// SPDX-License-Identifier: GPL-2.0+ /* * DaVinci pinmux functions. * * Copyright (C) 2009 Nick Thompson, GE Fanuc Ltd, <nick.thompson@gefanuc.com> * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> * Copyright (C) 2008 Lyrtech <www.lyrtech.com> * Copyright (C) 2004 Texas Instruments. */ #include <common.h> #include <asm/arch/hardware.h> #include <asm/io.h> #include <asm/arch/davinci_misc.h> /* * Change the setting of a pin multiplexer field. * * Takes an array of pinmux settings similar to: * * struct pinmux_config uart_pins[] = { * { &davinci_syscfg_regs->pinmux[8], 2, 7 }, * { &davinci_syscfg_regs->pinmux[9], 2, 0 } * }; * * Stepping through the array, each pinmux[n] register has the given value * set in the pin mux field specified. * * The number of pins in the array must be passed (ARRAY_SIZE can provide * this value conveniently). * * Returns 0 if all field numbers and values are in the correct range, * else returns -1. */ int davinci_configure_pin_mux(const struct pinmux_config *pins, const int n_pins) { int i; /* check for invalid pinmux values */ for (i = 0; i < n_pins; i++) { if (pins[i].field >= PIN_MUX_NUM_FIELDS || (pins[i].value & ~PIN_MUX_FIELD_MASK) != 0) return -1; } /* configure the pinmuxes */ for (i = 0; i < n_pins; i++) { const int offset = pins[i].field * PIN_MUX_FIELD_SIZE; const unsigned int value = pins[i].value << offset; const unsigned int mask = PIN_MUX_FIELD_MASK << offset; const dv_reg *mux = pins[i].mux; writel(value | (readl(mux) & (~mask)), mux); } return 0; } /* * Configure multiple pinmux resources. * * Takes an pinmux_resource array of pinmux_config and pin counts: * * const struct pinmux_resource pinmuxes[] = { * PINMUX_ITEM(uart_pins), * PINMUX_ITEM(i2c_pins), * }; * * The number of items in the array must be passed (ARRAY_SIZE can provide * this value conveniently). * * Each item entry is configured in the defined order. If configuration * of any item fails, -1 is returned and none of the following items are * configured. On success, 0 is returned. */ int davinci_configure_pin_mux_items(const struct pinmux_resource *item, const int n_items) { int i; for (i = 0; i < n_items; i++) { if (davinci_configure_pin_mux(item[i].pins, item[i].n_pins) != 0) return -1; } return 0; }