hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

PCI: keystone: Explicitly set the PCIe mode 

Explicitly set the PCIe mode to BOOTCFG_DEVCFG instead of always
relying on the default values. This is required when EP mode has to
be explicitly written to BOOTCFG_DEVCFG register.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Kishon Vijay Abraham I 2019-03-25 15:09:29 +05:30 committed by Lorenzo Pieralisi
parent 1c55c4263f
commit 156c6fef75
1 changed files with 37 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/pci/controller/dwc/pci-keystone.c
View File

@ -79,6 +79,15 @@
#define PCIE_RC_K2L 0xb00a
#define PCIE_RC_K2G 0xb00b
#define KS_PCIE_DEV_TYPE_MASK (0x3 << 1)
#define KS_PCIE_DEV_TYPE(mode) ((mode) << 1)
#define EP 0x0
#define LEG_EP 0x1
#define RC 0x2
#define KS_PCIE_SYSCLOCKOUTEN BIT(0)
#define to_keystone_pcie(x) dev_get_drvdata((x)->dev)
struct keystone_pcie {
@ -876,6 +885,30 @@ err_phy:
return ret;
}
static int ks_pcie_set_mode(struct device *dev)
{
struct device_node *np = dev->of_node;
struct regmap *syscon;
u32 val;
u32 mask;
int ret = 0;
syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
if (IS_ERR(syscon))
return 0;
mask = KS_PCIE_DEV_TYPE_MASK | KS_PCIE_SYSCLOCKOUTEN;
val = KS_PCIE_DEV_TYPE(RC) | KS_PCIE_SYSCLOCKOUTEN;
ret = regmap_update_bits(syscon, 0, mask, val);
if (ret) {
dev_err(dev, "failed to set pcie mode\n");
return ret;
}
return 0;
}
static int __init ks_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -988,6 +1021,10 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
goto err_get_sync;
}
ret = ks_pcie_set_mode(dev);
if (ret < 0)
goto err_get_sync;
ret = ks_pcie_add_pcie_port(ks_pcie, pdev);
if (ret < 0)
goto err_get_sync;