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/mux.h> 23 #include <mach/common.h> 24 25 /* 26 * Sets the DAVINCI MUX register based on the table 27 */ 28 int __init_or_module davinci_cfg_reg(const unsigned long index) 29 { 30 static DEFINE_SPINLOCK(mux_spin_lock); 31 struct davinci_soc_info *soc_info = &davinci_soc_info; 32 void __iomem *base = soc_info->pinmux_base; 33 unsigned long flags; 34 const struct mux_config *cfg; 35 unsigned int reg_orig = 0, reg = 0; 36 unsigned int mask, warn = 0; 37 38 if (!soc_info->pinmux_pins) 39 BUG(); 40 41 if (index >= soc_info->pinmux_pins_num) { 42 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n", 43 index, soc_info->pinmux_pins_num); 44 dump_stack(); 45 return -ENODEV; 46 } 47 48 cfg = &soc_info->pinmux_pins[index]; 49 50 if (cfg->name == NULL) { 51 printk(KERN_ERR "No entry for the specified index\n"); 52 return -ENODEV; 53 } 54 55 /* Update the mux register in question */ 56 if (cfg->mask) { 57 unsigned tmp1, tmp2; 58 59 spin_lock_irqsave(&mux_spin_lock, flags); 60 reg_orig = __raw_readl(base + cfg->mux_reg); 61 62 mask = (cfg->mask << cfg->mask_offset); 63 tmp1 = reg_orig & mask; 64 reg = reg_orig & ~mask; 65 66 tmp2 = (cfg->mode << cfg->mask_offset); 67 reg |= tmp2; 68 69 if (tmp1 != tmp2) 70 warn = 1; 71 72 __raw_writel(reg, base + cfg->mux_reg); 73 spin_unlock_irqrestore(&mux_spin_lock, flags); 74 } 75 76 if (warn) { 77 #ifdef CONFIG_DAVINCI_MUX_WARNINGS 78 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name); 79 #endif 80 } 81 82 #ifdef CONFIG_DAVINCI_MUX_DEBUG 83 if (cfg->debug || warn) { 84 printk(KERN_WARNING "MUX: Setting register %s\n", cfg->name); 85 printk(KERN_WARNING " %s (0x%08x) = 0x%08x -> 0x%08x\n", 86 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg); 87 } 88 #endif 89 90 return 0; 91 } 92 EXPORT_SYMBOL(davinci_cfg_reg); 93 94 int da8xx_pinmux_setup(const short pins[]) 95 { 96 int i, error = -EINVAL; 97 98 if (pins) 99 for (i = 0; pins[i] >= 0; i++) { 100 error = davinci_cfg_reg(pins[i]); 101 if (error) 102 break; 103 } 104 105 return error; 106 } 107