drivers/genesyslogic/gl9763e: Add driver for Genesys Logic GL9763E

The device is a PCIe to eMMC bridge controller to be used in the
Chromebook as the boot disk. The datasheet name is GL9763E and
the revision is 02.

The patch sets single request AXI, disables ASPM L0s and enables SSC.

Signed-off-by: Ben Chuang <benchuanggli@gmail.com>
Change-Id: I158c79f5ac6e559f335b6b50092469c7b1646c56
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43751
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/drivers/genesyslogic/gl9763e/gl9763e.c b/src/drivers/genesyslogic/gl9763e/gl9763e.c
new file mode 100644
index 0000000000..48e520bde2
--- /dev/null
+++ b/src/drivers/genesyslogic/gl9763e/gl9763e.c
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* Driver for Genesys Logic GL9763E */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <device/pci.h>
+#include <device/pci_ops.h>
+#include <device/pci_ids.h>
+#include "gl9763e.h"
+
+static void gl9763e_init(struct device *dev)
+{
+	printk(BIOS_INFO, "GL9763E: init\n");
+	pci_dev_init(dev);
+
+	/* Set VHS (Vendor Header Space) to be writable */
+	pci_update_config32(dev, VHS, ~VHS_REV_MASK, VHS_REV_W);
+	/* Set single AXI request */
+	pci_or_config32(dev, SCR, SCR_AXI_REQ);
+	/* Disable L0s support */
+	pci_and_config32(dev, CFG_REG_2, ~CFG_REG_2_L0S);
+	/* Set SSC to 30000 ppm */
+	pci_update_config32(dev, PLL_CTL_2, ~PLL_CTL_2_MAX_SSC_MASK, MAX_SSC_30000PPM);
+	/* Enable SSC */
+	pci_or_config32(dev, PLL_CTL, PLL_CTL_SSC);
+	/* Set VHS to read-only */
+	pci_update_config32(dev, VHS, ~VHS_REV_MASK, VHS_REV_R);
+}
+
+static struct device_operations gl9763e_ops = {
+	.read_resources		= pci_dev_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.ops_pci		= &pci_dev_ops_pci,
+	.init			= gl9763e_init,
+};
+
+static const unsigned short pci_device_ids[] = {
+	PCI_DEVICE_ID_GLI_9763E,
+	0
+};
+
+static const struct pci_driver genesyslogic_gl9763e __pci_driver = {
+	.ops		= &gl9763e_ops,
+	.vendor		= PCI_VENDOR_ID_GLI,
+	.devices	= pci_device_ids,
+};
+
+struct chip_operations drivers_generic_genesyslogic_ops = {
+	CHIP_NAME("Genesys Logic GL9763E")
+};