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https://github.com/hardkernel/linux.git
synced 2026-06-11 05:17:10 +09:00
usb: add OTG driver for tegra USB PHY
Change-Id: I23be62e819b658c0e25f70eebfbb8dc0dc76c173 Signed-off-by: Gary King <gking@nvidia.com>
This commit is contained in:
Gary King
@@ -67,4 +67,12 @@ config NOP_USB_XCEIV
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built-in with usb ip or which are autonomous and doesn't require any
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phy programming such as ISP1x04 etc.
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config USB_TEGRA_OTG
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boolean "Tegra OTG Driver"
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depends on USB && ARCH_TEGRA
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select USB_OTG_UTILS
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help
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Enable this driver on boards which use the internal VBUS and ID
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sensing of the Tegra USB PHY.
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endif # USB || OTG
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@@ -7,6 +7,7 @@ obj-$(CONFIG_USB_OTG_UTILS) += otg.o
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# transceiver drivers
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obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
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obj-$(CONFIG_USB_TEGRA_OTG) += tegra-otg.o
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obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
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obj-$(CONFIG_TWL4030_USB) += twl4030-usb.o
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obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
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393
drivers/usb/otg/tegra-otg.c
Normal file
393
drivers/usb/otg/tegra-otg.c
Normal file
@@ -0,0 +1,393 @@
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/*
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* drivers/usb/otg/tegra-otg.c
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*
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* OTG transceiver driver for Tegra UTMI phy
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*
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* Copyright (C) 2010 NVIDIA Corp.
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* Copyright (C) 2010 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/usb.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/hcd.h>
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#include <linux/platform_device.h>
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#include <linux/tegra_usb.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#define USB_PHY_WAKEUP 0x408
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#define USB_ID_INT_EN (1 << 0)
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#define USB_ID_INT_STATUS (1 << 1)
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#define USB_ID_STATUS (1 << 2)
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#define USB_ID_PIN_WAKEUP_EN (1 << 6)
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#define USB_VBUS_WAKEUP_EN (1 << 30)
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#define USB_VBUS_INT_EN (1 << 8)
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#define USB_VBUS_INT_STATUS (1 << 9)
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#define USB_VBUS_STATUS (1 << 10)
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#define USB_INTS (USB_VBUS_INT_STATUS | USB_ID_INT_STATUS)
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struct tegra_otg_data {
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struct otg_transceiver otg;
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unsigned long int_status;
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spinlock_t lock;
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void __iomem *regs;
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struct clk *clk;
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int irq;
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struct platform_device *host;
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struct platform_device *pdev;
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};
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static inline unsigned long otg_readl(struct tegra_otg_data *tegra,
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unsigned int offset)
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{
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return readl(tegra->regs + offset);
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}
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static inline void otg_writel(struct tegra_otg_data *tegra, unsigned long val,
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unsigned int offset)
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{
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writel(val, tegra->regs + offset);
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}
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static const char *tegra_state_name(enum usb_otg_state state)
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{
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if (state == OTG_STATE_A_HOST)
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return "HOST";
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if (state == OTG_STATE_B_PERIPHERAL)
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return "PERIPHERAL";
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if (state == OTG_STATE_A_SUSPEND)
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return "SUSPEND";
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return "INVALID";
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}
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void tegra_start_host(struct tegra_otg_data *tegra)
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{
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int retval;
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struct platform_device *pdev;
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struct platform_device *host = tegra->host;
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void *platform_data;
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pdev = platform_device_alloc(host->name, host->id);
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if (!pdev)
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return;
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if (host->resource) {
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retval = platform_device_add_resources(pdev, host->resource,
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host->num_resources);
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if (retval)
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goto error;
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}
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pdev->dev.dma_mask = host->dev.dma_mask;
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pdev->dev.coherent_dma_mask = host->dev.coherent_dma_mask;
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platform_data = kmalloc(sizeof(struct tegra_ehci_platform_data), GFP_KERNEL);
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if (!platform_data)
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goto error;
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memcpy(platform_data, host->dev.platform_data,
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sizeof(struct tegra_ehci_platform_data));
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pdev->dev.platform_data = platform_data;
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retval = platform_device_add(pdev);
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if (retval)
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goto error_add;
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tegra->pdev = pdev;
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return;
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error_add:
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kfree(platform_data);
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error:
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pr_err("%s: failed to add the host contoller device\n", __func__);
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platform_device_put(pdev);
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}
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void tegra_stop_host(struct tegra_otg_data *tegra)
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{
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if (tegra->pdev) {
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platform_device_unregister(tegra->pdev);
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tegra->pdev = NULL;
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}
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}
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static irqreturn_t tegra_otg_irq_thread(int irq, void *data)
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{
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struct tegra_otg_data *tegra = data;
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struct otg_transceiver *otg = &tegra->otg;
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enum usb_otg_state from = otg->state;
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enum usb_otg_state to = OTG_STATE_UNDEFINED;
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unsigned long flags;
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unsigned long status;
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clk_enable(tegra->clk);
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status = otg_readl(tegra, USB_PHY_WAKEUP);
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spin_lock_irqsave(&tegra->lock, flags);
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if (tegra->int_status & USB_ID_INT_STATUS) {
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if (status & USB_ID_STATUS)
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to = OTG_STATE_A_SUSPEND;
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else
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to = OTG_STATE_A_HOST;
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} else if (tegra->int_status & USB_VBUS_INT_STATUS) {
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if (status & USB_VBUS_STATUS)
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to = OTG_STATE_B_PERIPHERAL;
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else
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to = OTG_STATE_A_SUSPEND;
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}
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tegra->int_status = 0;
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spin_unlock_irqrestore(&tegra->lock, flags);
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otg->state = to;
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dev_info(tegra->otg.dev, "%s --> %s", tegra_state_name(from),
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tegra_state_name(to));
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if (to == OTG_STATE_A_SUSPEND) {
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if (from == OTG_STATE_A_HOST && tegra->host)
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tegra_stop_host(tegra);
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else if (from == OTG_STATE_B_PERIPHERAL && otg->gadget)
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usb_gadget_vbus_disconnect(otg->gadget);
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} else if (to == OTG_STATE_B_PERIPHERAL && otg->gadget) {
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if (from == OTG_STATE_A_SUSPEND)
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usb_gadget_vbus_connect(otg->gadget);
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} else if (to == OTG_STATE_A_HOST && tegra->host) {
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if (from == OTG_STATE_A_SUSPEND)
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tegra_start_host(tegra);
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}
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clk_disable(tegra->clk);
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return IRQ_HANDLED;
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}
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static irqreturn_t tegra_otg_irq(int irq, void *data)
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{
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struct tegra_otg_data *tegra = data;
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unsigned long val;
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clk_enable(tegra->clk);
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spin_lock(&tegra->lock);
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val = otg_readl(tegra, USB_PHY_WAKEUP);
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otg_writel(tegra, val, USB_PHY_WAKEUP);
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/* and the interrupt enables into the interrupt status bits */
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val = (val & (val << 1)) & USB_INTS;
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tegra->int_status |= val;
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spin_unlock(&tegra->lock);
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clk_disable(tegra->clk);
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return (val) ? IRQ_WAKE_THREAD : IRQ_NONE;
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}
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static int tegra_otg_set_peripheral(struct otg_transceiver *otg,
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struct usb_gadget *gadget)
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{
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struct tegra_otg_data *tegra;
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unsigned long val;
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tegra = container_of(otg, struct tegra_otg_data, otg);
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otg->gadget = gadget;
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clk_enable(tegra->clk);
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val = otg_readl(tegra, USB_PHY_WAKEUP);
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val &= ~(USB_VBUS_INT_STATUS | USB_ID_INT_STATUS);
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if (gadget)
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val |= (USB_VBUS_INT_EN | USB_VBUS_WAKEUP_EN);
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else
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val &= ~(USB_VBUS_INT_EN | USB_VBUS_WAKEUP_EN);
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otg_writel(tegra, val, USB_PHY_WAKEUP);
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clk_disable(tegra->clk);
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return 0;
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}
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static int tegra_otg_set_host(struct otg_transceiver *otg,
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struct usb_bus *host)
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{
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struct tegra_otg_data *tegra;
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unsigned long val;
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tegra = container_of(otg, struct tegra_otg_data, otg);
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otg->host = host;
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clk_enable(tegra->clk);
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val = otg_readl(tegra, USB_PHY_WAKEUP);
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val &= ~(USB_VBUS_INT_STATUS | USB_ID_INT_STATUS);
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if (host)
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val |= USB_ID_INT_EN | USB_ID_PIN_WAKEUP_EN;
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else
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val &= ~(USB_ID_INT_EN | USB_ID_PIN_WAKEUP_EN);
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otg_writel(tegra, val, USB_PHY_WAKEUP);
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clk_disable(tegra->clk);
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return 0;
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}
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static int tegra_otg_set_power(struct otg_transceiver *otg, unsigned mA)
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{
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return 0;
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}
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static int tegra_otg_set_suspend(struct otg_transceiver *otg, int suspend)
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{
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return 0;
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}
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static int tegra_otg_probe(struct platform_device *pdev)
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{
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struct tegra_otg_data *tegra;
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struct resource *res;
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unsigned long val;
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int err;
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tegra = kzalloc(sizeof(struct tegra_otg_data), GFP_KERNEL);
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if (!tegra)
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return -ENOMEM;
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tegra->otg.dev = &pdev->dev;
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tegra->otg.label = "tegra-otg";
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tegra->otg.state = OTG_STATE_UNDEFINED;
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tegra->otg.set_host = tegra_otg_set_host;
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tegra->otg.set_peripheral = tegra_otg_set_peripheral;
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tegra->otg.set_suspend = tegra_otg_set_suspend;
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tegra->otg.set_power = tegra_otg_set_power;
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tegra->host = pdev->dev.platform_data;
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spin_lock_init(&tegra->lock);
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platform_set_drvdata(pdev, tegra);
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tegra->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(tegra->clk)) {
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dev_err(&pdev->dev, "Can't get otg clock\n");
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err = PTR_ERR(tegra->clk);
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goto err_clk;
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}
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err = clk_enable(tegra->clk);
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if (err)
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goto err_clken;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get I/O memory\n");
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err = -ENXIO;
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goto err_io;
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}
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tegra->regs = ioremap(res->start, resource_size(res));
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if (!tegra->regs) {
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err = -ENOMEM;
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goto err_io;
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}
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val = otg_readl(tegra, USB_PHY_WAKEUP);
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val &= ~(USB_VBUS_INT_STATUS | USB_VBUS_INT_EN |
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USB_ID_INT_STATUS | USB_ID_INT_EN |
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USB_VBUS_WAKEUP_EN | USB_ID_PIN_WAKEUP_EN);
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otg_writel(tegra, val, USB_PHY_WAKEUP);
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tegra->otg.state = OTG_STATE_A_SUSPEND;
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err = otg_set_transceiver(&tegra->otg);
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if (err) {
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dev_err(&pdev->dev, "can't register transceiver (%d)\n", err);
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goto err_otg;
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}
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get IRQ\n");
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err = -ENXIO;
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goto err_irq;
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}
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tegra->irq = res->start;
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err = request_threaded_irq(tegra->irq, tegra_otg_irq,
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tegra_otg_irq_thread,
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IRQF_SHARED, "tegra-otg", tegra);
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if (err) {
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dev_err(&pdev->dev, "Failed to register IRQ\n");
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goto err_irq;
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}
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dev_info(&pdev->dev, "otg transceiver registered\n");
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return 0;
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err_irq:
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otg_set_transceiver(NULL);
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err_otg:
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iounmap(tegra->regs);
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err_io:
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clk_disable(tegra->clk);
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err_clken:
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clk_put(tegra->clk);
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err_clk:
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platform_set_drvdata(pdev, NULL);
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kfree(tegra);
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return err;
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}
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static int __exit tegra_otg_remove(struct platform_device *pdev)
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{
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struct tegra_otg_data *tegra = platform_get_drvdata(pdev);
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free_irq(tegra->irq, tegra);
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otg_set_transceiver(NULL);
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iounmap(tegra->regs);
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clk_disable(tegra->clk);
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clk_put(tegra->clk);
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platform_set_drvdata(pdev, NULL);
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kfree(tegra);
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return 0;
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}
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static struct platform_driver tegra_otg_driver = {
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.driver = {
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.name = "tegra-otg",
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},
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.remove = __exit_p(tegra_otg_remove),
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.probe = tegra_otg_probe,
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};
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static int __init tegra_otg_init(void)
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{
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return platform_driver_register(&tegra_otg_driver);
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}
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subsys_initcall(tegra_otg_init);
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static void __exit tegra_otg_exit(void)
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{
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platform_driver_unregister(&tegra_otg_driver);
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}
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module_exit(tegra_otg_exit);
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