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android_kernel_xiaomi_sm8350/arch/arm/mach-pxa/pxa27x.c
Mike Rapoport d082d36ea8 [ARM] pxa: add ability to set suspend mode 
PXA processors have several low-power modes. Currently kernel supports
only one of these modes for PM_SUSPEND_MEM.

This patch adds ability to set desired suspend mode for PXA27x based
machines.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Reviewed-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
2009-06-05 10:32:48 +08:00

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/*
* linux/arch/arm/mach-pxa/pxa27x.c
*
* Author: Nicolas Pitre
* Created: Nov 05, 2002
* Copyright: MontaVista Software Inc.
*
* Code specific to PXA27x aka Bulverde.
*
* 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/suspend.h>
#include <linux/platform_device.h>
#include <linux/sysdev.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <mach/irqs.h>
#include <mach/gpio.h>
#include <mach/pxa27x.h>
#include <mach/reset.h>
#include <mach/ohci.h>
#include <mach/pm.h>
#include <mach/dma.h>
#include <plat/i2c.h>
#include "generic.h"
#include "devices.h"
#include "clock.h"
void pxa27x_clear_otgph(void)
{
if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
PSSR |= PSSR_OTGPH;
}
EXPORT_SYMBOL(pxa27x_clear_otgph);
/* Crystal clock: 13MHz */
#define BASE_CLK 13000000
/*
* Get the clock frequency as reflected by CCSR and the turbo flag.
* We assume these values have been applied via a fcs.
* If info is not 0 we also display the current settings.
*/
unsigned int pxa27x_get_clk_frequency_khz(int info)
{
unsigned long ccsr, clkcfg;
unsigned int l, L, m, M, n2, N, S;
int cccr_a, t, ht, b;
ccsr = CCSR;
cccr_a = CCCR & (1 << 25);
/* Read clkcfg register: it has turbo, b, half-turbo (and f) */
asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
t = clkcfg & (1 << 0);
ht = clkcfg & (1 << 2);
b = clkcfg & (1 << 3);
l = ccsr & 0x1f;
n2 = (ccsr>>7) & 0xf;
m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
L = l * BASE_CLK;
N = (L * n2) / 2;
M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
S = (b) ? L : (L/2);
if (info) {
printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
L / 1000000, (L % 1000000) / 10000, l );
printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
(t) ? "" : "in" );
printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
M / 1000000, (M % 1000000) / 10000, m );
printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
S / 1000000, (S % 1000000) / 10000 );
}
return (t) ? (N/1000) : (L/1000);
}
/*
* Return the current mem clock frequency in units of 10kHz as
* reflected by CCCR[A], B, and L
*/
unsigned int pxa27x_get_memclk_frequency_10khz(void)
{
unsigned long ccsr, clkcfg;
unsigned int l, L, m, M;
int cccr_a, b;
ccsr = CCSR;
cccr_a = CCCR & (1 << 25);
/* Read clkcfg register: it has turbo, b, half-turbo (and f) */
asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
b = clkcfg & (1 << 3);
l = ccsr & 0x1f;
m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
L = l * BASE_CLK;
M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
return (M / 10000);
}
/*
* Return the current LCD clock frequency in units of 10kHz as
*/
static unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
{
unsigned long ccsr;
unsigned int l, L, k, K;
ccsr = CCSR;
l = ccsr & 0x1f;
k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;
L = l * BASE_CLK;
K = L / k;
return (K / 10000);
}
static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
{
return pxa27x_get_lcdclk_frequency_10khz() * 10000;
}
static const struct clkops clk_pxa27x_lcd_ops = {
.enable = clk_cken_enable,
.disable = clk_cken_disable,
.getrate = clk_pxa27x_lcd_getrate,
};
static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops);
static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops);
static DEFINE_CKEN(pxa27x_ffuart, FFUART, 14857000, 1);
static DEFINE_CKEN(pxa27x_btuart, BTUART, 14857000, 1);
static DEFINE_CKEN(pxa27x_stuart, STUART, 14857000, 1);
static DEFINE_CKEN(pxa27x_i2s, I2S, 14682000, 0);
static DEFINE_CKEN(pxa27x_i2c, I2C, 32842000, 0);
static DEFINE_CKEN(pxa27x_usb, USB, 48000000, 5);
static DEFINE_CKEN(pxa27x_mmc, MMC, 19500000, 0);
static DEFINE_CKEN(pxa27x_ficp, FICP, 48000000, 0);
static DEFINE_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0);
static DEFINE_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0);
static DEFINE_CKEN(pxa27x_keypad, KEYPAD, 32768, 0);
static DEFINE_CKEN(pxa27x_ssp1, SSP1, 13000000, 0);
static DEFINE_CKEN(pxa27x_ssp2, SSP2, 13000000, 0);
static DEFINE_CKEN(pxa27x_ssp3, SSP3, 13000000, 0);
static DEFINE_CKEN(pxa27x_pwm0, PWM0, 13000000, 0);
static DEFINE_CKEN(pxa27x_pwm1, PWM1, 13000000, 0);
static DEFINE_CKEN(pxa27x_ac97, AC97, 24576000, 0);
static DEFINE_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0);
static DEFINE_CKEN(pxa27x_msl, MSL, 48000000, 0);
static DEFINE_CKEN(pxa27x_usim, USIM, 48000000, 0);
static DEFINE_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0);
static DEFINE_CKEN(pxa27x_im, IM, 0, 0);
static DEFINE_CKEN(pxa27x_memc, MEMC, 0, 0);
static struct clk_lookup pxa27x_clkregs[] = {
INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL),
INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL),
INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL),
INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL),
INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL),
INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL),
INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL),
INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL),
INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL),
INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"),
INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"),
INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL),
INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL),
INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL),
INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL),
INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL),
INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL),
INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL),
INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL),
INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"),
INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"),
INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"),
INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"),
INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"),
INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
};
#ifdef CONFIG_PM
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
/*
* allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM
*/
static unsigned int pwrmode = PWRMODE_SLEEP;
int __init pxa27x_set_pwrmode(unsigned int mode)
{
switch (mode) {
case PWRMODE_SLEEP:
case PWRMODE_DEEPSLEEP:
pwrmode = mode;
return 0;
}
return -EINVAL;
}
/*
* List of global PXA peripheral registers to preserve.
* More ones like CP and general purpose register values are preserved
* with the stack pointer in sleep.S.
*/
enum {
SLEEP_SAVE_PSTR,
SLEEP_SAVE_CKEN,
SLEEP_SAVE_MDREFR,
SLEEP_SAVE_PCFR,
SLEEP_SAVE_COUNT
};
void pxa27x_cpu_pm_save(unsigned long *sleep_save)
{
SAVE(MDREFR);
SAVE(PCFR);
SAVE(CKEN);
SAVE(PSTR);
}
void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
{
RESTORE(MDREFR);
RESTORE(PCFR);
PSSR = PSSR_RDH | PSSR_PH;
RESTORE(CKEN);
RESTORE(PSTR);
}
void pxa27x_cpu_pm_enter(suspend_state_t state)
{
extern void pxa_cpu_standby(void);
/* ensure voltage-change sequencer not initiated, which hangs */
PCFR &= ~PCFR_FVC;
/* Clear edge-detect status register. */
PEDR = 0xDF12FE1B;
/* Clear reset status */
RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
switch (state) {
case PM_SUSPEND_STANDBY:
pxa_cpu_standby();
break;
case PM_SUSPEND_MEM:
pxa27x_cpu_suspend(pwrmode);
break;
}
}
static int pxa27x_cpu_pm_valid(suspend_state_t state)
{
return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
}
static int pxa27x_cpu_pm_prepare(void)
{
/* set resume return address */
PSPR = virt_to_phys(pxa_cpu_resume);
return 0;
}
static void pxa27x_cpu_pm_finish(void)
{
/* ensure not to come back here if it wasn't intended */
PSPR = 0;
}
static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
.save_count = SLEEP_SAVE_COUNT,
.save = pxa27x_cpu_pm_save,
.restore = pxa27x_cpu_pm_restore,
.valid = pxa27x_cpu_pm_valid,
.enter = pxa27x_cpu_pm_enter,
.prepare = pxa27x_cpu_pm_prepare,
.finish = pxa27x_cpu_pm_finish,
};
static void __init pxa27x_init_pm(void)
{
pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
}
#else
static inline void pxa27x_init_pm(void) {}
#endif
/* PXA27x: Various gpios can issue wakeup events. This logic only
* handles the simple cases, not the WEMUX2 and WEMUX3 options
*/
static int pxa27x_set_wake(unsigned int irq, unsigned int on)
{
int gpio = IRQ_TO_GPIO(irq);
uint32_t mask;
if (gpio >= 0 && gpio < 128)
return gpio_set_wake(gpio, on);
if (irq == IRQ_KEYPAD)
return keypad_set_wake(on);
switch (irq) {
case IRQ_RTCAlrm:
mask = PWER_RTC;
break;
case IRQ_USB:
mask = 1u << 26;
break;
default:
return -EINVAL;
}
if (on)
PWER |= mask;
else
PWER &=~mask;
return 0;
}
void __init pxa27x_init_irq(void)
{
pxa_init_irq(34, pxa27x_set_wake);
pxa_init_gpio(IRQ_GPIO_2_x, 2, 120, pxa27x_set_wake);
}
/*
* device registration specific to PXA27x.
*/
void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
{
local_irq_disable();
PCFR |= PCFR_PI2CEN;
local_irq_enable();
pxa_register_device(&pxa27x_device_i2c_power, info);
}
static struct platform_device *devices[] __initdata = {
&pxa27x_device_udc,
&pxa_device_ffuart,
&pxa_device_btuart,
&pxa_device_stuart,
&pxa_device_i2s,
&sa1100_device_rtc,
&pxa_device_rtc,
&pxa27x_device_ssp1,
&pxa27x_device_ssp2,
&pxa27x_device_ssp3,
&pxa27x_device_pwm0,
&pxa27x_device_pwm1,
};
static struct sys_device pxa27x_sysdev[] = {
{
.cls = &pxa_irq_sysclass,
}, {
.cls = &pxa2xx_mfp_sysclass,
}, {
.cls = &pxa_gpio_sysclass,
},
};
static int __init pxa27x_init(void)
{
int i, ret = 0;
if (cpu_is_pxa27x()) {
reset_status = RCSR;
clks_register(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs));
if ((ret = pxa_init_dma(IRQ_DMA, 32)))
return ret;
pxa27x_init_pm();
for (i = 0; i < ARRAY_SIZE(pxa27x_sysdev); i++) {
ret = sysdev_register(&pxa27x_sysdev[i]);
if (ret)
pr_err("failed to register sysdev[%d]\n", i);
}
ret = platform_add_devices(devices, ARRAY_SIZE(devices));
}
return ret;
}
postcore_initcall(pxa27x_init);
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