linux/arch/arm/mach-pxa/pxa3xx.c
Mike Rapoport 9ba63c4fa1 [ARM] 5201/1: PXA3xx: Add support for power i2c bus
Add power I2C support for PXA3xx processors

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-09-09 16:32:51 +01:00

617 lines
13 KiB
C

/*
* linux/arch/arm/mach-pxa/pxa3xx.c
*
* code specific to pxa3xx aka Monahans
*
* Copyright (C) 2006 Marvell International Ltd.
*
* 2007-09-02: eric miao <eric.miao@marvell.com>
* initial version
*
* 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/pm.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/sysdev.h>
#include <mach/hardware.h>
#include <mach/pxa3xx-regs.h>
#include <mach/reset.h>
#include <mach/ohci.h>
#include <mach/pm.h>
#include <mach/dma.h>
#include <mach/ssp.h>
#include "generic.h"
#include "devices.h"
#include "clock.h"
/* Crystal clock: 13MHz */
#define BASE_CLK 13000000
/* Ring Oscillator Clock: 60MHz */
#define RO_CLK 60000000
#define ACCR_D0CS (1 << 26)
#define ACCR_PCCE (1 << 11)
/* crystal frequency to static memory controller multiplier (SMCFS) */
static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
/* crystal frequency to HSIO bus frequency multiplier (HSS) */
static unsigned char hss_mult[4] = { 8, 12, 16, 0 };
/*
* 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 pxa3xx_get_clk_frequency_khz(int info)
{
unsigned long acsr, xclkcfg;
unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
/* Read XCLKCFG register turbo bit */
__asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
t = xclkcfg & 0x1;
acsr = ACSR;
xl = acsr & 0x1f;
xn = (acsr >> 8) & 0x7;
hss = (acsr >> 14) & 0x3;
XL = xl * BASE_CLK;
XN = xn * XL;
ro = acsr & ACCR_D0CS;
CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
if (info) {
pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
(ro) ? "" : "in");
pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
XL / 1000000, (XL % 1000000) / 10000, xl);
pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
XN / 1000000, (XN % 1000000) / 10000, xn,
(t) ? "" : "in");
pr_info("HSIO bus clock: %d.%02dMHz\n",
HSS / 1000000, (HSS % 1000000) / 10000);
}
return CLK / 1000;
}
/*
* Return the current static memory controller clock frequency
* in units of 10kHz
*/
unsigned int pxa3xx_get_memclk_frequency_10khz(void)
{
unsigned long acsr;
unsigned int smcfs, clk = 0;
acsr = ACSR;
smcfs = (acsr >> 23) & 0x7;
clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK;
return (clk / 10000);
}
void pxa3xx_clear_reset_status(unsigned int mask)
{
/* RESET_STATUS_* has a 1:1 mapping with ARSR */
ARSR = mask;
}
/*
* Return the current AC97 clock frequency.
*/
static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk)
{
unsigned long rate = 312000000;
unsigned long ac97_div;
ac97_div = AC97_DIV;
/* This may loose precision for some rates but won't for the
* standard 24.576MHz.
*/
rate /= (ac97_div >> 12) & 0x7fff;
rate *= (ac97_div & 0xfff);
return rate;
}
/*
* Return the current HSIO bus clock frequency
*/
static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
{
unsigned long acsr;
unsigned int hss, hsio_clk;
acsr = ACSR;
hss = (acsr >> 14) & 0x3;
hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
return hsio_clk;
}
void clk_pxa3xx_cken_enable(struct clk *clk)
{
unsigned long mask = 1ul << (clk->cken & 0x1f);
if (clk->cken < 32)
CKENA |= mask;
else
CKENB |= mask;
}
void clk_pxa3xx_cken_disable(struct clk *clk)
{
unsigned long mask = 1ul << (clk->cken & 0x1f);
if (clk->cken < 32)
CKENA &= ~mask;
else
CKENB &= ~mask;
}
const struct clkops clk_pxa3xx_cken_ops = {
.enable = clk_pxa3xx_cken_enable,
.disable = clk_pxa3xx_cken_disable,
};
static const struct clkops clk_pxa3xx_hsio_ops = {
.enable = clk_pxa3xx_cken_enable,
.disable = clk_pxa3xx_cken_disable,
.getrate = clk_pxa3xx_hsio_getrate,
};
static const struct clkops clk_pxa3xx_ac97_ops = {
.enable = clk_pxa3xx_cken_enable,
.disable = clk_pxa3xx_cken_disable,
.getrate = clk_pxa3xx_ac97_getrate,
};
static void clk_pout_enable(struct clk *clk)
{
OSCC |= OSCC_PEN;
}
static void clk_pout_disable(struct clk *clk)
{
OSCC &= ~OSCC_PEN;
}
static const struct clkops clk_pout_ops = {
.enable = clk_pout_enable,
.disable = clk_pout_disable,
};
static void clk_dummy_enable(struct clk *clk)
{
}
static void clk_dummy_disable(struct clk *clk)
{
}
static const struct clkops clk_dummy_ops = {
.enable = clk_dummy_enable,
.disable = clk_dummy_disable,
};
static struct clk pxa3xx_clks[] = {
{
.name = "CLK_POUT",
.ops = &clk_pout_ops,
.rate = 13000000,
.delay = 70,
},
/* Power I2C clock is always on */
{
.name = "I2CCLK",
.ops = &clk_dummy_ops,
.dev = &pxa3xx_device_i2c_power.dev,
},
PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
PXA3xx_CK("AC97CLK", AC97, &clk_pxa3xx_ac97_ops, NULL),
PXA3xx_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
PXA3xx_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
PXA3xx_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
PXA3xx_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev),
PXA3xx_CKEN("UDCCLK", UDC, 48000000, 5, &pxa27x_device_udc.dev),
PXA3xx_CKEN("USBCLK", USBH, 48000000, 0, &pxa27x_device_ohci.dev),
PXA3xx_CKEN("KBDCLK", KEYPAD, 32768, 0, &pxa27x_device_keypad.dev),
PXA3xx_CKEN("SSPCLK", SSP1, 13000000, 0, &pxa27x_device_ssp1.dev),
PXA3xx_CKEN("SSPCLK", SSP2, 13000000, 0, &pxa27x_device_ssp2.dev),
PXA3xx_CKEN("SSPCLK", SSP3, 13000000, 0, &pxa27x_device_ssp3.dev),
PXA3xx_CKEN("SSPCLK", SSP4, 13000000, 0, &pxa3xx_device_ssp4.dev),
PXA3xx_CKEN("PWMCLK", PWM0, 13000000, 0, &pxa27x_device_pwm0.dev),
PXA3xx_CKEN("PWMCLK", PWM1, 13000000, 0, &pxa27x_device_pwm1.dev),
PXA3xx_CKEN("MMCCLK", MMC1, 19500000, 0, &pxa_device_mci.dev),
PXA3xx_CKEN("MMCCLK", MMC2, 19500000, 0, &pxa3xx_device_mci2.dev),
};
#ifdef CONFIG_PM
#define ISRAM_START 0x5c000000
#define ISRAM_SIZE SZ_256K
static void __iomem *sram;
static unsigned long wakeup_src;
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
enum { SLEEP_SAVE_CKENA,
SLEEP_SAVE_CKENB,
SLEEP_SAVE_ACCR,
SLEEP_SAVE_COUNT,
};
static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
{
SAVE(CKENA);
SAVE(CKENB);
SAVE(ACCR);
}
static void pxa3xx_cpu_pm_restore(unsigned long *sleep_save)
{
RESTORE(ACCR);
RESTORE(CKENA);
RESTORE(CKENB);
}
/*
* Enter a standby mode (S0D1C2 or S0D2C2). Upon wakeup, the dynamic
* memory controller has to be reinitialised, so we place some code
* in the SRAM to perform this function.
*
* We disable FIQs across the standby - otherwise, we might receive a
* FIQ while the SDRAM is unavailable.
*/
static void pxa3xx_cpu_standby(unsigned int pwrmode)
{
extern const char pm_enter_standby_start[], pm_enter_standby_end[];
void (*fn)(unsigned int) = (void __force *)(sram + 0x8000);
memcpy_toio(sram + 0x8000, pm_enter_standby_start,
pm_enter_standby_end - pm_enter_standby_start);
AD2D0SR = ~0;
AD2D1SR = ~0;
AD2D0ER = wakeup_src;
AD2D1ER = 0;
ASCR = ASCR;
ARSR = ARSR;
local_fiq_disable();
fn(pwrmode);
local_fiq_enable();
AD2D0ER = 0;
AD2D1ER = 0;
}
/*
* NOTE: currently, the OBM (OEM Boot Module) binary comes along with
* PXA3xx development kits assumes that the resuming process continues
* with the address stored within the first 4 bytes of SDRAM. The PSPR
* register is used privately by BootROM and OBM, and _must_ be set to
* 0x5c014000 for the moment.
*/
static void pxa3xx_cpu_pm_suspend(void)
{
volatile unsigned long *p = (volatile void *)0xc0000000;
unsigned long saved_data = *p;
extern void pxa3xx_cpu_suspend(void);
extern void pxa3xx_cpu_resume(void);
/* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
/* clear and setup wakeup source */
AD3SR = ~0;
AD3ER = wakeup_src;
ASCR = ASCR;
ARSR = ARSR;
PCFR |= (1u << 13); /* L1_DIS */
PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */
PSPR = 0x5c014000;
/* overwrite with the resume address */
*p = virt_to_phys(pxa3xx_cpu_resume);
pxa3xx_cpu_suspend();
*p = saved_data;
AD3ER = 0;
}
static void pxa3xx_cpu_pm_enter(suspend_state_t state)
{
/*
* Don't sleep if no wakeup sources are defined
*/
if (wakeup_src == 0) {
printk(KERN_ERR "Not suspending: no wakeup sources\n");
return;
}
switch (state) {
case PM_SUSPEND_STANDBY:
pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2);
break;
case PM_SUSPEND_MEM:
pxa3xx_cpu_pm_suspend();
break;
}
}
static int pxa3xx_cpu_pm_valid(suspend_state_t state)
{
return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
}
static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
.save_count = SLEEP_SAVE_COUNT,
.save = pxa3xx_cpu_pm_save,
.restore = pxa3xx_cpu_pm_restore,
.valid = pxa3xx_cpu_pm_valid,
.enter = pxa3xx_cpu_pm_enter,
};
static void __init pxa3xx_init_pm(void)
{
sram = ioremap(ISRAM_START, ISRAM_SIZE);
if (!sram) {
printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n");
return;
}
/*
* Since we copy wakeup code into the SRAM, we need to ensure
* that it is preserved over the low power modes. Note: bit 8
* is undocumented in the developer manual, but must be set.
*/
AD1R |= ADXR_L2 | ADXR_R0;
AD2R |= ADXR_L2 | ADXR_R0;
AD3R |= ADXR_L2 | ADXR_R0;
/*
* Clear the resume enable registers.
*/
AD1D0ER = 0;
AD2D0ER = 0;
AD2D1ER = 0;
AD3ER = 0;
pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns;
}
static int pxa3xx_set_wake(unsigned int irq, unsigned int on)
{
unsigned long flags, mask = 0;
switch (irq) {
case IRQ_SSP3:
mask = ADXER_MFP_WSSP3;
break;
case IRQ_MSL:
mask = ADXER_WMSL0;
break;
case IRQ_USBH2:
case IRQ_USBH1:
mask = ADXER_WUSBH;
break;
case IRQ_KEYPAD:
mask = ADXER_WKP;
break;
case IRQ_AC97:
mask = ADXER_MFP_WAC97;
break;
case IRQ_USIM:
mask = ADXER_WUSIM0;
break;
case IRQ_SSP2:
mask = ADXER_MFP_WSSP2;
break;
case IRQ_I2C:
mask = ADXER_MFP_WI2C;
break;
case IRQ_STUART:
mask = ADXER_MFP_WUART3;
break;
case IRQ_BTUART:
mask = ADXER_MFP_WUART2;
break;
case IRQ_FFUART:
mask = ADXER_MFP_WUART1;
break;
case IRQ_MMC:
mask = ADXER_MFP_WMMC1;
break;
case IRQ_SSP:
mask = ADXER_MFP_WSSP1;
break;
case IRQ_RTCAlrm:
mask = ADXER_WRTC;
break;
case IRQ_SSP4:
mask = ADXER_MFP_WSSP4;
break;
case IRQ_TSI:
mask = ADXER_WTSI;
break;
case IRQ_USIM2:
mask = ADXER_WUSIM1;
break;
case IRQ_MMC2:
mask = ADXER_MFP_WMMC2;
break;
case IRQ_NAND:
mask = ADXER_MFP_WFLASH;
break;
case IRQ_USB2:
mask = ADXER_WUSB2;
break;
case IRQ_WAKEUP0:
mask = ADXER_WEXTWAKE0;
break;
case IRQ_WAKEUP1:
mask = ADXER_WEXTWAKE1;
break;
case IRQ_MMC3:
mask = ADXER_MFP_GEN12;
break;
default:
return -EINVAL;
}
local_irq_save(flags);
if (on)
wakeup_src |= mask;
else
wakeup_src &= ~mask;
local_irq_restore(flags);
return 0;
}
#else
static inline void pxa3xx_init_pm(void) {}
#define pxa3xx_set_wake NULL
#endif
void __init pxa3xx_init_irq(void)
{
/* enable CP6 access */
u32 value;
__asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
value |= (1 << 6);
__asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
pxa_init_irq(56, pxa3xx_set_wake);
pxa_init_gpio(128, NULL);
}
/*
* device registration specific to PXA3xx.
*/
static struct resource i2c_power_resources[] = {
{
.start = 0x40f500c0,
.end = 0x40f500d3,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_PWRI2C,
.end = IRQ_PWRI2C,
.flags = IORESOURCE_IRQ,
},
};
struct platform_device pxa3xx_device_i2c_power = {
.name = "pxa2xx-i2c",
.id = 1,
.resource = i2c_power_resources,
.num_resources = ARRAY_SIZE(i2c_power_resources),
};
void __init pxa3xx_set_i2c_power_info(struct i2c_pxa_platform_data *info)
{
pxa3xx_device_i2c_power.dev.platform_data = info;
}
static struct platform_device *devices[] __initdata = {
/* &pxa_device_udc, The UDC driver is PXA25x only */
&pxa_device_ffuart,
&pxa_device_btuart,
&pxa_device_stuart,
&pxa_device_i2s,
&pxa_device_rtc,
&pxa27x_device_ssp1,
&pxa27x_device_ssp2,
&pxa27x_device_ssp3,
&pxa3xx_device_ssp4,
&pxa27x_device_pwm0,
&pxa27x_device_pwm1,
&pxa3xx_device_i2c_power,
};
static struct sys_device pxa3xx_sysdev[] = {
{
.cls = &pxa_irq_sysclass,
}, {
.cls = &pxa3xx_mfp_sysclass,
}, {
.cls = &pxa_gpio_sysclass,
},
};
static int __init pxa3xx_init(void)
{
int i, ret = 0;
if (cpu_is_pxa3xx()) {
reset_status = ARSR;
/*
* clear RDH bit every time after reset
*
* Note: the last 3 bits DxS are write-1-to-clear so carefully
* preserve them here in case they will be referenced later
*/
ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks));
if ((ret = pxa_init_dma(32)))
return ret;
pxa3xx_init_pm();
for (i = 0; i < ARRAY_SIZE(pxa3xx_sysdev); i++) {
ret = sysdev_register(&pxa3xx_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(pxa3xx_init);