From patchwork Mon Oct 12 20:00:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Cooper X-Patchwork-Id: 287558 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1B740C433E7 for ; Mon, 12 Oct 2020 20:00:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF41920878 for ; Mon, 12 Oct 2020 20:00:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="oqRkxjVK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388844AbgJLUAf (ORCPT ); Mon, 12 Oct 2020 16:00:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389184AbgJLUAa (ORCPT ); Mon, 12 Oct 2020 16:00:30 -0400 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5ADCC0613D1; Mon, 12 Oct 2020 13:00:29 -0700 (PDT) Received: by mail-pg1-x544.google.com with SMTP id i2so15413672pgh.7; Mon, 12 Oct 2020 13:00:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=u2H6gILGUQm7OVe0n2idlSQ4AwxzYcNZDK8v2U2RT6o=; b=oqRkxjVKqqCLoRxUtyx+hWxlhlLzZzvI45fxr/AidNl+iskbZ+ipGUZgvY3MqbHUFD zr9RwDlRRNFvKAFybySTJsluW+0cNaxJGpSfVcVKmhAXDU59gX9USOJOrNloBPTDUn23 QS5DIiHN1gSxmzxWUqT5/w5f55GxEAaQkidxqriirJPrxBGUZxXlY1vHRyE7CkrYLrsY YSO6Fa5DhFILuk3b5HLKALt4ISYbXfnLGRQoLpvOepQY/1riEElUk99vg8ggtTbk8q0O 9toThcjbEywU0EFF8s67dq2l3u7F56b07/Nbpeb+4sVG72ZDzsZ/NYw8zelasegwcEs5 WcSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=u2H6gILGUQm7OVe0n2idlSQ4AwxzYcNZDK8v2U2RT6o=; b=Xf/kiP5P+pRUfVE3Lk5gV0j4a7j0M6y+QFoYpikID+lGzrV+PysOkWTh7X8a581cJ/ tOPf00yl6Roy9ODkZMAvSBGJjvvSVB72bKgpoR9me3opP48VdfTmXHIYWdehW0a4Bx1S Z9Rot4gHvPMFlxZs+5tWuidaWaB1K7AWquKG0nfKCGogCOxS5Z2LgMeLaWycp+LHB4SZ KGwGmxyftRnq0hlB/cKHepSp6fe68kpXJmeKEtkTN4L+BkUHkFJkCGJexAO2fZyHfM2P pIuG99a5TxLj4RNADtPOPJgydlQCs/TQ0BIBBDeWFQKR1s0b1tByPsMQsDkcJtUU9QgC Pf6Q== X-Gm-Message-State: AOAM530YglO+PLPiaLVRSvn/XIRT87u9kGUFx8GeL2DqQgxcFuZB5vYV rl2BRe5Omec6+vcvCSpPMTTPpYFxQOI= X-Google-Smtp-Source: ABdhPJyRJGadwP6KzeUYiKB6VMx/zTSTyADwV7b+eYOe8TjbBOOtE7w4QOmbnIMatLTiOtlYiTqUEQ== X-Received: by 2002:a17:90b:3902:: with SMTP id ob2mr7185518pjb.178.1602532828775; Mon, 12 Oct 2020 13:00:28 -0700 (PDT) Received: from stbsrv-and-01.and.broadcom.net ([192.19.231.250]) by smtp.gmail.com with ESMTPSA id y124sm13556909pfy.28.2020.10.12.13.00.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2020 13:00:28 -0700 (PDT) From: Al Cooper To: linux-kernel@vger.kernel.org Cc: Al Cooper , bcm-kernel-feedback-list@broadcom.com, devicetree@vger.kernel.org, Florian Fainelli , Greg Kroah-Hartman , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, Rob Herring Subject: [PATCH v3 2/2] usb: Add driver to allow any GPIO to be used for 7211 USB signals Date: Mon, 12 Oct 2020 16:00:07 -0400 Message-Id: <20201012200007.8862-3-alcooperx@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201012200007.8862-1-alcooperx@gmail.com> References: <20201012200007.8862-1-alcooperx@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The Broadcom 7211 has new functionality that allows some USB low speed side band signals, that go from the XHCI host controller to pins on the chip, to be remapped to use any GPIO pin instead of the limited set selectable by hardware. This can be done without changing the standard driver for the host controller. There is currently support for three USB signals, PWRON, VBUS_PRESENT and PWRFLT. This driver will allow the remapping of any of these three signals based on settings in the Device Tree node for the driver. The driver was written so that it could handle additional signals added in the future by just adding the correct properties to the DT node. Below is an example of a DT node that would remap all three signals: usb_pinmap: usb-pinmap@22000d0 { compatible = "brcm,usb-pinmap"; reg = <0x22000d0 0x4>; in-gpios = <&gpio 18 0>, <&gpio 19 0>; brcm,in-functions = "VBUS", "PWRFLT"; brcm,in-masks = <0x8000 0x40000 0x10000 0x80000>; out-gpios = <&gpio 20 0>; brcm,out-functions = "PWRON"; brcm,out-masks = <0x20000 0x800000 0x400000 0x200000>; interrupts = <0x0 0xb2 0x4>; }; Signed-off-by: Al Cooper Reported-by: kernel test robot --- MAINTAINERS | 8 + drivers/usb/misc/Kconfig | 9 + drivers/usb/misc/Makefile | 1 + drivers/usb/misc/brcmstb-usb-pinmap.c | 351 ++++++++++++++++++++++++++ 4 files changed, 369 insertions(+) create mode 100644 drivers/usb/misc/brcmstb-usb-pinmap.c diff --git a/MAINTAINERS b/MAINTAINERS index cd2aea603e03..1198acd71534 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3567,6 +3567,14 @@ S: Maintained F: Documentation/devicetree/bindings/usb/brcm,bcm7445-ehci.yaml F: drivers/usb/host/ehci-brcm.* +BROADCOM BRCMSTB USB PIN MAP DRIVER +M: Al Cooper +L: linux-usb@vger.kernel.org +L: bcm-kernel-feedback-list@broadcom.com +S: Maintained +F: Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml +F: drivers/usb/misc/brcmstb-usb-pinmap.c + BROADCOM BRCMSTB USB2 and USB3 PHY DRIVER M: Al Cooper L: linux-kernel@vger.kernel.org diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index 6818ea689cd9..8f1144359012 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -275,3 +275,12 @@ config USB_CHAOSKEY To compile this driver as a module, choose M here: the module will be called chaoskey. + +config BRCM_USB_PINMAP + tristate "Broadcom pinmap driver support" + depends on (ARCH_BRCMSTB && PHY_BRCM_USB) || COMPILE_TEST + default ARCH_BRCMSTB && PHY_BRCM_USB + help + This option enables support for remapping some USB external + signals, which are typically on dedicated pins on the chip, + to any gpio. diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index da39bddb0604..5f4e598573ab 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -31,3 +31,4 @@ obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o +obj-$(CONFIG_BRCM_USB_PINMAP) += brcmstb-usb-pinmap.o diff --git a/drivers/usb/misc/brcmstb-usb-pinmap.c b/drivers/usb/misc/brcmstb-usb-pinmap.c new file mode 100644 index 000000000000..02144c39aaba --- /dev/null +++ b/drivers/usb/misc/brcmstb-usb-pinmap.c @@ -0,0 +1,351 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020, Broadcom */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct out_pin { + u32 enable_mask; + u32 value_mask; + u32 changed_mask; + u32 clr_changed_mask; + struct gpio_desc *gpiod; + const char *name; +}; + +struct in_pin { + u32 enable_mask; + u32 value_mask; + struct gpio_desc *gpiod; + const char *name; + struct brcmstb_usb_pinmap_data *pdata; +}; + +struct brcmstb_usb_pinmap_data { + void __iomem *regs; + int in_count; + struct in_pin *in_pins; + int out_count; + struct out_pin *out_pins; +}; + + +static void pinmap_set(void __iomem *reg, u32 mask) +{ + u32 val; + + val = readl(reg); + val |= mask; + writel(val, reg); +} + +static void pinmap_unset(void __iomem *reg, u32 mask) +{ + u32 val; + + val = readl(reg); + val &= ~mask; + writel(val, reg); +} + +static void sync_in_pin(struct in_pin *pin) +{ + u32 val; + + val = gpiod_get_value(pin->gpiod); + if (val) + pinmap_set(pin->pdata->regs, pin->value_mask); + else + pinmap_unset(pin->pdata->regs, pin->value_mask); +} + +/* + * Interrupt from override register, propagate from override bit + * to GPIO. + */ +static irqreturn_t brcmstb_usb_pinmap_ovr_isr(int irq, void *dev_id) +{ + struct brcmstb_usb_pinmap_data *pdata = dev_id; + struct out_pin *pout; + u32 val; + u32 bit; + int x; + + pr_debug("%s: reg: 0x%x\n", __func__, readl(pdata->regs)); + pout = pdata->out_pins; + for (x = 0; x < pdata->out_count; x++) { + val = readl(pdata->regs); + if (val & pout->changed_mask) { + pinmap_set(pdata->regs, pout->clr_changed_mask); + pinmap_unset(pdata->regs, pout->clr_changed_mask); + bit = val & pout->value_mask; + gpiod_set_value(pout->gpiod, bit ? 1 : 0); + pr_debug("%s: %s bit changed state to %d\n", + __func__, pout->name, bit ? 1 : 0); + } + } + return IRQ_HANDLED; +} + +/* + * Interrupt from GPIO, propagate from GPIO to override bit. + */ +static irqreturn_t brcmstb_usb_pinmap_gpio_isr(int irq, void *dev_id) +{ + struct in_pin *pin = dev_id; + + pr_debug("%s: %s pin changed state\n", __func__, pin->name); + sync_in_pin(pin); + return IRQ_HANDLED; +} + + +static void get_pin_counts(struct device_node *dn, int *in_count, + int *out_count) +{ + int in; + int out; + + *in_count = 0; + *out_count = 0; + in = of_property_count_strings(dn, "brcm,in-functions"); + if (in < 0) + return; + out = of_property_count_strings(dn, "brcm,out-functions"); + if (out < 0) + return; + *in_count = in; + *out_count = out; +} + +static int parse_pins(struct device *dev, struct device_node *dn, + struct brcmstb_usb_pinmap_data *pdata) +{ + struct out_pin *pout; + struct in_pin *pin; + int index; + int res; + int x; + + pin = pdata->in_pins; + for (x = 0, index = 0; x < pdata->in_count; x++) { + pin->gpiod = devm_gpiod_get_index(dev, "in", x, GPIOD_IN); + if (IS_ERR(pin->gpiod)) { + dev_err(dev, "Error getting gpio %s\n", pin->name); + return PTR_ERR(pin->gpiod); + + } + res = of_property_read_string_index(dn, "brcm,in-functions", x, + &pin->name); + if (res < 0) { + dev_err(dev, "Error getting brcm,in-functions for %s\n", + pin->name); + return res; + } + res = of_property_read_u32_index(dn, "brcm,in-masks", index++, + &pin->enable_mask); + if (res < 0) { + dev_err(dev, "Error getting 1st brcm,in-masks for %s\n", + pin->name); + return res; + } + res = of_property_read_u32_index(dn, "brcm,in-masks", index++, + &pin->value_mask); + if (res < 0) { + dev_err(dev, "Error getting 2nd brcm,in-masks for %s\n", + pin->name); + return res; + } + pin->pdata = pdata; + pin++; + } + pout = pdata->out_pins; + for (x = 0, index = 0; x < pdata->out_count; x++) { + pout->gpiod = devm_gpiod_get_index(dev, "out", x, + GPIOD_OUT_HIGH); + if (IS_ERR(pout->gpiod)) { + dev_err(dev, "Error getting gpio %s\n", pin->name); + return PTR_ERR(pout->gpiod); + } + res = of_property_read_string_index(dn, "brcm,out-functions", x, + &pout->name); + if (res < 0) { + dev_err(dev, "Error getting brcm,out-functions for %s\n", + pout->name); + return res; + } + res = of_property_read_u32_index(dn, "brcm,out-masks", index++, + &pout->enable_mask); + if (res < 0) { + dev_err(dev, "Error getting 1st brcm,out-masks for %s\n", + pout->name); + return res; + } + res = of_property_read_u32_index(dn, "brcm,out-masks", index++, + &pout->value_mask); + if (res < 0) { + dev_err(dev, "Error getting 2nd brcm,out-masks for %s\n", + pout->name); + return res; + } + res = of_property_read_u32_index(dn, "brcm,out-masks", index++, + &pout->changed_mask); + if (res < 0) { + dev_err(dev, "Error getting 3rd brcm,out-masks for %s\n", + pout->name); + return res; + } + res = of_property_read_u32_index(dn, "brcm,out-masks", index++, + &pout->clr_changed_mask); + if (res < 0) { + dev_err(dev, "Error getting 4th out-masks for %s\n", + pout->name); + return res; + } + pout++; + } + return 0; +} + +void sync_all_pins(struct brcmstb_usb_pinmap_data *pdata) +{ + struct out_pin *pout; + struct in_pin *pin; + int val; + int x; + + /* + * Enable the override, clear any changed condition and + * propagate the state to the GPIO for all out pins. + */ + pout = pdata->out_pins; + for (x = 0; x < pdata->out_count; x++) { + pinmap_set(pdata->regs, pout->enable_mask); + pinmap_set(pdata->regs, pout->clr_changed_mask); + pinmap_unset(pdata->regs, pout->clr_changed_mask); + val = readl(pdata->regs) & pout->value_mask; + gpiod_set_value(pout->gpiod, val ? 1 : 0); + pout++; + } + + /* sync and enable all in pins. */ + pin = pdata->in_pins; + for (x = 0; x < pdata->in_count; x++) { + sync_in_pin(pin); + pinmap_set(pdata->regs, pin->enable_mask); + pin++; + } +} + +static int __init brcmstb_usb_pinmap_probe(struct platform_device *pdev) +{ + struct device_node *dn = pdev->dev.of_node; + struct brcmstb_usb_pinmap_data *pdata; + struct in_pin *pin; + struct resource *r; + int out_count; + int in_count; + int err; + int irq; + int x; + + get_pin_counts(dn, &in_count, &out_count); + if ((in_count + out_count) == 0) + return -EINVAL; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + pdata = devm_kzalloc(&pdev->dev, + sizeof(*pdata) + + (sizeof(struct in_pin) * in_count) + + (sizeof(struct out_pin) * out_count), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + pdata->in_count = in_count; + pdata->out_count = out_count; + pdata->in_pins = (struct in_pin *)(pdata + 1); + pdata->out_pins = (struct out_pin *)(pdata->in_pins + in_count); + + pdata->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r)); + if (IS_ERR(pdata->regs)) + return PTR_ERR(pdata->regs); + platform_set_drvdata(pdev, pdata); + + err = parse_pins(&pdev->dev, dn, pdata); + if (err) + return err; + + sync_all_pins(pdata); + + if (out_count) { + + /* Enable interrupt for out pins */ + irq = platform_get_irq(pdev, 0); + err = devm_request_irq(&pdev->dev, irq, + brcmstb_usb_pinmap_ovr_isr, + IRQF_TRIGGER_RISING, + pdev->name, pdata); + if (err < 0) { + dev_err(&pdev->dev, "Error requesting IRQ\n"); + return err; + } + } + + for (x = 0, pin = pdata->in_pins; x < pdata->in_count; x++, pin++) { + irq = gpiod_to_irq(pin->gpiod); + if (irq < 0) { + dev_err(&pdev->dev, "Error getting IRQ for %s pin\n", + pin->name); + return irq; + } + err = devm_request_irq(&pdev->dev, irq, + brcmstb_usb_pinmap_gpio_isr, + IRQF_SHARED | IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING, + pdev->name, pin); + if (err < 0) { + dev_err(&pdev->dev, "Error requesting IRQ for %s pin\n", + pin->name); + return err; + } + } + + dev_dbg(&pdev->dev, "Driver probe succeeded\n"); + dev_dbg(&pdev->dev, "In pin count: %d, out pin count: %d\n", + pdata->in_count, pdata->out_count); + return 0; +} + + +static const struct of_device_id brcmstb_usb_pinmap_of_match[] = { + { .compatible = "brcm,usb-pinmap" }, + { }, +}; + +static struct platform_driver brcmstb_usb_pinmap_driver = { + .driver = { + .name = "brcm-usb-pinmap", + .of_match_table = brcmstb_usb_pinmap_of_match, + }, +}; + +static int __init brcmstb_usb_pinmap_init(void) +{ + return platform_driver_probe(&brcmstb_usb_pinmap_driver, + brcmstb_usb_pinmap_probe); +} + +module_init(brcmstb_usb_pinmap_init); +MODULE_AUTHOR("Al Cooper "); +MODULE_DESCRIPTION("Broadcom USB Pinmap Driver"); +MODULE_LICENSE("GPL");