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Date: Tue, 31 Jan 2017 11:43:58 -0800
From: Hoan Tran <hotran@....com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
lho@....com, Duc Dang <dhdang@....com>, Hoan Tran <hotran@....com>
Subject: [PATCH] gpio: dwapb: Add support for next generation of X-Gene SoC
Next generation of X-Gene SoC's GPIO hardware register map is very
similar to DW GPIO. It only differs by a few register addresses.
This patch modifies DW GPIO driver to accommodate the difference
in a few register addresses.
Signed-off-by: Hoan Tran <hotran@....com>
---
drivers/gpio/gpio-dwapb.c | 84 +++++++++++++++++++++++++++++++++++++----------
1 file changed, 67 insertions(+), 17 deletions(-)
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 6193f62..5f21751 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/property.h>
@@ -55,6 +56,13 @@
#define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR)
#define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR)
+#define GPIO_REG_OFFSET_V2 1
+#define GPIO_INTMASK_V2 0x44
+#define GPIO_INTTYPE_LEVEL_V2 0x34
+#define GPIO_INT_POLARITY_V2 0x38
+#define GPIO_INTSTATUS_V2 0x3c
+#define GPIO_PORTA_EOI_V2 0x40
+
struct dwapb_gpio;
#ifdef CONFIG_PM_SLEEP
@@ -87,14 +95,36 @@ struct dwapb_gpio {
struct dwapb_gpio_port *ports;
unsigned int nr_ports;
struct irq_domain *domain;
+ unsigned int flags;
};
+static inline u32 gpio_reg_convert(struct dwapb_gpio *gpio, unsigned int offset)
+{
+ if (!(gpio->flags & GPIO_REG_OFFSET_V2))
+ return offset;
+
+ switch (offset) {
+ case GPIO_INTMASK:
+ return GPIO_INTMASK_V2;
+ case GPIO_INTTYPE_LEVEL:
+ return GPIO_INTTYPE_LEVEL_V2;
+ case GPIO_INT_POLARITY:
+ return GPIO_INT_POLARITY_V2;
+ case GPIO_INTSTATUS:
+ return GPIO_INTSTATUS_V2;
+ case GPIO_PORTA_EOI:
+ return GPIO_PORTA_EOI_V2;
+ }
+
+ return offset;
+}
+
static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
{
struct gpio_chip *gc = &gpio->ports[0].gc;
void __iomem *reg_base = gpio->regs;
- return gc->read_reg(reg_base + offset);
+ return gc->read_reg(reg_base + gpio_reg_convert(gpio, offset));
}
static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
@@ -103,7 +133,7 @@ static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
struct gpio_chip *gc = &gpio->ports[0].gc;
void __iomem *reg_base = gpio->regs;
- gc->write_reg(reg_base + offset, val);
+ gc->write_reg(reg_base + gpio_reg_convert(gpio, offset), val);
}
static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
@@ -336,8 +366,8 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
ct->chip.irq_disable = dwapb_irq_disable;
ct->chip.irq_request_resources = dwapb_irq_reqres;
ct->chip.irq_release_resources = dwapb_irq_relres;
- ct->regs.ack = GPIO_PORTA_EOI;
- ct->regs.mask = GPIO_INTMASK;
+ ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI);
+ ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK);
ct->type = IRQ_TYPE_LEVEL_MASK;
}
@@ -520,6 +550,21 @@ static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
return pdata;
}
+static const struct of_device_id dwapb_of_match[] = {
+ { .compatible = "snps,dw-apb-gpio", .data = (void *)0},
+ { .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2},
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, dwapb_of_match);
+
+static const struct acpi_device_id dwapb_acpi_match[] = {
+ {"HISI0181", 0},
+ {"APMC0D07", 0},
+ {"APMC0D81", GPIO_REG_OFFSET_V2},
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
+
static int dwapb_gpio_probe(struct platform_device *pdev)
{
unsigned int i;
@@ -528,6 +573,7 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
int err;
struct device *dev = &pdev->dev;
struct dwapb_platform_data *pdata = dev_get_platdata(dev);
+ const struct of_device_id *of_devid;
if (!pdata) {
pdata = dwapb_gpio_get_pdata(dev);
@@ -555,6 +601,23 @@ static int dwapb_gpio_probe(struct platform_device *pdev)
if (IS_ERR(gpio->regs))
return PTR_ERR(gpio->regs);
+ gpio->flags = 0;
+ of_devid = of_match_device(dwapb_of_match, dev);
+ if (of_devid) {
+ if (of_devid->data)
+ gpio->flags = (uintptr_t)of_devid->data;
+ }
+#ifdef CONFIG_ACPI
+ else {
+ const struct acpi_device_id *acpi_id;
+
+ acpi_id = acpi_match_device(dwapb_acpi_match, &pdev->dev);
+ if (acpi_id) {
+ if (acpi_id->driver_data)
+ gpio->flags = acpi_id->driver_data;
+ }
+ }
+#endif
for (i = 0; i < gpio->nr_ports; i++) {
err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
if (err)
@@ -581,19 +644,6 @@ static int dwapb_gpio_remove(struct platform_device *pdev)
return 0;
}
-static const struct of_device_id dwapb_of_match[] = {
- { .compatible = "snps,dw-apb-gpio" },
- { /* Sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, dwapb_of_match);
-
-static const struct acpi_device_id dwapb_acpi_match[] = {
- {"HISI0181", 0},
- {"APMC0D07", 0},
- { }
-};
-MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
-
#ifdef CONFIG_PM_SLEEP
static int dwapb_gpio_suspend(struct device *dev)
{
--
1.9.1
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