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7d82d89772
We need check the NULL pointer as at91_pio_get_port() may return NULL. Also print a error message when at91_pio_get_port() failed otherwise we cannot notice the failure. Signed-off-by: Josh Wu <josh.wu@atmel.com> Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
397 lines
8.3 KiB
C
397 lines
8.3 KiB
C
/*
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* Copyright (C) 2013 Bo Shen <voice.shen@atmel.com>
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*
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* Copyright (C) 2009 Jens Scharsig (js_at_ng@scharsoft.de)
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*
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* Copyright (C) 2005 HP Labs
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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#include <common.h>
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#include <asm/io.h>
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#include <linux/sizes.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/at91_pio.h>
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#include <asm/arch/gpio.h>
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static struct at91_port *at91_pio_get_port(unsigned port)
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{
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switch (port) {
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case AT91_PIO_PORTA:
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return (struct at91_port *)ATMEL_BASE_PIOA;
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case AT91_PIO_PORTB:
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return (struct at91_port *)ATMEL_BASE_PIOB;
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case AT91_PIO_PORTC:
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return (struct at91_port *)ATMEL_BASE_PIOC;
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#if (ATMEL_PIO_PORTS > 3)
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case AT91_PIO_PORTD:
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return (struct at91_port *)ATMEL_BASE_PIOD;
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#if (ATMEL_PIO_PORTS > 4)
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case AT91_PIO_PORTE:
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return (struct at91_port *)ATMEL_BASE_PIOE;
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#endif
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#endif
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default:
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printf("Error: at91_gpio: Fail to get PIO base!\n");
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return NULL;
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}
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}
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int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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if (use_pullup)
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writel(1 << pin, &at91_port->puer);
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else
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writel(1 << pin, &at91_port->pudr);
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writel(mask, &at91_port->per);
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}
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return 0;
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}
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/*
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* mux the pin to the "GPIO" peripheral role.
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*/
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int at91_set_pio_periph(unsigned port, unsigned pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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at91_set_pio_pullup(port, pin, use_pullup);
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writel(mask, &at91_port->per);
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}
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return 0;
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}
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/*
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* mux the pin to the "A" internal peripheral role.
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*/
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int at91_set_a_periph(unsigned port, unsigned pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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at91_set_pio_pullup(port, pin, use_pullup);
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#if defined(CPU_HAS_PIO3)
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writel(readl(&at91_port->abcdsr1) & ~mask,
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&at91_port->abcdsr1);
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writel(readl(&at91_port->abcdsr2) & ~mask,
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&at91_port->abcdsr2);
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#else
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writel(mask, &at91_port->asr);
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#endif
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writel(mask, &at91_port->pdr);
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}
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return 0;
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}
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/*
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* mux the pin to the "B" internal peripheral role.
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*/
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int at91_set_b_periph(unsigned port, unsigned pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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at91_set_pio_pullup(port, pin, use_pullup);
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#if defined(CPU_HAS_PIO3)
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writel(readl(&at91_port->abcdsr1) | mask,
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&at91_port->abcdsr1);
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writel(readl(&at91_port->abcdsr2) & ~mask,
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&at91_port->abcdsr2);
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#else
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writel(mask, &at91_port->bsr);
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#endif
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writel(mask, &at91_port->pdr);
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}
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return 0;
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}
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#if defined(CPU_HAS_PIO3)
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/*
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* mux the pin to the "C" internal peripheral role.
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*/
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int at91_set_c_periph(unsigned port, unsigned pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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at91_set_pio_pullup(port, pin, use_pullup);
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writel(readl(&at91_port->abcdsr1) & ~mask,
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&at91_port->abcdsr1);
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writel(readl(&at91_port->abcdsr2) | mask,
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&at91_port->abcdsr2);
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writel(mask, &at91_port->pdr);
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}
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return 0;
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}
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/*
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* mux the pin to the "D" internal peripheral role.
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*/
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int at91_set_d_periph(unsigned port, unsigned pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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at91_set_pio_pullup(port, pin, use_pullup);
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writel(readl(&at91_port->abcdsr1) | mask,
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&at91_port->abcdsr1);
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writel(readl(&at91_port->abcdsr2) | mask,
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&at91_port->abcdsr2);
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writel(mask, &at91_port->pdr);
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}
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return 0;
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}
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#endif
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/*
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* mux the pin to the gpio controller (instead of "A" or "B" peripheral), and
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* configure it for an input.
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*/
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int at91_set_pio_input(unsigned port, u32 pin, int use_pullup)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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at91_set_pio_pullup(port, pin, use_pullup);
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writel(mask, &at91_port->odr);
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writel(mask, &at91_port->per);
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}
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return 0;
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}
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/*
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* mux the pin to the gpio controller (instead of "A" or "B" peripheral),
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* and configure it for an output.
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*/
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int at91_set_pio_output(unsigned port, u32 pin, int value)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (port < ATMEL_PIO_PORTS) && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->idr);
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writel(mask, &at91_port->pudr);
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if (value)
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writel(mask, &at91_port->sodr);
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else
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writel(mask, &at91_port->codr);
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writel(mask, &at91_port->oer);
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writel(mask, &at91_port->per);
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}
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return 0;
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}
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/*
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* enable/disable the glitch filter. mostly used with IRQ handling.
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*/
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int at91_set_pio_deglitch(unsigned port, unsigned pin, int is_on)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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if (is_on) {
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#if defined(CPU_HAS_PIO3)
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writel(mask, &at91_port->ifscdr);
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#endif
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writel(mask, &at91_port->ifer);
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} else {
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writel(mask, &at91_port->ifdr);
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}
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}
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return 0;
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}
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#if defined(CPU_HAS_PIO3)
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/*
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* enable/disable the debounce filter.
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*/
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int at91_set_pio_debounce(unsigned port, unsigned pin, int is_on, int div)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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if (is_on) {
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writel(mask, &at91_port->ifscer);
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writel(div & PIO_SCDR_DIV, &at91_port->scdr);
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writel(mask, &at91_port->ifer);
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} else {
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writel(mask, &at91_port->ifdr);
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}
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}
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return 0;
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}
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/*
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* enable/disable the pull-down.
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* If pull-up already enabled while calling the function, we disable it.
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*/
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int at91_set_pio_pulldown(unsigned port, unsigned pin, int is_on)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(mask, &at91_port->pudr);
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if (is_on)
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writel(mask, &at91_port->ppder);
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else
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writel(mask, &at91_port->ppddr);
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}
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return 0;
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}
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/*
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* disable Schmitt trigger
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*/
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int at91_set_pio_disable_schmitt_trig(unsigned port, unsigned pin)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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writel(readl(&at91_port->schmitt) | mask,
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&at91_port->schmitt);
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}
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return 0;
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}
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#endif
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/*
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* enable/disable the multi-driver. This is only valid for output and
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* allows the output pin to run as an open collector output.
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*/
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int at91_set_pio_multi_drive(unsigned port, unsigned pin, int is_on)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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if (is_on)
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writel(mask, &at91_port->mder);
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else
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writel(mask, &at91_port->mddr);
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}
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return 0;
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}
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/*
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* assuming the pin is muxed as a gpio output, set its value.
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*/
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int at91_set_pio_value(unsigned port, unsigned pin, int value)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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if (value)
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writel(mask, &at91_port->sodr);
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else
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writel(mask, &at91_port->codr);
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}
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return 0;
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}
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/*
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* read the pin's value (works even if it's not muxed as a gpio).
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*/
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int at91_get_pio_value(unsigned port, unsigned pin)
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{
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struct at91_port *at91_port = at91_pio_get_port(port);
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u32 pdsr = 0, mask;
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if (at91_port && (pin < 32)) {
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mask = 1 << pin;
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pdsr = readl(&at91_port->pdsr) & mask;
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}
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return pdsr != 0;
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}
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/* Common GPIO API */
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int gpio_request(unsigned gpio, const char *label)
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{
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return 0;
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}
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int gpio_free(unsigned gpio)
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{
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return 0;
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}
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int gpio_direction_input(unsigned gpio)
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{
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at91_set_pio_input(at91_gpio_to_port(gpio),
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at91_gpio_to_pin(gpio), 0);
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return 0;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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at91_set_pio_output(at91_gpio_to_port(gpio),
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at91_gpio_to_pin(gpio), value);
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return 0;
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}
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int gpio_get_value(unsigned gpio)
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{
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return at91_get_pio_value(at91_gpio_to_port(gpio),
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at91_gpio_to_pin(gpio));
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}
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int gpio_set_value(unsigned gpio, int value)
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{
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at91_set_pio_value(at91_gpio_to_port(gpio),
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at91_gpio_to_pin(gpio), value);
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return 0;
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}
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