117 строки
2.5 KiB
C
117 строки
2.5 KiB
C
/*
|
|
* Utility to set the DAVINCI MUX register from a table in mux.h
|
|
*
|
|
* Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
|
|
*
|
|
* Based on linux/arch/arm/plat-omap/mux.c:
|
|
* Copyright (C) 2003 - 2005 Nokia Corporation
|
|
*
|
|
* Written by Tony Lindgren
|
|
*
|
|
* 2007 (c) MontaVista Software, Inc. This file is licensed under
|
|
* the terms of the GNU General Public License version 2. This program
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
* or implied.
|
|
*
|
|
* Copyright (C) 2008 Texas Instruments.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <mach/mux.h>
|
|
#include <mach/common.h>
|
|
|
|
static void __iomem *pinmux_base;
|
|
|
|
/*
|
|
* Sets the DAVINCI MUX register based on the table
|
|
*/
|
|
int davinci_cfg_reg(const unsigned long index)
|
|
{
|
|
static DEFINE_SPINLOCK(mux_spin_lock);
|
|
struct davinci_soc_info *soc_info = &davinci_soc_info;
|
|
unsigned long flags;
|
|
const struct mux_config *cfg;
|
|
unsigned int reg_orig = 0, reg = 0;
|
|
unsigned int mask, warn = 0;
|
|
|
|
if (WARN_ON(!soc_info->pinmux_pins))
|
|
return -ENODEV;
|
|
|
|
if (!pinmux_base) {
|
|
pinmux_base = ioremap(soc_info->pinmux_base, SZ_4K);
|
|
if (WARN_ON(!pinmux_base))
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (index >= soc_info->pinmux_pins_num) {
|
|
pr_err("Invalid pin mux index: %lu (%lu)\n",
|
|
index, soc_info->pinmux_pins_num);
|
|
dump_stack();
|
|
return -ENODEV;
|
|
}
|
|
|
|
cfg = &soc_info->pinmux_pins[index];
|
|
|
|
if (cfg->name == NULL) {
|
|
pr_err("No entry for the specified index\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Update the mux register in question */
|
|
if (cfg->mask) {
|
|
unsigned tmp1, tmp2;
|
|
|
|
spin_lock_irqsave(&mux_spin_lock, flags);
|
|
reg_orig = __raw_readl(pinmux_base + cfg->mux_reg);
|
|
|
|
mask = (cfg->mask << cfg->mask_offset);
|
|
tmp1 = reg_orig & mask;
|
|
reg = reg_orig & ~mask;
|
|
|
|
tmp2 = (cfg->mode << cfg->mask_offset);
|
|
reg |= tmp2;
|
|
|
|
if (tmp1 != tmp2)
|
|
warn = 1;
|
|
|
|
__raw_writel(reg, pinmux_base + cfg->mux_reg);
|
|
spin_unlock_irqrestore(&mux_spin_lock, flags);
|
|
}
|
|
|
|
if (warn) {
|
|
#ifdef CONFIG_DAVINCI_MUX_WARNINGS
|
|
pr_warn("initialized %s\n", cfg->name);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_DAVINCI_MUX_DEBUG
|
|
if (cfg->debug || warn) {
|
|
pr_warn("Setting register %s\n", cfg->name);
|
|
pr_warn(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
|
|
cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(davinci_cfg_reg);
|
|
|
|
int davinci_cfg_reg_list(const short pins[])
|
|
{
|
|
int i, error = -EINVAL;
|
|
|
|
if (pins)
|
|
for (i = 0; pins[i] >= 0; i++) {
|
|
error = davinci_cfg_reg(pins[i]);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|