lkml.org 
[lkml]   [2018]   [Oct]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 10/19] PCI: keystone: Use syscon APIs to get device id from control module
Date
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>
---
drivers/pci/controller/dwc/pci-keystone.c | 45 ++++++++++++++++-------
1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index e2045b5d2af2..e22328f89c84 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -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");
--
2.17.1
\
 
 \ /
  Last update: 2018-10-15 15:09    [W:0.176 / U:2.548 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site