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/* SPDX-License-Identifier: GPL-2.0-only */
/* Driver for BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge */
#include <console/console.h>
#include <device/device.h>
#include <device/mmio.h>
#include <device/path.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <device/pci_ids.h>
#include <acpi/acpigen.h>
#include <acpi/acpigen_pci.h>
#include "chip.h"
#include "bh720.h"
#define BH720_ACPI_NAME "BHUB"
static u32 bh720_read_pcr(u32 sdbar, u32 addr)
{
write32p(sdbar + BH720_MEM_RW_ADR, BH720_MEM_RW_READ | addr);
return read32p(sdbar + BH720_MEM_RW_DATA);
}
static void bh720_write_pcr(u32 sdbar, u32 addr, u32 data)
{
write32p(sdbar + BH720_MEM_RW_DATA, data);
write32p(sdbar + BH720_MEM_RW_ADR, BH720_MEM_RW_WRITE | addr);
}
static void bh720_rmw_pcr(u32 sdbar, u32 addr, u32 clear, u32 set)
{
u32 data = bh720_read_pcr(sdbar, addr);
data &= ~clear;
data |= set;
bh720_write_pcr(sdbar, addr, data);
}
static void bh720_program_hs200_mode(struct device *dev)
{
u32 sdbar = pci_read_config32(dev, PCI_BASE_ADDRESS_1);
/* Enable Memory Access Function */
write32p(sdbar + BH720_MEM_ACCESS_EN, 0x40000000);
bh720_write_pcr(sdbar, 0xd0, 0x80000000);
/* Set EMMC VCCQ 1.8V PCR 0x308[4] */
bh720_rmw_pcr(sdbar, BH720_PCR_EMMC_SETTING, 0, BH720_PCR_EMMC_SETTING_1_8V);
/* Set Base clock to 200MHz(PCR 0x304[31:16] = 0x2510) */
bh720_rmw_pcr(sdbar, BH720_PCR_DrvStrength_PLL, 0xffff << 16, 0x2510 << 16);
/* Use PLL Base clock PCR 0x3E4[22] = 1 */
bh720_rmw_pcr(sdbar, BH720_PCR_CSR, 0, BH720_PCR_CSR_EMMC_MODE_SEL);
/* Disable Memory Access */
bh720_write_pcr(sdbar, 0xd0, 0x80000001);
write32p(sdbar + BH720_MEM_ACCESS_EN, 0x80000000);
}
static void bh720_init(struct device *dev)
{
struct drivers_generic_bayhub_config *config = dev->chip_info;
pci_dev_init(dev);
if (config && config->power_saving) {
/*
* This procedure for enabling power-saving mode is from the
* BayHub BIOS Implementation Guideline document.
*/
pci_write_config32(dev, BH720_PROTECT,
BH720_PROTECT_OFF | BH720_PROTECT_LOCK_OFF);
pci_or_config32(dev, BH720_RTD3_L1, BH720_RTD3_L1_DISABLE_L1);
pci_or_config32(dev, BH720_LINK_CTRL,
BH720_LINK_CTRL_L0_ENABLE |
BH720_LINK_CTRL_L1_ENABLE);
pci_or_config32(dev, BH720_LINK_CTRL, BH720_LINK_CTRL_CLKREQ);
pci_update_config32(dev, BH720_MISC2, ~BH720_MISC2_ASPM_DISABLE,
BH720_MISC2_APSM_CLKREQ_L1 |
BH720_MISC2_APSM_PHY_L1);
pci_write_config32(dev, BH720_PROTECT,
BH720_PROTECT_ON | BH720_PROTECT_LOCK_ON);
printk(BIOS_INFO, "BayHub BH720: Power-saving enabled (link_ctrl=%#x)\n",
pci_read_config32(dev, BH720_LINK_CTRL));
}
if (config && !config->disable_hs200_mode)
bh720_program_hs200_mode(dev);
if (config && config->vih_tuning_value) {
/* Tune VIH */
u32 bh720_pcr_data;
pci_write_config32(dev, BH720_PROTECT,
BH720_PROTECT_OFF | BH720_PROTECT_LOCK_OFF);
bh720_pcr_data = pci_read_config32(dev, BH720_PCR_DrvStrength_PLL);
bh720_pcr_data &= 0xFFFFFF00;
bh720_pcr_data |= config->vih_tuning_value;
pci_write_config32(dev, BH720_PCR_DrvStrength_PLL, bh720_pcr_data);
pci_write_config32(dev, BH720_PROTECT,
BH720_PROTECT_ON | BH720_PROTECT_LOCK_ON);
}
}
static void bh720_fill_ssdt(const struct device *dev)
{
if (dev->path.type != DEVICE_PATH_PCI) {
return;
}
const char *scope = acpi_device_scope(dev);
const char *name = acpi_device_name(dev);
if (!scope || !name)
return;
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(name);
acpigen_write_ADR_pci_device(dev);
acpigen_write_STA(acpi_device_status(dev));
/* Card */
acpigen_write_device("CARD");
acpigen_write_ADR(0x08); //eMMC is always on address 0x8
/*
* Method (_RMV, 0, NotSerialized) { Return (0) }
*/
acpigen_write_method("_RMV", 0); /* Method */
acpigen_emit_byte(RETURN_OP);
acpigen_write_byte(0);
acpigen_pop_len(); /* Method */
acpigen_pop_len(); /* Card */
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
}
static const char *bh720_acpi_name(const struct device *dev)
{
return BH720_ACPI_NAME;
}
static struct device_operations bh720_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 = bh720_init,
.acpi_name = bh720_acpi_name,
.acpi_fill_ssdt = bh720_fill_ssdt
};
static const unsigned short pci_device_ids[] = {
PCI_DID_O2_BH720,
0
};
static const struct pci_driver bayhub_bh720 __pci_driver = {
.ops = &bh720_ops,
.vendor = PCI_VID_O2,
.devices = pci_device_ids,
};
struct chip_operations drivers_generic_bayhub_ops = {
.name = "BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge",
};
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