[U-Boot] [PATCH 16/18] rockchip: Implement spl_gpio in the GPIO driver

[Simon Glass]

Allow rockchip boards to use GPIOs before driver model is ready. This is
really only useful for setting GPIOs to enable the early debug console, if
needed on some platforms.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/arm/include/asm/arch-rockchip/gpio.h | 29 ++++++++++++++
 drivers/gpio/rk_gpio.c                    | 46 +++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/arch/arm/include/asm/arch-rockchip/gpio.h b/arch/arm/include/asm/arch-rockchip/gpio.h
index e204dcfd1d..3b337c4d41 100644
--- a/arch/arm/include/asm/arch-rockchip/gpio.h
+++ b/arch/arm/include/asm/arch-rockchip/gpio.h
@@ -24,4 +24,33 @@ struct rockchip_gpio_regs {
 };
 check_member(rockchip_gpio_regs, ls_sync, 0x60);
 
+/* These defines are only used by spl_gpio.h */
+enum {
+	/* Banks have 8 GPIOs, so 3 bits, and there are 4 banks, so 2 bits */
+	GPIO_BANK_SHIFT		= 3,
+	GPIO_BANK_MASK		= 3 << GPIO_BANK_SHIFT,
+
+	GPIO_OFFSET_MASK	= 0x1f,
+};
+
+#define GPIO(bank, offset)	((bank) << GPIO_BANK_SHIFT | (offset))
+
+enum gpio_bank_t {
+	BANK_A = 0,
+	BANK_B,
+	BANK_C,
+	BANK_D,
+};
+
+enum gpio_dir_t {
+	GPIO_INPUT = 0,
+	GPIO_OUTPUT,
+};
+
+enum gpio_pull_t {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_UP,
+};
+
 #endif
diff --git a/drivers/gpio/rk_gpio.c b/drivers/gpio/rk_gpio.c
index a8f311bbd6..c4d0c4ff23 100644
--- a/drivers/gpio/rk_gpio.c
+++ b/drivers/gpio/rk_gpio.c
@@ -91,6 +91,52 @@ static int rockchip_gpio_get_function(struct udevice *dev, unsigned offset)
 #endif
 }
 
+/* Simple SPL interface to GPIOs */
+#ifdef CONFIG_SPL_BUILD
+
+enum {
+	PULL_NONE_1V8 = 0,
+	PULL_DOWN_1V8 = 1,
+	PULL_UP_1V8 = 3,
+};
+
+int spl_gpio_set_pull(void *vregs, uint gpio, int pull)
+{
+	u32 *regs = vregs;
+	uint val;
+
+	regs += gpio >> GPIO_BANK_SHIFT;
+	gpio &= GPIO_OFFSET_MASK;
+	switch (pull) {
+	case GPIO_PULL_UP:
+		val = PULL_UP_1V8;
+		break;
+	case GPIO_PULL_DOWN:
+		val = PULL_DOWN_1V8;
+		break;
+	case GPIO_PULL_NONE:
+	default:
+		val = PULL_NONE_1V8;
+		break;
+	}
+	clrsetbits_le32(regs, 3 << (gpio * 2), val << (gpio * 2));
+
+	return 0;
+}
+
+int spl_gpio_output(void *vregs, uint gpio, int value)
+{
+	struct rockchip_gpio_regs * const regs = vregs;
+
+	clrsetbits_le32(&regs->swport_dr, 1 << gpio, value << gpio);
+
+	/* Set direction */
+	clrsetbits_le32(&regs->swport_ddr, 1 << gpio, 1 << gpio);
+
+	return 0;
+}
+#endif /* CONFIG_SPL_BUILD */
+
 static int rockchip_gpio_probe(struct udevice *dev)
 {
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
-- 
2.20.1.97.g81188d93c3-goog