提交 dfb80534 编写于 作者: A Alan Douglas 提交者: Lorenzo Pieralisi

PCI: cadence: Add generic PHY support to host and EP drivers

If PHYs are present, initialize and enable them at driver probe.
Signed-off-by: NAlan Douglas <adouglas@cadence.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
上级 7e37dc1d
......@@ -439,6 +439,7 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
struct pci_epc *epc;
struct resource *res;
int ret;
int phy_count;
ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
if (!ep)
......@@ -473,6 +474,12 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
if (!ep->ob_addr)
return -ENOMEM;
ret = cdns_pcie_init_phy(dev, pcie);
if (ret) {
dev_err(dev, "failed to init phy\n");
return ret;
}
platform_set_drvdata(pdev, pcie);
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
......@@ -521,6 +528,10 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
err_get_sync:
pm_runtime_disable(dev);
cdns_pcie_disable_phy(pcie);
phy_count = pcie->phy_count;
while (phy_count--)
device_link_del(pcie->link[phy_count]);
return ret;
}
......@@ -528,6 +539,7 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
static void cdns_pcie_ep_shutdown(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cdns_pcie *pcie = dev_get_drvdata(dev);
int ret;
ret = pm_runtime_put_sync(dev);
......@@ -536,7 +548,7 @@ static void cdns_pcie_ep_shutdown(struct platform_device *pdev)
pm_runtime_disable(dev);
/* The PCIe controller can't be disabled. */
cdns_pcie_disable_phy(pcie);
}
static struct platform_driver cdns_pcie_ep_driver = {
......
......@@ -58,6 +58,9 @@ static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
return pcie->reg_base + (where & 0xfff);
}
/* Check that the link is up */
if (!(cdns_pcie_readl(pcie, CDNS_PCIE_LM_BASE) & 0x1))
return NULL;
/* Update Output registers for AXI region 0. */
addr0 = CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(12) |
......@@ -239,6 +242,7 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
struct cdns_pcie *pcie;
struct resource *res;
int ret;
int phy_count;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
if (!bridge)
......@@ -290,6 +294,13 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
}
pcie->mem_res = res;
ret = cdns_pcie_init_phy(dev, pcie);
if (ret) {
dev_err(dev, "failed to init phy\n");
return ret;
}
platform_set_drvdata(pdev, pcie);
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
......@@ -322,6 +333,10 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
err_get_sync:
pm_runtime_disable(dev);
cdns_pcie_disable_phy(pcie);
phy_count = pcie->phy_count;
while (phy_count--)
device_link_del(pcie->link[phy_count]);
return ret;
}
......
......@@ -124,3 +124,96 @@ void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r)
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), 0);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), 0);
}
void cdns_pcie_disable_phy(struct cdns_pcie *pcie)
{
int i = pcie->phy_count;
while (i--) {
phy_power_off(pcie->phy[i]);
phy_exit(pcie->phy[i]);
}
}
int cdns_pcie_enable_phy(struct cdns_pcie *pcie)
{
int ret;
int i;
for (i = 0; i < pcie->phy_count; i++) {
ret = phy_init(pcie->phy[i]);
if (ret < 0)
goto err_phy;
ret = phy_power_on(pcie->phy[i]);
if (ret < 0) {
phy_exit(pcie->phy[i]);
goto err_phy;
}
}
return 0;
err_phy:
while (--i >= 0) {
phy_power_off(pcie->phy[i]);
phy_exit(pcie->phy[i]);
}
return ret;
}
int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
{
struct device_node *np = dev->of_node;
int phy_count;
struct phy **phy;
struct device_link **link;
int i;
int ret;
const char *name;
phy_count = of_property_count_strings(np, "phy-names");
if (phy_count < 1) {
dev_err(dev, "no phy-names. PHY will not be initialized\n");
pcie->phy_count = 0;
return 0;
}
phy = devm_kzalloc(dev, sizeof(*phy) * phy_count, GFP_KERNEL);
if (!phy)
return -ENOMEM;
link = devm_kzalloc(dev, sizeof(*link) * phy_count, GFP_KERNEL);
if (!link)
return -ENOMEM;
for (i = 0; i < phy_count; i++) {
of_property_read_string_index(np, "phy-names", i, &name);
phy[i] = devm_phy_optional_get(dev, name);
if (IS_ERR(phy))
return PTR_ERR(phy);
link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
if (!link[i]) {
ret = -EINVAL;
goto err_link;
}
}
pcie->phy_count = phy_count;
pcie->phy = phy;
pcie->link = link;
ret = cdns_pcie_enable_phy(pcie);
if (ret)
goto err_link;
return 0;
err_link:
while (--i >= 0)
device_link_del(link[i]);
return ret;
}
......@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
/*
* Local Management Registers
......@@ -229,6 +230,9 @@ struct cdns_pcie {
struct resource *mem_res;
bool is_rc;
u8 bus;
int phy_count;
struct phy **phy;
struct device_link **link;
};
/* Register access */
......@@ -307,5 +311,8 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u8 fn,
u32 r, u64 cpu_addr);
void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r);
void cdns_pcie_disable_phy(struct cdns_pcie *pcie);
int cdns_pcie_enable_phy(struct cdns_pcie *pcie);
int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie);
#endif /* _PCIE_CADENCE_H */
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