dm: x86: Add a driver for Intel PCH7
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 <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/pch/pch7.c b/drivers/pch/pch7.c
new file mode 100644
index 0000000..ef72422
--- /dev/null
+++ b/drivers/pch/pch7.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pch.h>
+
+#define BIOS_CTRL 0xd8
+
+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,
+};