--- /dev/null
+// 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;
+}
+
+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 <alcooperx@gmail.com>");
+MODULE_DESCRIPTION("Broadcom USB Pinmap Driver");
+MODULE_LICENSE("GPL");
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