From: Nick Thompson Date: Thu, 12 Nov 2009 16:03:23 +0000 (-0500) Subject: TI Davinci: add a pin multiplexer configuration API X-Git-Tag: v2010.03-rc1~200^2~23^2~15 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=ca8480d444bdcc1670e42a613c5a5e4e8366d2d9;p=oweals%2Fu-boot.git TI Davinci: add a pin multiplexer configuration API Creates a method allowing pin settings to be logically grouped into data structure arrays and provides an API to configure the pinmux settings to enable the relevant pin functions. Signed-off-by: Nick Thompson --- diff --git a/board/davinci/common/misc.c b/board/davinci/common/misc.c index ffdc20b93a..9fab76fa5d 100644 --- a/board/davinci/common/misc.c +++ b/board/davinci/common/misc.c @@ -1,6 +1,7 @@ /* * Miscelaneous DaVinci functions. * + * Copyright (C) 2009 Nick Thompson, GE Fanuc Ltd, * Copyright (C) 2007 Sergey Kubushyn * Copyright (C) 2008 Lyrtech * Copyright (C) 2004 Texas Instruments. @@ -27,7 +28,8 @@ #include #include #include - +#include +#include "misc.h" DECLARE_GLOBAL_DATA_PTR; @@ -109,3 +111,47 @@ void dv_configure_mac_address(uint8_t *rom_enetaddr) } #endif /* DAVINCI_EMAC */ + +/* + * 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; +} diff --git a/board/davinci/common/misc.h b/board/davinci/common/misc.h index dc3cc41330..f6d8b1bda1 100644 --- a/board/davinci/common/misc.h +++ b/board/davinci/common/misc.h @@ -22,8 +22,20 @@ #ifndef __MISC_H #define __MISC_H +/* pin muxer definitions */ +#define PIN_MUX_NUM_FIELDS 8 /* Per register */ +#define PIN_MUX_FIELD_SIZE 4 /* n in bits */ +#define PIN_MUX_FIELD_MASK ((1 << PIN_MUX_FIELD_SIZE) - 1) + +/* pin definition */ +struct pinmux_config { + dv_reg *mux; /* Address of mux register */ + unsigned char value; /* Value to set in field */ + unsigned char field; /* field number */ +}; int dvevm_read_mac_address(uint8_t *buf); void dv_configure_mac_address(uint8_t *rom_enetaddr); +int davinci_configure_pin_mux(const struct pinmux_config *pins, int n_pins); #endif /* __MISC_H */