USB host: Adding USB ehci & ohci support for spear platform

This patch adds support for ehci and ohci controller in the SPEAr platform.

Changes since V2:
added clear_tt_buffer_complete in ehci_spear_hc_driver

Signed-off-by: Deepak Sikri <deepak.sikri@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 462 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 10f985def70f..87157db155f6 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1221,6 +1221,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         vt8500_ehci_driver
 #endif
 
+#ifdef CONFIG_PLAT_SPEAR
+#include "ehci-spear.c"
+#define PLATFORM_DRIVER         spear_ehci_hcd_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
     !defined(XILINX_OF_PLATFORM_DRIVER)
diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
new file mode 100644
index 000000000000..75c00873443d
--- /dev/null
+++ b/drivers/usb/host/ehci-spear.c
@@ -0,0 +1,212 @@
+/*
+* Driver for EHCI HCD on SPEAR SOC
+*
+* Copyright (C) 2010 ST Micro Electronics,
+* Deepak Sikri <deepak.sikri@st.com>
+*
+* Based on various ehci-*.c drivers
+*
+* This file is subject to the terms and conditions of the GNU General Public
+* License. See the file COPYING in the main directory of this archive for
+* more details.
+*/
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+struct spear_ehci {
+        struct ehci_hcd ehci;
+        struct clk *clk;
+};
+
+#define to_spear_ehci(hcd)      (struct spear_ehci *)hcd_to_ehci(hcd)
+
+static void spear_start_ehci(struct spear_ehci *ehci)
+{
+        clk_enable(ehci->clk);
+}
+
+static void spear_stop_ehci(struct spear_ehci *ehci)
+{
+        clk_disable(ehci->clk);
+}
+
+static int ehci_spear_setup(struct usb_hcd *hcd)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        int retval = 0;
+
+        /* registers start at offset 0x0 */
+        ehci->caps = hcd->regs;
+        ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci,
+                                &ehci->caps->hc_capbase));
+        /* 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;
+
+        retval = ehci_init(hcd);
+        if (retval)
+                return retval;
+
+        ehci_reset(ehci);
+        ehci_port_power(ehci, 0);
+
+        return retval;
+}
+
+static const struct hc_driver ehci_spear_hc_driver = {
+        .description                    = hcd_name,
+        .product_desc                   = "SPEAr EHCI",
+        .hcd_priv_size                  = sizeof(struct spear_ehci),
+
+        /* generic hardware linkage */
+        .irq                            = ehci_irq,
+        .flags                          = HCD_MEMORY | HCD_USB2,
+
+        /* basic lifecycle operations */
+        .reset                          = ehci_spear_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,
+        .endpoint_reset                 = ehci_endpoint_reset,
+
+        /* 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,
+        .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
+};
+
+static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd ;
+        struct spear_ehci *ehci;
+        struct resource *res;
+        struct clk *usbh_clk;
+        const struct hc_driver *driver = &ehci_spear_hc_driver;
+        int *pdata = pdev->dev.platform_data;
+        int irq, retval;
+        char clk_name[20] = "usbh_clk";
+
+        if (pdata == NULL)
+                return -EFAULT;
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                retval = irq;
+                goto fail_irq_get;
+        }
+
+        if (*pdata >= 0)
+                sprintf(clk_name, "usbh.%01d_clk", *pdata);
+
+        usbh_clk = clk_get(NULL, clk_name);
+        if (IS_ERR(usbh_clk)) {
+                dev_err(&pdev->dev, "Error getting interface clock\n");
+                retval = PTR_ERR(usbh_clk);
+                goto fail_get_usbh_clk;
+        }
+
+        hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+        if (!hcd) {
+                retval = -ENOMEM;
+                goto fail_create_hcd;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                retval = -ENODEV;
+                goto fail_request_resource;
+        }
+
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = resource_size(res);
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+                                driver->description)) {
+                retval = -EBUSY;
+                goto fail_request_resource;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (hcd->regs == NULL) {
+                dev_dbg(&pdev->dev, "error mapping memory\n");
+                retval = -ENOMEM;
+                goto fail_ioremap;
+        }
+
+        ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
+        ehci->clk = usbh_clk;
+
+        spear_start_ehci(ehci);
+        retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
+        if (retval)
+                goto fail_add_hcd;
+
+        return retval;
+
+fail_add_hcd:
+        spear_stop_ehci(ehci);
+        iounmap(hcd->regs);
+fail_ioremap:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+fail_request_resource:
+        usb_put_hcd(hcd);
+fail_create_hcd:
+        clk_put(usbh_clk);
+fail_get_usbh_clk:
+fail_irq_get:
+        dev_err(&pdev->dev, "init fail, %d\n", retval);
+
+        return retval ;
+}
+
+static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct spear_ehci *ehci_p = to_spear_ehci(hcd);
+
+        if (!hcd)
+                return 0;
+        if (in_interrupt())
+                BUG();
+        usb_remove_hcd(hcd);
+
+        if (ehci_p->clk)
+                spear_stop_ehci(ehci_p);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+
+        if (ehci_p->clk)
+                clk_put(ehci_p->clk);
+
+        return 0;
+}
+
+static struct platform_driver spear_ehci_hcd_driver = {
+        .probe          = spear_ehci_hcd_drv_probe,
+        .remove         = spear_ehci_hcd_drv_remove,
+        .shutdown       = usb_hcd_platform_shutdown,
+        .driver         = {
+                .name = "spear-ehci",
+                .bus = &platform_bus_type
+        }
+};
+
+MODULE_ALIAS("platform:spear-ehci");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 5179acb7aa2f..4a4a4f025385 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1081,6 +1081,11 @@ MODULE_LICENSE ("GPL");
 #define OF_PLATFORM_DRIVER      ohci_hcd_ppc_of_driver
 #endif
 
+#ifdef CONFIG_PLAT_SPEAR
+#include "ohci-spear.c"
+#define PLATFORM_DRIVER         spear_ohci_hcd_driver
+#endif
+
 #ifdef CONFIG_PPC_PS3
 #include "ohci-ps3.c"
 #define PS3_SYSTEM_BUS_DRIVER   ps3_ohci_driver
diff --git a/drivers/usb/host/ohci-spear.c b/drivers/usb/host/ohci-spear.c
new file mode 100644
index 000000000000..4fd4bea9ac7a
--- /dev/null
+++ b/drivers/usb/host/ohci-spear.c
@@ -0,0 +1,240 @@
+/*
+* OHCI HCD (Host Controller Driver) for USB.
+*
+* Copyright (C) 2010 ST Microelectronics.
+* Deepak Sikri<deepak.sikri@st.com>
+*
+* Based on various ohci-*.c drivers
+*
+* 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/signal.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+struct spear_ohci {
+        struct ohci_hcd ohci;
+        struct clk *clk;
+};
+
+#define to_spear_ohci(hcd)      (struct spear_ohci *)hcd_to_ohci(hcd)
+
+static void spear_start_ohci(struct spear_ohci *ohci)
+{
+        clk_enable(ohci->clk);
+}
+
+static void spear_stop_ohci(struct spear_ohci *ohci)
+{
+        clk_disable(ohci->clk);
+}
+
+static int __devinit ohci_spear_start(struct usb_hcd *hcd)
+{
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        int ret;
+
+        ret = ohci_init(ohci);
+        if (ret < 0)
+                return ret;
+        ohci->regs = hcd->regs;
+
+        ret = ohci_run(ohci);
+        if (ret < 0) {
+                dev_err(hcd->self.controller, "can't start\n");
+                ohci_stop(hcd);
+                return ret;
+        }
+
+        create_debug_files(ohci);
+
+#ifdef DEBUG
+        ohci_dump(ohci, 1);
+#endif
+        return 0;
+}
+
+static const struct hc_driver ohci_spear_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "SPEAr OHCI",
+        .hcd_priv_size          = sizeof(struct spear_ohci),
+
+        /* generic hardware linkage */
+        .irq                    = ohci_irq,
+        .flags                  = HCD_USB11 | HCD_MEMORY,
+
+        /* basic lifecycle operations */
+        .start                  = ohci_spear_start,
+        .stop                   = ohci_stop,
+        .shutdown               = ohci_shutdown,
+#ifdef  CONFIG_PM
+        .bus_suspend            = ohci_bus_suspend,
+        .bus_resume             = ohci_bus_resume,
+#endif
+
+        /* managing i/o requests and associated device resources */
+        .urb_enqueue            = ohci_urb_enqueue,
+        .urb_dequeue            = ohci_urb_dequeue,
+        .endpoint_disable       = ohci_endpoint_disable,
+
+        /* scheduling support */
+        .get_frame_number       = ohci_get_frame,
+
+        /* root hub support */
+        .hub_status_data        = ohci_hub_status_data,
+        .hub_control            = ohci_hub_control,
+
+        .start_port_reset       = ohci_start_port_reset,
+};
+
+static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
+{
+        const struct hc_driver *driver = &ohci_spear_hc_driver;
+        struct usb_hcd *hcd = NULL;
+        struct clk *usbh_clk;
+        struct spear_ohci *ohci_p;
+        struct resource *res;
+        int retval, irq;
+        int *pdata = pdev->dev.platform_data;
+        char clk_name[20] = "usbh_clk";
+
+        if (pdata == NULL)
+                return -EFAULT;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                retval = irq;
+                goto fail_irq_get;
+        }
+
+        if (*pdata >= 0)
+                sprintf(clk_name, "usbh.%01d_clk", *pdata);
+
+        usbh_clk = clk_get(NULL, clk_name);
+        if (IS_ERR(usbh_clk)) {
+                dev_err(&pdev->dev, "Error getting interface clock\n");
+                retval = PTR_ERR(usbh_clk);
+                goto fail_get_usbh_clk;
+        }
+
+        hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+        if (!hcd) {
+                retval = -ENOMEM;
+                goto fail_create_hcd;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                retval = -ENODEV;
+                goto fail_request_resource;
+        }
+
+        hcd->rsrc_start = pdev->resource[0].start;
+        hcd->rsrc_len = resource_size(res);
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+                dev_dbg(&pdev->dev, "request_mem_region failed\n");
+                retval = -EBUSY;
+                goto fail_request_resource;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                dev_dbg(&pdev->dev, "ioremap failed\n");
+                retval = -ENOMEM;
+                goto fail_ioremap;
+        }
+
+        ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
+        ohci_p->clk = usbh_clk;
+        spear_start_ohci(ohci_p);
+        ohci_hcd_init(hcd_to_ohci(hcd));
+
+        retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), IRQF_DISABLED);
+        if (retval == 0)
+                return retval;
+
+        spear_stop_ohci(ohci_p);
+        iounmap(hcd->regs);
+fail_ioremap:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+fail_request_resource:
+        usb_put_hcd(hcd);
+fail_create_hcd:
+        clk_put(usbh_clk);
+fail_get_usbh_clk:
+fail_irq_get:
+        dev_err(&pdev->dev, "init fail, %d\n", retval);
+
+        return retval;
+}
+
+static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+
+        usb_remove_hcd(hcd);
+        if (ohci_p->clk)
+                spear_stop_ohci(ohci_p);
+
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+
+        if (ohci_p->clk)
+                clk_put(ohci_p->clk);
+        platform_set_drvdata(pdev, NULL);
+        return 0;
+}
+
+#if defined(CONFIG_PM)
+static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
+                pm_message_t message)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(dev);
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+
+        if (time_before(jiffies, ohci->next_statechange))
+                msleep(5);
+        ohci->next_statechange = jiffies;
+
+        spear_stop_ohci(ohci_p);
+        ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
+        return 0;
+}
+
+static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(dev);
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+
+        if (time_before(jiffies, ohci->next_statechange))
+                msleep(5);
+        ohci->next_statechange = jiffies;
+
+        spear_start_ohci(ohci_p);
+        ohci_finish_controller_resume(hcd);
+        return 0;
+}
+#endif
+
+/* Driver definition to register with the platform bus */
+static struct platform_driver spear_ohci_hcd_driver = {
+        .probe =        spear_ohci_hcd_drv_probe,
+        .remove =       spear_ohci_hcd_drv_remove,
+#ifdef CONFIG_PM
+        .suspend =      spear_ohci_hcd_drv_suspend,
+        .resume =       spear_ohci_hcd_drv_resume,
+#endif
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "spear-ohci",
+        },
+};
+
+MODULE_ALIAS("platform:spear-ohci");