/*
* 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 <asm/hardware.h>
#include <asm/arch/pxa3xx-regs.h>
#include <asm/arch/ohci.h>
#include <asm/arch/pm.h>
#include <asm/arch/dma.h>
#include <asm/arch/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)
/* 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;
}
/*
* 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);
}
/*
* 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;
}
static void clk_pxa3xx_cken_enable(struct clk *clk)
{
unsigned long mask = 1ul << (clk->cken & 0x1f);
local_irq_disable();
if (clk->cken < 32)
CKENA |= mask;
else
CKENB |= mask;
local_irq_enable();
}
static void clk_pxa3xx_cken_disable(struct clk *clk)
{
unsigned long mask = 1ul << (clk->cken & 0x1f);
local_irq_disable();
if (clk->cken < 32)
CKENA &= ~mask;
else
CKENB &= ~mask;
local_irq_enable();
}
static 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,
};
#define PXA3xx_CKEN(_name, _cken, _rate, _delay, _dev) \
{ \
.name = _name, \
.dev = _dev, \
.ops = &clk_pxa3xx_cken_ops, \
.rate = _rate, \
.cken = CKEN_##_cken, \
.delay = _delay, \
}
#define PXA3xx_CK(_name, _cken, _ops, _dev) \
{ \
.name = _name, \
.dev = _dev, \
.ops = _ops, \
.cken = CKEN_##_cken, \
}
static struct clk pxa3xx_clks[] = {
PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_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, &pxa_device_udc.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),
};
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_low();
pxa_init_irq_high();
pxa_init_irq_gpio(128);
}
/*
* device registration specific to PXA3xx.
*/
static struct platform_device *devices[] __initdata = {
&pxa_device_udc,
&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,
};
static int __init pxa3xx_init(void)
{
int ret = 0;
if (cpu_is_pxa3xx()) {
clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks));
if ((ret = pxa_init_dma(32)))
return ret;
return platform_add_devices(devices, ARRAY_SIZE(devices));
}
return 0;
}
subsys_initcall(pxa3xx_init);
