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path: root/drivers/pinctrl/pinctrl-st.c
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Diffstat (limited to 'drivers/pinctrl/pinctrl-st.c')
-rw-r--r--drivers/pinctrl/pinctrl-st.c462
1 files changed, 415 insertions, 47 deletions
diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 320c27363cc8..bd725b0a4341 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -13,7 +13,12 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
#include <linux/of.h>
+#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
@@ -266,11 +271,59 @@ struct st_pctl_group {
struct st_pinconf *pin_conf;
};
+/*
+ * Edge triggers are not supported at hardware level, it is supported by
+ * software by exploiting the level trigger support in hardware.
+ * Software uses a virtual register (EDGE_CONF) for edge trigger configuration
+ * of each gpio pin in a GPIO bank.
+ *
+ * Each bank has a 32 bit EDGE_CONF register which is divided in to 8 parts of
+ * 4-bits. Each 4-bit space is allocated for each pin in a gpio bank.
+ *
+ * bit allocation per pin is:
+ * Bits: [0 - 3] | [4 - 7] [8 - 11] ... ... ... ... [ 28 - 31]
+ * --------------------------------------------------------
+ * | pin-0 | pin-2 | pin-3 | ... ... ... ... | pin -7 |
+ * --------------------------------------------------------
+ *
+ * A pin can have one of following the values in its edge configuration field.
+ *
+ * ------- ----------------------------
+ * [0-3] - Description
+ * ------- ----------------------------
+ * 0000 - No edge IRQ.
+ * 0001 - Falling edge IRQ.
+ * 0010 - Rising edge IRQ.
+ * 0011 - Rising and Falling edge IRQ.
+ * ------- ----------------------------
+ */
+
+#define ST_IRQ_EDGE_CONF_BITS_PER_PIN 4
+#define ST_IRQ_EDGE_MASK 0xf
+#define ST_IRQ_EDGE_FALLING BIT(0)
+#define ST_IRQ_EDGE_RISING BIT(1)
+#define ST_IRQ_EDGE_BOTH (BIT(0) | BIT(1))
+
+#define ST_IRQ_RISING_EDGE_CONF(pin) \
+ (ST_IRQ_EDGE_RISING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
+
+#define ST_IRQ_FALLING_EDGE_CONF(pin) \
+ (ST_IRQ_EDGE_FALLING << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
+
+#define ST_IRQ_BOTH_EDGE_CONF(pin) \
+ (ST_IRQ_EDGE_BOTH << (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN))
+
+#define ST_IRQ_EDGE_CONF(conf, pin) \
+ (conf >> (pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN) & ST_IRQ_EDGE_MASK)
+
struct st_gpio_bank {
struct gpio_chip gpio_chip;
struct pinctrl_gpio_range range;
void __iomem *base;
struct st_pio_control pc;
+ struct irq_domain *domain;
+ unsigned long irq_edge_conf;
+ spinlock_t lock;
};
struct st_pinctrl {
@@ -284,6 +337,7 @@ struct st_pinctrl {
int ngroups;
struct regmap *regmap;
const struct st_pctl_data *data;
+ void __iomem *irqmux_base;
};
/* SOC specific data */
@@ -330,12 +384,25 @@ static unsigned int stih416_delays[] = {0, 300, 500, 750, 1000, 1250, 1500,
static const struct st_pctl_data stih416_data = {
.rt_style = st_retime_style_dedicated,
.input_delays = stih416_delays,
- .ninput_delays = 14,
+ .ninput_delays = ARRAY_SIZE(stih416_delays),
.output_delays = stih416_delays,
- .noutput_delays = 14,
+ .noutput_delays = ARRAY_SIZE(stih416_delays),
.alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100,
};
+static const struct st_pctl_data stih407_flashdata = {
+ .rt_style = st_retime_style_none,
+ .input_delays = stih416_delays,
+ .ninput_delays = ARRAY_SIZE(stih416_delays),
+ .output_delays = stih416_delays,
+ .noutput_delays = ARRAY_SIZE(stih416_delays),
+ .alt = 0,
+ .oe = -1, /* Not Available */
+ .pu = -1, /* Not Available */
+ .od = 60,
+ .rt = 100,
+};
+
/* Low level functions.. */
static inline int st_gpio_bank(int gpio)
{
@@ -356,25 +423,29 @@ static void st_pinconf_set_config(struct st_pio_control *pc,
unsigned int oe_value, pu_value, od_value;
unsigned long mask = BIT(pin);
- regmap_field_read(output_enable, &oe_value);
- regmap_field_read(pull_up, &pu_value);
- regmap_field_read(open_drain, &od_value);
-
- /* Clear old values */
- oe_value &= ~mask;
- pu_value &= ~mask;
- od_value &= ~mask;
-
- if (config & ST_PINCONF_OE)
- oe_value |= mask;
- if (config & ST_PINCONF_PU)
- pu_value |= mask;
- if (config & ST_PINCONF_OD)
- od_value |= mask;
-
- regmap_field_write(output_enable, oe_value);
- regmap_field_write(pull_up, pu_value);
- regmap_field_write(open_drain, od_value);
+ if (output_enable) {
+ regmap_field_read(output_enable, &oe_value);
+ oe_value &= ~mask;
+ if (config & ST_PINCONF_OE)
+ oe_value |= mask;
+ regmap_field_write(output_enable, oe_value);
+ }
+
+ if (pull_up) {
+ regmap_field_read(pull_up, &pu_value);
+ pu_value &= ~mask;
+ if (config & ST_PINCONF_PU)
+ pu_value |= mask;
+ regmap_field_write(pull_up, pu_value);
+ }
+
+ if (open_drain) {
+ regmap_field_read(open_drain, &od_value);
+ od_value &= ~mask;
+ if (config & ST_PINCONF_OD)
+ od_value |= mask;
+ regmap_field_write(open_drain, od_value);
+ }
}
static void st_pctl_set_function(struct st_pio_control *pc,
@@ -385,6 +456,9 @@ static void st_pctl_set_function(struct st_pio_control *pc,
int pin = st_gpio_pin(pin_id);
int offset = pin * 4;
+ if (!alt)
+ return;
+
regmap_field_read(alt, &val);
val &= ~(0xf << offset);
val |= function << offset;
@@ -522,17 +596,23 @@ static void st_pinconf_get_direction(struct st_pio_control *pc,
{
unsigned int oe_value, pu_value, od_value;
- regmap_field_read(pc->oe, &oe_value);
- regmap_field_read(pc->pu, &pu_value);
- regmap_field_read(pc->od, &od_value);
+ if (pc->oe) {
+ regmap_field_read(pc->oe, &oe_value);
+ if (oe_value & BIT(pin))
+ ST_PINCONF_PACK_OE(*config);
+ }
- if (oe_value & BIT(pin))
- ST_PINCONF_PACK_OE(*config);
- if (pu_value & BIT(pin))
- ST_PINCONF_PACK_PU(*config);
- if (od_value & BIT(pin))
- ST_PINCONF_PACK_OD(*config);
+ if (pc->pu) {
+ regmap_field_read(pc->pu, &pu_value);
+ if (pu_value & BIT(pin))
+ ST_PINCONF_PACK_PU(*config);
+ }
+ if (pc->od) {
+ regmap_field_read(pc->od, &od_value);
+ if (od_value & BIT(pin))
+ ST_PINCONF_PACK_OD(*config);
+ }
}
static int st_pinconf_get_retime_packed(struct st_pinctrl *info,
@@ -1051,8 +1131,21 @@ static int st_pctl_dt_setup_retime(struct st_pinctrl *info,
return -EINVAL;
}
-static int st_parse_syscfgs(struct st_pinctrl *info,
- int bank, struct device_node *np)
+
+static struct regmap_field *st_pc_get_value(struct device *dev,
+ struct regmap *regmap, int bank,
+ int data, int lsb, int msb)
+{
+ struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb);
+
+ if (data < 0)
+ return NULL;
+
+ return devm_regmap_field_alloc(dev, regmap, reg);
+}
+
+static void st_parse_syscfgs(struct st_pinctrl *info, int bank,
+ struct device_node *np)
{
const struct st_pctl_data *data = info->data;
/**
@@ -1062,29 +1155,21 @@ static int st_parse_syscfgs(struct st_pinctrl *info,
*/
int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK;
int msb = lsb + ST_GPIO_PINS_PER_BANK - 1;
- struct reg_field alt_reg = REG_FIELD((data->alt + bank) * 4, 0, 31);
- struct reg_field oe_reg = REG_FIELD((data->oe + bank/4) * 4, lsb, msb);
- struct reg_field pu_reg = REG_FIELD((data->pu + bank/4) * 4, lsb, msb);
- struct reg_field od_reg = REG_FIELD((data->od + bank/4) * 4, lsb, msb);
struct st_pio_control *pc = &info->banks[bank].pc;
struct device *dev = info->dev;
struct regmap *regmap = info->regmap;
- pc->alt = devm_regmap_field_alloc(dev, regmap, alt_reg);
- pc->oe = devm_regmap_field_alloc(dev, regmap, oe_reg);
- pc->pu = devm_regmap_field_alloc(dev, regmap, pu_reg);
- pc->od = devm_regmap_field_alloc(dev, regmap, od_reg);
-
- if (IS_ERR(pc->alt) || IS_ERR(pc->oe) ||
- IS_ERR(pc->pu) || IS_ERR(pc->od))
- return -EINVAL;
+ pc->alt = st_pc_get_value(dev, regmap, bank, data->alt, 0, 31);
+ pc->oe = st_pc_get_value(dev, regmap, bank/4, data->oe, lsb, msb);
+ pc->pu = st_pc_get_value(dev, regmap, bank/4, data->pu, lsb, msb);
+ pc->od = st_pc_get_value(dev, regmap, bank/4, data->od, lsb, msb);
/* retime avaiable for all pins by default */
pc->rt_pin_mask = 0xff;
of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask);
st_pctl_dt_setup_retime(info, bank, pc);
- return 0;
+ return;
}
/*
@@ -1200,6 +1285,194 @@ static int st_pctl_parse_functions(struct device_node *np,
return 0;
}
+static int st_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
+ int irq = -ENXIO;
+
+ if (offset < chip->ngpio)
+ irq = irq_find_mapping(bank->domain, offset);
+
+ dev_info(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
+ chip->label, offset + chip->base, irq);
+ return irq;
+}
+
+static void st_gpio_irq_mask(struct irq_data *d)
+{
+ struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+
+ writel(BIT(d->hwirq), bank->base + REG_PIO_CLR_PMASK);
+}
+
+static void st_gpio_irq_unmask(struct irq_data *d)
+{
+ struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+
+ writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
+}
+
+static unsigned int st_gpio_irq_startup(struct irq_data *d)
+{
+ struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+
+ if (gpio_lock_as_irq(&bank->gpio_chip, d->hwirq))
+ dev_err(bank->gpio_chip.dev,
+ "unable to lock HW IRQ %lu for IRQ\n",
+ d->hwirq);
+
+ st_gpio_irq_unmask(d);
+
+ return 0;
+}
+
+static void st_gpio_irq_shutdown(struct irq_data *d)
+{
+ struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+
+ st_gpio_irq_mask(d);
+ gpio_unlock_as_irq(&bank->gpio_chip, d->hwirq);
+}
+
+static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
+{
+ struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+ unsigned long flags;
+ int comp, pin = d->hwirq;
+ u32 val;
+ u32 pin_edge_conf = 0;
+
+ switch (type) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ comp = 0;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ comp = 0;
+ pin_edge_conf = ST_IRQ_FALLING_EDGE_CONF(pin);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ comp = 1;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ comp = 1;
+ pin_edge_conf = ST_IRQ_RISING_EDGE_CONF(pin);
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ comp = st_gpio_get(&bank->gpio_chip, pin);
+ pin_edge_conf = ST_IRQ_BOTH_EDGE_CONF(pin);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&bank->lock, flags);
+ bank->irq_edge_conf &= ~(ST_IRQ_EDGE_MASK << (
+ pin * ST_IRQ_EDGE_CONF_BITS_PER_PIN));
+ bank->irq_edge_conf |= pin_edge_conf;
+ spin_unlock_irqrestore(&bank->lock, flags);
+
+ val = readl(bank->base + REG_PIO_PCOMP);
+ val &= ~BIT(pin);
+ val |= (comp << pin);
+ writel(val, bank->base + REG_PIO_PCOMP);
+
+ return 0;
+}
+
+/*
+ * As edge triggers are not supported at hardware level, it is supported by
+ * software by exploiting the level trigger support in hardware.
+ *
+ * Steps for detection raising edge interrupt in software.
+ *
+ * Step 1: CONFIGURE pin to detect level LOW interrupts.
+ *
+ * Step 2: DETECT level LOW interrupt and in irqmux/gpio bank interrupt handler,
+ * if the value of pin is low, then CONFIGURE pin for level HIGH interrupt.
+ * IGNORE calling the actual interrupt handler for the pin at this stage.
+ *
+ * Step 3: DETECT level HIGH interrupt and in irqmux/gpio-bank interrupt handler
+ * if the value of pin is HIGH, CONFIGURE pin for level LOW interrupt and then
+ * DISPATCH the interrupt to the interrupt handler of the pin.
+ *
+ * step-1 ________ __________
+ * | | step - 3
+ * | |
+ * step -2 |_____|
+ *
+ * falling edge is also detected int the same way.
+ *
+ */
+static void __gpio_irq_handler(struct st_gpio_bank *bank)
+{
+ unsigned long port_in, port_mask, port_comp, active_irqs;
+ unsigned long bank_edge_mask, flags;
+ int n, val, ecfg;
+
+ spin_lock_irqsave(&bank->lock, flags);
+ bank_edge_mask = bank->irq_edge_conf;
+ spin_unlock_irqrestore(&bank->lock, flags);
+
+ for (;;) {
+ port_in = readl(bank->base + REG_PIO_PIN);
+ port_comp = readl(bank->base + REG_PIO_PCOMP);
+ port_mask = readl(bank->base + REG_PIO_PMASK);
+
+ active_irqs = (port_in ^ port_comp) & port_mask;
+
+ if (active_irqs == 0)
+ break;
+
+ for_each_set_bit(n, &active_irqs, BITS_PER_LONG) {
+ /* check if we are detecting fake edges ... */
+ ecfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n);
+
+ if (ecfg) {
+ /* edge detection. */
+ val = st_gpio_get(&bank->gpio_chip, n);
+
+ writel(BIT(n),
+ val ? bank->base + REG_PIO_SET_PCOMP :
+ bank->base + REG_PIO_CLR_PCOMP);
+
+ if (ecfg != ST_IRQ_EDGE_BOTH &&
+ !((ecfg & ST_IRQ_EDGE_FALLING) ^ val))
+ continue;
+ }
+
+ generic_handle_irq(irq_find_mapping(bank->domain, n));
+ }
+ }
+}
+
+static void st_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ /* interrupt dedicated per bank */
+ struct irq_chip *chip = irq_get_chip(irq);
+ struct st_gpio_bank *bank = irq_get_handler_data(irq);
+
+ chained_irq_enter(chip, desc);
+ __gpio_irq_handler(bank);
+ chained_irq_exit(chip, desc);
+}
+
+static void st_gpio_irqmux_handler(unsigned irq, struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_get_chip(irq);
+ struct st_pinctrl *info = irq_get_handler_data(irq);
+ unsigned long status;
+ int n;
+
+ chained_irq_enter(chip, desc);
+
+ status = readl(info->irqmux_base);
+
+ for_each_set_bit(n, &status, ST_GPIO_PINS_PER_BANK)
+ __gpio_irq_handler(&info->banks[n]);
+
+ chained_irq_exit(chip, desc);
+}
+
static struct gpio_chip st_gpio_template = {
.request = st_gpio_request,
.free = st_gpio_free,
@@ -1210,6 +1483,34 @@ static struct gpio_chip st_gpio_template = {
.ngpio = ST_GPIO_PINS_PER_BANK,
.of_gpio_n_cells = 1,
.of_xlate = st_gpio_xlate,
+ .to_irq = st_gpio_to_irq,
+};
+
+static struct irq_chip st_gpio_irqchip = {
+ .name = "GPIO",
+ .irq_mask = st_gpio_irq_mask,
+ .irq_unmask = st_gpio_irq_unmask,
+ .irq_set_type = st_gpio_irq_set_type,
+ .irq_startup = st_gpio_irq_startup,
+ .irq_shutdown = st_gpio_irq_shutdown,
+};
+
+static int st_gpio_irq_domain_map(struct irq_domain *h,
+ unsigned int virq, irq_hw_number_t hw)
+{
+ struct st_gpio_bank *bank = h->host_data;
+
+ irq_set_chip(virq, &st_gpio_irqchip);
+ irq_set_handler(virq, handle_simple_irq);
+ set_irq_flags(virq, IRQF_VALID);
+ irq_set_chip_data(virq, bank);
+
+ return 0;
+}
+
+static struct irq_domain_ops st_gpio_irq_ops = {
+ .map = st_gpio_irq_domain_map,
+ .xlate = irq_domain_xlate_twocell,
};
static int st_gpiolib_register_bank(struct st_pinctrl *info,
@@ -1219,8 +1520,8 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,
struct pinctrl_gpio_range *range = &bank->range;
struct device *dev = info->dev;
int bank_num = of_alias_get_id(np, "gpio");
- struct resource res;
- int err;
+ struct resource res, irq_res;
+ int gpio_irq = 0, err, i;
if (of_address_to_resource(np, 0, &res))
return -ENODEV;
@@ -1233,6 +1534,7 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,
bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK;
bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK;
bank->gpio_chip.of_node = np;
+ spin_lock_init(&bank->lock);
of_property_read_string(np, "st,bank-name", &range->name);
bank->gpio_chip.label = range->name;
@@ -1248,6 +1550,51 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,
}
dev_info(dev, "%s bank added.\n", range->name);
+ /**
+ * GPIO bank can have one of the two possible types of
+ * interrupt-wirings.
+ *
+ * First type is via irqmux, single interrupt is used by multiple
+ * gpio banks. This reduces number of overall interrupts numbers
+ * required. All these banks belong to a single pincontroller.
+ * _________
+ * | |----> [gpio-bank (n) ]
+ * | |----> [gpio-bank (n + 1)]
+ * [irqN]-- | irq-mux |----> [gpio-bank (n + 2)]
+ * | |----> [gpio-bank (... )]
+ * |_________|----> [gpio-bank (n + 7)]
+ *
+ * Second type has a dedicated interrupt per each gpio bank.
+ *
+ * [irqN]----> [gpio-bank (n)]
+ */
+
+ if (of_irq_to_resource(np, 0, &irq_res)) {
+ gpio_irq = irq_res.start;
+ irq_set_chained_handler(gpio_irq, st_gpio_irq_handler);
+ irq_set_handler_data(gpio_irq, bank);
+ }
+
+ if (info->irqmux_base > 0 || gpio_irq > 0) {
+ /* Setup IRQ domain */
+ bank->domain = irq_domain_add_linear(np,
+ ST_GPIO_PINS_PER_BANK,
+ &st_gpio_irq_ops, bank);
+ if (!bank->domain) {
+ dev_err(dev, "Failed to add irq domain for %s\n",
+ np->full_name);
+ } else {
+ for (i = 0; i < ST_GPIO_PINS_PER_BANK; i++) {
+ if (irq_create_mapping(bank->domain, i) < 0)
+ dev_err(dev,
+ "Failed to map IRQ %i\n", i);
+ }
+ }
+
+ } else {
+ dev_info(dev, "No IRQ support for %s bank\n", np->full_name);
+ }
+
return 0;
}
@@ -1264,6 +1611,10 @@ static struct of_device_id st_pctl_of_match[] = {
{ .compatible = "st,stih416-rear-pinctrl", .data = &stih416_data},
{ .compatible = "st,stih416-fvdp-fe-pinctrl", .data = &stih416_data},
{ .compatible = "st,stih416-fvdp-lite-pinctrl", .data = &stih416_data},
+ { .compatible = "st,stih407-sbc-pinctrl", .data = &stih416_data},
+ { .compatible = "st,stih407-front-pinctrl", .data = &stih416_data},
+ { .compatible = "st,stih407-rear-pinctrl", .data = &stih416_data},
+ { .compatible = "st,stih407-flash-pinctrl", .data = &stih407_flashdata},
{ /* sentinel */ }
};
@@ -1276,6 +1627,8 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
int grp_index = 0;
+ int irq = 0;
+ struct resource *res;
st_pctl_dt_child_count(info, np);
if (!info->nbanks) {
@@ -1306,6 +1659,21 @@ static int st_pctl_probe_dt(struct platform_device *pdev,
}
info->data = of_match_node(st_pctl_of_match, np)->data;
+ irq = platform_get_irq(pdev, 0);
+
+ if (irq > 0) {
+ res = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, "irqmux");
+ info->irqmux_base = devm_ioremap_resource(&pdev->dev, res);
+
+ if (IS_ERR(info->irqmux_base))
+ return PTR_ERR(info->irqmux_base);
+
+ irq_set_chained_handler(irq, st_gpio_irqmux_handler);
+ irq_set_handler_data(irq, info);
+
+ }
+
pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK;
pdesc = devm_kzalloc(&pdev->dev,
sizeof(*pdesc) * pctl_desc->npins, GFP_KERNEL);
generated by cgit (git 2.34.1) at 2024-07-04 22:31:48 +0000