15ac7afe51
Initially only for 34xx. This code allows us to: - Make the code more generic as the omap internal signal names can stay the same across omap generations for some devices - Map mux registers to GPIO registers that is needed for dynamic muxing of pins during off-idle - Override bootloader mux values via kernel cmdline using omap_mux=some.signa1=0x1234,some.signal2=0x1234 - View and set the mux registers via debugfs if CONFIG_DEBUG_FS is enabled Cc: Mike Rapoport <mike@compulab.co.il> Cc: Benoit Cousson <b-cousson@ti.com> Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/*
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* linux/arch/arm/plat-omap/mux.c
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*
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* Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h
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*
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* Copyright (C) 2003 - 2008 Nokia Corporation
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*
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* Written by Tony Lindgren
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <asm/system.h>
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#include <linux/spinlock.h>
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#include <plat/mux.h>
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#ifdef CONFIG_OMAP_MUX
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static struct omap_mux_cfg *mux_cfg;
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int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg)
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{
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if (!arch_mux_cfg || !arch_mux_cfg->pins || arch_mux_cfg->size == 0
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|| !arch_mux_cfg->cfg_reg) {
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printk(KERN_ERR "Invalid pin table\n");
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return -EINVAL;
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}
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mux_cfg = arch_mux_cfg;
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return 0;
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}
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/*
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* Sets the Omap MUX and PULL_DWN registers based on the table
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*/
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int __init_or_module omap_cfg_reg(const unsigned long index)
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{
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struct pin_config *reg;
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if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
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printk(KERN_ERR "mux: Broken omap_cfg_reg(%lu) entry\n",
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index);
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WARN_ON(1);
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return -EINVAL;
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}
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if (mux_cfg == NULL) {
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printk(KERN_ERR "Pin mux table not initialized\n");
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return -ENODEV;
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}
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if (index >= mux_cfg->size) {
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printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
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index, mux_cfg->size);
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dump_stack();
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return -ENODEV;
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}
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reg = (struct pin_config *)&mux_cfg->pins[index];
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if (!mux_cfg->cfg_reg)
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return -ENODEV;
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return mux_cfg->cfg_reg(reg);
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}
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EXPORT_SYMBOL(omap_cfg_reg);
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#else
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#define omap_mux_init() do {} while(0)
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#define omap_cfg_reg(x) do {} while(0)
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#endif /* CONFIG_OMAP_MUX */
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