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![Yoshihiro Shimoda](/assets/img/avatar_default.png)
This patch adds sysfs "role" for usb role swap. This parameter can be read and write. If you use this file as the following, you can swap the usb role. For example: 1) Connect a usb cable using 2 Salvator-x boards 2) On A-Device (ID pin is low), you input the following command: # echo peripheral > /sys/devices/platform/soc/ee080200.usb-phy/role 3) On B-Device (ID pin is high), you input the following command: # echo host > /sys/devices/platform/soc/ee080200.usb-phy/role Then, the A-device acts as a peripheral and the B-device acts as a host. Please note that A-Device must input the following command if you want the board to act as a host again. (even if you disconnect the usb cable, since id state may be the same, the A-Device keeps to act as peripheral.) # echo host > /sys/devices/platform/soc/ee080200.usb-phy/role Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Reviewed-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
490 lines
13 KiB
C
490 lines
13 KiB
C
/*
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* Renesas R-Car Gen3 for USB2.0 PHY driver
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*
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* Copyright (C) 2015 Renesas Electronics Corporation
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*
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* This is based on the phy-rcar-gen2 driver:
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* Copyright (C) 2014 Renesas Solutions Corp.
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* Copyright (C) 2014 Cogent Embedded, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/extcon.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/workqueue.h>
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/******* USB2.0 Host registers (original offset is +0x200) *******/
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#define USB2_INT_ENABLE 0x000
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#define USB2_USBCTR 0x00c
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#define USB2_SPD_RSM_TIMSET 0x10c
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#define USB2_OC_TIMSET 0x110
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#define USB2_COMMCTRL 0x600
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#define USB2_OBINTSTA 0x604
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#define USB2_OBINTEN 0x608
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#define USB2_VBCTRL 0x60c
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#define USB2_LINECTRL1 0x610
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#define USB2_ADPCTRL 0x630
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/* INT_ENABLE */
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#define USB2_INT_ENABLE_UCOM_INTEN BIT(3)
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#define USB2_INT_ENABLE_USBH_INTB_EN BIT(2)
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#define USB2_INT_ENABLE_USBH_INTA_EN BIT(1)
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#define USB2_INT_ENABLE_INIT (USB2_INT_ENABLE_UCOM_INTEN | \
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USB2_INT_ENABLE_USBH_INTB_EN | \
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USB2_INT_ENABLE_USBH_INTA_EN)
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/* USBCTR */
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#define USB2_USBCTR_DIRPD BIT(2)
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#define USB2_USBCTR_PLL_RST BIT(1)
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/* SPD_RSM_TIMSET */
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#define USB2_SPD_RSM_TIMSET_INIT 0x014e029b
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/* OC_TIMSET */
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#define USB2_OC_TIMSET_INIT 0x000209ab
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/* COMMCTRL */
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#define USB2_COMMCTRL_OTG_PERI BIT(31) /* 1 = Peripheral mode */
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/* OBINTSTA and OBINTEN */
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#define USB2_OBINT_SESSVLDCHG BIT(12)
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#define USB2_OBINT_IDDIGCHG BIT(11)
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#define USB2_OBINT_BITS (USB2_OBINT_SESSVLDCHG | \
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USB2_OBINT_IDDIGCHG)
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/* VBCTRL */
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#define USB2_VBCTRL_DRVVBUSSEL BIT(8)
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/* LINECTRL1 */
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#define USB2_LINECTRL1_DPRPD_EN BIT(19)
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#define USB2_LINECTRL1_DP_RPD BIT(18)
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#define USB2_LINECTRL1_DMRPD_EN BIT(17)
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#define USB2_LINECTRL1_DM_RPD BIT(16)
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#define USB2_LINECTRL1_OPMODE_NODRV BIT(6)
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/* ADPCTRL */
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#define USB2_ADPCTRL_OTGSESSVLD BIT(20)
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#define USB2_ADPCTRL_IDDIG BIT(19)
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#define USB2_ADPCTRL_IDPULLUP BIT(5) /* 1 = ID sampling is enabled */
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#define USB2_ADPCTRL_DRVVBUS BIT(4)
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struct rcar_gen3_chan {
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void __iomem *base;
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struct extcon_dev *extcon;
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struct phy *phy;
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struct regulator *vbus;
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struct work_struct work;
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bool extcon_host;
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bool has_otg;
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};
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static void rcar_gen3_phy_usb2_work(struct work_struct *work)
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{
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struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
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work);
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if (ch->extcon_host) {
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extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, true);
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extcon_set_cable_state_(ch->extcon, EXTCON_USB, false);
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} else {
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extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, false);
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extcon_set_cable_state_(ch->extcon, EXTCON_USB, true);
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}
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}
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static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
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{
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void __iomem *usb2_base = ch->base;
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u32 val = readl(usb2_base + USB2_COMMCTRL);
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dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, host);
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if (host)
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val &= ~USB2_COMMCTRL_OTG_PERI;
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else
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val |= USB2_COMMCTRL_OTG_PERI;
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writel(val, usb2_base + USB2_COMMCTRL);
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}
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static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
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{
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void __iomem *usb2_base = ch->base;
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u32 val = readl(usb2_base + USB2_LINECTRL1);
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dev_vdbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
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val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
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if (dp)
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val |= USB2_LINECTRL1_DP_RPD;
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if (dm)
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val |= USB2_LINECTRL1_DM_RPD;
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writel(val, usb2_base + USB2_LINECTRL1);
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}
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static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
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{
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void __iomem *usb2_base = ch->base;
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u32 val = readl(usb2_base + USB2_ADPCTRL);
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dev_vdbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, val, vbus);
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if (vbus)
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val |= USB2_ADPCTRL_DRVVBUS;
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else
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val &= ~USB2_ADPCTRL_DRVVBUS;
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writel(val, usb2_base + USB2_ADPCTRL);
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}
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static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
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{
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rcar_gen3_set_linectrl(ch, 1, 1);
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rcar_gen3_set_host_mode(ch, 1);
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rcar_gen3_enable_vbus_ctrl(ch, 1);
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ch->extcon_host = true;
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schedule_work(&ch->work);
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}
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static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
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{
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rcar_gen3_set_linectrl(ch, 0, 1);
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rcar_gen3_set_host_mode(ch, 0);
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rcar_gen3_enable_vbus_ctrl(ch, 0);
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ch->extcon_host = false;
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schedule_work(&ch->work);
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}
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static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
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{
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void __iomem *usb2_base = ch->base;
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u32 val;
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val = readl(usb2_base + USB2_LINECTRL1);
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writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
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rcar_gen3_set_linectrl(ch, 1, 1);
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rcar_gen3_set_host_mode(ch, 1);
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rcar_gen3_enable_vbus_ctrl(ch, 0);
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val = readl(usb2_base + USB2_LINECTRL1);
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writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
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}
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static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
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{
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rcar_gen3_set_linectrl(ch, 0, 1);
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rcar_gen3_set_host_mode(ch, 0);
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rcar_gen3_enable_vbus_ctrl(ch, 1);
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}
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static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
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{
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void __iomem *usb2_base = ch->base;
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u32 val;
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val = readl(usb2_base + USB2_OBINTEN);
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writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
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rcar_gen3_enable_vbus_ctrl(ch, 0);
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rcar_gen3_init_for_host(ch);
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writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
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}
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static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
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{
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return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
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}
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static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
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{
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if (!rcar_gen3_check_id(ch))
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rcar_gen3_init_for_host(ch);
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else
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rcar_gen3_init_for_peri(ch);
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}
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static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
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{
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return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
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}
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static ssize_t role_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
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bool is_b_device, is_host, new_mode_is_host;
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if (!ch->has_otg || !ch->phy->init_count)
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return -EIO;
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/*
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* is_b_device: true is B-Device. false is A-Device.
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* If {new_mode_}is_host: true is Host mode. false is Peripheral mode.
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*/
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is_b_device = rcar_gen3_check_id(ch);
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is_host = rcar_gen3_is_host(ch);
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if (!strncmp(buf, "host", strlen("host")))
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new_mode_is_host = true;
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else if (!strncmp(buf, "peripheral", strlen("peripheral")))
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new_mode_is_host = false;
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else
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return -EINVAL;
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/* If current and new mode is the same, this returns the error */
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if (is_host == new_mode_is_host)
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return -EINVAL;
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if (new_mode_is_host) { /* And is_host must be false */
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if (!is_b_device) /* A-Peripheral */
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rcar_gen3_init_from_a_peri_to_a_host(ch);
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else /* B-Peripheral */
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rcar_gen3_init_for_b_host(ch);
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} else { /* And is_host must be true */
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if (!is_b_device) /* A-Host */
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rcar_gen3_init_for_a_peri(ch);
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else /* B-Host */
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rcar_gen3_init_for_peri(ch);
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}
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return count;
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}
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static ssize_t role_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
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if (!ch->has_otg || !ch->phy->init_count)
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return -EIO;
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return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
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"peripheral");
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}
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static DEVICE_ATTR_RW(role);
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static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
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{
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void __iomem *usb2_base = ch->base;
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u32 val;
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val = readl(usb2_base + USB2_VBCTRL);
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writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
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writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
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val = readl(usb2_base + USB2_OBINTEN);
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writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
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val = readl(usb2_base + USB2_ADPCTRL);
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writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
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val = readl(usb2_base + USB2_LINECTRL1);
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rcar_gen3_set_linectrl(ch, 0, 0);
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writel(val | USB2_LINECTRL1_DPRPD_EN | USB2_LINECTRL1_DMRPD_EN,
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usb2_base + USB2_LINECTRL1);
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rcar_gen3_device_recognition(ch);
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}
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static int rcar_gen3_phy_usb2_init(struct phy *p)
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{
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struct rcar_gen3_chan *channel = phy_get_drvdata(p);
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void __iomem *usb2_base = channel->base;
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/* Initialize USB2 part */
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writel(USB2_INT_ENABLE_INIT, usb2_base + USB2_INT_ENABLE);
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writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
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writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
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/* Initialize otg part */
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if (channel->has_otg)
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rcar_gen3_init_otg(channel);
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return 0;
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}
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static int rcar_gen3_phy_usb2_exit(struct phy *p)
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{
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struct rcar_gen3_chan *channel = phy_get_drvdata(p);
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writel(0, channel->base + USB2_INT_ENABLE);
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return 0;
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}
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static int rcar_gen3_phy_usb2_power_on(struct phy *p)
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{
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struct rcar_gen3_chan *channel = phy_get_drvdata(p);
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void __iomem *usb2_base = channel->base;
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u32 val;
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int ret;
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if (channel->vbus) {
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ret = regulator_enable(channel->vbus);
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if (ret)
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return ret;
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}
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val = readl(usb2_base + USB2_USBCTR);
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val |= USB2_USBCTR_PLL_RST;
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writel(val, usb2_base + USB2_USBCTR);
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val &= ~USB2_USBCTR_PLL_RST;
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writel(val, usb2_base + USB2_USBCTR);
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return 0;
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}
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static int rcar_gen3_phy_usb2_power_off(struct phy *p)
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{
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struct rcar_gen3_chan *channel = phy_get_drvdata(p);
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int ret = 0;
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if (channel->vbus)
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ret = regulator_disable(channel->vbus);
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return ret;
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}
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static struct phy_ops rcar_gen3_phy_usb2_ops = {
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.init = rcar_gen3_phy_usb2_init,
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.exit = rcar_gen3_phy_usb2_exit,
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.power_on = rcar_gen3_phy_usb2_power_on,
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.power_off = rcar_gen3_phy_usb2_power_off,
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.owner = THIS_MODULE,
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};
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static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
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{
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struct rcar_gen3_chan *ch = _ch;
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void __iomem *usb2_base = ch->base;
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u32 status = readl(usb2_base + USB2_OBINTSTA);
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irqreturn_t ret = IRQ_NONE;
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if (status & USB2_OBINT_BITS) {
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dev_vdbg(&ch->phy->dev, "%s: %08x\n", __func__, status);
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writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
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rcar_gen3_device_recognition(ch);
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ret = IRQ_HANDLED;
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}
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return ret;
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}
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static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
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{ .compatible = "renesas,usb2-phy-r8a7795" },
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{ .compatible = "renesas,usb2-phy-r8a7796" },
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{ .compatible = "renesas,rcar-gen3-usb2-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
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static const unsigned int rcar_gen3_phy_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rcar_gen3_chan *channel;
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struct phy_provider *provider;
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struct resource *res;
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int irq;
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if (!dev->of_node) {
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dev_err(dev, "This driver needs device tree\n");
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return -EINVAL;
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}
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channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
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if (!channel)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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channel->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(channel->base))
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return PTR_ERR(channel->base);
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/* call request_irq for OTG */
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irq = platform_get_irq(pdev, 0);
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if (irq >= 0) {
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int ret;
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INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
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irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
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IRQF_SHARED, dev_name(dev), channel);
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if (irq < 0)
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dev_err(dev, "No irq handler (%d)\n", irq);
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channel->has_otg = true;
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channel->extcon = devm_extcon_dev_allocate(dev,
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rcar_gen3_phy_cable);
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if (IS_ERR(channel->extcon))
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return PTR_ERR(channel->extcon);
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ret = devm_extcon_dev_register(dev, channel->extcon);
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if (ret < 0) {
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dev_err(dev, "Failed to register extcon\n");
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return ret;
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}
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}
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/* devm_phy_create() will call pm_runtime_enable(dev); */
|
|
channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
|
|
if (IS_ERR(channel->phy)) {
|
|
dev_err(dev, "Failed to create USB2 PHY\n");
|
|
return PTR_ERR(channel->phy);
|
|
}
|
|
|
|
channel->vbus = devm_regulator_get_optional(dev, "vbus");
|
|
if (IS_ERR(channel->vbus)) {
|
|
if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
|
|
return PTR_ERR(channel->vbus);
|
|
channel->vbus = NULL;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, channel);
|
|
phy_set_drvdata(channel->phy, channel);
|
|
|
|
provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
if (IS_ERR(provider)) {
|
|
dev_err(dev, "Failed to register PHY provider\n");
|
|
} else if (channel->has_otg) {
|
|
int ret;
|
|
|
|
ret = device_create_file(dev, &dev_attr_role);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return PTR_ERR_OR_ZERO(provider);
|
|
}
|
|
|
|
static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
|
|
{
|
|
struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
|
|
|
|
if (channel->has_otg)
|
|
device_remove_file(&pdev->dev, &dev_attr_role);
|
|
|
|
return 0;
|
|
};
|
|
|
|
static struct platform_driver rcar_gen3_phy_usb2_driver = {
|
|
.driver = {
|
|
.name = "phy_rcar_gen3_usb2",
|
|
.of_match_table = rcar_gen3_phy_usb2_match_table,
|
|
},
|
|
.probe = rcar_gen3_phy_usb2_probe,
|
|
.remove = rcar_gen3_phy_usb2_remove,
|
|
};
|
|
module_platform_driver(rcar_gen3_phy_usb2_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
|
|
MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
|