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path: root/roms/u-boot/drivers/gpio/stm32_gpio.c
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Diffstat (limited to 'roms/u-boot/drivers/gpio/stm32_gpio.c')
-rw-r--r--roms/u-boot/drivers/gpio/stm32_gpio.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/gpio/stm32_gpio.c b/roms/u-boot/drivers/gpio/stm32_gpio.c
new file mode 100644
index 000000000..125c23755
--- /dev/null
+++ b/roms/u-boot/drivers/gpio/stm32_gpio.c
@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
+ * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
+ */
+
+#define LOG_CATEGORY UCLASS_GPIO
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <log.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/stm32.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <dm/device_compat.h>
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+
+#define STM32_GPIOS_PER_BANK 16
+
+#define MODE_BITS(gpio_pin) ((gpio_pin) * 2)
+#define MODE_BITS_MASK 3
+#define BSRR_BIT(gpio_pin, value) BIT((gpio_pin) + (value ? 0 : 16))
+
+#define PUPD_BITS(gpio_pin) ((gpio_pin) * 2)
+#define PUPD_MASK 3
+
+#define OTYPE_BITS(gpio_pin) (gpio_pin)
+#define OTYPE_MSK 1
+
+static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
+ int idx,
+ int mode)
+{
+ int bits_index;
+ int mask;
+
+ bits_index = MODE_BITS(idx);
+ mask = MODE_BITS_MASK << bits_index;
+
+ clrsetbits_le32(&regs->moder, mask, mode << bits_index);
+}
+
+static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
+{
+ return (readl(&regs->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
+}
+
+static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
+ int idx,
+ enum stm32_gpio_otype otype)
+{
+ int bits;
+
+ bits = OTYPE_BITS(idx);
+ clrsetbits_le32(&regs->otyper, OTYPE_MSK << bits, otype << bits);
+}
+
+static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
+ int idx)
+{
+ return (readl(&regs->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
+}
+
+static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
+ int idx,
+ enum stm32_gpio_pupd pupd)
+{
+ int bits;
+
+ bits = PUPD_BITS(idx);
+ clrsetbits_le32(&regs->pupdr, PUPD_MASK << bits, pupd << bits);
+}
+
+static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
+ int idx)
+{
+ return (readl(&regs->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
+}
+
+/*
+ * convert gpio offset to gpio index taking into account gpio holes
+ * into gpio bank
+ */
+int stm32_offset_to_index(struct udevice *dev, unsigned int offset)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ unsigned int idx = 0;
+ int i;
+
+ for (i = 0; i < STM32_GPIOS_PER_BANK; i++) {
+ if (priv->gpio_range & BIT(i)) {
+ if (idx == offset)
+ return idx;
+ idx++;
+ }
+ }
+ /* shouldn't happen */
+ return -EINVAL;
+}
+
+static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
+
+ return 0;
+}
+
+static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
+
+ writel(BSRR_BIT(idx, value), &regs->bsrr);
+
+ return 0;
+}
+
+static int stm32_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ return readl(&regs->idr) & BIT(idx) ? 1 : 0;
+}
+
+static int stm32_gpio_set_value(struct udevice *dev, unsigned offset, int value)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ writel(BSRR_BIT(idx, value), &regs->bsrr);
+
+ return 0;
+}
+
+static int stm32_gpio_get_function(struct udevice *dev, unsigned int offset)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int bits_index;
+ int mask;
+ int idx;
+ u32 mode;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ bits_index = MODE_BITS(idx);
+ mask = MODE_BITS_MASK << bits_index;
+
+ mode = (readl(&regs->moder) & mask) >> bits_index;
+ if (mode == STM32_GPIO_MODE_OUT)
+ return GPIOF_OUTPUT;
+ if (mode == STM32_GPIO_MODE_IN)
+ return GPIOF_INPUT;
+ if (mode == STM32_GPIO_MODE_AN)
+ return GPIOF_UNUSED;
+
+ return GPIOF_FUNC;
+}
+
+static int stm32_gpio_set_flags(struct udevice *dev, unsigned int offset,
+ ulong flags)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ if (flags & GPIOD_IS_OUT) {
+ bool value = flags & GPIOD_IS_OUT_ACTIVE;
+
+ if (flags & GPIOD_OPEN_DRAIN)
+ stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_OD);
+ else
+ stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_PP);
+
+ stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
+ writel(BSRR_BIT(idx, value), &regs->bsrr);
+
+ } else if (flags & GPIOD_IS_IN) {
+ stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
+ }
+ if (flags & GPIOD_PULL_UP)
+ stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_UP);
+ else if (flags & GPIOD_PULL_DOWN)
+ stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_DOWN);
+
+ return 0;
+}
+
+static int stm32_gpio_get_flags(struct udevice *dev, unsigned int offset,
+ ulong *flagsp)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
+ ulong dir_flags = 0;
+
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ switch (stm32_gpio_get_moder(regs, idx)) {
+ case STM32_GPIO_MODE_OUT:
+ dir_flags |= GPIOD_IS_OUT;
+ if (stm32_gpio_get_otype(regs, idx) == STM32_GPIO_OTYPE_OD)
+ dir_flags |= GPIOD_OPEN_DRAIN;
+ if (readl(&regs->idr) & BIT(idx))
+ dir_flags |= GPIOD_IS_OUT_ACTIVE;
+ break;
+ case STM32_GPIO_MODE_IN:
+ dir_flags |= GPIOD_IS_IN;
+ break;
+ default:
+ break;
+ }
+ switch (stm32_gpio_get_pupd(regs, idx)) {
+ case STM32_GPIO_PUPD_UP:
+ dir_flags |= GPIOD_PULL_UP;
+ break;
+ case STM32_GPIO_PUPD_DOWN:
+ dir_flags |= GPIOD_PULL_DOWN;
+ break;
+ default:
+ break;
+ }
+ *flagsp = dir_flags;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops gpio_stm32_ops = {
+ .direction_input = stm32_gpio_direction_input,
+ .direction_output = stm32_gpio_direction_output,
+ .get_value = stm32_gpio_get_value,
+ .set_value = stm32_gpio_set_value,
+ .get_function = stm32_gpio_get_function,
+ .set_flags = stm32_gpio_set_flags,
+ .get_flags = stm32_gpio_get_flags,
+};
+
+static int gpio_stm32_probe(struct udevice *dev)
+{
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct ofnode_phandle_args args;
+ const char *name;
+ struct clk clk;
+ fdt_addr_t addr;
+ int ret, i;
+
+ addr = dev_read_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->regs = (struct stm32_gpio_regs *)addr;
+
+ name = dev_read_string(dev, "st,bank-name");
+ if (!name)
+ return -EINVAL;
+ uc_priv->bank_name = name;
+
+ i = 0;
+ ret = dev_read_phandle_with_args(dev, "gpio-ranges",
+ NULL, 3, i, &args);
+
+ if (!ret && args.args_count < 3)
+ return -EINVAL;
+
+ if (ret == -ENOENT) {
+ uc_priv->gpio_count = STM32_GPIOS_PER_BANK;
+ priv->gpio_range = GENMASK(STM32_GPIOS_PER_BANK - 1, 0);
+ }
+
+ while (ret != -ENOENT) {
+ priv->gpio_range |= GENMASK(args.args[2] + args.args[0] - 1,
+ args.args[0]);
+
+ uc_priv->gpio_count += args.args[2];
+
+ ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
+ ++i, &args);
+ if (!ret && args.args_count < 3)
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "addr = 0x%p bank_name = %s gpio_count = %d gpio_range = 0x%x\n",
+ (u32 *)priv->regs, uc_priv->bank_name, uc_priv->gpio_count,
+ priv->gpio_range);
+
+ ret = clk_get_by_index(dev, 0, &clk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_enable(&clk);
+
+ if (ret) {
+ dev_err(dev, "failed to enable clock\n");
+ return ret;
+ }
+ dev_dbg(dev, "clock enabled\n");
+
+ return 0;
+}
+
+U_BOOT_DRIVER(gpio_stm32) = {
+ .name = "gpio_stm32",
+ .id = UCLASS_GPIO,
+ .probe = gpio_stm32_probe,
+ .ops = &gpio_stm32_ops,
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
+ .priv_auto = sizeof(struct stm32_gpio_priv),
+};