486 lines
12 KiB
C
486 lines
12 KiB
C
/*
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* Sonics Silicon Backplane
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* GPIO driver
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*
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* Copyright 2011, Broadcom Corporation
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* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/irqdomain.h>
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#include <linux/export.h>
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#include <linux/ssb/ssb.h>
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#include "ssb_private.h"
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/**************************************************
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* Shared
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**************************************************/
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static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip)
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{
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return container_of(chip, struct ssb_bus, gpio);
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}
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#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
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static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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if (bus->bustype == SSB_BUSTYPE_SSB)
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return irq_find_mapping(bus->irq_domain, gpio);
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else
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return -EINVAL;
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}
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#endif
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/**************************************************
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* ChipCommon
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**************************************************/
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static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
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}
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static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio,
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int value)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
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}
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static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
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unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
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return 0;
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}
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static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
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ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
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return 0;
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}
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static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
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/* clear pulldown */
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ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
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/* Set pullup */
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ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);
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return 0;
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}
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static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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/* clear pullup */
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ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
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}
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#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
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static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
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{
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struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
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int gpio = irqd_to_hwirq(d);
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ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
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}
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static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
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{
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struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
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int gpio = irqd_to_hwirq(d);
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u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));
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ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
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ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
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}
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static struct irq_chip ssb_gpio_irq_chipco_chip = {
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.name = "SSB-GPIO-CC",
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.irq_mask = ssb_gpio_irq_chipco_mask,
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.irq_unmask = ssb_gpio_irq_chipco_unmask,
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};
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static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
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{
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struct ssb_bus *bus = dev_id;
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struct ssb_chipcommon *chipco = &bus->chipco;
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u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
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u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
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u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
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unsigned long irqs = (val ^ pol) & mask;
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int gpio;
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if (!irqs)
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return IRQ_NONE;
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for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
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generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
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ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);
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return IRQ_HANDLED;
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}
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static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
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{
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struct ssb_chipcommon *chipco = &bus->chipco;
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struct gpio_chip *chip = &bus->gpio;
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int gpio, hwirq, err;
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if (bus->bustype != SSB_BUSTYPE_SSB)
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return 0;
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bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
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&irq_domain_simple_ops, chipco);
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if (!bus->irq_domain) {
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err = -ENODEV;
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goto err_irq_domain;
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}
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for (gpio = 0; gpio < chip->ngpio; gpio++) {
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int irq = irq_create_mapping(bus->irq_domain, gpio);
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irq_set_chip_data(irq, bus);
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irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
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handle_simple_irq);
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}
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hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
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err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
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"gpio", bus);
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if (err)
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goto err_req_irq;
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ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
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chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);
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return 0;
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err_req_irq:
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for (gpio = 0; gpio < chip->ngpio; gpio++) {
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int irq = irq_find_mapping(bus->irq_domain, gpio);
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irq_dispose_mapping(irq);
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}
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irq_domain_remove(bus->irq_domain);
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err_irq_domain:
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return err;
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}
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static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
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{
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struct ssb_chipcommon *chipco = &bus->chipco;
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struct gpio_chip *chip = &bus->gpio;
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int gpio;
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if (bus->bustype != SSB_BUSTYPE_SSB)
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return;
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chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
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free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
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for (gpio = 0; gpio < chip->ngpio; gpio++) {
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int irq = irq_find_mapping(bus->irq_domain, gpio);
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irq_dispose_mapping(irq);
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}
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irq_domain_remove(bus->irq_domain);
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}
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#else
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static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
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{
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return 0;
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}
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static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
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{
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}
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#endif
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static int ssb_gpio_chipco_init(struct ssb_bus *bus)
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{
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struct gpio_chip *chip = &bus->gpio;
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int err;
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chip->label = "ssb_chipco_gpio";
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chip->owner = THIS_MODULE;
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chip->request = ssb_gpio_chipco_request;
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chip->free = ssb_gpio_chipco_free;
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chip->get = ssb_gpio_chipco_get_value;
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chip->set = ssb_gpio_chipco_set_value;
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chip->direction_input = ssb_gpio_chipco_direction_input;
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chip->direction_output = ssb_gpio_chipco_direction_output;
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#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
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chip->to_irq = ssb_gpio_to_irq;
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#endif
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chip->ngpio = 16;
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/* There is just one SoC in one device and its GPIO addresses should be
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* deterministic to address them more easily. The other buses could get
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* a random base number. */
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if (bus->bustype == SSB_BUSTYPE_SSB)
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chip->base = 0;
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else
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chip->base = -1;
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err = ssb_gpio_irq_chipco_domain_init(bus);
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if (err)
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return err;
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err = gpiochip_add(chip);
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if (err) {
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ssb_gpio_irq_chipco_domain_exit(bus);
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return err;
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}
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return 0;
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}
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/**************************************************
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* EXTIF
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**************************************************/
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#ifdef CONFIG_SSB_DRIVER_EXTIF
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static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
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}
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static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio,
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int value)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
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}
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static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
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unsigned gpio)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
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return 0;
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}
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static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct ssb_bus *bus = ssb_gpio_get_bus(chip);
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ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
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ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
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return 0;
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}
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#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
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static void ssb_gpio_irq_extif_mask(struct irq_data *d)
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{
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struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
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int gpio = irqd_to_hwirq(d);
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ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
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}
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static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
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{
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struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
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int gpio = irqd_to_hwirq(d);
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u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));
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ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
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ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
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}
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static struct irq_chip ssb_gpio_irq_extif_chip = {
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.name = "SSB-GPIO-EXTIF",
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.irq_mask = ssb_gpio_irq_extif_mask,
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.irq_unmask = ssb_gpio_irq_extif_unmask,
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};
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static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
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{
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struct ssb_bus *bus = dev_id;
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struct ssb_extif *extif = &bus->extif;
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u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
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u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
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u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
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unsigned long irqs = (val ^ pol) & mask;
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int gpio;
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if (!irqs)
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return IRQ_NONE;
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for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
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generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
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ssb_extif_gpio_polarity(extif, irqs, val & irqs);
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return IRQ_HANDLED;
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}
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static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
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{
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struct ssb_extif *extif = &bus->extif;
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struct gpio_chip *chip = &bus->gpio;
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int gpio, hwirq, err;
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if (bus->bustype != SSB_BUSTYPE_SSB)
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return 0;
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bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
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&irq_domain_simple_ops, extif);
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if (!bus->irq_domain) {
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err = -ENODEV;
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goto err_irq_domain;
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}
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for (gpio = 0; gpio < chip->ngpio; gpio++) {
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int irq = irq_create_mapping(bus->irq_domain, gpio);
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irq_set_chip_data(irq, bus);
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irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
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handle_simple_irq);
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}
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hwirq = ssb_mips_irq(bus->extif.dev) + 2;
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err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
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"gpio", bus);
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if (err)
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goto err_req_irq;
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ssb_extif_gpio_intmask(&bus->extif, ~0, 0);
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return 0;
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err_req_irq:
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for (gpio = 0; gpio < chip->ngpio; gpio++) {
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int irq = irq_find_mapping(bus->irq_domain, gpio);
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irq_dispose_mapping(irq);
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}
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irq_domain_remove(bus->irq_domain);
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err_irq_domain:
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return err;
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}
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static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
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{
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struct ssb_extif *extif = &bus->extif;
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struct gpio_chip *chip = &bus->gpio;
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int gpio;
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if (bus->bustype != SSB_BUSTYPE_SSB)
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return;
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free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
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for (gpio = 0; gpio < chip->ngpio; gpio++) {
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int irq = irq_find_mapping(bus->irq_domain, gpio);
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irq_dispose_mapping(irq);
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}
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irq_domain_remove(bus->irq_domain);
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}
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#else
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static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
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{
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return 0;
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}
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static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
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{
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}
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#endif
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static int ssb_gpio_extif_init(struct ssb_bus *bus)
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{
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struct gpio_chip *chip = &bus->gpio;
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int err;
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chip->label = "ssb_extif_gpio";
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chip->owner = THIS_MODULE;
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chip->get = ssb_gpio_extif_get_value;
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chip->set = ssb_gpio_extif_set_value;
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chip->direction_input = ssb_gpio_extif_direction_input;
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chip->direction_output = ssb_gpio_extif_direction_output;
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#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
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chip->to_irq = ssb_gpio_to_irq;
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#endif
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chip->ngpio = 5;
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/* There is just one SoC in one device and its GPIO addresses should be
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* deterministic to address them more easily. The other buses could get
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* a random base number. */
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if (bus->bustype == SSB_BUSTYPE_SSB)
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chip->base = 0;
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else
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chip->base = -1;
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err = ssb_gpio_irq_extif_domain_init(bus);
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if (err)
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return err;
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err = gpiochip_add(chip);
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if (err) {
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ssb_gpio_irq_extif_domain_exit(bus);
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return err;
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}
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return 0;
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}
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#else
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static int ssb_gpio_extif_init(struct ssb_bus *bus)
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{
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return -ENOTSUPP;
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}
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#endif
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/**************************************************
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* Init
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**************************************************/
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int ssb_gpio_init(struct ssb_bus *bus)
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{
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if (ssb_chipco_available(&bus->chipco))
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return ssb_gpio_chipco_init(bus);
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else if (ssb_extif_available(&bus->extif))
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return ssb_gpio_extif_init(bus);
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else
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SSB_WARN_ON(1);
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return -1;
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}
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int ssb_gpio_unregister(struct ssb_bus *bus)
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{
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if (ssb_chipco_available(&bus->chipco) ||
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ssb_extif_available(&bus->extif)) {
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gpiochip_remove(&bus->gpio);
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return 0;
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} else {
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SSB_WARN_ON(1);
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}
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return -1;
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}
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