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592 lines
14 KiB
592 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2019 MediaTek Inc. |
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* |
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* Author: |
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* Min Guo <[email protected]> |
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* Yonglong Wu <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/usb/role.h> |
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#include <linux/usb/usb_phy_generic.h> |
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#include "musb_core.h" |
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#include "musb_dma.h" |
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#define USB_L1INTS 0x00a0 |
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#define USB_L1INTM 0x00a4 |
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#define MTK_MUSB_TXFUNCADDR 0x0480 |
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/* MediaTek controller toggle enable and status reg */ |
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#define MUSB_RXTOG 0x80 |
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#define MUSB_RXTOGEN 0x82 |
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#define MUSB_TXTOG 0x84 |
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#define MUSB_TXTOGEN 0x86 |
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#define MTK_TOGGLE_EN GENMASK(15, 0) |
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#define TX_INT_STATUS BIT(0) |
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#define RX_INT_STATUS BIT(1) |
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#define USBCOM_INT_STATUS BIT(2) |
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#define DMA_INT_STATUS BIT(3) |
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#define DMA_INTR_STATUS_MSK GENMASK(7, 0) |
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#define DMA_INTR_UNMASK_SET_MSK GENMASK(31, 24) |
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struct mtk_glue { |
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struct device *dev; |
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struct musb *musb; |
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struct platform_device *musb_pdev; |
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struct platform_device *usb_phy; |
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struct phy *phy; |
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struct usb_phy *xceiv; |
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enum phy_mode phy_mode; |
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struct clk *main; |
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struct clk *mcu; |
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struct clk *univpll; |
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enum usb_role role; |
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struct usb_role_switch *role_sw; |
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}; |
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static int mtk_musb_clks_get(struct mtk_glue *glue) |
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{ |
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struct device *dev = glue->dev; |
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glue->main = devm_clk_get(dev, "main"); |
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if (IS_ERR(glue->main)) { |
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dev_err(dev, "fail to get main clock\n"); |
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return PTR_ERR(glue->main); |
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} |
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glue->mcu = devm_clk_get(dev, "mcu"); |
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if (IS_ERR(glue->mcu)) { |
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dev_err(dev, "fail to get mcu clock\n"); |
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return PTR_ERR(glue->mcu); |
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} |
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glue->univpll = devm_clk_get(dev, "univpll"); |
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if (IS_ERR(glue->univpll)) { |
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dev_err(dev, "fail to get univpll clock\n"); |
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return PTR_ERR(glue->univpll); |
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} |
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return 0; |
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} |
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static int mtk_musb_clks_enable(struct mtk_glue *glue) |
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{ |
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int ret; |
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ret = clk_prepare_enable(glue->main); |
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if (ret) { |
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dev_err(glue->dev, "failed to enable main clock\n"); |
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goto err_main_clk; |
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} |
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ret = clk_prepare_enable(glue->mcu); |
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if (ret) { |
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dev_err(glue->dev, "failed to enable mcu clock\n"); |
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goto err_mcu_clk; |
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} |
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ret = clk_prepare_enable(glue->univpll); |
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if (ret) { |
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dev_err(glue->dev, "failed to enable univpll clock\n"); |
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goto err_univpll_clk; |
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} |
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return 0; |
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err_univpll_clk: |
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clk_disable_unprepare(glue->mcu); |
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err_mcu_clk: |
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clk_disable_unprepare(glue->main); |
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err_main_clk: |
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return ret; |
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} |
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static void mtk_musb_clks_disable(struct mtk_glue *glue) |
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{ |
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clk_disable_unprepare(glue->univpll); |
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clk_disable_unprepare(glue->mcu); |
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clk_disable_unprepare(glue->main); |
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} |
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static int mtk_otg_switch_set(struct mtk_glue *glue, enum usb_role role) |
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{ |
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struct musb *musb = glue->musb; |
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u8 devctl = readb(musb->mregs + MUSB_DEVCTL); |
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enum usb_role new_role; |
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if (role == glue->role) |
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return 0; |
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switch (role) { |
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case USB_ROLE_HOST: |
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musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; |
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glue->phy_mode = PHY_MODE_USB_HOST; |
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new_role = USB_ROLE_HOST; |
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if (glue->role == USB_ROLE_NONE) |
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phy_power_on(glue->phy); |
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devctl |= MUSB_DEVCTL_SESSION; |
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); |
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MUSB_HST_MODE(musb); |
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break; |
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case USB_ROLE_DEVICE: |
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musb->xceiv->otg->state = OTG_STATE_B_IDLE; |
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glue->phy_mode = PHY_MODE_USB_DEVICE; |
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new_role = USB_ROLE_DEVICE; |
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devctl &= ~MUSB_DEVCTL_SESSION; |
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); |
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if (glue->role == USB_ROLE_NONE) |
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phy_power_on(glue->phy); |
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MUSB_DEV_MODE(musb); |
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break; |
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case USB_ROLE_NONE: |
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glue->phy_mode = PHY_MODE_USB_OTG; |
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new_role = USB_ROLE_NONE; |
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devctl &= ~MUSB_DEVCTL_SESSION; |
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musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); |
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if (glue->role != USB_ROLE_NONE) |
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phy_power_off(glue->phy); |
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break; |
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default: |
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dev_err(glue->dev, "Invalid State\n"); |
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return -EINVAL; |
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} |
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glue->role = new_role; |
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phy_set_mode(glue->phy, glue->phy_mode); |
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return 0; |
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} |
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static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role) |
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{ |
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return mtk_otg_switch_set(usb_role_switch_get_drvdata(sw), role); |
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} |
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static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw) |
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{ |
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struct mtk_glue *glue = usb_role_switch_get_drvdata(sw); |
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return glue->role; |
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} |
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static int mtk_otg_switch_init(struct mtk_glue *glue) |
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{ |
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struct usb_role_switch_desc role_sx_desc = { 0 }; |
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role_sx_desc.set = musb_usb_role_sx_set; |
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role_sx_desc.get = musb_usb_role_sx_get; |
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role_sx_desc.fwnode = dev_fwnode(glue->dev); |
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role_sx_desc.driver_data = glue; |
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glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc); |
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return PTR_ERR_OR_ZERO(glue->role_sw); |
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} |
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static void mtk_otg_switch_exit(struct mtk_glue *glue) |
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{ |
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return usb_role_switch_unregister(glue->role_sw); |
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} |
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static irqreturn_t generic_interrupt(int irq, void *__hci) |
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{ |
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unsigned long flags; |
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irqreturn_t retval = IRQ_NONE; |
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struct musb *musb = __hci; |
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spin_lock_irqsave(&musb->lock, flags); |
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musb->int_usb = musb_clearb(musb->mregs, MUSB_INTRUSB); |
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musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX); |
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musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX); |
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if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) { |
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/* ep0 FADDR must be 0 when (re)entering peripheral mode */ |
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musb_ep_select(musb->mregs, 0); |
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musb_writeb(musb->mregs, MUSB_FADDR, 0); |
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} |
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if (musb->int_usb || musb->int_tx || musb->int_rx) |
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retval = musb_interrupt(musb); |
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spin_unlock_irqrestore(&musb->lock, flags); |
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return retval; |
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} |
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static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id) |
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{ |
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irqreturn_t retval = IRQ_NONE; |
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struct musb *musb = (struct musb *)dev_id; |
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u32 l1_ints; |
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l1_ints = musb_readl(musb->mregs, USB_L1INTS) & |
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musb_readl(musb->mregs, USB_L1INTM); |
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if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS)) |
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retval = generic_interrupt(irq, musb); |
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#if defined(CONFIG_USB_INVENTRA_DMA) |
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if (l1_ints & DMA_INT_STATUS) |
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retval = dma_controller_irq(irq, musb->dma_controller); |
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#endif |
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return retval; |
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} |
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static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset) |
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{ |
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return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum; |
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} |
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static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset) |
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{ |
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u8 data; |
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/* W1C */ |
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data = musb_readb(addr, offset); |
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musb_writeb(addr, offset, data); |
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return data; |
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} |
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static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset) |
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{ |
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u16 data; |
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/* W1C */ |
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data = musb_readw(addr, offset); |
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musb_writew(addr, offset, data); |
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return data; |
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} |
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static int mtk_musb_set_mode(struct musb *musb, u8 mode) |
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{ |
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struct device *dev = musb->controller; |
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struct mtk_glue *glue = dev_get_drvdata(dev->parent); |
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enum phy_mode new_mode; |
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enum usb_role new_role; |
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switch (mode) { |
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case MUSB_HOST: |
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new_mode = PHY_MODE_USB_HOST; |
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new_role = USB_ROLE_HOST; |
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break; |
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case MUSB_PERIPHERAL: |
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new_mode = PHY_MODE_USB_DEVICE; |
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new_role = USB_ROLE_DEVICE; |
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break; |
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case MUSB_OTG: |
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new_mode = PHY_MODE_USB_OTG; |
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new_role = USB_ROLE_NONE; |
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break; |
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default: |
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dev_err(glue->dev, "Invalid mode request\n"); |
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return -EINVAL; |
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} |
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if (glue->phy_mode == new_mode) |
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return 0; |
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if (musb->port_mode != MUSB_OTG) { |
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dev_err(glue->dev, "Does not support changing modes\n"); |
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return -EINVAL; |
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} |
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mtk_otg_switch_set(glue, new_role); |
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return 0; |
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} |
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static int mtk_musb_init(struct musb *musb) |
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{ |
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struct device *dev = musb->controller; |
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struct mtk_glue *glue = dev_get_drvdata(dev->parent); |
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int ret; |
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glue->musb = musb; |
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musb->phy = glue->phy; |
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musb->xceiv = glue->xceiv; |
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musb->is_host = false; |
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musb->isr = mtk_musb_interrupt; |
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/* Set TX/RX toggle enable */ |
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musb_writew(musb->mregs, MUSB_TXTOGEN, MTK_TOGGLE_EN); |
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musb_writew(musb->mregs, MUSB_RXTOGEN, MTK_TOGGLE_EN); |
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if (musb->port_mode == MUSB_OTG) { |
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ret = mtk_otg_switch_init(glue); |
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if (ret) |
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return ret; |
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} |
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ret = phy_init(glue->phy); |
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if (ret) |
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goto err_phy_init; |
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ret = phy_power_on(glue->phy); |
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if (ret) |
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goto err_phy_power_on; |
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phy_set_mode(glue->phy, glue->phy_mode); |
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#if defined(CONFIG_USB_INVENTRA_DMA) |
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musb_writel(musb->mregs, MUSB_HSDMA_INTR, |
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DMA_INTR_STATUS_MSK | DMA_INTR_UNMASK_SET_MSK); |
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#endif |
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musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS | |
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USBCOM_INT_STATUS | DMA_INT_STATUS); |
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return 0; |
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err_phy_power_on: |
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phy_exit(glue->phy); |
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err_phy_init: |
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mtk_otg_switch_exit(glue); |
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return ret; |
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} |
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static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out) |
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{ |
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struct musb *musb = qh->hw_ep->musb; |
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u8 epnum = qh->hw_ep->epnum; |
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u16 toggle; |
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toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG); |
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return toggle & (1 << epnum); |
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} |
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static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb) |
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{ |
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struct musb *musb = qh->hw_ep->musb; |
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u8 epnum = qh->hw_ep->epnum; |
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u16 value, toggle; |
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toggle = usb_gettoggle(urb->dev, qh->epnum, is_out); |
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if (is_out) { |
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value = musb_readw(musb->mregs, MUSB_TXTOG); |
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value |= toggle << epnum; |
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musb_writew(musb->mregs, MUSB_TXTOG, value); |
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} else { |
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value = musb_readw(musb->mregs, MUSB_RXTOG); |
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value |= toggle << epnum; |
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musb_writew(musb->mregs, MUSB_RXTOG, value); |
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} |
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return 0; |
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} |
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static int mtk_musb_exit(struct musb *musb) |
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{ |
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struct device *dev = musb->controller; |
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struct mtk_glue *glue = dev_get_drvdata(dev->parent); |
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mtk_otg_switch_exit(glue); |
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phy_power_off(glue->phy); |
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phy_exit(glue->phy); |
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mtk_musb_clks_disable(glue); |
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pm_runtime_put_sync(dev); |
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pm_runtime_disable(dev); |
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return 0; |
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} |
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static const struct musb_platform_ops mtk_musb_ops = { |
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.quirks = MUSB_DMA_INVENTRA, |
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.init = mtk_musb_init, |
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.get_toggle = mtk_musb_get_toggle, |
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.set_toggle = mtk_musb_set_toggle, |
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.exit = mtk_musb_exit, |
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#ifdef CONFIG_USB_INVENTRA_DMA |
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.dma_init = musbhs_dma_controller_create_noirq, |
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.dma_exit = musbhs_dma_controller_destroy, |
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#endif |
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.clearb = mtk_musb_clearb, |
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.clearw = mtk_musb_clearw, |
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.busctl_offset = mtk_musb_busctl_offset, |
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.set_mode = mtk_musb_set_mode, |
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}; |
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#define MTK_MUSB_MAX_EP_NUM 8 |
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#define MTK_MUSB_RAM_BITS 11 |
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static struct musb_fifo_cfg mtk_musb_mode_cfg[] = { |
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{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, |
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{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, |
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{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, |
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{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, |
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{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, |
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{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, |
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{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, |
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{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, |
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{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, |
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{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, |
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{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, }, |
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{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, }, |
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{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, }, |
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{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, }, |
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}; |
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static const struct musb_hdrc_config mtk_musb_hdrc_config = { |
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.fifo_cfg = mtk_musb_mode_cfg, |
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.fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg), |
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.multipoint = true, |
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.dyn_fifo = true, |
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.num_eps = MTK_MUSB_MAX_EP_NUM, |
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.ram_bits = MTK_MUSB_RAM_BITS, |
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}; |
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static const struct platform_device_info mtk_dev_info = { |
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.name = "musb-hdrc", |
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.id = PLATFORM_DEVID_AUTO, |
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.dma_mask = DMA_BIT_MASK(32), |
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}; |
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static int mtk_musb_probe(struct platform_device *pdev) |
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{ |
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struct musb_hdrc_platform_data *pdata; |
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struct mtk_glue *glue; |
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struct platform_device_info pinfo; |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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int ret; |
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glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL); |
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if (!glue) |
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return -ENOMEM; |
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glue->dev = dev; |
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
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if (!pdata) |
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return -ENOMEM; |
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ret = of_platform_populate(np, NULL, NULL, dev); |
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if (ret) { |
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dev_err(dev, "failed to create child devices at %p\n", np); |
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return ret; |
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} |
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ret = mtk_musb_clks_get(glue); |
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if (ret) |
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return ret; |
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pdata->config = &mtk_musb_hdrc_config; |
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pdata->platform_ops = &mtk_musb_ops; |
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pdata->mode = usb_get_dr_mode(dev); |
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if (IS_ENABLED(CONFIG_USB_MUSB_HOST)) |
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pdata->mode = USB_DR_MODE_HOST; |
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else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET)) |
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pdata->mode = USB_DR_MODE_PERIPHERAL; |
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switch (pdata->mode) { |
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case USB_DR_MODE_HOST: |
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glue->phy_mode = PHY_MODE_USB_HOST; |
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glue->role = USB_ROLE_HOST; |
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break; |
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case USB_DR_MODE_PERIPHERAL: |
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glue->phy_mode = PHY_MODE_USB_DEVICE; |
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glue->role = USB_ROLE_DEVICE; |
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break; |
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case USB_DR_MODE_OTG: |
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glue->phy_mode = PHY_MODE_USB_OTG; |
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glue->role = USB_ROLE_NONE; |
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break; |
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default: |
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dev_err(&pdev->dev, "Error 'dr_mode' property\n"); |
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return -EINVAL; |
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} |
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glue->phy = devm_of_phy_get_by_index(dev, np, 0); |
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if (IS_ERR(glue->phy)) { |
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dev_err(dev, "fail to getting phy %ld\n", |
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PTR_ERR(glue->phy)); |
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return PTR_ERR(glue->phy); |
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} |
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glue->usb_phy = usb_phy_generic_register(); |
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if (IS_ERR(glue->usb_phy)) { |
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dev_err(dev, "fail to registering usb-phy %ld\n", |
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PTR_ERR(glue->usb_phy)); |
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return PTR_ERR(glue->usb_phy); |
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} |
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glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); |
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if (IS_ERR(glue->xceiv)) { |
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ret = PTR_ERR(glue->xceiv); |
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dev_err(dev, "fail to getting usb-phy %d\n", ret); |
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goto err_unregister_usb_phy; |
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} |
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|
|
platform_set_drvdata(pdev, glue); |
|
pm_runtime_enable(dev); |
|
pm_runtime_get_sync(dev); |
|
|
|
ret = mtk_musb_clks_enable(glue); |
|
if (ret) |
|
goto err_enable_clk; |
|
|
|
pinfo = mtk_dev_info; |
|
pinfo.parent = dev; |
|
pinfo.res = pdev->resource; |
|
pinfo.num_res = pdev->num_resources; |
|
pinfo.data = pdata; |
|
pinfo.size_data = sizeof(*pdata); |
|
|
|
glue->musb_pdev = platform_device_register_full(&pinfo); |
|
if (IS_ERR(glue->musb_pdev)) { |
|
ret = PTR_ERR(glue->musb_pdev); |
|
dev_err(dev, "failed to register musb device: %d\n", ret); |
|
goto err_device_register; |
|
} |
|
|
|
return 0; |
|
|
|
err_device_register: |
|
mtk_musb_clks_disable(glue); |
|
err_enable_clk: |
|
pm_runtime_put_sync(dev); |
|
pm_runtime_disable(dev); |
|
err_unregister_usb_phy: |
|
usb_phy_generic_unregister(glue->usb_phy); |
|
return ret; |
|
} |
|
|
|
static int mtk_musb_remove(struct platform_device *pdev) |
|
{ |
|
struct mtk_glue *glue = platform_get_drvdata(pdev); |
|
struct platform_device *usb_phy = glue->usb_phy; |
|
|
|
platform_device_unregister(glue->musb_pdev); |
|
usb_phy_generic_unregister(usb_phy); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id mtk_musb_match[] = { |
|
{.compatible = "mediatek,mtk-musb",}, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, mtk_musb_match); |
|
#endif |
|
|
|
static struct platform_driver mtk_musb_driver = { |
|
.probe = mtk_musb_probe, |
|
.remove = mtk_musb_remove, |
|
.driver = { |
|
.name = "musb-mtk", |
|
.of_match_table = of_match_ptr(mtk_musb_match), |
|
}, |
|
}; |
|
|
|
module_platform_driver(mtk_musb_driver); |
|
|
|
MODULE_DESCRIPTION("MediaTek MUSB Glue Layer"); |
|
MODULE_AUTHOR("Min Guo <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|