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7e0a96d559
It is convenient to be able to adjust some of the flags for a GPIO while leaving others alone. Add a function for this. Update dm_gpio_set_dir_flags() to make use of this. Also update dm_gpio_set_value() to use this also, since this allows the open-drain / open-source features to be implemented directly in the driver, rather than using the uclass workaround. Update the sandbox tests accordingly. This involves a lot of changes to dm_test_gpio_opendrain_opensource() since we no-longer have the direciion being reported differently depending on the open drain/open source flags. Also update the STM32 drivers to let the uclass handle the active low/high logic. Drop the GPIOD_FLAGS_OUTPUT() macro which is no-longer used. Signed-off-by: Simon Glass <sjg@chromium.org> Tested-by: Kory Maincent <kory.maincent@bootlin.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
349 lines
7.9 KiB
C
349 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
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*/
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#define LOG_CATEGORY UCLASS_GPIO
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/stm32.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <dm/device_compat.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#define STM32_GPIOS_PER_BANK 16
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#define MODE_BITS(gpio_pin) ((gpio_pin) * 2)
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#define MODE_BITS_MASK 3
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#define BSRR_BIT(gpio_pin, value) BIT((gpio_pin) + (value ? 0 : 16))
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#define PUPD_BITS(gpio_pin) ((gpio_pin) * 2)
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#define PUPD_MASK 3
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#define OTYPE_BITS(gpio_pin) (gpio_pin)
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#define OTYPE_MSK 1
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static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
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int idx,
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int mode)
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{
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int bits_index;
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int mask;
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bits_index = MODE_BITS(idx);
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mask = MODE_BITS_MASK << bits_index;
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clrsetbits_le32(®s->moder, mask, mode << bits_index);
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}
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static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
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{
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return (readl(®s->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
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}
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static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
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int idx,
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enum stm32_gpio_otype otype)
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{
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int bits;
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bits = OTYPE_BITS(idx);
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clrsetbits_le32(®s->otyper, OTYPE_MSK << bits, otype << bits);
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}
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static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
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int idx)
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{
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return (readl(®s->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
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}
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static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
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int idx,
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enum stm32_gpio_pupd pupd)
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{
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int bits;
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bits = PUPD_BITS(idx);
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clrsetbits_le32(®s->pupdr, PUPD_MASK << bits, pupd << bits);
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}
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static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
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int idx)
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{
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return (readl(®s->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
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}
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/*
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* convert gpio offset to gpio index taking into account gpio holes
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* into gpio bank
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*/
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int stm32_offset_to_index(struct udevice *dev, unsigned int offset)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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unsigned int idx = 0;
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int i;
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for (i = 0; i < STM32_GPIOS_PER_BANK; i++) {
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if (priv->gpio_range & BIT(i)) {
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if (idx == offset)
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return idx;
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idx++;
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}
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}
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/* shouldn't happen */
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return -EINVAL;
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}
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static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int idx;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
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return 0;
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}
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static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int idx;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
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writel(BSRR_BIT(idx, value), ®s->bsrr);
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return 0;
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}
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static int stm32_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int idx;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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return readl(®s->idr) & BIT(idx) ? 1 : 0;
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}
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static int stm32_gpio_set_value(struct udevice *dev, unsigned offset, int value)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int idx;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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writel(BSRR_BIT(idx, value), ®s->bsrr);
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return 0;
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}
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static int stm32_gpio_get_function(struct udevice *dev, unsigned int offset)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int bits_index;
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int mask;
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int idx;
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u32 mode;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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bits_index = MODE_BITS(idx);
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mask = MODE_BITS_MASK << bits_index;
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mode = (readl(®s->moder) & mask) >> bits_index;
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if (mode == STM32_GPIO_MODE_OUT)
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return GPIOF_OUTPUT;
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if (mode == STM32_GPIO_MODE_IN)
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return GPIOF_INPUT;
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if (mode == STM32_GPIO_MODE_AN)
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return GPIOF_UNUSED;
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return GPIOF_FUNC;
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}
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static int stm32_gpio_set_flags(struct udevice *dev, unsigned int offset,
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ulong flags)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int idx;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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if (flags & GPIOD_IS_OUT) {
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bool value = flags & GPIOD_IS_OUT_ACTIVE;
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if (flags & GPIOD_OPEN_DRAIN)
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stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_OD);
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else
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stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_PP);
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stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
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writel(BSRR_BIT(idx, value), ®s->bsrr);
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} else if (flags & GPIOD_IS_IN) {
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stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
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}
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if (flags & GPIOD_PULL_UP)
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stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_UP);
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else if (flags & GPIOD_PULL_DOWN)
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stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_DOWN);
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return 0;
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}
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static int stm32_gpio_get_flags(struct udevice *dev, unsigned int offset,
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ulong *flagsp)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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int idx;
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ulong dir_flags = 0;
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idx = stm32_offset_to_index(dev, offset);
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if (idx < 0)
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return idx;
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switch (stm32_gpio_get_moder(regs, idx)) {
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case STM32_GPIO_MODE_OUT:
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dir_flags |= GPIOD_IS_OUT;
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if (stm32_gpio_get_otype(regs, idx) == STM32_GPIO_OTYPE_OD)
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dir_flags |= GPIOD_OPEN_DRAIN;
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if (readl(®s->idr) & BIT(idx))
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dir_flags |= GPIOD_IS_OUT_ACTIVE;
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break;
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case STM32_GPIO_MODE_IN:
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dir_flags |= GPIOD_IS_IN;
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break;
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default:
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break;
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}
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switch (stm32_gpio_get_pupd(regs, idx)) {
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case STM32_GPIO_PUPD_UP:
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dir_flags |= GPIOD_PULL_UP;
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break;
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case STM32_GPIO_PUPD_DOWN:
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dir_flags |= GPIOD_PULL_DOWN;
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break;
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default:
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break;
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}
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*flagsp = dir_flags;
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return 0;
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}
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static const struct dm_gpio_ops gpio_stm32_ops = {
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.direction_input = stm32_gpio_direction_input,
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.direction_output = stm32_gpio_direction_output,
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.get_value = stm32_gpio_get_value,
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.set_value = stm32_gpio_set_value,
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.get_function = stm32_gpio_get_function,
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.set_flags = stm32_gpio_set_flags,
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.get_flags = stm32_gpio_get_flags,
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};
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static int gpio_stm32_probe(struct udevice *dev)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct ofnode_phandle_args args;
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const char *name;
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struct clk clk;
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fdt_addr_t addr;
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int ret, i;
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addr = dev_read_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->regs = (struct stm32_gpio_regs *)addr;
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name = dev_read_string(dev, "st,bank-name");
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if (!name)
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return -EINVAL;
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uc_priv->bank_name = name;
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i = 0;
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ret = dev_read_phandle_with_args(dev, "gpio-ranges",
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NULL, 3, i, &args);
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if (!ret && args.args_count < 3)
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return -EINVAL;
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if (ret == -ENOENT) {
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uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
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priv->gpio_range = GENMASK(STM32_GPIOS_PER_BANK - 1, 0);
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}
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while (ret != -ENOENT) {
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priv->gpio_range |= GENMASK(args.args[2] + args.args[0] - 1,
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args.args[0]);
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uc_priv->gpio_count += args.args[2];
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ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
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++i, &args);
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if (!ret && args.args_count < 3)
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return -EINVAL;
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}
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dev_dbg(dev, "addr = 0x%p bank_name = %s gpio_count = %d gpio_range = 0x%x\n",
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(u32 *)priv->regs, uc_priv->bank_name, uc_priv->gpio_count,
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priv->gpio_range);
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret < 0)
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return ret;
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ret = clk_enable(&clk);
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if (ret) {
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dev_err(dev, "failed to enable clock\n");
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return ret;
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}
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dev_dbg(dev, "clock enabled\n");
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return 0;
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}
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U_BOOT_DRIVER(gpio_stm32) = {
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.name = "gpio_stm32",
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.id = UCLASS_GPIO,
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.probe = gpio_stm32_probe,
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.ops = &gpio_stm32_ops,
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.priv_auto = sizeof(struct stm32_gpio_priv),
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};
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