2 * linux/arch/arm/mach-sa1100/generic.c
4 * Author: Nicolas Pitre
6 * Code common to all SA11x0 machines.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/delay.h>
17 #include <linux/cpufreq.h>
18 #include <linux/ioport.h>
19 #include <linux/sched.h> /* just for sched_clock() - funny that */
20 #include <linux/platform_device.h>
21 #include <linux/cnt32_to_63.h>
23 #include <asm/div64.h>
24 #include <mach/hardware.h>
25 #include <asm/system.h>
26 #include <asm/pgtable.h>
27 #include <asm/mach/map.h>
28 #include <asm/mach/flash.h>
34 unsigned int reset_status;
35 EXPORT_SYMBOL(reset_status);
40 * This table is setup for a 3.6864MHz Crystal.
42 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
61 #if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
63 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
69 for (i = 0; i < NR_FREQS; i++)
70 if (cclk_frequency_100khz[i] >= khz)
76 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
78 unsigned int freq = 0;
80 freq = cclk_frequency_100khz[idx] * 100;
85 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
86 * this platform, anyway.
88 int sa11x0_verify_speed(struct cpufreq_policy *policy)
94 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
96 /* make sure that at least one frequency is within the policy */
97 tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
98 if (tmp > policy->max)
101 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
106 unsigned int sa11x0_getspeed(unsigned int cpu)
110 return cclk_frequency_100khz[PPCR & 0xf] * 100;
115 * We still need to provide this so building without cpufreq works.
117 unsigned int cpufreq_get(unsigned int cpu)
119 return cclk_frequency_100khz[PPCR & 0xf] * 100;
121 EXPORT_SYMBOL(cpufreq_get);
125 * This is the SA11x0 sched_clock implementation. This has
126 * a resolution of 271ns, and a maximum value of 32025597s (370 days).
128 * The return value is guaranteed to be monotonic in that range as
129 * long as there is always less than 582 seconds between successive
130 * calls to this function.
132 * ( * 1E9 / 3686400 => * 78125 / 288)
134 unsigned long long sched_clock(void)
136 unsigned long long v = cnt32_to_63(OSCR);
138 /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
146 * Default power-off for SA1100
148 static void sa1100_power_off(void)
152 /* disable internal oscillator, float CS lines */
153 PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
154 /* enable wake-up on GPIO0 (Assabet...) */
155 PWER = GFER = GRER = 1;
157 * set scratchpad to zero, just in case it is used as a
158 * restart address by the bootloader.
161 /* enter sleep mode */
165 static struct resource sa11x0udc_resources[] = {
169 .flags = IORESOURCE_MEM,
173 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
175 static struct platform_device sa11x0udc_device = {
176 .name = "sa11x0-udc",
179 .dma_mask = &sa11x0udc_dma_mask,
180 .coherent_dma_mask = 0xffffffff,
182 .num_resources = ARRAY_SIZE(sa11x0udc_resources),
183 .resource = sa11x0udc_resources,
186 static struct resource sa11x0uart1_resources[] = {
190 .flags = IORESOURCE_MEM,
194 static struct platform_device sa11x0uart1_device = {
195 .name = "sa11x0-uart",
197 .num_resources = ARRAY_SIZE(sa11x0uart1_resources),
198 .resource = sa11x0uart1_resources,
201 static struct resource sa11x0uart3_resources[] = {
205 .flags = IORESOURCE_MEM,
209 static struct platform_device sa11x0uart3_device = {
210 .name = "sa11x0-uart",
212 .num_resources = ARRAY_SIZE(sa11x0uart3_resources),
213 .resource = sa11x0uart3_resources,
216 static struct resource sa11x0mcp_resources[] = {
220 .flags = IORESOURCE_MEM,
224 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
226 static struct platform_device sa11x0mcp_device = {
227 .name = "sa11x0-mcp",
230 .dma_mask = &sa11x0mcp_dma_mask,
231 .coherent_dma_mask = 0xffffffff,
233 .num_resources = ARRAY_SIZE(sa11x0mcp_resources),
234 .resource = sa11x0mcp_resources,
237 void sa11x0_set_mcp_data(struct mcp_plat_data *data)
239 sa11x0mcp_device.dev.platform_data = data;
242 static struct resource sa11x0ssp_resources[] = {
246 .flags = IORESOURCE_MEM,
250 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
252 static struct platform_device sa11x0ssp_device = {
253 .name = "sa11x0-ssp",
256 .dma_mask = &sa11x0ssp_dma_mask,
257 .coherent_dma_mask = 0xffffffff,
259 .num_resources = ARRAY_SIZE(sa11x0ssp_resources),
260 .resource = sa11x0ssp_resources,
263 static struct resource sa11x0fb_resources[] = {
267 .flags = IORESOURCE_MEM,
272 .flags = IORESOURCE_IRQ,
276 static struct platform_device sa11x0fb_device = {
280 .coherent_dma_mask = 0xffffffff,
282 .num_resources = ARRAY_SIZE(sa11x0fb_resources),
283 .resource = sa11x0fb_resources,
286 static struct platform_device sa11x0pcmcia_device = {
287 .name = "sa11x0-pcmcia",
291 static struct platform_device sa11x0mtd_device = {
292 .name = "sa1100-mtd",
296 void sa11x0_set_flash_data(struct flash_platform_data *flash,
297 struct resource *res, int nr)
299 flash->name = "sa1100";
300 sa11x0mtd_device.dev.platform_data = flash;
301 sa11x0mtd_device.resource = res;
302 sa11x0mtd_device.num_resources = nr;
305 static struct resource sa11x0ir_resources[] = {
307 .start = __PREG(Ser2UTCR0),
308 .end = __PREG(Ser2UTCR0) + 0x24 - 1,
309 .flags = IORESOURCE_MEM,
311 .start = __PREG(Ser2HSCR0),
312 .end = __PREG(Ser2HSCR0) + 0x1c - 1,
313 .flags = IORESOURCE_MEM,
315 .start = __PREG(Ser2HSCR2),
316 .end = __PREG(Ser2HSCR2) + 0x04 - 1,
317 .flags = IORESOURCE_MEM,
319 .start = IRQ_Ser2ICP,
321 .flags = IORESOURCE_IRQ,
325 static struct platform_device sa11x0ir_device = {
328 .num_resources = ARRAY_SIZE(sa11x0ir_resources),
329 .resource = sa11x0ir_resources,
332 void sa11x0_set_irda_data(struct irda_platform_data *irda)
334 sa11x0ir_device.dev.platform_data = irda;
337 static struct platform_device sa11x0rtc_device = {
338 .name = "sa1100-rtc",
342 static struct platform_device *sa11x0_devices[] __initdata = {
348 &sa11x0pcmcia_device,
354 static int __init sa1100_init(void)
356 pm_power_off = sa1100_power_off;
358 if (sa11x0ir_device.dev.platform_data)
359 platform_device_register(&sa11x0ir_device);
361 return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
364 arch_initcall(sa1100_init);
366 void (*sa1100fb_backlight_power)(int on);
367 void (*sa1100fb_lcd_power)(int on);
369 EXPORT_SYMBOL(sa1100fb_backlight_power);
370 EXPORT_SYMBOL(sa1100fb_lcd_power);
374 * Common I/O mapping:
376 * Typically, static virtual address mappings are as follow:
378 * 0xf0000000-0xf3ffffff: miscellaneous stuff (CPLDs, etc.)
379 * 0xf4000000-0xf4ffffff: SA-1111
380 * 0xf5000000-0xf5ffffff: reserved (used by cache flushing area)
381 * 0xf6000000-0xfffeffff: reserved (internal SA1100 IO defined above)
382 * 0xffff0000-0xffff0fff: SA1100 exception vectors
383 * 0xffff2000-0xffff2fff: Minicache copy_user_page area
385 * Below 0xe8000000 is reserved for vm allocation.
387 * The machine specific code must provide the extra mapping beside the
388 * default mapping provided here.
391 static struct map_desc standard_io_desc[] __initdata = {
393 .virtual = 0xf8000000,
394 .pfn = __phys_to_pfn(0x80000000),
395 .length = 0x00100000,
398 .virtual = 0xfa000000,
399 .pfn = __phys_to_pfn(0x90000000),
400 .length = 0x00100000,
403 .virtual = 0xfc000000,
404 .pfn = __phys_to_pfn(0xa0000000),
405 .length = 0x00100000,
408 .virtual = 0xfe000000,
409 .pfn = __phys_to_pfn(0xb0000000),
410 .length = 0x00200000,
415 void __init sa1100_map_io(void)
417 iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
421 * Disable the memory bus request/grant signals on the SA1110 to
422 * ensure that we don't receive spurious memory requests. We set
423 * the MBGNT signal false to ensure the SA1111 doesn't own the
426 void __init sa1110_mb_disable(void)
430 local_irq_save(flags);
434 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
436 GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
438 local_irq_restore(flags);
442 * If the system is going to use the SA-1111 DMA engines, set up
443 * the memory bus request/grant pins.
445 void __devinit sa1110_mb_enable(void)
449 local_irq_save(flags);
453 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
455 GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
458 local_irq_restore(flags);