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>
22 #include <asm/div64.h>
23 #include <asm/cnt32_to_63.h>
24 #include <asm/hardware.h>
25 #include <asm/system.h>
26 #include <asm/pgtable.h>
27 #include <asm/mach/map.h>
28 #include <asm/mach/flash.h>
36 * This table is setup for a 3.6864MHz Crystal.
38 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
57 #if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
59 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
65 for (i = 0; i < NR_FREQS; i++)
66 if (cclk_frequency_100khz[i] >= khz)
72 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
74 unsigned int freq = 0;
76 freq = cclk_frequency_100khz[idx] * 100;
81 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
82 * this platform, anyway.
84 int sa11x0_verify_speed(struct cpufreq_policy *policy)
90 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
92 /* make sure that at least one frequency is within the policy */
93 tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
94 if (tmp > policy->max)
97 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
102 unsigned int sa11x0_getspeed(unsigned int cpu)
106 return cclk_frequency_100khz[PPCR & 0xf] * 100;
111 * We still need to provide this so building without cpufreq works.
113 unsigned int cpufreq_get(unsigned int cpu)
115 return cclk_frequency_100khz[PPCR & 0xf] * 100;
117 EXPORT_SYMBOL(cpufreq_get);
121 * This is the SA11x0 sched_clock implementation. This has
122 * a resolution of 271ns, and a maximum value of 32025597s (370 days).
124 * The return value is guaranteed to be monotonic in that range as
125 * long as there is always less than 582 seconds between successive
126 * calls to this function.
128 * ( * 1E9 / 3686400 => * 78125 / 288)
130 unsigned long long sched_clock(void)
132 unsigned long long v = cnt32_to_63(OSCR);
134 /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
141 int gpio_direction_input(unsigned gpio)
148 local_irq_save(flags);
149 GPDR &= ~GPIO_GPIO(gpio);
150 local_irq_restore(flags);
154 EXPORT_SYMBOL(gpio_direction_input);
156 int gpio_direction_output(unsigned gpio, int value)
163 local_irq_save(flags);
164 gpio_set_value(gpio, value);
165 GPDR |= GPIO_GPIO(gpio);
166 local_irq_restore(flags);
170 EXPORT_SYMBOL(gpio_direction_output);
173 * Default power-off for SA1100
175 static void sa1100_power_off(void)
179 /* disable internal oscillator, float CS lines */
180 PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
181 /* enable wake-up on GPIO0 (Assabet...) */
182 PWER = GFER = GRER = 1;
184 * set scratchpad to zero, just in case it is used as a
185 * restart address by the bootloader.
188 /* enter sleep mode */
192 static struct resource sa11x0udc_resources[] = {
196 .flags = IORESOURCE_MEM,
200 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
202 static struct platform_device sa11x0udc_device = {
203 .name = "sa11x0-udc",
206 .dma_mask = &sa11x0udc_dma_mask,
207 .coherent_dma_mask = 0xffffffff,
209 .num_resources = ARRAY_SIZE(sa11x0udc_resources),
210 .resource = sa11x0udc_resources,
213 static struct resource sa11x0uart1_resources[] = {
217 .flags = IORESOURCE_MEM,
221 static struct platform_device sa11x0uart1_device = {
222 .name = "sa11x0-uart",
224 .num_resources = ARRAY_SIZE(sa11x0uart1_resources),
225 .resource = sa11x0uart1_resources,
228 static struct resource sa11x0uart3_resources[] = {
232 .flags = IORESOURCE_MEM,
236 static struct platform_device sa11x0uart3_device = {
237 .name = "sa11x0-uart",
239 .num_resources = ARRAY_SIZE(sa11x0uart3_resources),
240 .resource = sa11x0uart3_resources,
243 static struct resource sa11x0mcp_resources[] = {
247 .flags = IORESOURCE_MEM,
251 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
253 static struct platform_device sa11x0mcp_device = {
254 .name = "sa11x0-mcp",
257 .dma_mask = &sa11x0mcp_dma_mask,
258 .coherent_dma_mask = 0xffffffff,
260 .num_resources = ARRAY_SIZE(sa11x0mcp_resources),
261 .resource = sa11x0mcp_resources,
264 void sa11x0_set_mcp_data(struct mcp_plat_data *data)
266 sa11x0mcp_device.dev.platform_data = data;
269 static struct resource sa11x0ssp_resources[] = {
273 .flags = IORESOURCE_MEM,
277 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
279 static struct platform_device sa11x0ssp_device = {
280 .name = "sa11x0-ssp",
283 .dma_mask = &sa11x0ssp_dma_mask,
284 .coherent_dma_mask = 0xffffffff,
286 .num_resources = ARRAY_SIZE(sa11x0ssp_resources),
287 .resource = sa11x0ssp_resources,
290 static struct resource sa11x0fb_resources[] = {
294 .flags = IORESOURCE_MEM,
299 .flags = IORESOURCE_IRQ,
303 static struct platform_device sa11x0fb_device = {
307 .coherent_dma_mask = 0xffffffff,
309 .num_resources = ARRAY_SIZE(sa11x0fb_resources),
310 .resource = sa11x0fb_resources,
313 static struct platform_device sa11x0pcmcia_device = {
314 .name = "sa11x0-pcmcia",
318 static struct platform_device sa11x0mtd_device = {
323 void sa11x0_set_flash_data(struct flash_platform_data *flash,
324 struct resource *res, int nr)
326 flash->name = "sa1100";
327 sa11x0mtd_device.dev.platform_data = flash;
328 sa11x0mtd_device.resource = res;
329 sa11x0mtd_device.num_resources = nr;
332 static struct resource sa11x0ir_resources[] = {
334 .start = __PREG(Ser2UTCR0),
335 .end = __PREG(Ser2UTCR0) + 0x24 - 1,
336 .flags = IORESOURCE_MEM,
338 .start = __PREG(Ser2HSCR0),
339 .end = __PREG(Ser2HSCR0) + 0x1c - 1,
340 .flags = IORESOURCE_MEM,
342 .start = __PREG(Ser2HSCR2),
343 .end = __PREG(Ser2HSCR2) + 0x04 - 1,
344 .flags = IORESOURCE_MEM,
346 .start = IRQ_Ser2ICP,
348 .flags = IORESOURCE_IRQ,
352 static struct platform_device sa11x0ir_device = {
355 .num_resources = ARRAY_SIZE(sa11x0ir_resources),
356 .resource = sa11x0ir_resources,
359 void sa11x0_set_irda_data(struct irda_platform_data *irda)
361 sa11x0ir_device.dev.platform_data = irda;
364 static struct platform_device sa11x0rtc_device = {
365 .name = "sa1100-rtc",
369 static struct platform_device *sa11x0_devices[] __initdata = {
375 &sa11x0pcmcia_device,
381 static int __init sa1100_init(void)
383 pm_power_off = sa1100_power_off;
385 if (sa11x0ir_device.dev.platform_data)
386 platform_device_register(&sa11x0ir_device);
388 return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
391 arch_initcall(sa1100_init);
393 void (*sa1100fb_backlight_power)(int on);
394 void (*sa1100fb_lcd_power)(int on);
396 EXPORT_SYMBOL(sa1100fb_backlight_power);
397 EXPORT_SYMBOL(sa1100fb_lcd_power);
401 * Common I/O mapping:
403 * Typically, static virtual address mappings are as follow:
405 * 0xf0000000-0xf3ffffff: miscellaneous stuff (CPLDs, etc.)
406 * 0xf4000000-0xf4ffffff: SA-1111
407 * 0xf5000000-0xf5ffffff: reserved (used by cache flushing area)
408 * 0xf6000000-0xfffeffff: reserved (internal SA1100 IO defined above)
409 * 0xffff0000-0xffff0fff: SA1100 exception vectors
410 * 0xffff2000-0xffff2fff: Minicache copy_user_page area
412 * Below 0xe8000000 is reserved for vm allocation.
414 * The machine specific code must provide the extra mapping beside the
415 * default mapping provided here.
418 static struct map_desc standard_io_desc[] __initdata = {
420 .virtual = 0xf8000000,
421 .pfn = __phys_to_pfn(0x80000000),
422 .length = 0x00100000,
425 .virtual = 0xfa000000,
426 .pfn = __phys_to_pfn(0x90000000),
427 .length = 0x00100000,
430 .virtual = 0xfc000000,
431 .pfn = __phys_to_pfn(0xa0000000),
432 .length = 0x00100000,
435 .virtual = 0xfe000000,
436 .pfn = __phys_to_pfn(0xb0000000),
437 .length = 0x00200000,
442 void __init sa1100_map_io(void)
444 iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
448 * Disable the memory bus request/grant signals on the SA1110 to
449 * ensure that we don't receive spurious memory requests. We set
450 * the MBGNT signal false to ensure the SA1111 doesn't own the
453 void __init sa1110_mb_disable(void)
457 local_irq_save(flags);
461 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
463 GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
465 local_irq_restore(flags);
469 * If the system is going to use the SA-1111 DMA engines, set up
470 * the memory bus request/grant pins.
472 void __init sa1110_mb_enable(void)
476 local_irq_save(flags);
480 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
482 GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
485 local_irq_restore(flags);