/*
* linux/arch/arm/mach-pxa/pxa25x.c
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software Inc.
*
* Code specific to PXA21x/25x/26x variants.
*
* 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/platform_device.h>
#include <linux/suspend.h>
#include <linux/sysdev.h>
#include <asm/hardware.h>
#include <asm/arch/irqs.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/pxa2xx-regs.h>
#include <asm/arch/mfp-pxa25x.h>
#include <asm/arch/pm.h>
#include <asm/arch/dma.h>
#include "generic.h"
#include "devices.h"
#include "clock.h"
/*
* Various clock factors driven by the CCCR register.
*/
/* Crystal Frequency to Memory Frequency Multiplier (L) */
static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
/* Memory Frequency to Run Mode Frequency Multiplier (M) */
static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
/* Note: we store the value N * 2 here. */
static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
/* Crystal clock */
#define BASE_CLK 3686400
/*
* Get the clock frequency as reflected by CCCR 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 pxa25x_get_clk_frequency_khz(int info)
{
unsigned long cccr, turbo;
unsigned int l, L, m, M, n2, N;
cccr = CCCR;
asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
l = L_clk_mult[(cccr >> 0) & 0x1f];
m = M_clk_mult[(cccr >> 5) & 0x03];
n2 = N2_clk_mult[(cccr >> 7) & 0x07];
L = l * BASE_CLK;
M = m * L;
N = n2 * M / 2;
if(info)
{
L += 5000;
printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
L / 1000000, (L % 1000000) / 10000, l );
M += 5000;
printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
M / 1000000, (M % 1000000) / 10000, m );
N += 5000;
printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
(turbo & 1) ? "" : "in" );
}
return (turbo & 1) ? (N/1000) : (M/1000);
}
/*
* Return the current memory clock frequency in units of 10kHz
*/
unsigned int pxa25x_get_memclk_frequency_10khz(void)
{
return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
}
static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
{
return pxa25x_get_memclk_frequency_10khz() * 10000;
}
static const struct clkops clk_pxa25x_lcd_ops = {
.enable = clk_cken_enable,
.disable = clk_cken_disable,
.getrate = clk_pxa25x_lcd_getrate,
};
/*
* 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
* 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
* 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
*/
static struct clk pxa25x_hwuart_clk =
INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev)
;
/*
* PXA 2xx clock declarations. Order is important (see aliases below)
* Please be careful not to disrupt the ordering.
*/
static struct clk pxa25x_clks[] = {
INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
INIT_CKEN("UARTCLK", STUART, 14745600, 1, NULL),
INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa_device_udc.dev),
INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),
INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),
INIT_CKEN("SSPCLK", SSP, 3686400, 0, &pxa25x_device_ssp.dev),
INIT_CKEN("SSPCLK", NSSP, 3686400, 0, &pxa25x_device_nssp.dev),
INIT_CKEN("SSPCLK", ASSP, 3686400, 0, &pxa25x_device_assp.dev),
INIT_CKEN("PWMCLK", PWM0, 3686400, 0, &pxa25x_device_pwm0.dev),
INIT_CKEN("PWMCLK", PWM1, 3686400, 0, &pxa25x_device_pwm1.dev),
INIT_CKEN("AC97CLK", AC97, 24576000, 0, NULL),
/*
INIT_CKEN("I2SCLK", I2S, 14745600, 0, NULL),
*/
INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
};
static struct clk gpio7_clk = INIT_CKOTHER("GPIO7_CK", &pxa25x_clks[4], NULL);
#ifdef CONFIG_PM
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
/*
* 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_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
SLEEP_SAVE_PSTR,
SLEEP_SAVE_CKEN,
SLEEP_SAVE_COUNT
};
static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
{
SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
SAVE(GAFR0_L); SAVE(GAFR0_U);
SAVE(GAFR1_L); SAVE(GAFR1_U);
SAVE(GAFR2_L); SAVE(GAFR2_U);
SAVE(CKEN);
SAVE(PSTR);
/* Clear GPIO transition detect bits */
GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
}
static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
{
/* ensure not to come back here if it wasn't intended */
PSPR = 0;
/* restore registers */
RESTORE(GAFR0_L); RESTORE(GAFR0_U);
RESTORE(GAFR1_L); RESTORE(GAFR1_U);
RESTORE(GAFR2_L); RESTORE(GAFR2_U);
RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
PSSR = PSSR_RDH | PSSR_PH;
RESTORE(CKEN);
RESTORE(PSTR);
}
static void pxa25x_cpu_pm_enter(suspend_state_t state)
{
/* Clear reset status */
RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
switch (state) {
case PM_SUSPEND_MEM:
/* set resume return address */
PSPR = virt_to_phys(pxa_cpu_resume);
pxa25x_cpu_suspend(PWRMODE_SLEEP);
break;
}
}
static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
.save_count = SLEEP_SAVE_COUNT,
.valid = suspend_valid_only_mem,
.save = pxa25x_cpu_pm_save,
.restore = pxa25x_cpu_pm_restore,
.enter = pxa25x_cpu_pm_enter,
};
static void __init pxa25x_init_pm(void)
{
pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
}
#else
static inline void pxa25x_init_pm(void) {}
#endif
/* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
*/
static int pxa25x_set_wake(unsigned int irq, unsigned int on)
{
int gpio = IRQ_TO_GPIO(irq);
uint32_t mask = 0;
if (gpio >= 0 && gpio < 85)
return gpio_set_wake(gpio, on);
if (irq == IRQ_RTCAlrm) {
mask = PWER_RTC;
goto set_pwer;
}
return -EINVAL;
set_pwer:
if (on)
PWER |= mask;
else
PWER &=~mask;
return 0;
}
void __init pxa25x_init_irq(void)
{
pxa_init_irq(32, pxa25x_set_wake);
pxa_init_gpio(85, pxa25x_set_wake);
}
static struct platform_device *pxa25x_devices[] __initdata = {
&pxa_device_udc,
&pxa_device_ffuart,
&pxa_device_btuart,
&pxa_device_stuart,
&pxa_device_i2s,
&pxa_device_rtc,
&pxa25x_device_ssp,
&pxa25x_device_nssp,
&pxa25x_device_assp,
&pxa25x_device_pwm0,
&pxa25x_device_pwm1,
};
static struct sys_device pxa25x_sysdev[] = {
{
.cls = &pxa_irq_sysclass,
}, {
.cls = &pxa_gpio_sysclass,
},
};
static int __init pxa25x_init(void)
{
int i, ret = 0;
/* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
if (cpu_is_pxa25x())
clks_register(&pxa25x_hwuart_clk, 1);
if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));
if ((ret = pxa_init_dma(16)))
return ret;
pxa25x_init_pm();
for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) {
ret = sysdev_register(&pxa25x_sysdev[i]);
if (ret)
pr_err("failed to register sysdev[%d]\n", i);
}
ret = platform_add_devices(pxa25x_devices,
ARRAY_SIZE(pxa25x_devices));
if (ret)
return ret;
}
/* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
if (cpu_is_pxa25x())
ret = platform_device_register(&pxa_device_hwuart);
clks_register(&gpio7_clk, 1);
return ret;
}
postcore_initcall(pxa25x_init);
