+// SPDX-License-Identifier: GPL-2.0+
/*
- * (C) Copyright 2011
- * Yuri Tikhonov, Emcraft Systems, yur@emcraft.com
- *
- * (C) Copyright 2015
- * Kamil Lulko, <kamil.lulko@gmail.com>
- *
- * Copyright 2015 ATS Advanced Telematics Systems GmbH
- * Copyright 2015 Konsulko Group, Matt Porter <mporter@konsulko.com>
- *
- * 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 <asm/io.h>
-#include <asm/errno.h>
+#include <clk.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <log.h>
#include <asm/arch/stm32.h>
-#include <asm/arch/gpio.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-#if defined(CONFIG_STM32F4)
-#define STM32_GPIOA_BASE (STM32_AHB1PERIPH_BASE + 0x0000)
-#define STM32_GPIOB_BASE (STM32_AHB1PERIPH_BASE + 0x0400)
-#define STM32_GPIOC_BASE (STM32_AHB1PERIPH_BASE + 0x0800)
-#define STM32_GPIOD_BASE (STM32_AHB1PERIPH_BASE + 0x0C00)
-#define STM32_GPIOE_BASE (STM32_AHB1PERIPH_BASE + 0x1000)
-#define STM32_GPIOF_BASE (STM32_AHB1PERIPH_BASE + 0x1400)
-#define STM32_GPIOG_BASE (STM32_AHB1PERIPH_BASE + 0x1800)
-#define STM32_GPIOH_BASE (STM32_AHB1PERIPH_BASE + 0x1C00)
-#define STM32_GPIOI_BASE (STM32_AHB1PERIPH_BASE + 0x2000)
-
-static const unsigned long io_base[] = {
- STM32_GPIOA_BASE, STM32_GPIOB_BASE, STM32_GPIOC_BASE,
- STM32_GPIOD_BASE, STM32_GPIOE_BASE, STM32_GPIOF_BASE,
- STM32_GPIOG_BASE, STM32_GPIOH_BASE, STM32_GPIOI_BASE
-};
+#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>
-struct stm32_gpio_regs {
- u32 moder; /* GPIO port mode */
- u32 otyper; /* GPIO port output type */
- u32 ospeedr; /* GPIO port output speed */
- u32 pupdr; /* GPIO port pull-up/pull-down */
- u32 idr; /* GPIO port input data */
- u32 odr; /* GPIO port output data */
- u32 bsrr; /* GPIO port bit set/reset */
- u32 lckr; /* GPIO port configuration lock */
- u32 afr[2]; /* GPIO alternate function */
-};
+#include "stm32_gpio_priv.h"
-#define CHECK_DSC(x) (!x || x->port > 8 || x->pin > 15)
-#define CHECK_CTL(x) (!x || x->af > 15 || x->mode > 3 || x->otype > 1 || \
- x->pupd > 2 || x->speed > 3)
+#define STM32_GPIOS_PER_BANK 16
-int stm32_gpio_config(const struct stm32_gpio_dsc *dsc,
- const struct stm32_gpio_ctl *ctl)
-{
- struct stm32_gpio_regs *gpio_regs;
- u32 i;
- int rv;
+#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))
- if (CHECK_DSC(dsc)) {
- rv = -EINVAL;
- goto out;
- }
- if (CHECK_CTL(ctl)) {
- rv = -EINVAL;
- goto out;
- }
+#define PUPD_BITS(gpio_pin) ((gpio_pin) * 2)
+#define PUPD_MASK 3
- gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
+#define OTYPE_BITS(gpio_pin) (gpio_pin)
+#define OTYPE_MSK 1
- i = (dsc->pin & 0x07) * 4;
- clrsetbits_le32(&gpio_regs->afr[dsc->pin >> 3], 0xF << i, ctl->af << i);
+static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
+ int idx,
+ int mode)
+{
+ int bits_index;
+ int mask;
- i = dsc->pin * 2;
+ bits_index = MODE_BITS(idx);
+ mask = MODE_BITS_MASK << bits_index;
- clrsetbits_le32(&gpio_regs->moder, 0x3 << i, ctl->mode << i);
- clrsetbits_le32(&gpio_regs->otyper, 0x3 << i, ctl->otype << i);
- clrsetbits_le32(&gpio_regs->ospeedr, 0x3 << i, ctl->speed << i);
- clrsetbits_le32(&gpio_regs->pupdr, 0x3 << i, ctl->pupd << i);
+ clrsetbits_le32(®s->moder, mask, mode << bits_index);
+}
- rv = 0;
-out:
- return rv;
+static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
+{
+ return (readl(®s->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
}
-#elif defined(CONFIG_STM32F1)
-#define STM32_GPIOA_BASE (STM32_APB2PERIPH_BASE + 0x0800)
-#define STM32_GPIOB_BASE (STM32_APB2PERIPH_BASE + 0x0C00)
-#define STM32_GPIOC_BASE (STM32_APB2PERIPH_BASE + 0x1000)
-#define STM32_GPIOD_BASE (STM32_APB2PERIPH_BASE + 0x1400)
-#define STM32_GPIOE_BASE (STM32_APB2PERIPH_BASE + 0x1800)
-#define STM32_GPIOF_BASE (STM32_APB2PERIPH_BASE + 0x1C00)
-#define STM32_GPIOG_BASE (STM32_APB2PERIPH_BASE + 0x2000)
-
-static const unsigned long io_base[] = {
- STM32_GPIOA_BASE, STM32_GPIOB_BASE, STM32_GPIOC_BASE,
- STM32_GPIOD_BASE, STM32_GPIOE_BASE, STM32_GPIOF_BASE,
- STM32_GPIOG_BASE
-};
-#define STM32_GPIO_CR_MODE_MASK 0x3
-#define STM32_GPIO_CR_MODE_SHIFT(p) (p * 4)
-#define STM32_GPIO_CR_CNF_MASK 0x3
-#define STM32_GPIO_CR_CNF_SHIFT(p) (p * 4 + 2)
-
-struct stm32_gpio_regs {
- u32 crl; /* GPIO port configuration low */
- u32 crh; /* GPIO port configuration high */
- u32 idr; /* GPIO port input data */
- u32 odr; /* GPIO port output data */
- u32 bsrr; /* GPIO port bit set/reset */
- u32 brr; /* GPIO port bit reset */
- u32 lckr; /* GPIO port configuration lock */
-};
+static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
+ int idx,
+ enum stm32_gpio_otype otype)
+{
+ int bits;
-#define CHECK_DSC(x) (!x || x->port > 6 || x->pin > 15)
-#define CHECK_CTL(x) (!x || x->mode > 3 || x->icnf > 3 || x->ocnf > 3 || \
- x->pupd > 1)
+ bits = OTYPE_BITS(idx);
+ clrsetbits_le32(®s->otyper, OTYPE_MSK << bits, otype << bits);
+}
-int stm32_gpio_config(const struct stm32_gpio_dsc *dsc,
- const struct stm32_gpio_ctl *ctl)
+static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
+ int idx)
{
- struct stm32_gpio_regs *gpio_regs;
- u32 *cr;
- int p, crp;
- int rv;
-
- if (CHECK_DSC(dsc)) {
- rv = -EINVAL;
- goto out;
- }
- if (CHECK_CTL(ctl)) {
- rv = -EINVAL;
- goto out;
- }
+ return (readl(®s->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
+}
- p = dsc->pin;
+static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
+ int idx,
+ enum stm32_gpio_pupd pupd)
+{
+ int bits;
- gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
+ bits = PUPD_BITS(idx);
+ clrsetbits_le32(®s->pupdr, PUPD_MASK << bits, pupd << bits);
+}
- if (p < 8) {
- cr = &gpio_regs->crl;
- crp = p;
- } else {
- cr = &gpio_regs->crh;
- crp = p - 8;
- }
+static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
+ int idx)
+{
+ return (readl(®s->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
+}
- clrbits_le32(cr, 0x3 << STM32_GPIO_CR_MODE_SHIFT(crp));
- setbits_le32(cr, ctl->mode << STM32_GPIO_CR_MODE_SHIFT(crp));
-
- clrbits_le32(cr, 0x3 << STM32_GPIO_CR_CNF_SHIFT(crp));
- /* Inputs set the optional pull up / pull down */
- if (ctl->mode == STM32_GPIO_MODE_IN) {
- setbits_le32(cr, ctl->icnf << STM32_GPIO_CR_CNF_SHIFT(crp));
- clrbits_le32(&gpio_regs->odr, 0x1 << p);
- setbits_le32(&gpio_regs->odr, ctl->pupd << p);
- } else {
- setbits_le32(cr, ctl->ocnf << STM32_GPIO_CR_CNF_SHIFT(crp));
+/*
+ * 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;
- rv = 0;
-out:
- return rv;
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
+
+ stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
+
+ return 0;
}
-#else
-#error STM32 family not supported
-#endif
-int stm32_gpout_set(const struct stm32_gpio_dsc *dsc, int state)
+static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
{
- struct stm32_gpio_regs *gpio_regs;
- int rv;
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
- if (CHECK_DSC(dsc)) {
- rv = -EINVAL;
- goto out;
- }
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
- gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
+ stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
- if (state)
- writel(1 << dsc->pin, &gpio_regs->bsrr);
- else
- writel(1 << (dsc->pin + 16), &gpio_regs->bsrr);
+ writel(BSRR_BIT(idx, value), ®s->bsrr);
- rv = 0;
-out:
- return rv;
+ return 0;
}
-int stm32_gpin_get(const struct stm32_gpio_dsc *dsc)
+static int stm32_gpio_get_value(struct udevice *dev, unsigned offset)
{
- struct stm32_gpio_regs *gpio_regs;
- int rv;
+ struct stm32_gpio_priv *priv = dev_get_priv(dev);
+ struct stm32_gpio_regs *regs = priv->regs;
+ int idx;
- if (CHECK_DSC(dsc)) {
- rv = -EINVAL;
- goto out;
- }
+ idx = stm32_offset_to_index(dev, offset);
+ if (idx < 0)
+ return idx;
- gpio_regs = (struct stm32_gpio_regs *)io_base[dsc->port];
- rv = readl(&gpio_regs->idr) & (1 << dsc->pin);
-out:
- return rv;
+ return readl(®s->idr) & BIT(idx) ? 1 : 0;
}
-/* Common GPIO API */
-
-int gpio_request(unsigned gpio, const char *label)
+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), ®s->bsrr);
+
return 0;
}
-int gpio_free(unsigned gpio)
+static int stm32_gpio_get_function(struct udevice *dev, unsigned int offset)
{
- return 0;
+ 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(®s->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;
}
-int gpio_direction_input(unsigned gpio)
+static int stm32_gpio_set_flags(struct udevice *dev, unsigned int offset,
+ ulong flags)
{
- struct stm32_gpio_dsc dsc;
- struct stm32_gpio_ctl ctl;
-
- dsc.port = stm32_gpio_to_port(gpio);
- dsc.pin = stm32_gpio_to_pin(gpio);
-#if defined(CONFIG_STM32F4)
- ctl.af = STM32_GPIO_AF0;
- ctl.mode = STM32_GPIO_MODE_IN;
- ctl.otype = STM32_GPIO_OTYPE_PP;
- ctl.pupd = STM32_GPIO_PUPD_NO;
- ctl.speed = STM32_GPIO_SPEED_50M;
-#elif defined(CONFIG_STM32F1)
- ctl.mode = STM32_GPIO_MODE_IN;
- ctl.icnf = STM32_GPIO_ICNF_IN_FLT;
- ctl.ocnf = STM32_GPIO_OCNF_GP_PP; /* ignored for input */
- ctl.pupd = STM32_GPIO_PUPD_UP; /* ignored for floating */
-#else
-#error STM32 family not supported
-#endif
-
- return stm32_gpio_config(&dsc, &ctl);
+ 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), ®s->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;
}
-int gpio_direction_output(unsigned gpio, int value)
+static int stm32_gpio_get_flags(struct udevice *dev, unsigned int offset,
+ ulong *flagsp)
{
- struct stm32_gpio_dsc dsc;
- struct stm32_gpio_ctl ctl;
- int res;
-
- dsc.port = stm32_gpio_to_port(gpio);
- dsc.pin = stm32_gpio_to_pin(gpio);
-#if defined(CONFIG_STM32F4)
- ctl.af = STM32_GPIO_AF0;
- ctl.mode = STM32_GPIO_MODE_OUT;
- ctl.pupd = STM32_GPIO_PUPD_NO;
- ctl.speed = STM32_GPIO_SPEED_50M;
-#elif defined(CONFIG_STM32F1)
- ctl.mode = STM32_GPIO_MODE_OUT_50M;
- ctl.ocnf = STM32_GPIO_OCNF_GP_PP;
- ctl.icnf = STM32_GPIO_ICNF_IN_FLT; /* ignored for output */
- ctl.pupd = STM32_GPIO_PUPD_UP; /* ignored for output */
-#else
-#error STM32 family not supported
-#endif
-
- res = stm32_gpio_config(&dsc, &ctl);
- if (res < 0)
- goto out;
- res = stm32_gpout_set(&dsc, value);
-out:
- return res;
+ 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(®s->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;
}
-int gpio_get_value(unsigned gpio)
+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_dsc dsc;
+ 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);
+ }
- dsc.port = stm32_gpio_to_port(gpio);
- dsc.pin = stm32_gpio_to_pin(gpio);
+ while (ret != -ENOENT) {
+ priv->gpio_range |= GENMASK(args.args[2] + args.args[0] - 1,
+ args.args[0]);
- return stm32_gpin_get(&dsc);
-}
+ uc_priv->gpio_count += args.args[2];
-int gpio_set_value(unsigned gpio, int value)
-{
- struct stm32_gpio_dsc dsc;
+ 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);
- dsc.port = stm32_gpio_to_port(gpio);
- dsc.pin = stm32_gpio_to_pin(gpio);
+ if (ret) {
+ dev_err(dev, "failed to enable clock\n");
+ return ret;
+ }
+ dev_dbg(dev, "clock enabled\n");
- return stm32_gpout_set(&dsc, value);
+ 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),
+};
projects / platform / kernel / u-boot.git / blobdiff