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OMAP3 SRF: Add CORE rate table param in OMAP-PM
[linux-ginger.git] / arch / arm / mach-realview / core.c
bloba2083b60e3fb9bfa9a1ec4328a7ccd513e62110c
1 /*
2 * linux/arch/arm/mach-realview/core.c
3 *
4 * Copyright (C) 1999 - 2003 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/sysdev.h>
25 #include <linux/interrupt.h>
26 #include <linux/amba/bus.h>
27 #include <linux/amba/clcd.h>
28 #include <linux/clocksource.h>
29 #include <linux/clockchips.h>
30 #include <linux/io.h>
31 #include <linux/smsc911x.h>
32 #include <linux/ata_platform.h>
33 #include <linux/amba/mmci.h>
34
35 #include <asm/clkdev.h>
36 #include <asm/system.h>
37 #include <mach/hardware.h>
38 #include <asm/irq.h>
39 #include <asm/leds.h>
40 #include <asm/mach-types.h>
41 #include <asm/hardware/arm_timer.h>
42 #include <asm/hardware/icst307.h>
43
44 #include <asm/mach/arch.h>
45 #include <asm/mach/flash.h>
46 #include <asm/mach/irq.h>
47 #include <asm/mach/map.h>
48
49 #include <asm/hardware/gic.h>
50
51 #include <mach/platform.h>
52 #include <mach/irqs.h>
53
54 #include "core.h"
55 #include "clock.h"
56
57 #define REALVIEW_REFCOUNTER (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
58
59 /* used by entry-macro.S and platsmp.c */
60 void __iomem *gic_cpu_base_addr;
61
62 /*
63 * This is the RealView sched_clock implementation. This has
64 * a resolution of 41.7ns, and a maximum value of about 179s.
65 */
66 unsigned long long sched_clock(void)
67 {
68 unsigned long long v;
69
70 v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
71 do_div(v, 3);
72
73 return v;
74 }
75
76
77 #define REALVIEW_FLASHCTRL (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
78
79 static int realview_flash_init(void)
80 {
81 u32 val;
82
83 val = __raw_readl(REALVIEW_FLASHCTRL);
84 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
85 __raw_writel(val, REALVIEW_FLASHCTRL);
86
87 return 0;
88 }
89
90 static void realview_flash_exit(void)
91 {
92 u32 val;
93
94 val = __raw_readl(REALVIEW_FLASHCTRL);
95 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
96 __raw_writel(val, REALVIEW_FLASHCTRL);
97 }
98
99 static void realview_flash_set_vpp(int on)
100 {
101 u32 val;
102
103 val = __raw_readl(REALVIEW_FLASHCTRL);
104 if (on)
105 val |= REALVIEW_FLASHPROG_FLVPPEN;
106 else
107 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
108 __raw_writel(val, REALVIEW_FLASHCTRL);
109 }
110
111 static struct flash_platform_data realview_flash_data = {
112 .map_name = "cfi_probe",
113 .width = 4,
114 .init = realview_flash_init,
115 .exit = realview_flash_exit,
116 .set_vpp = realview_flash_set_vpp,
117 };
118
119 struct platform_device realview_flash_device = {
120 .name = "armflash",
121 .id = 0,
122 .dev = {
123 .platform_data = &realview_flash_data,
124 },
125 };
126
127 int realview_flash_register(struct resource *res, u32 num)
128 {
129 realview_flash_device.resource = res;
130 realview_flash_device.num_resources = num;
131 return platform_device_register(&realview_flash_device);
132 }
133
134 static struct smsc911x_platform_config smsc911x_config = {
135 .flags = SMSC911X_USE_32BIT,
136 .irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH,
137 .irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL,
138 .phy_interface = PHY_INTERFACE_MODE_MII,
139 };
140
141 static struct platform_device realview_eth_device = {
142 .name = "smsc911x",
143 .id = 0,
144 .num_resources = 2,
145 };
146
147 int realview_eth_register(const char *name, struct resource *res)
148 {
149 if (name)
150 realview_eth_device.name = name;
151 realview_eth_device.resource = res;
152 if (strcmp(realview_eth_device.name, "smsc911x") == 0)
153 realview_eth_device.dev.platform_data = &smsc911x_config;
154
155 return platform_device_register(&realview_eth_device);
156 }
157
158 struct platform_device realview_usb_device = {
159 .name = "isp1760",
160 .num_resources = 2,
161 };
162
163 int realview_usb_register(struct resource *res)
164 {
165 realview_usb_device.resource = res;
166 return platform_device_register(&realview_usb_device);
167 }
168
169 static struct pata_platform_info pata_platform_data = {
170 .ioport_shift = 1,
171 };
172
173 static struct resource pata_resources[] = {
174 [0] = {
175 .start = REALVIEW_CF_BASE,
176 .end = REALVIEW_CF_BASE + 0xff,
177 .flags = IORESOURCE_MEM,
178 },
179 [1] = {
180 .start = REALVIEW_CF_BASE + 0x100,
181 .end = REALVIEW_CF_BASE + SZ_4K - 1,
182 .flags = IORESOURCE_MEM,
183 },
184 };
185
186 struct platform_device realview_cf_device = {
187 .name = "pata_platform",
188 .id = -1,
189 .num_resources = ARRAY_SIZE(pata_resources),
190 .resource = pata_resources,
191 .dev = {
192 .platform_data = &pata_platform_data,
193 },
194 };
195
196 static struct resource realview_i2c_resource = {
197 .start = REALVIEW_I2C_BASE,
198 .end = REALVIEW_I2C_BASE + SZ_4K - 1,
199 .flags = IORESOURCE_MEM,
200 };
201
202 struct platform_device realview_i2c_device = {
203 .name = "versatile-i2c",
204 .id = 0,
205 .num_resources = 1,
206 .resource = &realview_i2c_resource,
207 };
208
209 static struct i2c_board_info realview_i2c_board_info[] = {
210 {
211 I2C_BOARD_INFO("ds1338", 0xd0 >> 1),
212 },
213 };
214
215 static int __init realview_i2c_init(void)
216 {
217 return i2c_register_board_info(0, realview_i2c_board_info,
218 ARRAY_SIZE(realview_i2c_board_info));
219 }
220 arch_initcall(realview_i2c_init);
221
222 #define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
223
224 /*
225 * This is only used if GPIOLIB support is disabled
226 */
227 static unsigned int realview_mmc_status(struct device *dev)
228 {
229 struct amba_device *adev = container_of(dev, struct amba_device, dev);
230 u32 mask;
231
232 if (adev->res.start == REALVIEW_MMCI0_BASE)
233 mask = 1;
234 else
235 mask = 2;
236
237 return readl(REALVIEW_SYSMCI) & mask;
238 }
239
240 struct mmci_platform_data realview_mmc0_plat_data = {
241 .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
242 .status = realview_mmc_status,
243 .gpio_wp = 17,
244 .gpio_cd = 16,
245 };
246
247 struct mmci_platform_data realview_mmc1_plat_data = {
248 .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
249 .status = realview_mmc_status,
250 .gpio_wp = 19,
251 .gpio_cd = 18,
252 };
253
254 /*
255 * Clock handling
256 */
257 static const struct icst307_params realview_oscvco_params = {
258 .ref = 24000,
259 .vco_max = 200000,
260 .vd_min = 4 + 8,
261 .vd_max = 511 + 8,
262 .rd_min = 1 + 2,
263 .rd_max = 127 + 2,
264 };
265
266 static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
267 {
268 void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
269 void __iomem *sys_osc;
270 u32 val;
271
272 if (machine_is_realview_pb1176())
273 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC0_OFFSET;
274 else
275 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
276
277 val = readl(sys_osc) & ~0x7ffff;
278 val |= vco.v | (vco.r << 9) | (vco.s << 16);
279
280 writel(0xa05f, sys_lock);
281 writel(val, sys_osc);
282 writel(0, sys_lock);
283 }
284
285 static struct clk oscvco_clk = {
286 .params = &realview_oscvco_params,
287 .setvco = realview_oscvco_set,
288 };
289
290 /*
291 * These are fixed clocks.
292 */
293 static struct clk ref24_clk = {
294 .rate = 24000000,
295 };
296
297 static struct clk_lookup lookups[] = {
298 { /* UART0 */
299 .dev_id = "dev:uart0",
300 .clk = &ref24_clk,
301 }, { /* UART1 */
302 .dev_id = "dev:uart1",
303 .clk = &ref24_clk,
304 }, { /* UART2 */
305 .dev_id = "dev:uart2",
306 .clk = &ref24_clk,
307 }, { /* UART3 */
308 .dev_id = "fpga:uart3",
309 .clk = &ref24_clk,
310 }, { /* KMI0 */
311 .dev_id = "fpga:kmi0",
312 .clk = &ref24_clk,
313 }, { /* KMI1 */
314 .dev_id = "fpga:kmi1",
315 .clk = &ref24_clk,
316 }, { /* MMC0 */
317 .dev_id = "fpga:mmc0",
318 .clk = &ref24_clk,
319 }, { /* EB:CLCD */
320 .dev_id = "dev:clcd",
321 .clk = &oscvco_clk,
322 }, { /* PB:CLCD */
323 .dev_id = "issp:clcd",
324 .clk = &oscvco_clk,
325 }
326 };
327
328 static int __init clk_init(void)
329 {
330 int i;
331
332 for (i = 0; i < ARRAY_SIZE(lookups); i++)
333 clkdev_add(&lookups[i]);
334 return 0;
335 }
336 arch_initcall(clk_init);
337
338 /*
339 * CLCD support.
340 */
341 #define SYS_CLCD_NLCDIOON (1 << 2)
342 #define SYS_CLCD_VDDPOSSWITCH (1 << 3)
343 #define SYS_CLCD_PWR3V5SWITCH (1 << 4)
344 #define SYS_CLCD_ID_MASK (0x1f << 8)
345 #define SYS_CLCD_ID_SANYO_3_8 (0x00 << 8)
346 #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
347 #define SYS_CLCD_ID_EPSON_2_2 (0x02 << 8)
348 #define SYS_CLCD_ID_SANYO_2_5 (0x07 << 8)
349 #define SYS_CLCD_ID_VGA (0x1f << 8)
350
351 static struct clcd_panel vga = {
352 .mode = {
353 .name = "VGA",
354 .refresh = 60,
355 .xres = 640,
356 .yres = 480,
357 .pixclock = 39721,
358 .left_margin = 40,
359 .right_margin = 24,
360 .upper_margin = 32,
361 .lower_margin = 11,
362 .hsync_len = 96,
363 .vsync_len = 2,
364 .sync = 0,
365 .vmode = FB_VMODE_NONINTERLACED,
366 },
367 .width = -1,
368 .height = -1,
369 .tim2 = TIM2_BCD | TIM2_IPC,
370 .cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
371 .bpp = 16,
372 };
373
374 static struct clcd_panel xvga = {
375 .mode = {
376 .name = "XVGA",
377 .refresh = 60,
378 .xres = 1024,
379 .yres = 768,
380 .pixclock = 15748,
381 .left_margin = 152,
382 .right_margin = 48,
383 .upper_margin = 23,
384 .lower_margin = 3,
385 .hsync_len = 104,
386 .vsync_len = 4,
387 .sync = 0,
388 .vmode = FB_VMODE_NONINTERLACED,
389 },
390 .width = -1,
391 .height = -1,
392 .tim2 = TIM2_BCD | TIM2_IPC,
393 .cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
394 .bpp = 16,
395 };
396
397 static struct clcd_panel sanyo_3_8_in = {
398 .mode = {
399 .name = "Sanyo QVGA",
400 .refresh = 116,
401 .xres = 320,
402 .yres = 240,
403 .pixclock = 100000,
404 .left_margin = 6,
405 .right_margin = 6,
406 .upper_margin = 5,
407 .lower_margin = 5,
408 .hsync_len = 6,
409 .vsync_len = 6,
410 .sync = 0,
411 .vmode = FB_VMODE_NONINTERLACED,
412 },
413 .width = -1,
414 .height = -1,
415 .tim2 = TIM2_BCD,
416 .cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
417 .bpp = 16,
418 };
419
420 static struct clcd_panel sanyo_2_5_in = {
421 .mode = {
422 .name = "Sanyo QVGA Portrait",
423 .refresh = 116,
424 .xres = 240,
425 .yres = 320,
426 .pixclock = 100000,
427 .left_margin = 20,
428 .right_margin = 10,
429 .upper_margin = 2,
430 .lower_margin = 2,
431 .hsync_len = 10,
432 .vsync_len = 2,
433 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
434 .vmode = FB_VMODE_NONINTERLACED,
435 },
436 .width = -1,
437 .height = -1,
438 .tim2 = TIM2_IVS | TIM2_IHS | TIM2_IPC,
439 .cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
440 .bpp = 16,
441 };
442
443 static struct clcd_panel epson_2_2_in = {
444 .mode = {
445 .name = "Epson QCIF",
446 .refresh = 390,
447 .xres = 176,
448 .yres = 220,
449 .pixclock = 62500,
450 .left_margin = 3,
451 .right_margin = 2,
452 .upper_margin = 1,
453 .lower_margin = 0,
454 .hsync_len = 3,
455 .vsync_len = 2,
456 .sync = 0,
457 .vmode = FB_VMODE_NONINTERLACED,
458 },
459 .width = -1,
460 .height = -1,
461 .tim2 = TIM2_BCD | TIM2_IPC,
462 .cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
463 .bpp = 16,
464 };
465
466 /*
467 * Detect which LCD panel is connected, and return the appropriate
468 * clcd_panel structure. Note: we do not have any information on
469 * the required timings for the 8.4in panel, so we presently assume
470 * VGA timings.
471 */
472 static struct clcd_panel *realview_clcd_panel(void)
473 {
474 void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
475 struct clcd_panel *vga_panel;
476 struct clcd_panel *panel;
477 u32 val;
478
479 if (machine_is_realview_eb())
480 vga_panel = &vga;
481 else
482 vga_panel = &xvga;
483
484 val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
485 if (val == SYS_CLCD_ID_SANYO_3_8)
486 panel = &sanyo_3_8_in;
487 else if (val == SYS_CLCD_ID_SANYO_2_5)
488 panel = &sanyo_2_5_in;
489 else if (val == SYS_CLCD_ID_EPSON_2_2)
490 panel = &epson_2_2_in;
491 else if (val == SYS_CLCD_ID_VGA)
492 panel = vga_panel;
493 else {
494 printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
495 val);
496 panel = vga_panel;
497 }
498
499 return panel;
500 }
501
502 /*
503 * Disable all display connectors on the interface module.
504 */
505 static void realview_clcd_disable(struct clcd_fb *fb)
506 {
507 void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
508 u32 val;
509
510 val = readl(sys_clcd);
511 val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
512 writel(val, sys_clcd);
513 }
514
515 /*
516 * Enable the relevant connector on the interface module.
517 */
518 static void realview_clcd_enable(struct clcd_fb *fb)
519 {
520 void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
521 u32 val;
522
523 /*
524 * Enable the PSUs
525 */
526 val = readl(sys_clcd);
527 val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
528 writel(val, sys_clcd);
529 }
530
531 static int realview_clcd_setup(struct clcd_fb *fb)
532 {
533 unsigned long framesize;
534 dma_addr_t dma;
535
536 if (machine_is_realview_eb())
537 /* VGA, 16bpp */
538 framesize = 640 * 480 * 2;
539 else
540 /* XVGA, 16bpp */
541 framesize = 1024 * 768 * 2;
542
543 fb->panel = realview_clcd_panel();
544
545 fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
546 &dma, GFP_KERNEL);
547 if (!fb->fb.screen_base) {
548 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
549 return -ENOMEM;
550 }
551
552 fb->fb.fix.smem_start = dma;
553 fb->fb.fix.smem_len = framesize;
554
555 return 0;
556 }
557
558 static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
559 {
560 return dma_mmap_writecombine(&fb->dev->dev, vma,
561 fb->fb.screen_base,
562 fb->fb.fix.smem_start,
563 fb->fb.fix.smem_len);
564 }
565
566 static void realview_clcd_remove(struct clcd_fb *fb)
567 {
568 dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
569 fb->fb.screen_base, fb->fb.fix.smem_start);
570 }
571
572 struct clcd_board clcd_plat_data = {
573 .name = "RealView",
574 .check = clcdfb_check,
575 .decode = clcdfb_decode,
576 .disable = realview_clcd_disable,
577 .enable = realview_clcd_enable,
578 .setup = realview_clcd_setup,
579 .mmap = realview_clcd_mmap,
580 .remove = realview_clcd_remove,
581 };
582
583 #ifdef CONFIG_LEDS
584 #define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
585
586 void realview_leds_event(led_event_t ledevt)
587 {
588 unsigned long flags;
589 u32 val;
590 u32 led = 1 << smp_processor_id();
591
592 local_irq_save(flags);
593 val = readl(VA_LEDS_BASE);
594
595 switch (ledevt) {
596 case led_idle_start:
597 val = val & ~led;
598 break;
599
600 case led_idle_end:
601 val = val | led;
602 break;
603
604 case led_timer:
605 val = val ^ REALVIEW_SYS_LED7;
606 break;
607
608 case led_halted:
609 val = 0;
610 break;
611
612 default:
613 break;
614 }
615
616 writel(val, VA_LEDS_BASE);
617 local_irq_restore(flags);
618 }
619 #endif /* CONFIG_LEDS */
620
621 /*
622 * Where is the timer (VA)?
623 */
624 void __iomem *timer0_va_base;
625 void __iomem *timer1_va_base;
626 void __iomem *timer2_va_base;
627 void __iomem *timer3_va_base;
628
629 /*
630 * How long is the timer interval?
631 */
632 #define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10)
633 #if TIMER_INTERVAL >= 0x100000
634 #define TIMER_RELOAD (TIMER_INTERVAL >> 8)
635 #define TIMER_DIVISOR (TIMER_CTRL_DIV256)
636 #define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC)
637 #elif TIMER_INTERVAL >= 0x10000
638 #define TIMER_RELOAD (TIMER_INTERVAL >> 4) /* Divide by 16 */
639 #define TIMER_DIVISOR (TIMER_CTRL_DIV16)
640 #define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC)
641 #else
642 #define TIMER_RELOAD (TIMER_INTERVAL)
643 #define TIMER_DIVISOR (TIMER_CTRL_DIV1)
644 #define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
645 #endif
646
647 static void timer_set_mode(enum clock_event_mode mode,
648 struct clock_event_device *clk)
649 {
650 unsigned long ctrl;
651
652 switch(mode) {
653 case CLOCK_EVT_MODE_PERIODIC:
654 writel(TIMER_RELOAD, timer0_va_base + TIMER_LOAD);
655
656 ctrl = TIMER_CTRL_PERIODIC;
657 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
658 break;
659 case CLOCK_EVT_MODE_ONESHOT:
660 /* period set, and timer enabled in 'next_event' hook */
661 ctrl = TIMER_CTRL_ONESHOT;
662 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
663 break;
664 case CLOCK_EVT_MODE_UNUSED:
665 case CLOCK_EVT_MODE_SHUTDOWN:
666 default:
667 ctrl = 0;
668 }
669
670 writel(ctrl, timer0_va_base + TIMER_CTRL);
671 }
672
673 static int timer_set_next_event(unsigned long evt,
674 struct clock_event_device *unused)
675 {
676 unsigned long ctrl = readl(timer0_va_base + TIMER_CTRL);
677
678 writel(evt, timer0_va_base + TIMER_LOAD);
679 writel(ctrl | TIMER_CTRL_ENABLE, timer0_va_base + TIMER_CTRL);
680
681 return 0;
682 }
683
684 static struct clock_event_device timer0_clockevent = {
685 .name = "timer0",
686 .shift = 32,
687 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
688 .set_mode = timer_set_mode,
689 .set_next_event = timer_set_next_event,
690 .rating = 300,
691 .cpumask = cpu_all_mask,
692 };
693
694 static void __init realview_clockevents_init(unsigned int timer_irq)
695 {
696 timer0_clockevent.irq = timer_irq;
697 timer0_clockevent.mult =
698 div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
699 timer0_clockevent.max_delta_ns =
700 clockevent_delta2ns(0xffffffff, &timer0_clockevent);
701 timer0_clockevent.min_delta_ns =
702 clockevent_delta2ns(0xf, &timer0_clockevent);
703
704 clockevents_register_device(&timer0_clockevent);
705 }
706
707 /*
708 * IRQ handler for the timer
709 */
710 static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
711 {
712 struct clock_event_device *evt = &timer0_clockevent;
713
714 /* clear the interrupt */
715 writel(1, timer0_va_base + TIMER_INTCLR);
716
717 evt->event_handler(evt);
718
719 return IRQ_HANDLED;
720 }
721
722 static struct irqaction realview_timer_irq = {
723 .name = "RealView Timer Tick",
724 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
725 .handler = realview_timer_interrupt,
726 };
727
728 static cycle_t realview_get_cycles(struct clocksource *cs)
729 {
730 return ~readl(timer3_va_base + TIMER_VALUE);
731 }
732
733 static struct clocksource clocksource_realview = {
734 .name = "timer3",
735 .rating = 200,
736 .read = realview_get_cycles,
737 .mask = CLOCKSOURCE_MASK(32),
738 .shift = 20,
739 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
740 };
741
742 static void __init realview_clocksource_init(void)
743 {
744 /* setup timer 0 as free-running clocksource */
745 writel(0, timer3_va_base + TIMER_CTRL);
746 writel(0xffffffff, timer3_va_base + TIMER_LOAD);
747 writel(0xffffffff, timer3_va_base + TIMER_VALUE);
748 writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
749 timer3_va_base + TIMER_CTRL);
750
751 clocksource_realview.mult =
752 clocksource_khz2mult(1000, clocksource_realview.shift);
753 clocksource_register(&clocksource_realview);
754 }
755
756 /*
757 * Set up the clock source and clock events devices
758 */
759 void __init realview_timer_init(unsigned int timer_irq)
760 {
761 u32 val;
762
763 /*
764 * set clock frequency:
765 * REALVIEW_REFCLK is 32KHz
766 * REALVIEW_TIMCLK is 1MHz
767 */
768 val = readl(__io_address(REALVIEW_SCTL_BASE));
769 writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
770 (REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) |
771 (REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
772 (REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
773 __io_address(REALVIEW_SCTL_BASE));
774
775 /*
776 * Initialise to a known state (all timers off)
777 */
778 writel(0, timer0_va_base + TIMER_CTRL);
779 writel(0, timer1_va_base + TIMER_CTRL);
780 writel(0, timer2_va_base + TIMER_CTRL);
781 writel(0, timer3_va_base + TIMER_CTRL);
782
783 /*
784 * Make irqs happen for the system timer
785 */
786 setup_irq(timer_irq, &realview_timer_irq);
787
788 realview_clocksource_init();
789 realview_clockevents_init(timer_irq);
790 }
Linux for Ginger Game Console