Exynos5 SoCs needs to calibrate USB3.0 DRD PHY after every XHCI HCD
reset. This patch adds support for instantiating Exynos5-specific variant
of XHCI-plat driver, which handles the required USB3.0 DRD PHY
calibration.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/usb/dwc3/Kconfig | 1 +
drivers/usb/dwc3/core.c | 1 +
drivers/usb/dwc3/core.h | 1 +
drivers/usb/dwc3/dwc3-exynos.c | 64 +++++++++++++++++++++++-----------
drivers/usb/dwc3/host.c | 2 +-
5 files changed, 47 insertions(+), 22 deletions(-)
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 89abc6078703..badf86dfb027 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -67,6 +67,7 @@ config USB_DWC3_OMAP
config USB_DWC3_EXYNOS
tristate "Samsung Exynos Platform"
depends on (ARCH_EXYNOS || COMPILE_TEST) && OF
+ select USB_XHCI_EXYNOS if USB_XHCI_PLATFORM
default USB_DWC3
help
Recent Exynos5 SoCs ship with one DesignWare Core USB3 IP inside,
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c9bb93a2c81e..baa029ceede9 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1303,6 +1303,7 @@ static void dwc3_get_properties(struct dwc3 *dwc)
&dwc->hsphy_interface);
device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
&dwc->fladj);
+ device_property_read_string(dev, "snps,xhci_variant", &dwc->hcd_name);
dwc->dis_metastability_quirk = device_property_read_bool(dev,
"snps,dis_metastability_quirk");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 3dd783b889cb..1b8f5f5814a4 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1176,6 +1176,7 @@ struct dwc3 {
u8 tx_max_burst_prd;
const char *hsphy_interface;
+ const char *hcd_name;
unsigned connected:1;
unsigned delayed_status:1;
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index c1e9ea621f41..4e847073e85e 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -13,6 +13,7 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/consumer.h>
@@ -35,22 +36,20 @@ struct dwc3_exynos {
struct regulator *vdd33;
struct regulator *vdd10;
+ struct platform_device *dwc3;
};
-static int dwc3_exynos_remove_child(struct device *dev, void *unused)
-{
- struct platform_device *pdev = to_platform_device(dev);
-
- platform_device_unregister(pdev);
-
- return 0;
-}
+static const struct property_entry dwc3_exynos_properties[] = {
+ PROPERTY_ENTRY_STRING("snps,xhci_variant", "exynos5-dwc3-xhci"),
+ {}
+};
static int dwc3_exynos_probe(struct platform_device *pdev)
{
struct dwc3_exynos *exynos;
struct device *dev = &pdev->dev;
- struct device_node *node = dev->of_node;
+ struct device_node *node = dev->of_node, *child;
+ struct platform_device *dwc3;
const struct dwc3_exynos_driverdata *driver_data;
int i, ret;
@@ -109,21 +108,43 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
goto vdd10_err;
}
- if (node) {
- ret = of_platform_populate(node, NULL, NULL, dev);
- if (ret) {
- dev_err(dev, "failed to add dwc3 core\n");
- goto populate_err;
- }
- } else {
- dev_err(dev, "no device node, failed to add dwc3 core\n");
- ret = -ENODEV;
- goto populate_err;
+ child = of_get_next_child(node, NULL);
+ if (!child) {
+ dev_err(dev, "Failed to find DWC3 core device node\n");
+ goto dwc3_child_err;
+ }
+
+ dwc3 = of_device_alloc(child, NULL, dev);
+ if (!dwc3) {
+ dev_err(dev, "Failed to allocate DWC3 core device\n");
+ goto dwc3_alloc_err;
+ }
+
+ dwc3->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+ dwc3->dev.dma_mask = &dwc3->dev.coherent_dma_mask;
+ dwc3->dev.bus = &platform_bus_type;
+
+ ret = platform_device_add_properties(dwc3, dwc3_exynos_properties);
+ if (ret < 0) {
+ dev_err(dev, "Failed to add properties to DWC3 device\n");
+ goto dwc3_props_err;
+ }
+
+ ret = of_device_add(dwc3);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register DWC3 core device\n");
+ goto dwc3_props_err;
}
+ exynos->dwc3 = dwc3;
+ of_node_put(child);
return 0;
-populate_err:
+dwc3_props_err:
+ platform_device_put(dwc3);
+dwc3_alloc_err:
+ of_node_put(child);
+dwc3_child_err:
regulator_disable(exynos->vdd10);
vdd10_err:
regulator_disable(exynos->vdd33);
@@ -142,7 +163,8 @@ static int dwc3_exynos_remove(struct platform_device *pdev)
struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
int i;
- device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
+ of_device_unregister(exynos->dwc3);
+ platform_device_put(exynos->dwc3);
for (i = exynos->num_clks - 1; i >= 0; i--)
clk_disable_unprepare(exynos->clks[i]);
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index f55947294f7c..b526d0c78c3b 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -71,7 +71,7 @@ int dwc3_host_init(struct dwc3 *dwc)
dwc->xhci_resources[1].flags = res->flags;
dwc->xhci_resources[1].name = res->name;
- xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
+ xhci = platform_device_alloc(dwc->hcd_name, PLATFORM_DEVID_AUTO);
if (!xhci) {
dev_err(dwc->dev, "couldn't allocate xHCI device\n");
return -ENOMEM;
--
2.17.1
