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linux/arch/arm/mach-sa1100/generic.c
Russell King 45c7f75fd4 MFD: mcp-sa11x0: convert mcp-sa11x0 to use platform resources 
Patch taken from af9081ae64 (ARM: sa1100: Refactor mcp-sa11x0 to use
platform resources.) by Jochen Friedrich <jochen@scram.de>, and fixes
applied.

We can safely do this now that we have sanitized host removal; the
original patch had use-after-free bugs in the removal code.  Not only
that, but there was no checking of the ioremap() return.

The final change over Jochen's patch is that we wrap the base pointer
selection inside the various register indexes, which reduces the
possibility of the wrong register index being used.

Acked-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-02-03 17:38:07 +00:00

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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/gpio.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 <linux/ioport.h>
#include <linux/platform_device.h>
#include <asm/div64.h>
#include <mach/hardware.h>
#include <asm/system.h>
#include <asm/mach/map.h>
#include <asm/mach/flash.h>
#include <asm/irq.h>
#include "generic.h"
unsigned int reset_status;
EXPORT_SYMBOL(reset_status);
#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 */
};
/* 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;
}
/*
* 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;
}
void sa11x0_restart(char mode, const char *cmd)
{
if (mode == 's') {
/* Jump into ROM at address 0 */
soft_restart(0);
} else {
/* Use on-chip reset capability */
RSRR = RSRR_SWR;
}
}
static void sa11x0_register_device(struct platform_device *dev, void *data)
{
int err;
dev->dev.platform_data = data;
err = platform_device_register(dev);
if (err)
printk(KERN_ERR "Unable to register device %s: %d\n",
dev->name, err);
}
static struct resource sa11x0udc_resources[] = {
[0] = {
.start = __PREG(Ser0UDCCR),
.end = __PREG(Ser0UDCCR) + 0xffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_Ser0UDC,
.end = IRQ_Ser0UDC,
.flags = IORESOURCE_IRQ,
},
};
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 = __PREG(Ser1UTCR0),
.end = __PREG(Ser1UTCR0) + 0xffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_Ser1UART,
.end = IRQ_Ser1UART,
.flags = IORESOURCE_IRQ,
},
};
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 = __PREG(Ser3UTCR0),
.end = __PREG(Ser3UTCR0) + 0xffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_Ser3UART,
.end = IRQ_Ser3UART,
.flags = IORESOURCE_IRQ,
},
};
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 = __PREG(Ser4MCCR0),
.end = __PREG(Ser4MCCR0) + 0xffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = __PREG(Ser4MCCR1),
.end = __PREG(Ser4MCCR1) + 4 - 1,
.flags = IORESOURCE_MEM,
},
[2] = {
.start = IRQ_Ser4MCP,
.end = IRQ_Ser4MCP,
.flags = IORESOURCE_IRQ,
},
};
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 __init sa11x0_ppc_configure_mcp(void)
{
/* Setup the PPC unit for the MCP */
PPDR &= ~PPC_RXD4;
PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
PSDR |= PPC_RXD4;
PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
}
void sa11x0_register_mcp(struct mcp_plat_data *data)
{
sa11x0_register_device(&sa11x0mcp_device, data);
}
static struct resource sa11x0ssp_resources[] = {
[0] = {
.start = 0x80070000,
.end = 0x8007ffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_Ser4SSP,
.end = IRQ_Ser4SSP,
.flags = IORESOURCE_IRQ,
},
};
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 = "sa1100-mtd",
.id = -1,
};
void sa11x0_register_mtd(struct flash_platform_data *flash,
struct resource *res, int nr)
{
flash->name = "sa1100";
sa11x0mtd_device.resource = res;
sa11x0mtd_device.num_resources = nr;
sa11x0_register_device(&sa11x0mtd_device, flash);
}
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_register_irda(struct irda_platform_data *irda)
{
sa11x0_register_device(&sa11x0ir_device, irda);
}
static struct resource sa11x0rtc_resources[] = {
[0] = {
.start = 0x90010000,
.end = 0x900100ff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_RTC1Hz,
.end = IRQ_RTC1Hz,
.flags = IORESOURCE_IRQ,
},
[2] = {
.start = IRQ_RTCAlrm,
.end = IRQ_RTCAlrm,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device sa11x0rtc_device = {
.name = "sa1100-rtc",
.id = -1,
.resource = sa11x0rtc_resources,
.num_resources = ARRAY_SIZE(sa11x0rtc_resources),
};
static struct platform_device *sa11x0_devices[] __initdata = {
&sa11x0udc_device,
&sa11x0uart1_device,
&sa11x0uart3_device,
&sa11x0ssp_device,
&sa11x0pcmcia_device,
&sa11x0fb_device,
&sa11x0rtc_device,
};
static int __init sa1100_init(void)
{
pm_power_off = sa1100_power_off;
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 __devinit 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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