[U-Boot] [PATCH v4 2/5] gpio: atmel_pio4: Rework to support DM & DT
Wenyou Yang
wenyou.yang at atmel.com
Tue Jun 7 09:24:19 CEST 2016
Rework the driver to support driver model and device tree, and
support to regard the pio4 pinctrl device as a child of
atmel_pio4 device.
Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
---
Changes in v4:
- Remove the redundant log print.
Changes in v3:
- Add bind callback to support the pinctl device regarding as
a child of atmel_pio4 device.
- Add clock support.
Changes in v2: None
drivers/gpio/Kconfig | 2 +-
drivers/gpio/atmel_pio4.c | 133 +++++++++++++++++++++++++++++++++++++++-------
2 files changed, 114 insertions(+), 21 deletions(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 93a7e8c..11f056d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -30,7 +30,7 @@ config DWAPB_GPIO
config ATMEL_PIO4
bool "ATMEL PIO4 driver"
- depends on DM
+ depends on DM_GPIO
default n
help
Say yes here to support the Atmel PIO4 driver.
diff --git a/drivers/gpio/atmel_pio4.c b/drivers/gpio/atmel_pio4.c
index 84e8cc5..8232bf2 100644
--- a/drivers/gpio/atmel_pio4.c
+++ b/drivers/gpio/atmel_pio4.c
@@ -7,11 +7,17 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <clk.h>
#include <dm.h>
+#include <fdtdec.h>
+#include <dm/root.h>
#include <asm/arch/hardware.h>
+#include <asm/gpio.h>
#include <mach/gpio.h>
#include <mach/atmel_pio4.h>
+DECLARE_GLOBAL_DATA_PTR;
+
static struct atmel_pio4_port *atmel_pio4_port_base(u32 port)
{
struct atmel_pio4_port *base = NULL;
@@ -165,14 +171,38 @@ int atmel_pio4_get_pio_input(u32 port, u32 pin)
}
#ifdef CONFIG_DM_GPIO
+
+struct atmel_pioctrl_data {
+ u32 nbanks;
+};
+
+struct atmel_pio4_platdata {
+ struct atmel_pio4_port *reg_base;
+};
+
+static struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
+ u32 bank)
+{
+ struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
+ struct atmel_pio4_port *port_base =
+ (struct atmel_pio4_port *)((u32)plat->reg_base +
+ ATMEL_PIO_BANK_OFFSET * bank);
+
+ return port_base;
+}
+
static int atmel_pio4_direction_input(struct udevice *dev, unsigned offset)
{
- struct at91_port_platdata *plat = dev_get_platdata(dev);
- struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
- u32 mask = 0x01 << offset;
- u32 reg = ATMEL_PIO_CFGR_FUNC_GPIO;
+ u32 bank = ATMEL_PIO_BANK(offset);
+ u32 line = ATMEL_PIO_LINE(offset);
+ struct atmel_pio4_port *port_base = atmel_pio4_bank_base(dev, bank);
+ u32 mask = BIT(line);
+ u32 reg;
writel(mask, &port_base->mskr);
+ reg = readl(&port_base->cfgr);
+ reg &= ~ATMEL_PIO_CFGR_FUNC_MASK;
+ reg &= ~ATMEL_PIO_DIR_MASK;
writel(reg, &port_base->cfgr);
return 0;
@@ -181,12 +211,16 @@ static int atmel_pio4_direction_input(struct udevice *dev, unsigned offset)
static int atmel_pio4_direction_output(struct udevice *dev,
unsigned offset, int value)
{
- struct at91_port_platdata *plat = dev_get_platdata(dev);
- struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
- u32 mask = 0x01 << offset;
- u32 reg = ATMEL_PIO_CFGR_FUNC_GPIO | ATMEL_PIO_DIR_MASK;
+ u32 bank = ATMEL_PIO_BANK(offset);
+ u32 line = ATMEL_PIO_LINE(offset);
+ struct atmel_pio4_port *port_base = atmel_pio4_bank_base(dev, bank);
+ u32 mask = BIT(line);
+ u32 reg;
writel(mask, &port_base->mskr);
+ reg = readl(&port_base->cfgr);
+ reg &= ~ATMEL_PIO_CFGR_FUNC_MASK;
+ reg |= ATMEL_PIO_DIR_MASK;
writel(reg, &port_base->cfgr);
if (value)
@@ -199,9 +233,10 @@ static int atmel_pio4_direction_output(struct udevice *dev,
static int atmel_pio4_get_value(struct udevice *dev, unsigned offset)
{
- struct at91_port_platdata *plat = dev_get_platdata(dev);
- struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
- u32 mask = 0x01 << offset;
+ u32 bank = ATMEL_PIO_BANK(offset);
+ u32 line = ATMEL_PIO_LINE(offset);
+ struct atmel_pio4_port *port_base = atmel_pio4_bank_base(dev, bank);
+ u32 mask = BIT(line);
return (readl(&port_base->pdsr) & mask) ? 1 : 0;
}
@@ -209,9 +244,10 @@ static int atmel_pio4_get_value(struct udevice *dev, unsigned offset)
static int atmel_pio4_set_value(struct udevice *dev,
unsigned offset, int value)
{
- struct at91_port_platdata *plat = dev_get_platdata(dev);
- struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
- u32 mask = 0x01 << offset;
+ u32 bank = ATMEL_PIO_BANK(offset);
+ u32 line = ATMEL_PIO_LINE(offset);
+ struct atmel_pio4_port *port_base = atmel_pio4_bank_base(dev, bank);
+ u32 mask = BIT(line);
if (value)
writel(mask, &port_base->sodr);
@@ -223,9 +259,10 @@ static int atmel_pio4_set_value(struct udevice *dev,
static int atmel_pio4_get_function(struct udevice *dev, unsigned offset)
{
- struct at91_port_platdata *plat = dev_get_platdata(dev);
- struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
- u32 mask = 0x01 << offset;
+ u32 bank = ATMEL_PIO_BANK(offset);
+ u32 line = ATMEL_PIO_LINE(offset);
+ struct atmel_pio4_port *port_base = atmel_pio4_bank_base(dev, bank);
+ u32 mask = BIT(line);
writel(mask, &port_base->mskr);
@@ -241,21 +278,77 @@ static const struct dm_gpio_ops atmel_pio4_ops = {
.get_function = atmel_pio4_get_function,
};
+static int atmel_pio4_bind(struct udevice *dev)
+{
+ return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
static int atmel_pio4_probe(struct udevice *dev)
{
- struct at91_port_platdata *plat = dev_get_platdata(dev);
+ struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct atmel_pioctrl_data *pioctrl_data;
+ struct udevice *clkdev;
+ fdt_addr_t addr_base;
+ u32 nbanks;
+ int periph;
+ int ret;
+
+ ret = clk_get_by_index(dev, 0, &clkdev);
+ if (ret)
+ return -EINVAL;
+
+ periph = fdtdec_get_uint(gd->fdt_blob, clkdev->of_offset, "reg", -1);
+ if (periph < 0)
+ return -EINVAL;
+
+ clkdev = dev_get_parent(clkdev);
+ if (!clkdev)
+ return -ENODEV;
+
+ ret = clk_enable(clkdev, periph);
+ if (ret)
+ return ret;
+
+ addr_base = dev_get_addr(dev);
+ if (addr_base == FDT_ADDR_T_NONE)
+ return -ENODEV;
- uc_priv->bank_name = plat->bank_name;
- uc_priv->gpio_count = ATMEL_PIO_NPINS_PER_BANK;
+ plat->reg_base = (struct atmel_pio4_port *)addr_base;
+
+ pioctrl_data = (struct atmel_pioctrl_data *)dev_get_driver_data(dev);
+ nbanks = pioctrl_data->nbanks;
+
+ uc_priv->bank_name = fdt_get_name(gd->fdt_blob, dev->of_offset, NULL);
+ uc_priv->gpio_count = nbanks * ATMEL_PIO_NPINS_PER_BANK;
return 0;
}
+/*
+ * The number of banks can be different from a SoC to another one.
+ * We can have up to 16 banks.
+ */
+static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
+ .nbanks = 4,
+};
+
+static const struct udevice_id atmel_pio4_ids[] = {
+ {
+ .compatible = "atmel,sama5d2-gpio",
+ .data = (ulong)&atmel_sama5d2_pioctrl_data,
+ },
+ {}
+};
+
U_BOOT_DRIVER(gpio_atmel_pio4) = {
.name = "gpio_atmel_pio4",
.id = UCLASS_GPIO,
.ops = &atmel_pio4_ops,
.probe = atmel_pio4_probe,
+ .bind = atmel_pio4_bind,
+ .of_match = atmel_pio4_ids,
+ .platdata_auto_alloc_size = sizeof(struct atmel_pio4_platdata),
};
+
#endif
--
2.7.4
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