[PATCH 2/3] usb: phy: add driver for CSR SiRFSoC internal phy
Barry Song
21cnbao at gmail.com
Sat Jun 8 23:25:37 EDT 2013
From: Rong Wang <Rong.Wang at csr.com>
This patch adds a driver for CSR SiRFSoC internal phy support
for USB Controller 1.
Signed-off-by: Rong Wang <Rong.Wang at csr.com>
Signed-off-by: Barry Song <Baohua.Song at csr.com>
---
drivers/usb/phy/Kconfig | 10 ++
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/phy-sirf-usb.c | 198 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 209 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/phy/phy-sirf-usb.c
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7ef3eb8..ea30195 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -179,6 +179,16 @@ config USB_MXS_PHY
MXS Phy is used by some of the i.MX SoCs, for example imx23/28/6x.
+config USB_SIRF_PHY
+ tristate "SiRF USB PHY support"
+ depends on ARCH_SIRF
+ help
+ Say Y here if you want to build SiRF USB OTG transciever
+ driver in kernel (including Prima and Atlas series). This driver
+ implements role switch between EHCI host driver and gadget driver.
+
+ To compile this driver as a module, choose M here.
+
config USB_RCAR_PHY
tristate "Renesas R-Car USB phy support"
depends on USB || USB_GADGET
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index a9169cb..6caa29c 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_USB_ISP1301) += phy-isp1301.o
obj-$(CONFIG_USB_MSM_OTG) += phy-msm-usb.o
obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o
obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o
+obj-$(CONFIG_USB_SIRF_PHY) += phy-sirf-usb.o
obj-$(CONFIG_USB_RCAR_PHY) += phy-rcar-usb.o
obj-$(CONFIG_USB_ULPI) += phy-ulpi.o
obj-$(CONFIG_USB_ULPI_VIEWPORT) += phy-ulpi-viewport.o
diff --git a/drivers/usb/phy/phy-sirf-usb.c b/drivers/usb/phy/phy-sirf-usb.c
new file mode 100644
index 0000000..708f40c
--- /dev/null
+++ b/drivers/usb/phy/phy-sirf-usb.c
@@ -0,0 +1,198 @@
+/*
+ * USB PHY Driver for CSR SiRF SoC
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ * Rong Wang<Rong.Wang at csr.com>
+ *
+ * Licensed under GPLv2 or later.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/usb/otg.h>
+#include <linux/stmp_device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+struct sirf_phy {
+ struct usb_phy phy;
+ struct clk *clk;
+};
+
+#define DRIVER_NAME "sirf-usbphy"
+#define to_sirf_phy(p) container_of((p), struct sirf_phy, phy)
+#define USBPHY_POR BIT(27)
+
+static inline void sirf_phy_por(void __iomem *base)
+{
+ writel(readl(base) | USBPHY_POR, base);
+ udelay(15);
+ writel(readl(base) & ~USBPHY_POR, base);
+}
+
+static int sirf_phy_init(struct usb_phy *phy)
+{
+ struct sirf_phy *sirf_phy = to_sirf_phy(phy);
+
+ clk_prepare_enable(sirf_phy->clk);
+ sirf_phy_por(phy->io_priv);
+
+ return 0;
+}
+
+static void sirf_phy_shutdown(struct usb_phy *phy)
+{
+ struct sirf_phy *sirf_phy = to_sirf_phy(phy);
+ clk_disable_unprepare(sirf_phy->clk);
+}
+
+static int sirf_phy_suspend(struct usb_phy *phy, int suspend)
+{
+ return 0;
+}
+
+static int sirf_phy_on_connect(struct usb_phy *phy,
+ enum usb_device_speed speed)
+{
+ return 0;
+}
+
+static int sirf_phy_on_disconnect(struct usb_phy *phy,
+ enum usb_device_speed speed)
+{
+ return 0;
+}
+
+static int
+sirf_phy_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
+{
+ dev_info(otg->phy->dev, "set_peripheral\n");
+ if (!otg)
+ return -ENODEV;
+
+ if (!gadget) {
+ otg->gadget = NULL;
+ return -ENODEV;
+ }
+
+ otg->gadget = gadget;
+ otg->phy->state = OTG_STATE_B_IDLE;
+ return 0;
+}
+
+static int sirf_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+ dev_info(otg->phy->dev, "set_host\n");
+ if (!otg)
+ return -ENODEV;
+
+ if (!host) {
+ otg->host = NULL;
+ return -ENODEV;
+ }
+
+ otg->host = host;
+ return 0;
+}
+
+static int sirf_phy_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ void __iomem *base;
+ struct clk *clk;
+ struct sirf_phy *sirf_phy;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev,
+ "Can't get the clock, err=%ld", PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
+
+ sirf_phy = devm_kzalloc(&pdev->dev, sizeof(*sirf_phy), GFP_KERNEL);
+ if (!sirf_phy) {
+ dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
+ return -ENOMEM;
+ }
+
+ sirf_phy->phy.otg = devm_kzalloc(&pdev->dev,
+ sizeof(*sirf_phy->phy.otg), GFP_KERNEL);
+ if (!sirf_phy->phy.otg) {
+ dev_err(&pdev->dev, "Failed to allocate USB OTG structure!\n");
+ return -ENOMEM;
+ }
+
+ sirf_phy->phy.io_priv = base;
+ sirf_phy->phy.dev = &pdev->dev;
+ sirf_phy->phy.label = DRIVER_NAME;
+ sirf_phy->phy.init = sirf_phy_init;
+ sirf_phy->phy.shutdown = sirf_phy_shutdown;
+ sirf_phy->phy.set_suspend = sirf_phy_suspend;
+ sirf_phy->phy.notify_connect = sirf_phy_on_connect;
+ sirf_phy->phy.notify_disconnect = sirf_phy_on_disconnect;
+
+ sirf_phy->phy.otg->phy = &sirf_phy->phy;
+ sirf_phy->phy.otg->set_host = sirf_phy_set_host;
+ sirf_phy->phy.otg->set_peripheral = sirf_phy_set_peripheral;
+
+ ATOMIC_INIT_NOTIFIER_HEAD(&sirf_phy->phy.notifier);
+
+ sirf_phy->clk = clk;
+
+ platform_set_drvdata(pdev, &sirf_phy->phy);
+
+ ret = usb_add_phy_dev(&sirf_phy->phy);
+ if (ret)
+ return ret;
+ dev_info(&pdev->dev, "Ready\n");
+ return 0;
+}
+
+static int sirf_phy_remove(struct platform_device *pdev)
+{
+ struct sirf_phy *sirf_phy = platform_get_drvdata(pdev);
+
+ usb_remove_phy(&sirf_phy->phy);
+ return 0;
+}
+
+static const struct of_device_id sirf_phy_dt_ids[] = {
+ { .compatible = "sirf,ci13xxx-usbphy", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sirf_phy_dt_ids);
+
+static struct platform_driver sirf_phy_driver = {
+ .probe = sirf_phy_probe,
+ .remove = sirf_phy_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = sirf_phy_dt_ids,
+ },
+};
+
+static int __init sirf_phy_module_init(void)
+{
+ return platform_driver_register(&sirf_phy_driver);
+}
+postcore_initcall(sirf_phy_module_init);
+
+static void __exit sirf_phy_module_exit(void)
+{
+ platform_driver_unregister(&sirf_phy_driver);
+}
+module_exit(sirf_phy_module_exit);
+
+MODULE_ALIAS("platform:sirf-ci13xxx-usbphy");
+MODULE_AUTHOR("Rong Wang <Rong.Wang at csr.com>");
+MODULE_DESCRIPTION("SiRF CI13XXX USB PHY driver");
+MODULE_LICENSE("GPL v2");
--
1.7.5.4
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