diff options
Diffstat (limited to 'drivers/usb/musb/mediatek.c')
| -rw-r--r-- | drivers/usb/musb/mediatek.c | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c new file mode 100644 index 000000000000..6b88c2f5d970 --- /dev/null +++ b/drivers/usb/musb/mediatek.c @@ -0,0 +1,582 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 MediaTek Inc. + * + * Author: + * Min Guo <min.guo@mediatek.com> + * Yonglong Wu <yonglong.wu@mediatek.com> + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/usb/role.h> +#include <linux/usb/usb_phy_generic.h> +#include "musb_core.h" +#include "musb_dma.h" + +#define USB_L1INTS 0x00a0 +#define USB_L1INTM 0x00a4 +#define MTK_MUSB_TXFUNCADDR 0x0480 + +/* MediaTek controller toggle enable and status reg */ +#define MUSB_RXTOG 0x80 +#define MUSB_RXTOGEN 0x82 +#define MUSB_TXTOG 0x84 +#define MUSB_TXTOGEN 0x86 +#define MTK_TOGGLE_EN GENMASK(15, 0) + +#define TX_INT_STATUS BIT(0) +#define RX_INT_STATUS BIT(1) +#define USBCOM_INT_STATUS BIT(2) +#define DMA_INT_STATUS BIT(3) + +#define DMA_INTR_STATUS_MSK GENMASK(7, 0) +#define DMA_INTR_UNMASK_SET_MSK GENMASK(31, 24) + +struct mtk_glue { + struct device *dev; + struct musb *musb; + struct platform_device *musb_pdev; + struct platform_device *usb_phy; + struct phy *phy; + struct usb_phy *xceiv; + enum phy_mode phy_mode; + struct clk *main; + struct clk *mcu; + struct clk *univpll; + enum usb_role role; + struct usb_role_switch *role_sw; +}; + +static int mtk_musb_clks_get(struct mtk_glue *glue) +{ + struct device *dev = glue->dev; + + glue->main = devm_clk_get(dev, "main"); + if (IS_ERR(glue->main)) { + dev_err(dev, "fail to get main clock\n"); + return PTR_ERR(glue->main); + } + + glue->mcu = devm_clk_get(dev, "mcu"); + if (IS_ERR(glue->mcu)) { + dev_err(dev, "fail to get mcu clock\n"); + return PTR_ERR(glue->mcu); + } + + glue->univpll = devm_clk_get(dev, "univpll"); + if (IS_ERR(glue->univpll)) { + dev_err(dev, "fail to get univpll clock\n"); + return PTR_ERR(glue->univpll); + } + + return 0; +} + +static int mtk_musb_clks_enable(struct mtk_glue *glue) +{ + int ret; + + ret = clk_prepare_enable(glue->main); + if (ret) { + dev_err(glue->dev, "failed to enable main clock\n"); + goto err_main_clk; + } + + ret = clk_prepare_enable(glue->mcu); + if (ret) { + dev_err(glue->dev, "failed to enable mcu clock\n"); + goto err_mcu_clk; + } + + ret = clk_prepare_enable(glue->univpll); + if (ret) { + dev_err(glue->dev, "failed to enable univpll clock\n"); + goto err_univpll_clk; + } + + return 0; + +err_univpll_clk: + clk_disable_unprepare(glue->mcu); +err_mcu_clk: + clk_disable_unprepare(glue->main); +err_main_clk: + return ret; +} + +static void mtk_musb_clks_disable(struct mtk_glue *glue) +{ + clk_disable_unprepare(glue->univpll); + clk_disable_unprepare(glue->mcu); + clk_disable_unprepare(glue->main); +} + +static int musb_usb_role_sx_set(struct device *dev, enum usb_role role) +{ + struct mtk_glue *glue = dev_get_drvdata(dev); + struct musb *musb = glue->musb; + u8 devctl = readb(musb->mregs + MUSB_DEVCTL); + enum usb_role new_role; + + if (role == glue->role) + return 0; + + switch (role) { + case USB_ROLE_HOST: + musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; + glue->phy_mode = PHY_MODE_USB_HOST; + new_role = USB_ROLE_HOST; + if (glue->role == USB_ROLE_NONE) + phy_power_on(glue->phy); + + devctl |= MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + MUSB_HST_MODE(musb); + break; + case USB_ROLE_DEVICE: + musb->xceiv->otg->state = OTG_STATE_B_IDLE; + glue->phy_mode = PHY_MODE_USB_DEVICE; + new_role = USB_ROLE_DEVICE; + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + if (glue->role == USB_ROLE_NONE) + phy_power_on(glue->phy); + + MUSB_DEV_MODE(musb); + break; + case USB_ROLE_NONE: + glue->phy_mode = PHY_MODE_USB_OTG; + new_role = USB_ROLE_NONE; + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + if (glue->role != USB_ROLE_NONE) + phy_power_off(glue->phy); + + break; + default: + dev_err(glue->dev, "Invalid State\n"); + return -EINVAL; + } + + glue->role = new_role; + phy_set_mode(glue->phy, glue->phy_mode); + + return 0; +} + +static enum usb_role musb_usb_role_sx_get(struct device *dev) +{ + struct mtk_glue *glue = dev_get_drvdata(dev); + + return glue->role; +} + +static int mtk_otg_switch_init(struct mtk_glue *glue) +{ + struct usb_role_switch_desc role_sx_desc = { 0 }; + + role_sx_desc.set = musb_usb_role_sx_set; + role_sx_desc.get = musb_usb_role_sx_get; + role_sx_desc.fwnode = dev_fwnode(glue->dev); + glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc); + + return PTR_ERR_OR_ZERO(glue->role_sw); +} + +static void mtk_otg_switch_exit(struct mtk_glue *glue) +{ + return usb_role_switch_unregister(glue->role_sw); +} + +static irqreturn_t generic_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_clearb(musb->mregs, MUSB_INTRUSB); + musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX); + musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX); + + if (musb->int_usb || musb->int_tx || musb->int_rx) + retval = musb_interrupt(musb); + + spin_unlock_irqrestore(&musb->lock, flags); + + return retval; +} + +static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id) +{ + irqreturn_t retval = IRQ_NONE; + struct musb *musb = (struct musb *)dev_id; + u32 l1_ints; + + l1_ints = musb_readl(musb->mregs, USB_L1INTS) & + musb_readl(musb->mregs, USB_L1INTM); + + if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS)) + retval = generic_interrupt(irq, musb); + +#if defined(CONFIG_USB_INVENTRA_DMA) + if (l1_ints & DMA_INT_STATUS) + retval = dma_controller_irq(irq, musb->dma_controller); +#endif + return retval; +} + +static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset) +{ + return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum; +} + +static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset) +{ + u8 data; + + /* W1C */ + data = musb_readb(addr, offset); + musb_writeb(addr, offset, data); + return data; +} + +static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset) +{ + u16 data; + + /* W1C */ + data = musb_readw(addr, offset); + musb_writew(addr, offset, data); + return data; +} + +static int mtk_musb_set_mode(struct musb *musb, u8 mode) +{ + struct device *dev = musb->controller; + struct mtk_glue *glue = dev_get_drvdata(dev->parent); + enum phy_mode new_mode; + enum usb_role new_role; + + switch (mode) { + case MUSB_HOST: + new_mode = PHY_MODE_USB_HOST; + new_role = USB_ROLE_HOST; + break; + case MUSB_PERIPHERAL: + new_mode = PHY_MODE_USB_DEVICE; + new_role = USB_ROLE_DEVICE; + break; + case MUSB_OTG: + new_mode = PHY_MODE_USB_OTG; + new_role = USB_ROLE_NONE; + break; + default: + dev_err(glue->dev, "Invalid mode request\n"); + return -EINVAL; + } + + if (glue->phy_mode == new_mode) + return 0; + + if (musb->port_mode != MUSB_OTG) { + dev_err(glue->dev, "Does not support changing modes\n"); + return -EINVAL; + } + + glue->role = new_role; + musb_usb_role_sx_set(dev, glue->role); + return 0; +} + +static int mtk_musb_init(struct musb *musb) +{ + struct device *dev = musb->controller; + struct mtk_glue *glue = dev_get_drvdata(dev->parent); + int ret; + + glue->musb = musb; + musb->phy = glue->phy; + musb->xceiv = glue->xceiv; + musb->is_host = false; + musb->isr = mtk_musb_interrupt; + + /* Set TX/RX toggle enable */ + musb_writew(musb->mregs, MUSB_TXTOGEN, MTK_TOGGLE_EN); + musb_writew(musb->mregs, MUSB_RXTOGEN, MTK_TOGGLE_EN); + + if (musb->port_mode == MUSB_OTG) { + ret = mtk_otg_switch_init(glue); + if (ret) + return ret; + } + + ret = phy_init(glue->phy); + if (ret) + goto err_phy_init; + + ret = phy_power_on(glue->phy); + if (ret) + goto err_phy_power_on; + + phy_set_mode(glue->phy, glue->phy_mode); + +#if defined(CONFIG_USB_INVENTRA_DMA) + musb_writel(musb->mregs, MUSB_HSDMA_INTR, + DMA_INTR_STATUS_MSK | DMA_INTR_UNMASK_SET_MSK); +#endif + musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS | + USBCOM_INT_STATUS | DMA_INT_STATUS); + return 0; + +err_phy_power_on: + phy_exit(glue->phy); +err_phy_init: + mtk_otg_switch_exit(glue); + return ret; +} + +static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out) +{ + struct musb *musb = qh->hw_ep->musb; + u8 epnum = qh->hw_ep->epnum; + u16 toggle; + + toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG); + return toggle & (1 << epnum); +} + +static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb) +{ + struct musb *musb = qh->hw_ep->musb; + u8 epnum = qh->hw_ep->epnum; + u16 value, toggle; + + toggle = usb_gettoggle(urb->dev, qh->epnum, is_out); + + if (is_out) { + value = musb_readw(musb->mregs, MUSB_TXTOG); + value |= toggle << epnum; + musb_writew(musb->mregs, MUSB_TXTOG, value); + } else { + value = musb_readw(musb->mregs, MUSB_RXTOG); + value |= toggle << epnum; + musb_writew(musb->mregs, MUSB_RXTOG, value); + } + + return 0; +} + +static int mtk_musb_exit(struct musb *musb) +{ + struct device *dev = musb->controller; + struct mtk_glue *glue = dev_get_drvdata(dev->parent); + + mtk_otg_switch_exit(glue); + phy_power_off(glue->phy); + phy_exit(glue->phy); + mtk_musb_clks_disable(glue); + + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + return 0; +} + +static const struct musb_platform_ops mtk_musb_ops = { + .quirks = MUSB_DMA_INVENTRA, + .init = mtk_musb_init, + .get_toggle = mtk_musb_get_toggle, + .set_toggle = mtk_musb_set_toggle, + .exit = mtk_musb_exit, +#ifdef CONFIG_USB_INVENTRA_DMA + .dma_init = musbhs_dma_controller_create_noirq, + .dma_exit = musbhs_dma_controller_destroy, +#endif + .clearb = mtk_musb_clearb, + .clearw = mtk_musb_clearw, + .busctl_offset = mtk_musb_busctl_offset, + .set_mode = mtk_musb_set_mode, +}; + +#define MTK_MUSB_MAX_EP_NUM 8 +#define MTK_MUSB_RAM_BITS 11 + +static struct musb_fifo_cfg mtk_musb_mode_cfg[] = { + { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, }, + { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, }, + { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, }, +}; + +static const struct musb_hdrc_config mtk_musb_hdrc_config = { + .fifo_cfg = mtk_musb_mode_cfg, + .fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg), + .multipoint = true, + .dyn_fifo = true, + .num_eps = MTK_MUSB_MAX_EP_NUM, + .ram_bits = MTK_MUSB_RAM_BITS, +}; + +static const struct platform_device_info mtk_dev_info = { + .name = "musb-hdrc", + .id = PLATFORM_DEVID_AUTO, + .dma_mask = DMA_BIT_MASK(32), +}; + +static int mtk_musb_probe(struct platform_device *pdev) +{ + struct musb_hdrc_platform_data *pdata; + struct mtk_glue *glue; + struct platform_device_info pinfo; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + int ret = -ENOMEM; + + glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL); + if (!glue) + return -ENOMEM; + + glue->dev = dev; + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + ret = of_platform_populate(np, NULL, NULL, dev); + if (ret) { + dev_err(dev, "failed to create child devices at %p\n", np); + return ret; + } + + ret = mtk_musb_clks_get(glue); + if (ret) + return ret; + + pdata->config = &mtk_musb_hdrc_config; + pdata->platform_ops = &mtk_musb_ops; + pdata->mode = usb_get_dr_mode(dev); + + if (IS_ENABLED(CONFIG_USB_MUSB_HOST)) + pdata->mode = USB_DR_MODE_HOST; + else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET)) + pdata->mode = USB_DR_MODE_PERIPHERAL; + + switch (pdata->mode) { + case USB_DR_MODE_HOST: + glue->phy_mode = PHY_MODE_USB_HOST; + glue->role = USB_ROLE_HOST; + break; + case USB_DR_MODE_PERIPHERAL: + glue->phy_mode = PHY_MODE_USB_DEVICE; + glue->role = USB_ROLE_DEVICE; + break; + case USB_DR_MODE_OTG: + glue->phy_mode = PHY_MODE_USB_OTG; + glue->role = USB_ROLE_NONE; + break; + default: + dev_err(&pdev->dev, "Error 'dr_mode' property\n"); + return -EINVAL; + } + + glue->phy = devm_of_phy_get_by_index(dev, np, 0); + if (IS_ERR(glue->phy)) { + dev_err(dev, "fail to getting phy %ld\n", + PTR_ERR(glue->phy)); + return PTR_ERR(glue->phy); + } + + glue->usb_phy = usb_phy_generic_register(); + if (IS_ERR(glue->usb_phy)) { + dev_err(dev, "fail to registering usb-phy %ld\n", + PTR_ERR(glue->usb_phy)); + return PTR_ERR(glue->usb_phy); + } + + glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); + if (IS_ERR(glue->xceiv)) { + dev_err(dev, "fail to getting usb-phy %d\n", ret); + ret = PTR_ERR(glue->xceiv); + goto err_unregister_usb_phy; + } + + 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 <min.guo@mediatek.com>"); +MODULE_LICENSE("GPL v2"); |