This patch adds the glue code required to ensure the on-chip EHCI
controller works on RZ/G1C(a.k.a R8A77470) SoC's from Renesas.
Signed-off-by: Biju Das <biju.das@xxxxxxxxxxxxxx>
---
V1-->V2
* New patch
---
drivers/usb/host/Kconfig | 9 ++
drivers/usb/host/Makefile | 1 +
drivers/usb/host/ehci-r8a77470.c | 327 +++++++++++++++++++++++++++++++++++++++
3 files changed, 337 insertions(+)
create mode 100644 drivers/usb/host/ehci-r8a77470.c
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index d809671..a474aa9 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -237,6 +237,15 @@ config USB_EHCI_HCD_STI
Enable support for the on-chip EHCI controller found on
STMicroelectronics consumer electronics SoC's.
+config USB_EHCI_HCD_R8A77470
+ tristate "Support for Renesas R8A77470 on-chip EHCI USB controller"
+ depends on ARCH_R8A77470 && OF
+ select GENERIC_PHY
+ select USB_EHCI_HCD_PLATFORM
+ help
+ Enable support for the on-chip EHCI controller found on
+ Renesas RZ/G1C(R8A77470) SoC's.
+
config USB_EHCI_HCD_AT91
tristate "Support for Atmel on-chip EHCI USB controller"
depends on USB_EHCI_HCD && ARCH_AT91
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 84514f7..785a1d1 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_USB_EHCI_HCD_OMAP) += ehci-omap.o
obj-$(CONFIG_USB_EHCI_HCD_ORION) += ehci-orion.o
obj-$(CONFIG_USB_EHCI_HCD_SPEAR) += ehci-spear.o
obj-$(CONFIG_USB_EHCI_HCD_STI) += ehci-st.o
+obj-$(CONFIG_USB_EHCI_HCD_R8A77470) += ehci-r8a77470.o
obj-$(CONFIG_USB_EHCI_EXYNOS) += ehci-exynos.o
obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
diff --git a/drivers/usb/host/ehci-r8a77470.c b/drivers/usb/host/ehci-r8a77470.c
new file mode 100644
index 0000000..d57f6f1
--- /dev/null
+++ b/drivers/usb/host/ehci-r8a77470.c
@@ -0,0 +1,327 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas R8A77470 ehci driver
+ *
+ * Copyright (C) 2019 Renesas Electronics Corp.
+ *
+ * Derived from ehci-platform.c
+ */
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hrtimer.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/ehci_pdriver.h>
+#include <linux/usb/of.h>
+
+#include "ehci.h"
+
+/******* USB2.0 Host registers (original offset is +0x100) *******/
+#define USB2_INT_ENABLE 0x100
+#define USB2_SPD_RSM_TIMSET 0x20c
+#define USB2_OC_TIMSET 0x210
+
+#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2)
+#define USB2_INT_ENABLE_USBH_INTA_EN BIT(1)
+#define USB2_INT_ENABLE_INIT (USB2_INT_ENABLE_USBH_INTB_EN | \
+ USB2_INT_ENABLE_USBH_INTA_EN)
+
+#define USB2_SPD_RSM_TIMSET_INIT 0x014e029b
+#define USB2_OC_TIMSET_INIT 0x000209ab
+
+#define DRIVER_DESC "EHCI renesas r8a77470 driver"
+#define EHCI_MAX_CLKS 4
+#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
+
+struct ehci_platform_priv {
+ struct clk *clks[EHCI_MAX_CLKS];
+ struct reset_control *rsts;
+ bool reset_on_resume;
+};
+
+static const char hcd_name[] = "ehci-r8a77470";
+
+static int r8a77470_ehci_platform_reset(struct usb_hcd *hcd)
+{
+ struct platform_device *pdev = to_platform_device(hcd->self.controller);
+ struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+ ehci->caps = hcd->regs + pdata->caps_offset;
+ return ehci_setup(hcd);
+}
+
+static int r8a77470_ehci_platform_power_on(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
+ int clk, ret;
+
+ for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
+ ret = clk_prepare_enable(priv->clks[clk]);
+ if (ret)
+ goto err_disable_clks;
+ }
+
+ writel(USB2_INT_ENABLE_INIT, hcd->regs + USB2_INT_ENABLE);
+ writel(USB2_SPD_RSM_TIMSET_INIT, hcd->regs + USB2_SPD_RSM_TIMSET);
+ writel(USB2_OC_TIMSET_INIT, hcd->regs + USB2_OC_TIMSET);
+ return 0;
+
+err_disable_clks:
+ while (--clk >= 0)
+ clk_disable_unprepare(priv->clks[clk]);
+
+ return ret;
+}
+
+static void r8a77470_ehci_platform_power_off(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
+ int clk;
+
+ writel(0, hcd->regs + USB2_INT_ENABLE);
+ for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
+ if (priv->clks[clk])
+ clk_disable_unprepare(priv->clks[clk]);
+}
+
+static struct hc_driver __read_mostly ehci_platform_hc_driver;
+
+static const struct ehci_driver_overrides platform_overrides __initconst = {
+ .reset = r8a77470_ehci_platform_reset,
+ .extra_priv_size = sizeof(struct ehci_platform_priv),
+};
+
+static struct usb_ehci_pdata ehci_platform_defaults = {
+ .power_on = r8a77470_ehci_platform_power_on,
+ .power_suspend = r8a77470_ehci_platform_power_off,
+ .power_off = r8a77470_ehci_platform_power_off,
+};
+
+static int r8a77470_ehci_platform_probe(struct platform_device *dev)
+{
+ struct usb_hcd *hcd;
+ struct resource *res_mem;
+ struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
+ struct ehci_platform_priv *priv;
+ struct ehci_hcd *ehci;
+ int err, irq, clk = 0;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ /*
+ * Use reasonable defaults so platforms don't have to provide these
+ * with DT probing on ARM.
+ */
+ if (!pdata)
+ pdata = &ehci_platform_defaults;
+
+ err = dma_coerce_mask_and_coherent(&dev->dev,
+ pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
+ if (err) {
+ dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
+ return err;
+ }
+
+ irq = platform_get_irq(dev, 0);
+ if (irq < 0) {
+ dev_err(&dev->dev, "no irq provided");
+ return irq;
+ }
+
+ hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
+ dev_name(&dev->dev));
+ if (!hcd)
+ return -ENOMEM;
+
+ platform_set_drvdata(dev, hcd);
+ dev->dev.platform_data = pdata;
+ priv = hcd_to_ehci_priv(hcd);
+ ehci = hcd_to_ehci(hcd);
+
+ if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
+ for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
+ priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
+ if (IS_ERR(priv->clks[clk])) {
+ err = PTR_ERR(priv->clks[clk]);
+ if (err == -EPROBE_DEFER)
+ goto err_put_clks;
+ priv->clks[clk] = NULL;
+ break;
+ }
+ }
+ }
+
+ priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
+ if (IS_ERR(priv->rsts)) {
+ err = PTR_ERR(priv->rsts);
+ goto err_put_clks;
+ }
+
+ err = reset_control_deassert(priv->rsts);
+ if (err)
+ goto err_put_clks;
+
+ res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
+ if (IS_ERR(hcd->regs)) {
+ err = PTR_ERR(hcd->regs);
+ goto err_reset;
+ }
+ hcd->rsrc_start = res_mem->start;
+ hcd->rsrc_len = resource_size(res_mem);
+
+ if (pdata->power_on) {
+ err = pdata->power_on(dev);
+ if (err < 0)
+ goto err_reset;
+ }
+
+ err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (err)
+ goto err_power;
+
+ device_wakeup_enable(hcd->self.controller);
+ device_enable_async_suspend(hcd->self.controller);
+ platform_set_drvdata(dev, hcd);
+
+ return err;
+
+err_power:
+ if (pdata->power_off)
+ pdata->power_off(dev);
+err_reset:
+ reset_control_assert(priv->rsts);
+err_put_clks:
+ while (--clk >= 0)
+ clk_put(priv->clks[clk]);
+
+ if (pdata == &ehci_platform_defaults)
+ dev->dev.platform_data = NULL;
+
+ usb_put_hcd(hcd);
+
+ return err;
+}
+
+static int r8a77470_ehci_platform_remove(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
+ struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
+ int clk;
+
+ usb_remove_hcd(hcd);
+
+ if (pdata->power_off)
+ pdata->power_off(dev);
+
+ reset_control_assert(priv->rsts);
+
+ for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
+ clk_put(priv->clks[clk]);
+
+ usb_put_hcd(hcd);
+
+ if (pdata == &ehci_platform_defaults)
+ dev->dev.platform_data = NULL;
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ehci_platform_suspend(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
+ struct platform_device *pdev = to_platform_device(dev);
+ bool do_wakeup = device_may_wakeup(dev);
+ int ret;
+
+ ret = ehci_suspend(hcd, do_wakeup);
+ if (ret)
+ return ret;
+
+ if (pdata->power_suspend)
+ pdata->power_suspend(pdev);
+
+ return ret;
+}
+
+static int ehci_platform_resume(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
+ struct device *companion_dev;
+ int err;
+
+ if (pdata->power_on) {
+ err = pdata->power_on(pdev);
+ if (err < 0)
+ return err;
+ }
+
+ companion_dev = usb_of_get_companion_dev(hcd->self.controller);
+ if (companion_dev) {
+ device_pm_wait_for_dev(hcd->self.controller, companion_dev);
+ put_device(companion_dev);
+ }
+
+ ehci_resume(hcd, priv->reset_on_resume);
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct of_device_id r8a77470_ehci_ids[] = {
+ { .compatible = "renesas,ehci-r8a77470", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, r8a77470_ehci_ids);
+
+static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
+ ehci_platform_resume);
+
+static struct platform_driver ehci_platform_driver = {
+ .probe = r8a77470_ehci_platform_probe,
+ .remove = r8a77470_ehci_platform_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+ .driver = {
+ .name = "r8a77470-ehci",
+ .pm = &ehci_platform_pm_ops,
+ .of_match_table = r8a77470_ehci_ids,
+ }
+};
+
+static int __init ehci_platform_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+ ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
+ return platform_driver_register(&ehci_platform_driver);
+}
+module_init(ehci_platform_init);
+
+static void __exit ehci_platform_cleanup(void)
+{
+ platform_driver_unregister(&ehci_platform_driver);
+}
+module_exit(ehci_platform_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Biju Das <biju.das@xxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.7.4
