[PATCH v5 4/5] ARM: mediatek: Add EINT support to MTK pinctrl driver.

Hongzhou Yang
2015-01-21T05:28:16Z

From: Maoguang Meng <maoguang.meng@mediatek.com>

MTK SoC support external interrupt(EINT) from most SoC pins.
Add EINT support to pinctrl driver.

Signed-off-by: Maoguang Meng <maoguang.meng@mediatek.com>
Signed-off-by: Hongzhou Yang <hongzhou.yang@mediatek.com>
---
drivers/pinctrl/mediatek/pinctrl-mt8135.c | 23 ++
drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 379 +++++++++++++++++++++++++-
drivers/pinctrl/mediatek/pinctrl-mtk-common.h | 35 ++-
3 files changed, 435 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mt8135.c b/drivers/pinctrl/mediatek/pinctrl-mt8135.c
index 13694b8..b6ee2b2 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mt8135.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt8135.c
@@ -314,6 +314,29 @@ static const struct mtk_pinctrl_devdata mt8135_pinctrl_data = {
.port_shf = 4,
.port_mask = 0xf,
.port_align = 4,
+ .chip_type = MTK_CHIP_TYPE_BASE,
+ .eint_offsets = {
+ .name = "mt8135_eint",
+ .stat = 0x000,
+ .ack = 0x040,
+ .mask = 0x080,
+ .mask_set = 0x0c0,
+ .mask_clr = 0x100,
+ .sens = 0x140,
+ .sens_set = 0x180,
+ .sens_clr = 0x1c0,
+ .pol = 0x300,
+ .pol_set = 0x340,
+ .pol_clr = 0x380,
+ .dom_en = 0x400,
+ .dbnc_ctrl = 0x500,
+ .dbnc_set = 0x600,
+ .dbnc_clr = 0x700,
+ .port_mask = 7,
+ .ports = 6,
+ },
+ .ap_num = 192,
+ .db_cnt = 16,
};

static int mt8135_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 5d680c8..7e113e1 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -31,6 +31,7 @@
#include <linux/bitops.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
+#include <linux/delay.h>
#include <dt-bindings/pinctrl/mt65xx.h>

#include "../core.h"
@@ -560,6 +561,21 @@ static int mtk_pmx_set_mode(struct pinctrl_dev *pctldev,
reg_addr, mask, val);
}

+static const struct mtk_desc_pin *
+mtk_find_pin_by_eint_num(struct mtk_pinctrl *pctl, unsigned int eint_num)
+{
+ int i;
+ const struct mtk_desc_pin *pin;
+
+ for (i = 0; i < pctl->devdata->npins; i++) {
+ pin = pctl->devdata->pins + i;
+ if (pin->eint.eintnum == eint_num)
+ return pin;
+ }
+
+ return NULL;
+}
+
static int mtk_pmx_set_mux(struct pinctrl_dev *pctldev,
unsigned function,
unsigned group)
@@ -647,6 +663,199 @@ static int mtk_gpio_get(struct gpio_chip *chip, unsigned offset)
return !!(read_val & bit);
}

+static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ const struct mtk_desc_pin *pin;
+ struct mtk_pinctrl *pctl = dev_get_drvdata(chip->dev);
+ int irq;
+
+ pin = pctl->devdata->pins + offset;
+ if (pin->eint.eintnum == NO_EINT_SUPPORT)
+ return -EINVAL;
+
+ irq = irq_find_mapping(pctl->domain, pin->eint.eintnum);
+ if (!irq)
+ return -EINVAL;
+
+ return irq;
+}
+
+static int mtk_pinctrl_irq_request_resources(struct irq_data *d)
+{
+ struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
+ const struct mtk_desc_pin *pin;
+ int ret;
+
+ pin = mtk_find_pin_by_eint_num(pctl, d->hwirq);
+
+ if (!pin) {
+ dev_err(pctl->dev, "Can not find pin\n");
+ return -EINVAL;
+ }
+
+ ret = gpiochip_lock_as_irq(pctl->chip, pin->pin.number);
+ if (ret) {
+ dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
+ irqd_to_hwirq(d));
+ return ret;
+ }
+
+ /* set mux to INT mode */
+ mtk_pmx_set_mode(pctl->pctl_dev, pin->pin.number, pin->eint.eintmux);
+
+ return 0;
+}
+
+static void mtk_pinctrl_irq_release_resources(struct irq_data *d)
+{
+ struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
+ const struct mtk_desc_pin *pin;
+
+ pin = mtk_find_pin_by_eint_num(pctl, d->hwirq);
+
+ if (!pin) {
+ dev_err(pctl->dev, "Can not find pin\n");
+ return;
+ }
+
+ gpiochip_unlock_as_irq(pctl->chip, pin->pin.number);
+}
+
+static void __iomem *mtk_eint_get_offset(struct mtk_pinctrl *pctl,
+ unsigned int eint_num, unsigned int offset)
+{
+ unsigned int eint_base = 0;
+ void __iomem *reg;
+
+ if (eint_num >= pctl->devdata->ap_num)
+ eint_base = pctl->devdata->ap_num;
+
+ reg = pctl->eint_reg_base + offset + ((eint_num - eint_base) / 32) * 4;
+
+ return reg;
+}
+
+/*
+ * mtk_can_en_debounce: Check the EINT number is able to enable debounce or not
+ * @eint_num: the EINT number to setmtk_pinctrl
+ */
+static unsigned int mtk_eint_can_en_debounce(struct mtk_pinctrl *pctl,
+ unsigned int eint_num)
+{
+ unsigned int sens;
+ unsigned int bit = BIT(eint_num % 32);
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+
+ void __iomem *reg = mtk_eint_get_offset(pctl, eint_num,
+ eint_offsets->sens);
+
+ if (readl(reg) & bit)
+ sens = MT_LEVEL_SENSITIVE;
+ else
+ sens = MT_EDGE_SENSITIVE;
+
+ if ((eint_num < pctl->devdata->db_cnt) && (sens != MT_EDGE_SENSITIVE))
+ return 1;
+ else
+ return 0;
+}
+
+/*
+ * mtk_eint_get_mask: To get the eint mask
+ * @eint_num: the EINT number to get
+ */
+static unsigned int mtk_eint_get_mask(struct mtk_pinctrl *pctl,
+ unsigned int eint_num)
+{
+ unsigned int bit = BIT(eint_num % 32);
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+
+ void __iomem *reg = mtk_eint_get_offset(pctl, eint_num,
+ eint_offsets->mask);
+
+ return !!(readl(reg) & bit);
+}
+
+static void mtk_eint_mask(struct irq_data *d)
+{
+ struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+ u32 mask = BIT(d->hwirq & 0x1f);
+ void __iomem *reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->mask_set);
+
+ writel(mask, reg);
+}
+
+static void mtk_eint_unmask(struct irq_data *d)
+{
+ struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+ u32 mask = BIT(d->hwirq & 0x1f);
+ void __iomem *reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->mask_clr);
+
+ writel(mask, reg);
+}
+
+static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
+ unsigned debounce)
+{
+ struct mtk_pinctrl *pctl = dev_get_drvdata(chip->dev);
+ int eint_num, virq, eint_offset;
+ unsigned int set_offset, bit, clr_bit, clr_offset, rst, i, unmask, dbnc;
+ static const unsigned int dbnc_arr[] = {0 , 1, 16, 32, 64, 128, 256};
+ const struct mtk_desc_pin *pin;
+ struct irq_data *d;
+
+ pin = pctl->devdata->pins + offset;
+ if (pin->eint.eintnum == NO_EINT_SUPPORT)
+ return -EINVAL;
+
+ eint_num = pin->eint.eintnum;
+ virq = irq_find_mapping(pctl->domain, eint_num);
+ eint_offset = (eint_num % 4) * 8;
+ d = irq_get_irq_data(virq);
+
+ set_offset = (eint_num / 4) * 4 + pctl->devdata->eint_offsets.dbnc_set;
+ clr_offset = (eint_num / 4) * 4 + pctl->devdata->eint_offsets.dbnc_clr;
+ if (!mtk_eint_can_en_debounce(pctl, eint_num))
+ return -ENOSYS;
+
+ dbnc = ARRAY_SIZE(dbnc_arr);
+ for (i = 0; i < ARRAY_SIZE(dbnc_arr); i++) {
+ if (debounce <= dbnc_arr[i]) {
+ dbnc = i;
+ break;
+ }
+ }
+
+ if (!mtk_eint_get_mask(pctl, eint_num)) {
+ mtk_eint_mask(d);
+ unmask = 1;
+ }
+
+ clr_bit = 0xff << eint_offset;
+ writel(clr_bit, pctl->eint_reg_base + clr_offset);
+
+ bit = ((dbnc << EINT_DBNC_SET_DBNC_BITS) | EINT_DBNC_SET_EN) <<
+ eint_offset;
+ rst = EINT_DBNC_RST_BIT << eint_offset;
+ writel(rst | bit, pctl->eint_reg_base + set_offset);
+
+ /* Delay a while (more than 2T) to wait for hw debounce counter reset
+ work correctly */
+ udelay(1);
+ if (unmask == 1)
+ mtk_eint_unmask(d);
+
+ return 0;
+}
+
static struct gpio_chip mtk_gpio_chip = {
.owner = THIS_MODULE,
.request = mtk_gpio_request,
@@ -655,9 +864,134 @@ static struct gpio_chip mtk_gpio_chip = {
.direction_output = mtk_gpio_direction_output,
.get = mtk_gpio_get,
.set = mtk_gpio_set,
+ .to_irq = mtk_gpio_to_irq,
+ .set_debounce = mtk_gpio_set_debounce,
.of_gpio_n_cells = 2,
};

+static int mtk_eint_set_type(struct irq_data *d,
+ unsigned int type)
+{
+ struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+ u32 mask = BIT(d->hwirq & 0x1f);
+ void __iomem *reg;
+
+ if (((type & IRQ_TYPE_EDGE_BOTH) && (type & IRQ_TYPE_LEVEL_MASK)) ||
+ ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) ||
+ ((type & IRQ_TYPE_LEVEL_MASK) == IRQ_TYPE_LEVEL_MASK)) {
+ dev_err(pctl->dev, "Can't configure IRQ%d (EINT%lu) for type 0x%X\n",
+ d->irq, d->hwirq, type);
+ return -EINVAL;
+ }
+
+ if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) {
+ reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->pol_clr);
+ writel(mask, reg);
+ } else {
+ reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->pol_set);
+ writel(mask, reg);
+ }
+
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+ reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->sens_clr);
+ writel(mask, reg);
+ } else {
+ reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->sens_set);
+ writel(mask, reg);
+ }
+
+ return 0;
+}
+
+static void mtk_eint_ack(struct irq_data *d)
+{
+ struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d);
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+ u32 mask = BIT(d->hwirq & 0x1f);
+ void __iomem *reg = mtk_eint_get_offset(pctl, d->hwirq,
+ eint_offsets->ack);
+
+ writel(mask, reg);
+}
+
+static struct irq_chip mtk_pinctrl_irq_chip = {
+ .name = "mt-eint",
+ .irq_mask = mtk_eint_mask,
+ .irq_unmask = mtk_eint_unmask,
+ .irq_ack = mtk_eint_ack,
+ .irq_set_type = mtk_eint_set_type,
+ .irq_request_resources = mtk_pinctrl_irq_request_resources,
+ .irq_release_resources = mtk_pinctrl_irq_release_resources,
+};
+
+static unsigned int mtk_eint_init(struct mtk_pinctrl *pctl)
+{
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+ void __iomem *reg = pctl->eint_reg_base + eint_offsets->dom_en;
+ unsigned int i;
+
+ for (i = 0; i < pctl->devdata->ap_num; i += 32) {
+ writel(0xffffffff, reg);
+ reg += 4;
+ }
+ return 0;
+}
+
+static inline void
+mtk_eint_debounce_process(struct mtk_pinctrl *pctl, int index)
+{
+ unsigned int rst, ctrl_offset;
+ unsigned int bit, dbnc;
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+
+ ctrl_offset = (index / 4) * 4 + eint_offsets->dbnc_ctrl;
+ dbnc = readl(pctl->eint_reg_base + ctrl_offset);
+ bit = EINT_DBNC_SET_EN << ((index % 4) * 8);
+ if ((bit & dbnc) > 0) {
+ ctrl_offset = (index / 4) * 4 + eint_offsets->dbnc_set;
+ rst = EINT_DBNC_RST_BIT << ((index % 4) * 8);
+ writel(rst, pctl->eint_reg_base + ctrl_offset);
+ }
+}
+
+static void mtk_eint_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_get_chip(irq);
+ struct mtk_pinctrl *pctl = irq_get_handler_data(irq);
+ unsigned int status, eint_num;
+ int offset, index, virq;
+ const struct mtk_eint_offsets *eint_offsets =
+ &pctl->devdata->eint_offsets;
+ void __iomem *reg = mtk_eint_get_offset(pctl, 0, eint_offsets->stat);
+
+ chained_irq_enter(chip, desc);
+ for (eint_num = 0; eint_num < pctl->devdata->ap_num; eint_num += 32) {
+ status = readl(reg);
+ reg += 4;
+ while (status) {
+ offset = __ffs(status);
+ index = eint_num + offset;
+ virq = irq_find_mapping(pctl->domain, index);
+ status &= ~BIT(offset);
+
+ generic_handle_irq(virq);
+
+ if (index < pctl->devdata->db_cnt)
+ mtk_eint_debounce_process(pctl , index);
+ }
+ }
+ chained_irq_exit(chip, desc);
+}
+
static int mtk_pctrl_build_state(struct platform_device *pdev)
{
struct mtk_pinctrl *pctl = platform_get_drvdata(pdev);
@@ -705,7 +1039,8 @@ int mtk_pctrl_init(struct platform_device *pdev,
struct mtk_pinctrl *pctl;
struct device_node *np = pdev->dev.of_node, *node;
struct property *prop;
- int i, ret;
+ struct resource *res;
+ int i, ret, irq;

pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
if (!pctl)
@@ -786,6 +1121,48 @@ int mtk_pctrl_init(struct platform_device *pdev,
goto chip_error;
}

+ /* Get EINT register base from dts. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Unable to get Pinctrl resource\n");
+ ret = -EINVAL;
+ goto chip_error;
+ }
+
+ pctl->eint_reg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pctl->eint_reg_base)) {
+ ret = -EINVAL;
+ goto chip_error;
+ }
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (!irq) {
+ dev_err(&pdev->dev, "couldn't parse and map irq\n");
+ ret = -EINVAL;
+ goto chip_error;
+ }
+
+ pctl->domain = irq_domain_add_linear(np,
+ pctl->devdata->ap_num, &irq_domain_simple_ops, NULL);
+ if (!pctl->domain) {
+ dev_err(&pdev->dev, "Couldn't register IRQ domain\n");
+ ret = -ENOMEM;
+ goto chip_error;
+ }
+
+ mtk_eint_init(pctl);
+ for (i = 0; i < pctl->devdata->ap_num; i++) {
+ int virq = irq_create_mapping(pctl->domain, i);
+
+ irq_set_chip_and_handler(virq, &mtk_pinctrl_irq_chip,
+ handle_level_irq);
+ irq_set_chip_data(virq, pctl);
+ set_irq_flags(virq, IRQF_VALID);
+ };
+
+ irq_set_chained_handler(irq, mtk_eint_irq_handler);
+ irq_set_handler_data(irq, pctl);
+ set_irq_flags(irq, IRQF_VALID);
return 0;

chip_error:
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
index 95a9d57..8d7d32b 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h
@@ -16,10 +16,16 @@
#define __PINCTRL_MTK_COMMON_H

#include <linux/pinctrl/pinctrl.h>
-#include <linux/spinlock.h>
#include <linux/regmap.h>

#define NO_EINT_SUPPORT 255
+#define MTK_CHIP_TYPE_BASE 0
+#define MTK_CHIP_TYPE_PMIC 1
+#define MT_EDGE_SENSITIVE 0
+#define MT_LEVEL_SENSITIVE 1
+#define EINT_DBNC_SET_DBNC_BITS 4
+#define EINT_DBNC_RST_BIT (0x1 << 1)
+#define EINT_DBNC_SET_EN (0x1 << 0)

struct mtk_desc_function {
const char *name;
@@ -115,6 +121,27 @@ struct mtk_pin_drv_grp {
.grp = _grp, \
}

+struct mtk_eint_offsets {
+ const char *name;
+ unsigned int stat;
+ unsigned int ack;
+ unsigned int mask;
+ unsigned int mask_set;
+ unsigned int mask_clr;
+ unsigned int sens;
+ unsigned int sens_set;
+ unsigned int sens_clr;
+ unsigned int pol;
+ unsigned int pol_set;
+ unsigned int pol_clr;
+ unsigned int dom_en;
+ unsigned int dbnc_ctrl;
+ unsigned int dbnc_set;
+ unsigned int dbnc_clr;
+ u8 port_mask;
+ u8 ports;
+};
+
/**
* struct mtk_pinctrl_devdata - Provide HW GPIO related data.
* @pins: An array describing all pins the pin controller affects.
@@ -165,6 +192,10 @@ struct mtk_pinctrl_devdata {
unsigned char port_shf;
unsigned char port_mask;
unsigned char port_align;
+ unsigned char chip_type;
+ struct mtk_eint_offsets eint_offsets;
+ unsigned int ap_num;
+ unsigned int db_cnt;
};

struct mtk_pinctrl {
@@ -177,6 +208,8 @@ struct mtk_pinctrl {
const char **grp_names;
struct pinctrl_dev *pctl_dev;
const struct mtk_pinctrl_devdata *devdata;
+ void __iomem *eint_reg_base;
+ struct irq_domain *domain;
};

int mtk_pctrl_init(struct platform_device *pdev,
--
1.8.1.1.dirty