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>
37 * This table is setup for a 3.6864MHz Crystal.
39 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
58 #if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
60 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
66 for (i = 0; i < NR_FREQS; i++)
67 if (cclk_frequency_100khz[i] >= khz)
73 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
75 unsigned int freq = 0;
77 freq = cclk_frequency_100khz[idx] * 100;
82 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
83 * this platform, anyway.
85 int sa11x0_verify_speed(struct cpufreq_policy *policy)
91 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
93 /* make sure that at least one frequency is within the policy */
94 tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
95 if (tmp > policy->max)
98 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
103 unsigned int sa11x0_getspeed(unsigned int cpu)
107 return cclk_frequency_100khz[PPCR & 0xf] * 100;
112 * We still need to provide this so building without cpufreq works.
114 unsigned int cpufreq_get(unsigned int cpu)
116 return cclk_frequency_100khz[PPCR & 0xf] * 100;
118 EXPORT_SYMBOL(cpufreq_get);
122 * This is the SA11x0 sched_clock implementation. This has
123 * a resolution of 271ns, and a maximum value of 32025597s (370 days).
125 * The return value is guaranteed to be monotonic in that range as
126 * long as there is always less than 582 seconds between successive
127 * calls to this function.
129 * ( * 1E9 / 3686400 => * 78125 / 288)
131 unsigned long long sched_clock(void)
133 unsigned long long v = cnt32_to_63(OSCR);
135 /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
142 int gpio_direction_input(unsigned gpio)
149 local_irq_save(flags);
150 GPDR &= ~GPIO_GPIO(gpio);
151 local_irq_restore(flags);
155 EXPORT_SYMBOL(gpio_direction_input);
157 int gpio_direction_output(unsigned gpio, int value)
164 local_irq_save(flags);
165 gpio_set_value(gpio, value);
166 GPDR |= GPIO_GPIO(gpio);
167 local_irq_restore(flags);
171 EXPORT_SYMBOL(gpio_direction_output);
174 * Default power-off for SA1100
176 static void sa1100_power_off(void)
180 /* disable internal oscillator, float CS lines */
181 PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
182 /* enable wake-up on GPIO0 (Assabet...) */
183 PWER = GFER = GRER = 1;
185 * set scratchpad to zero, just in case it is used as a
186 * restart address by the bootloader.
189 /* enter sleep mode */
193 static struct resource sa11x0udc_resources[] = {
197 .flags = IORESOURCE_MEM,
201 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
203 static struct platform_device sa11x0udc_device = {
204 .name = "sa11x0-udc",
207 .dma_mask = &sa11x0udc_dma_mask,
208 .coherent_dma_mask = 0xffffffff,
210 .num_resources = ARRAY_SIZE(sa11x0udc_resources),
211 .resource = sa11x0udc_resources,
214 static struct resource sa11x0uart1_resources[] = {
218 .flags = IORESOURCE_MEM,
222 static struct platform_device sa11x0uart1_device = {
223 .name = "sa11x0-uart",
225 .num_resources = ARRAY_SIZE(sa11x0uart1_resources),
226 .resource = sa11x0uart1_resources,
229 static struct resource sa11x0uart3_resources[] = {
233 .flags = IORESOURCE_MEM,
237 static struct platform_device sa11x0uart3_device = {
238 .name = "sa11x0-uart",
240 .num_resources = ARRAY_SIZE(sa11x0uart3_resources),
241 .resource = sa11x0uart3_resources,
244 static struct resource sa11x0mcp_resources[] = {
248 .flags = IORESOURCE_MEM,
252 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
254 static struct platform_device sa11x0mcp_device = {
255 .name = "sa11x0-mcp",
258 .dma_mask = &sa11x0mcp_dma_mask,
259 .coherent_dma_mask = 0xffffffff,
261 .num_resources = ARRAY_SIZE(sa11x0mcp_resources),
262 .resource = sa11x0mcp_resources,
265 void sa11x0_set_mcp_data(struct mcp_plat_data *data)
267 sa11x0mcp_device.dev.platform_data = data;
270 static struct resource sa11x0ssp_resources[] = {
274 .flags = IORESOURCE_MEM,
278 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
280 static struct platform_device sa11x0ssp_device = {
281 .name = "sa11x0-ssp",
284 .dma_mask = &sa11x0ssp_dma_mask,
285 .coherent_dma_mask = 0xffffffff,
287 .num_resources = ARRAY_SIZE(sa11x0ssp_resources),
288 .resource = sa11x0ssp_resources,
291 static struct resource sa11x0fb_resources[] = {
295 .flags = IORESOURCE_MEM,
300 .flags = IORESOURCE_IRQ,
304 static struct platform_device sa11x0fb_device = {
308 .coherent_dma_mask = 0xffffffff,
310 .num_resources = ARRAY_SIZE(sa11x0fb_resources),
311 .resource = sa11x0fb_resources,
314 static struct platform_device sa11x0pcmcia_device = {
315 .name = "sa11x0-pcmcia",
319 static struct platform_device sa11x0mtd_device = {
324 void sa11x0_set_flash_data(struct flash_platform_data *flash,
325 struct resource *res, int nr)
327 flash->name = "sa1100";
328 sa11x0mtd_device.dev.platform_data = flash;
329 sa11x0mtd_device.resource = res;
330 sa11x0mtd_device.num_resources = nr;
333 static struct resource sa11x0ir_resources[] = {
335 .start = __PREG(Ser2UTCR0),
336 .end = __PREG(Ser2UTCR0) + 0x24 - 1,
337 .flags = IORESOURCE_MEM,
339 .start = __PREG(Ser2HSCR0),
340 .end = __PREG(Ser2HSCR0) + 0x1c - 1,
341 .flags = IORESOURCE_MEM,
343 .start = __PREG(Ser2HSCR2),
344 .end = __PREG(Ser2HSCR2) + 0x04 - 1,
345 .flags = IORESOURCE_MEM,
347 .start = IRQ_Ser2ICP,
349 .flags = IORESOURCE_IRQ,
353 static struct platform_device sa11x0ir_device = {
356 .num_resources = ARRAY_SIZE(sa11x0ir_resources),
357 .resource = sa11x0ir_resources,
360 void sa11x0_set_irda_data(struct irda_platform_data *irda)
362 sa11x0ir_device.dev.platform_data = irda;
365 static struct platform_device sa11x0rtc_device = {
366 .name = "sa1100-rtc",
370 static struct platform_device *sa11x0_devices[] __initdata = {
376 &sa11x0pcmcia_device,
382 static int __init sa1100_init(void)
384 pm_power_off = sa1100_power_off;
386 if (sa11x0ir_device.dev.platform_data)
387 platform_device_register(&sa11x0ir_device);
389 return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
392 arch_initcall(sa1100_init);
394 void (*sa1100fb_backlight_power)(int on);
395 void (*sa1100fb_lcd_power)(int on);
397 EXPORT_SYMBOL(sa1100fb_backlight_power);
398 EXPORT_SYMBOL(sa1100fb_lcd_power);
402 * Common I/O mapping:
404 * Typically, static virtual address mappings are as follow:
406 * 0xf0000000-0xf3ffffff: miscellaneous stuff (CPLDs, etc.)
407 * 0xf4000000-0xf4ffffff: SA-1111
408 * 0xf5000000-0xf5ffffff: reserved (used by cache flushing area)
409 * 0xf6000000-0xfffeffff: reserved (internal SA1100 IO defined above)
410 * 0xffff0000-0xffff0fff: SA1100 exception vectors
411 * 0xffff2000-0xffff2fff: Minicache copy_user_page area
413 * Below 0xe8000000 is reserved for vm allocation.
415 * The machine specific code must provide the extra mapping beside the
416 * default mapping provided here.
419 static struct map_desc standard_io_desc[] __initdata = {
421 .virtual = 0xf8000000,
422 .pfn = __phys_to_pfn(0x80000000),
423 .length = 0x00100000,
426 .virtual = 0xfa000000,
427 .pfn = __phys_to_pfn(0x90000000),
428 .length = 0x00100000,
431 .virtual = 0xfc000000,
432 .pfn = __phys_to_pfn(0xa0000000),
433 .length = 0x00100000,
436 .virtual = 0xfe000000,
437 .pfn = __phys_to_pfn(0xb0000000),
438 .length = 0x00200000,
443 void __init sa1100_map_io(void)
445 iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
449 * Disable the memory bus request/grant signals on the SA1110 to
450 * ensure that we don't receive spurious memory requests. We set
451 * the MBGNT signal false to ensure the SA1111 doesn't own the
454 void __init sa1110_mb_disable(void)
458 local_irq_save(flags);
462 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
464 GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
466 local_irq_restore(flags);
470 * If the system is going to use the SA-1111 DMA engines, set up
471 * the memory bus request/grant pins.
473 void __init sa1110_mb_enable(void)
477 local_irq_save(flags);
481 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
483 GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
486 local_irq_restore(flags);