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avr32: Add support for "GPIO" port mux
The "GPIO" port mux is used on AVR32 UC3 parts as well as AT32AP7200 and all later AVR32 chips. This patch adds a driver for it, implementing the same API as the existing portmux-pio driver but with more functionality. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen
parent
d928525795
commit
baf449fc5f
3 changed files with 301 additions and 0 deletions
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@ -35,6 +35,7 @@ COBJS-y += exception.o
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COBJS-y += cache.o
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COBJS-y += interrupts.o
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COBJS-$(CONFIG_PORTMUX_PIO) += portmux-pio.o
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COBJS-$(CONFIG_PORTMUX_GPIO) += portmux-gpio.o
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SRCS := $(START-y:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
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OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
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107
cpu/at32ap/portmux-gpio.c
Normal file
107
cpu/at32ap/portmux-gpio.c
Normal file
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@ -0,0 +1,107 @@
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/*
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* Copyright (C) 2008 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/memory-map.h>
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#include <asm/arch/gpio.h>
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void portmux_select_peripheral(void *port, unsigned long pin_mask,
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enum portmux_function func, unsigned long flags)
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{
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/* Both pull-up and pull-down set means buskeeper */
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if (flags & PORTMUX_PULL_DOWN)
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gpio_writel(port, PDERS, pin_mask);
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else
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gpio_writel(port, PDERC, pin_mask);
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if (flags & PORTMUX_PULL_UP)
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gpio_writel(port, PUERS, pin_mask);
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else
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gpio_writel(port, PUERC, pin_mask);
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/* Select drive strength */
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if (flags & PORTMUX_DRIVE_LOW)
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gpio_writel(port, ODCR0S, pin_mask);
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else
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gpio_writel(port, ODCR0C, pin_mask);
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if (flags & PORTMUX_DRIVE_HIGH)
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gpio_writel(port, ODCR1S, pin_mask);
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else
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gpio_writel(port, ODCR1C, pin_mask);
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/* Select function */
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if (func & PORTMUX_FUNC_B)
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gpio_writel(port, PMR0S, pin_mask);
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else
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gpio_writel(port, PMR0C, pin_mask);
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if (func & PORTMUX_FUNC_C)
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gpio_writel(port, PMR1S, pin_mask);
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else
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gpio_writel(port, PMR1C, pin_mask);
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/* Disable GPIO (i.e. enable peripheral) */
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gpio_writel(port, GPERC, pin_mask);
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}
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void portmux_select_gpio(void *port, unsigned long pin_mask,
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unsigned long flags)
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{
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/* Both pull-up and pull-down set means buskeeper */
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if (flags & PORTMUX_PULL_DOWN)
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gpio_writel(port, PDERS, pin_mask);
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else
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gpio_writel(port, PDERC, pin_mask);
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if (flags & PORTMUX_PULL_UP)
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gpio_writel(port, PUERS, pin_mask);
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else
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gpio_writel(port, PUERC, pin_mask);
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/* Enable open-drain mode if requested */
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if (flags & PORTMUX_OPEN_DRAIN)
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gpio_writel(port, ODMERS, pin_mask);
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else
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gpio_writel(port, ODMERC, pin_mask);
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/* Select drive strength */
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if (flags & PORTMUX_DRIVE_LOW)
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gpio_writel(port, ODCR0S, pin_mask);
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else
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gpio_writel(port, ODCR0C, pin_mask);
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if (flags & PORTMUX_DRIVE_HIGH)
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gpio_writel(port, ODCR1S, pin_mask);
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else
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gpio_writel(port, ODCR1C, pin_mask);
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/* Select direction and initial pin state */
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if (flags & PORTMUX_DIR_OUTPUT) {
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if (flags & PORTMUX_INIT_HIGH)
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gpio_writel(port, OVRS, pin_mask);
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else
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gpio_writel(port, OVRC, pin_mask);
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gpio_writel(port, ODERS, pin_mask);
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} else {
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gpio_writel(port, ODERC, pin_mask);
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}
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/* Enable GPIO */
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gpio_writel(port, GPERS, pin_mask);
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}
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193
include/asm-avr32/arch-common/portmux-gpio.h
Normal file
193
include/asm-avr32/arch-common/portmux-gpio.h
Normal file
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@ -0,0 +1,193 @@
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/*
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* Copyright (C) 2008 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __AVR32_PORTMUX_GPIO_H__
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#define __AVR32_PORTMUX_GPIO_H__
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#include <asm/io.h>
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/* Register offsets */
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struct gpio_regs {
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u32 GPER;
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u32 GPERS;
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u32 GPERC;
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u32 GPERT;
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u32 PMR0;
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u32 PMR0S;
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u32 PMR0C;
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u32 PMR0T;
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u32 PMR1;
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u32 PMR1S;
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u32 PMR1C;
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u32 PMR1T;
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u32 __reserved0[4];
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u32 ODER;
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u32 ODERS;
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u32 ODERC;
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u32 ODERT;
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u32 OVR;
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u32 OVRS;
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u32 OVRC;
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u32 OVRT;
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u32 PVR;
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u32 __reserved_PVRS;
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u32 __reserved_PVRC;
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u32 __reserved_PVRT;
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u32 PUER;
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u32 PUERS;
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u32 PUERC;
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u32 PUERT;
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u32 PDER;
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u32 PDERS;
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u32 PDERC;
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u32 PDERT;
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u32 IER;
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u32 IERS;
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u32 IERC;
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u32 IERT;
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u32 IMR0;
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u32 IMR0S;
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u32 IMR0C;
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u32 IMR0T;
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u32 IMR1;
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u32 IMR1S;
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u32 IMR1C;
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u32 IMR1T;
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u32 GFER;
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u32 GFERS;
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u32 GFERC;
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u32 GFERT;
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u32 IFR;
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u32 __reserved_IFRS;
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u32 IFRC;
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u32 __reserved_IFRT;
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u32 ODMER;
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u32 ODMERS;
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u32 ODMERC;
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u32 ODMERT;
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u32 __reserved1[4];
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u32 ODCR0;
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u32 ODCR0S;
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u32 ODCR0C;
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u32 ODCR0T;
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u32 ODCR1;
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u32 ODCR1S;
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u32 ODCR1C;
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u32 ODCR1T;
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u32 __reserved2[4];
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u32 OSRR0;
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u32 OSRR0S;
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u32 OSRR0C;
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u32 OSRR0T;
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u32 __reserved3[8];
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u32 STER;
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u32 STERS;
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u32 STERC;
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u32 STERT;
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u32 __reserved4[35];
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u32 VERSION;
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};
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/* Register access macros */
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#define gpio_readl(port, reg) \
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__raw_readl(&((struct gpio_regs *)port)->reg)
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#define gpio_writel(gpio, reg, value) \
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__raw_writel(value, &((struct gpio_regs *)port)->reg)
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/* Portmux API starts here. See doc/README.AVR32-port-muxing */
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enum portmux_function {
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PORTMUX_FUNC_A,
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PORTMUX_FUNC_B,
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PORTMUX_FUNC_C,
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PORTMUX_FUNC_D,
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};
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#define PORTMUX_DIR_INPUT (0 << 0)
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#define PORTMUX_DIR_OUTPUT (1 << 0)
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#define PORTMUX_INIT_LOW (0 << 1)
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#define PORTMUX_INIT_HIGH (1 << 1)
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#define PORTMUX_PULL_UP (1 << 2)
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#define PORTMUX_PULL_DOWN (2 << 2)
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#define PORTMUX_BUSKEEPER (3 << 2)
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#define PORTMUX_DRIVE_MIN (0 << 4)
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#define PORTMUX_DRIVE_LOW (1 << 4)
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#define PORTMUX_DRIVE_HIGH (2 << 4)
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#define PORTMUX_DRIVE_MAX (3 << 4)
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#define PORTMUX_OPEN_DRAIN (1 << 6)
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void portmux_select_peripheral(void *port, unsigned long pin_mask,
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enum portmux_function func, unsigned long flags);
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void portmux_select_gpio(void *port, unsigned long pin_mask,
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unsigned long flags);
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/* Internal helper functions */
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static inline void *gpio_pin_to_port(unsigned int pin)
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{
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return (void *)GPIO_BASE + (pin >> 5) * 0x200;
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}
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static inline void __gpio_set_output_value(void *port, unsigned int pin,
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int value)
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{
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if (value)
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gpio_writel(port, OVRS, 1 << pin);
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else
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gpio_writel(port, OVRC, 1 << pin);
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}
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static inline int __gpio_get_input_value(void *port, unsigned int pin)
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{
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return (gpio_readl(port, PVR) >> pin) & 1;
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}
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void gpio_set_output_value(unsigned int pin, int value);
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int gpio_get_input_value(unsigned int pin);
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/* GPIO API starts here */
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/*
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* GCC doesn't realize that the constant case is extremely trivial,
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* so we need to help it make the right decision by using
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* always_inline.
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*/
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__attribute__((always_inline))
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static inline void gpio_set_value(unsigned int pin, int value)
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{
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if (__builtin_constant_p(pin))
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__gpio_set_output_value(gpio_pin_to_port(pin),
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pin & 0x1f, value);
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else
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gpio_set_output_value(pin, value);
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}
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__attribute__((always_inline))
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static inline int gpio_get_value(unsigned int pin)
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{
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if (__builtin_constant_p(pin))
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return __gpio_get_input_value(gpio_pin_to_port(pin),
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pin & 0x1f);
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else
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return gpio_get_input_value(pin);
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}
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#endif /* __AVR32_PORTMUX_GPIO_H__ */
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