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Mon, 17 Oct 2016 07:12:03 +0000 From: Yoshihiro Shimoda To: CC: , , Yoshihiro Shimoda Subject: [PATCH] phy: rcar-gen3-usb2: add sysfs for usb role swap Date: Mon, 17 Oct 2016 16:10:48 +0900 Message-ID: <1476688248-983-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Originating-IP: [211.11.155.144] X-ClientProxiedBy: OS2PR01CA0067.jpnprd01.prod.outlook.com (10.165.51.155) To SIXPR06MB0560.apcprd06.prod.outlook.com (10.160.238.153) X-MS-Office365-Filtering-Correlation-Id: 3e583766-f961-414f-f08d-08d3f65ce5d8 X-Microsoft-Exchange-Diagnostics: 1; SIXPR06MB0560; 2:DwHR6+/S5Uy32QfAx4kLufowf4kCL9ZiIzMSXi27tRTY8yzH6ieJ5oR6sew9VFR8dFlrwXhXwrK30cuQ4+7+XiTzKwRKWxWie4v9vmpaJJ4SSQoKFQnfQtlw/C2oaepYRSyGLW3mcZie28ZwZV0CRkobxRMEnNnfrPQtRlLXWcGSQGGdOkqK7AIaqpfgaghFMM1PnES4jgIlyYG7ae7V8g==; 3:WDaBttnPj/UZ5MihJnOgzLSxG2d480XoHh6hFq5MeaD92IOA/x9aKVaLVd1GoG4kbRd4vOYb4XGMtfjq3eYIAJ/OnU6GfmB3xg9UPygzQkvVZNa8Aug1tKIxywdL7YyaG2Rc7xnoCqFDceXczm0k/A==; 25:1eypWcgbLRDiOYGRhFaHHdhaBvhcvWIKdei52q7FHsUDU6SnEV4j854cvjX/jJYc0oZ7cDBQyC6b4IDczNBpZ45D1zkeS8JHG8q8P4iwZ+WD2UKn493hWGcCKNSha4u0lrd4OH+1JtQWsZBL/WsxuLNCX/eQMaXN5gBVEPhrzsj9KwX/oOi/eERvZuf8zeW/6frrC8xBrRYXgikYFzXJIGxYCvtN5/v8nDny3YIc+IjFnY2mC+/1xZJYxnA+mzEYtxnxwEX1MnIKUKCXZrO3OGMoMbqqhrDWMw9vbwuJ+Fpi3M2Zw5qBSawx1WM7v83k1ChqQaDSqxLaPJy31lmepIdhKyYdmTKDejSshbsFNPRoE3F3SmD4wyqPaOKmR9tKNVk3WA3aZ59B9Dlh4546UdWcWmgTnqz8iXexO7N+gO6f0QfLlXYF71EHqbYzQMAG X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:SIXPR06MB0560; 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20:PQgKAa/G9eCasP38sVXsFTg2Q349ow/tlbhS3GHvIrX0s6+pDso+6WoRf9c2w0Pyp1ZIFap0L6Bj/ew+GeBpr5a4bj7Ux91JSedFM/eoT26jery3N86XtKCbvepp7R7I92pefLUSlkPM+VMEUh6StfUbjCGuXER/394iTfm4OZ8= X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2016 07:12:03.7371 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: SIXPR06MB0560 Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds sysfs "otg_inputs" for usb role swap. This parameter is write-only and if you use them 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 (as host), you input the following command: # echo a_bus_req/ > /sys/devices/platform/soc/ee080200.usb-phy/otg_inputs 3) On B-device (as peripheral), you input the following command: # echo b_bus_req > /sys/devices/platform/soc/ee080200.usb-phy/otg_inputs Then, the A-device acts as a peripheral (A-peripheral) and the B-device acts as a host (B-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 condition keeps "A-peripheral".) # echo a_bus_drop > /sys/devices/platform/soc/ee080200.usb-phy/otg_inputs Also you can use the following command if you want the B-device board to act as a peripheral again. # echo b_bus_req/ > /sys/devices/platform/soc/ee080200.usb-phy/otg_inputs Signed-off-by: Yoshihiro Shimoda --- This patch is based on the linux-phy.git / phy-for-4.9-resolved_v3 tag. (commit id = c4b0bf82f705747ed7de90c5736b07248cbb29cd) .../ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 | 11 ++ drivers/phy/phy-rcar-gen3-usb2.c | 124 ++++++++++++++++++++- 2 files changed, 134 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 diff --git a/Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 b/Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 new file mode 100644 index 0000000..c7e715af --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 @@ -0,0 +1,11 @@ +What: /sys/devices/platform//otg-inputs +Date: October 2016 +KernelVersion: 4.10 +Contact: Yoshihiro Shimoda +Description: + This write-only file changes the phy mode for role swap of usb. + This file accepts the following strings: + "a_bus_req/" - switching from A-Host to A-Peripheral + "a_bus_drop" - switching from A-Peripheral to A-Host + "b_bus_req" - switching from B-Peripheral to B-Host + "b_bus_req/" - switching from B-Host to B-Peripheral diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c index 3d97ead..80f5bcc 100644 --- a/drivers/phy/phy-rcar-gen3-usb2.c +++ b/drivers/phy/phy-rcar-gen3-usb2.c @@ -70,6 +70,7 @@ #define USB2_LINECTRL1_DP_RPD BIT(18) #define USB2_LINECTRL1_DMRPD_EN BIT(17) #define USB2_LINECTRL1_DM_RPD BIT(16) +#define USB2_LINECTRL1_OPMODE_NODRV BIT(6) /* ADPCTRL */ #define USB2_ADPCTRL_OTGSESSVLD BIT(20) @@ -161,6 +162,43 @@ static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch) schedule_work(&ch->work); } +static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch) +{ + void __iomem *usb2_base = ch->base; + u32 val; + + val = readl(usb2_base + USB2_LINECTRL1); + writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1); + + rcar_gen3_set_linectrl(ch, 1, 1); + rcar_gen3_set_host_mode(ch, 1); + rcar_gen3_enable_vbus_ctrl(ch, 0); + + val = readl(usb2_base + USB2_LINECTRL1); + writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1); +} + +static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch) +{ + rcar_gen3_set_linectrl(ch, 0, 1); + rcar_gen3_set_host_mode(ch, 0); + rcar_gen3_enable_vbus_ctrl(ch, 1); +} + +static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch) +{ + void __iomem *usb2_base = ch->base; + u32 val; + + val = readl(usb2_base + USB2_OBINTEN); + writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN); + + rcar_gen3_enable_vbus_ctrl(ch, 0); + rcar_gen3_init_for_host(ch); + + writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN); +} + static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch) { return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG); @@ -174,6 +212,71 @@ static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch) rcar_gen3_init_for_peri(ch); } +/* + * The following table is a state transition for usb phy mode: + * State Event Next state + * disconnected: E1 a_host + * E2 b_peripheral + * A-Device - a_host: E2 b_peripheral + * E3 disconnected + * E4 a_suspend + * A-Device - a_suspend: E2 b_peripheral + * E3 disconnected + * E5 a_host + * E6 a_peripheral + * A-Device - a_peripheral: E2 b_peripheral + * E3 disconnected + * E5 a_host + * B-Device - b_peripheral: E3 disconnected + * E7 b_wait_acon + * B-Device - b_wait_acon E3 disconnected + * E8 b_host + * B-Device - b_host: E3 disconnected + * E9 b_peripheral + * Events: + * E1: ID = 0 && Host detects D+ pull up, E2: ID = 1 && VBUS = 1 + * E3: VBUS = 0 || ID is changed, E4: a_bus_req/ + * E5: a_bus_drop, E6: Turns D+ pull up off + * E7: b_bus_req, E8: Detects D+ pull up + * E9: b_bus_req/ + */ +static ssize_t otg_inputs_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct rcar_gen3_chan *ch = dev_get_drvdata(dev); + bool is_host, is_b_device; + + if (!ch->has_otg || !ch->phy->init_count) + return -EIO; + + is_b_device = rcar_gen3_check_id(ch); /* true = B-Device */ + is_host = !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI); + + if (!strncmp(buf, "a_bus_req/", strlen("a_bus_req/"))) { + if (is_b_device) /* fail if B-device */ + return -ENODEV; + rcar_gen3_init_for_a_peri(ch); + } else if (!strncmp(buf, "a_bus_drop", strlen("a_bus_drop"))) { + if (is_b_device || is_host) /* fail if B-device or A-host */ + return -ENODEV; + rcar_gen3_init_from_a_peri_to_a_host(ch); + } else if (!strncmp(buf, "b_bus_req/", strlen("b_bus_req/"))) { + if (!is_b_device || !is_host) /* fail if A-device or B-peri */ + return -ENODEV; + rcar_gen3_init_for_peri(ch); + } else if (!strncmp(buf, "b_bus_req", strlen("b_bus_req"))) { + if (!is_b_device) /* fail if A-device */ + return -ENODEV; + rcar_gen3_init_for_b_host(ch); + } else { + return -EINVAL; + } + + return count; +} +static DEVICE_ATTR_WO(otg_inputs); + static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch) { void __iomem *usb2_base = ch->base; @@ -351,21 +454,40 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev) 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)) + 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_otg_inputs); + 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_otg_inputs); + + 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);