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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * arch/arm/mach-ep93xx/core.c
4  * Core routines for Cirrus EP93xx chips.
5  *
6  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
7  * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
8  *
9  * Thanks go to Michael Burian and Ray Lehtiniemi for their key
10  * role in the ep93xx linux community.
11  */
12 
13 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
14 
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/interrupt.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/sys_soc.h>
21 #include <linux/irq.h>
22 #include <linux/io.h>
23 #include <linux/gpio.h>
24 #include <linux/leds.h>
25 #include <linux/termios.h>
26 #include <linux/amba/bus.h>
27 #include <linux/amba/serial.h>
28 #include <linux/mtd/physmap.h>
29 #include <linux/i2c.h>
30 #include <linux/gpio/machine.h>
31 #include <linux/spi/spi.h>
32 #include <linux/export.h>
33 #include <linux/irqchip/arm-vic.h>
34 #include <linux/reboot.h>
35 #include <linux/usb/ohci_pdriver.h>
36 #include <linux/random.h>
37 
38 #include "hardware.h"
39 #include <linux/platform_data/video-ep93xx.h>
40 #include <linux/platform_data/keypad-ep93xx.h>
41 #include <linux/platform_data/spi-ep93xx.h>
42 #include <linux/soc/cirrus/ep93xx.h>
43 
44 #include "gpio-ep93xx.h"
45 
46 #include <asm/mach/arch.h>
47 #include <asm/mach/map.h>
48 
49 #include "soc.h"
50 
51 /*************************************************************************
52  * Static I/O mappings that are needed for all EP93xx platforms
53  *************************************************************************/
54 static struct map_desc ep93xx_io_desc[] __initdata = {
55 	{
56 		.virtual	= EP93XX_AHB_VIRT_BASE,
57 		.pfn		= __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
58 		.length		= EP93XX_AHB_SIZE,
59 		.type		= MT_DEVICE,
60 	}, {
61 		.virtual	= EP93XX_APB_VIRT_BASE,
62 		.pfn		= __phys_to_pfn(EP93XX_APB_PHYS_BASE),
63 		.length		= EP93XX_APB_SIZE,
64 		.type		= MT_DEVICE,
65 	},
66 };
67 
ep93xx_map_io(void)68 void __init ep93xx_map_io(void)
69 {
70 	iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
71 }
72 
73 /*************************************************************************
74  * EP93xx IRQ handling
75  *************************************************************************/
ep93xx_init_irq(void)76 void __init ep93xx_init_irq(void)
77 {
78 	vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
79 	vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);
80 }
81 
82 
83 /*************************************************************************
84  * EP93xx System Controller Software Locked register handling
85  *************************************************************************/
86 
87 /*
88  * syscon_swlock prevents anything else from writing to the syscon
89  * block while a software locked register is being written.
90  */
91 static DEFINE_SPINLOCK(syscon_swlock);
92 
ep93xx_syscon_swlocked_write(unsigned int val,void __iomem * reg)93 void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg)
94 {
95 	unsigned long flags;
96 
97 	spin_lock_irqsave(&syscon_swlock, flags);
98 
99 	__raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
100 	__raw_writel(val, reg);
101 
102 	spin_unlock_irqrestore(&syscon_swlock, flags);
103 }
104 
ep93xx_devcfg_set_clear(unsigned int set_bits,unsigned int clear_bits)105 void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
106 {
107 	unsigned long flags;
108 	unsigned int val;
109 
110 	spin_lock_irqsave(&syscon_swlock, flags);
111 
112 	val = __raw_readl(EP93XX_SYSCON_DEVCFG);
113 	val &= ~clear_bits;
114 	val |= set_bits;
115 	__raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
116 	__raw_writel(val, EP93XX_SYSCON_DEVCFG);
117 
118 	spin_unlock_irqrestore(&syscon_swlock, flags);
119 }
120 
121 /**
122  * ep93xx_chip_revision() - returns the EP93xx chip revision
123  *
124  * See "platform.h" for more information.
125  */
ep93xx_chip_revision(void)126 unsigned int ep93xx_chip_revision(void)
127 {
128 	unsigned int v;
129 
130 	v = __raw_readl(EP93XX_SYSCON_SYSCFG);
131 	v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
132 	v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
133 	return v;
134 }
135 EXPORT_SYMBOL_GPL(ep93xx_chip_revision);
136 
137 /*************************************************************************
138  * EP93xx GPIO
139  *************************************************************************/
140 static struct resource ep93xx_gpio_resource[] = {
141 	DEFINE_RES_MEM(EP93XX_GPIO_PHYS_BASE, 0xcc),
142 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO_AB),
143 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO0MUX),
144 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO1MUX),
145 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO2MUX),
146 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO3MUX),
147 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO4MUX),
148 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO5MUX),
149 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO6MUX),
150 	DEFINE_RES_IRQ(IRQ_EP93XX_GPIO7MUX),
151 };
152 
153 static struct platform_device ep93xx_gpio_device = {
154 	.name		= "gpio-ep93xx",
155 	.id		= -1,
156 	.num_resources	= ARRAY_SIZE(ep93xx_gpio_resource),
157 	.resource	= ep93xx_gpio_resource,
158 };
159 
160 /*************************************************************************
161  * EP93xx peripheral handling
162  *************************************************************************/
163 #define EP93XX_UART_MCR_OFFSET		(0x0100)
164 
ep93xx_uart_set_mctrl(struct amba_device * dev,void __iomem * base,unsigned int mctrl)165 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
166 				  void __iomem *base, unsigned int mctrl)
167 {
168 	unsigned int mcr;
169 
170 	mcr = 0;
171 	if (mctrl & TIOCM_RTS)
172 		mcr |= 2;
173 	if (mctrl & TIOCM_DTR)
174 		mcr |= 1;
175 
176 	__raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
177 }
178 
179 static struct amba_pl010_data ep93xx_uart_data = {
180 	.set_mctrl	= ep93xx_uart_set_mctrl,
181 };
182 
183 static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
184 	{ IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
185 
186 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
187 	{ IRQ_EP93XX_UART2 }, NULL);
188 
189 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
190 	{ IRQ_EP93XX_UART3 }, &ep93xx_uart_data);
191 
192 static struct resource ep93xx_rtc_resource[] = {
193 	DEFINE_RES_MEM(EP93XX_RTC_PHYS_BASE, 0x10c),
194 };
195 
196 static struct platform_device ep93xx_rtc_device = {
197 	.name		= "ep93xx-rtc",
198 	.id		= -1,
199 	.num_resources	= ARRAY_SIZE(ep93xx_rtc_resource),
200 	.resource	= ep93xx_rtc_resource,
201 };
202 
203 /*************************************************************************
204  * EP93xx OHCI USB Host
205  *************************************************************************/
206 
207 static struct clk *ep93xx_ohci_host_clock;
208 
ep93xx_ohci_power_on(struct platform_device * pdev)209 static int ep93xx_ohci_power_on(struct platform_device *pdev)
210 {
211 	if (!ep93xx_ohci_host_clock) {
212 		ep93xx_ohci_host_clock = devm_clk_get(&pdev->dev, NULL);
213 		if (IS_ERR(ep93xx_ohci_host_clock))
214 			return PTR_ERR(ep93xx_ohci_host_clock);
215 	}
216 
217 	return clk_enable(ep93xx_ohci_host_clock);
218 }
219 
ep93xx_ohci_power_off(struct platform_device * pdev)220 static void ep93xx_ohci_power_off(struct platform_device *pdev)
221 {
222 	clk_disable(ep93xx_ohci_host_clock);
223 }
224 
225 static struct usb_ohci_pdata ep93xx_ohci_pdata = {
226 	.power_on	= ep93xx_ohci_power_on,
227 	.power_off	= ep93xx_ohci_power_off,
228 	.power_suspend	= ep93xx_ohci_power_off,
229 };
230 
231 static struct resource ep93xx_ohci_resources[] = {
232 	DEFINE_RES_MEM(EP93XX_USB_PHYS_BASE, 0x1000),
233 	DEFINE_RES_IRQ(IRQ_EP93XX_USB),
234 };
235 
236 static u64 ep93xx_ohci_dma_mask = DMA_BIT_MASK(32);
237 
238 static struct platform_device ep93xx_ohci_device = {
239 	.name		= "ohci-platform",
240 	.id		= -1,
241 	.num_resources	= ARRAY_SIZE(ep93xx_ohci_resources),
242 	.resource	= ep93xx_ohci_resources,
243 	.dev		= {
244 		.dma_mask		= &ep93xx_ohci_dma_mask,
245 		.coherent_dma_mask	= DMA_BIT_MASK(32),
246 		.platform_data		= &ep93xx_ohci_pdata,
247 	},
248 };
249 
250 /*************************************************************************
251  * EP93xx physmap'ed flash
252  *************************************************************************/
253 static struct physmap_flash_data ep93xx_flash_data;
254 
255 static struct resource ep93xx_flash_resource = {
256 	.flags		= IORESOURCE_MEM,
257 };
258 
259 static struct platform_device ep93xx_flash = {
260 	.name		= "physmap-flash",
261 	.id		= 0,
262 	.dev		= {
263 		.platform_data	= &ep93xx_flash_data,
264 	},
265 	.num_resources	= 1,
266 	.resource	= &ep93xx_flash_resource,
267 };
268 
269 /**
270  * ep93xx_register_flash() - Register the external flash device.
271  * @width:	bank width in octets
272  * @start:	resource start address
273  * @size:	resource size
274  */
ep93xx_register_flash(unsigned int width,resource_size_t start,resource_size_t size)275 void __init ep93xx_register_flash(unsigned int width,
276 				  resource_size_t start, resource_size_t size)
277 {
278 	ep93xx_flash_data.width		= width;
279 
280 	ep93xx_flash_resource.start	= start;
281 	ep93xx_flash_resource.end	= start + size - 1;
282 
283 	platform_device_register(&ep93xx_flash);
284 }
285 
286 
287 /*************************************************************************
288  * EP93xx ethernet peripheral handling
289  *************************************************************************/
290 static struct ep93xx_eth_data ep93xx_eth_data;
291 
292 static struct resource ep93xx_eth_resource[] = {
293 	DEFINE_RES_MEM(EP93XX_ETHERNET_PHYS_BASE, 0x10000),
294 	DEFINE_RES_IRQ(IRQ_EP93XX_ETHERNET),
295 };
296 
297 static u64 ep93xx_eth_dma_mask = DMA_BIT_MASK(32);
298 
299 static struct platform_device ep93xx_eth_device = {
300 	.name		= "ep93xx-eth",
301 	.id		= -1,
302 	.dev		= {
303 		.platform_data		= &ep93xx_eth_data,
304 		.coherent_dma_mask	= DMA_BIT_MASK(32),
305 		.dma_mask		= &ep93xx_eth_dma_mask,
306 	},
307 	.num_resources	= ARRAY_SIZE(ep93xx_eth_resource),
308 	.resource	= ep93xx_eth_resource,
309 };
310 
311 /**
312  * ep93xx_register_eth - Register the built-in ethernet platform device.
313  * @data:	platform specific ethernet configuration (__initdata)
314  * @copy_addr:	flag indicating that the MAC address should be copied
315  *		from the IndAd registers (as programmed by the bootloader)
316  */
ep93xx_register_eth(struct ep93xx_eth_data * data,int copy_addr)317 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
318 {
319 	if (copy_addr)
320 		memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);
321 
322 	ep93xx_eth_data = *data;
323 	platform_device_register(&ep93xx_eth_device);
324 }
325 
326 
327 /*************************************************************************
328  * EP93xx i2c peripheral handling
329  *************************************************************************/
330 
331 /* All EP93xx devices use the same two GPIO pins for I2C bit-banging */
332 static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
333 	.dev_id		= "i2c-gpio.0",
334 	.table		= {
335 		/* Use local offsets on gpiochip/port "G" */
336 		GPIO_LOOKUP_IDX("G", 1, NULL, 0,
337 				GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
338 		GPIO_LOOKUP_IDX("G", 0, NULL, 1,
339 				GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
340 		{ }
341 	},
342 };
343 
344 static struct platform_device ep93xx_i2c_device = {
345 	.name		= "i2c-gpio",
346 	.id		= 0,
347 	.dev		= {
348 		.platform_data	= NULL,
349 	},
350 };
351 
352 /**
353  * ep93xx_register_i2c - Register the i2c platform device.
354  * @devices:	platform specific i2c bus device information (__initdata)
355  * @num:	the number of devices on the i2c bus
356  */
ep93xx_register_i2c(struct i2c_board_info * devices,int num)357 void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
358 {
359 	/*
360 	 * FIXME: this just sets the two pins as non-opendrain, as no
361 	 * platforms tries to do that anyway. Flag the applicable lines
362 	 * as open drain in the GPIO_LOOKUP above and the driver or
363 	 * gpiolib will handle open drain/open drain emulation as need
364 	 * be. Right now i2c-gpio emulates open drain which is not
365 	 * optimal.
366 	 */
367 	__raw_writel((0 << 1) | (0 << 0),
368 		     EP93XX_GPIO_EEDRIVE);
369 
370 	i2c_register_board_info(0, devices, num);
371 	gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table);
372 	platform_device_register(&ep93xx_i2c_device);
373 }
374 
375 /*************************************************************************
376  * EP93xx SPI peripheral handling
377  *************************************************************************/
378 static struct ep93xx_spi_info ep93xx_spi_master_data;
379 
380 static struct resource ep93xx_spi_resources[] = {
381 	DEFINE_RES_MEM(EP93XX_SPI_PHYS_BASE, 0x18),
382 	DEFINE_RES_IRQ(IRQ_EP93XX_SSP),
383 };
384 
385 static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
386 
387 static struct platform_device ep93xx_spi_device = {
388 	.name		= "ep93xx-spi",
389 	.id		= 0,
390 	.dev		= {
391 		.platform_data		= &ep93xx_spi_master_data,
392 		.coherent_dma_mask	= DMA_BIT_MASK(32),
393 		.dma_mask		= &ep93xx_spi_dma_mask,
394 	},
395 	.num_resources	= ARRAY_SIZE(ep93xx_spi_resources),
396 	.resource	= ep93xx_spi_resources,
397 };
398 
399 /**
400  * ep93xx_register_spi() - registers spi platform device
401  * @info: ep93xx board specific spi master info (__initdata)
402  * @devices: SPI devices to register (__initdata)
403  * @num: number of SPI devices to register
404  *
405  * This function registers platform device for the EP93xx SPI controller and
406  * also makes sure that SPI pins are muxed so that I2S is not using those pins.
407  */
ep93xx_register_spi(struct ep93xx_spi_info * info,struct spi_board_info * devices,int num)408 void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
409 				struct spi_board_info *devices, int num)
410 {
411 	/*
412 	 * When SPI is used, we need to make sure that I2S is muxed off from
413 	 * SPI pins.
414 	 */
415 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
416 
417 	ep93xx_spi_master_data = *info;
418 	spi_register_board_info(devices, num);
419 	platform_device_register(&ep93xx_spi_device);
420 }
421 
422 /*************************************************************************
423  * EP93xx LEDs
424  *************************************************************************/
425 static const struct gpio_led ep93xx_led_pins[] __initconst = {
426 	{
427 		.name	= "platform:grled",
428 		.gpio	= EP93XX_GPIO_LINE_GRLED,
429 	}, {
430 		.name	= "platform:rdled",
431 		.gpio	= EP93XX_GPIO_LINE_RDLED,
432 	},
433 };
434 
435 static const struct gpio_led_platform_data ep93xx_led_data __initconst = {
436 	.num_leds	= ARRAY_SIZE(ep93xx_led_pins),
437 	.leds		= ep93xx_led_pins,
438 };
439 
440 /*************************************************************************
441  * EP93xx pwm peripheral handling
442  *************************************************************************/
443 static struct resource ep93xx_pwm0_resource[] = {
444 	DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE, 0x10),
445 };
446 
447 static struct platform_device ep93xx_pwm0_device = {
448 	.name		= "ep93xx-pwm",
449 	.id		= 0,
450 	.num_resources	= ARRAY_SIZE(ep93xx_pwm0_resource),
451 	.resource	= ep93xx_pwm0_resource,
452 };
453 
454 static struct resource ep93xx_pwm1_resource[] = {
455 	DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE + 0x20, 0x10),
456 };
457 
458 static struct platform_device ep93xx_pwm1_device = {
459 	.name		= "ep93xx-pwm",
460 	.id		= 1,
461 	.num_resources	= ARRAY_SIZE(ep93xx_pwm1_resource),
462 	.resource	= ep93xx_pwm1_resource,
463 };
464 
ep93xx_register_pwm(int pwm0,int pwm1)465 void __init ep93xx_register_pwm(int pwm0, int pwm1)
466 {
467 	if (pwm0)
468 		platform_device_register(&ep93xx_pwm0_device);
469 
470 	/* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
471 	if (pwm1)
472 		platform_device_register(&ep93xx_pwm1_device);
473 }
474 
ep93xx_pwm_acquire_gpio(struct platform_device * pdev)475 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
476 {
477 	int err;
478 
479 	if (pdev->id == 0) {
480 		err = 0;
481 	} else if (pdev->id == 1) {
482 		err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
483 				   dev_name(&pdev->dev));
484 		if (err)
485 			return err;
486 		err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
487 		if (err)
488 			goto fail;
489 
490 		/* PWM 1 output on EGPIO[14] */
491 		ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
492 	} else {
493 		err = -ENODEV;
494 	}
495 
496 	return err;
497 
498 fail:
499 	gpio_free(EP93XX_GPIO_LINE_EGPIO14);
500 	return err;
501 }
502 EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
503 
ep93xx_pwm_release_gpio(struct platform_device * pdev)504 void ep93xx_pwm_release_gpio(struct platform_device *pdev)
505 {
506 	if (pdev->id == 1) {
507 		gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
508 		gpio_free(EP93XX_GPIO_LINE_EGPIO14);
509 
510 		/* EGPIO[14] used for GPIO */
511 		ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
512 	}
513 }
514 EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
515 
516 
517 /*************************************************************************
518  * EP93xx video peripheral handling
519  *************************************************************************/
520 static struct ep93xxfb_mach_info ep93xxfb_data;
521 
522 static struct resource ep93xx_fb_resource[] = {
523 	DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE, 0x800),
524 };
525 
526 static struct platform_device ep93xx_fb_device = {
527 	.name			= "ep93xx-fb",
528 	.id			= -1,
529 	.dev			= {
530 		.platform_data		= &ep93xxfb_data,
531 		.coherent_dma_mask	= DMA_BIT_MASK(32),
532 		.dma_mask		= &ep93xx_fb_device.dev.coherent_dma_mask,
533 	},
534 	.num_resources		= ARRAY_SIZE(ep93xx_fb_resource),
535 	.resource		= ep93xx_fb_resource,
536 };
537 
538 /* The backlight use a single register in the framebuffer's register space */
539 #define EP93XX_RASTER_REG_BRIGHTNESS 0x20
540 
541 static struct resource ep93xx_bl_resources[] = {
542 	DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE +
543 		       EP93XX_RASTER_REG_BRIGHTNESS, 0x04),
544 };
545 
546 static struct platform_device ep93xx_bl_device = {
547 	.name		= "ep93xx-bl",
548 	.id		= -1,
549 	.num_resources	= ARRAY_SIZE(ep93xx_bl_resources),
550 	.resource	= ep93xx_bl_resources,
551 };
552 
553 /**
554  * ep93xx_register_fb - Register the framebuffer platform device.
555  * @data:	platform specific framebuffer configuration (__initdata)
556  */
ep93xx_register_fb(struct ep93xxfb_mach_info * data)557 void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
558 {
559 	ep93xxfb_data = *data;
560 	platform_device_register(&ep93xx_fb_device);
561 	platform_device_register(&ep93xx_bl_device);
562 }
563 
564 
565 /*************************************************************************
566  * EP93xx matrix keypad peripheral handling
567  *************************************************************************/
568 static struct ep93xx_keypad_platform_data ep93xx_keypad_data;
569 
570 static struct resource ep93xx_keypad_resource[] = {
571 	DEFINE_RES_MEM(EP93XX_KEY_MATRIX_PHYS_BASE, 0x0c),
572 	DEFINE_RES_IRQ(IRQ_EP93XX_KEY),
573 };
574 
575 static struct platform_device ep93xx_keypad_device = {
576 	.name		= "ep93xx-keypad",
577 	.id		= -1,
578 	.dev		= {
579 		.platform_data	= &ep93xx_keypad_data,
580 	},
581 	.num_resources	= ARRAY_SIZE(ep93xx_keypad_resource),
582 	.resource	= ep93xx_keypad_resource,
583 };
584 
585 /**
586  * ep93xx_register_keypad - Register the keypad platform device.
587  * @data:	platform specific keypad configuration (__initdata)
588  */
ep93xx_register_keypad(struct ep93xx_keypad_platform_data * data)589 void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
590 {
591 	ep93xx_keypad_data = *data;
592 	platform_device_register(&ep93xx_keypad_device);
593 }
594 
ep93xx_keypad_acquire_gpio(struct platform_device * pdev)595 int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
596 {
597 	int err;
598 	int i;
599 
600 	for (i = 0; i < 8; i++) {
601 		err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
602 		if (err)
603 			goto fail_gpio_c;
604 		err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
605 		if (err)
606 			goto fail_gpio_d;
607 	}
608 
609 	/* Enable the keypad controller; GPIO ports C and D used for keypad */
610 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
611 				 EP93XX_SYSCON_DEVCFG_GONK);
612 
613 	return 0;
614 
615 fail_gpio_d:
616 	gpio_free(EP93XX_GPIO_LINE_C(i));
617 fail_gpio_c:
618 	for (--i; i >= 0; --i) {
619 		gpio_free(EP93XX_GPIO_LINE_C(i));
620 		gpio_free(EP93XX_GPIO_LINE_D(i));
621 	}
622 	return err;
623 }
624 EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
625 
ep93xx_keypad_release_gpio(struct platform_device * pdev)626 void ep93xx_keypad_release_gpio(struct platform_device *pdev)
627 {
628 	int i;
629 
630 	for (i = 0; i < 8; i++) {
631 		gpio_free(EP93XX_GPIO_LINE_C(i));
632 		gpio_free(EP93XX_GPIO_LINE_D(i));
633 	}
634 
635 	/* Disable the keypad controller; GPIO ports C and D used for GPIO */
636 	ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
637 			       EP93XX_SYSCON_DEVCFG_GONK);
638 }
639 EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
640 
641 /*************************************************************************
642  * EP93xx I2S audio peripheral handling
643  *************************************************************************/
644 static struct resource ep93xx_i2s_resource[] = {
645 	DEFINE_RES_MEM(EP93XX_I2S_PHYS_BASE, 0x100),
646 	DEFINE_RES_IRQ(IRQ_EP93XX_SAI),
647 };
648 
649 static struct platform_device ep93xx_i2s_device = {
650 	.name		= "ep93xx-i2s",
651 	.id		= -1,
652 	.num_resources	= ARRAY_SIZE(ep93xx_i2s_resource),
653 	.resource	= ep93xx_i2s_resource,
654 };
655 
656 static struct platform_device ep93xx_pcm_device = {
657 	.name		= "ep93xx-pcm-audio",
658 	.id		= -1,
659 };
660 
ep93xx_register_i2s(void)661 void __init ep93xx_register_i2s(void)
662 {
663 	platform_device_register(&ep93xx_i2s_device);
664 	platform_device_register(&ep93xx_pcm_device);
665 }
666 
667 #define EP93XX_SYSCON_DEVCFG_I2S_MASK	(EP93XX_SYSCON_DEVCFG_I2SONSSP | \
668 					 EP93XX_SYSCON_DEVCFG_I2SONAC97)
669 
670 #define EP93XX_I2SCLKDIV_MASK		(EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
671 					 EP93XX_SYSCON_I2SCLKDIV_SPOL)
672 
ep93xx_i2s_acquire(void)673 int ep93xx_i2s_acquire(void)
674 {
675 	unsigned val;
676 
677 	ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_I2SONAC97,
678 			EP93XX_SYSCON_DEVCFG_I2S_MASK);
679 
680 	/*
681 	 * This is potentially racy with the clock api for i2s_mclk, sclk and
682 	 * lrclk. Since the i2s driver is the only user of those clocks we
683 	 * rely on it to prevent parallel use of this function and the
684 	 * clock api for the i2s clocks.
685 	 */
686 	val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
687 	val &= ~EP93XX_I2SCLKDIV_MASK;
688 	val |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
689 	ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
690 
691 	return 0;
692 }
693 EXPORT_SYMBOL(ep93xx_i2s_acquire);
694 
ep93xx_i2s_release(void)695 void ep93xx_i2s_release(void)
696 {
697 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
698 }
699 EXPORT_SYMBOL(ep93xx_i2s_release);
700 
701 /*************************************************************************
702  * EP93xx AC97 audio peripheral handling
703  *************************************************************************/
704 static struct resource ep93xx_ac97_resources[] = {
705 	DEFINE_RES_MEM(EP93XX_AAC_PHYS_BASE, 0xac),
706 	DEFINE_RES_IRQ(IRQ_EP93XX_AACINTR),
707 };
708 
709 static struct platform_device ep93xx_ac97_device = {
710 	.name		= "ep93xx-ac97",
711 	.id		= -1,
712 	.num_resources	= ARRAY_SIZE(ep93xx_ac97_resources),
713 	.resource	= ep93xx_ac97_resources,
714 };
715 
ep93xx_register_ac97(void)716 void __init ep93xx_register_ac97(void)
717 {
718 	/*
719 	 * Make sure that the AC97 pins are not used by I2S.
720 	 */
721 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
722 
723 	platform_device_register(&ep93xx_ac97_device);
724 	platform_device_register(&ep93xx_pcm_device);
725 }
726 
727 /*************************************************************************
728  * EP93xx Watchdog
729  *************************************************************************/
730 static struct resource ep93xx_wdt_resources[] = {
731 	DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
732 };
733 
734 static struct platform_device ep93xx_wdt_device = {
735 	.name		= "ep93xx-wdt",
736 	.id		= -1,
737 	.num_resources	= ARRAY_SIZE(ep93xx_wdt_resources),
738 	.resource	= ep93xx_wdt_resources,
739 };
740 
741 /*************************************************************************
742  * EP93xx IDE
743  *************************************************************************/
744 static struct resource ep93xx_ide_resources[] = {
745 	DEFINE_RES_MEM(EP93XX_IDE_PHYS_BASE, 0x38),
746 	DEFINE_RES_IRQ(IRQ_EP93XX_EXT3),
747 };
748 
749 static struct platform_device ep93xx_ide_device = {
750 	.name		= "ep93xx-ide",
751 	.id		= -1,
752 	.dev		= {
753 		.dma_mask		= &ep93xx_ide_device.dev.coherent_dma_mask,
754 		.coherent_dma_mask	= DMA_BIT_MASK(32),
755 	},
756 	.num_resources	= ARRAY_SIZE(ep93xx_ide_resources),
757 	.resource	= ep93xx_ide_resources,
758 };
759 
ep93xx_register_ide(void)760 void __init ep93xx_register_ide(void)
761 {
762 	platform_device_register(&ep93xx_ide_device);
763 }
764 
ep93xx_ide_acquire_gpio(struct platform_device * pdev)765 int ep93xx_ide_acquire_gpio(struct platform_device *pdev)
766 {
767 	int err;
768 	int i;
769 
770 	err = gpio_request(EP93XX_GPIO_LINE_EGPIO2, dev_name(&pdev->dev));
771 	if (err)
772 		return err;
773 	err = gpio_request(EP93XX_GPIO_LINE_EGPIO15, dev_name(&pdev->dev));
774 	if (err)
775 		goto fail_egpio15;
776 	for (i = 2; i < 8; i++) {
777 		err = gpio_request(EP93XX_GPIO_LINE_E(i), dev_name(&pdev->dev));
778 		if (err)
779 			goto fail_gpio_e;
780 	}
781 	for (i = 4; i < 8; i++) {
782 		err = gpio_request(EP93XX_GPIO_LINE_G(i), dev_name(&pdev->dev));
783 		if (err)
784 			goto fail_gpio_g;
785 	}
786 	for (i = 0; i < 8; i++) {
787 		err = gpio_request(EP93XX_GPIO_LINE_H(i), dev_name(&pdev->dev));
788 		if (err)
789 			goto fail_gpio_h;
790 	}
791 
792 	/* GPIO ports E[7:2], G[7:4] and H used by IDE */
793 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
794 				 EP93XX_SYSCON_DEVCFG_GONIDE |
795 				 EP93XX_SYSCON_DEVCFG_HONIDE);
796 	return 0;
797 
798 fail_gpio_h:
799 	for (--i; i >= 0; --i)
800 		gpio_free(EP93XX_GPIO_LINE_H(i));
801 	i = 8;
802 fail_gpio_g:
803 	for (--i; i >= 4; --i)
804 		gpio_free(EP93XX_GPIO_LINE_G(i));
805 	i = 8;
806 fail_gpio_e:
807 	for (--i; i >= 2; --i)
808 		gpio_free(EP93XX_GPIO_LINE_E(i));
809 	gpio_free(EP93XX_GPIO_LINE_EGPIO15);
810 fail_egpio15:
811 	gpio_free(EP93XX_GPIO_LINE_EGPIO2);
812 	return err;
813 }
814 EXPORT_SYMBOL(ep93xx_ide_acquire_gpio);
815 
ep93xx_ide_release_gpio(struct platform_device * pdev)816 void ep93xx_ide_release_gpio(struct platform_device *pdev)
817 {
818 	int i;
819 
820 	for (i = 2; i < 8; i++)
821 		gpio_free(EP93XX_GPIO_LINE_E(i));
822 	for (i = 4; i < 8; i++)
823 		gpio_free(EP93XX_GPIO_LINE_G(i));
824 	for (i = 0; i < 8; i++)
825 		gpio_free(EP93XX_GPIO_LINE_H(i));
826 	gpio_free(EP93XX_GPIO_LINE_EGPIO15);
827 	gpio_free(EP93XX_GPIO_LINE_EGPIO2);
828 
829 
830 	/* GPIO ports E[7:2], G[7:4] and H used by GPIO */
831 	ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
832 			       EP93XX_SYSCON_DEVCFG_GONIDE |
833 			       EP93XX_SYSCON_DEVCFG_HONIDE);
834 }
835 EXPORT_SYMBOL(ep93xx_ide_release_gpio);
836 
837 /*************************************************************************
838  * EP93xx ADC
839  *************************************************************************/
840 static struct resource ep93xx_adc_resources[] = {
841 	DEFINE_RES_MEM(EP93XX_ADC_PHYS_BASE, 0x28),
842 	DEFINE_RES_IRQ(IRQ_EP93XX_TOUCH),
843 };
844 
845 static struct platform_device ep93xx_adc_device = {
846 	.name		= "ep93xx-adc",
847 	.id		= -1,
848 	.num_resources	= ARRAY_SIZE(ep93xx_adc_resources),
849 	.resource	= ep93xx_adc_resources,
850 };
851 
ep93xx_register_adc(void)852 void __init ep93xx_register_adc(void)
853 {
854 	/* Power up ADC, deactivate Touch Screen Controller */
855 	ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_TIN,
856 				EP93XX_SYSCON_DEVCFG_ADCPD);
857 
858 	platform_device_register(&ep93xx_adc_device);
859 }
860 
861 /*************************************************************************
862  * EP93xx Security peripheral
863  *************************************************************************/
864 
865 /*
866  * The Maverick Key is 256 bits of micro fuses blown at the factory during
867  * manufacturing to uniquely identify a part.
868  *
869  * See: http://arm.cirrus.com/forum/viewtopic.php?t=486&highlight=maverick+key
870  */
871 #define EP93XX_SECURITY_REG(x)		(EP93XX_SECURITY_BASE + (x))
872 #define EP93XX_SECURITY_SECFLG		EP93XX_SECURITY_REG(0x2400)
873 #define EP93XX_SECURITY_FUSEFLG		EP93XX_SECURITY_REG(0x2410)
874 #define EP93XX_SECURITY_UNIQID		EP93XX_SECURITY_REG(0x2440)
875 #define EP93XX_SECURITY_UNIQCHK		EP93XX_SECURITY_REG(0x2450)
876 #define EP93XX_SECURITY_UNIQVAL		EP93XX_SECURITY_REG(0x2460)
877 #define EP93XX_SECURITY_SECID1		EP93XX_SECURITY_REG(0x2500)
878 #define EP93XX_SECURITY_SECID2		EP93XX_SECURITY_REG(0x2504)
879 #define EP93XX_SECURITY_SECCHK1		EP93XX_SECURITY_REG(0x2520)
880 #define EP93XX_SECURITY_SECCHK2		EP93XX_SECURITY_REG(0x2524)
881 #define EP93XX_SECURITY_UNIQID2		EP93XX_SECURITY_REG(0x2700)
882 #define EP93XX_SECURITY_UNIQID3		EP93XX_SECURITY_REG(0x2704)
883 #define EP93XX_SECURITY_UNIQID4		EP93XX_SECURITY_REG(0x2708)
884 #define EP93XX_SECURITY_UNIQID5		EP93XX_SECURITY_REG(0x270c)
885 
886 static char ep93xx_soc_id[33];
887 
ep93xx_get_soc_id(void)888 static const char __init *ep93xx_get_soc_id(void)
889 {
890 	unsigned int id, id2, id3, id4, id5;
891 
892 	if (__raw_readl(EP93XX_SECURITY_UNIQVAL) != 1)
893 		return "bad Hamming code";
894 
895 	id = __raw_readl(EP93XX_SECURITY_UNIQID);
896 	id2 = __raw_readl(EP93XX_SECURITY_UNIQID2);
897 	id3 = __raw_readl(EP93XX_SECURITY_UNIQID3);
898 	id4 = __raw_readl(EP93XX_SECURITY_UNIQID4);
899 	id5 = __raw_readl(EP93XX_SECURITY_UNIQID5);
900 
901 	if (id != id2)
902 		return "invalid";
903 
904 	/* Toss the unique ID into the entropy pool */
905 	add_device_randomness(&id2, 4);
906 	add_device_randomness(&id3, 4);
907 	add_device_randomness(&id4, 4);
908 	add_device_randomness(&id5, 4);
909 
910 	snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
911 		 "%08x%08x%08x%08x", id2, id3, id4, id5);
912 
913 	return ep93xx_soc_id;
914 }
915 
ep93xx_get_soc_rev(void)916 static const char __init *ep93xx_get_soc_rev(void)
917 {
918 	int rev = ep93xx_chip_revision();
919 
920 	switch (rev) {
921 	case EP93XX_CHIP_REV_D0:
922 		return "D0";
923 	case EP93XX_CHIP_REV_D1:
924 		return "D1";
925 	case EP93XX_CHIP_REV_E0:
926 		return "E0";
927 	case EP93XX_CHIP_REV_E1:
928 		return "E1";
929 	case EP93XX_CHIP_REV_E2:
930 		return "E2";
931 	default:
932 		return "unknown";
933 	}
934 }
935 
ep93xx_get_machine_name(void)936 static const char __init *ep93xx_get_machine_name(void)
937 {
938 	return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
939 }
940 
ep93xx_init_soc(void)941 static struct device __init *ep93xx_init_soc(void)
942 {
943 	struct soc_device_attribute *soc_dev_attr;
944 	struct soc_device *soc_dev;
945 
946 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
947 	if (!soc_dev_attr)
948 		return NULL;
949 
950 	soc_dev_attr->machine = ep93xx_get_machine_name();
951 	soc_dev_attr->family = "Cirrus Logic EP93xx";
952 	soc_dev_attr->revision = ep93xx_get_soc_rev();
953 	soc_dev_attr->soc_id = ep93xx_get_soc_id();
954 
955 	soc_dev = soc_device_register(soc_dev_attr);
956 	if (IS_ERR(soc_dev)) {
957 		kfree(soc_dev_attr->machine);
958 		kfree(soc_dev_attr);
959 		return NULL;
960 	}
961 
962 	return soc_device_to_device(soc_dev);
963 }
964 
ep93xx_init_devices(void)965 struct device __init *ep93xx_init_devices(void)
966 {
967 	struct device *parent;
968 
969 	/* Disallow access to MaverickCrunch initially */
970 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
971 
972 	/* Default all ports to GPIO */
973 	ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
974 			       EP93XX_SYSCON_DEVCFG_GONK |
975 			       EP93XX_SYSCON_DEVCFG_EONIDE |
976 			       EP93XX_SYSCON_DEVCFG_GONIDE |
977 			       EP93XX_SYSCON_DEVCFG_HONIDE);
978 
979 	parent = ep93xx_init_soc();
980 
981 	/* Get the GPIO working early, other devices need it */
982 	platform_device_register(&ep93xx_gpio_device);
983 
984 	amba_device_register(&uart1_device, &iomem_resource);
985 	amba_device_register(&uart2_device, &iomem_resource);
986 	amba_device_register(&uart3_device, &iomem_resource);
987 
988 	platform_device_register(&ep93xx_rtc_device);
989 	platform_device_register(&ep93xx_ohci_device);
990 	platform_device_register(&ep93xx_wdt_device);
991 
992 	gpio_led_register_device(-1, &ep93xx_led_data);
993 
994 	return parent;
995 }
996 
ep93xx_restart(enum reboot_mode mode,const char * cmd)997 void ep93xx_restart(enum reboot_mode mode, const char *cmd)
998 {
999 	/*
1000 	 * Set then clear the SWRST bit to initiate a software reset
1001 	 */
1002 	ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1003 	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1004 
1005 	while (1)
1006 		;
1007 }
1008 
ep93xx_init_late(void)1009 void __init ep93xx_init_late(void)
1010 {
1011 	crunch_init();
1012 }
1013