356 lines
8.3 KiB
C
356 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020, Broadcom */
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/of.h>
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#include <linux/kernel.h>
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#include <linux/kdebug.h>
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#include <linux/gpio/consumer.h>
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struct out_pin {
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u32 enable_mask;
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u32 value_mask;
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u32 changed_mask;
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u32 clr_changed_mask;
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struct gpio_desc *gpiod;
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const char *name;
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};
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struct in_pin {
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u32 enable_mask;
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u32 value_mask;
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struct gpio_desc *gpiod;
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const char *name;
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struct brcmstb_usb_pinmap_data *pdata;
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};
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struct brcmstb_usb_pinmap_data {
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void __iomem *regs;
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int in_count;
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struct in_pin *in_pins;
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int out_count;
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struct out_pin *out_pins;
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};
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static void pinmap_set(void __iomem *reg, u32 mask)
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{
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u32 val;
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val = readl(reg);
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val |= mask;
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writel(val, reg);
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}
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static void pinmap_unset(void __iomem *reg, u32 mask)
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{
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u32 val;
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val = readl(reg);
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val &= ~mask;
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writel(val, reg);
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}
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static void sync_in_pin(struct in_pin *pin)
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{
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u32 val;
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val = gpiod_get_value(pin->gpiod);
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if (val)
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pinmap_set(pin->pdata->regs, pin->value_mask);
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else
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pinmap_unset(pin->pdata->regs, pin->value_mask);
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}
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/*
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* Interrupt from override register, propagate from override bit
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* to GPIO.
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*/
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static irqreturn_t brcmstb_usb_pinmap_ovr_isr(int irq, void *dev_id)
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{
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struct brcmstb_usb_pinmap_data *pdata = dev_id;
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struct out_pin *pout;
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u32 val;
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u32 bit;
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int x;
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pr_debug("%s: reg: 0x%x\n", __func__, readl(pdata->regs));
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pout = pdata->out_pins;
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for (x = 0; x < pdata->out_count; x++) {
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val = readl(pdata->regs);
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if (val & pout->changed_mask) {
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pinmap_set(pdata->regs, pout->clr_changed_mask);
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pinmap_unset(pdata->regs, pout->clr_changed_mask);
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bit = val & pout->value_mask;
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gpiod_set_value(pout->gpiod, bit ? 1 : 0);
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pr_debug("%s: %s bit changed state to %d\n",
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__func__, pout->name, bit ? 1 : 0);
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}
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}
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return IRQ_HANDLED;
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}
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/*
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* Interrupt from GPIO, propagate from GPIO to override bit.
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*/
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static irqreturn_t brcmstb_usb_pinmap_gpio_isr(int irq, void *dev_id)
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{
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struct in_pin *pin = dev_id;
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pr_debug("%s: %s pin changed state\n", __func__, pin->name);
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sync_in_pin(pin);
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return IRQ_HANDLED;
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}
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static void get_pin_counts(struct device_node *dn, int *in_count,
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int *out_count)
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{
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int in;
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int out;
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*in_count = 0;
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*out_count = 0;
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in = of_property_count_strings(dn, "brcm,in-functions");
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if (in < 0)
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return;
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out = of_property_count_strings(dn, "brcm,out-functions");
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if (out < 0)
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return;
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*in_count = in;
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*out_count = out;
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}
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static int parse_pins(struct device *dev, struct device_node *dn,
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struct brcmstb_usb_pinmap_data *pdata)
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{
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struct out_pin *pout;
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struct in_pin *pin;
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int index;
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int res;
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int x;
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pin = pdata->in_pins;
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for (x = 0, index = 0; x < pdata->in_count; x++) {
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pin->gpiod = devm_gpiod_get_index(dev, "in", x, GPIOD_IN);
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if (IS_ERR(pin->gpiod)) {
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dev_err(dev, "Error getting gpio %s\n", pin->name);
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return PTR_ERR(pin->gpiod);
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}
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res = of_property_read_string_index(dn, "brcm,in-functions", x,
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&pin->name);
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if (res < 0) {
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dev_err(dev, "Error getting brcm,in-functions for %s\n",
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pin->name);
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return res;
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}
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res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
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&pin->enable_mask);
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if (res < 0) {
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dev_err(dev, "Error getting 1st brcm,in-masks for %s\n",
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pin->name);
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return res;
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}
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res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
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&pin->value_mask);
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if (res < 0) {
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dev_err(dev, "Error getting 2nd brcm,in-masks for %s\n",
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pin->name);
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return res;
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}
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pin->pdata = pdata;
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pin++;
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}
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pout = pdata->out_pins;
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for (x = 0, index = 0; x < pdata->out_count; x++) {
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pout->gpiod = devm_gpiod_get_index(dev, "out", x,
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GPIOD_OUT_HIGH);
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if (IS_ERR(pout->gpiod)) {
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dev_err(dev, "Error getting gpio %s\n", pin->name);
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return PTR_ERR(pout->gpiod);
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}
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res = of_property_read_string_index(dn, "brcm,out-functions", x,
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&pout->name);
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if (res < 0) {
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dev_err(dev, "Error getting brcm,out-functions for %s\n",
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pout->name);
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return res;
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}
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res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
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&pout->enable_mask);
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if (res < 0) {
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dev_err(dev, "Error getting 1st brcm,out-masks for %s\n",
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pout->name);
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return res;
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}
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res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
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&pout->value_mask);
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if (res < 0) {
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dev_err(dev, "Error getting 2nd brcm,out-masks for %s\n",
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pout->name);
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return res;
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}
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res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
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&pout->changed_mask);
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if (res < 0) {
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dev_err(dev, "Error getting 3rd brcm,out-masks for %s\n",
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pout->name);
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return res;
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}
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res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
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&pout->clr_changed_mask);
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if (res < 0) {
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dev_err(dev, "Error getting 4th out-masks for %s\n",
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pout->name);
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return res;
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}
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pout++;
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}
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return 0;
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}
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static void sync_all_pins(struct brcmstb_usb_pinmap_data *pdata)
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{
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struct out_pin *pout;
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struct in_pin *pin;
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int val;
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int x;
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/*
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* Enable the override, clear any changed condition and
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* propagate the state to the GPIO for all out pins.
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*/
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pout = pdata->out_pins;
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for (x = 0; x < pdata->out_count; x++) {
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pinmap_set(pdata->regs, pout->enable_mask);
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pinmap_set(pdata->regs, pout->clr_changed_mask);
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pinmap_unset(pdata->regs, pout->clr_changed_mask);
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val = readl(pdata->regs) & pout->value_mask;
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gpiod_set_value(pout->gpiod, val ? 1 : 0);
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pout++;
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}
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/* sync and enable all in pins. */
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pin = pdata->in_pins;
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for (x = 0; x < pdata->in_count; x++) {
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sync_in_pin(pin);
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pinmap_set(pdata->regs, pin->enable_mask);
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pin++;
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}
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}
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static int __init brcmstb_usb_pinmap_probe(struct platform_device *pdev)
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{
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struct device_node *dn = pdev->dev.of_node;
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struct brcmstb_usb_pinmap_data *pdata;
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struct in_pin *pin;
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struct resource *r;
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int out_count;
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int in_count;
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int err;
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int irq;
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int x;
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get_pin_counts(dn, &in_count, &out_count);
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if ((in_count + out_count) == 0)
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return -EINVAL;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r)
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return -EINVAL;
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pdata = devm_kzalloc(&pdev->dev,
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sizeof(*pdata) +
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(sizeof(struct in_pin) * in_count) +
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(sizeof(struct out_pin) * out_count), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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pdata->in_count = in_count;
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pdata->out_count = out_count;
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pdata->in_pins = (struct in_pin *)(pdata + 1);
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pdata->out_pins = (struct out_pin *)(pdata->in_pins + in_count);
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pdata->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
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if (!pdata->regs)
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return -ENOMEM;
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platform_set_drvdata(pdev, pdata);
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err = parse_pins(&pdev->dev, dn, pdata);
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if (err)
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return err;
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sync_all_pins(pdata);
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if (out_count) {
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/* Enable interrupt for out pins */
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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err = devm_request_irq(&pdev->dev, irq,
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brcmstb_usb_pinmap_ovr_isr,
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IRQF_TRIGGER_RISING,
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pdev->name, pdata);
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if (err < 0) {
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dev_err(&pdev->dev, "Error requesting IRQ\n");
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return err;
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}
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}
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for (x = 0, pin = pdata->in_pins; x < pdata->in_count; x++, pin++) {
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irq = gpiod_to_irq(pin->gpiod);
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if (irq < 0) {
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dev_err(&pdev->dev, "Error getting IRQ for %s pin\n",
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pin->name);
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return irq;
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}
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err = devm_request_irq(&pdev->dev, irq,
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brcmstb_usb_pinmap_gpio_isr,
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IRQF_SHARED | IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING,
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pdev->name, pin);
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if (err < 0) {
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dev_err(&pdev->dev, "Error requesting IRQ for %s pin\n",
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pin->name);
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return err;
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}
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}
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dev_dbg(&pdev->dev, "Driver probe succeeded\n");
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dev_dbg(&pdev->dev, "In pin count: %d, out pin count: %d\n",
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pdata->in_count, pdata->out_count);
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return 0;
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}
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static const struct of_device_id brcmstb_usb_pinmap_of_match[] = {
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{ .compatible = "brcm,usb-pinmap" },
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{ },
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};
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static struct platform_driver brcmstb_usb_pinmap_driver = {
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.driver = {
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.name = "brcm-usb-pinmap",
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.of_match_table = brcmstb_usb_pinmap_of_match,
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},
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};
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static int __init brcmstb_usb_pinmap_init(void)
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{
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return platform_driver_probe(&brcmstb_usb_pinmap_driver,
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brcmstb_usb_pinmap_probe);
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}
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module_init(brcmstb_usb_pinmap_init);
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MODULE_AUTHOR("Al Cooper <alcooperx@gmail.com>");
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MODULE_DESCRIPTION("Broadcom USB Pinmap Driver");
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MODULE_LICENSE("GPL");
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