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 #include <mach/common.h> 25 26 /* 27 * Sets the DAVINCI MUX register based on the table 28 */ 29 int __init_or_module davinci_cfg_reg(const unsigned long index) 30 { 31 static DEFINE_SPINLOCK(mux_spin_lock); 32 struct davinci_soc_info *soc_info = &davinci_soc_info; 33 void __iomem *base = soc_info->pinmux_base; 34 unsigned long flags; 35 const struct mux_config *cfg; 36 unsigned int reg_orig = 0, reg = 0; 37 unsigned int mask, warn = 0; 38 39 if (!soc_info->pinmux_pins) 40 BUG(); 41 42 if (index >= soc_info->pinmux_pins_num) { 43 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n", 44 index, soc_info->pinmux_pins_num); 45 dump_stack(); 46 return -ENODEV; 47 } 48 49 cfg = &soc_info->pinmux_pins[index]; 50 51 if (cfg->name == NULL) { 52 printk(KERN_ERR "No entry for the specified index\n"); 53 return -ENODEV; 54 } 55 56 /* Update the mux register in question */ 57 if (cfg->mask) { 58 unsigned tmp1, tmp2; 59 60 spin_lock_irqsave(&mux_spin_lock, flags); 61 reg_orig = __raw_readl(base + cfg->mux_reg); 62 63 mask = (cfg->mask << cfg->mask_offset); 64 tmp1 = reg_orig & mask; 65 reg = reg_orig & ~mask; 66 67 tmp2 = (cfg->mode << cfg->mask_offset); 68 reg |= tmp2; 69 70 if (tmp1 != tmp2) 71 warn = 1; 72 73 __raw_writel(reg, base + cfg->mux_reg); 74 spin_unlock_irqrestore(&mux_spin_lock, flags); 75 } 76 77 if (warn) { 78 #ifdef CONFIG_DAVINCI_MUX_WARNINGS 79 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name); 80 #endif 81 } 82 83 #ifdef CONFIG_DAVINCI_MUX_DEBUG 84 if (cfg->debug || warn) { 85 printk(KERN_WARNING "MUX: Setting register %s\n", cfg->name); 86 printk(KERN_WARNING " %s (0x%08x) = 0x%08x -> 0x%08x\n", 87 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg); 88 } 89 #endif 90 91 return 0; 92 } 93 EXPORT_SYMBOL(davinci_cfg_reg); 94 95 int da8xx_pinmux_setup(const short pins[]) 96 { 97 int i, error = -EINVAL; 98 99 if (pins) 100 for (i = 0; pins[i] >= 0; i++) { 101 error = davinci_cfg_reg(pins[i]); 102 if (error) 103 break; 104 } 105 106 return error; 107 } 108