| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (c) 2020, Broadcom */ |
| |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/device.h> |
| #include <linux/of.h> |
| #include <linux/kernel.h> |
| #include <linux/kdebug.h> |
| #include <linux/gpio/consumer.h> |
| |
| 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; |
| } |
| |
| static 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); |
| if (!r) |
| return -EINVAL; |
| |
| 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 (!pdata->regs) |
| return -ENOMEM; |
| 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 <alcooperx@gmail.com>"); |
| MODULE_DESCRIPTION("Broadcom USB Pinmap Driver"); |
| MODULE_LICENSE("GPL"); |