RealView: Add sparsemem support for the RealView PBX platform
[linux-3.10.git] / arch / arm / mach-realview / core.c
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 #ifdef CONFIG_ZONE_DMA
63 /*
64  * Adjust the zones if there are restrictions for DMA access.
65  */
66 void __init realview_adjust_zones(int node, unsigned long *size,
67                                   unsigned long *hole)
68 {
69         unsigned long dma_size = SZ_256M >> PAGE_SHIFT;
70
71         if (!machine_is_realview_pbx() || node || (size[0] <= dma_size))
72                 return;
73
74         size[ZONE_NORMAL] = size[0] - dma_size;
75         size[ZONE_DMA] = dma_size;
76         hole[ZONE_NORMAL] = hole[0];
77         hole[ZONE_DMA] = 0;
78 }
79 #endif
80
81 /*
82  * This is the RealView sched_clock implementation.  This has
83  * a resolution of 41.7ns, and a maximum value of about 179s.
84  */
85 unsigned long long sched_clock(void)
86 {
87         unsigned long long v;
88
89         v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
90         do_div(v, 3);
91
92         return v;
93 }
94
95
96 #define REALVIEW_FLASHCTRL    (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
97
98 static int realview_flash_init(void)
99 {
100         u32 val;
101
102         val = __raw_readl(REALVIEW_FLASHCTRL);
103         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
104         __raw_writel(val, REALVIEW_FLASHCTRL);
105
106         return 0;
107 }
108
109 static void realview_flash_exit(void)
110 {
111         u32 val;
112
113         val = __raw_readl(REALVIEW_FLASHCTRL);
114         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
115         __raw_writel(val, REALVIEW_FLASHCTRL);
116 }
117
118 static void realview_flash_set_vpp(int on)
119 {
120         u32 val;
121
122         val = __raw_readl(REALVIEW_FLASHCTRL);
123         if (on)
124                 val |= REALVIEW_FLASHPROG_FLVPPEN;
125         else
126                 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
127         __raw_writel(val, REALVIEW_FLASHCTRL);
128 }
129
130 static struct flash_platform_data realview_flash_data = {
131         .map_name               = "cfi_probe",
132         .width                  = 4,
133         .init                   = realview_flash_init,
134         .exit                   = realview_flash_exit,
135         .set_vpp                = realview_flash_set_vpp,
136 };
137
138 struct platform_device realview_flash_device = {
139         .name                   = "armflash",
140         .id                     = 0,
141         .dev                    = {
142                 .platform_data  = &realview_flash_data,
143         },
144 };
145
146 int realview_flash_register(struct resource *res, u32 num)
147 {
148         realview_flash_device.resource = res;
149         realview_flash_device.num_resources = num;
150         return platform_device_register(&realview_flash_device);
151 }
152
153 static struct smsc911x_platform_config smsc911x_config = {
154         .flags          = SMSC911X_USE_32BIT,
155         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH,
156         .irq_type       = SMSC911X_IRQ_TYPE_PUSH_PULL,
157         .phy_interface  = PHY_INTERFACE_MODE_MII,
158 };
159
160 static struct platform_device realview_eth_device = {
161         .name           = "smsc911x",
162         .id             = 0,
163         .num_resources  = 2,
164 };
165
166 int realview_eth_register(const char *name, struct resource *res)
167 {
168         if (name)
169                 realview_eth_device.name = name;
170         realview_eth_device.resource = res;
171         if (strcmp(realview_eth_device.name, "smsc911x") == 0)
172                 realview_eth_device.dev.platform_data = &smsc911x_config;
173
174         return platform_device_register(&realview_eth_device);
175 }
176
177 struct platform_device realview_usb_device = {
178         .name                   = "isp1760",
179         .num_resources          = 2,
180 };
181
182 int realview_usb_register(struct resource *res)
183 {
184         realview_usb_device.resource = res;
185         return platform_device_register(&realview_usb_device);
186 }
187
188 static struct pata_platform_info pata_platform_data = {
189         .ioport_shift           = 1,
190 };
191
192 static struct resource pata_resources[] = {
193         [0] = {
194                 .start          = REALVIEW_CF_BASE,
195                 .end            = REALVIEW_CF_BASE + 0xff,
196                 .flags          = IORESOURCE_MEM,
197         },
198         [1] = {
199                 .start          = REALVIEW_CF_BASE + 0x100,
200                 .end            = REALVIEW_CF_BASE + SZ_4K - 1,
201                 .flags          = IORESOURCE_MEM,
202         },
203 };
204
205 struct platform_device realview_cf_device = {
206         .name                   = "pata_platform",
207         .id                     = -1,
208         .num_resources          = ARRAY_SIZE(pata_resources),
209         .resource               = pata_resources,
210         .dev                    = {
211                 .platform_data  = &pata_platform_data,
212         },
213 };
214
215 static struct resource realview_i2c_resource = {
216         .start          = REALVIEW_I2C_BASE,
217         .end            = REALVIEW_I2C_BASE + SZ_4K - 1,
218         .flags          = IORESOURCE_MEM,
219 };
220
221 struct platform_device realview_i2c_device = {
222         .name           = "versatile-i2c",
223         .id             = 0,
224         .num_resources  = 1,
225         .resource       = &realview_i2c_resource,
226 };
227
228 static struct i2c_board_info realview_i2c_board_info[] = {
229         {
230                 I2C_BOARD_INFO("ds1338", 0xd0 >> 1),
231         },
232 };
233
234 static int __init realview_i2c_init(void)
235 {
236         return i2c_register_board_info(0, realview_i2c_board_info,
237                                        ARRAY_SIZE(realview_i2c_board_info));
238 }
239 arch_initcall(realview_i2c_init);
240
241 #define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
242
243 /*
244  * This is only used if GPIOLIB support is disabled
245  */
246 static unsigned int realview_mmc_status(struct device *dev)
247 {
248         struct amba_device *adev = container_of(dev, struct amba_device, dev);
249         u32 mask;
250
251         if (adev->res.start == REALVIEW_MMCI0_BASE)
252                 mask = 1;
253         else
254                 mask = 2;
255
256         return readl(REALVIEW_SYSMCI) & mask;
257 }
258
259 struct mmci_platform_data realview_mmc0_plat_data = {
260         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
261         .status         = realview_mmc_status,
262         .gpio_wp        = 17,
263         .gpio_cd        = 16,
264 };
265
266 struct mmci_platform_data realview_mmc1_plat_data = {
267         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
268         .status         = realview_mmc_status,
269         .gpio_wp        = 19,
270         .gpio_cd        = 18,
271 };
272
273 /*
274  * Clock handling
275  */
276 static const struct icst307_params realview_oscvco_params = {
277         .ref            = 24000,
278         .vco_max        = 200000,
279         .vd_min         = 4 + 8,
280         .vd_max         = 511 + 8,
281         .rd_min         = 1 + 2,
282         .rd_max         = 127 + 2,
283 };
284
285 static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
286 {
287         void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
288         void __iomem *sys_osc;
289         u32 val;
290
291         if (machine_is_realview_pb1176())
292                 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC0_OFFSET;
293         else
294                 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
295
296         val = readl(sys_osc) & ~0x7ffff;
297         val |= vco.v | (vco.r << 9) | (vco.s << 16);
298
299         writel(0xa05f, sys_lock);
300         writel(val, sys_osc);
301         writel(0, sys_lock);
302 }
303
304 static struct clk oscvco_clk = {
305         .params = &realview_oscvco_params,
306         .setvco = realview_oscvco_set,
307 };
308
309 /*
310  * These are fixed clocks.
311  */
312 static struct clk ref24_clk = {
313         .rate   = 24000000,
314 };
315
316 static struct clk_lookup lookups[] = {
317         {       /* UART0 */
318                 .dev_id         = "dev:uart0",
319                 .clk            = &ref24_clk,
320         }, {    /* UART1 */
321                 .dev_id         = "dev:uart1",
322                 .clk            = &ref24_clk,
323         }, {    /* UART2 */
324                 .dev_id         = "dev:uart2",
325                 .clk            = &ref24_clk,
326         }, {    /* UART3 */
327                 .dev_id         = "fpga:uart3",
328                 .clk            = &ref24_clk,
329         }, {    /* KMI0 */
330                 .dev_id         = "fpga:kmi0",
331                 .clk            = &ref24_clk,
332         }, {    /* KMI1 */
333                 .dev_id         = "fpga:kmi1",
334                 .clk            = &ref24_clk,
335         }, {    /* MMC0 */
336                 .dev_id         = "fpga:mmc0",
337                 .clk            = &ref24_clk,
338         }, {    /* EB:CLCD */
339                 .dev_id         = "dev:clcd",
340                 .clk            = &oscvco_clk,
341         }, {    /* PB:CLCD */
342                 .dev_id         = "issp:clcd",
343                 .clk            = &oscvco_clk,
344         }
345 };
346
347 static int __init clk_init(void)
348 {
349         int i;
350
351         for (i = 0; i < ARRAY_SIZE(lookups); i++)
352                 clkdev_add(&lookups[i]);
353         return 0;
354 }
355 arch_initcall(clk_init);
356
357 /*
358  * CLCD support.
359  */
360 #define SYS_CLCD_NLCDIOON       (1 << 2)
361 #define SYS_CLCD_VDDPOSSWITCH   (1 << 3)
362 #define SYS_CLCD_PWR3V5SWITCH   (1 << 4)
363 #define SYS_CLCD_ID_MASK        (0x1f << 8)
364 #define SYS_CLCD_ID_SANYO_3_8   (0x00 << 8)
365 #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
366 #define SYS_CLCD_ID_EPSON_2_2   (0x02 << 8)
367 #define SYS_CLCD_ID_SANYO_2_5   (0x07 << 8)
368 #define SYS_CLCD_ID_VGA         (0x1f << 8)
369
370 static struct clcd_panel vga = {
371         .mode           = {
372                 .name           = "VGA",
373                 .refresh        = 60,
374                 .xres           = 640,
375                 .yres           = 480,
376                 .pixclock       = 39721,
377                 .left_margin    = 40,
378                 .right_margin   = 24,
379                 .upper_margin   = 32,
380                 .lower_margin   = 11,
381                 .hsync_len      = 96,
382                 .vsync_len      = 2,
383                 .sync           = 0,
384                 .vmode          = FB_VMODE_NONINTERLACED,
385         },
386         .width          = -1,
387         .height         = -1,
388         .tim2           = TIM2_BCD | TIM2_IPC,
389         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
390         .bpp            = 16,
391 };
392
393 static struct clcd_panel xvga = {
394         .mode           = {
395                 .name           = "XVGA",
396                 .refresh        = 60,
397                 .xres           = 1024,
398                 .yres           = 768,
399                 .pixclock       = 15748,
400                 .left_margin    = 152,
401                 .right_margin   = 48,
402                 .upper_margin   = 23,
403                 .lower_margin   = 3,
404                 .hsync_len      = 104,
405                 .vsync_len      = 4,
406                 .sync           = 0,
407                 .vmode          = FB_VMODE_NONINTERLACED,
408         },
409         .width          = -1,
410         .height         = -1,
411         .tim2           = TIM2_BCD | TIM2_IPC,
412         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
413         .bpp            = 16,
414 };
415
416 static struct clcd_panel sanyo_3_8_in = {
417         .mode           = {
418                 .name           = "Sanyo QVGA",
419                 .refresh        = 116,
420                 .xres           = 320,
421                 .yres           = 240,
422                 .pixclock       = 100000,
423                 .left_margin    = 6,
424                 .right_margin   = 6,
425                 .upper_margin   = 5,
426                 .lower_margin   = 5,
427                 .hsync_len      = 6,
428                 .vsync_len      = 6,
429                 .sync           = 0,
430                 .vmode          = FB_VMODE_NONINTERLACED,
431         },
432         .width          = -1,
433         .height         = -1,
434         .tim2           = TIM2_BCD,
435         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
436         .bpp            = 16,
437 };
438
439 static struct clcd_panel sanyo_2_5_in = {
440         .mode           = {
441                 .name           = "Sanyo QVGA Portrait",
442                 .refresh        = 116,
443                 .xres           = 240,
444                 .yres           = 320,
445                 .pixclock       = 100000,
446                 .left_margin    = 20,
447                 .right_margin   = 10,
448                 .upper_margin   = 2,
449                 .lower_margin   = 2,
450                 .hsync_len      = 10,
451                 .vsync_len      = 2,
452                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
453                 .vmode          = FB_VMODE_NONINTERLACED,
454         },
455         .width          = -1,
456         .height         = -1,
457         .tim2           = TIM2_IVS | TIM2_IHS | TIM2_IPC,
458         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
459         .bpp            = 16,
460 };
461
462 static struct clcd_panel epson_2_2_in = {
463         .mode           = {
464                 .name           = "Epson QCIF",
465                 .refresh        = 390,
466                 .xres           = 176,
467                 .yres           = 220,
468                 .pixclock       = 62500,
469                 .left_margin    = 3,
470                 .right_margin   = 2,
471                 .upper_margin   = 1,
472                 .lower_margin   = 0,
473                 .hsync_len      = 3,
474                 .vsync_len      = 2,
475                 .sync           = 0,
476                 .vmode          = FB_VMODE_NONINTERLACED,
477         },
478         .width          = -1,
479         .height         = -1,
480         .tim2           = TIM2_BCD | TIM2_IPC,
481         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
482         .bpp            = 16,
483 };
484
485 /*
486  * Detect which LCD panel is connected, and return the appropriate
487  * clcd_panel structure.  Note: we do not have any information on
488  * the required timings for the 8.4in panel, so we presently assume
489  * VGA timings.
490  */
491 static struct clcd_panel *realview_clcd_panel(void)
492 {
493         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
494         struct clcd_panel *vga_panel;
495         struct clcd_panel *panel;
496         u32 val;
497
498         if (machine_is_realview_eb())
499                 vga_panel = &vga;
500         else
501                 vga_panel = &xvga;
502
503         val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
504         if (val == SYS_CLCD_ID_SANYO_3_8)
505                 panel = &sanyo_3_8_in;
506         else if (val == SYS_CLCD_ID_SANYO_2_5)
507                 panel = &sanyo_2_5_in;
508         else if (val == SYS_CLCD_ID_EPSON_2_2)
509                 panel = &epson_2_2_in;
510         else if (val == SYS_CLCD_ID_VGA)
511                 panel = vga_panel;
512         else {
513                 printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
514                         val);
515                 panel = vga_panel;
516         }
517
518         return panel;
519 }
520
521 /*
522  * Disable all display connectors on the interface module.
523  */
524 static void realview_clcd_disable(struct clcd_fb *fb)
525 {
526         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
527         u32 val;
528
529         val = readl(sys_clcd);
530         val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
531         writel(val, sys_clcd);
532 }
533
534 /*
535  * Enable the relevant connector on the interface module.
536  */
537 static void realview_clcd_enable(struct clcd_fb *fb)
538 {
539         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
540         u32 val;
541
542         /*
543          * Enable the PSUs
544          */
545         val = readl(sys_clcd);
546         val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
547         writel(val, sys_clcd);
548 }
549
550 static int realview_clcd_setup(struct clcd_fb *fb)
551 {
552         unsigned long framesize;
553         dma_addr_t dma;
554
555         if (machine_is_realview_eb())
556                 /* VGA, 16bpp */
557                 framesize = 640 * 480 * 2;
558         else
559                 /* XVGA, 16bpp */
560                 framesize = 1024 * 768 * 2;
561
562         fb->panel               = realview_clcd_panel();
563
564         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
565                                                     &dma, GFP_KERNEL | GFP_DMA);
566         if (!fb->fb.screen_base) {
567                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
568                 return -ENOMEM;
569         }
570
571         fb->fb.fix.smem_start   = dma;
572         fb->fb.fix.smem_len     = framesize;
573
574         return 0;
575 }
576
577 static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
578 {
579         return dma_mmap_writecombine(&fb->dev->dev, vma,
580                                      fb->fb.screen_base,
581                                      fb->fb.fix.smem_start,
582                                      fb->fb.fix.smem_len);
583 }
584
585 static void realview_clcd_remove(struct clcd_fb *fb)
586 {
587         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
588                               fb->fb.screen_base, fb->fb.fix.smem_start);
589 }
590
591 struct clcd_board clcd_plat_data = {
592         .name           = "RealView",
593         .check          = clcdfb_check,
594         .decode         = clcdfb_decode,
595         .disable        = realview_clcd_disable,
596         .enable         = realview_clcd_enable,
597         .setup          = realview_clcd_setup,
598         .mmap           = realview_clcd_mmap,
599         .remove         = realview_clcd_remove,
600 };
601
602 #ifdef CONFIG_LEDS
603 #define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
604
605 void realview_leds_event(led_event_t ledevt)
606 {
607         unsigned long flags;
608         u32 val;
609         u32 led = 1 << smp_processor_id();
610
611         local_irq_save(flags);
612         val = readl(VA_LEDS_BASE);
613
614         switch (ledevt) {
615         case led_idle_start:
616                 val = val & ~led;
617                 break;
618
619         case led_idle_end:
620                 val = val | led;
621                 break;
622
623         case led_timer:
624                 val = val ^ REALVIEW_SYS_LED7;
625                 break;
626
627         case led_halted:
628                 val = 0;
629                 break;
630
631         default:
632                 break;
633         }
634
635         writel(val, VA_LEDS_BASE);
636         local_irq_restore(flags);
637 }
638 #endif  /* CONFIG_LEDS */
639
640 /*
641  * Where is the timer (VA)?
642  */
643 void __iomem *timer0_va_base;
644 void __iomem *timer1_va_base;
645 void __iomem *timer2_va_base;
646 void __iomem *timer3_va_base;
647
648 /*
649  * How long is the timer interval?
650  */
651 #define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_10)
652 #if TIMER_INTERVAL >= 0x100000
653 #define TIMER_RELOAD    (TIMER_INTERVAL >> 8)
654 #define TIMER_DIVISOR   (TIMER_CTRL_DIV256)
655 #define TICKS2USECS(x)  (256 * (x) / TICKS_PER_uSEC)
656 #elif TIMER_INTERVAL >= 0x10000
657 #define TIMER_RELOAD    (TIMER_INTERVAL >> 4)           /* Divide by 16 */
658 #define TIMER_DIVISOR   (TIMER_CTRL_DIV16)
659 #define TICKS2USECS(x)  (16 * (x) / TICKS_PER_uSEC)
660 #else
661 #define TIMER_RELOAD    (TIMER_INTERVAL)
662 #define TIMER_DIVISOR   (TIMER_CTRL_DIV1)
663 #define TICKS2USECS(x)  ((x) / TICKS_PER_uSEC)
664 #endif
665
666 static void timer_set_mode(enum clock_event_mode mode,
667                            struct clock_event_device *clk)
668 {
669         unsigned long ctrl;
670
671         switch(mode) {
672         case CLOCK_EVT_MODE_PERIODIC:
673                 writel(TIMER_RELOAD, timer0_va_base + TIMER_LOAD);
674
675                 ctrl = TIMER_CTRL_PERIODIC;
676                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
677                 break;
678         case CLOCK_EVT_MODE_ONESHOT:
679                 /* period set, and timer enabled in 'next_event' hook */
680                 ctrl = TIMER_CTRL_ONESHOT;
681                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
682                 break;
683         case CLOCK_EVT_MODE_UNUSED:
684         case CLOCK_EVT_MODE_SHUTDOWN:
685         default:
686                 ctrl = 0;
687         }
688
689         writel(ctrl, timer0_va_base + TIMER_CTRL);
690 }
691
692 static int timer_set_next_event(unsigned long evt,
693                                 struct clock_event_device *unused)
694 {
695         unsigned long ctrl = readl(timer0_va_base + TIMER_CTRL);
696
697         writel(evt, timer0_va_base + TIMER_LOAD);
698         writel(ctrl | TIMER_CTRL_ENABLE, timer0_va_base + TIMER_CTRL);
699
700         return 0;
701 }
702
703 static struct clock_event_device timer0_clockevent =     {
704         .name           = "timer0",
705         .shift          = 32,
706         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
707         .set_mode       = timer_set_mode,
708         .set_next_event = timer_set_next_event,
709         .rating         = 300,
710         .cpumask        = cpu_all_mask,
711 };
712
713 static void __init realview_clockevents_init(unsigned int timer_irq)
714 {
715         timer0_clockevent.irq = timer_irq;
716         timer0_clockevent.mult =
717                 div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
718         timer0_clockevent.max_delta_ns =
719                 clockevent_delta2ns(0xffffffff, &timer0_clockevent);
720         timer0_clockevent.min_delta_ns =
721                 clockevent_delta2ns(0xf, &timer0_clockevent);
722
723         clockevents_register_device(&timer0_clockevent);
724 }
725
726 /*
727  * IRQ handler for the timer
728  */
729 static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
730 {
731         struct clock_event_device *evt = &timer0_clockevent;
732
733         /* clear the interrupt */
734         writel(1, timer0_va_base + TIMER_INTCLR);
735
736         evt->event_handler(evt);
737
738         return IRQ_HANDLED;
739 }
740
741 static struct irqaction realview_timer_irq = {
742         .name           = "RealView Timer Tick",
743         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
744         .handler        = realview_timer_interrupt,
745 };
746
747 static cycle_t realview_get_cycles(struct clocksource *cs)
748 {
749         return ~readl(timer3_va_base + TIMER_VALUE);
750 }
751
752 static struct clocksource clocksource_realview = {
753         .name   = "timer3",
754         .rating = 200,
755         .read   = realview_get_cycles,
756         .mask   = CLOCKSOURCE_MASK(32),
757         .shift  = 20,
758         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
759 };
760
761 static void __init realview_clocksource_init(void)
762 {
763         /* setup timer 0 as free-running clocksource */
764         writel(0, timer3_va_base + TIMER_CTRL);
765         writel(0xffffffff, timer3_va_base + TIMER_LOAD);
766         writel(0xffffffff, timer3_va_base + TIMER_VALUE);
767         writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
768                 timer3_va_base + TIMER_CTRL);
769
770         clocksource_realview.mult =
771                 clocksource_khz2mult(1000, clocksource_realview.shift);
772         clocksource_register(&clocksource_realview);
773 }
774
775 /*
776  * Set up the clock source and clock events devices
777  */
778 void __init realview_timer_init(unsigned int timer_irq)
779 {
780         u32 val;
781
782         /* 
783          * set clock frequency: 
784          *      REALVIEW_REFCLK is 32KHz
785          *      REALVIEW_TIMCLK is 1MHz
786          */
787         val = readl(__io_address(REALVIEW_SCTL_BASE));
788         writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
789                (REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) | 
790                (REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
791                (REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
792                __io_address(REALVIEW_SCTL_BASE));
793
794         /*
795          * Initialise to a known state (all timers off)
796          */
797         writel(0, timer0_va_base + TIMER_CTRL);
798         writel(0, timer1_va_base + TIMER_CTRL);
799         writel(0, timer2_va_base + TIMER_CTRL);
800         writel(0, timer3_va_base + TIMER_CTRL);
801
802         /* 
803          * Make irqs happen for the system timer
804          */
805         setup_irq(timer_irq, &realview_timer_irq);
806
807         realview_clocksource_init();
808         realview_clockevents_init(timer_irq);
809 }
810
811 /*
812  * Setup the memory banks.
813  */
814 void realview_fixup(struct machine_desc *mdesc, struct tag *tags, char **from,
815                     struct meminfo *meminfo)
816 {
817         /*
818          * Most RealView platforms have 512MB contiguous RAM at 0x70000000.
819          * Half of this is mirrored at 0.
820          */
821 #ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
822         meminfo->bank[0].start = 0x70000000;
823         meminfo->bank[0].size = SZ_512M;
824         meminfo->nr_banks = 1;
825 #else
826         meminfo->bank[0].start = 0;
827         meminfo->bank[0].size = SZ_256M;
828         meminfo->nr_banks = 1;
829 #endif
830 }