From: Bin Meng <bmeng.cn@gmail.com>
Date: Mon, 1 Feb 2016 09:40:43 +0000 (-0800)
Subject: dm: pch: Add get_gpio_base op
X-Git-Tag: v2016.03-rc2~120
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=384980c687ca38c028bdf40f59a38b3f52105884;p=oweals%2Fu-boot.git

dm: pch: Add get_gpio_base op

x86 GPIO registers are accessed via I/O port whose base address is
configured in a PCI configuration register on the PCH device. Add
an op get_gpio_base to get the GPIO base address from PCH.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
---

diff --git a/drivers/pch/pch-uclass.c b/drivers/pch/pch-uclass.c
index b33d50201b..48a3965a76 100644
--- a/drivers/pch/pch-uclass.c
+++ b/drivers/pch/pch-uclass.c
@@ -33,6 +33,17 @@ int pch_set_spi_protect(struct udevice *dev, bool protect)
 	return ops->set_spi_protect(dev, protect);
 }
 
+int pch_get_gpio_base(struct udevice *dev, u32 *gbasep)
+{
+	struct pch_ops *ops = pch_get_ops(dev);
+
+	*gbasep = 0;
+	if (!ops->get_gpio_base)
+		return -ENOSYS;
+
+	return ops->get_gpio_base(dev, gbasep);
+}
+
 static int pch_uclass_post_bind(struct udevice *bus)
 {
 	/*
diff --git a/include/pch.h b/include/pch.h
index c04cfa32bc..b378865c67 100644
--- a/include/pch.h
+++ b/include/pch.h
@@ -32,6 +32,15 @@ struct pch_ops {
 	 * @return 0 on success, -ENOSYS if not implemented
 	 */
 	int (*set_spi_protect)(struct udevice *dev, bool protect);
+
+	/**
+	 * get_gpio_base() - get the address of GPIO base
+	 *
+	 * @dev:	PCH device to check
+	 * @gbasep:	Returns address of GPIO base if available, else 0
+	 * @return 0 if OK, -ve on error (e.g. there is no GPIO base)
+	 */
+	int (*get_gpio_base)(struct udevice *dev, u32 *gbasep);
 };
 
 #define pch_get_ops(dev)        ((struct pch_ops *)(dev)->driver->ops)
@@ -55,4 +64,13 @@ int pch_get_spi_base(struct udevice *dev, ulong *sbasep);
  */
 int pch_set_spi_protect(struct udevice *dev, bool protect);
 
+/**
+ * pch_get_gpio_base() - get the address of GPIO base
+ *
+ * @dev:	PCH device to check
+ * @gbasep:	Returns address of GPIO base if available, else 0
+ * @return 0 if OK, -ve on error (e.g. there is no GPIO base)
+ */
+int pch_get_gpio_base(struct udevice *dev, u32 *gbasep);
+
 #endif