drivers/generic/bayhub_lv2: Add driver for BayHub lv2
Add a driver which puts the device into power-saving mode.
BUG=b:177955523
BRANCH=zork
TEST=boot and see this message:
BayHub LV2: Power-saving enabled 110102
Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Change-Id: Idc1340b1a6fe7063d16c8ea16488d6e2b8b308cc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49783
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/drivers/generic/bayhub_lv2/lv2.c b/src/drivers/generic/bayhub_lv2/lv2.c
new file mode 100644
index 0000000..9e9f074
--- /dev/null
+++ b/src/drivers/generic/bayhub_lv2/lv2.c
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* Driver for BayHub Technology LV2 PCI to SD bridge */
+
+#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 "chip.h"
+#include "lv2.h"
+
+static void lv2_init(struct device *dev)
+{
+ struct drivers_generic_bayhub_lv2_config *config = dev->chip_info;
+ pci_dev_init(dev);
+
+ if (!config || !config->enable_power_saving)
+ return;
+ /*
+ * This procedure for enabling power-saving mode is from the
+ * BayHub BIOS Implementation Guideline document.
+ */
+ pci_write_config32(dev, LV2_PROTECT, LV2_PROTECT_OFF | LV2_PROTECT_LOCK_OFF);
+ pci_or_config32(dev, LV2_PCR_HEX_FC, LV2_PCIE_PHY_P1_ENABLE);
+ pci_update_config32(dev, LV2_PCR_HEX_E0, LV2_PCI_PM_L1_TIMER_MASK, LV2_PCI_PM_L1_TIMER);
+ pci_update_config32(dev, LV2_PCR_HEX_FC, LV2_ASPM_L1_TIMER_MASK, LV2_ASPM_L1_TIMER);
+ pci_or_config32(dev, LV2_PCR_HEX_A8, LV2_LTR_ENABLE);
+ pci_write_config32(dev, LV2_PCR_HEX_234, LV2_MAX_LATENCY_SETTING);
+ pci_update_config32(dev, LV2_PCR_HEX_248, LV2_L1_SUBSTATE_SETTING_MASK,
+ LV2_L1_SUBSTATE_SETTING);
+ pci_update_config32(dev, LV2_PCR_HEX_3F4, LV2_L1_SUBSTATE_OPTIMISE_MASK,
+ LV2_L1_SUBSTATE_OPTIMISE);
+ pci_or_config32(dev, LV2_LINK_CTRL, LV2_LINK_CTRL_CLKREQ);
+ pci_update_config32(dev, LV2_PCR_HEX_300, LV2_TUNING_WINDOW_MASK, LV2_TUNING_WINDOW);
+ pci_update_config32(dev, LV2_PCR_HEX_304, LV2_DRIVER_STRENGTH_MASK,
+ LV2_DRIVER_STRENGTH);
+ pci_update_config32(dev, LV2_PCR_HEX_308, LV2_RESET_DMA_DISABLE_MASK,
+ LV2_RESET_DMA_DISABLE);
+ pci_update_config32(dev, LV2_LINK_CTRL, LV2_LINK_CTRL_L1_L0_MASK,
+ LV2_LINK_CTRL_L1_ENABLE);
+ pci_write_config32(dev, LV2_PROTECT, LV2_PROTECT_ON | LV2_PROTECT_LOCK_ON);
+ printk(BIOS_INFO, "BayHub LV2: Power-saving enabled (link_ctrl=%#x)\n",
+ pci_read_config32(dev, LV2_LINK_CTRL));
+}
+
+static struct device_operations lv2_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 = lv2_init,
+};
+
+static const unsigned short pci_device_ids[] = {
+ PCI_DEVICE_ID_O2_LV2,
+ 0
+};
+
+static const struct pci_driver bayhub_lv2 __pci_driver = {
+ .ops = &lv2_ops,
+ .vendor = PCI_VENDOR_ID_O2,
+ .devices = pci_device_ids,
+};
+
+struct chip_operations drivers_generic_bayhub_lv2_ops = {
+ CHIP_NAME("BayHub Technology LV2 PCIe to SD bridge")
+};