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