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/uaccess.h>
26 #include <linux/termios.h>
27 #include <linux/amba/bus.h>
28 #include <linux/amba/serial.h>
29 #include <linux/mtd/physmap.h>
30 #include <linux/i2c.h>
31 #include <linux/gpio/machine.h>
32 #include <linux/spi/spi.h>
33 #include <linux/export.h>
34 #include <linux/irqchip/arm-vic.h>
35 #include <linux/reboot.h>
36 #include <linux/usb/ohci_pdriver.h>
37 #include <linux/random.h>
38
39 #include "hardware.h"
40 #include <linux/platform_data/video-ep93xx.h>
41 #include <linux/platform_data/keypad-ep93xx.h>
42 #include <linux/platform_data/spi-ep93xx.h>
43 #include <linux/soc/cirrus/ep93xx.h>
44
45 #include "gpio-ep93xx.h"
46
47 #include <asm/mach/arch.h>
48 #include <asm/mach/map.h>
49
50 #include "soc.h"
51 #include "irqs.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, IRQ_EP93XX_VIC0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
81 vic_init(EP93XX_VIC2_BASE, IRQ_EP93XX_VIC1, 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 "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 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO_AB),
145 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO0MUX),
146 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO1MUX),
147 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO2MUX),
148 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO3MUX),
149 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO4MUX),
150 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO5MUX),
151 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO6MUX),
152 DEFINE_RES_IRQ(IRQ_EP93XX_GPIO7MUX),
153 };
154
155 static struct platform_device ep93xx_gpio_device = {
156 .name = "gpio-ep93xx",
157 .id = -1,
158 .num_resources = ARRAY_SIZE(ep93xx_gpio_resource),
159 .resource = ep93xx_gpio_resource,
160 };
161
162 /*************************************************************************
163 * EP93xx peripheral handling
164 *************************************************************************/
165 #define EP93XX_UART_MCR_OFFSET (0x0100)
166
ep93xx_uart_set_mctrl(struct amba_device * dev,void __iomem * base,unsigned int mctrl)167 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
168 void __iomem *base, unsigned int mctrl)
169 {
170 unsigned int mcr;
171
172 mcr = 0;
173 if (mctrl & TIOCM_RTS)
174 mcr |= 2;
175 if (mctrl & TIOCM_DTR)
176 mcr |= 1;
177
178 __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
179 }
180
181 static struct amba_pl010_data ep93xx_uart_data = {
182 .set_mctrl = ep93xx_uart_set_mctrl,
183 };
184
185 static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
186 { IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
187
188 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
189 { IRQ_EP93XX_UART2 }, NULL);
190
191 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
192 { IRQ_EP93XX_UART3 }, &ep93xx_uart_data);
193
194 static struct resource ep93xx_rtc_resource[] = {
195 DEFINE_RES_MEM(EP93XX_RTC_PHYS_BASE, 0x10c),
196 };
197
198 static struct platform_device ep93xx_rtc_device = {
199 .name = "ep93xx-rtc",
200 .id = -1,
201 .num_resources = ARRAY_SIZE(ep93xx_rtc_resource),
202 .resource = ep93xx_rtc_resource,
203 };
204
205 /*************************************************************************
206 * EP93xx OHCI USB Host
207 *************************************************************************/
208
209 static struct clk *ep93xx_ohci_host_clock;
210
ep93xx_ohci_power_on(struct platform_device * pdev)211 static int ep93xx_ohci_power_on(struct platform_device *pdev)
212 {
213 if (!ep93xx_ohci_host_clock) {
214 ep93xx_ohci_host_clock = devm_clk_get(&pdev->dev, NULL);
215 if (IS_ERR(ep93xx_ohci_host_clock))
216 return PTR_ERR(ep93xx_ohci_host_clock);
217 }
218
219 return clk_prepare_enable(ep93xx_ohci_host_clock);
220 }
221
ep93xx_ohci_power_off(struct platform_device * pdev)222 static void ep93xx_ohci_power_off(struct platform_device *pdev)
223 {
224 clk_disable(ep93xx_ohci_host_clock);
225 }
226
227 static struct usb_ohci_pdata ep93xx_ohci_pdata = {
228 .power_on = ep93xx_ohci_power_on,
229 .power_off = ep93xx_ohci_power_off,
230 .power_suspend = ep93xx_ohci_power_off,
231 };
232
233 static struct resource ep93xx_ohci_resources[] = {
234 DEFINE_RES_MEM(EP93XX_USB_PHYS_BASE, 0x1000),
235 DEFINE_RES_IRQ(IRQ_EP93XX_USB),
236 };
237
238 static u64 ep93xx_ohci_dma_mask = DMA_BIT_MASK(32);
239
240 static struct platform_device ep93xx_ohci_device = {
241 .name = "ohci-platform",
242 .id = -1,
243 .num_resources = ARRAY_SIZE(ep93xx_ohci_resources),
244 .resource = ep93xx_ohci_resources,
245 .dev = {
246 .dma_mask = &ep93xx_ohci_dma_mask,
247 .coherent_dma_mask = DMA_BIT_MASK(32),
248 .platform_data = &ep93xx_ohci_pdata,
249 },
250 };
251
252 /*************************************************************************
253 * EP93xx physmap'ed flash
254 *************************************************************************/
255 static struct physmap_flash_data ep93xx_flash_data;
256
257 static struct resource ep93xx_flash_resource = {
258 .flags = IORESOURCE_MEM,
259 };
260
261 static struct platform_device ep93xx_flash = {
262 .name = "physmap-flash",
263 .id = 0,
264 .dev = {
265 .platform_data = &ep93xx_flash_data,
266 },
267 .num_resources = 1,
268 .resource = &ep93xx_flash_resource,
269 };
270
271 /**
272 * ep93xx_register_flash() - Register the external flash device.
273 * @width: bank width in octets
274 * @start: resource start address
275 * @size: resource size
276 */
ep93xx_register_flash(unsigned int width,resource_size_t start,resource_size_t size)277 void __init ep93xx_register_flash(unsigned int width,
278 resource_size_t start, resource_size_t size)
279 {
280 ep93xx_flash_data.width = width;
281
282 ep93xx_flash_resource.start = start;
283 ep93xx_flash_resource.end = start + size - 1;
284
285 platform_device_register(&ep93xx_flash);
286 }
287
288
289 /*************************************************************************
290 * EP93xx ethernet peripheral handling
291 *************************************************************************/
292 static struct ep93xx_eth_data ep93xx_eth_data;
293
294 static struct resource ep93xx_eth_resource[] = {
295 DEFINE_RES_MEM(EP93XX_ETHERNET_PHYS_BASE, 0x10000),
296 DEFINE_RES_IRQ(IRQ_EP93XX_ETHERNET),
297 };
298
299 static u64 ep93xx_eth_dma_mask = DMA_BIT_MASK(32);
300
301 static struct platform_device ep93xx_eth_device = {
302 .name = "ep93xx-eth",
303 .id = -1,
304 .dev = {
305 .platform_data = &ep93xx_eth_data,
306 .coherent_dma_mask = DMA_BIT_MASK(32),
307 .dma_mask = &ep93xx_eth_dma_mask,
308 },
309 .num_resources = ARRAY_SIZE(ep93xx_eth_resource),
310 .resource = ep93xx_eth_resource,
311 };
312
313 /**
314 * ep93xx_register_eth - Register the built-in ethernet platform device.
315 * @data: platform specific ethernet configuration (__initdata)
316 * @copy_addr: flag indicating that the MAC address should be copied
317 * from the IndAd registers (as programmed by the bootloader)
318 */
ep93xx_register_eth(struct ep93xx_eth_data * data,int copy_addr)319 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
320 {
321 if (copy_addr)
322 memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);
323
324 ep93xx_eth_data = *data;
325 platform_device_register(&ep93xx_eth_device);
326 }
327
328
329 /*************************************************************************
330 * EP93xx i2c peripheral handling
331 *************************************************************************/
332
333 /* All EP93xx devices use the same two GPIO pins for I2C bit-banging */
334 static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
335 .dev_id = "i2c-gpio.0",
336 .table = {
337 /* Use local offsets on gpiochip/port "G" */
338 GPIO_LOOKUP_IDX("G", 1, NULL, 0,
339 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
340 GPIO_LOOKUP_IDX("G", 0, NULL, 1,
341 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
342 },
343 };
344
345 static struct platform_device ep93xx_i2c_device = {
346 .name = "i2c-gpio",
347 .id = 0,
348 .dev = {
349 .platform_data = NULL,
350 },
351 };
352
353 /**
354 * ep93xx_register_i2c - Register the i2c platform device.
355 * @devices: platform specific i2c bus device information (__initdata)
356 * @num: the number of devices on the i2c bus
357 */
ep93xx_register_i2c(struct i2c_board_info * devices,int num)358 void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
359 {
360 /*
361 * FIXME: this just sets the two pins as non-opendrain, as no
362 * platforms tries to do that anyway. Flag the applicable lines
363 * as open drain in the GPIO_LOOKUP above and the driver or
364 * gpiolib will handle open drain/open drain emulation as need
365 * be. Right now i2c-gpio emulates open drain which is not
366 * optimal.
367 */
368 __raw_writel((0 << 1) | (0 << 0),
369 EP93XX_GPIO_EEDRIVE);
370
371 i2c_register_board_info(0, devices, num);
372 gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table);
373 platform_device_register(&ep93xx_i2c_device);
374 }
375
376 /*************************************************************************
377 * EP93xx SPI peripheral handling
378 *************************************************************************/
379 static struct ep93xx_spi_info ep93xx_spi_master_data;
380
381 static struct resource ep93xx_spi_resources[] = {
382 DEFINE_RES_MEM(EP93XX_SPI_PHYS_BASE, 0x18),
383 DEFINE_RES_IRQ(IRQ_EP93XX_SSP),
384 };
385
386 static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
387
388 static struct platform_device ep93xx_spi_device = {
389 .name = "ep93xx-spi",
390 .id = 0,
391 .dev = {
392 .platform_data = &ep93xx_spi_master_data,
393 .coherent_dma_mask = DMA_BIT_MASK(32),
394 .dma_mask = &ep93xx_spi_dma_mask,
395 },
396 .num_resources = ARRAY_SIZE(ep93xx_spi_resources),
397 .resource = ep93xx_spi_resources,
398 };
399
400 /**
401 * ep93xx_register_spi() - registers spi platform device
402 * @info: ep93xx board specific spi master info (__initdata)
403 * @devices: SPI devices to register (__initdata)
404 * @num: number of SPI devices to register
405 *
406 * This function registers platform device for the EP93xx SPI controller and
407 * also makes sure that SPI pins are muxed so that I2S is not using those pins.
408 */
ep93xx_register_spi(struct ep93xx_spi_info * info,struct spi_board_info * devices,int num)409 void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
410 struct spi_board_info *devices, int num)
411 {
412 /*
413 * When SPI is used, we need to make sure that I2S is muxed off from
414 * SPI pins.
415 */
416 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
417
418 ep93xx_spi_master_data = *info;
419 spi_register_board_info(devices, num);
420 platform_device_register(&ep93xx_spi_device);
421 }
422
423 /*************************************************************************
424 * EP93xx LEDs
425 *************************************************************************/
426 static const struct gpio_led ep93xx_led_pins[] __initconst = {
427 {
428 .name = "platform:grled",
429 .gpio = EP93XX_GPIO_LINE_GRLED,
430 }, {
431 .name = "platform:rdled",
432 .gpio = EP93XX_GPIO_LINE_RDLED,
433 },
434 };
435
436 static const struct gpio_led_platform_data ep93xx_led_data __initconst = {
437 .num_leds = ARRAY_SIZE(ep93xx_led_pins),
438 .leds = ep93xx_led_pins,
439 };
440
441 /*************************************************************************
442 * EP93xx pwm peripheral handling
443 *************************************************************************/
444 static struct resource ep93xx_pwm0_resource[] = {
445 DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE, 0x10),
446 };
447
448 static struct platform_device ep93xx_pwm0_device = {
449 .name = "ep93xx-pwm",
450 .id = 0,
451 .num_resources = ARRAY_SIZE(ep93xx_pwm0_resource),
452 .resource = ep93xx_pwm0_resource,
453 };
454
455 static struct resource ep93xx_pwm1_resource[] = {
456 DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE + 0x20, 0x10),
457 };
458
459 static struct platform_device ep93xx_pwm1_device = {
460 .name = "ep93xx-pwm",
461 .id = 1,
462 .num_resources = ARRAY_SIZE(ep93xx_pwm1_resource),
463 .resource = ep93xx_pwm1_resource,
464 };
465
ep93xx_register_pwm(int pwm0,int pwm1)466 void __init ep93xx_register_pwm(int pwm0, int pwm1)
467 {
468 if (pwm0)
469 platform_device_register(&ep93xx_pwm0_device);
470
471 /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
472 if (pwm1)
473 platform_device_register(&ep93xx_pwm1_device);
474 }
475
ep93xx_pwm_acquire_gpio(struct platform_device * pdev)476 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
477 {
478 int err;
479
480 if (pdev->id == 0) {
481 err = 0;
482 } else if (pdev->id == 1) {
483 err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
484 dev_name(&pdev->dev));
485 if (err)
486 return err;
487 err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
488 if (err)
489 goto fail;
490
491 /* PWM 1 output on EGPIO[14] */
492 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
493 } else {
494 err = -ENODEV;
495 }
496
497 return err;
498
499 fail:
500 gpio_free(EP93XX_GPIO_LINE_EGPIO14);
501 return err;
502 }
503 EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
504
ep93xx_pwm_release_gpio(struct platform_device * pdev)505 void ep93xx_pwm_release_gpio(struct platform_device *pdev)
506 {
507 if (pdev->id == 1) {
508 gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
509 gpio_free(EP93XX_GPIO_LINE_EGPIO14);
510
511 /* EGPIO[14] used for GPIO */
512 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
513 }
514 }
515 EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
516
517
518 /*************************************************************************
519 * EP93xx video peripheral handling
520 *************************************************************************/
521 static struct ep93xxfb_mach_info ep93xxfb_data;
522
523 static struct resource ep93xx_fb_resource[] = {
524 DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE, 0x800),
525 };
526
527 static struct platform_device ep93xx_fb_device = {
528 .name = "ep93xx-fb",
529 .id = -1,
530 .dev = {
531 .platform_data = &ep93xxfb_data,
532 .coherent_dma_mask = DMA_BIT_MASK(32),
533 .dma_mask = &ep93xx_fb_device.dev.coherent_dma_mask,
534 },
535 .num_resources = ARRAY_SIZE(ep93xx_fb_resource),
536 .resource = ep93xx_fb_resource,
537 };
538
539 /* The backlight use a single register in the framebuffer's register space */
540 #define EP93XX_RASTER_REG_BRIGHTNESS 0x20
541
542 static struct resource ep93xx_bl_resources[] = {
543 DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE +
544 EP93XX_RASTER_REG_BRIGHTNESS, 0x04),
545 };
546
547 static struct platform_device ep93xx_bl_device = {
548 .name = "ep93xx-bl",
549 .id = -1,
550 .num_resources = ARRAY_SIZE(ep93xx_bl_resources),
551 .resource = ep93xx_bl_resources,
552 };
553
554 /**
555 * ep93xx_register_fb - Register the framebuffer platform device.
556 * @data: platform specific framebuffer configuration (__initdata)
557 */
ep93xx_register_fb(struct ep93xxfb_mach_info * data)558 void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
559 {
560 ep93xxfb_data = *data;
561 platform_device_register(&ep93xx_fb_device);
562 platform_device_register(&ep93xx_bl_device);
563 }
564
565
566 /*************************************************************************
567 * EP93xx matrix keypad peripheral handling
568 *************************************************************************/
569 static struct ep93xx_keypad_platform_data ep93xx_keypad_data;
570
571 static struct resource ep93xx_keypad_resource[] = {
572 DEFINE_RES_MEM(EP93XX_KEY_MATRIX_PHYS_BASE, 0x0c),
573 DEFINE_RES_IRQ(IRQ_EP93XX_KEY),
574 };
575
576 static struct platform_device ep93xx_keypad_device = {
577 .name = "ep93xx-keypad",
578 .id = -1,
579 .dev = {
580 .platform_data = &ep93xx_keypad_data,
581 },
582 .num_resources = ARRAY_SIZE(ep93xx_keypad_resource),
583 .resource = ep93xx_keypad_resource,
584 };
585
586 /**
587 * ep93xx_register_keypad - Register the keypad platform device.
588 * @data: platform specific keypad configuration (__initdata)
589 */
ep93xx_register_keypad(struct ep93xx_keypad_platform_data * data)590 void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
591 {
592 ep93xx_keypad_data = *data;
593 platform_device_register(&ep93xx_keypad_device);
594 }
595
ep93xx_keypad_acquire_gpio(struct platform_device * pdev)596 int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
597 {
598 int err;
599 int i;
600
601 for (i = 0; i < 8; i++) {
602 err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
603 if (err)
604 goto fail_gpio_c;
605 err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
606 if (err)
607 goto fail_gpio_d;
608 }
609
610 /* Enable the keypad controller; GPIO ports C and D used for keypad */
611 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
612 EP93XX_SYSCON_DEVCFG_GONK);
613
614 return 0;
615
616 fail_gpio_d:
617 gpio_free(EP93XX_GPIO_LINE_C(i));
618 fail_gpio_c:
619 for (--i; i >= 0; --i) {
620 gpio_free(EP93XX_GPIO_LINE_C(i));
621 gpio_free(EP93XX_GPIO_LINE_D(i));
622 }
623 return err;
624 }
625 EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
626
ep93xx_keypad_release_gpio(struct platform_device * pdev)627 void ep93xx_keypad_release_gpio(struct platform_device *pdev)
628 {
629 int i;
630
631 for (i = 0; i < 8; i++) {
632 gpio_free(EP93XX_GPIO_LINE_C(i));
633 gpio_free(EP93XX_GPIO_LINE_D(i));
634 }
635
636 /* Disable the keypad controller; GPIO ports C and D used for GPIO */
637 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
638 EP93XX_SYSCON_DEVCFG_GONK);
639 }
640 EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
641
642 /*************************************************************************
643 * EP93xx I2S audio peripheral handling
644 *************************************************************************/
645 static struct resource ep93xx_i2s_resource[] = {
646 DEFINE_RES_MEM(EP93XX_I2S_PHYS_BASE, 0x100),
647 DEFINE_RES_IRQ(IRQ_EP93XX_SAI),
648 };
649
650 static struct platform_device ep93xx_i2s_device = {
651 .name = "ep93xx-i2s",
652 .id = -1,
653 .num_resources = ARRAY_SIZE(ep93xx_i2s_resource),
654 .resource = ep93xx_i2s_resource,
655 };
656
657 static struct platform_device ep93xx_pcm_device = {
658 .name = "ep93xx-pcm-audio",
659 .id = -1,
660 };
661
ep93xx_register_i2s(void)662 void __init ep93xx_register_i2s(void)
663 {
664 platform_device_register(&ep93xx_i2s_device);
665 platform_device_register(&ep93xx_pcm_device);
666 }
667
668 #define EP93XX_SYSCON_DEVCFG_I2S_MASK (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
669 EP93XX_SYSCON_DEVCFG_I2SONAC97)
670
671 #define EP93XX_I2SCLKDIV_MASK (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
672 EP93XX_SYSCON_I2SCLKDIV_SPOL)
673
ep93xx_i2s_acquire(void)674 int ep93xx_i2s_acquire(void)
675 {
676 unsigned val;
677
678 ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_I2SONAC97,
679 EP93XX_SYSCON_DEVCFG_I2S_MASK);
680
681 /*
682 * This is potentially racy with the clock api for i2s_mclk, sclk and
683 * lrclk. Since the i2s driver is the only user of those clocks we
684 * rely on it to prevent parallel use of this function and the
685 * clock api for the i2s clocks.
686 */
687 val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
688 val &= ~EP93XX_I2SCLKDIV_MASK;
689 val |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
690 ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
691
692 return 0;
693 }
694 EXPORT_SYMBOL(ep93xx_i2s_acquire);
695
ep93xx_i2s_release(void)696 void ep93xx_i2s_release(void)
697 {
698 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
699 }
700 EXPORT_SYMBOL(ep93xx_i2s_release);
701
702 /*************************************************************************
703 * EP93xx AC97 audio peripheral handling
704 *************************************************************************/
705 static struct resource ep93xx_ac97_resources[] = {
706 DEFINE_RES_MEM(EP93XX_AAC_PHYS_BASE, 0xac),
707 DEFINE_RES_IRQ(IRQ_EP93XX_AACINTR),
708 };
709
710 static struct platform_device ep93xx_ac97_device = {
711 .name = "ep93xx-ac97",
712 .id = -1,
713 .num_resources = ARRAY_SIZE(ep93xx_ac97_resources),
714 .resource = ep93xx_ac97_resources,
715 };
716
ep93xx_register_ac97(void)717 void __init ep93xx_register_ac97(void)
718 {
719 /*
720 * Make sure that the AC97 pins are not used by I2S.
721 */
722 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
723
724 platform_device_register(&ep93xx_ac97_device);
725 platform_device_register(&ep93xx_pcm_device);
726 }
727
728 /*************************************************************************
729 * EP93xx Watchdog
730 *************************************************************************/
731 static struct resource ep93xx_wdt_resources[] = {
732 DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
733 };
734
735 static struct platform_device ep93xx_wdt_device = {
736 .name = "ep93xx-wdt",
737 .id = -1,
738 .num_resources = ARRAY_SIZE(ep93xx_wdt_resources),
739 .resource = ep93xx_wdt_resources,
740 };
741
742 /*************************************************************************
743 * EP93xx IDE
744 *************************************************************************/
745 static struct resource ep93xx_ide_resources[] = {
746 DEFINE_RES_MEM(EP93XX_IDE_PHYS_BASE, 0x38),
747 DEFINE_RES_IRQ(IRQ_EP93XX_EXT3),
748 };
749
750 static struct platform_device ep93xx_ide_device = {
751 .name = "ep93xx-ide",
752 .id = -1,
753 .dev = {
754 .dma_mask = &ep93xx_ide_device.dev.coherent_dma_mask,
755 .coherent_dma_mask = DMA_BIT_MASK(32),
756 },
757 .num_resources = ARRAY_SIZE(ep93xx_ide_resources),
758 .resource = ep93xx_ide_resources,
759 };
760
ep93xx_register_ide(void)761 void __init ep93xx_register_ide(void)
762 {
763 platform_device_register(&ep93xx_ide_device);
764 }
765
ep93xx_ide_acquire_gpio(struct platform_device * pdev)766 int ep93xx_ide_acquire_gpio(struct platform_device *pdev)
767 {
768 int err;
769 int i;
770
771 err = gpio_request(EP93XX_GPIO_LINE_EGPIO2, dev_name(&pdev->dev));
772 if (err)
773 return err;
774 err = gpio_request(EP93XX_GPIO_LINE_EGPIO15, dev_name(&pdev->dev));
775 if (err)
776 goto fail_egpio15;
777 for (i = 2; i < 8; i++) {
778 err = gpio_request(EP93XX_GPIO_LINE_E(i), dev_name(&pdev->dev));
779 if (err)
780 goto fail_gpio_e;
781 }
782 for (i = 4; i < 8; i++) {
783 err = gpio_request(EP93XX_GPIO_LINE_G(i), dev_name(&pdev->dev));
784 if (err)
785 goto fail_gpio_g;
786 }
787 for (i = 0; i < 8; i++) {
788 err = gpio_request(EP93XX_GPIO_LINE_H(i), dev_name(&pdev->dev));
789 if (err)
790 goto fail_gpio_h;
791 }
792
793 /* GPIO ports E[7:2], G[7:4] and H used by IDE */
794 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
795 EP93XX_SYSCON_DEVCFG_GONIDE |
796 EP93XX_SYSCON_DEVCFG_HONIDE);
797 return 0;
798
799 fail_gpio_h:
800 for (--i; i >= 0; --i)
801 gpio_free(EP93XX_GPIO_LINE_H(i));
802 i = 8;
803 fail_gpio_g:
804 for (--i; i >= 4; --i)
805 gpio_free(EP93XX_GPIO_LINE_G(i));
806 i = 8;
807 fail_gpio_e:
808 for (--i; i >= 2; --i)
809 gpio_free(EP93XX_GPIO_LINE_E(i));
810 gpio_free(EP93XX_GPIO_LINE_EGPIO15);
811 fail_egpio15:
812 gpio_free(EP93XX_GPIO_LINE_EGPIO2);
813 return err;
814 }
815 EXPORT_SYMBOL(ep93xx_ide_acquire_gpio);
816
ep93xx_ide_release_gpio(struct platform_device * pdev)817 void ep93xx_ide_release_gpio(struct platform_device *pdev)
818 {
819 int i;
820
821 for (i = 2; i < 8; i++)
822 gpio_free(EP93XX_GPIO_LINE_E(i));
823 for (i = 4; i < 8; i++)
824 gpio_free(EP93XX_GPIO_LINE_G(i));
825 for (i = 0; i < 8; i++)
826 gpio_free(EP93XX_GPIO_LINE_H(i));
827 gpio_free(EP93XX_GPIO_LINE_EGPIO15);
828 gpio_free(EP93XX_GPIO_LINE_EGPIO2);
829
830
831 /* GPIO ports E[7:2], G[7:4] and H used by GPIO */
832 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
833 EP93XX_SYSCON_DEVCFG_GONIDE |
834 EP93XX_SYSCON_DEVCFG_HONIDE);
835 }
836 EXPORT_SYMBOL(ep93xx_ide_release_gpio);
837
838 /*************************************************************************
839 * EP93xx ADC
840 *************************************************************************/
841 static struct resource ep93xx_adc_resources[] = {
842 DEFINE_RES_MEM(EP93XX_ADC_PHYS_BASE, 0x28),
843 DEFINE_RES_IRQ(IRQ_EP93XX_TOUCH),
844 };
845
846 static struct platform_device ep93xx_adc_device = {
847 .name = "ep93xx-adc",
848 .id = -1,
849 .num_resources = ARRAY_SIZE(ep93xx_adc_resources),
850 .resource = ep93xx_adc_resources,
851 };
852
ep93xx_register_adc(void)853 void __init ep93xx_register_adc(void)
854 {
855 /* Power up ADC, deactivate Touch Screen Controller */
856 ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_TIN,
857 EP93XX_SYSCON_DEVCFG_ADCPD);
858
859 platform_device_register(&ep93xx_adc_device);
860 }
861
862 /*************************************************************************
863 * EP93xx Security peripheral
864 *************************************************************************/
865
866 /*
867 * The Maverick Key is 256 bits of micro fuses blown at the factory during
868 * manufacturing to uniquely identify a part.
869 *
870 * See: http://arm.cirrus.com/forum/viewtopic.php?t=486&highlight=maverick+key
871 */
872 #define EP93XX_SECURITY_REG(x) (EP93XX_SECURITY_BASE + (x))
873 #define EP93XX_SECURITY_SECFLG EP93XX_SECURITY_REG(0x2400)
874 #define EP93XX_SECURITY_FUSEFLG EP93XX_SECURITY_REG(0x2410)
875 #define EP93XX_SECURITY_UNIQID EP93XX_SECURITY_REG(0x2440)
876 #define EP93XX_SECURITY_UNIQCHK EP93XX_SECURITY_REG(0x2450)
877 #define EP93XX_SECURITY_UNIQVAL EP93XX_SECURITY_REG(0x2460)
878 #define EP93XX_SECURITY_SECID1 EP93XX_SECURITY_REG(0x2500)
879 #define EP93XX_SECURITY_SECID2 EP93XX_SECURITY_REG(0x2504)
880 #define EP93XX_SECURITY_SECCHK1 EP93XX_SECURITY_REG(0x2520)
881 #define EP93XX_SECURITY_SECCHK2 EP93XX_SECURITY_REG(0x2524)
882 #define EP93XX_SECURITY_UNIQID2 EP93XX_SECURITY_REG(0x2700)
883 #define EP93XX_SECURITY_UNIQID3 EP93XX_SECURITY_REG(0x2704)
884 #define EP93XX_SECURITY_UNIQID4 EP93XX_SECURITY_REG(0x2708)
885 #define EP93XX_SECURITY_UNIQID5 EP93XX_SECURITY_REG(0x270c)
886
887 static char ep93xx_soc_id[33];
888
ep93xx_get_soc_id(void)889 static const char __init *ep93xx_get_soc_id(void)
890 {
891 unsigned int id, id2, id3, id4, id5;
892
893 if (__raw_readl(EP93XX_SECURITY_UNIQVAL) != 1)
894 return "bad Hamming code";
895
896 id = __raw_readl(EP93XX_SECURITY_UNIQID);
897 id2 = __raw_readl(EP93XX_SECURITY_UNIQID2);
898 id3 = __raw_readl(EP93XX_SECURITY_UNIQID3);
899 id4 = __raw_readl(EP93XX_SECURITY_UNIQID4);
900 id5 = __raw_readl(EP93XX_SECURITY_UNIQID5);
901
902 if (id != id2)
903 return "invalid";
904
905 /* Toss the unique ID into the entropy pool */
906 add_device_randomness(&id2, 4);
907 add_device_randomness(&id3, 4);
908 add_device_randomness(&id4, 4);
909 add_device_randomness(&id5, 4);
910
911 snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
912 "%08x%08x%08x%08x", id2, id3, id4, id5);
913
914 return ep93xx_soc_id;
915 }
916
ep93xx_get_soc_rev(void)917 static const char __init *ep93xx_get_soc_rev(void)
918 {
919 int rev = ep93xx_chip_revision();
920
921 switch (rev) {
922 case EP93XX_CHIP_REV_D0:
923 return "D0";
924 case EP93XX_CHIP_REV_D1:
925 return "D1";
926 case EP93XX_CHIP_REV_E0:
927 return "E0";
928 case EP93XX_CHIP_REV_E1:
929 return "E1";
930 case EP93XX_CHIP_REV_E2:
931 return "E2";
932 default:
933 return "unknown";
934 }
935 }
936
ep93xx_get_machine_name(void)937 static const char __init *ep93xx_get_machine_name(void)
938 {
939 return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
940 }
941
ep93xx_init_soc(void)942 static struct device __init *ep93xx_init_soc(void)
943 {
944 struct soc_device_attribute *soc_dev_attr;
945 struct soc_device *soc_dev;
946
947 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
948 if (!soc_dev_attr)
949 return NULL;
950
951 soc_dev_attr->machine = ep93xx_get_machine_name();
952 soc_dev_attr->family = "Cirrus Logic EP93xx";
953 soc_dev_attr->revision = ep93xx_get_soc_rev();
954 soc_dev_attr->soc_id = ep93xx_get_soc_id();
955
956 soc_dev = soc_device_register(soc_dev_attr);
957 if (IS_ERR(soc_dev)) {
958 kfree(soc_dev_attr->machine);
959 kfree(soc_dev_attr);
960 return NULL;
961 }
962
963 return soc_device_to_device(soc_dev);
964 }
965
ep93xx_init_devices(void)966 struct device __init *ep93xx_init_devices(void)
967 {
968 struct device *parent;
969
970 /* Disallow access to MaverickCrunch initially */
971 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
972
973 /* Default all ports to GPIO */
974 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
975 EP93XX_SYSCON_DEVCFG_GONK |
976 EP93XX_SYSCON_DEVCFG_EONIDE |
977 EP93XX_SYSCON_DEVCFG_GONIDE |
978 EP93XX_SYSCON_DEVCFG_HONIDE);
979
980 parent = ep93xx_init_soc();
981
982 /* Get the GPIO working early, other devices need it */
983 platform_device_register(&ep93xx_gpio_device);
984
985 amba_device_register(&uart1_device, &iomem_resource);
986 amba_device_register(&uart2_device, &iomem_resource);
987 amba_device_register(&uart3_device, &iomem_resource);
988
989 platform_device_register(&ep93xx_rtc_device);
990 platform_device_register(&ep93xx_ohci_device);
991 platform_device_register(&ep93xx_wdt_device);
992
993 gpio_led_register_device(-1, &ep93xx_led_data);
994
995 return parent;
996 }
997
ep93xx_restart(enum reboot_mode mode,const char * cmd)998 void ep93xx_restart(enum reboot_mode mode, const char *cmd)
999 {
1000 /*
1001 * Set then clear the SWRST bit to initiate a software reset
1002 */
1003 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1004 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_SWRST);
1005
1006 while (1)
1007 ;
1008 }
1009