diff options
Diffstat (limited to 'kernel/drivers/usb/musb/ux500.c')
| -rw-r--r-- | kernel/drivers/usb/musb/ux500.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/kernel/drivers/usb/musb/ux500.c b/kernel/drivers/usb/musb/ux500.c new file mode 100644 index 000000000..abf727288 --- /dev/null +++ b/kernel/drivers/usb/musb/ux500.c @@ -0,0 +1,391 @@ +/* + * Copyright (C) 2010 ST-Ericsson AB + * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> + * + * Based on omap2430.c + * + * 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/module.h> +#include <linux/kernel.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/usb/musb-ux500.h> + +#include "musb_core.h" + +static struct musb_hdrc_config ux500_musb_hdrc_config = { + .multipoint = true, + .dyn_fifo = true, + .num_eps = 16, + .ram_bits = 16, +}; + +struct ux500_glue { + struct device *dev; + struct platform_device *musb; + struct clk *clk; +}; +#define glue_to_musb(g) platform_get_drvdata(g->musb) + +static void ux500_musb_set_vbus(struct musb *musb, int is_on) +{ + u8 devctl; + unsigned long timeout = jiffies + msecs_to_jiffies(1000); + /* HDRC controls CPEN, but beware current surges during device + * connect. They can trigger transient overcurrent conditions + * that must be ignored. + */ + + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + + if (is_on) { + if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) { + /* start the session */ + devctl |= MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + /* + * Wait for the musb to set as A device to enable the + * VBUS + */ + while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { + + if (time_after(jiffies, timeout)) { + dev_err(musb->controller, + "configured as A device timeout"); + break; + } + } + + } else { + musb->is_active = 1; + musb->xceiv->otg->default_a = 1; + musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; + devctl |= MUSB_DEVCTL_SESSION; + MUSB_HST_MODE(musb); + } + } else { + musb->is_active = 0; + + /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping + * right to B_IDLE... + */ + musb->xceiv->otg->default_a = 0; + devctl &= ~MUSB_DEVCTL_SESSION; + MUSB_DEV_MODE(musb); + } + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + /* + * Devctl values will be updated after vbus goes below + * session_valid. The time taken depends on the capacitance + * on VBUS line. The max discharge time can be upto 1 sec + * as per the spec. Typically on our platform, it is 200ms + */ + if (!is_on) + mdelay(200); + + dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", + usb_otg_state_string(musb->xceiv->otg->state), + musb_readb(musb->mregs, MUSB_DEVCTL)); +} + +static int musb_otg_notifications(struct notifier_block *nb, + unsigned long event, void *unused) +{ + struct musb *musb = container_of(nb, struct musb, nb); + + dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n", + event, usb_otg_state_string(musb->xceiv->otg->state)); + + switch (event) { + case UX500_MUSB_ID: + dev_dbg(musb->controller, "ID GND\n"); + ux500_musb_set_vbus(musb, 1); + break; + case UX500_MUSB_VBUS: + dev_dbg(musb->controller, "VBUS Connect\n"); + break; + case UX500_MUSB_NONE: + dev_dbg(musb->controller, "VBUS Disconnect\n"); + if (is_host_active(musb)) + ux500_musb_set_vbus(musb, 0); + else + musb->xceiv->otg->state = OTG_STATE_B_IDLE; + break; + default: + dev_dbg(musb->controller, "ID float\n"); + return NOTIFY_DONE; + } + return NOTIFY_OK; +} + +static irqreturn_t ux500_musb_interrupt(int irq, void *__hci) +{ + unsigned long flags; + irqreturn_t retval = IRQ_NONE; + struct musb *musb = __hci; + + spin_lock_irqsave(&musb->lock, flags); + + musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); + musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); + musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); + + if (musb->int_usb || musb->int_tx || musb->int_rx) + retval = musb_interrupt(musb); + + spin_unlock_irqrestore(&musb->lock, flags); + + return retval; +} + +static int ux500_musb_init(struct musb *musb) +{ + int status; + + musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); + if (IS_ERR_OR_NULL(musb->xceiv)) { + pr_err("HS USB OTG: no transceiver configured\n"); + return -EPROBE_DEFER; + } + + musb->nb.notifier_call = musb_otg_notifications; + status = usb_register_notifier(musb->xceiv, &musb->nb); + if (status < 0) { + dev_dbg(musb->controller, "notification register failed\n"); + return status; + } + + musb->isr = ux500_musb_interrupt; + + return 0; +} + +static int ux500_musb_exit(struct musb *musb) +{ + usb_unregister_notifier(musb->xceiv, &musb->nb); + + usb_put_phy(musb->xceiv); + + return 0; +} + +static const struct musb_platform_ops ux500_ops = { + .quirks = MUSB_INDEXED_EP, + .init = ux500_musb_init, + .exit = ux500_musb_exit, + .fifo_mode = 5, + + .set_vbus = ux500_musb_set_vbus, +}; + +static struct musb_hdrc_platform_data * +ux500_of_probe(struct platform_device *pdev, struct device_node *np) +{ + struct musb_hdrc_platform_data *pdata; + const char *mode; + int strlen; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + mode = of_get_property(np, "dr_mode", &strlen); + if (!mode) { + dev_err(&pdev->dev, "No 'dr_mode' property found\n"); + return NULL; + } + + if (strlen > 0) { + if (!strcmp(mode, "host")) + pdata->mode = MUSB_HOST; + if (!strcmp(mode, "otg")) + pdata->mode = MUSB_OTG; + if (!strcmp(mode, "peripheral")) + pdata->mode = MUSB_PERIPHERAL; + } + + return pdata; +} + +static int ux500_probe(struct platform_device *pdev) +{ + struct resource musb_resources[2]; + struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct device_node *np = pdev->dev.of_node; + struct platform_device *musb; + struct ux500_glue *glue; + struct clk *clk; + int ret = -ENOMEM; + + if (!pdata) { + if (np) { + pdata = ux500_of_probe(pdev, np); + if (!pdata) + goto err0; + + pdev->dev.platform_data = pdata; + } else { + dev_err(&pdev->dev, "no pdata or device tree found\n"); + goto err0; + } + } + + glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); + if (!glue) + goto err0; + + musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); + if (!musb) { + dev_err(&pdev->dev, "failed to allocate musb device\n"); + goto err0; + } + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "failed to get clock\n"); + ret = PTR_ERR(clk); + goto err1; + } + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock\n"); + goto err1; + } + + musb->dev.parent = &pdev->dev; + musb->dev.dma_mask = &pdev->dev.coherent_dma_mask; + musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask; + + glue->dev = &pdev->dev; + glue->musb = musb; + glue->clk = clk; + + pdata->platform_ops = &ux500_ops; + pdata->config = &ux500_musb_hdrc_config; + + platform_set_drvdata(pdev, glue); + + memset(musb_resources, 0x00, sizeof(*musb_resources) * + ARRAY_SIZE(musb_resources)); + + musb_resources[0].name = pdev->resource[0].name; + musb_resources[0].start = pdev->resource[0].start; + musb_resources[0].end = pdev->resource[0].end; + musb_resources[0].flags = pdev->resource[0].flags; + + musb_resources[1].name = pdev->resource[1].name; + musb_resources[1].start = pdev->resource[1].start; + musb_resources[1].end = pdev->resource[1].end; + musb_resources[1].flags = pdev->resource[1].flags; + + ret = platform_device_add_resources(musb, musb_resources, + ARRAY_SIZE(musb_resources)); + if (ret) { + dev_err(&pdev->dev, "failed to add resources\n"); + goto err2; + } + + ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); + if (ret) { + dev_err(&pdev->dev, "failed to add platform_data\n"); + goto err2; + } + + ret = platform_device_add(musb); + if (ret) { + dev_err(&pdev->dev, "failed to register musb device\n"); + goto err2; + } + + return 0; + +err2: + clk_disable_unprepare(clk); + +err1: + platform_device_put(musb); + +err0: + return ret; +} + +static int ux500_remove(struct platform_device *pdev) +{ + struct ux500_glue *glue = platform_get_drvdata(pdev); + + platform_device_unregister(glue->musb); + clk_disable_unprepare(glue->clk); + + return 0; +} + +#ifdef CONFIG_PM +static int ux500_suspend(struct device *dev) +{ + struct ux500_glue *glue = dev_get_drvdata(dev); + struct musb *musb = glue_to_musb(glue); + + usb_phy_set_suspend(musb->xceiv, 1); + clk_disable_unprepare(glue->clk); + + return 0; +} + +static int ux500_resume(struct device *dev) +{ + struct ux500_glue *glue = dev_get_drvdata(dev); + struct musb *musb = glue_to_musb(glue); + int ret; + + ret = clk_prepare_enable(glue->clk); + if (ret) { + dev_err(dev, "failed to enable clock\n"); + return ret; + } + + usb_phy_set_suspend(musb->xceiv, 0); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume); + +static const struct of_device_id ux500_match[] = { + { .compatible = "stericsson,db8500-musb", }, + {} +}; + +static struct platform_driver ux500_driver = { + .probe = ux500_probe, + .remove = ux500_remove, + .driver = { + .name = "musb-ux500", + .pm = &ux500_pm_ops, + .of_match_table = ux500_match, + }, +}; + +MODULE_DESCRIPTION("UX500 MUSB Glue Layer"); +MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>"); +MODULE_LICENSE("GPL v2"); +module_platform_driver(ux500_driver); |