Save sram context after changing MPU, DSP or core clocks

[linux-ginger.git] / drivers / usb / host / ohci-omap.c

/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2005 David Brownell
 * (C) Copyright 2002 Hewlett-Packard Company
 *
 * OMAP Bus Glue
 *
 * Modified for OMAP by Tony Lindgren <tony@atomide.com>
 * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
 * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
 *
 * This file is licenced under the GPL.
 */

#include <linux/signal.h>       /* IRQF_DISABLED */
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gpio.h>

#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/mach-types.h>

#include <plat/mux.h>
#include <mach/irqs.h>
#include <plat/fpga.h>
#include <plat/usb.h>


/* OMAP-1510 OHCI has its own MMU for DMA */
#define OMAP1510_LB_MEMSIZE     32      /* Should be same as SDRAM size */
#define OMAP1510_LB_CLOCK_DIV   0xfffec10c
#define OMAP1510_LB_MMU_CTL     0xfffec208
#define OMAP1510_LB_MMU_LCK     0xfffec224
#define OMAP1510_LB_MMU_LD_TLB  0xfffec228
#define OMAP1510_LB_MMU_CAM_H   0xfffec22c
#define OMAP1510_LB_MMU_CAM_L   0xfffec230
#define OMAP1510_LB_MMU_RAM_H   0xfffec234
#define OMAP1510_LB_MMU_RAM_L   0xfffec238


#ifndef CONFIG_ARCH_OMAP
#error "This file is OMAP bus glue.  CONFIG_OMAP must be defined."
#endif

#ifdef CONFIG_TPS65010
#include <linux/i2c/tps65010.h>
#else

#define LOW     0
#define HIGH    1

#define GPIO1   1

static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
{
        return 0;
}

#endif

extern int usb_disabled(void);
extern int ocpi_enable(void);

static struct clk *usb_host_ck;
static struct clk *usb_dc_ck;
static int host_enabled;
static int host_initialized;

static void omap_ohci_clock_power(int on)
{
        if (on) {
                clk_enable(usb_dc_ck);
                clk_enable(usb_host_ck);
                /* guesstimate for T5 == 1x 32K clock + APLL lock time */
                udelay(100);
        } else {
                clk_disable(usb_host_ck);
                clk_disable(usb_dc_ck);
        }
}

/*
 * Board specific gang-switched transceiver power on/off.
 * NOTE:  OSK supplies power from DC, not battery.
 */
static int omap_ohci_transceiver_power(int on)
{
        if (on) {
                if (machine_is_omap_innovator() && cpu_is_omap1510())
                        fpga_write(fpga_read(INNOVATOR_FPGA_CAM_USB_CONTROL)
                                | ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
                               INNOVATOR_FPGA_CAM_USB_CONTROL);
                else if (machine_is_omap_osk())
                        tps65010_set_gpio_out_value(GPIO1, LOW);
        } else {
                if (machine_is_omap_innovator() && cpu_is_omap1510())
                        fpga_write(fpga_read(INNOVATOR_FPGA_CAM_USB_CONTROL)
                                & ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
                               INNOVATOR_FPGA_CAM_USB_CONTROL);
                else if (machine_is_omap_osk())
                        tps65010_set_gpio_out_value(GPIO1, HIGH);
        }

        return 0;
}

#ifdef CONFIG_ARCH_OMAP15XX
/*
 * OMAP-1510 specific Local Bus clock on/off
 */
static int omap_1510_local_bus_power(int on)
{
        if (on) {
                omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
                udelay(200);
        } else {
                omap_writel(0, OMAP1510_LB_MMU_CTL);
        }

        return 0;
}

/*
 * OMAP-1510 specific Local Bus initialization
 * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
 *       See also arch/mach-omap/memory.h for __virt_to_dma() and
 *       __dma_to_virt() which need to match with the physical
 *       Local Bus address below.
 */
static int omap_1510_local_bus_init(void)
{
        unsigned int tlb;
        unsigned long lbaddr, physaddr;

        omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
               OMAP1510_LB_CLOCK_DIV);

        /* Configure the Local Bus MMU table */
        for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
                lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
                physaddr = tlb * 0x00100000 + PHYS_OFFSET;
                omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
                omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
                       OMAP1510_LB_MMU_CAM_L);
                omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
                omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
                omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
                omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
        }

        /* Enable the walking table */
        omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
        udelay(200);

        return 0;
}
#else
#define omap_1510_local_bus_power(x)    {}
#define omap_1510_local_bus_init()      {}
#endif

#ifdef  CONFIG_USB_OTG

static void start_hnp(struct ohci_hcd *ohci)
{
        const unsigned  port = ohci_to_hcd(ohci)->self.otg_port - 1;
        unsigned long   flags;
        u32 l;

        otg_start_hnp(ohci->transceiver);

        local_irq_save(flags);
        ohci->transceiver->state = OTG_STATE_A_SUSPEND;
        writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
        l = omap_readl(OTG_CTRL);
        l &= ~OTG_A_BUSREQ;
        omap_writel(l, OTG_CTRL);
        local_irq_restore(flags);
}

#endif

/*-------------------------------------------------------------------------*/

static int ohci_omap_init(struct usb_hcd *hcd)
{
        struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
        struct omap_usb_config  *config = hcd->self.controller->platform_data;
        int                     need_transceiver = (config->otg != 0);
        int                     ret;

        dev_dbg(hcd->self.controller, "starting USB Controller\n");

        if (config->otg) {
                ohci_to_hcd(ohci)->self.otg_port = config->otg;
                /* default/minimum OTG power budget:  8 mA */
                ohci_to_hcd(ohci)->power_budget = 8;
        }

        /* boards can use OTG transceivers in non-OTG modes */
        need_transceiver = need_transceiver
                        || machine_is_omap_h2() || machine_is_omap_h3();

        if (cpu_is_omap16xx())
                ocpi_enable();

#ifdef  CONFIG_USB_OTG
        if (need_transceiver) {
                ohci->transceiver = otg_get_transceiver();
                if (ohci->transceiver) {
                        int     status = otg_set_host(ohci->transceiver,
                                                &ohci_to_hcd(ohci)->self);
                        dev_dbg(hcd->self.controller, "init %s transceiver, status %d\n",
                                        ohci->transceiver->label, status);
                        if (status) {
                                if (ohci->transceiver)
                                        put_device(ohci->transceiver->dev);
                                return status;
                        }
                } else {
                        dev_err(hcd->self.controller, "can't find transceiver\n");
                        return -ENODEV;
                }
                ohci->start_hnp = start_hnp;
        }
#endif

        omap_ohci_clock_power(1);

        if (cpu_is_omap15xx()) {
                omap_1510_local_bus_power(1);
                omap_1510_local_bus_init();
        }

        if ((ret = ohci_init(ohci)) < 0)
                return ret;

        /* board-specific power switching and overcurrent support */
        if (machine_is_omap_osk() || machine_is_omap_innovator()) {
                u32     rh = roothub_a (ohci);

                /* power switching (ganged by default) */
                rh &= ~RH_A_NPS;

                /* TPS2045 switch for internal transceiver (port 1) */
                if (machine_is_omap_osk()) {
                        ohci_to_hcd(ohci)->power_budget = 250;

                        rh &= ~RH_A_NOCP;

                        /* gpio9 for overcurrent detction */
                        omap_cfg_reg(W8_1610_GPIO9);
                        gpio_request(9, "OHCI overcurrent");
                        gpio_direction_input(9);

                        /* for paranoia's sake:  disable USB.PUEN */
                        omap_cfg_reg(W4_USB_HIGHZ);
                }
                ohci_writel(ohci, rh, &ohci->regs->roothub.a);
                ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
        } else if (machine_is_nokia770()) {
                /* We require a self-powered hub, which should have
                 * plenty of power. */
                ohci_to_hcd(ohci)->power_budget = 0;
        }

        /* FIXME khubd hub requests should manage power switching */
        omap_ohci_transceiver_power(1);

        /* board init will have already handled HMC and mux setup.
         * any external transceiver should already be initialized
         * too, so all configured ports use the right signaling now.
         */

        return 0;
}

static void ohci_omap_stop(struct usb_hcd *hcd)
{
        dev_dbg(hcd->self.controller, "stopping USB Controller\n");
        ohci_stop(hcd);
        omap_ohci_clock_power(0);
}


/*-------------------------------------------------------------------------*/

/**
 * usb_hcd_omap_probe - initialize OMAP-based HCDs
 * Context: !in_interrupt()
 *
 * Allocates basic resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 */
static int usb_hcd_omap_probe (const struct hc_driver *driver,
                          struct platform_device *pdev)
{
        int retval, irq;
        struct usb_hcd *hcd = 0;
        struct ohci_hcd *ohci;

        if (pdev->num_resources != 2) {
                printk(KERN_ERR "hcd probe: invalid num_resources: %i\n",
                       pdev->num_resources);
                return -ENODEV;
        }

        if (pdev->resource[0].flags != IORESOURCE_MEM
                        || pdev->resource[1].flags != IORESOURCE_IRQ) {
                printk(KERN_ERR "hcd probe: invalid resource type\n");
                return -ENODEV;
        }

        usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
        if (IS_ERR(usb_host_ck))
                return PTR_ERR(usb_host_ck);

        if (!cpu_is_omap15xx())
                usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
        else
                usb_dc_ck = clk_get(&pdev->dev, "lb_ck");

        if (IS_ERR(usb_dc_ck)) {
                clk_put(usb_host_ck);
                return PTR_ERR(usb_dc_ck);
        }


        hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
        if (!hcd) {
                retval = -ENOMEM;
                goto err0;
        }
        hcd->rsrc_start = pdev->resource[0].start;
        hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;

        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
                dev_dbg(&pdev->dev, "request_mem_region failed\n");
                retval = -EBUSY;
                goto err1;
        }

        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
        if (!hcd->regs) {
                dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
                retval = -ENOMEM;
                goto err2;
        }

        ohci = hcd_to_ohci(hcd);
        ohci_hcd_init(ohci);

        host_initialized = 0;
        host_enabled = 1;

        irq = platform_get_irq(pdev, 0);
        if (irq < 0) {
                retval = -ENXIO;
                goto err3;
        }
        retval = usb_add_hcd(hcd, irq, IRQF_DISABLED);
        if (retval)
                goto err3;

        host_initialized = 1;

        if (!host_enabled)
                omap_ohci_clock_power(0);

        return 0;
err3:
        iounmap(hcd->regs);
err2:
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
        usb_put_hcd(hcd);
err0:
        clk_put(usb_dc_ck);
        clk_put(usb_host_ck);
        return retval;
}


/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_omap_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 */
static inline void
usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
{
        struct ohci_hcd         *ohci = hcd_to_ohci (hcd);

        usb_remove_hcd(hcd);
        if (ohci->transceiver) {
                (void) otg_set_host(ohci->transceiver, 0);
                put_device(ohci->transceiver->dev);
        }
        if (machine_is_omap_osk())
                gpio_free(9);
        iounmap(hcd->regs);
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        usb_put_hcd(hcd);
        clk_put(usb_dc_ck);
        clk_put(usb_host_ck);
}

/*-------------------------------------------------------------------------*/

static int
ohci_omap_start (struct usb_hcd *hcd)
{
        struct omap_usb_config *config;
        struct ohci_hcd *ohci = hcd_to_ohci (hcd);
        int             ret;

        if (!host_enabled)
                return 0;
        config = hcd->self.controller->platform_data;
        if (config->otg || config->rwc) {
                ohci->hc_control = OHCI_CTRL_RWC;
                writel(OHCI_CTRL_RWC, &ohci->regs->control);
        }

        if ((ret = ohci_run (ohci)) < 0) {
                dev_err(hcd->self.controller, "can't start\n");
                ohci_stop (hcd);
                return ret;
        }
        return 0;
}

/*-------------------------------------------------------------------------*/

static const struct hc_driver ohci_omap_hc_driver = {
        .description =          hcd_name,
        .product_desc =         "OMAP OHCI",
        .hcd_priv_size =        sizeof(struct ohci_hcd),

        /*
         * generic hardware linkage
         */
        .irq =                  ohci_irq,
        .flags =                HCD_USB11 | HCD_MEMORY,

        /*
         * basic lifecycle operations
         */
        .reset =                ohci_omap_init,
        .start =                ohci_omap_start,
        .stop =                 ohci_omap_stop,
        .shutdown =             ohci_shutdown,

        /*
         * 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,
#ifdef  CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,
#endif
        .start_port_reset =     ohci_start_port_reset,
};

/*-------------------------------------------------------------------------*/

static int ohci_hcd_omap_drv_probe(struct platform_device *dev)
{
        return usb_hcd_omap_probe(&ohci_omap_hc_driver, dev);
}

static int ohci_hcd_omap_drv_remove(struct platform_device *dev)
{
        struct usb_hcd          *hcd = platform_get_drvdata(dev);

        usb_hcd_omap_remove(hcd, dev);
        platform_set_drvdata(dev, NULL);

        return 0;
}

/*-------------------------------------------------------------------------*/

#ifdef  CONFIG_PM

static int ohci_omap_suspend(struct platform_device *dev, pm_message_t message)
{
        struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(dev));

        if (time_before(jiffies, ohci->next_statechange))
                msleep(5);
        ohci->next_statechange = jiffies;

        omap_ohci_clock_power(0);
        ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
        return 0;
}

static int ohci_omap_resume(struct platform_device *dev)
{
        struct usb_hcd  *hcd = platform_get_drvdata(dev);
        struct ohci_hcd *ohci = hcd_to_ohci(hcd);

        if (time_before(jiffies, ohci->next_statechange))
                msleep(5);
        ohci->next_statechange = jiffies;

        omap_ohci_clock_power(1);
        ohci_finish_controller_resume(hcd);
        return 0;
}

#endif

/*-------------------------------------------------------------------------*/

/*
 * Driver definition to register with the OMAP bus
 */
static struct platform_driver ohci_hcd_omap_driver = {
        .probe          = ohci_hcd_omap_drv_probe,
        .remove         = ohci_hcd_omap_drv_remove,
        .shutdown       = usb_hcd_platform_shutdown,
#ifdef  CONFIG_PM
        .suspend        = ohci_omap_suspend,
        .resume         = ohci_omap_resume,
#endif
        .driver         = {
                .owner  = THIS_MODULE,
                .name   = "ohci",
        },
};

MODULE_ALIAS("platform:ohci");