+++ /dev/null
-/*
- * Code ported from Nomadik GPIO driver in ST-Ericsson Linux kernel code.
- * The purpose is that GPIO config found in kernel should work by simply
- * copy-paste it to U-Boot.
- *
- * Original Linux authors:
- * Copyright (C) 2008,2009 STMicroelectronics
- * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
- * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
- *
- * Ported to U-Boot by:
- * Copyright (C) 2010 Joakim Axelsson <joakim.axelsson AT stericsson.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <common.h>
-#include <asm/io.h>
-
-#include <asm/arch/db8500_gpio.h>
-#include <asm/arch/db8500_pincfg.h>
-#include <linux/compiler.h>
-
-#define IO_ADDR(x) (void *) (x)
-
-/*
- * The GPIO module in the db8500 Systems-on-Chip is an
- * AMBA device, managing 32 pins and alternate functions. The logic block
- * is currently only used in the db8500.
- */
-
-#define GPIO_TOTAL_PINS 268
-#define GPIO_PINS_PER_BLOCK 32
-#define GPIO_BLOCKS_COUNT (GPIO_TOTAL_PINS/GPIO_PINS_PER_BLOCK + 1)
-#define GPIO_BLOCK(pin) (((pin + GPIO_PINS_PER_BLOCK) >> 5) - 1)
-#define GPIO_PIN_WITHIN_BLOCK(pin) ((pin)%(GPIO_PINS_PER_BLOCK))
-
-/* Register in the logic block */
-#define DB8500_GPIO_DAT 0x00
-#define DB8500_GPIO_DATS 0x04
-#define DB8500_GPIO_DATC 0x08
-#define DB8500_GPIO_PDIS 0x0c
-#define DB8500_GPIO_DIR 0x10
-#define DB8500_GPIO_DIRS 0x14
-#define DB8500_GPIO_DIRC 0x18
-#define DB8500_GPIO_SLPC 0x1c
-#define DB8500_GPIO_AFSLA 0x20
-#define DB8500_GPIO_AFSLB 0x24
-
-#define DB8500_GPIO_RIMSC 0x40
-#define DB8500_GPIO_FIMSC 0x44
-#define DB8500_GPIO_IS 0x48
-#define DB8500_GPIO_IC 0x4c
-#define DB8500_GPIO_RWIMSC 0x50
-#define DB8500_GPIO_FWIMSC 0x54
-#define DB8500_GPIO_WKS 0x58
-
-static void __iomem *get_gpio_addr(unsigned gpio)
-{
- /* Our list of GPIO chips */
- static void __iomem *gpio_addrs[GPIO_BLOCKS_COUNT] = {
- IO_ADDR(CFG_GPIO_0_BASE),
- IO_ADDR(CFG_GPIO_1_BASE),
- IO_ADDR(CFG_GPIO_2_BASE),
- IO_ADDR(CFG_GPIO_3_BASE),
- IO_ADDR(CFG_GPIO_4_BASE),
- IO_ADDR(CFG_GPIO_5_BASE),
- IO_ADDR(CFG_GPIO_6_BASE),
- IO_ADDR(CFG_GPIO_7_BASE),
- IO_ADDR(CFG_GPIO_8_BASE)
- };
-
- return gpio_addrs[GPIO_BLOCK(gpio)];
-}
-
-static unsigned get_gpio_offset(unsigned gpio)
-{
- return GPIO_PIN_WITHIN_BLOCK(gpio);
-}
-
-/* Can only be called from config_pin. Don't configure alt-mode directly */
-static void gpio_set_mode(unsigned gpio, enum db8500_gpio_alt mode)
-{
- void __iomem *addr = get_gpio_addr(gpio);
- unsigned offset = get_gpio_offset(gpio);
- u32 bit = 1 << offset;
- u32 afunc, bfunc;
-
- afunc = readl(addr + DB8500_GPIO_AFSLA) & ~bit;
- bfunc = readl(addr + DB8500_GPIO_AFSLB) & ~bit;
- if (mode & DB8500_GPIO_ALT_A)
- afunc |= bit;
- if (mode & DB8500_GPIO_ALT_B)
- bfunc |= bit;
- writel(afunc, addr + DB8500_GPIO_AFSLA);
- writel(bfunc, addr + DB8500_GPIO_AFSLB);
-}
-
-/**
- * db8500_gpio_set_pull() - enable/disable pull up/down on a gpio
- * @gpio: pin number
- * @pull: one of DB8500_GPIO_PULL_DOWN, DB8500_GPIO_PULL_UP,
- * and DB8500_GPIO_PULL_NONE
- *
- * Enables/disables pull up/down on a specified pin. This only takes effect if
- * the pin is configured as an input (either explicitly or by the alternate
- * function).
- *
- * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
- * configured as an input. Otherwise, due to the way the controller registers
- * work, this function will change the value output on the pin.
- */
-void db8500_gpio_set_pull(unsigned gpio, enum db8500_gpio_pull pull)
-{
- void __iomem *addr = get_gpio_addr(gpio);
- unsigned offset = get_gpio_offset(gpio);
- u32 bit = 1 << offset;
- u32 pdis;
-
- pdis = readl(addr + DB8500_GPIO_PDIS);
- if (pull == DB8500_GPIO_PULL_NONE)
- pdis |= bit;
- else
- pdis &= ~bit;
- writel(pdis, addr + DB8500_GPIO_PDIS);
-
- if (pull == DB8500_GPIO_PULL_UP)
- writel(bit, addr + DB8500_GPIO_DATS);
- else if (pull == DB8500_GPIO_PULL_DOWN)
- writel(bit, addr + DB8500_GPIO_DATC);
-}
-
-void db8500_gpio_make_input(unsigned gpio)
-{
- void __iomem *addr = get_gpio_addr(gpio);
- unsigned offset = get_gpio_offset(gpio);
-
- writel(1 << offset, addr + DB8500_GPIO_DIRC);
-}
-
-int db8500_gpio_get_input(unsigned gpio)
-{
- void __iomem *addr = get_gpio_addr(gpio);
- unsigned offset = get_gpio_offset(gpio);
- u32 bit = 1 << offset;
-
- printf("db8500_gpio_get_input gpio=%u addr=%p offset=%u bit=%#x\n",
- gpio, addr, offset, bit);
-
- return (readl(addr + DB8500_GPIO_DAT) & bit) != 0;
-}
-
-void db8500_gpio_make_output(unsigned gpio, int val)
-{
- void __iomem *addr = get_gpio_addr(gpio);
- unsigned offset = get_gpio_offset(gpio);
-
- writel(1 << offset, addr + DB8500_GPIO_DIRS);
- db8500_gpio_set_output(gpio, val);
-}
-
-void db8500_gpio_set_output(unsigned gpio, int val)
-{
- void __iomem *addr = get_gpio_addr(gpio);
- unsigned offset = get_gpio_offset(gpio);
-
- if (val)
- writel(1 << offset, addr + DB8500_GPIO_DATS);
- else
- writel(1 << offset, addr + DB8500_GPIO_DATC);
-}
-
-/**
- * config_pin - configure a pin's mux attributes
- * @cfg: pin configuration
- *
- * Configures a pin's mode (alternate function or GPIO), its pull up status,
- * and its sleep mode based on the specified configuration. The @cfg is
- * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
- * are constructed using, and can be further enhanced with, the macros in
- * plat/pincfg.h.
- *
- * If a pin's mode is set to GPIO, it is configured as an input to avoid
- * side-effects. The gpio can be manipulated later using standard GPIO API
- * calls.
- */
-static void config_pin(unsigned long cfg)
-{
- int pin = PIN_NUM(cfg);
- int pull = PIN_PULL(cfg);
- int af = PIN_ALT(cfg);
- int output = PIN_DIR(cfg);
- int val = PIN_VAL(cfg);
-
- if (output)
- db8500_gpio_make_output(pin, val);
- else {
- db8500_gpio_make_input(pin);
- db8500_gpio_set_pull(pin, pull);
- }
-
- gpio_set_mode(pin, af);
-}
-
-/**
- * db8500_config_pins - configure several pins at once
- * @cfgs: array of pin configurations
- * @num: number of elments in the array
- *
- * Configures several pins using config_pin(). Refer to that function for
- * further information.
- */
-void db8500_gpio_config_pins(unsigned long *cfgs, size_t num)
-{
- size_t i;
-
- for (i = 0; i < num; i++)
- config_pin(cfgs[i]);
-}
projects / platform / kernel / u-boot.git / commitdiff