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authorSiva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>2016-03-10 16:27:38 +0530
committerMichal Simek <michal.simek@xilinx.com>2016-04-13 18:29:06 +0200
commit68c7026e8d410295bc281128d8c14edef291461d (patch)
treed032e45c91aca3da29217925228fc12086117741 /drivers/gpio
parent08afaf1b4068772fd30ac50e570d6e490fdb3619 (diff)
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gpio: zynq: Convert Zynq GPIO to driver model
Convert Zynq GPIO driver to driver model Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/zynq_gpio.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/gpio/zynq_gpio.c b/drivers/gpio/zynq_gpio.c
index 83a2c46..92c9f0e 100644
--- a/drivers/gpio/zynq_gpio.c
+++ b/drivers/gpio/zynq_gpio.c
@@ -14,6 +14,17 @@
#include <asm/io.h>
#include <asm/errno.h>
+#ifdef CONFIG_DM_GPIO
+#include <dm.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct zynq_gpio_privdata {
+ phys_addr_t base;
+};
+#endif
+
/**
* zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
* for a given pin in the GPIO device
@@ -68,6 +79,7 @@ static int check_gpio(unsigned gpio)
return 0;
}
+#ifndef CONFIG_DM_GPIO
/**
* gpio_get_value - Get the state of the specified pin of GPIO device
* @gpio: gpio pin number within the device
@@ -218,3 +230,142 @@ int gpio_free(unsigned gpio)
{
return 0;
}
+#else
+static int zynq_gpio_get_value(struct udevice *dev, unsigned gpio)
+{
+ u32 data;
+ unsigned int bank_num, bank_pin_num;
+ struct zynq_gpio_privdata *priv = dev_get_priv(dev);
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
+
+ data = readl(priv->base +
+ ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
+
+ return (data >> bank_pin_num) & 1;
+}
+
+static int zynq_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
+{
+ unsigned int reg_offset, bank_num, bank_pin_num;
+ struct zynq_gpio_privdata *priv = dev_get_priv(dev);
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
+
+ if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
+ /* only 16 data bits in bit maskable reg */
+ bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
+ reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
+ } else {
+ reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
+ }
+
+ /*
+ * get the 32 bit value to be written to the mask/data register where
+ * the upper 16 bits is the mask and lower 16 bits is the data
+ */
+ value = !!value;
+ value = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
+ ((value << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
+
+ writel(value, priv->base + reg_offset);
+
+ return 0;
+}
+
+static int zynq_gpio_direction_input(struct udevice *dev, unsigned gpio)
+{
+ u32 reg;
+ unsigned int bank_num, bank_pin_num;
+ struct zynq_gpio_privdata *priv = dev_get_priv(dev);
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
+
+ /* bank 0 pins 7 and 8 are special and cannot be used as inputs */
+ if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
+ return -1;
+
+ /* clear the bit in direction mode reg to set the pin as input */
+ reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+ reg &= ~BIT(bank_pin_num);
+ writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+
+ return 0;
+}
+
+static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio,
+ int value)
+{
+ u32 reg;
+ unsigned int bank_num, bank_pin_num;
+ struct zynq_gpio_privdata *priv = dev_get_priv(dev);
+
+ if (check_gpio(gpio) < 0)
+ return -1;
+
+ zynq_gpio_get_bank_pin(gpio, &bank_num, &bank_pin_num);
+
+ /* set the GPIO pin as output */
+ reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+ reg |= BIT(bank_pin_num);
+ writel(reg, priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+
+ /* configure the output enable reg for the pin */
+ reg = readl(priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+ reg |= BIT(bank_pin_num);
+ writel(reg, priv->base + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+
+ /* set the state of the pin */
+ gpio_set_value(gpio, value);
+ return 0;
+}
+
+static const struct dm_gpio_ops gpio_zynq_ops = {
+ .direction_input = zynq_gpio_direction_input,
+ .direction_output = zynq_gpio_direction_output,
+ .get_value = zynq_gpio_get_value,
+ .set_value = zynq_gpio_set_value,
+};
+
+static int zynq_gpio_probe(struct udevice *dev)
+{
+ struct zynq_gpio_privdata *priv = dev_get_priv(dev);
+
+ priv->base = dev_get_addr(dev);
+
+ return 0;
+}
+
+static int zynq_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ uc_priv->gpio_count = ZYNQ_GPIO_NR_GPIOS;
+
+ return 0;
+}
+
+static const struct udevice_id zynq_gpio_ids[] = {
+ { .compatible = "xlnx,zynq-gpio-1.0" },
+ { }
+};
+
+U_BOOT_DRIVER(gpio_zynq) = {
+ .name = "gpio_zynq",
+ .id = UCLASS_GPIO,
+ .ops = &gpio_zynq_ops,
+ .of_match = zynq_gpio_ids,
+ .ofdata_to_platdata = zynq_gpio_ofdata_to_platdata,
+ .probe = zynq_gpio_probe,
+ .priv_auto_alloc_size = sizeof(struct zynq_gpio_privdata),
+};
+#endif