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alistair23-linux/arch/arm/mach-pxa/generic.c
Eric Miao 7053acbd78 [ARM] 4304/1: removes the unnecessary bit number from CKENnn_XXXX 
This patch removes the unnecessary bit number from CKENnn_XXXX
definitions for PXA, so that

	CKEN0_PWM0 --> CKEN_PWM0
	CKEN1_PWM1 --> CKEN_PWM1
	...
	CKEN24_CAMERA --> CKEN_CAMERA

The reasons for the change of these defitions are:

1. they do not scale - they are currently valid for pxa2xx, but
definitely not valid for pxa3xx, e.g., pxa3xx has bit 3 for camera
instead of bit 24

2. they are unnecessary - the peripheral name within the definition
has already announced its usage, we don't need those bit numbers
to know which peripheral we are going to enable/disable clock for

3. they are inconvenient - think about this: a driver programmer
for pxa has to remember which bit in the CKEN register to turn
on/off

Another change in the patch is to make the definitions equal to its
clock bit index, so that

   #define CKEN_CAMERA  (24)

instead of

   #define CKEN_CAMERA  (1 << 24)

this change, however, will add a run-time bit shift operation in
pxa_set_cken(), but the benefit of this change is that it scales
when bit index exceeds 32, e.g., pxa3xx has two registers CKENA
and CKENB, totally 64 bit for this, suppose CAMERA clock enabling
bit is CKENB:10, one can simply define CKEN_CAMERA to be (32 + 10)
and so that pxa_set_cken() need minimum change to adapt to that.

Signed-off-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-04-21 23:14:01 +01:00

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/*
* linux/arch/arm/mach-pxa/generic.c
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software Inc.
*
* Code common to all PXA 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 PXA machines which can be overridden later if
* need be.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/pm.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <asm/cnt32_to_63.h>
#include <asm/div64.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/gpio.h>
#include <asm/arch/udc.h>
#include <asm/arch/pxafb.h>
#include <asm/arch/mmc.h>
#include <asm/arch/irda.h>
#include <asm/arch/i2c.h>
#include "generic.h"
/*
* This is the PXA2xx sched_clock implementation. This has a resolution
* of at least 308ns and a maximum value that depends on the value of
* CLOCK_TICK_RATE.
*
* 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.
*/
unsigned long long sched_clock(void)
{
unsigned long long v = cnt32_to_63(OSCR);
/* Note: top bit ov v needs cleared unless multiplier is even. */
#if CLOCK_TICK_RATE == 3686400
/* 1E9 / 3686400 => 78125 / 288, max value = 32025597s (370 days). */
/* The <<1 is used to get rid of tick.hi top bit */
v *= 78125<<1;
do_div(v, 288<<1);
#elif CLOCK_TICK_RATE == 3250000
/* 1E9 / 3250000 => 4000 / 13, max value = 709490156s (8211 days) */
v *= 4000;
do_div(v, 13);
#elif CLOCK_TICK_RATE == 3249600
/* 1E9 / 3249600 => 625000 / 2031, max value = 4541295s (52 days) */
v *= 625000;
do_div(v, 2031);
#else
#warning "consider fixing sched_clock for your value of CLOCK_TICK_RATE"
/*
* 96-bit math to perform tick * NSEC_PER_SEC / CLOCK_TICK_RATE for
* any value of CLOCK_TICK_RATE. Max value is in the 80 thousand
* years range and truncation to unsigned long long limits it to
* sched_clock's max range of ~584 years. This is nice but with
* higher computation cost.
*/
{
union {
unsigned long long val;
struct { unsigned long lo, hi; };
} x;
unsigned long long y;
x.val = v;
x.hi &= 0x7fffffff;
y = (unsigned long long)x.lo * NSEC_PER_SEC;
x.lo = y;
y = (y >> 32) + (unsigned long long)x.hi * NSEC_PER_SEC;
x.hi = do_div(y, CLOCK_TICK_RATE);
do_div(x.val, CLOCK_TICK_RATE);
x.hi += y;
v = x.val;
}
#endif
return v;
}
/*
* Handy function to set GPIO alternate functions
*/
int pxa_gpio_mode(int gpio_mode)
{
unsigned long flags;
int gpio = gpio_mode & GPIO_MD_MASK_NR;
int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
int gafr;
if (gpio > PXA_LAST_GPIO)
return -EINVAL;
local_irq_save(flags);
if (gpio_mode & GPIO_DFLT_LOW)
GPCR(gpio) = GPIO_bit(gpio);
else if (gpio_mode & GPIO_DFLT_HIGH)
GPSR(gpio) = GPIO_bit(gpio);
if (gpio_mode & GPIO_MD_MASK_DIR)
GPDR(gpio) |= GPIO_bit(gpio);
else
GPDR(gpio) &= ~GPIO_bit(gpio);
gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
GAFR(gpio) = gafr | (fn << (((gpio) & 0xf)*2));
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(pxa_gpio_mode);
/*
* Return GPIO level
*/
int pxa_gpio_get_value(unsigned gpio)
{
return __gpio_get_value(gpio);
}
EXPORT_SYMBOL(pxa_gpio_get_value);
/*
* Set output GPIO level
*/
void pxa_gpio_set_value(unsigned gpio, int value)
{
__gpio_set_value(gpio, value);
}
EXPORT_SYMBOL(pxa_gpio_set_value);
/*
* Routine to safely enable or disable a clock in the CKEN
*/
void pxa_set_cken(int clock, int enable)
{
unsigned long flags;
local_irq_save(flags);
if (enable)
CKEN |= (1 << clock);
else
CKEN &= ~(1 << clock);
local_irq_restore(flags);
}
EXPORT_SYMBOL(pxa_set_cken);
/*
* Intel PXA2xx internal register mapping.
*
* Note 1: not all PXA2xx variants implement all those addresses.
*
* Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
* and cache flush area.
*/
static struct map_desc standard_io_desc[] __initdata = {
{ /* Devs */
.virtual = 0xf2000000,
.pfn = __phys_to_pfn(0x40000000),
.length = 0x02000000,
.type = MT_DEVICE
}, { /* LCD */
.virtual = 0xf4000000,
.pfn = __phys_to_pfn(0x44000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* Mem Ctl */
.virtual = 0xf6000000,
.pfn = __phys_to_pfn(0x48000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* USB host */
.virtual = 0xf8000000,
.pfn = __phys_to_pfn(0x4c000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* Camera */
.virtual = 0xfa000000,
.pfn = __phys_to_pfn(0x50000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* IMem ctl */
.virtual = 0xfe000000,
.pfn = __phys_to_pfn(0x58000000),
.length = 0x00100000,
.type = MT_DEVICE
}, { /* UNCACHED_PHYS_0 */
.virtual = 0xff000000,
.pfn = __phys_to_pfn(0x00000000),
.length = 0x00100000,
.type = MT_DEVICE
}
};
void __init pxa_map_io(void)
{
iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
get_clk_frequency_khz(1);
}
static struct resource pxamci_resources[] = {
[0] = {
.start = 0x41100000,
.end = 0x41100fff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_MMC,
.end = IRQ_MMC,
.flags = IORESOURCE_IRQ,
},
};
static u64 pxamci_dmamask = 0xffffffffUL;
static struct platform_device pxamci_device = {
.name = "pxa2xx-mci",
.id = -1,
.dev = {
.dma_mask = &pxamci_dmamask,
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(pxamci_resources),
.resource = pxamci_resources,
};
void __init pxa_set_mci_info(struct pxamci_platform_data *info)
{
pxamci_device.dev.platform_data = info;
}
static struct pxa2xx_udc_mach_info pxa_udc_info;
void __init pxa_set_udc_info(struct pxa2xx_udc_mach_info *info)
{
memcpy(&pxa_udc_info, info, sizeof *info);
}
static struct resource pxa2xx_udc_resources[] = {
[0] = {
.start = 0x40600000,
.end = 0x4060ffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_USB,
.end = IRQ_USB,
.flags = IORESOURCE_IRQ,
},
};
static u64 udc_dma_mask = ~(u32)0;
static struct platform_device udc_device = {
.name = "pxa2xx-udc",
.id = -1,
.resource = pxa2xx_udc_resources,
.num_resources = ARRAY_SIZE(pxa2xx_udc_resources),
.dev = {
.platform_data = &pxa_udc_info,
.dma_mask = &udc_dma_mask,
}
};
static struct resource pxafb_resources[] = {
[0] = {
.start = 0x44000000,
.end = 0x4400ffff,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_LCD,
.end = IRQ_LCD,
.flags = IORESOURCE_IRQ,
},
};
static u64 fb_dma_mask = ~(u64)0;
static struct platform_device pxafb_device = {
.name = "pxa2xx-fb",
.id = -1,
.dev = {
.dma_mask = &fb_dma_mask,
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(pxafb_resources),
.resource = pxafb_resources,
};
void __init set_pxa_fb_info(struct pxafb_mach_info *info)
{
pxafb_device.dev.platform_data = info;
}
void __init set_pxa_fb_parent(struct device *parent_dev)
{
pxafb_device.dev.parent = parent_dev;
}
static struct platform_device ffuart_device = {
.name = "pxa2xx-uart",
.id = 0,
};
static struct platform_device btuart_device = {
.name = "pxa2xx-uart",
.id = 1,
};
static struct platform_device stuart_device = {
.name = "pxa2xx-uart",
.id = 2,
};
static struct platform_device hwuart_device = {
.name = "pxa2xx-uart",
.id = 3,
};
static struct resource i2c_resources[] = {
{
.start = 0x40301680,
.end = 0x403016a3,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_I2C,
.end = IRQ_I2C,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device i2c_device = {
.name = "pxa2xx-i2c",
.id = 0,
.resource = i2c_resources,
.num_resources = ARRAY_SIZE(i2c_resources),
};
#ifdef CONFIG_PXA27x
static struct resource i2c_power_resources[] = {
{
.start = 0x40f00180,
.end = 0x40f001a3,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_PWRI2C,
.end = IRQ_PWRI2C,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device i2c_power_device = {
.name = "pxa2xx-i2c",
.id = 1,
.resource = i2c_power_resources,
.num_resources = ARRAY_SIZE(i2c_resources),
};
#endif
void __init pxa_set_i2c_info(struct i2c_pxa_platform_data *info)
{
i2c_device.dev.platform_data = info;
}
static struct resource i2s_resources[] = {
{
.start = 0x40400000,
.end = 0x40400083,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_I2S,
.end = IRQ_I2S,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device i2s_device = {
.name = "pxa2xx-i2s",
.id = -1,
.resource = i2s_resources,
.num_resources = ARRAY_SIZE(i2s_resources),
};
static u64 pxaficp_dmamask = ~(u32)0;
static struct platform_device pxaficp_device = {
.name = "pxa2xx-ir",
.id = -1,
.dev = {
.dma_mask = &pxaficp_dmamask,
.coherent_dma_mask = 0xffffffff,
},
};
void __init pxa_set_ficp_info(struct pxaficp_platform_data *info)
{
pxaficp_device.dev.platform_data = info;
}
static struct platform_device pxartc_device = {
.name = "sa1100-rtc",
.id = -1,
};
static struct platform_device *devices[] __initdata = {
&pxamci_device,
&udc_device,
&pxafb_device,
&ffuart_device,
&btuart_device,
&stuart_device,
&pxaficp_device,
&i2c_device,
#ifdef CONFIG_PXA27x
&i2c_power_device,
#endif
&i2s_device,
&pxartc_device,
};
static int __init pxa_init(void)
{
int cpuid, ret;
ret = platform_add_devices(devices, ARRAY_SIZE(devices));
if (ret)
return ret;
/* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
cpuid = read_cpuid(CPUID_ID);
if (((cpuid >> 4) & 0xfff) == 0x2d0 ||
((cpuid >> 4) & 0xfff) == 0x290)
ret = platform_device_register(&hwuart_device);
return ret;
}
subsys_initcall(pxa_init);
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