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/*
* linux/arch/arm/mach-sa1100/generic.c
*
* Author: Nicolas Pitre
*
* Code common to all SA11x0 machines.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Since this file should be linked before any other machine specific file,
* the __initcall() here will be executed first. This serves as default
* initialization stuff for SA1100 machines which can be overriden later if
* need be.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/cpufreq.h>
#include <asm/hardware.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include "generic.h"
#define NR_FREQS 16
/*
* This table is setup for a 3.6864MHz Crystal.
*/
static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
590, /* 59.0 MHz */
737, /* 73.7 MHz */
885, /* 88.5 MHz */
1032, /* 103.2 MHz */
1180, /* 118.0 MHz */
1327, /* 132.7 MHz */
1475, /* 147.5 MHz */
1622, /* 162.2 MHz */
1769, /* 176.9 MHz */
1917, /* 191.7 MHz */
2064, /* 206.4 MHz */
2212, /* 221.2 MHz */
2359, /* 235.9 MHz */
2507, /* 250.7 MHz */
2654, /* 265.4 MHz */
2802 /* 280.2 MHz */
};
/*
* Return the current CPU clock frequency in units of 100kHz
*/
unsigned short get_cclk_frequency(void)
{
return cclk_frequency_100khz[PPCR & 0xf];
}
EXPORT_SYMBOL(get_cclk_frequency);
#ifdef CONFIG_CPU_FREQ
/*
* Validate the speed in khz. If we can't generate the precise
* frequency requested, round it down (to be on the safe side).
*/
unsigned int sa1100_validatespeed(unsigned int khz)
{
int i;
khz /= 100;
for (i = NR_FREQS - 1; i > 0; i--)
if (cclk_frequency_100khz[i] <= khz)
break;
return cclk_frequency_100khz[i] * 100;
}
/*
* Ok, set the CPU frequency. Since we've done the validation
* above, we can match for an exact frequency. If we don't find
* an exact match, we will to set the lowest frequency to be safe.
*/
void sa1100_setspeed(unsigned int khz)
{
int i;
khz /= 100;
for (i = NR_FREQS - 1; i > 0; i--)
if (cclk_frequency_100khz[i] == khz)
break;
//printk("setting ppcr to %d\n", i);
PPCR = i;
}
static int __init sa1100_init_clock(void)
{
cpufreq_init(get_cclk_frequency() * 100);
cpufreq_setfunctions(sa1100_validatespeed, sa1100_setspeed);
return 0;
}
__initcall(sa1100_init_clock);
#endif
/*
* Default power-off for SA1100
*/
static void sa1100_power_off(void)
{
mdelay(100);
cli();
/* disable internal oscillator, float CS lines */
PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
/* enable wake-up on GPIO0 (Assabet...) */
PWER = GFER = GRER = 1;
/*
* set scratchpad to zero, just in case it is used as a
* restart address by the bootloader.
*/
PSPR = 0;
/* enter sleep mode */
PMCR = PMCR_SF;
}
static int __init sa1100_set_poweroff(void)
{
pm_power_off = sa1100_power_off;
return 0;
}
__initcall(sa1100_set_poweroff);
/*
* Common I/O mapping:
*
* Typically, static virtual address mappings are as follow:
*
* 0xe8000000-0xefffffff: flash memory (especially when multiple flash
* banks need to be mapped contigously)
* 0xf0000000-0xf3ffffff: miscellaneous stuff (CPLDs, etc.)
* 0xf4000000-0xf4ffffff: SA-1111
* 0xf5000000-0xf5ffffff: reserved (used by cache flushing area)
* 0xf6000000-0xffffffff: reserved (internal SA1100 IO defined above)
*
* Below 0xe8000000 is reserved for vm allocation.
*
* The machine specific code must provide the extra mapping beside the
* default mapping provided here.
*/
static struct map_desc standard_io_desc[] __initdata = {
/* virtual physical length domain r w c b */
{ 0xf6000000, 0x20000000, 0x01000000, DOMAIN_IO, 1, 1, 0, 0 }, /* PCMCIA0 IO */
{ 0xf7000000, 0x30000000, 0x01000000, DOMAIN_IO, 1, 1, 0, 0 }, /* PCMCIA1 IO */
{ 0xf8000000, 0x80000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* PCM */
{ 0xfa000000, 0x90000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* SCM */
{ 0xfc000000, 0xa0000000, 0x00100000, DOMAIN_IO, 0, 1, 0, 0 }, /* MER */
{ 0xfe000000, 0xb0000000, 0x00200000, DOMAIN_IO, 0, 1, 0, 0 }, /* LCD + DMA */
LAST_DESC
};
void __init sa1100_map_io(void)
{
iotable_init(standard_io_desc);
}
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