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path: root/drivers/pinctrl/pinctrl-nomadik.c
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Diffstat (limited to 'drivers/pinctrl/pinctrl-nomadik.c')
-rw-r--r--drivers/pinctrl/pinctrl-nomadik.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index 7543eb2..8c632e9 100644
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -25,6 +25,9 @@
#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+/* Since we request GPIOs from ourself */
+#include <linux/pinctrl/consumer.h>
#include <asm/mach/irq.h>
@@ -873,6 +876,25 @@ static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
}
/* I/O Functions */
+
+static int nmk_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ /*
+ * Map back to global GPIO space and request muxing, the direction
+ * parameter does not matter for this controller.
+ */
+ int gpio = chip->base + offset;
+
+ return pinctrl_request_gpio(gpio);
+}
+
+static void nmk_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ int gpio = chip->base + offset;
+
+ pinctrl_free_gpio(gpio);
+}
+
static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
{
struct nmk_gpio_chip *nmk_chip =
@@ -1023,6 +1045,8 @@ static inline void nmk_gpio_dbg_show_one(struct seq_file *s,
/* This structure is replicated for each GPIO block allocated at probe time */
static struct gpio_chip nmk_gpio_template = {
+ .request = nmk_gpio_request,
+ .free = nmk_gpio_free,
.direction_input = nmk_gpio_make_input,
.get = nmk_gpio_get_input,
.direction_output = nmk_gpio_make_output,
@@ -1365,9 +1389,189 @@ static struct pinctrl_ops nmk_pinctrl_ops = {
.pin_dbg_show = nmk_pin_dbg_show,
};
+static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+ return npct->soc->nfunctions;
+}
+
+static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev,
+ unsigned function)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+ return npct->soc->functions[function].name;
+}
+
+static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
+ unsigned function,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = npct->soc->functions[function].groups;
+ *num_groups = npct->soc->functions[function].ngroups;
+
+ return 0;
+}
+
+static int nmk_pmx_enable(struct pinctrl_dev *pctldev, unsigned function,
+ unsigned group)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+ const struct nmk_pingroup *g;
+ static unsigned int slpm[NUM_BANKS];
+ unsigned long flags;
+ bool glitch;
+ int ret = -EINVAL;
+ int i;
+
+ g = &npct->soc->groups[group];
+
+ if (g->altsetting < 0)
+ return -EINVAL;
+
+ dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);
+
+ /* Handle this special glitch on altfunction C */
+ glitch = (g->altsetting == NMK_GPIO_ALT_C);
+
+ if (glitch) {
+ spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
+
+ /* Initially don't put any pins to sleep when switching */
+ memset(slpm, 0xff, sizeof(slpm));
+
+ /*
+ * Then mask the pins that need to be sleeping now when we're
+ * switching to the ALT C function.
+ */
+ for (i = 0; i < g->npins; i++)
+ slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
+ nmk_gpio_glitch_slpm_init(slpm);
+ }
+
+ for (i = 0; i < g->npins; i++) {
+ struct pinctrl_gpio_range *range;
+ struct nmk_gpio_chip *nmk_chip;
+ struct gpio_chip *chip;
+ unsigned bit;
+
+ range = nmk_match_gpio_range(pctldev, g->pins[i]);
+ if (!range) {
+ dev_err(npct->dev,
+ "invalid pin offset %d in group %s at index %d\n",
+ g->pins[i], g->name, i);
+ goto out_glitch;
+ }
+ if (!range->gc) {
+ dev_err(npct->dev, "GPIO chip missing in range for pin offset %d in group %s at index %d\n",
+ g->pins[i], g->name, i);
+ goto out_glitch;
+ }
+ chip = range->gc;
+ nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
+ dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);
+
+ clk_enable(nmk_chip->clk);
+ bit = g->pins[i] % NMK_GPIO_PER_CHIP;
+ /*
+ * If the pin is switching to altfunc, and there was an
+ * interrupt installed on it which has been lazy disabled,
+ * actually mask the interrupt to prevent spurious interrupts
+ * that would occur while the pin is under control of the
+ * peripheral. Only SKE does this.
+ */
+ nmk_gpio_disable_lazy_irq(nmk_chip, bit);
+
+ __nmk_gpio_set_mode_safe(nmk_chip, bit, g->altsetting, glitch);
+ clk_disable(nmk_chip->clk);
+ }
+
+ /* When all pins are successfully reconfigured we get here */
+ ret = 0;
+
+out_glitch:
+ if (glitch) {
+ nmk_gpio_glitch_slpm_restore(slpm);
+ spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
+ }
+
+ return ret;
+}
+
+static void nmk_pmx_disable(struct pinctrl_dev *pctldev,
+ unsigned function, unsigned group)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+ const struct nmk_pingroup *g;
+
+ g = &npct->soc->groups[group];
+
+ if (g->altsetting < 0)
+ return;
+
+ /* Poke out the mux, set the pin to some default state? */
+ dev_dbg(npct->dev, "disable group %s, %u pins\n", g->name, g->npins);
+}
+
+int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+ struct nmk_gpio_chip *nmk_chip;
+ struct gpio_chip *chip;
+ unsigned bit;
+
+ if (!range) {
+ dev_err(npct->dev, "invalid range\n");
+ return -EINVAL;
+ }
+ if (!range->gc) {
+ dev_err(npct->dev, "missing GPIO chip in range\n");
+ return -EINVAL;
+ }
+ chip = range->gc;
+ nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
+
+ dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
+
+ clk_enable(nmk_chip->clk);
+ bit = offset % NMK_GPIO_PER_CHIP;
+ /* There is no glitch when converting any pin to GPIO */
+ __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
+ clk_disable(nmk_chip->clk);
+
+ return 0;
+}
+
+void nmk_gpio_disable_free(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset)
+{
+ struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+ dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
+ /* Set the pin to some default state, GPIO is usually default */
+}
+
+static struct pinmux_ops nmk_pinmux_ops = {
+ .get_functions_count = nmk_pmx_get_funcs_cnt,
+ .get_function_name = nmk_pmx_get_func_name,
+ .get_function_groups = nmk_pmx_get_func_groups,
+ .enable = nmk_pmx_enable,
+ .disable = nmk_pmx_disable,
+ .gpio_request_enable = nmk_gpio_request_enable,
+ .gpio_disable_free = nmk_gpio_disable_free,
+};
+
static struct pinctrl_desc nmk_pinctrl_desc = {
.name = "pinctrl-nomadik",
.pctlops = &nmk_pinctrl_ops,
+ .pmxops = &nmk_pinmux_ops,
.owner = THIS_MODULE,
};
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