256 строки
6.0 KiB
C
256 строки
6.0 KiB
C
/*
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* linux/arch/arm/mach-pxa/mfp.c
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*
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* PXA3xx Multi-Function Pin Support
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*
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* Copyright (C) 2007 Marvell Internation Ltd.
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*
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* 2007-08-21: 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/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/mfp.h>
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#include <asm/arch/mfp-pxa3xx.h>
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#include <asm/arch/pxa3xx-regs.h>
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/* mfp_spin_lock is used to ensure that MFP register configuration
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* (most likely a read-modify-write operation) is atomic, and that
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* mfp_table[] is consistent
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*/
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static DEFINE_SPINLOCK(mfp_spin_lock);
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static void __iomem *mfpr_mmio_base = (void __iomem *)&__REG(MFPR_BASE);
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struct pxa3xx_mfp_pin {
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unsigned long config; /* -1 for not configured */
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unsigned long mfpr_off; /* MFPRxx Register offset */
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unsigned long mfpr_run; /* Run-Mode Register Value */
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unsigned long mfpr_lpm; /* Low Power Mode Register Value */
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};
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static struct pxa3xx_mfp_pin mfp_table[MFP_PIN_MAX];
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/* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */
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static const unsigned long mfpr_lpm[] = {
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MFPR_LPM_INPUT,
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MFPR_LPM_DRIVE_LOW,
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MFPR_LPM_DRIVE_HIGH,
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MFPR_LPM_PULL_LOW,
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MFPR_LPM_PULL_HIGH,
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MFPR_LPM_FLOAT,
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};
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/* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */
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static const unsigned long mfpr_pull[] = {
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MFPR_PULL_NONE,
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MFPR_PULL_LOW,
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MFPR_PULL_HIGH,
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MFPR_PULL_BOTH,
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};
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/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */
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static const unsigned long mfpr_edge[] = {
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MFPR_EDGE_NONE,
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MFPR_EDGE_RISE,
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MFPR_EDGE_FALL,
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MFPR_EDGE_BOTH,
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};
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#define mfpr_readl(off) \
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__raw_readl(mfpr_mmio_base + (off))
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#define mfpr_writel(off, val) \
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__raw_writel(val, mfpr_mmio_base + (off))
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#define mfp_configured(p) ((p)->config != -1)
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/*
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* perform a read-back of any MFPR register to make sure the
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* previous writings are finished
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*/
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#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + 0)
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static inline void __mfp_config_run(struct pxa3xx_mfp_pin *p)
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{
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if (mfp_configured(p))
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mfpr_writel(p->mfpr_off, p->mfpr_run);
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}
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static inline void __mfp_config_lpm(struct pxa3xx_mfp_pin *p)
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{
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if (mfp_configured(p)) {
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unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR;
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if (mfpr_clr != p->mfpr_run)
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mfpr_writel(p->mfpr_off, mfpr_clr);
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if (p->mfpr_lpm != mfpr_clr)
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mfpr_writel(p->mfpr_off, p->mfpr_lpm);
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}
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}
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void pxa3xx_mfp_config(unsigned long *mfp_cfgs, int num)
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{
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unsigned long flags;
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int i;
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spin_lock_irqsave(&mfp_spin_lock, flags);
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for (i = 0; i < num; i++, mfp_cfgs++) {
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unsigned long tmp, c = *mfp_cfgs;
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struct pxa3xx_mfp_pin *p;
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int pin, af, drv, lpm, edge, pull;
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pin = MFP_PIN(c);
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BUG_ON(pin >= MFP_PIN_MAX);
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p = &mfp_table[pin];
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af = MFP_AF(c);
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drv = MFP_DS(c);
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lpm = MFP_LPM_STATE(c);
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edge = MFP_LPM_EDGE(c);
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pull = MFP_PULL(c);
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/* run-mode pull settings will conflict with MFPR bits of
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* low power mode state, calculate mfpr_run and mfpr_lpm
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* individually if pull != MFP_PULL_NONE
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*/
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tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv);
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if (likely(pull == MFP_PULL_NONE)) {
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p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge];
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p->mfpr_lpm = p->mfpr_run;
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} else {
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p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge];
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p->mfpr_run = tmp | mfpr_pull[pull];
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}
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p->config = c; __mfp_config_run(p);
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}
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mfpr_sync();
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spin_unlock_irqrestore(&mfp_spin_lock, flags);
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}
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unsigned long pxa3xx_mfp_read(int mfp)
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{
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unsigned long val, flags;
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BUG_ON(mfp >= MFP_PIN_MAX);
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spin_lock_irqsave(&mfp_spin_lock, flags);
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val = mfpr_readl(mfp_table[mfp].mfpr_off);
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spin_unlock_irqrestore(&mfp_spin_lock, flags);
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return val;
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}
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void pxa3xx_mfp_write(int mfp, unsigned long val)
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{
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unsigned long flags;
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BUG_ON(mfp >= MFP_PIN_MAX);
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spin_lock_irqsave(&mfp_spin_lock, flags);
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mfpr_writel(mfp_table[mfp].mfpr_off, val);
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mfpr_sync();
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spin_unlock_irqrestore(&mfp_spin_lock, flags);
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}
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void __init pxa3xx_mfp_init_addr(struct pxa3xx_mfp_addr_map *map)
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{
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struct pxa3xx_mfp_addr_map *p;
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unsigned long offset, flags;
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int i;
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spin_lock_irqsave(&mfp_spin_lock, flags);
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for (p = map; p->start != MFP_PIN_INVALID; p++) {
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offset = p->offset;
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i = p->start;
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do {
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mfp_table[i].mfpr_off = offset;
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mfp_table[i].mfpr_run = 0;
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mfp_table[i].mfpr_lpm = 0;
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offset += 4; i++;
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} while ((i <= p->end) && (p->end != -1));
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}
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spin_unlock_irqrestore(&mfp_spin_lock, flags);
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}
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void __init pxa3xx_init_mfp(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mfp_table); i++)
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mfp_table[i].config = -1;
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}
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#ifdef CONFIG_PM
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/*
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* Configure the MFPs appropriately for suspend/resume.
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* FIXME: this should probably depend on which system state we're
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* entering - for instance, we might not want to place MFP pins in
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* a pull-down mode if they're an active low chip select, and we're
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* just entering standby.
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*/
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static int pxa3xx_mfp_suspend(struct sys_device *d, pm_message_t state)
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{
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int pin;
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for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++) {
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struct pxa3xx_mfp_pin *p = &mfp_table[pin];
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__mfp_config_lpm(p);
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}
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return 0;
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}
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static int pxa3xx_mfp_resume(struct sys_device *d)
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{
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int pin;
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for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++) {
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struct pxa3xx_mfp_pin *p = &mfp_table[pin];
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__mfp_config_run(p);
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}
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/* clear RDH bit when MFP settings are restored
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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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return 0;
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}
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#else
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#define pxa3xx_mfp_suspend NULL
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#define pxa3xx_mfp_resume NULL
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#endif
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struct sysdev_class pxa3xx_mfp_sysclass = {
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.name = "mfp",
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.suspend = pxa3xx_mfp_suspend,
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.resume = pxa3xx_mfp_resume,
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};
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static int __init mfp_init_devicefs(void)
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{
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if (cpu_is_pxa3xx())
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return sysdev_class_register(&pxa3xx_mfp_sysclass);
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return 0;
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}
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postcore_initcall(mfp_init_devicefs);
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