At some point we may need to distinguish between different types of PCHs,
but for existing supported platforms we only need to worry about version 7
and version 9 bridges. Add a driver for the PCH7.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v3: None
Changes in v2:
- Rename the PCH functions
- Update the get_version() handle to use an enum
- Add a function to obtain the SPI base address
- Add enums for BIOS_CTRL register and bits
drivers/pch/Makefile | 1 +
drivers/pch/pch7.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++
include/pch.h | 9 ++++++++
3 files changed, 69 insertions(+)
create mode 100644 drivers/pch/pch7.c
diff --git a/drivers/pch/Makefile b/drivers/pch/Makefile
index d69a99c..33aa727 100644
--- a/drivers/pch/Makefile
+++ b/drivers/pch/Makefile
@@ -3,3 +3,4 @@
#
obj-y += pch-uclass.o
+obj-y += pch7.o
diff --git a/drivers/pch/pch7.c b/drivers/pch/pch7.c
new file mode 100644
index 0000000..847f1cd
--- /dev/null
+++ b/drivers/pch/pch7.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pch.h>
+
+static int pch7_get_sbase(struct udevice *dev, ulong *sbasep)
+{
+ u32 rcba;
+
+ dm_pci_read_config32(dev, PCH_RCBA, &rcba);
+ /* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable */
+ rcba = rcba & 0xffffc000;
+ *sbasep = rcba + 0x3020;
+
+ return 0;
+}
+
+static enum pch_version pch7_get_version(struct udevice *dev)
+{
+ return PCHV_7;
+}
+
+static int pch7_set_spi_protect(struct udevice *dev, bool protect)
+{
+ uint8_t bios_cntl;
+
+ /* Adjust the BIOS write protect to dis/allow write commands */
+ dm_pci_read_config8(dev, BIOS_CTRL, &bios_cntl);
+ if (protect)
+ bios_cntl &= ~BIOS_CTRL_BIOSWE;
+ else
+ bios_cntl |= BIOS_CTRL_BIOSWE;
+ dm_pci_write_config8(dev, BIOS_CTRL, bios_cntl);
+
+ return 0;
+}
+
+static const struct pch_ops pch7_ops = {
+ .get_sbase = pch7_get_sbase,
+ .get_version = pch7_get_version,
+ .set_spi_protect = pch7_set_spi_protect,
+};
+
+static const struct udevice_id pch7_ids[] = {
+ { .compatible = "intel,pch7" },
+ { }
+};
+
+U_BOOT_DRIVER(pch7_drv) = {
+ .name = "intel-pch7",
+ .id = UCLASS_PCH,
+ .of_match = pch7_ids,
+ .ops = &pch7_ops,
+};
diff --git a/include/pch.h b/include/pch.h
index 39c9300..7df3601 100644
--- a/include/pch.h
+++ b/include/pch.h
@@ -14,6 +14,15 @@ enum pch_version {
PCHV_9,
};
+enum {
+ BIOS_CTRL = 0xdc,
+ PCH_RCBA = 0xf0,
+};
+
+enum {
+ BIOS_CTRL_BIOSWE = BIT(0),
+};
+
/* Operations for the Platform Controller Hub */
struct pch_ops {
/**
--
2.6.0.rc2.230.g3dd15c0
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