The Freescale MX27 and MX31 SoCs have a EHCI controller onboard.
The controller is capable of USB on the go. This patch adds
support for the host controller only.
The USB OTG core used here is the ARC core, so the driver should
be renamed.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/plat-mxc/include/mach/mxc_ehci.h | 9 +
drivers/usb/Kconfig | 1 +
drivers/usb/host/Kconfig | 7 +
drivers/usb/host/ehci-hcd.c | 5 +
drivers/usb/host/ehci-mxc.c | 246 +++++++++++++++++++++++++++++
5 files changed, 268 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/plat-mxc/include/mach/mxc_ehci.h
create mode 100644 drivers/usb/host/ehci-mxc.c
diff --git a/arch/arm/plat-mxc/include/mach/mxc_ehci.h b/arch/arm/plat-mxc/include/mach/mxc_ehci.h
new file mode 100644
index 0000000..a6d2957
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/mxc_ehci.h
@@ -0,0 +1,9 @@
+#ifndef __INCLUDE_ASM_ARCH_MXC_EHCI_H
+#define __INCLUDE_ASM_ARCH_MXC_EHCI_H
+
+struct mxc_usbh_platform_data {
+ int (*init)(struct platform_device *pdev);
+ int (*exit)(struct platform_device *pdev);
+};
+#endif /* __INCLUDE_ASM_ARCH_MXC_EHCI_H */
+
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index c6c816b..86a85c3 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -57,6 +57,7 @@ config USB_ARCH_HAS_EHCI
default y if PPC_83xx
default y if SOC_AU1200
default y if ARCH_IXP4XX
+ default y if ARCH_MXC
default PCI
# ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 845479f..5d7ecf1 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -85,6 +85,13 @@ config USB_EHCI_FSL
---help---
Variation of ARC USB block used in some Freescale chips.
+config USB_EHCI_MXC
+ bool "Support for Freescale on-chip EHCI USB controller"
+ depends on USB_EHCI_HCD && ARCH_MXC
+ select USB_EHCI_ROOT_HUB_TT
+ ---help---
+ Variation of ARC USB block used in some Freescale chips.
+
config USB_EHCI_HCD_PPC_OF
bool "EHCI support for PPC USB controller on OF platform bus"
depends on USB_EHCI_HCD && PPC_OF
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c637207..808b5d4 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1047,6 +1047,11 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ehci_fsl_driver
#endif
+#ifdef CONFIG_USB_EHCI_MXC
+#include "ehci-mxc.c"
+#define PLATFORM_DRIVER ehci_mxc_driver
+#endif
+
#ifdef CONFIG_SOC_AU1200
#include "ehci-au1xxx.c"
#define PLATFORM_DRIVER ehci_hcd_au1xxx_driver
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c
new file mode 100644
index 0000000..e65e6ed
--- /dev/null
+++ b/drivers/usb/host/ehci-mxc.c
@@ -0,0 +1,246 @@
+/*
+ * Copyright (c) 2008 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <mach/mxc_ehci.h>
+
+struct ehci_mxc_priv {
+ struct clk *usbclk, *ahbclk;
+ struct usb_hcd *hcd;
+};
+
+/* called during probe() after chip reset completes */
+static int ehci_mxc_setup(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int retval;
+
+ /* EHCI registers start at offset 0x100 */
+ ehci->caps = hcd->regs + 0x100;
+ ehci->regs = hcd->regs + 0x100 +
+ HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+ dbg_hcs_params(ehci, "reset");
+ dbg_hcc_params(ehci, "reset");
+
+ /* cache this readonly data; minimize chip reads */
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+ retval = ehci_halt(ehci);
+ if (retval)
+ return retval;
+
+ /* data structure init */
+ retval = ehci_init(hcd);
+ if (retval)
+ return retval;
+
+ hcd->has_tt = 1;
+
+ ehci->sbrn = 0x20;
+
+ ehci_reset(ehci);
+
+ ehci_port_power(ehci, 0);
+ return 0;
+}
+
+static const struct hc_driver ehci_mxc_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "Freescale On-Chip EHCI Host Controller",
+ .hcd_priv_size = sizeof(struct ehci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ehci_irq,
+ .flags = HCD_USB2 | HCD_MEMORY,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ehci_mxc_setup,
+ .start = ehci_run,
+ .stop = ehci_stop,
+ .shutdown = ehci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ehci_urb_enqueue,
+ .urb_dequeue = ehci_urb_dequeue,
+ .endpoint_disable = ehci_endpoint_disable,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ehci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ehci_hub_status_data,
+ .hub_control = ehci_hub_control,
+ .bus_suspend = ehci_bus_suspend,
+ .bus_resume = ehci_bus_resume,
+ .relinquish_port = ehci_relinquish_port,
+ .port_handed_over = ehci_port_handed_over,
+};
+
+static int ehci_mxc_drv_probe(struct platform_device *pdev)
+{
+ struct mxc_usbh_platform_data *pdata;
+ struct usb_hcd *hcd;
+ struct resource *res;
+ int irq, ret, temp;
+ struct ehci_mxc_priv *priv;
+
+ dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
+
+ pdata = (struct mxc_usbh_platform_data *)pdev->dev.platform_data;
+
+ irq = platform_get_irq(pdev, 0);
+
+ hcd = usb_create_hcd(&ehci_mxc_hc_driver, &pdev->dev, dev_name(&pdev->dev));
+ if (!hcd)
+ return -ENOMEM;
+
+ priv = kzalloc(sizeof (*priv), GFP_KERNEL);
+ if (!priv) {
+ ret = -ENOMEM;
+ goto err_alloc;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "Found HC with no register addr. Check setup!\n");
+ ret = -ENODEV;
+ goto err_get_resource;
+ }
+
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ dev_dbg(&pdev->dev, "controller already in use\n");
+ ret = -EBUSY;
+ goto err_request_mem;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ dev_err(&pdev->dev, "error mapping memory\n");
+ ret = -EFAULT;
+ goto err_ioremap;
+ }
+
+ priv->usbclk = clk_get(&pdev->dev, "usb");
+ if (IS_ERR(priv->usbclk)) {
+ ret = PTR_ERR(priv->usbclk);
+ goto err_clk;
+ }
+ clk_enable(priv->usbclk);
+
+ if (!cpu_is_mx35()) {
+ priv->ahbclk = clk_get(&pdev->dev, "usb_ahb");
+ if (IS_ERR(priv->ahbclk)) {
+ ret = PTR_ERR(priv->ahbclk);
+ goto err_clk_ahb;
+ }
+ clk_enable(priv->ahbclk);
+ }
+
+ if (pdata && pdata->init) {
+ ret = pdata->init(pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "platform init failed\n");
+ goto err_init;
+ }
+ }
+
+ /* Set to Host mode */
+ temp = readl(hcd->regs + 0x1a8);
+ writel(temp | 0x3, hcd->regs + 0x1a8);
+
+ priv->hcd = hcd;
+ platform_set_drvdata(pdev, priv);
+
+ ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+ if (ret)
+ goto err_add;
+
+ return 0;
+
+err_add:
+ if (pdata && pdata->exit)
+ pdata->exit(pdev);
+err_init:
+ if (priv->ahbclk) {
+ clk_disable(priv->ahbclk);
+ clk_put(priv->ahbclk);
+ }
+err_clk_ahb:
+ clk_disable(priv->usbclk);
+ clk_put(priv->usbclk);
+err_clk:
+ iounmap(hcd->regs);
+err_ioremap:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_request_mem:
+err_get_resource:
+ kfree(priv);
+err_alloc:
+ usb_put_hcd(hcd);
+ return ret;
+}
+
+static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
+{
+ struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
+ struct usb_hcd *hcd = priv->hcd;
+
+ usb_remove_hcd(hcd);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+ platform_set_drvdata(pdev, NULL);
+
+ clk_disable(priv->usbclk);
+ clk_put(priv->usbclk);
+ if (priv->ahbclk) {
+ clk_disable(priv->ahbclk);
+ clk_put(priv->ahbclk);
+ }
+
+ kfree(priv);
+
+ return 0;
+}
+
+MODULE_ALIAS("platform:mxc-ehci");
+
+static struct platform_driver ehci_mxc_driver = {
+ .probe = ehci_mxc_drv_probe,
+ .remove = __exit_p(ehci_mxc_drv_remove),
+ .shutdown = usb_hcd_platform_shutdown,
+ .driver = {
+ .name = "mxc-ehci",
+ },
+};
--
1.6.2.1
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
