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Subject[PATCH 16/16] gpio: tegra186: Use banked GPIO infrastructure
Date
From: Thierry Reding <treding@nvidia.com>

Convert the Tegra186 GPIO driver to use the banked GPIO infrastructure,
which simplifies some parts of the driver.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/gpio/gpio-tegra186.c | 211 ++++++++++++++++---------------------------
1 file changed, 79 insertions(+), 132 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 162dc6b41ae8..4926b98a05f6 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -13,6 +13,7 @@
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/platform_device.h>

#include <dt-bindings/gpio/tegra186-gpio.h>
@@ -44,15 +45,27 @@

#define TEGRA186_GPIO_INTERRUPT_STATUS(x) (0x100 + (x) * 4)

-struct tegra_gpio_port {
+struct tegra_gpio_port_soc {
const char *name;
unsigned int offset;
unsigned int pins;
unsigned int irq;
};

+struct tegra_gpio_port {
+ struct gpio_bank bank;
+ unsigned int offset;
+ const char *name;
+};
+
+static inline struct tegra_gpio_port *
+to_tegra_gpio_port(struct gpio_bank *bank)
+{
+ return container_of(bank, struct tegra_gpio_port, bank);
+}
+
struct tegra_gpio_soc {
- const struct tegra_gpio_port *ports;
+ const struct tegra_gpio_port_soc *ports;
unsigned int num_ports;
const char *name;
};
@@ -60,21 +73,21 @@ struct tegra_gpio_soc {
struct tegra_gpio {
struct gpio_chip gpio;
struct irq_chip intc;
- unsigned int num_irq;
- unsigned int *irq;

const struct tegra_gpio_soc *soc;

+ struct tegra_gpio_port *ports;
+
void __iomem *base;
};

-static const struct tegra_gpio_port *
+static const struct tegra_gpio_port_soc *
tegra186_gpio_get_port(struct tegra_gpio *gpio, unsigned int *pin)
{
unsigned int start = 0, i;

for (i = 0; i < gpio->soc->num_ports; i++) {
- const struct tegra_gpio_port *port = &gpio->soc->ports[i];
+ const struct tegra_gpio_port_soc *port = &gpio->soc->ports[i];

if (*pin >= start && *pin < start + port->pins) {
*pin -= start;
@@ -90,7 +103,7 @@ tegra186_gpio_get_port(struct tegra_gpio *gpio, unsigned int *pin)
static void __iomem *tegra186_gpio_get_base(struct tegra_gpio *gpio,
unsigned int pin)
{
- const struct tegra_gpio_port *port;
+ const struct tegra_gpio_port_soc *port;

port = tegra186_gpio_get_port(gpio, &pin);
if (!port)
@@ -206,39 +219,10 @@ static void tegra186_gpio_set(struct gpio_chip *chip, unsigned int offset,
writel(value, base + TEGRA186_GPIO_OUTPUT_VALUE);
}

-static int tegra186_gpio_of_xlate(struct gpio_chip *chip,
- const struct of_phandle_args *spec,
- u32 *flags)
-{
- struct tegra_gpio *gpio = gpiochip_get_data(chip);
- unsigned int port, pin, i, offset = 0;
-
- if (WARN_ON(chip->of_gpio_n_cells < 2))
- return -EINVAL;
-
- if (WARN_ON(spec->args_count < chip->of_gpio_n_cells))
- return -EINVAL;
-
- port = spec->args[0] / 8;
- pin = spec->args[0] % 8;
-
- if (port >= gpio->soc->num_ports) {
- dev_err(chip->parent, "invalid port number: %u\n", port);
- return -EINVAL;
- }
-
- for (i = 0; i < port; i++)
- offset += gpio->soc->ports[i].pins;
-
- if (flags)
- *flags = spec->args[1];
-
- return offset + pin;
-}
-
static void tegra186_irq_ack(struct irq_data *data)
{
- struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct tegra_gpio *gpio = gpiochip_get_data(chip);
void __iomem *base;

base = tegra186_gpio_get_base(gpio, data->hwirq);
@@ -250,7 +234,8 @@ static void tegra186_irq_ack(struct irq_data *data)

static void tegra186_irq_mask(struct irq_data *data)
{
- struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct tegra_gpio *gpio = gpiochip_get_data(chip);
void __iomem *base;
u32 value;

@@ -265,7 +250,8 @@ static void tegra186_irq_mask(struct irq_data *data)

static void tegra186_irq_unmask(struct irq_data *data)
{
- struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct tegra_gpio *gpio = gpiochip_get_data(chip);
void __iomem *base;
u32 value;

@@ -280,7 +266,8 @@ static void tegra186_irq_unmask(struct irq_data *data)

static int tegra186_irq_set_type(struct irq_data *data, unsigned int flow)
{
- struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data);
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct tegra_gpio *gpio = gpiochip_get_data(chip);
void __iomem *base;
u32 value;

@@ -332,76 +319,22 @@ static int tegra186_irq_set_type(struct irq_data *data, unsigned int flow)
return 0;
}

-static void tegra186_gpio_irq(struct irq_desc *desc)
-{
- struct tegra_gpio *gpio = irq_desc_get_handler_data(desc);
- struct irq_domain *domain = gpio->gpio.irq.domain;
- struct irq_chip *chip = irq_desc_get_chip(desc);
- unsigned int parent = irq_desc_get_irq(desc);
- unsigned int i, offset = 0;
-
- chained_irq_enter(chip, desc);
-
- for (i = 0; i < gpio->soc->num_ports; i++) {
- const struct tegra_gpio_port *port = &gpio->soc->ports[i];
- void __iomem *base = gpio->base + port->offset;
- unsigned int pin, irq;
- unsigned long value;
-
- /* skip ports that are not associated with this controller */
- if (parent != gpio->irq[port->irq])
- goto skip;
-
- value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));
-
- for_each_set_bit(pin, &value, port->pins) {
- irq = irq_find_mapping(domain, offset + pin);
- if (WARN_ON(irq == 0))
- continue;
-
- generic_handle_irq(irq);
- }
-
-skip:
- offset += port->pins;
- }
-
- chained_irq_exit(chip, desc);
-}
-
-static int tegra186_gpio_irq_domain_xlate(struct irq_domain *domain,
- struct device_node *np,
- const u32 *spec, unsigned int size,
- unsigned long *hwirq,
- unsigned int *type)
+static void tegra186_gpio_update_bank(struct gpio_bank *bank)
{
- struct tegra_gpio *gpio = gpiochip_get_data(domain->host_data);
- unsigned int port, pin, i, offset = 0;
-
- if (size < 2)
- return -EINVAL;
-
- port = spec[0] / 8;
- pin = spec[0] % 8;
-
- if (port >= gpio->soc->num_ports) {
- dev_err(gpio->gpio.parent, "invalid port number: %u\n", port);
- return -EINVAL;
- }
-
- for (i = 0; i < port; i++)
- offset += gpio->soc->ports[i].pins;
+ struct tegra_gpio_port *port = to_tegra_gpio_port(bank);
+ struct tegra_gpio *gpio = gpiochip_get_data(bank->chip);
+ void __iomem *base = gpio->base + port->offset;
+ u32 value;

- *type = spec[1] & IRQ_TYPE_SENSE_MASK;
- *hwirq = offset + pin;
+ value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));

- return 0;
+ bank->pending[0] = value;
}

static const struct irq_domain_ops tegra186_gpio_irq_domain_ops = {
.map = gpiochip_irq_map,
.unmap = gpiochip_irq_unmap,
- .xlate = tegra186_gpio_irq_domain_xlate,
+ .xlate = gpio_banked_irq_domain_xlate,
};

static struct lock_class_key tegra186_gpio_lock_class;
@@ -420,6 +353,7 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
return -ENOMEM;

gpio->soc = of_device_get_match_data(&pdev->dev);
+ irq = &gpio->gpio.irq;

res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gpio");
gpio->base = devm_ioremap_resource(&pdev->dev, res);
@@ -430,21 +364,47 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
if (err < 0)
return err;

- gpio->num_irq = err;
+ irq->num_parents = err;

- gpio->irq = devm_kcalloc(&pdev->dev, gpio->num_irq, sizeof(*gpio->irq),
- GFP_KERNEL);
- if (!gpio->irq)
+ irq->parents = devm_kcalloc(&pdev->dev, irq->num_parents,
+ sizeof(*irq->parents), GFP_KERNEL);
+ if (!irq->parents)
return -ENOMEM;

- for (i = 0; i < gpio->num_irq; i++) {
+ for (i = 0; i < irq->num_parents; i++) {
err = platform_get_irq(pdev, i);
if (err < 0)
return err;

- gpio->irq[i] = err;
+ irq->parents[i] = err;
}

+ gpio->ports = devm_kcalloc(&pdev->dev, gpio->soc->num_ports,
+ sizeof(struct tegra_gpio_port),
+ GFP_KERNEL);
+ if (!gpio->ports)
+ return -ENOMEM;
+
+ gpio->gpio.banks = devm_kcalloc(&pdev->dev, gpio->soc->num_ports,
+ sizeof(struct gpio_bank *),
+ GFP_KERNEL);
+ if (!gpio->gpio.banks)
+ return -ENOMEM;
+
+ for (i = 0; i < gpio->soc->num_ports; i++) {
+ const struct tegra_gpio_port_soc *soc = &gpio->soc->ports[i];
+ struct tegra_gpio_port *port = &gpio->ports[i];
+
+ gpio->gpio.banks[i] = &port->bank;
+ port->bank.parent_irq = soc->irq;
+ port->bank.num_pins = soc->pins;
+
+ port->offset = soc->offset;
+ port->name = soc->name;
+ }
+
+ gpio->gpio.num_banks = gpio->soc->num_ports;
+
gpio->gpio.label = gpio->soc->name;
gpio->gpio.parent = &pdev->dev;

@@ -465,7 +425,7 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
return -ENOMEM;

for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
- const struct tegra_gpio_port *port = &gpio->soc->ports[i];
+ const struct tegra_gpio_port_soc *port = &gpio->soc->ports[i];
char *name;

for (j = 0; j < port->pins; j++) {
@@ -484,7 +444,11 @@ static int tegra186_gpio_probe(struct platform_device *pdev)

gpio->gpio.of_node = pdev->dev.of_node;
gpio->gpio.of_gpio_n_cells = 2;
- gpio->gpio.of_xlate = tegra186_gpio_of_xlate;
+ gpio->gpio.of_gpio_bank_shift = 3;
+ gpio->gpio.of_gpio_bank_mask = 0x1fffffff;
+ gpio->gpio.of_gpio_pin_shift = 0;
+ gpio->gpio.of_gpio_pin_mask = 0x7;
+ gpio->gpio.of_xlate = of_gpio_banked_xlate;

gpio->intc.name = pdev->dev.of_node->name;
gpio->intc.irq_ack = tegra186_irq_ack;
@@ -492,31 +456,14 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
gpio->intc.irq_unmask = tegra186_irq_unmask;
gpio->intc.irq_set_type = tegra186_irq_set_type;

- irq = &gpio->gpio.irq;
irq->chip = &gpio->intc;
irq->first = 0;
irq->domain_ops = &tegra186_gpio_irq_domain_ops;
irq->handler = handle_simple_irq;
irq->lock_key = &tegra186_gpio_lock_class;
irq->default_type = IRQ_TYPE_NONE;
- irq->parent_handler = tegra186_gpio_irq;
- irq->parent_handler_data = gpio;
- irq->num_parents = gpio->num_irq;
- irq->parents = gpio->irq;
-
- irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
- sizeof(*irq->map), GFP_KERNEL);
- if (!irq->map)
- return -ENOMEM;
-
- for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
- const struct tegra_gpio_port *port = &gpio->soc->ports[i];
-
- for (j = 0; j < port->pins; j++)
- irq->map[offset + j] = irq->parents[port->irq];
-
- offset += port->pins;
- }
+ irq->parent_handler = gpio_irq_chip_banked_handler;
+ irq->update_bank = tegra186_gpio_update_bank;

platform_set_drvdata(pdev, gpio);

@@ -540,7 +487,7 @@ static int tegra186_gpio_remove(struct platform_device *pdev)
.irq = controller, \
}

-static const struct tegra_gpio_port tegra186_main_ports[] = {
+static const struct tegra_gpio_port_soc tegra186_main_ports[] = {
TEGRA_MAIN_GPIO_PORT( A, 0x2000, 7, 2),
TEGRA_MAIN_GPIO_PORT( B, 0x3000, 7, 3),
TEGRA_MAIN_GPIO_PORT( C, 0x3200, 7, 3),
@@ -580,7 +527,7 @@ static const struct tegra_gpio_soc tegra186_main_soc = {
.irq = controller, \
}

-static const struct tegra_gpio_port tegra186_aon_ports[] = {
+static const struct tegra_gpio_port_soc tegra186_aon_ports[] = {
TEGRA_AON_GPIO_PORT( S, 0x0200, 5, 0),
TEGRA_AON_GPIO_PORT( U, 0x0400, 6, 0),
TEGRA_AON_GPIO_PORT( V, 0x0800, 8, 0),
--
2.13.3
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