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path: root/drivers/pch/pch7.c
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Diffstat (limited to 'drivers/pch/pch7.c')
-rw-r--r--drivers/pch/pch7.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/pch/pch7.c b/drivers/pch/pch7.c
index fe1fb85131..302c9299ee 100644
--- a/drivers/pch/pch7.c
+++ b/drivers/pch/pch7.c
@@ -8,6 +8,7 @@
#include <dm.h>
#include <pch.h>
+#define GPIO_BASE 0x44
#define BIOS_CTRL 0xd8
static int pch7_get_spi_base(struct udevice *dev, ulong *sbasep)
@@ -37,9 +38,41 @@ static int pch7_set_spi_protect(struct udevice *dev, bool protect)
return 0;
}
+static int pch7_get_gpio_base(struct udevice *dev, u32 *gbasep)
+{
+ u32 base;
+
+ /*
+ * GPIO_BASE moved to its current offset with ICH6, but prior to
+ * that it was unused (or undocumented). Check that it looks
+ * okay: not all ones or zeros.
+ *
+ * Note we don't need check bit0 here, because the Tunnel Creek
+ * GPIO base address register bit0 is reserved (read returns 0),
+ * while on the Ivybridge the bit0 is used to indicate it is an
+ * I/O space.
+ */
+ dm_pci_read_config32(dev, GPIO_BASE, &base);
+ if (base == 0x00000000 || base == 0xffffffff) {
+ debug("%s: unexpected BASE value\n", __func__);
+ return -ENODEV;
+ }
+
+ /*
+ * Okay, I guess we're looking at the right device. The actual
+ * GPIO registers are in the PCI device's I/O space, starting
+ * at the offset that we just read. Bit 0 indicates that it's
+ * an I/O address, not a memory address, so mask that off.
+ */
+ *gbasep = base & 1 ? base & ~3 : base & ~15;
+
+ return 0;
+}
+
static const struct pch_ops pch7_ops = {
.get_spi_base = pch7_get_spi_base,
.set_spi_protect = pch7_set_spi_protect,
+ .get_gpio_base = pch7_get_gpio_base,
};
static const struct udevice_id pch7_ids[] = {
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