1 /* 2 * DaVinci pinmux functions. 3 * 4 * Copyright (C) 2009 Nick Thompson, GE Fanuc Ltd, <nick.thompson@gefanuc.com> 5 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> 6 * Copyright (C) 2008 Lyrtech <www.lyrtech.com> 7 * Copyright (C) 2004 Texas Instruments. 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <asm/arch/hardware.h> 14 #include <asm/io.h> 15 #include <asm/arch/davinci_misc.h> 16 17 /* 18 * Change the setting of a pin multiplexer field. 19 * 20 * Takes an array of pinmux settings similar to: 21 * 22 * struct pinmux_config uart_pins[] = { 23 * { &davinci_syscfg_regs->pinmux[8], 2, 7 }, 24 * { &davinci_syscfg_regs->pinmux[9], 2, 0 } 25 * }; 26 * 27 * Stepping through the array, each pinmux[n] register has the given value 28 * set in the pin mux field specified. 29 * 30 * The number of pins in the array must be passed (ARRAY_SIZE can provide 31 * this value conveniently). 32 * 33 * Returns 0 if all field numbers and values are in the correct range, 34 * else returns -1. 35 */ 36 int davinci_configure_pin_mux(const struct pinmux_config *pins, 37 const int n_pins) 38 { 39 int i; 40 41 /* check for invalid pinmux values */ 42 for (i = 0; i < n_pins; i++) { 43 if (pins[i].field >= PIN_MUX_NUM_FIELDS || 44 (pins[i].value & ~PIN_MUX_FIELD_MASK) != 0) 45 return -1; 46 } 47 48 /* configure the pinmuxes */ 49 for (i = 0; i < n_pins; i++) { 50 const int offset = pins[i].field * PIN_MUX_FIELD_SIZE; 51 const unsigned int value = pins[i].value << offset; 52 const unsigned int mask = PIN_MUX_FIELD_MASK << offset; 53 const dv_reg *mux = pins[i].mux; 54 55 writel(value | (readl(mux) & (~mask)), mux); 56 } 57 58 return 0; 59 } 60 61 /* 62 * Configure multiple pinmux resources. 63 * 64 * Takes an pinmux_resource array of pinmux_config and pin counts: 65 * 66 * const struct pinmux_resource pinmuxes[] = { 67 * PINMUX_ITEM(uart_pins), 68 * PINMUX_ITEM(i2c_pins), 69 * }; 70 * 71 * The number of items in the array must be passed (ARRAY_SIZE can provide 72 * this value conveniently). 73 * 74 * Each item entry is configured in the defined order. If configuration 75 * of any item fails, -1 is returned and none of the following items are 76 * configured. On success, 0 is returned. 77 */ 78 int davinci_configure_pin_mux_items(const struct pinmux_resource *item, 79 const int n_items) 80 { 81 int i; 82 83 for (i = 0; i < n_items; i++) { 84 if (davinci_configure_pin_mux(item[i].pins, 85 item[i].n_pins) != 0) 86 return -1; 87 } 88 89 return 0; 90 } 91