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PCI: keystone: Use SYSCON APIs to get device ID from control module

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Control module registers should be read using syscon APIs.
pci-keystone.c uses platform_get_resource() to get control module registers.
Fix it here by using syscon APIs to get device id from control module.

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 2018-10-17 13:11:03 +05:30 committed by Lorenzo Pieralisi
parent 03d1783864
commit b51a625b78
1 changed files with 32 additions and 13 deletions
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45
drivers/pci/controller/dwc/pci-keystone.c
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@ -15,12 +15,14 @@
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/init.h>
#include <linux/mfd/syscon.h>
#include <linux/msi.h>
#include <linux/of_irq.h>
#include <linux/of.h>
#include <linux/of_pci.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include <linux/resource.h>
#include <linux/signal.h>
@ -28,6 +30,9 @@
#define DRIVER_NAME "keystone-pcie"
#define PCIE_VENDORID_MASK 0xffff
#define PCIE_DEVICEID_SHIFT 16
/* DEV_STAT_CTRL */
#define PCIE_CAP_BASE 0x70
@ -744,10 +749,34 @@ static int ks_pcie_fault(unsigned long addr, unsigned int fsr,
return 0;
}
static int __init ks_pcie_init_id(struct keystone_pcie *ks_pcie)
{
int ret;
unsigned int id;
struct regmap *devctrl_regs;
struct dw_pcie *pci = ks_pcie->pci;
struct device *dev = pci->dev;
struct device_node *np = dev->of_node;
devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-id");
if (IS_ERR(devctrl_regs))
return PTR_ERR(devctrl_regs);
ret = regmap_read(devctrl_regs, 0, &id);
if (ret)
return ret;
dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, id & PCIE_VENDORID_MASK);
dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, id >> PCIE_DEVICEID_SHIFT);
return 0;
}
static int __init ks_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
int ret;
dw_pcie_setup_rc(pp);
@ -757,8 +786,9 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
pci->dbi_base + PCI_IO_BASE);
/* update the Vendor ID */
writew(ks_pcie->device_id, pci->dbi_base + PCI_DEVICE_ID);
ret = ks_pcie_init_id(ks_pcie);
if (ret < 0)
return ret;
/*
* PCIe access errors that result into OCP errors are caught by ARM as
@ -864,8 +894,6 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct keystone_pcie *ks_pcie;
struct resource *res;
void __iomem *reg_p;
struct phy *phy;
int ret;
@ -893,15 +921,6 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
return ret;
}
/* index 2 is to read PCI DEVICE_ID */
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
reg_p = devm_ioremap_resource(dev, res);
if (IS_ERR(reg_p))
return PTR_ERR(reg_p);
ks_pcie->device_id = readl(reg_p) >> 16;
devm_iounmap(dev, reg_p);
devm_release_mem_region(dev, res->start, resource_size(res));
ks_pcie->np = dev->of_node;
platform_set_drvdata(pdev, ks_pcie);
ks_pcie->clk = devm_clk_get(dev, "pcie");