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dec85a9516
With the board file support gone, and the platform using DT only, a lot of the remaining code is no longer referenced and can be removed. Technically, the DT file only references DA850, but since that is very similar to DA830, I'm leaving the latter. Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Utility to set the DAVINCI MUX register from a table in mux.h
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*
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* Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
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*
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* Based on linux/arch/arm/plat-omap/mux.c:
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* Copyright (C) 2003 - 2005 Nokia Corporation
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*
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* Written by Tony Lindgren
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*
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* 2007 (c) MontaVista Software, Inc.
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*
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* Copyright (C) 2008 Texas Instruments.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include "mux.h"
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#include "common.h"
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static void __iomem *pinmux_base;
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/*
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* Sets the DAVINCI MUX register based on the table
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*/
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int davinci_cfg_reg(const unsigned long index)
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{
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static DEFINE_SPINLOCK(mux_spin_lock);
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struct davinci_soc_info *soc_info = &davinci_soc_info;
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unsigned long flags;
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const struct mux_config *cfg;
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unsigned int reg_orig = 0, reg = 0;
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unsigned int mask, warn = 0;
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if (WARN_ON(!soc_info->pinmux_pins))
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return -ENODEV;
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if (!pinmux_base) {
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pinmux_base = ioremap(soc_info->pinmux_base, SZ_4K);
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if (WARN_ON(!pinmux_base))
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return -ENOMEM;
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}
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if (index >= soc_info->pinmux_pins_num) {
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pr_err("Invalid pin mux index: %lu (%lu)\n",
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index, soc_info->pinmux_pins_num);
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dump_stack();
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return -ENODEV;
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}
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cfg = &soc_info->pinmux_pins[index];
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if (cfg->name == NULL) {
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pr_err("No entry for the specified index\n");
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return -ENODEV;
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}
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/* Update the mux register in question */
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if (cfg->mask) {
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unsigned tmp1, tmp2;
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spin_lock_irqsave(&mux_spin_lock, flags);
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reg_orig = __raw_readl(pinmux_base + cfg->mux_reg);
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mask = (cfg->mask << cfg->mask_offset);
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tmp1 = reg_orig & mask;
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reg = reg_orig & ~mask;
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tmp2 = (cfg->mode << cfg->mask_offset);
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reg |= tmp2;
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if (tmp1 != tmp2)
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warn = 1;
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__raw_writel(reg, pinmux_base + cfg->mux_reg);
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spin_unlock_irqrestore(&mux_spin_lock, flags);
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}
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if (warn) {
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#ifdef CONFIG_DAVINCI_MUX_WARNINGS
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pr_warn("initialized %s\n", cfg->name);
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#endif
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}
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#ifdef CONFIG_DAVINCI_MUX_DEBUG
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if (cfg->debug || warn) {
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pr_warn("Setting register %s\n", cfg->name);
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pr_warn(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
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cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
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}
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#endif
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return 0;
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}
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