376 lines
7.8 KiB
C
376 lines
7.8 KiB
C
/*
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* $Id$
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*
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* ADM5120 GPIO support
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*
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* Copyright (C) 2007 OpenWrt.org
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* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <linux/autoconf.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <asm/addrspace.h>
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#include <asm/gpio.h>
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#include <adm5120_defs.h>
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#include <adm5120_info.h>
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#include <adm5120_switch.h>
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#include <adm5120_irq.h>
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#define GPIO_READ(r) readl((r))
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#define GPIO_WRITE(v, r) writel((v), (r))
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#define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
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struct adm5120_gpio_line {
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u32 flags;
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const char *label;
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int irq;
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};
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#define GPIO_FLAG_VALID 0x01
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#define GPIO_FLAG_USED 0x02
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struct led_desc {
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void __iomem *reg; /* LED register address */
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u8 iv_shift; /* shift amount for input bit */
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u8 mode_shift; /* shift amount for mode bits */
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};
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#define LED_DESC(p, l) { \
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.reg = GPIO_REG(SWITCH_REG_PORT0_LED+((p) * 4)), \
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.iv_shift = LED0_IV_SHIFT + (l), \
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.mode_shift = (l) * 4 \
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}
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static struct led_desc led_table[15] = {
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LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
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LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
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LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
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LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
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LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
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};
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static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT];
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static u32 gpio_conf2;
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/*-------------------------------------------------------------------------*/
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static inline int gpio_is_invalid(unsigned gpio)
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{
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if ((gpio > ADM5120_GPIO_MAX) ||
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(adm5120_gpio_map[gpio].flags & GPIO_FLAG_VALID) == 0)
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return 1;
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return 0;
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}
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static inline int gpio_is_used(unsigned gpio)
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{
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return ((adm5120_gpio_map[gpio].flags & GPIO_FLAG_USED) != 0);
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}
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/*-------------------------------------------------------------------------*/
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/*
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* Helpers for GPIO lines in GPIO_CONF0 register
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*/
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#define PIN_IM(p) ((1 << GPIO_CONF0_IM_SHIFT) << p)
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#define PIN_IV(p) ((1 << GPIO_CONF0_IV_SHIFT) << p)
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#define PIN_OE(p) ((1 << GPIO_CONF0_OE_SHIFT) << p)
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#define PIN_OV(p) ((1 << GPIO_CONF0_OV_SHIFT) << p)
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static inline int pins_direction_input(unsigned pin)
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{
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void __iomem **reg;
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u32 t;
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reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
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t = GPIO_READ(reg);
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t &= ~(PIN_OE(pin));
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t |= PIN_IM(pin);
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GPIO_WRITE(t, reg);
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return 0;
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}
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static inline int pins_direction_output(unsigned pin, int value)
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{
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void __iomem **reg;
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u32 t;
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reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
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t = GPIO_READ(reg);
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t &= ~(PIN_IM(pin) | PIN_OV(pin));
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t |= PIN_OE(pin);
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if (value)
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t |= PIN_OV(pin);
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GPIO_WRITE(t, reg);
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return 0;
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}
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static inline int pins_get_value(unsigned pin)
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{
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void __iomem **reg;
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u32 t;
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reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
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t = GPIO_READ(reg);
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if ((t & PIN_IM(pin)) != 0)
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t &= PIN_IV(pin);
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else
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t &= PIN_OV(pin);
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return (t) ? 1 : 0;
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}
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static inline void pins_set_value(unsigned pin, int value)
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{
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void __iomem **reg;
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u32 t;
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reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
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t = GPIO_READ(reg);
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if (value == 0)
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t &= ~(PIN_OV(pin));
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else
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t |= PIN_OV(pin);
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GPIO_WRITE(t, reg);
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}
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/*
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* Helpers for GPIO lines in PORTx_LED registers
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*/
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static inline int leds_direction_input(unsigned led)
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{
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void __iomem **reg;
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u32 t;
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reg = led_table[led].reg;
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t = GPIO_READ(reg);
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t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
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GPIO_WRITE(t, reg);
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return 0;
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}
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static inline int leds_direction_output(unsigned led, int value)
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{
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void __iomem **reg;
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u32 t, s;
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reg = led_table[led].reg;
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s = led_table[led].mode_shift;
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t = GPIO_READ(reg);
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t &= ~(LED_MODE_MASK << s);
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switch (value) {
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case ADM5120_GPIO_LOW:
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t |= (LED_MODE_OUT_LOW << s);
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break;
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case ADM5120_GPIO_FLASH:
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case ADM5120_GPIO_LINK:
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case ADM5120_GPIO_SPEED:
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case ADM5120_GPIO_DUPLEX:
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case ADM5120_GPIO_ACT:
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case ADM5120_GPIO_COLL:
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case ADM5120_GPIO_LINK_ACT:
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case ADM5120_GPIO_DUPLEX_COLL:
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case ADM5120_GPIO_10M_ACT:
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case ADM5120_GPIO_100M_ACT:
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t |= ((value & LED_MODE_MASK) << s);
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break;
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default:
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t |= (LED_MODE_OUT_HIGH << s);
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break;
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}
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GPIO_WRITE(t, reg);
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return 0;
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}
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static inline int leds_get_value(unsigned led)
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{
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void __iomem **reg;
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u32 t, m;
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reg = led_table[led].reg;
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t = GPIO_READ(reg);
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m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
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if (m == LED_MODE_INPUT)
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return (t >> led_table[led].iv_shift) & 1;
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if (m == LED_MODE_OUT_LOW)
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return 0;
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return 1;
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}
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/*-------------------------------------------------------------------------*/
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/*
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* Main GPIO support routines
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*/
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int adm5120_gpio_direction_input(unsigned gpio)
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{
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if (gpio_is_invalid(gpio))
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return -EINVAL;
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if (gpio < ADM5120_GPIO_P0L0)
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return pins_direction_input(gpio);
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gpio -= ADM5120_GPIO_P0L0;
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return leds_direction_input(gpio);
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}
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EXPORT_SYMBOL(adm5120_gpio_direction_input);
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int adm5120_gpio_direction_output(unsigned gpio, int value)
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{
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if (gpio_is_invalid(gpio))
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return -EINVAL;
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if (gpio < ADM5120_GPIO_P0L0)
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return pins_direction_output(gpio, value);
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gpio -= ADM5120_GPIO_P0L0;
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return leds_direction_output(gpio, value);
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}
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EXPORT_SYMBOL(adm5120_gpio_direction_output);
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int adm5120_gpio_get_value(unsigned gpio)
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{
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if (gpio < ADM5120_GPIO_P0L0)
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return pins_get_value(gpio);
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gpio -= ADM5120_GPIO_P0L0;
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return leds_get_value(gpio);
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}
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EXPORT_SYMBOL(adm5120_gpio_get_value);
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void adm5120_gpio_set_value(unsigned gpio, int value)
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{
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if (gpio < ADM5120_GPIO_P0L0) {
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pins_set_value(gpio, value);
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return;
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}
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gpio -= ADM5120_GPIO_P0L0;
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leds_direction_output(gpio, value);
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}
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EXPORT_SYMBOL(adm5120_gpio_set_value);
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int adm5120_gpio_request(unsigned gpio, const char *label)
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{
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if (gpio_is_invalid(gpio))
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return -EINVAL;
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if (gpio_is_used(gpio))
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return -EBUSY;
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adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
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adm5120_gpio_map[gpio].label = label;
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return 0;
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}
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EXPORT_SYMBOL(adm5120_gpio_request);
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void adm5120_gpio_free(unsigned gpio)
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{
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if (gpio_is_invalid(gpio))
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return;
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adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
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adm5120_gpio_map[gpio].label = NULL;
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}
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EXPORT_SYMBOL(adm5120_gpio_free);
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int adm5120_gpio_to_irq(unsigned gpio)
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{
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if (gpio > ADM5120_GPIO_MAX)
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return -EINVAL;
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return adm5120_gpio_map[gpio].irq;
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}
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EXPORT_SYMBOL(adm5120_gpio_to_irq);
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int adm5120_irq_to_gpio(unsigned irq)
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{
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int i;
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for (i = 0; i < ADM5120_GPIO_COUNT; i++)
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if (adm5120_gpio_map[i].irq == irq)
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return i;
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return -EINVAL;
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}
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EXPORT_SYMBOL(adm5120_irq_to_gpio);
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/*-------------------------------------------------------------------------*/
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void __init adm5120_gpio_csx0_enable(void)
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{
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gpio_conf2 |= GPIO_CONF2_CSX0;
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SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
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adm5120_gpio_map[ADM5120_GPIO_PIN1].flags &= ~GPIO_FLAG_VALID;
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adm5120_gpio_map[ADM5120_GPIO_PIN2].irq = ADM5120_IRQ_GPIO2;
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}
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void __init adm5120_gpio_csx1_enable(void)
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{
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gpio_conf2 |= GPIO_CONF2_CSX1;
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SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
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adm5120_gpio_map[ADM5120_GPIO_PIN3].flags &= ~GPIO_FLAG_VALID;
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if (adm5120_package_bga())
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adm5120_gpio_map[ADM5120_GPIO_PIN4].irq = ADM5120_IRQ_GPIO4;
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}
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void __init adm5120_gpio_ew_enable(void)
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{
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gpio_conf2 |= GPIO_CONF2_EW;
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SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
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adm5120_gpio_map[ADM5120_GPIO_PIN0].flags &= ~GPIO_FLAG_VALID;
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}
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void __init adm5120_gpio_init(void)
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{
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int i;
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gpio_conf2 = 0;
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SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
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for (i = 0; i < ADM5120_GPIO_COUNT; i++)
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adm5120_gpio_map[i].flags = GPIO_FLAG_VALID;
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if (adm5120_package_pqfp()) {
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adm5120_gpio_map[ADM5120_GPIO_PIN4].flags &= ~GPIO_FLAG_VALID;
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adm5120_gpio_map[ADM5120_GPIO_PIN5].flags &= ~GPIO_FLAG_VALID;
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adm5120_gpio_map[ADM5120_GPIO_PIN6].flags &= ~GPIO_FLAG_VALID;
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adm5120_gpio_map[ADM5120_GPIO_PIN7].flags &= ~GPIO_FLAG_VALID;
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}
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}
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