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/config.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
18 #include <linux/cpufreq.h>
19 #include <linux/ioport.h>
21 #include <asm/div64.h>
22 #include <asm/hardware.h>
23 #include <asm/system.h>
24 #include <asm/pgtable.h>
25 #include <asm/mach/map.h>
33 * This table is setup for a 3.6864MHz Crystal.
35 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
54 #if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
56 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
62 for (i = 0; i < NR_FREQS; i++)
63 if (cclk_frequency_100khz[i] >= khz)
69 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
71 unsigned int freq = 0;
73 freq = cclk_frequency_100khz[idx] * 100;
78 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
79 * this platform, anyway.
81 int sa11x0_verify_speed(struct cpufreq_policy *policy)
87 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
89 /* make sure that at least one frequency is within the policy */
90 tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
91 if (tmp > policy->max)
94 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
99 unsigned int sa11x0_getspeed(void)
101 return cclk_frequency_100khz[PPCR & 0xf] * 100;
103 EXPORT_SYMBOL(sa11x0_getspeed);
106 * We still need to provide this so building without cpufreq works.
108 unsigned int cpufreq_get(unsigned int cpu)
110 return cclk_frequency_100khz[PPCR & 0xf] * 100;
112 EXPORT_SYMBOL(cpufreq_get);
116 * This is the SA11x0 sched_clock implementation. This has
117 * a resolution of 271ns, and a maximum value of 1165s.
118 * ( * 1E9 / 3686400 => * 78125 / 288)
120 unsigned long long sched_clock(void)
122 unsigned long long v;
124 v = (unsigned long long)OSCR * 78125;
131 * Default power-off for SA1100
133 static void sa1100_power_off(void)
137 /* disable internal oscillator, float CS lines */
138 PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
139 /* enable wake-up on GPIO0 (Assabet...) */
140 PWER = GFER = GRER = 1;
142 * set scratchpad to zero, just in case it is used as a
143 * restart address by the bootloader.
146 /* enter sleep mode */
150 static struct resource sa11x0udc_resources[] = {
154 .flags = IORESOURCE_MEM,
158 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
160 static struct platform_device sa11x0udc_device = {
161 .name = "sa11x0-udc",
164 .dma_mask = &sa11x0udc_dma_mask,
165 .coherent_dma_mask = 0xffffffff,
167 .num_resources = ARRAY_SIZE(sa11x0udc_resources),
168 .resource = sa11x0udc_resources,
171 static struct resource sa11x0uart1_resources[] = {
175 .flags = IORESOURCE_MEM,
179 static struct platform_device sa11x0uart1_device = {
180 .name = "sa11x0-uart",
182 .num_resources = ARRAY_SIZE(sa11x0uart1_resources),
183 .resource = sa11x0uart1_resources,
186 static struct resource sa11x0uart3_resources[] = {
190 .flags = IORESOURCE_MEM,
194 static struct platform_device sa11x0uart3_device = {
195 .name = "sa11x0-uart",
197 .num_resources = ARRAY_SIZE(sa11x0uart3_resources),
198 .resource = sa11x0uart3_resources,
201 static struct resource sa11x0mcp_resources[] = {
205 .flags = IORESOURCE_MEM,
209 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
211 static struct platform_device sa11x0mcp_device = {
212 .name = "sa11x0-mcp",
215 .dma_mask = &sa11x0mcp_dma_mask,
216 .coherent_dma_mask = 0xffffffff,
218 .num_resources = ARRAY_SIZE(sa11x0mcp_resources),
219 .resource = sa11x0mcp_resources,
222 static struct resource sa11x0ssp_resources[] = {
226 .flags = IORESOURCE_MEM,
230 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
232 static struct platform_device sa11x0ssp_device = {
233 .name = "sa11x0-ssp",
236 .dma_mask = &sa11x0ssp_dma_mask,
237 .coherent_dma_mask = 0xffffffff,
239 .num_resources = ARRAY_SIZE(sa11x0ssp_resources),
240 .resource = sa11x0ssp_resources,
243 static struct resource sa11x0fb_resources[] = {
247 .flags = IORESOURCE_MEM,
252 .flags = IORESOURCE_IRQ,
256 static struct platform_device sa11x0fb_device = {
260 .coherent_dma_mask = 0xffffffff,
262 .num_resources = ARRAY_SIZE(sa11x0fb_resources),
263 .resource = sa11x0fb_resources,
266 static struct platform_device sa11x0pcmcia_device = {
267 .name = "sa11x0-pcmcia",
271 static struct platform_device *sa11x0_devices[] __initdata = {
277 &sa11x0pcmcia_device,
281 static int __init sa1100_init(void)
283 pm_power_off = sa1100_power_off;
285 return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
288 arch_initcall(sa1100_init);
290 void (*sa1100fb_backlight_power)(int on);
291 void (*sa1100fb_lcd_power)(int on);
293 EXPORT_SYMBOL(sa1100fb_backlight_power);
294 EXPORT_SYMBOL(sa1100fb_lcd_power);
298 * Common I/O mapping:
300 * Typically, static virtual address mappings are as follow:
302 * 0xf0000000-0xf3ffffff: miscellaneous stuff (CPLDs, etc.)
303 * 0xf4000000-0xf4ffffff: SA-1111
304 * 0xf5000000-0xf5ffffff: reserved (used by cache flushing area)
305 * 0xf6000000-0xfffeffff: reserved (internal SA1100 IO defined above)
306 * 0xffff0000-0xffff0fff: SA1100 exception vectors
307 * 0xffff2000-0xffff2fff: Minicache copy_user_page area
309 * Below 0xe8000000 is reserved for vm allocation.
311 * The machine specific code must provide the extra mapping beside the
312 * default mapping provided here.
315 static struct map_desc standard_io_desc[] __initdata = {
316 /* virtual physical length type */
317 { 0xf8000000, 0x80000000, 0x00100000, MT_DEVICE }, /* PCM */
318 { 0xfa000000, 0x90000000, 0x00100000, MT_DEVICE }, /* SCM */
319 { 0xfc000000, 0xa0000000, 0x00100000, MT_DEVICE }, /* MER */
320 { 0xfe000000, 0xb0000000, 0x00200000, MT_DEVICE } /* LCD + DMA */
323 void __init sa1100_map_io(void)
325 iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
329 * Disable the memory bus request/grant signals on the SA1110 to
330 * ensure that we don't receive spurious memory requests. We set
331 * the MBGNT signal false to ensure the SA1111 doesn't own the
334 void __init sa1110_mb_disable(void)
338 local_irq_save(flags);
342 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
344 GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
346 local_irq_restore(flags);
350 * If the system is going to use the SA-1111 DMA engines, set up
351 * the memory bus request/grant pins.
353 void __init sa1110_mb_enable(void)
357 local_irq_save(flags);
361 GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
363 GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
366 local_irq_restore(flags);