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Subject[PATCH 3/3] HACK: pci: dra7xx: use pdata callbacks to perform reset
Date
Use platform populated reset assert and deassert
callbacks to perform reset of PCIe.

Use these callbacks until a reset interface using drivers/reset
is available for the purpose.

Reviewed-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
drivers/pci/host/pci-dra7xx.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index 8c36880..049083d 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -25,6 +25,8 @@
#include <linux/resource.h>
#include <linux/types.h>

+#include <linux/platform_data/pci-dra7xx.h>
+
#include "pcie-designware.h"

/* PCIe controller wrapper DRA7XX configuration registers */
@@ -329,6 +331,32 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
return 0;
}

+static int dra7xx_pcie_reset(struct platform_device *pdev)
+{
+ int ret;
+ struct device *dev = &pdev->dev;
+ struct pci_dra7xx_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!(pdata && pdata->deassert_reset && pdata->assert_reset)) {
+ dev_err(dev, "platform data for reset not found!\n");
+ return -EINVAL;
+ }
+
+ ret = pdata->assert_reset(pdev, pdata->reset_name);
+ if (ret) {
+ dev_err(dev, "assert_reset failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = pdata->deassert_reset(pdev, pdata->reset_name);
+ if (ret) {
+ dev_err(dev, "deassert_reset failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
static int __init dra7xx_pcie_probe(struct platform_device *pdev)
{
u32 reg;
@@ -347,6 +375,10 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
enum of_gpio_flags flags;
unsigned long gpio_flags;

+ ret = dra7xx_pcie_reset(pdev);
+ if (ret)
+ return ret;
+
dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
if (!dra7xx)
return -ENOMEM;
--
1.7.9.5
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