265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/*-
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* Copyright (c) 2017 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Support routines usable by any SoC sdhci bridge driver that uses gpio pins
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* for card detect and write protect, and uses FDT data to describe those pins.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/taskqueue.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/mmc/bridge.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/sdhci/sdhci.h>
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#include <dev/sdhci/sdhci_fdt_gpio.h>
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struct sdhci_fdt_gpio {
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device_t dev;
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struct sdhci_slot * slot;
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gpio_pin_t wp_pin;
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gpio_pin_t cd_pin;
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void * cd_ihandler;
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struct resource * cd_ires;
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int cd_irid;
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bool wp_disabled;
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bool wp_inverted;
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bool cd_disabled;
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bool cd_inverted;
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};
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/*
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* Card detect interrupt handler.
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*/
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static void
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cd_intr(void *arg)
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{
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struct sdhci_fdt_gpio *gpio = arg;
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sdhci_handle_card_present(gpio->slot, sdhci_fdt_gpio_get_present(gpio));
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}
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/*
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* Card detect setup.
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*/
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static void
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cd_setup(struct sdhci_fdt_gpio *gpio, phandle_t node)
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{
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int pincaps;
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device_t dev;
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const char *cd_mode_str;
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dev = gpio->dev;
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/*
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* If the device is flagged as non-removable, set that slot option, and
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* set a flag to make sdhci_fdt_gpio_get_present() always return true.
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*/
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if (OF_hasprop(node, "non-removable")) {
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gpio->slot->opt |= SDHCI_NON_REMOVABLE;
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gpio->cd_disabled = true;
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if (bootverbose)
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device_printf(dev, "Non-removable media\n");
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return;
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}
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/*
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* If there is no cd-gpios property, then presumably the hardware
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* PRESENT_STATE register and interrupts will reflect card state
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* properly, and there's nothing more for us to do. Our get_present()
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* will return sdhci_generic_get_card_present() because cd_pin is NULL.
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*
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* If there is a property, make sure we can read the pin.
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*/
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if (gpio_pin_get_by_ofw_property(dev, node, "cd-gpios", &gpio->cd_pin))
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return;
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if (gpio_pin_getcaps(gpio->cd_pin, &pincaps) != 0 ||
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!(pincaps & GPIO_PIN_INPUT)) {
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device_printf(dev, "Cannot read card-detect gpio pin; "
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"setting card-always-present flag.\n");
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gpio->cd_disabled = true;
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return;
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}
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if (OF_hasprop(node, "cd-inverted"))
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gpio->cd_inverted = true;
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/*
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* If the pin can trigger an interrupt on both rising and falling edges,
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* we can use it to detect card presence changes. If not, we'll request
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* card presence polling instead of using interrupts.
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*/
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if (!(pincaps & GPIO_INTR_EDGE_BOTH)) {
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if (bootverbose)
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device_printf(dev, "Cannot configure "
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"GPIO_INTR_EDGE_BOTH for card detect\n");
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goto without_interrupts;
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}
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/*
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* Create an interrupt resource from the pin and set up the interrupt.
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*/
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if ((gpio->cd_ires = gpio_alloc_intr_resource(dev, &gpio->cd_irid,
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RF_ACTIVE, gpio->cd_pin, GPIO_INTR_EDGE_BOTH)) == NULL) {
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if (bootverbose)
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device_printf(dev, "Cannot allocate an IRQ for card "
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"detect GPIO\n");
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goto without_interrupts;
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}
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if (bus_setup_intr(dev, gpio->cd_ires, INTR_TYPE_BIO | INTR_MPSAFE,
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NULL, cd_intr, gpio, &gpio->cd_ihandler) != 0) {
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device_printf(dev, "Unable to setup card-detect irq handler\n");
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gpio->cd_ihandler = NULL;
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goto without_interrupts;
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}
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without_interrupts:
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/*
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* If we have a readable gpio pin, but didn't successfully configure
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* gpio interrupts, ask the sdhci driver to poll from a callout.
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*/
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if (gpio->cd_ihandler == NULL) {
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cd_mode_str = "polling";
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gpio->slot->quirks |= SDHCI_QUIRK_POLL_CARD_PRESENT;
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} else {
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cd_mode_str = "interrupts";
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}
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if (bootverbose) {
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device_printf(dev, "Card presence detect on %s pin %u, "
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"configured for %s.\n",
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device_get_nameunit(gpio->cd_pin->dev), gpio->cd_pin->pin,
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cd_mode_str);
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}
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}
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/*
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* Write protect setup.
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*/
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static void
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wp_setup(struct sdhci_fdt_gpio *gpio, phandle_t node)
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{
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device_t dev;
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dev = gpio->dev;
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if (OF_hasprop(node, "wp-disable")) {
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gpio->wp_disabled = true;
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if (bootverbose)
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device_printf(dev, "Write protect disabled\n");
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return;
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}
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if (gpio_pin_get_by_ofw_property(dev, node, "wp-gpios", &gpio->wp_pin))
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return;
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if (OF_hasprop(node, "wp-inverted"))
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gpio->wp_inverted = true;
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if (bootverbose)
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device_printf(dev, "Write protect switch on %s pin %u\n",
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device_get_nameunit(gpio->wp_pin->dev), gpio->wp_pin->pin);
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}
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struct sdhci_fdt_gpio *
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sdhci_fdt_gpio_setup(device_t dev, struct sdhci_slot *slot)
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{
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phandle_t node;
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struct sdhci_fdt_gpio *gpio;
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gpio = malloc(sizeof(*gpio), M_DEVBUF, M_ZERO | M_WAITOK);
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gpio->dev = dev;
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gpio->slot = slot;
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node = ofw_bus_get_node(dev);
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wp_setup(gpio, node);
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cd_setup(gpio, node);
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return (gpio);
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}
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void
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sdhci_fdt_gpio_teardown(struct sdhci_fdt_gpio *gpio)
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{
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if (gpio == NULL)
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return;
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if (gpio->cd_ihandler != NULL)
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bus_teardown_intr(gpio->dev, gpio->cd_ires, gpio->cd_ihandler);
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if (gpio->wp_pin != NULL)
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gpio_pin_release(gpio->wp_pin);
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if (gpio->cd_pin != NULL)
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gpio_pin_release(gpio->cd_pin);
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if (gpio->cd_ires != NULL)
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bus_release_resource(gpio->dev, SYS_RES_IRQ, 0, gpio->cd_ires);
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free(gpio, M_DEVBUF);
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}
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bool
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sdhci_fdt_gpio_get_present(struct sdhci_fdt_gpio *gpio)
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{
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bool pinstate;
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if (gpio->cd_disabled)
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return (true);
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if (gpio->cd_pin == NULL)
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return (sdhci_generic_get_card_present(gpio->slot->bus,
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gpio->slot));
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gpio_pin_is_active(gpio->cd_pin, &pinstate);
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return (pinstate ^ gpio->cd_inverted);
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}
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int
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sdhci_fdt_gpio_get_readonly(struct sdhci_fdt_gpio *gpio)
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{
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bool pinstate;
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if (gpio->wp_disabled)
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return (false);
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if (gpio->wp_pin == NULL)
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return (sdhci_generic_get_ro(gpio->slot->bus, gpio->slot->dev));
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gpio_pin_is_active(gpio->wp_pin, &pinstate);
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return (pinstate ^ gpio->wp_inverted);
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}
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