1 /* 2 * Utility to set the DAVINCI MUX register from a table in mux.h 3 * 4 * Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com> 5 * 6 * Based on linux/arch/arm/plat-omap/mux.c: 7 * Copyright (C) 2003 - 2005 Nokia Corporation 8 * 9 * Written by Tony Lindgren 10 * 11 * 2007 (c) MontaVista Software, Inc. This file is licensed under 12 * the terms of the GNU General Public License version 2. This program 13 * is licensed "as is" without any warranty of any kind, whether express 14 * or implied. 15 * 16 * Copyright (C) 2008 Texas Instruments. 17 */ 18 #include <linux/io.h> 19 #include <linux/module.h> 20 #include <linux/spinlock.h> 21 22 #include <mach/hardware.h> 23 #include <mach/mux.h> 24 25 static const struct mux_config *mux_table; 26 static unsigned long pin_table_sz; 27 28 int __init davinci_mux_register(const struct mux_config *pins, 29 unsigned long size) 30 { 31 mux_table = pins; 32 pin_table_sz = size; 33 34 return 0; 35 } 36 37 /* 38 * Sets the DAVINCI MUX register based on the table 39 */ 40 int __init_or_module davinci_cfg_reg(const unsigned long index) 41 { 42 static DEFINE_SPINLOCK(mux_spin_lock); 43 void __iomem *base = IO_ADDRESS(DAVINCI_SYSTEM_MODULE_BASE); 44 unsigned long flags; 45 const struct mux_config *cfg; 46 unsigned int reg_orig = 0, reg = 0; 47 unsigned int mask, warn = 0; 48 49 if (!mux_table) 50 BUG(); 51 52 if (index >= pin_table_sz) { 53 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n", 54 index, pin_table_sz); 55 dump_stack(); 56 return -ENODEV; 57 } 58 59 cfg = &mux_table[index]; 60 61 if (cfg->name == NULL) { 62 printk(KERN_ERR "No entry for the specified index\n"); 63 return -ENODEV; 64 } 65 66 /* Update the mux register in question */ 67 if (cfg->mask) { 68 unsigned tmp1, tmp2; 69 70 spin_lock_irqsave(&mux_spin_lock, flags); 71 reg_orig = __raw_readl(base + cfg->mux_reg); 72 73 mask = (cfg->mask << cfg->mask_offset); 74 tmp1 = reg_orig & mask; 75 reg = reg_orig & ~mask; 76 77 tmp2 = (cfg->mode << cfg->mask_offset); 78 reg |= tmp2; 79 80 if (tmp1 != tmp2) 81 warn = 1; 82 83 __raw_writel(reg, base + cfg->mux_reg); 84 spin_unlock_irqrestore(&mux_spin_lock, flags); 85 } 86 87 if (warn) { 88 #ifdef CONFIG_DAVINCI_MUX_WARNINGS 89 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name); 90 #endif 91 } 92 93 #ifdef CONFIG_DAVINCI_MUX_DEBUG 94 if (cfg->debug || warn) { 95 printk(KERN_WARNING "MUX: Setting register %s\n", cfg->name); 96 printk(KERN_WARNING " %s (0x%08x) = 0x%08x -> 0x%08x\n", 97 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg); 98 } 99 #endif 100 101 return 0; 102 } 103 EXPORT_SYMBOL(davinci_cfg_reg); 104