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/*
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* Copyright (C) 2007 Apple Inc. All rights reserved.
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#include <debug.h>
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#include <drivers/spi.h>
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#include <platform.h>
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#include <platform/gpio.h>
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#include <platform/soc/hwregbase.h>
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#include "gpio.h"
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#if WITH_TARGET_CONFIG
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# include <target/pinconfig.h>
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#else
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# include <platform/pinconfig.h>
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#endif
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u_int32_t gpio_read(gpio_t gpio)
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{
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int pad = GPIO2PAD(gpio);
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int pin = GPIO2PIN(gpio);
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#if WITH_HW_SPI && defined(GPIO_PAD_SPI)
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if (pad == GPIO_PAD_SPI) return spi_gpio_read(pin);
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#endif
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return (rPDATn(pad) & (1<<pin)) ? 1UL : 0UL;
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}
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void gpio_write(gpio_t gpio, u_int32_t val)
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{
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int pad = GPIO2PAD(gpio);
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int pin = GPIO2PIN(gpio);
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#if WITH_HW_SPI && defined(GPIO_PAD_SPI)
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if (pad == GPIO_PAD_SPI) {
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spi_gpio_write(pin, val);
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return;
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}
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#endif
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rFSEL = (pad << 16) | (pin << 8) | (val ? PCON_OUT_1 : PCON_OUT_0);
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}
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static const int gpio_config_map[GPIO_CFG_MAX] = {
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[GPIO_CFG_IN] = PCON_IN,
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[GPIO_CFG_OUT] = PCON_OUT,
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[GPIO_CFG_OUT_0] = PCON_OUT_0,
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[GPIO_CFG_OUT_1] = PCON_OUT_1,
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[GPIO_CFG_FUNC(0)] = PCON_FUNC2,
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[GPIO_CFG_FUNC(1)] = PCON_FUNC3,
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[GPIO_CFG_FUNC(2)] = PCON_FUNC4,
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[GPIO_CFG_FUNC(3)] = PCON_FUNC5
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};
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void gpio_configure(gpio_t gpio, u_int32_t config)
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{
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int pad = GPIO2PAD(gpio);
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int pin = GPIO2PIN(gpio);
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int func;
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#if WITH_HW_SPI && defined(GPIO_PAD_SPI)
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if (pad == GPIO_PAD_SPI) {
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spi_gpio_configure(pin, config);
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return;
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}
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#endif
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if (config > GPIO_CFG_MAX) return;
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if (config == GPIO_CFG_DFLT) {
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func = (gpio_default_config[pad].pcon >> (pin * 4)) & 0xF;
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} else {
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func = gpio_config_map[config];
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}
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if (func == PCON_DISABLE) {
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rPPIEn(pad) &= ~(1 << pin);
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rFSEL = (pad << 16) | (pin << 8) | PCON_IN;
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} else {
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rFSEL = (pad << 16) | (pin << 8) | func;
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rPPIEn(pad) |= (1 << pin);
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}
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/* Once we reconfigure, reset the pullup/pulldown to default. This could cause
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a glitch on outputs, but will avoid spurious transitions on inputs. We're
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between a rock and a hard place because of the GPIO block's design. */
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if (config == GPIO_CFG_DFLT) {
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uint16_t pupdn = gpio_default_config[pad].pupdn;
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uint16_t pullup = pupdn & (1 << pin);
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uint16_t pulldown = (pupdn >> 8) & (1 << pin);
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if ((pullup != 0) && (pulldown != 0)) {
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panic("Pullup and pulldown at same time on GPIO 0x%x", gpio);
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} else if (pullup != 0) {
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rPPURn(pad) |= (1 << pin);
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rPPDRn(pad) &= ~(1 << pin);
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} else if (pulldown != 0) {
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rPPURn(pad) &= ~(1 << pin);
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rPPDRn(pad) |= (1 << pin);
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} else {
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rPPURn(pad) &= ~(1 << pin);
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rPPDRn(pad) &= ~(1 << pin);
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}
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}
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}
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void gpio_configure_pupdn(gpio_t gpio, int32_t pupdn)
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{
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int pad = GPIO2PAD(gpio);
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int pin = 1 << GPIO2PIN(gpio);
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if (pupdn < GPIO_NO_PUPDN) {
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/* GPIO_PDN */
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rPPURn(pad) &= ~pin;
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rPPDRn(pad) |= pin;
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} else if (pupdn > GPIO_NO_PUPDN) {
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/* GPIO_PUP */
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rPPURn(pad) |= pin;
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rPPDRn(pad) &= ~pin;
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} else {
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/* GPIO_NO_PUPDN */
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rPPURn(pad) &= ~pin;
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rPPDRn(pad) &= ~pin;
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}
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}
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int gpio_init_pinconfig(void)
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{
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int pad;
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int pin;
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dprintf(DEBUG_SPEW, "gpio_init_pinconfig()\n");
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/* XXX is there a safe way to set the pullup/pulldown config and set the pin modes? */
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/*
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* since most of these pins are probably going to default to input coming out of the
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* boot rom, we'll set the pullup/pulldown first
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*/
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/* load the default pullup/pulldown configuration, disallowing
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the pullup and pulldown to be set at the same time */
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for (pad = 0; pad < GPIO_GROUP_COUNT; pad++) {
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uint32_t pullup;
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uint32_t pulldown;
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uint16_t pupdn;
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pupdn = gpio_default_config[pad].pupdn;
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pullup = pupdn & 0xFF;
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pulldown = (pupdn >> 8) & 0xFF;
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if ((pullup & pulldown) != 0)
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panic("Pullup and pulldown conflict on pins 0x%x of pad %d", pullup & pulldown, pad);
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rPPURn(pad) = pullup;
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rPPDRn(pad) = pulldown;
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}
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/* load the default PCON values, which should also set initial PDATs for gpio out */
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for (pad = 0; pad < GPIO_GROUP_COUNT; pad++)
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{
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uint32_t pcon;
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uint32_t ppie;
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ppie = 0xFF;
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pcon = gpio_default_config[pad].pcon;
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for (pin = 0; pin < 8; pin++) {
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if (((pcon >> (pin * 4)) & 0xF) == PCON_DISABLE) {
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pcon &= ~(0xF << (pin * 4));
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ppie &= ~(1 << pin);
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}
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}
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rPCONn(pad) = pcon;
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rPPIEn(pad) = ppie;
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}
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#ifdef DEFAULT_ODEN
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/* set port configuration for I2Cx and TWC */
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rODEN = DEFAULT_ODEN;
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#endif
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#if defined(DEFAULT_DSTR0)
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/* set the chip default drive strength */
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rDSTR0 = DEFAULT_DSTR0;
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#endif
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#ifdef DEFAULT_OSC_DSTR
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/* set oscillator drive strength */
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rOSC_DSTR = DEFAULT_OSC_DSTR;
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#endif
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return 0;
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}
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#if APPLICATION_IBOOT
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int gpio_diag_pinconfig(void)
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{
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return 0;
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}
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#endif /* APPLICATION_IBOOT */
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@@ -0,0 +1,85 @@
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/*
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* Copyright (C) 2007 Apple Inc. All rights reserved.
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#ifndef __SAMSUNG_GPIO_H
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#define __SAMSUNG_GPIO_H
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#include <platform/soc/hwregbase.h>
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/* Register Offsets for Samsung GPIOs */
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#define rPCONn(n) (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x000 + (n) * 0x20))
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#define rPDATn(n) (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x004 + (n) * 0x20))
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#define rPCTLn(n) (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x008 + (n) * 0x20))
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#define rPPURn(n) (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x00C + (n) * 0x20))
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#define rPPDRn(n) (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x010 + (n) * 0x20))
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#define rPPIEn(n) (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x014 + (n) * 0x20))
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#define rFSEL (*(volatile u_int32_t *)(GPIO_BASE_ADDR + GPIO_FSEL_OFFSET))
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#define rDSTR0 (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x380))
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#define rOSC_DSTR (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x388))
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#define rODEN (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x3C0))
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#define rEMAC0 (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x3C4))
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#define rEMAC1 (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x3C8))
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#define rEMAC2 (*(volatile u_int32_t *)(GPIO_BASE_ADDR + 0x3CC))
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/* Base Pin Defines for Samsung GPIOs */
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#define PORT(port, pin) ((u_int32_t)((port) << 8) | pin)
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#define GPIO2PIN(gpio) ((gpio) & 0x7)
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#define GPIO2PAD(gpio) (((gpio) >> 8) & 0x1f)
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/* Precomputes the PCON register's value */
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#define PCON(pinfunc0, pinfunc1, pinfunc2, pinfunc3, pinfunc4, pinfunc5, pinfunc6, pinfunc7) \
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((u_int32_t)(((pinfunc0) << 0) | ((pinfunc1) << 4) | ((pinfunc2) << 8) | ((pinfunc3) << 12) | \
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((pinfunc4) << 16) | ((pinfunc5) << 20) | ((pinfunc6) << 24) | ((pinfunc7) << 28)))
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/* some PCON constants */
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enum {
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PCON_IN = 0,
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PCON_OUT = 1,
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PCON_FUNC2 = 2,
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PCON_FUNC3 = 3,
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PCON_FUNC4 = 4,
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PCON_FUNC5 = 5,
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PCON_FUNC6 = 6,
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PCON_DISABLE = 0xd, /* not actually supported by the hardware, implies PCON_IN
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and input enable disabled */
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PCON_OUT_0 = 0xe, /* same as PCON_OUT, but also sets PDAT to zero */
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PCON_OUT_1 = 0xf /* same as PCON_OUT, but also sets PDAT to one */
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};
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/* pull up/down configuration */
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enum {
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NO_PUPDN = 0,
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PUP = (1 << 0),
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PDN = (1 << 8)
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};
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#define PUPDN(pinupdn0, pinupdn1, pinupdn2, pinupdn3, pinupdn4, pinupdn5, pinupdn6, pinupdn7) \
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((uint16_t)(((pinupdn0) << 0) | ((pinupdn1) << 1) | ((pinupdn2) << 2) | ((pinupdn3) << 3) | \
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((pinupdn4) << 4) | ((pinupdn5) << 5) | ((pinupdn6) << 6) | ((pinupdn7) << 7)))
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struct gpio_default_config {
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uint32_t pcon;
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uint16_t pupdn;
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};
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#define PINCONFIG(pcon0, pupdn0, pcon1, pupdn1, pcon2, pupdn2, pcon3, pupdn3, \
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pcon4, pupdn4, pcon5, pupdn5, pcon6, pupdn6, pcon7, pupdn7) \
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{ .pcon = PCON(pcon0, pcon1, pcon2, pcon3, pcon4, pcon5, pcon6, pcon7), \
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.pupdn = PUPDN(pupdn0, pupdn1, pupdn2, pupdn3, pupdn4, pupdn5, pupdn6, pupdn7) \
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}
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#endif /* __SAMSUNG_GPIO_H */
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@@ -0,0 +1,16 @@
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# Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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#
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# This document is the property of Apple Computer, Inc.
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# It is considered confidential and proprietary.
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#
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# This document may not be reproduced or transmitted in any form,
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# in whole or in part, without the express written permission of
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# Apple Computer, Inc.
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#
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LOCAL_DIR := $(GET_LOCAL_DIR)
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OPTIONS += \
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WITH_HW_GPIO=1
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ALL_OBJS += \
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$(LOCAL_DIR)/gpio.o
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