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linux-stable-rt/arch/arm/mach-sa1100/generic.c

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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.
*/
#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 <linux/ioport.h>
#include <linux/sched.h> /* just for sched_clock() - funny that */
#include <linux/platform_device.h>
#include <asm/div64.h>
#include <asm/cnt32_to_63.h>
#include <asm/hardware.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include <asm/mach/flash.h>
#include <asm/irq.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 */
};
#if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
/* rounds up(!) */
unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
{
int i;
khz /= 100;
for (i = 0; i < NR_FREQS; i++)
if (cclk_frequency_100khz[i] >= khz)
break;
return i;
}
unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
{
unsigned int freq = 0;
if (idx < NR_FREQS)
freq = cclk_frequency_100khz[idx] * 100;
return freq;
}
/* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
* this platform, anyway.
*/
int sa11x0_verify_speed(struct cpufreq_policy *policy)
{
unsigned int tmp;
if (policy->cpu)
return -EINVAL;
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
/* make sure that at least one frequency is within the policy */
tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
if (tmp > policy->max)
policy->max = tmp;
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
return 0;
}
unsigned int sa11x0_getspeed(unsigned int cpu)
{
if (cpu)
return 0;
return cclk_frequency_100khz[PPCR & 0xf] * 100;
}
#else
/*
* We still need to provide this so building without cpufreq works.
*/
unsigned int cpufreq_get(unsigned int cpu)
{
return cclk_frequency_100khz[PPCR & 0xf] * 100;
}
EXPORT_SYMBOL(cpufreq_get);
#endif
/*
* This is the SA11x0 sched_clock implementation. This has
* a resolution of 271ns, and a maximum value of 32025597s (370 days).
*
* The return value is guaranteed to be monotonic in that range as
* long as there is always less than 582 seconds between successive
* calls to this function.
*
* ( * 1E9 / 3686400 => * 78125 / 288)
*/
unsigned long long sched_clock(void)
{
unsigned long long v = cnt32_to_63(OSCR);
/* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
v *= 78125<<1;
do_div(v, 288<<1);
return v;
}
/*
* Default power-off for SA1100
*/
static void sa1100_power_off(void)
{
mdelay(100);
local_irq_disable();
/* 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 struct resource sa11x0udc_resources[] = {
[0] = {
.start = 0x80000000,
.end = 0x8000ffff,
.flags = IORESOURCE_MEM,
},
};
static u64 sa11x0udc_dma_mask = 0xffffffffUL;
static struct platform_device sa11x0udc_device = {
.name = "sa11x0-udc",
.id = -1,
.dev = {
.dma_mask = &sa11x0udc_dma_mask,
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(sa11x0udc_resources),
.resource = sa11x0udc_resources,
};
static struct resource sa11x0uart1_resources[] = {
[0] = {
.start = 0x80010000,
.end = 0x8001ffff,
.flags = IORESOURCE_MEM,
},
};
static struct platform_device sa11x0uart1_device = {
.name = "sa11x0-uart",
.id = 1,
.num_resources = ARRAY_SIZE(sa11x0uart1_resources),
.resource = sa11x0uart1_resources,
};
static struct resource sa11x0uart3_resources[] = {
[0] = {
.start = 0x80050000,
.end = 0x8005ffff,
.flags = IORESOURCE_MEM,
},
};
static struct platform_device sa11x0uart3_device = {
.name = "sa11x0-uart",
.id = 3,
.num_resources = ARRAY_SIZE(sa11x0uart3_resources),
.resource = sa11x0uart3_resources,
};
static struct resource sa11x0mcp_resources[] = {
[0] = {
.start = 0x80060000,
.end = 0x8006ffff,
.flags = IORESOURCE_MEM,
},
};
static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
static struct platform_device sa11x0mcp_device = {
.name = "sa11x0-mcp",
.id = -1,
.dev = {
.dma_mask = &sa11x0mcp_dma_mask,
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(sa11x0mcp_resources),
.resource = sa11x0mcp_resources,
};
void sa11x0_set_mcp_data(struct mcp_plat_data *data)
{
sa11x0mcp_device.dev.platform_data = data;
}
static struct resource sa11x0ssp_resources[] = {
[0] = {
.start = 0x80070000,
.end = 0x8007ffff,
.flags = IORESOURCE_MEM,
},
};
static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
static struct platform_device sa11x0ssp_device = {
.name = "sa11x0-ssp",
.id = -1,
.dev = {
.dma_mask = &sa11x0ssp_dma_mask,
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(sa11x0ssp_resources),
.resource = sa11x0ssp_resources,
};
static struct resource sa11x0fb_resources[] = {
[0] = {
.start = 0xb0100000,
.end = 0xb010ffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_LCD,
.end = IRQ_LCD,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device sa11x0fb_device = {
.name = "sa11x0-fb",
.id = -1,
.dev = {
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(sa11x0fb_resources),
.resource = sa11x0fb_resources,
};
static struct platform_device sa11x0pcmcia_device = {
.name = "sa11x0-pcmcia",
.id = -1,
};
static struct platform_device sa11x0mtd_device = {
.name = "flash",
.id = -1,
};
void sa11x0_set_flash_data(struct flash_platform_data *flash,
struct resource *res, int nr)
{
flash->name = "sa1100";
sa11x0mtd_device.dev.platform_data = flash;
sa11x0mtd_device.resource = res;
sa11x0mtd_device.num_resources = nr;
}
static struct resource sa11x0ir_resources[] = {
{
.start = __PREG(Ser2UTCR0),
.end = __PREG(Ser2UTCR0) + 0x24 - 1,
.flags = IORESOURCE_MEM,
}, {
.start = __PREG(Ser2HSCR0),
.end = __PREG(Ser2HSCR0) + 0x1c - 1,
.flags = IORESOURCE_MEM,
}, {
.start = __PREG(Ser2HSCR2),
.end = __PREG(Ser2HSCR2) + 0x04 - 1,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_Ser2ICP,
.end = IRQ_Ser2ICP,
.flags = IORESOURCE_IRQ,
}
};
static struct platform_device sa11x0ir_device = {
.name = "sa11x0-ir",
.id = -1,
.num_resources = ARRAY_SIZE(sa11x0ir_resources),
.resource = sa11x0ir_resources,
};
void sa11x0_set_irda_data(struct irda_platform_data *irda)
{
sa11x0ir_device.dev.platform_data = irda;
}
static struct platform_device sa11x0rtc_device = {
.name = "sa1100-rtc",
.id = -1,
};
static struct platform_device *sa11x0_devices[] __initdata = {
&sa11x0udc_device,
&sa11x0uart1_device,
&sa11x0uart3_device,
&sa11x0mcp_device,
&sa11x0ssp_device,
&sa11x0pcmcia_device,
&sa11x0fb_device,
&sa11x0mtd_device,
&sa11x0rtc_device,
};
static int __init sa1100_init(void)
{
pm_power_off = sa1100_power_off;
if (sa11x0ir_device.dev.platform_data)
platform_device_register(&sa11x0ir_device);
return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
}
arch_initcall(sa1100_init);
void (*sa1100fb_backlight_power)(int on);
void (*sa1100fb_lcd_power)(int on);
EXPORT_SYMBOL(sa1100fb_backlight_power);
EXPORT_SYMBOL(sa1100fb_lcd_power);
/*
* Common I/O mapping:
*
* Typically, static virtual address mappings are as follow:
*
* 0xf0000000-0xf3ffffff: miscellaneous stuff (CPLDs, etc.)
* 0xf4000000-0xf4ffffff: SA-1111
* 0xf5000000-0xf5ffffff: reserved (used by cache flushing area)
* 0xf6000000-0xfffeffff: reserved (internal SA1100 IO defined above)
* 0xffff0000-0xffff0fff: SA1100 exception vectors
* 0xffff2000-0xffff2fff: Minicache copy_user_page area
*
* 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 = {
{ /* PCM */
.virtual = 0xf8000000,
.pfn = __phys_to_pfn(0x80000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* SCM */
.virtual = 0xfa000000,
.pfn = __phys_to_pfn(0x90000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* MER */
.virtual = 0xfc000000,
.pfn = __phys_to_pfn(0xa0000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* LCD + DMA */
.virtual = 0xfe000000,
.pfn = __phys_to_pfn(0xb0000000),
.length = 0x00200000,
.type = MT_DEVICE
},
};
void __init sa1100_map_io(void)
{
iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
}
/*
* Disable the memory bus request/grant signals on the SA1110 to
* ensure that we don't receive spurious memory requests. We set
* the MBGNT signal false to ensure the SA1111 doesn't own the
* SDRAM bus.
*/
void __init sa1110_mb_disable(void)
{
unsigned long flags;
local_irq_save(flags);
PGSR &= ~GPIO_MBGNT;
GPCR = GPIO_MBGNT;
GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
local_irq_restore(flags);
}
/*
* If the system is going to use the SA-1111 DMA engines, set up
* the memory bus request/grant pins.
*/
void __init sa1110_mb_enable(void)
{
unsigned long flags;
local_irq_save(flags);
PGSR &= ~GPIO_MBGNT;
GPCR = GPIO_MBGNT;
GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
TUCR |= TUCR_MR;
local_irq_restore(flags);
}
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