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freifunkist-firmware/target/linux/sunxi/patches-3.12/153-add-sunxi-ehci.patch

499 lines
12 KiB

From b84d49247eb062672a56ce15f1c08f792099de97 Mon Sep 17 00:00:00 2001
From: arokux <arokux@gmail.com>
Date: Wed, 18 Sep 2013 21:45:03 +0200
Subject: [PATCH] ARM: sunxi: usb: Add Allwinner sunXi EHCI driver
---
drivers/usb/host/Kconfig | 9 +
drivers/usb/host/Makefile | 1 +
drivers/usb/host/ehci-sunxi.c | 446 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 456 insertions(+)
create mode 100644 drivers/usb/host/ehci-sunxi.c
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index b3f20d7..ecc2745 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -274,6 +274,15 @@ config USB_OCTEON_EHCI
USB 2.0 device support. All CN6XXX based chips with USB are
supported.
+config USB_SUNXI_EHCI
+ tristate "Allwinner sunXi EHCI support"
+ depends on ARCH_SUNXI
+ default n
+ help
+ Enable support for the Allwinner sunXi on-chip EHCI
+ controller. It is needed for high-speed (480Mbit/sec)
+ USB 2.0 device support.
+
endif # USB_EHCI_HCD
config USB_OXU210HP_HCD
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 50b0041..d2e2c8c 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_USB_EHCI_S5P) += ehci-s5p.o
obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
+obj-$(CONFIG_USB_SUNXI_EHCI) += ehci-sunxi.o
obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
diff --git a/drivers/usb/host/ehci-sunxi.c b/drivers/usb/host/ehci-sunxi.c
new file mode 100644
index 0000000..e7e15cc
--- /dev/null
+++ b/drivers/usb/host/ehci-sunxi.c
@@ -0,0 +1,446 @@
+/*
+ * Copyright (C) 2013 Roman Byshko
+ *
+ * Roman Byshko <rbyshko@gmail.com>
+ *
+ * Based on code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
+
+#define DRV_DESC "Allwinner sunXi EHCI driver"
+#define DRV_NAME "sunxi-ehci"
+
+#define SUNXI_USB_PASSBY_EN 1
+
+#define SUNXI_EHCI_AHB_ICHR8_EN BIT(10)
+#define SUNXI_EHCI_AHB_INCR4_BURST_EN BIT(9)
+#define SUNXI_EHCI_AHB_INCRX_ALIGN_EN BIT(8)
+#define SUNXI_EHCI_ULPI_BYPASS_EN BIT(0)
+
+struct sunxi_ehci_hcd {
+ struct clk *phy_clk;
+ struct clk *ahb_ehci_clk;
+ struct reset_control *reset;
+ struct regulator *vbus_reg;
+ void __iomem *csr;
+ void __iomem *pmuirq;
+ int irq;
+ int id;
+};
+
+
+static void usb_phy_write(struct sunxi_ehci_hcd *sunxi_ehci,u32 addr, u32 data, u32 len)
+{
+ u32 j = 0;
+ u32 temp = 0;
+ u32 usbc_bit = 0;
+ void __iomem *dest = sunxi_ehci->csr;
+
+ usbc_bit = BIT(sunxi_ehci->id << 1);
+
+ for (j = 0; j < len; j++) {
+ temp = readl(dest);
+
+ /* clear the address portion */
+ temp &= ~(0xff << 8);
+
+ /* set the address */
+ temp |= ((addr + j) << 8);
+ writel(temp, dest);
+
+ /* set the data bit and clear usbc bit*/
+ temp = readb(dest);
+ if (data & 0x1)
+ temp |= BIT(7);
+ else
+ temp &= ~BIT(7);
+ temp &= ~usbc_bit;
+ writeb(temp, dest);
+
+ /* flip usbc_bit */
+ __set_bit(usbc_bit, dest);
+ __clear_bit(usbc_bit, dest);
+
+ data >>= 1;
+ }
+}
+
+/* FIXME: should this function be protected by a lock?
+ * ehci1 and ehci0 could call it concurrently with same csr.
+ */
+static void sunxi_usb_phy_init(struct sunxi_ehci_hcd *sunxi_ehci)
+{
+ /* The following comments are machine
+ * translated from Chinese, you have been warned!
+ */
+
+ /* adjust PHY's magnitude and rate */
+ usb_phy_write(sunxi_ehci, 0x20, 0x14, 5);
+
+ /* threshold adjustment disconnect */
+ usb_phy_write(sunxi_ehci, 0x2a, 3, 2);
+
+ return;
+}
+
+static void sunxi_usb_passby(struct sunxi_ehci_hcd *sunxi_ehci, int enable)
+{
+ unsigned long reg_value = 0;
+ unsigned long bits = 0;
+ static DEFINE_SPINLOCK(lock);
+ unsigned long flags = 0;
+ void __iomem *addr = sunxi_ehci->pmuirq;
+
+ bits = SUNXI_EHCI_AHB_ICHR8_EN |
+ SUNXI_EHCI_AHB_INCR4_BURST_EN |
+ SUNXI_EHCI_AHB_INCRX_ALIGN_EN |
+ SUNXI_EHCI_ULPI_BYPASS_EN;
+
+ spin_lock_irqsave(&lock, flags);
+
+ reg_value = readl(addr);
+
+ if (enable)
+ reg_value |= bits;
+ else
+ reg_value &= ~bits;
+
+ writel(reg_value, addr);
+
+ spin_unlock_irqrestore(&lock, flags);
+
+ return;
+}
+
+static void sunxi_ehci_disable(struct sunxi_ehci_hcd *sunxi_ehci)
+{
+ regulator_disable(sunxi_ehci->vbus_reg);
+
+ sunxi_usb_passby(sunxi_ehci, !SUNXI_USB_PASSBY_EN);
+
+ clk_disable_unprepare(sunxi_ehci->ahb_ehci_clk);
+ clk_disable_unprepare(sunxi_ehci->phy_clk);
+
+ reset_control_assert(sunxi_ehci->reset);
+}
+
+static int sunxi_ehci_enable(struct sunxi_ehci_hcd *sunxi_ehci)
+{
+ int ret;
+
+ ret = clk_prepare_enable(sunxi_ehci->phy_clk);
+ if (ret)
+ return ret;
+
+ ret = reset_control_deassert(sunxi_ehci->reset);
+ if (ret)
+ goto fail1;
+
+ ret = clk_prepare_enable(sunxi_ehci->ahb_ehci_clk);
+ if (ret)
+ goto fail2;
+
+ sunxi_usb_phy_init(sunxi_ehci);
+
+ sunxi_usb_passby(sunxi_ehci, SUNXI_USB_PASSBY_EN);
+
+ ret = regulator_enable(sunxi_ehci->vbus_reg);
+ if (ret)
+ goto fail3;
+
+ return 0;
+
+fail3:
+ clk_disable_unprepare(sunxi_ehci->ahb_ehci_clk);
+fail2:
+ reset_control_assert(sunxi_ehci->reset);
+fail1:
+ clk_disable_unprepare(sunxi_ehci->phy_clk);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM
+static int sunxi_ehci_suspend(struct device *dev)
+{
+ struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ int ret;
+
+ bool do_wakeup = device_may_wakeup(dev);
+
+ ret = ehci_suspend(hcd, do_wakeup);
+
+ sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+ sunxi_ehci_disable(sunxi_ehci);
+
+ return ret;
+}
+
+static int sunxi_ehci_resume(struct device *dev)
+{
+ struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ int ret;
+
+ sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+ ret = sunxi_ehci_enable(sunxi_ehci);
+ if (ret)
+ return ret;
+
+ return ehci_resume(hcd, false);
+}
+
+
+static const struct dev_pm_ops sunxi_ehci_pmops = {
+ .suspend = sunxi_ehci_suspend,
+ .resume = sunxi_ehci_resume,
+};
+
+#define SUNXI_EHCI_PMOPS (&sunxi_ehci_pmops)
+#else /* !CONFIG_PM */
+#define SUNXI_EHCI_PMOPS NULL
+#endif /* CONFIG_PM */
+
+static const struct ehci_driver_overrides sunxi_overrides __initconst = {
+ .reset = NULL,
+ .extra_priv_size = sizeof(struct sunxi_ehci_hcd),
+};
+
+/* FIXME: Should there be two instances of hc_driver,
+ * or one is enough to handle two EHCI controllers? */
+static struct hc_driver __read_mostly sunxi_ehci_hc_driver;
+
+static int sunxi_ehci_init(struct platform_device *pdev, struct usb_hcd *hcd,
+ struct sunxi_ehci_hcd *sunxi_ehci)
+{
+ void __iomem *ehci_regs = NULL;
+ struct resource *res = NULL;
+
+ sunxi_ehci->vbus_reg = devm_regulator_get(&pdev->dev, "vbus");
+ if (IS_ERR(sunxi_ehci->vbus_reg)) {
+ if (PTR_ERR(sunxi_ehci->vbus_reg) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ dev_info(&pdev->dev, "no USB VBUS power supply found\n");
+ }
+
+ sunxi_ehci->id = of_alias_get_id(pdev->dev.of_node, "ehci");
+ if (sunxi_ehci->id < 0)
+ return sunxi_ehci->id;
+
+ /* FIXME: should res be freed on some failure? */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to get I/O memory\n");
+ return -ENXIO;
+ }
+ ehci_regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ehci_regs))
+ return PTR_ERR(ehci_regs);
+
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+ hcd->regs = ehci_regs;
+ hcd_to_ehci(hcd)->caps = ehci_regs;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to get I/O memory\n");
+ return -ENXIO;
+ }
+ sunxi_ehci->pmuirq = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(sunxi_ehci->pmuirq))
+ return PTR_ERR(sunxi_ehci->pmuirq);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to get I/O memory\n");
+ return -ENXIO;
+ }
+
+ /* FIXME: this one byte needs to be shared between both EHCIs,
+ * that is why ioremap instead of devm_ioremap_resource,
+ * memory is not unmaped back for now.
+ */
+ sunxi_ehci->csr = ioremap(res->start, resource_size(res));
+ if (IS_ERR(sunxi_ehci->csr)) {
+ dev_err(&pdev->dev, "failed to remap memory\n");
+ return PTR_ERR(sunxi_ehci->csr);
+ }
+
+ sunxi_ehci->irq = platform_get_irq(pdev, 0);
+ if (!sunxi_ehci->irq) {
+ dev_err(&pdev->dev, "failed to get IRQ\n");
+ return -ENODEV;
+ }
+
+ sunxi_ehci->phy_clk = devm_clk_get(&pdev->dev, "usb_phy");
+ if (IS_ERR(sunxi_ehci->phy_clk)) {
+ dev_err(&pdev->dev, "failed to get usb_phy clock\n");
+ return PTR_ERR(sunxi_ehci->phy_clk);
+ }
+ sunxi_ehci->ahb_ehci_clk = devm_clk_get(&pdev->dev, "ahb_ehci");
+ if (IS_ERR(sunxi_ehci->ahb_ehci_clk)) {
+ dev_err(&pdev->dev, "failed to get ahb_ehci clock\n");
+ return PTR_ERR(sunxi_ehci->ahb_ehci_clk);
+ }
+
+ sunxi_ehci->reset = reset_control_get(&pdev->dev, "ehci_reset");
+ if (IS_ERR(sunxi_ehci->reset))
+ {
+ dev_err(&pdev->dev, "failed to get ehci_reset reset line\n");
+ return PTR_ERR(sunxi_ehci->reset);
+ }
+
+ return 0;
+}
+
+static int sunxi_ehci_probe(struct platform_device *pdev)
+{
+ struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+ struct usb_hcd *hcd = NULL;
+ int ret;
+
+ if (pdev->num_resources != 4) {
+ dev_err(&pdev->dev, "invalid number of resources: %i\n",
+ pdev->num_resources);
+ return -ENODEV;
+ }
+
+ if (pdev->resource[0].flags != IORESOURCE_MEM
+ || pdev->resource[1].flags != IORESOURCE_MEM
+ || pdev->resource[2].flags != IORESOURCE_MEM
+ || pdev->resource[3].flags != IORESOURCE_IRQ) {
+ dev_err(&pdev->dev, "invalid resource type\n");
+ return -ENODEV;
+ }
+
+ if (!pdev->dev.dma_mask)
+ pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+ if (!pdev->dev.coherent_dma_mask)
+ pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+ hcd = usb_create_hcd(&sunxi_ehci_hc_driver, &pdev->dev,
+ dev_name(&pdev->dev));
+ if (!hcd) {
+ dev_err(&pdev->dev, "unable to create HCD\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, hcd);
+
+ sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+ ret = sunxi_ehci_init(pdev, hcd, sunxi_ehci);
+ if (ret)
+ goto fail1;
+
+ ret = sunxi_ehci_enable(sunxi_ehci);
+ if (ret)
+ goto fail1;
+
+ ret = usb_add_hcd(hcd, sunxi_ehci->irq, IRQF_SHARED | IRQF_DISABLED);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add USB HCD\n");
+ goto fail2;
+ }
+
+ return 0;
+
+fail2:
+ sunxi_ehci_disable(sunxi_ehci);
+
+fail1:
+ usb_put_hcd(hcd);
+ return ret;
+}
+
+static int sunxi_ehci_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+
+ sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+ usb_remove_hcd(hcd);
+
+ sunxi_ehci_disable(sunxi_ehci);
+
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+static void sunxi_ehci_shutdown(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+
+ sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+ usb_hcd_platform_shutdown(pdev);
+
+ sunxi_ehci_disable(sunxi_ehci);
+}
+
+static const struct of_device_id ehci_of_match[] = {
+ {.compatible = "allwinner,sunxi-ehci"},
+ {},
+};
+
+static struct platform_driver ehci_sunxi_driver = {
+ .driver = {
+ .of_match_table = ehci_of_match,
+ .name = DRV_NAME,
+ .pm = SUNXI_EHCI_PMOPS,
+ },
+ .probe = sunxi_ehci_probe,
+ .remove = sunxi_ehci_remove,
+ .shutdown = sunxi_ehci_shutdown,
+};
+
+static int __init sunxi_ehci_init_module(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info(DRV_NAME ": " DRV_DESC "\n");
+
+ ehci_init_driver(&sunxi_ehci_hc_driver, &sunxi_overrides);
+
+ return platform_driver_register(&ehci_sunxi_driver);
+}
+module_init(sunxi_ehci_init_module);
+
+static void __exit sunxi_ehci_exit_module(void)
+{
+ platform_driver_unregister(&ehci_sunxi_driver);
+}
+module_exit(sunxi_ehci_exit_module);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, ehci_of_match);
+MODULE_AUTHOR("Roman Byshko <rbyshko@gmail.com>");
--
1.8.4