• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
ep93xx_map_io(void)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  *************************************************************************/
ep93xx_init_irq(void)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 
ep93xx_syscon_swlocked_write(unsigned int val,void __iomem * reg)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 
ep93xx_devcfg_set_clear(unsigned int set_bits,unsigned int clear_bits)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  */
ep93xx_chip_revision(void)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 
ep93xx_uart_set_mctrl(struct amba_device * dev,void __iomem * base,unsigned int mctrl)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 
ep93xx_ohci_power_on(struct platform_device * pdev)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 
ep93xx_ohci_power_off(struct platform_device * pdev)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  */
ep93xx_register_flash(unsigned int width,resource_size_t start,resource_size_t size)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  */
ep93xx_register_eth(struct ep93xx_eth_data * data,int copy_addr)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  */
ep93xx_register_i2c(struct i2c_gpio_platform_data * data,struct i2c_board_info * devices,int num)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  */
ep93xx_register_spi(struct ep93xx_spi_info * info,struct spi_board_info * devices,int num)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 
ep93xx_register_pwm(int pwm0,int pwm1)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 
ep93xx_pwm_acquire_gpio(struct platform_device * pdev)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 
ep93xx_pwm_release_gpio(struct platform_device * pdev)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  */
ep93xx_register_fb(struct ep93xxfb_mach_info * data)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  */
ep93xx_register_keypad(struct ep93xx_keypad_platform_data * data)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 
ep93xx_keypad_acquire_gpio(struct platform_device * pdev)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 
ep93xx_keypad_release_gpio(struct platform_device * pdev)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 
ep93xx_register_i2s(void)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 
ep93xx_i2s_acquire(void)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 
ep93xx_i2s_release(void)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 
ep93xx_register_ac97(void)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 
ep93xx_register_ide(void)746 void __init ep93xx_register_ide(void)
747 {
748 	platform_device_register(&ep93xx_ide_device);
749 }
750 
ep93xx_ide_acquire_gpio(struct platform_device * pdev)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 
ep93xx_ide_release_gpio(struct platform_device * pdev)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 
ep93xx_get_soc_id(void)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 
ep93xx_get_soc_rev(void)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 
ep93xx_get_machine_name(void)898 static const char __init *ep93xx_get_machine_name(void)
899 {
900 	return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
901 }
902 
ep93xx_init_soc(void)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 
ep93xx_init_devices(void)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 
ep93xx_restart(enum reboot_mode mode,const char * cmd)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 
ep93xx_init_late(void)971 void __init ep93xx_init_late(void)
972 {
973 	crunch_init();
974 }
975