diff --git a/MAINTAINERS b/MAINTAINERS index e73636b75f29..a6818b37704d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3572,6 +3572,14 @@ 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");