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authorPatrice Chotard <patrice.chotard@st.com>2016-04-29 16:25:43 +0200
committerLinus Walleij <linus.walleij@linaro.org>2016-05-10 13:48:26 +0200
commit3beed93c16170eacbfaa189dd4c1dc71866d3d3a (patch)
tree3f1a048959d05235c07610893ac5c5c1650bb026 /drivers/pinctrl
parentcaee57ec71e1a0cb50b6028c706cfe541dcb080a (diff)
downloadop-kernel-dev-3beed93c16170eacbfaa189dd4c1dc71866d3d3a.zip
op-kernel-dev-3beed93c16170eacbfaa189dd4c1dc71866d3d3a.tar.gz
pinctrl: stm32: Implement .pin_config_dbg_show()
Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/stm32/pinctrl-stm32.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index 72b7904..e51c1cf 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -454,6 +454,29 @@ static void stm32_pmx_set_mode(struct stm32_gpio_bank *bank,
clk_disable(bank->clk);
}
+static void stm32_pmx_get_mode(struct stm32_gpio_bank *bank,
+ int pin, u32 *mode, u32 *alt)
+{
+ u32 val;
+ int alt_shift = (pin % 8) * 4;
+ int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
+ unsigned long flags;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = readl_relaxed(bank->base + alt_offset);
+ val &= GENMASK(alt_shift + 3, alt_shift);
+ *alt = val >> alt_shift;
+
+ val = readl_relaxed(bank->base + STM32_GPIO_MODER);
+ val &= GENMASK(pin * 2 + 1, pin * 2);
+ *mode = val >> (pin * 2);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+}
+
static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
unsigned function,
unsigned group)
@@ -525,6 +548,24 @@ static void stm32_pconf_set_driving(struct stm32_gpio_bank *bank,
clk_disable(bank->clk);
}
+static u32 stm32_pconf_get_driving(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
+ val &= BIT(offset);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+
+ return (val >> offset);
+}
+
static void stm32_pconf_set_speed(struct stm32_gpio_bank *bank,
unsigned offset, u32 speed)
{
@@ -543,6 +584,24 @@ static void stm32_pconf_set_speed(struct stm32_gpio_bank *bank,
clk_disable(bank->clk);
}
+static u32 stm32_pconf_get_speed(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR);
+ val &= GENMASK(offset * 2 + 1, offset * 2);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+
+ return (val >> (offset * 2));
+}
+
static void stm32_pconf_set_bias(struct stm32_gpio_bank *bank,
unsigned offset, u32 bias)
{
@@ -561,6 +620,57 @@ static void stm32_pconf_set_bias(struct stm32_gpio_bank *bank,
clk_disable(bank->clk);
}
+static u32 stm32_pconf_get_bias(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = readl_relaxed(bank->base + STM32_GPIO_PUPDR);
+ val &= GENMASK(offset * 2 + 1, offset * 2);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+
+ return (val >> (offset * 2));
+}
+
+static bool stm32_pconf_input_get(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset));
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+
+ return val;
+}
+
+static bool stm32_pconf_output_get(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+ val = !!(readl_relaxed(bank->base + STM32_GPIO_ODR) & BIT(offset));
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+
+ return val;
+}
+
static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev,
unsigned int pin, enum pin_config_param param,
enum pin_config_param arg)
@@ -634,9 +744,73 @@ static int stm32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
return 0;
}
+static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned int pin)
+{
+ struct pinctrl_gpio_range *range;
+ struct stm32_gpio_bank *bank;
+ int offset;
+ u32 mode, alt, drive, speed, bias;
+ static const char * const modes[] = {
+ "input", "output", "alternate", "analog" };
+ static const char * const speeds[] = {
+ "low", "medium", "high", "very high" };
+ static const char * const biasing[] = {
+ "floating", "pull up", "pull down", "" };
+ bool val;
+
+ range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
+ bank = gpio_range_to_bank(range);
+ offset = stm32_gpio_pin(pin);
+
+ stm32_pmx_get_mode(bank, offset, &mode, &alt);
+ bias = stm32_pconf_get_bias(bank, offset);
+
+ seq_printf(s, "%s ", modes[mode]);
+
+ switch (mode) {
+ /* input */
+ case 0:
+ val = stm32_pconf_input_get(bank, offset);
+ seq_printf(s, "- %s - %s",
+ val ? "high" : "low",
+ biasing[bias]);
+ break;
+
+ /* output */
+ case 1:
+ drive = stm32_pconf_get_driving(bank, offset);
+ speed = stm32_pconf_get_speed(bank, offset);
+ val = stm32_pconf_output_get(bank, offset);
+ seq_printf(s, "- %s - %s - %s - %s %s",
+ val ? "high" : "low",
+ drive ? "open drain" : "push pull",
+ biasing[bias],
+ speeds[speed], "speed");
+ break;
+
+ /* alternate */
+ case 2:
+ drive = stm32_pconf_get_driving(bank, offset);
+ speed = stm32_pconf_get_speed(bank, offset);
+ seq_printf(s, "%d - %s -%s", alt,
+ drive ? "open drain" : "push pull",
+ biasing[bias],
+ speeds[speed], "speed");
+ break;
+
+ /* analog */
+ case 3:
+ break;
+ }
+}
+
+
static const struct pinconf_ops stm32_pconf_ops = {
.pin_config_group_get = stm32_pconf_group_get,
.pin_config_group_set = stm32_pconf_group_set,
+ .pin_config_dbg_show = stm32_pconf_dbg_show,
};
static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
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