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PCI: rockchip: Add per-lane PHY support 

We distinguish the legacy PHY from newer per-lane PHYs by adding legacy_phy
flag.  Note that the legacy PHY is still the first option to be searched in
order not to break the backward compatibility of DTB.

Tested-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[bhelgaas: tidy rockchip_pcie_get_phys()]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Shawn Lin 2017-08-25 15:59:01 -05:00 committed by Bjorn Helgaas
parent 2ba5991f34
commit 9e87240c46
1 changed files with 58 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
drivers/pci/host/pcie-rockchip.c
View File

@ -47,6 +47,7 @@
#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val)
#define ENCODE_LANES(x) ((((x) >> 1) & 3) << 4)
#define MAX_LANE_NUM 4
#define PCIE_CLIENT_BASE 0x0
#define PCIE_CLIENT_CONFIG (PCIE_CLIENT_BASE + 0x00)
@ -210,7 +211,8 @@
struct rockchip_pcie {
void __iomem *reg_base; /* DT axi-base */
void __iomem *apb_base; /* DT apb-base */
struct phy *phy;
bool legacy_phy;
struct phy *phys[MAX_LANE_NUM];
struct reset_control *core_rst;
struct reset_control *mgmt_rst;
struct reset_control *mgmt_sticky_rst;
@ -515,7 +517,7 @@ static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
{
struct device *dev = rockchip->dev;
int err;
int err, i;
u32 status;
gpiod_set_value(rockchip->ep_gpio, 0);
@ -538,10 +540,12 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
return err;
}
err = phy_init(rockchip->phy);
if (err < 0) {
dev_err(dev, "fail to init phy, err %d\n", err);
return err;
for (i = 0; i < MAX_LANE_NUM; i++) {
err = phy_init(rockchip->phys[i]);
if (err) {
dev_err(dev, "init phy%d err %d\n", i, err);
return err;
}
}
err = reset_control_assert(rockchip->core_rst);
@ -603,10 +607,12 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
PCIE_CLIENT_MODE_RC,
PCIE_CLIENT_CONFIG);
err = phy_power_on(rockchip->phy);
if (err) {
dev_err(dev, "fail to power on phy, err %d\n", err);
return err;
for (i = 0; i < MAX_LANE_NUM; i++) {
err = phy_power_on(rockchip->phys[i]);
if (err) {
dev_err(dev, "power on phy%d err %d\n", i, err);
return err;
}
}
/*
@ -857,12 +863,39 @@ static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
static int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
{
struct device *dev = rockchip->dev;
struct phy *phy;
char *name;
u32 i;
rockchip->phy = devm_phy_get(dev, "pcie-phy");
if (IS_ERR(rockchip->phy)) {
if (PTR_ERR(rockchip->phy) != -EPROBE_DEFER)
dev_err(dev, "missing phy\n");
return PTR_ERR(rockchip->phy);
phy = devm_phy_get(dev, "pcie-phy");
if (!IS_ERR(phy)) {
rockchip->legacy_phy = true;
rockchip->phys[0] = phy;
dev_warn(dev, "legacy phy model is deprecated!\n");
return 0;
}
if (PTR_ERR(phy) == -EPROBE_DEFER)
return PTR_ERR(phy);
dev_dbg(dev, "missing legacy phy; search for per-lane PHY\n");
for (i = 0; i < MAX_LANE_NUM; i++) {
name = kasprintf(GFP_KERNEL, "pcie-phy-%u", i);
if (!name)
return -ENOMEM;
phy = devm_of_phy_get(dev, dev->of_node, name);
kfree(name);
if (IS_ERR(phy)) {
if (PTR_ERR(phy) != -EPROBE_DEFER)
dev_err(dev, "missing phy for lane %d: %ld\n",
i, PTR_ERR(phy));
return PTR_ERR(phy);
}
rockchip->phys[i] = phy;
}
return 0;
@ -1302,7 +1335,7 @@ static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
{
struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
int ret;
int ret, i;
/* disable core and cli int since we don't need to ack PME_ACK */
rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
@ -1315,8 +1348,10 @@ static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
return ret;
}
phy_power_off(rockchip->phy);
phy_exit(rockchip->phy);
for (i = 0; i < MAX_LANE_NUM; i++) {
phy_power_off(rockchip->phys[i]);
phy_exit(rockchip->phys[i]);
}
clk_disable_unprepare(rockchip->clk_pcie_pm);
clk_disable_unprepare(rockchip->hclk_pcie);
@ -1554,14 +1589,17 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
int i;
pci_stop_root_bus(rockchip->root_bus);
pci_remove_root_bus(rockchip->root_bus);
pci_unmap_iospace(rockchip->io);
irq_domain_remove(rockchip->irq_domain);
phy_power_off(rockchip->phy);
phy_exit(rockchip->phy);
for (i = 0; i < MAX_LANE_NUM; i++) {
phy_power_off(rockchip->phys[i]);
phy_exit(rockchip->phys[i]);
}
clk_disable_unprepare(rockchip->clk_pcie_pm);
clk_disable_unprepare(rockchip->hclk_pcie);