578 строки
12 KiB
C
578 строки
12 KiB
C
/*
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* linux/arch/arm/mach-pxa/pxa3xx.c
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*
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* code specific to pxa3xx aka Monahans
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*
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* Copyright (C) 2006 Marvell International Ltd.
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*
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* 2007-09-02: eric miao <eric.miao@marvell.com>
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* initial version
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/sysdev.h>
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#include <asm/hardware.h>
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#include <asm/arch/pxa3xx-regs.h>
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#include <asm/arch/ohci.h>
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#include <asm/arch/pm.h>
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#include <asm/arch/dma.h>
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#include <asm/arch/ssp.h>
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#include "generic.h"
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#include "devices.h"
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#include "clock.h"
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/* Crystal clock: 13MHz */
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#define BASE_CLK 13000000
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/* Ring Oscillator Clock: 60MHz */
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#define RO_CLK 60000000
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#define ACCR_D0CS (1 << 26)
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#define ACCR_PCCE (1 << 11)
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/* crystal frequency to static memory controller multiplier (SMCFS) */
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static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
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/* crystal frequency to HSIO bus frequency multiplier (HSS) */
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static unsigned char hss_mult[4] = { 8, 12, 16, 0 };
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/*
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* Get the clock frequency as reflected by CCSR and the turbo flag.
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* We assume these values have been applied via a fcs.
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* If info is not 0 we also display the current settings.
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*/
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unsigned int pxa3xx_get_clk_frequency_khz(int info)
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{
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unsigned long acsr, xclkcfg;
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unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
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/* Read XCLKCFG register turbo bit */
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__asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
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t = xclkcfg & 0x1;
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acsr = ACSR;
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xl = acsr & 0x1f;
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xn = (acsr >> 8) & 0x7;
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hss = (acsr >> 14) & 0x3;
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XL = xl * BASE_CLK;
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XN = xn * XL;
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ro = acsr & ACCR_D0CS;
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CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
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HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
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if (info) {
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pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
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RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
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(ro) ? "" : "in");
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pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
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XL / 1000000, (XL % 1000000) / 10000, xl);
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pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
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XN / 1000000, (XN % 1000000) / 10000, xn,
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(t) ? "" : "in");
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pr_info("HSIO bus clock: %d.%02dMHz\n",
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HSS / 1000000, (HSS % 1000000) / 10000);
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}
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return CLK / 1000;
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}
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/*
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* Return the current static memory controller clock frequency
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* in units of 10kHz
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*/
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unsigned int pxa3xx_get_memclk_frequency_10khz(void)
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{
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unsigned long acsr;
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unsigned int smcfs, clk = 0;
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acsr = ACSR;
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smcfs = (acsr >> 23) & 0x7;
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clk = (acsr & ACCR_D0CS) ? RO_CLK : smcfs_mult[smcfs] * BASE_CLK;
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return (clk / 10000);
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}
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/*
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* Return the current AC97 clock frequency.
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*/
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static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk)
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{
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unsigned long rate = 312000000;
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unsigned long ac97_div;
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ac97_div = AC97_DIV;
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/* This may loose precision for some rates but won't for the
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* standard 24.576MHz.
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*/
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rate /= (ac97_div >> 12) & 0x7fff;
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rate *= (ac97_div & 0xfff);
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return rate;
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}
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/*
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* Return the current HSIO bus clock frequency
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*/
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static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
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{
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unsigned long acsr;
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unsigned int hss, hsio_clk;
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acsr = ACSR;
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hss = (acsr >> 14) & 0x3;
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hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
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return hsio_clk;
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}
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static void clk_pxa3xx_cken_enable(struct clk *clk)
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{
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unsigned long mask = 1ul << (clk->cken & 0x1f);
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if (clk->cken < 32)
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CKENA |= mask;
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else
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CKENB |= mask;
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}
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static void clk_pxa3xx_cken_disable(struct clk *clk)
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{
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unsigned long mask = 1ul << (clk->cken & 0x1f);
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if (clk->cken < 32)
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CKENA &= ~mask;
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else
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CKENB &= ~mask;
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}
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static const struct clkops clk_pxa3xx_cken_ops = {
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.enable = clk_pxa3xx_cken_enable,
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.disable = clk_pxa3xx_cken_disable,
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};
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static const struct clkops clk_pxa3xx_hsio_ops = {
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.enable = clk_pxa3xx_cken_enable,
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.disable = clk_pxa3xx_cken_disable,
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.getrate = clk_pxa3xx_hsio_getrate,
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};
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static const struct clkops clk_pxa3xx_ac97_ops = {
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.enable = clk_pxa3xx_cken_enable,
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.disable = clk_pxa3xx_cken_disable,
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.getrate = clk_pxa3xx_ac97_getrate,
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};
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static void clk_pout_enable(struct clk *clk)
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{
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OSCC |= OSCC_PEN;
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}
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static void clk_pout_disable(struct clk *clk)
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{
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OSCC &= ~OSCC_PEN;
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}
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static const struct clkops clk_pout_ops = {
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.enable = clk_pout_enable,
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.disable = clk_pout_disable,
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};
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#define PXA3xx_CKEN(_name, _cken, _rate, _delay, _dev) \
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{ \
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.name = _name, \
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.dev = _dev, \
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.ops = &clk_pxa3xx_cken_ops, \
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.rate = _rate, \
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.cken = CKEN_##_cken, \
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.delay = _delay, \
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}
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#define PXA3xx_CK(_name, _cken, _ops, _dev) \
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{ \
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.name = _name, \
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.dev = _dev, \
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.ops = _ops, \
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.cken = CKEN_##_cken, \
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}
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static struct clk pxa3xx_clks[] = {
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{
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.name = "CLK_POUT",
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.ops = &clk_pout_ops,
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.rate = 13000000,
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.delay = 70,
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},
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PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev),
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PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL),
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PXA3xx_CK("AC97CLK", AC97, &clk_pxa3xx_ac97_ops, NULL),
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PXA3xx_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
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PXA3xx_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
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PXA3xx_CKEN("UARTCLK", STUART, 14857000, 1, NULL),
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PXA3xx_CKEN("I2CCLK", I2C, 32842000, 0, &pxa_device_i2c.dev),
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PXA3xx_CKEN("UDCCLK", UDC, 48000000, 5, &pxa_device_udc.dev),
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PXA3xx_CKEN("USBCLK", USBH, 48000000, 0, &pxa27x_device_ohci.dev),
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PXA3xx_CKEN("KBDCLK", KEYPAD, 32768, 0, &pxa27x_device_keypad.dev),
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PXA3xx_CKEN("SSPCLK", SSP1, 13000000, 0, &pxa27x_device_ssp1.dev),
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PXA3xx_CKEN("SSPCLK", SSP2, 13000000, 0, &pxa27x_device_ssp2.dev),
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PXA3xx_CKEN("SSPCLK", SSP3, 13000000, 0, &pxa27x_device_ssp3.dev),
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PXA3xx_CKEN("SSPCLK", SSP4, 13000000, 0, &pxa3xx_device_ssp4.dev),
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PXA3xx_CKEN("MMCCLK", MMC1, 19500000, 0, &pxa_device_mci.dev),
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PXA3xx_CKEN("MMCCLK", MMC2, 19500000, 0, &pxa3xx_device_mci2.dev),
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PXA3xx_CKEN("MMCCLK", MMC3, 19500000, 0, &pxa3xx_device_mci3.dev),
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};
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#ifdef CONFIG_PM
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#define ISRAM_START 0x5c000000
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#define ISRAM_SIZE SZ_256K
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static void __iomem *sram;
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static unsigned long wakeup_src;
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#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
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#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
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enum { SLEEP_SAVE_CKENA,
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SLEEP_SAVE_CKENB,
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SLEEP_SAVE_ACCR,
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SLEEP_SAVE_COUNT,
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};
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static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
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{
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SAVE(CKENA);
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SAVE(CKENB);
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SAVE(ACCR);
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}
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static void pxa3xx_cpu_pm_restore(unsigned long *sleep_save)
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{
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RESTORE(ACCR);
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RESTORE(CKENA);
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RESTORE(CKENB);
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}
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/*
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* Enter a standby mode (S0D1C2 or S0D2C2). Upon wakeup, the dynamic
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* memory controller has to be reinitialised, so we place some code
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* in the SRAM to perform this function.
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*
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* We disable FIQs across the standby - otherwise, we might receive a
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* FIQ while the SDRAM is unavailable.
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*/
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static void pxa3xx_cpu_standby(unsigned int pwrmode)
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{
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extern const char pm_enter_standby_start[], pm_enter_standby_end[];
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void (*fn)(unsigned int) = (void __force *)(sram + 0x8000);
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memcpy_toio(sram + 0x8000, pm_enter_standby_start,
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pm_enter_standby_end - pm_enter_standby_start);
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AD2D0SR = ~0;
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AD2D1SR = ~0;
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AD2D0ER = wakeup_src;
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AD2D1ER = 0;
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ASCR = ASCR;
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ARSR = ARSR;
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local_fiq_disable();
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fn(pwrmode);
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local_fiq_enable();
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AD2D0ER = 0;
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AD2D1ER = 0;
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}
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/*
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* NOTE: currently, the OBM (OEM Boot Module) binary comes along with
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* PXA3xx development kits assumes that the resuming process continues
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* with the address stored within the first 4 bytes of SDRAM. The PSPR
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* register is used privately by BootROM and OBM, and _must_ be set to
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* 0x5c014000 for the moment.
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*/
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static void pxa3xx_cpu_pm_suspend(void)
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{
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volatile unsigned long *p = (volatile void *)0xc0000000;
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unsigned long saved_data = *p;
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extern void pxa3xx_cpu_suspend(void);
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extern void pxa3xx_cpu_resume(void);
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/* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
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CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
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CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
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/* clear and setup wakeup source */
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AD3SR = ~0;
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AD3ER = wakeup_src;
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ASCR = ASCR;
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ARSR = ARSR;
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PCFR |= (1u << 13); /* L1_DIS */
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PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */
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PSPR = 0x5c014000;
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/* overwrite with the resume address */
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*p = virt_to_phys(pxa3xx_cpu_resume);
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pxa3xx_cpu_suspend();
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*p = saved_data;
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AD3ER = 0;
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}
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static void pxa3xx_cpu_pm_enter(suspend_state_t state)
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{
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/*
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* Don't sleep if no wakeup sources are defined
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*/
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if (wakeup_src == 0) {
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printk(KERN_ERR "Not suspending: no wakeup sources\n");
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return;
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}
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switch (state) {
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case PM_SUSPEND_STANDBY:
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pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2);
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break;
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case PM_SUSPEND_MEM:
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pxa3xx_cpu_pm_suspend();
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break;
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}
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}
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static int pxa3xx_cpu_pm_valid(suspend_state_t state)
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{
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return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
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}
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static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
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.save_count = SLEEP_SAVE_COUNT,
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.save = pxa3xx_cpu_pm_save,
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.restore = pxa3xx_cpu_pm_restore,
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.valid = pxa3xx_cpu_pm_valid,
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.enter = pxa3xx_cpu_pm_enter,
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};
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static void __init pxa3xx_init_pm(void)
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{
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sram = ioremap(ISRAM_START, ISRAM_SIZE);
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if (!sram) {
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printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n");
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return;
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}
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/*
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* Since we copy wakeup code into the SRAM, we need to ensure
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* that it is preserved over the low power modes. Note: bit 8
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* is undocumented in the developer manual, but must be set.
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*/
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AD1R |= ADXR_L2 | ADXR_R0;
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AD2R |= ADXR_L2 | ADXR_R0;
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AD3R |= ADXR_L2 | ADXR_R0;
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/*
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* Clear the resume enable registers.
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*/
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AD1D0ER = 0;
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AD2D0ER = 0;
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AD2D1ER = 0;
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AD3ER = 0;
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pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns;
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}
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static int pxa3xx_set_wake(unsigned int irq, unsigned int on)
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{
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unsigned long flags, mask = 0;
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switch (irq) {
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case IRQ_SSP3:
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mask = ADXER_MFP_WSSP3;
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break;
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case IRQ_MSL:
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mask = ADXER_WMSL0;
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break;
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case IRQ_USBH2:
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case IRQ_USBH1:
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mask = ADXER_WUSBH;
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break;
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case IRQ_KEYPAD:
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mask = ADXER_WKP;
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break;
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case IRQ_AC97:
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mask = ADXER_MFP_WAC97;
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break;
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case IRQ_USIM:
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mask = ADXER_WUSIM0;
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break;
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case IRQ_SSP2:
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mask = ADXER_MFP_WSSP2;
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break;
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case IRQ_I2C:
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mask = ADXER_MFP_WI2C;
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break;
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case IRQ_STUART:
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mask = ADXER_MFP_WUART3;
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break;
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case IRQ_BTUART:
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mask = ADXER_MFP_WUART2;
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break;
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case IRQ_FFUART:
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mask = ADXER_MFP_WUART1;
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break;
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case IRQ_MMC:
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mask = ADXER_MFP_WMMC1;
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break;
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case IRQ_SSP:
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mask = ADXER_MFP_WSSP1;
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break;
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case IRQ_RTCAlrm:
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mask = ADXER_WRTC;
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break;
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case IRQ_SSP4:
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mask = ADXER_MFP_WSSP4;
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break;
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case IRQ_TSI:
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mask = ADXER_WTSI;
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break;
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case IRQ_USIM2:
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mask = ADXER_WUSIM1;
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break;
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case IRQ_MMC2:
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mask = ADXER_MFP_WMMC2;
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break;
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case IRQ_NAND:
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mask = ADXER_MFP_WFLASH;
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break;
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case IRQ_USB2:
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mask = ADXER_WUSB2;
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break;
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case IRQ_WAKEUP0:
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mask = ADXER_WEXTWAKE0;
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break;
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case IRQ_WAKEUP1:
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mask = ADXER_WEXTWAKE1;
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break;
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case IRQ_MMC3:
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mask = ADXER_MFP_GEN12;
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break;
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default:
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return -EINVAL;
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}
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local_irq_save(flags);
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if (on)
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wakeup_src |= mask;
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else
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wakeup_src &= ~mask;
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local_irq_restore(flags);
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return 0;
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}
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#else
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static inline void pxa3xx_init_pm(void) {}
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#define pxa3xx_set_wake NULL
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#endif
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void __init pxa3xx_init_irq(void)
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{
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/* enable CP6 access */
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u32 value;
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__asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
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value |= (1 << 6);
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__asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
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pxa_init_irq(56, pxa3xx_set_wake);
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pxa_init_gpio(128, NULL);
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}
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/*
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* device registration specific to PXA3xx.
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*/
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static struct platform_device *devices[] __initdata = {
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&pxa_device_udc,
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&pxa_device_ffuart,
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&pxa_device_btuart,
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&pxa_device_stuart,
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&pxa_device_i2s,
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&pxa_device_rtc,
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&pxa27x_device_ssp1,
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&pxa27x_device_ssp2,
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&pxa27x_device_ssp3,
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&pxa3xx_device_ssp4,
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};
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static struct sys_device pxa3xx_sysdev[] = {
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{
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.cls = &pxa_irq_sysclass,
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}, {
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.cls = &pxa3xx_mfp_sysclass,
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}, {
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.cls = &pxa_gpio_sysclass,
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},
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};
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static int __init pxa3xx_init(void)
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{
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int i, ret = 0;
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if (cpu_is_pxa3xx()) {
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/*
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* clear RDH bit every time after reset
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*
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* Note: the last 3 bits DxS are write-1-to-clear so carefully
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* preserve them here in case they will be referenced later
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*/
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ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
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clks_register(pxa3xx_clks, ARRAY_SIZE(pxa3xx_clks));
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if ((ret = pxa_init_dma(32)))
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return ret;
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pxa3xx_init_pm();
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for (i = 0; i < ARRAY_SIZE(pxa3xx_sysdev); i++) {
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ret = sysdev_register(&pxa3xx_sysdev[i]);
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if (ret)
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pr_err("failed to register sysdev[%d]\n", i);
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}
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ret = platform_add_devices(devices, ARRAY_SIZE(devices));
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}
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return ret;
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}
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postcore_initcall(pxa3xx_init);
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