwm(int pwm0, int pwm1)
453 {
454         if (pwm0)
455                 platform_device_register(&ep93xx_pwm0_device);
456 
457         /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
458         if (pwm1)
459                 platform_device_register(&ep93xx_pwm1_device);
460 }
461 
462 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
463 {
464         int err;
465 
466         if (pdev->id == 0) {
467                 err = 0;
468         } else if (pdev->id == 1) {
469                 err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
470                                    dev_name(&pdev->dev));
471                 if (err)
472                         return err;
473                 err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
474                 if (err)
475                         goto fail;
476 
477                 /* PWM 1 output on EGPIO[14] */
478                 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
479         } else {
480                 err = -ENODEV;
481         }
482 
483         return err;
484 
485 fail:
486         gpio_free(EP93XX_GPIO_LINE_EGPIO14);
487         return err;
488 }
489 EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
490 
491 void ep93xx_pwm_release_gpio(struct platform_device *pdev)
492 {
493         if (pdev->id == 1) {
494                 gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
495                 gpio_free(EP93XX_GPIO_LINE_EGPIO14);
496 
497                 /* EGPIO[14] used for GPIO */
498                 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
499         }
500 }
501 EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
502 
503 
504 /*************************************************************************
505  * EP93xx video peripheral handling
506  *************************************************************************/
507 static struct ep93xxfb_mach_info ep93xxfb_data;
508 
509 static struct resource ep93xx_fb_resource[] = {
510         DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE, 0x800),
511 };
512 
513 static struct platform_device ep93xx_fb_device = {
514         .name                   = "ep93xx-fb",
515         .id                     = -1,
516         .dev                    = {
517                 .platform_data          = &ep93xxfb_data,
518                 .coherent_dma_mask      = DMA_BIT_MASK(32),
519                 .dma_mask               = &ep93xx_fb_device.dev.coherent_dma_mask,
520         },
521         .num_resources          = ARRAY_SIZE(ep93xx_fb_resource),
522         .resource               = ep93xx_fb_resource,
523 };
524 
525 /* The backlight use a single register in the framebuffer's register space */
526 #define EP93XX_RASTER_REG_BRIGHTNESS 0x20
527 
528 static struct resource ep93xx_bl_resources[] = {
529         DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE +
530                        EP93XX_RASTER_REG_BRIGHTNESS, 0x04),
531 };
532 
533 static struct platform_device ep93xx_bl_device = {
534         .name           = "ep93xx-bl",
535         .id             = -1,
536         .num_resources  = ARRAY_SIZE(ep93xx_bl_resources),
537         .resource       = ep93xx_bl_resources,
538 };
539 
540 /**
541  * ep93xx_register_fb - Register the framebuffer platform device.
542  * @data:       platform specific framebuffer configuration (__initdata)
543  */
544 void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
545 {
546         ep93xxfb_data = *data;
547         platform_device_register(&ep93xx_fb_device);
548         platform_device_register(&ep93xx_bl_device);
549 }
550 
551 
552 /*************************************************************************
553  * EP93xx matrix keypad peripheral handling
554  *************************************************************************/
555 static struct ep93xx_keypad_platform_data ep93xx_keypad_data;
556 
557 static struct resource ep93xx_keypad_resource[] = {
558         DEFINE_RES_MEM(EP93XX_KEY_MATRIX_PHYS_BASE, 0x0c),
559         DEFINE_RES_IRQ(IRQ_EP93XX_KEY),
560 };
561 
562 static struct platform_device ep93xx_keypad_device = {
563         .name           = "ep93xx-keypad",
564         .id             = -1,
565         .dev            = {
566                 .platform_data  = &ep93xx_keypad_data,
567         },
568         .num_resources  = ARRAY_SIZE(ep93xx_keypad_resource),
569         .resource       = ep93xx_keypad_resource,
570 };
571 
572 /**
573  * ep93xx_register_keypad - Register the keypad platform device.
574  * @data:       platform specific keypad configuration (__initdata)
575  */
576 void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
577 {
578         ep93xx_keypad_data = *data;
579         platform_device_register(&ep93xx_keypad_device);
580 }
581 
582 int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
583 {
584         int err;
585         int i;
586 
587         for (i = 0; i < 8; i++) {
588                 err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
589                 if (err)
590                         goto fail_gpio_c;
591                 err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
592                 if (err)
593                         goto fail_gpio_d;
594         }
595 
596         /* Enable the keypad controller; GPIO ports C and D used for keypad */
597         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
598                                  EP93XX_SYSCON_DEVCFG_GONK);
599 
600         return 0;
601 
602 fail_gpio_d:
603         gpio_free(EP93XX_GPIO_LINE_C(i));
604 fail_gpio_c:
605         for (--i; i >= 0; --i) {
606                 gpio_free(EP93XX_GPIO_LINE_C(i));
607                 gpio_free(EP93XX_GPIO_LINE_D(i));
608         }
609         return err;
610 }
611 EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
612 
613 void ep93xx_keypad_release_gpio(struct platform_device *pdev)
614 {
615         int i;
616 
617         for (i = 0; i < 8; i++) {
618                 gpio_free(EP93XX_GPIO_LINE_C(i));
619                 gpio_free(EP93XX_GPIO_LINE_D(i));
620         }
621 
622         /* Disable the keypad controller; GPIO ports C and D used for GPIO */
623         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
624                                EP93XX_SYSCON_DEVCFG_GONK);
625 }
626 EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
627 
628 /*************************************************************************
629  * EP93xx I2S audio peripheral handling
630  *************************************************************************/
631 static struct resource ep93xx_i2s_resource[] = {
632         DEFINE_RES_MEM(EP93XX_I2S_PHYS_BASE, 0x100),
633 };
634 
635 static struct platform_device ep93xx_i2s_device = {
636         .name           = "ep93xx-i2s",
637         .id             = -1,
638         .num_resources  = ARRAY_SIZE(ep93xx_i2s_resource),
639         .resource       = ep93xx_i2s_resource,
640 };
641 
642 static struct platform_device ep93xx_pcm_device = {
643         .name           = "ep93xx-pcm-audio",
644         .id             = -1,
645 };
646 
647 void __init ep93xx_register_i2s(void)
648 {
649         platform_device_register(&ep93xx_i2s_device);
650         platform_device_register(&ep93xx_pcm_device);
651 }
652 
653 #define EP93XX_SYSCON_DEVCFG_I2S_MASK   (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
654                                          EP93XX_SYSCON_DEVCFG_I2SONAC97)
655 
656 #define EP93XX_I2SCLKDIV_MASK           (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
657                                          EP93XX_SYSCON_I2SCLKDIV_SPOL)
658 
659 int ep93xx_i2s_acquire(void)
660 {
661         unsigned val;
662 
663         ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_I2SONAC97,
664                         EP93XX_SYSCON_DEVCFG_I2S_MASK);
665 
666         /*
667          * This is potentially racy with the clock api for i2s_mclk, sclk and 
668          * lrclk. Since the i2s driver is the only user of those clocks we
669          * rely on it to prevent parallel use of this function and the 
670          * clock api for the i2s clocks.
671          */
672         val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
673         val &= ~EP93XX_I2SCLKDIV_MASK;
674         val |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
675         ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
676 
677         return 0;
678 }
679 EXPORT_SYMBOL(ep93xx_i2s_acquire);
680 
681 void ep93xx_i2s_release(void)
682 {
683         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
684 }
685 EXPORT_SYMBOL(ep93xx_i2s_release);
686 
687 /*************************************************************************
688  * EP93xx AC97 audio peripheral handling
689  *************************************************************************/
690 static struct resource ep93xx_ac97_resources[] = {
691         DEFINE_RES_MEM(EP93XX_AAC_PHYS_BASE, 0xac),
692         DEFINE_RES_IRQ(IRQ_EP93XX_AACINTR),
693 };
694 
695 static struct platform_device ep93xx_ac97_device = {
696         .name           = "ep93xx-ac97",
697         .id             = -1,
698         .num_resources  = ARRAY_SIZE(ep93xx_ac97_resources),
699         .resource       = ep93xx_ac97_resources,
700 };
701 
702 void __init ep93xx_register_ac97(void)
703 {
704         /*
705          * Make sure that the AC97 pins are not used by I2S.
706          */
707         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
708 
709         platform_device_register(&ep93xx_ac97_device);
710         platform_device_register(&ep93xx_pcm_device);
711 }
712 
713 /*************************************************************************
714  * EP93xx Watchdog
715  *************************************************************************/
716 static struct resource ep93xx_wdt_resources[] = {
717         DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
718 };
719 
720 static struct platform_device ep93xx_wdt_device = {
721         .name           = "ep93xx-wdt",
722         .id             = -1,
723         .num_resources  = ARRAY_SIZE(ep93xx_wdt_resources),
724         .resource       = ep93xx_wdt_resources,
725 };
726 
727 /*************************************************************************
728  * EP93xx IDE
729  *************************************************************************/
730 static struct resource ep93xx_ide_resources[] = {
731         DEFINE_RES_MEM(EP93XX_IDE_PHYS_BASE, 0x38),
732         DEFINE_RES_IRQ(IRQ_EP93XX_EXT3),
733 };
734 
735 static struct platform_device ep93xx_ide_device = {
736         .name           = "ep93xx-ide",
737         .id             = -1,
738         .dev            = {
739                 .dma_mask               = &ep93xx_ide_device.dev.coherent_dma_mask,
740                 .coherent_dma_mask      = DMA_BIT_MASK(32),
741         },
742         .num_resources  = ARRAY_SIZE(ep93xx_ide_resources),
743         .resource       = ep93xx_ide_resources,
744 };
745 
746 void __init ep93xx_register_ide(void)
747 {
748         platform_device_register(&ep93xx_ide_device);
749 }
750 
751 int ep93xx_ide_acquire_gpio(struct platform_device *pdev)
752 {
753         int err;
754         int i;
755 
756         err = gpio_request(EP93XX_GPIO_LINE_EGPIO2, dev_name(&pdev->dev));
757         if (err)
758                 return err;
759         err = gpio_request(EP93XX_GPIO_LINE_EGPIO15, dev_name(&pdev->dev));
760         if (err)
761                 goto fail_egpio15;
762         for (i = 2; i < 8; i++) {
763                 err = gpio_request(EP93XX_GPIO_LINE_E(i), dev_name(&pdev->dev));
764                 if (err)
765                         goto fail_gpio_e;
766         }
767         for (i = 4; i < 8; i++) {
768                 err = gpio_request(EP93XX_GPIO_LINE_G(i), dev_name(&pdev->dev));
769                 if (err)
770                         goto fail_gpio_g;
771         }
772         for (i = 0; i < 8; i++) {
773                 err = gpio_request(EP93XX_GPIO_LINE_H(i), dev_name(&pdev->dev));
774                 if (err)
775                         goto fail_gpio_h;
776         }
777 
778         /* GPIO ports E[7:2], G[7:4] and H used by IDE */
779         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
780                                  EP93XX_SYSCON_DEVCFG_GONIDE |
781                                  EP93XX_SYSCON_DEVCFG_HONIDE);
782         return 0;
783 
784 fail_gpio_h:
785         for (--i; i >= 0; --i)
786                 gpio_free(EP93XX_GPIO_LINE_H(i));
787         i = 8;
788 fail_gpio_g:
789         for (--i; i >= 4; --i)
790                 gpio_free(EP93XX_GPIO_LINE_G(i));
791         i = 8;
792 fail_gpio_e:
793         for (--i; i >= 2; --i)
794                 gpio_free(EP93XX_GPIO_LINE_E(i));
795         gpio_free(EP93XX_GPIO_LINE_EGPIO15);
796 fail_egpio15:
797         gpio_free(EP93XX_GPIO_LINE_EGPIO2);
798         return err;
799 }
800 EXPORT_SYMBOL(ep93xx_ide_acquire_gpio);
801 
802 void ep93xx_ide_release_gpio(struct platform_device *pdev)
803 {
804         int i;
805 
806         for (i = 2; i < 8; i++)
807                 gpio_free(EP93XX_GPIO_LINE_E(i));
808         for (i = 4; i < 8; i++)
809                 gpio_free(EP93XX_GPIO_LINE_G(i));
810         for (i = 0; i < 8; i++)
811                 gpio_free(EP93XX_GPIO_LINE_H(i));
812         gpio_free(EP93XX_GPIO_LINE_EGPIO15);
813         gpio_free(EP93XX_GPIO_LINE_EGPIO2);
814 
815 
816         /* GPIO ports E[7:2], G[7:4] and H used by GPIO */
817         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
818                                EP93XX_SYSCON_DEVCFG_GONIDE |
819                                EP93XX_SYSCON_DEVCFG_HONIDE);
820 }
821 EXPORT_SYMBOL(ep93xx_ide_release_gpio);
822 
823 /*************************************************************************
824  * EP93xx Security peripheral
825  *************************************************************************/
826 
827 /*
828  * The Maverick Key is 256 bits of micro fuses blown at the factory during
829  * manufacturing to uniquely identify a part.
830  *
831  * See: http://arm.cirrus.com/forum/viewtopic.php?t=486&highlight=maverick+key
832  */
833 #define EP93XX_SECURITY_REG(x)          (EP93XX_SECURITY_BASE + (x))
834 #define EP93XX_SECURITY_SECFLG          EP93XX_SECURITY_REG(0x2400)
835 #define EP93XX_SECURITY_FUSEFLG         EP93XX_SECURITY_REG(0x2410)
836 #define EP93XX_SECURITY_UNIQID          EP93XX_SECURITY_REG(0x2440)
837 #define EP93XX_SECURITY_UNIQCHK         EP93XX_SECURITY_REG(0x2450)
838 #define EP93XX_SECURITY_UNIQVAL         EP93XX_SECURITY_REG(0x2460)
839 #define EP93XX_SECURITY_SECID1          EP93XX_SECURITY_REG(0x2500)
840 #define EP93XX_SECURITY_SECID2          EP93XX_SECURITY_REG(0x2504)
841 #define EP93XX_SECURITY_SECCHK1         EP93XX_SECURITY_REG(0x2520)
842 #define EP93XX_SECURITY_SECCHK2         EP93XX_SECURITY_REG(0x2524)
843 #define EP93XX_SECURITY_UNIQID2         EP93XX_SECURITY_REG(0x2700)
844 #define EP93XX_SECURITY_UNIQID3         EP93XX_SECURITY_REG(0x2704)
845 #define EP93XX_SECURITY_UNIQID4         EP93XX_SECURITY_REG(0x2708)
846 #define EP93XX_SECURITY_UNIQID5         EP93XX_SECURITY_REG(0x270c)
847 
848 static char ep93xx_soc_id[33];
849 
850 static const char __init *ep93xx_get_soc_id(void)
851 {
852         unsigned int id, id2, id3, id4, id5;
853 
854         if (__raw_readl(EP93XX_SECURITY_UNIQVAL) != 1)
855                 return "bad Hamming code";
856 
857         id = __raw_readl(EP93XX_SECURITY_UNIQID);
858         id2 = __raw_readl(EP93XX_SECURITY_UNIQID2);
859         id3 = __raw_readl(EP93XX_SECURITY_UNIQID3);
860         id4 = __raw_readl(EP93XX_SECURITY_UNIQID4);
861         id5 = __raw_readl(EP93XX_SECURITY_UNIQID5);
862 
863         if (id != id2)
864                 return "invalid";
865 
866         /* Toss the unique ID into the entropy pool */
867         add_device_randomness(&id2, 4);
868         add_device_randomness(&id3, 4);
869         add_device_randomness(&id4, 4);
870         add_device_randomness(&id5, 4);
871 
872         snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
873                  "%08x%08x%08x%08x", id2, id3, id4, id5);
874 
875         return ep93xx_soc_id;
876 }
877 
878 static const char __init *ep93xx_get_soc_rev(void)
879 {
880         int rev = ep93xx_chip_revision();
881 
882         switch (rev) {
883         case EP93XX_CHIP_REV_D0:
884                 return "D0";
885         case EP93XX_CHIP_REV_D1:
886                 return "D1";
887         case EP93XX_CHIP_REV_E0:
888                 return "E0";
889         case EP93XX_CHIP_REV_E1:
890                 return "E1";
891         case EP93XX_CHIP_REV_E2:
892                 return "E2";
893         default:
894                 return "unknown";
895         }
896 }
897 
898 static const char __init *ep93xx_get_machine_name(void)
899 {
900         return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
901 }
902 
903 static struct device __init *ep93xx_init_soc(void)
904 {
905         struct soc_device_attribute *soc_dev_attr;
906         struct soc_device *soc_dev;
907 
908         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
909         if (!soc_dev_attr)
910                 return NULL;
911 
912         soc_dev_attr->machine = ep93xx_get_machine_name();
913         soc_dev_attr->family = "Cirrus Logic EP93xx";
914         soc_dev_attr->revision = ep93xx_get_soc_rev();
915         soc_dev_attr->soc_id = ep93xx_get_soc_id();
916 
917         soc_dev = soc_device_register(soc_dev_attr);
918         if (IS_ERR(soc_dev)) {
919                 kfree(soc_dev_attr->machine);
920                 kfree(soc_dev_attr);
921                 return NULL;
922         }
923 
924         return soc_device_to_device(soc_dev);
925 }
926 
927 struct device __init *ep93xx_init_devices(void)
928 {
929         struct device *parent;
930 
931         /* Disallow access to MaverickCrunch initially */
932         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
933 
934         /* Default all ports to GPIO */
935         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
936                                EP93XX_SYSCON_DEVCFG_GONK |
937                                EP93XX_SYSCON_DEVCFG_EONIDE |
938                                EP93XX_SYSCON_DEVCFG_GONIDE |
939                                EP93XX_SYSCON_DEVCFG_HONIDE);
940 
941         parent = ep93xx_init_soc();
942 
943         /* Get the GPIO working early, other devices need it */
944         platform_device_register(&ep93xx_gpio_device);
945 
946         amba_device_register(&uart1_device, &iomem_resource);
947         amba_device_register(&uart2_device, &iomem_resource);
948         amba_device_register(&uart3_device, &iomem_resource);
949 
950         platform_device_register(&ep93xx_rtc_device);
951         platform_device_register(&ep93xx_ohci_device);
952         platform_device_register(&ep93xx_wdt_device);
953 
954         gpio_led_register_device(-1, &ep93xx_led_data);
955 
956         return parent;
957 }
958 
959 void ep93xx_restart(enum reboot_mode mode, const char *cmd)
960 {
961         /*
962          * Set then clear the SWRST bit to initiate a software reset
963          */
964         ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_SWRST);
965         ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_SWRST);
966 
967         while (1)
968                 ;
969 }
970 
971 void __init ep93xx_init_late(void)
972 {
973         crunch_init();
974 }
975 

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