Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 620 insertions, 0 deletions

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
new file mode 100644
index 000000000..b949a4468
--- /dev/null
+++ b/drivers/mmc/core/host.c
@@ -0,0 +1,620 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/mmc/core/host.c
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright (C) 2007-2008 Pierre Ossman
+ *  Copyright (C) 2010 Linus Walleij
+ *
+ *  MMC host class device management
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/pagemap.h>
+#include <linux/pm_wakeup.h>
+#include <linux/export.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/slot-gpio.h>
+
+#include "core.h"
+#include "host.h"
+#include "slot-gpio.h"
+#include "pwrseq.h"
+#include "sdio_ops.h"
+
+#define cls_dev_to_mmc_host(d)	container_of(d, struct mmc_host, class_dev)
+
+static DEFINE_IDA(mmc_host_ida);
+
+#ifdef CONFIG_PM_SLEEP
+static int mmc_host_class_prepare(struct device *dev)
+{
+	struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+	/*
+	 * It's safe to access the bus_ops pointer, as both userspace and the
+	 * workqueue for detecting cards are frozen at this point.
+	 */
+	if (!host->bus_ops)
+		return 0;
+
+	/* Validate conditions for system suspend. */
+	if (host->bus_ops->pre_suspend)
+		return host->bus_ops->pre_suspend(host);
+
+	return 0;
+}
+
+static void mmc_host_class_complete(struct device *dev)
+{
+	struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+	_mmc_detect_change(host, 0, false);
+}
+
+static const struct dev_pm_ops mmc_host_class_dev_pm_ops = {
+	.prepare = mmc_host_class_prepare,
+	.complete = mmc_host_class_complete,
+};
+
+#define MMC_HOST_CLASS_DEV_PM_OPS (&mmc_host_class_dev_pm_ops)
+#else
+#define MMC_HOST_CLASS_DEV_PM_OPS NULL
+#endif
+
+static void mmc_host_classdev_release(struct device *dev)
+{
+	struct mmc_host *host = cls_dev_to_mmc_host(dev);
+	wakeup_source_unregister(host->ws);
+	if (of_alias_get_id(host->parent->of_node, "mmc") < 0)
+		ida_simple_remove(&mmc_host_ida, host->index);
+	kfree(host);
+}
+
+static int mmc_host_classdev_shutdown(struct device *dev)
+{
+	struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+	__mmc_stop_host(host);
+	return 0;
+}
+
+static struct class mmc_host_class = {
+	.name		= "mmc_host",
+	.dev_release	= mmc_host_classdev_release,
+	.shutdown_pre	= mmc_host_classdev_shutdown,
+	.pm		= MMC_HOST_CLASS_DEV_PM_OPS,
+};
+
+int mmc_register_host_class(void)
+{
+	return class_register(&mmc_host_class);
+}
+
+void mmc_unregister_host_class(void)
+{
+	class_unregister(&mmc_host_class);
+}
+
+void mmc_retune_enable(struct mmc_host *host)
+{
+	host->can_retune = 1;
+	if (host->retune_period)
+		mod_timer(&host->retune_timer,
+			  jiffies + host->retune_period * HZ);
+}
+
+/*
+ * Pause re-tuning for a small set of operations.  The pause begins after the
+ * next command and after first doing re-tuning.
+ */
+void mmc_retune_pause(struct mmc_host *host)
+{
+	if (!host->retune_paused) {
+		host->retune_paused = 1;
+		mmc_retune_needed(host);
+		mmc_retune_hold(host);
+	}
+}
+EXPORT_SYMBOL(mmc_retune_pause);
+
+void mmc_retune_unpause(struct mmc_host *host)
+{
+	if (host->retune_paused) {
+		host->retune_paused = 0;
+		mmc_retune_release(host);
+	}
+}
+EXPORT_SYMBOL(mmc_retune_unpause);
+
+void mmc_retune_disable(struct mmc_host *host)
+{
+	mmc_retune_unpause(host);
+	host->can_retune = 0;
+	del_timer_sync(&host->retune_timer);
+	host->retune_now = 0;
+	host->need_retune = 0;
+}
+
+void mmc_retune_timer_stop(struct mmc_host *host)
+{
+	del_timer_sync(&host->retune_timer);
+}
+EXPORT_SYMBOL(mmc_retune_timer_stop);
+
+void mmc_retune_hold(struct mmc_host *host)
+{
+	if (!host->hold_retune)
+		host->retune_now = 1;
+	host->hold_retune += 1;
+}
+
+void mmc_retune_release(struct mmc_host *host)
+{
+	if (host->hold_retune)
+		host->hold_retune -= 1;
+	else
+		WARN_ON(1);
+}
+EXPORT_SYMBOL(mmc_retune_release);
+
+int mmc_retune(struct mmc_host *host)
+{
+	bool return_to_hs400 = false;
+	int err;
+
+	if (host->retune_now)
+		host->retune_now = 0;
+	else
+		return 0;
+
+	if (!host->need_retune || host->doing_retune || !host->card)
+		return 0;
+
+	host->need_retune = 0;
+
+	host->doing_retune = 1;
+
+	if (host->ios.timing == MMC_TIMING_MMC_HS400) {
+		err = mmc_hs400_to_hs200(host->card);
+		if (err)
+			goto out;
+
+		return_to_hs400 = true;
+	}
+
+	err = mmc_execute_tuning(host->card);
+	if (err)
+		goto out;
+
+	if (return_to_hs400)
+		err = mmc_hs200_to_hs400(host->card);
+out:
+	host->doing_retune = 0;
+
+	return err;
+}
+
+static void mmc_retune_timer(struct timer_list *t)
+{
+	struct mmc_host *host = from_timer(host, t, retune_timer);
+
+	mmc_retune_needed(host);
+}
+
+/**
+ *	mmc_of_parse() - parse host's device-tree node
+ *	@host: host whose node should be parsed.
+ *
+ * To keep the rest of the MMC subsystem unaware of whether DT has been
+ * used to to instantiate and configure this host instance or not, we
+ * parse the properties and set respective generic mmc-host flags and
+ * parameters.
+ */
+int mmc_of_parse(struct mmc_host *host)
+{
+	struct device *dev = host->parent;
+	u32 bus_width, drv_type, cd_debounce_delay_ms;
+	int ret;
+
+	if (!dev || !dev_fwnode(dev))
+		return 0;
+
+	/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
+	if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
+		dev_dbg(host->parent,
+			"\"bus-width\" property is missing, assuming 1 bit.\n");
+		bus_width = 1;
+	}
+
+	switch (bus_width) {
+	case 8:
+		host->caps |= MMC_CAP_8_BIT_DATA;
+		fallthrough;	/* Hosts capable of 8-bit can also do 4 bits */
+	case 4:
+		host->caps |= MMC_CAP_4_BIT_DATA;
+		break;
+	case 1:
+		break;
+	default:
+		dev_err(host->parent,
+			"Invalid \"bus-width\" value %u!\n", bus_width);
+		return -EINVAL;
+	}
+
+	/* f_max is obtained from the optional "max-frequency" property */
+	device_property_read_u32(dev, "max-frequency", &host->f_max);
+
+	/*
+	 * Configure CD and WP pins. They are both by default active low to
+	 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
+	 * mmc-gpio helpers are used to attach, configure and use them. If
+	 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
+	 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
+	 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
+	 * is set. If the "non-removable" property is found, the
+	 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
+	 * configuration is performed.
+	 */
+
+	/* Parse Card Detection */
+
+	if (device_property_read_bool(dev, "non-removable")) {
+		host->caps |= MMC_CAP_NONREMOVABLE;
+	} else {
+		if (device_property_read_bool(dev, "cd-inverted"))
+			host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+
+		if (device_property_read_u32(dev, "cd-debounce-delay-ms",
+					     &cd_debounce_delay_ms))
+			cd_debounce_delay_ms = 200;
+
+		if (device_property_read_bool(dev, "broken-cd"))
+			host->caps |= MMC_CAP_NEEDS_POLL;
+
+		ret = mmc_gpiod_request_cd(host, "cd", 0, false,
+					   cd_debounce_delay_ms * 1000);
+		if (!ret)
+			dev_info(host->parent, "Got CD GPIO\n");
+		else if (ret != -ENOENT && ret != -ENOSYS)
+			return ret;
+	}
+
+	/* Parse Write Protection */
+
+	if (device_property_read_bool(dev, "wp-inverted"))
+		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
+	ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
+	if (!ret)
+		dev_info(host->parent, "Got WP GPIO\n");
+	else if (ret != -ENOENT && ret != -ENOSYS)
+		return ret;
+
+	if (device_property_read_bool(dev, "disable-wp"))
+		host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
+
+	if (device_property_read_bool(dev, "cap-sd-highspeed"))
+		host->caps |= MMC_CAP_SD_HIGHSPEED;
+	if (device_property_read_bool(dev, "cap-mmc-highspeed"))
+		host->caps |= MMC_CAP_MMC_HIGHSPEED;
+	if (device_property_read_bool(dev, "sd-uhs-sdr12"))
+		host->caps |= MMC_CAP_UHS_SDR12;
+	if (device_property_read_bool(dev, "sd-uhs-sdr25"))
+		host->caps |= MMC_CAP_UHS_SDR25;
+	if (device_property_read_bool(dev, "sd-uhs-sdr50"))
+		host->caps |= MMC_CAP_UHS_SDR50;
+	if (device_property_read_bool(dev, "sd-uhs-sdr104"))
+		host->caps |= MMC_CAP_UHS_SDR104;
+	if (device_property_read_bool(dev, "sd-uhs-ddr50"))
+		host->caps |= MMC_CAP_UHS_DDR50;
+	if (device_property_read_bool(dev, "cap-power-off-card"))
+		host->caps |= MMC_CAP_POWER_OFF_CARD;
+	if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
+		host->caps |= MMC_CAP_HW_RESET;
+	if (device_property_read_bool(dev, "cap-sdio-irq"))
+		host->caps |= MMC_CAP_SDIO_IRQ;
+	if (device_property_read_bool(dev, "full-pwr-cycle"))
+		host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
+	if (device_property_read_bool(dev, "full-pwr-cycle-in-suspend"))
+		host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
+	if (device_property_read_bool(dev, "keep-power-in-suspend"))
+		host->pm_caps |= MMC_PM_KEEP_POWER;
+	if (device_property_read_bool(dev, "wakeup-source") ||
+	    device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
+		host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
+	if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
+		host->caps |= MMC_CAP_3_3V_DDR;
+	if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
+		host->caps |= MMC_CAP_1_8V_DDR;
+	if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
+		host->caps |= MMC_CAP_1_2V_DDR;
+	if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
+		host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
+	if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
+		host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
+	if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
+		host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
+	if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
+		host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
+	if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
+		host->caps2 |= MMC_CAP2_HS400_ES;
+	if (device_property_read_bool(dev, "no-sdio"))
+		host->caps2 |= MMC_CAP2_NO_SDIO;
+	if (device_property_read_bool(dev, "no-sd"))
+		host->caps2 |= MMC_CAP2_NO_SD;
+	if (device_property_read_bool(dev, "no-mmc"))
+		host->caps2 |= MMC_CAP2_NO_MMC;
+
+	/* Must be after "non-removable" check */
+	if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
+		if (host->caps & MMC_CAP_NONREMOVABLE)
+			host->fixed_drv_type = drv_type;
+		else
+			dev_err(host->parent,
+				"can't use fixed driver type, media is removable\n");
+	}
+
+	host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
+	if (host->dsr_req && (host->dsr & ~0xffff)) {
+		dev_err(host->parent,
+			"device tree specified broken value for DSR: 0x%x, ignoring\n",
+			host->dsr);
+		host->dsr_req = 0;
+	}
+
+	device_property_read_u32(dev, "post-power-on-delay-ms",
+				 &host->ios.power_delay_ms);
+
+	return mmc_pwrseq_alloc(host);
+}
+
+EXPORT_SYMBOL(mmc_of_parse);
+
+/**
+ * mmc_of_parse_voltage - return mask of supported voltages
+ * @np: The device node need to be parsed.
+ * @mask: mask of voltages available for MMC/SD/SDIO
+ *
+ * Parse the "voltage-ranges" DT property, returning zero if it is not
+ * found, negative errno if the voltage-range specification is invalid,
+ * or one if the voltage-range is specified and successfully parsed.
+ */
+int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
+{
+	const u32 *voltage_ranges;
+	int num_ranges, i;
+
+	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
+	if (!voltage_ranges) {
+		pr_debug("%pOF: voltage-ranges unspecified\n", np);
+		return 0;
+	}
+	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
+	if (!num_ranges) {
+		pr_err("%pOF: voltage-ranges empty\n", np);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < num_ranges; i++) {
+		const int j = i * 2;
+		u32 ocr_mask;
+
+		ocr_mask = mmc_vddrange_to_ocrmask(
+				be32_to_cpu(voltage_ranges[j]),
+				be32_to_cpu(voltage_ranges[j + 1]));
+		if (!ocr_mask) {
+			pr_err("%pOF: voltage-range #%d is invalid\n",
+				np, i);
+			return -EINVAL;
+		}
+		*mask |= ocr_mask;
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL(mmc_of_parse_voltage);
+
+/**
+ * mmc_first_nonreserved_index() - get the first index that is not reserved
+ */
+static int mmc_first_nonreserved_index(void)
+{
+	int max;
+
+	max = of_alias_get_highest_id("mmc");
+	if (max < 0)
+		return 0;
+
+	return max + 1;
+}
+
+/**
+ *	mmc_alloc_host - initialise the per-host structure.
+ *	@extra: sizeof private data structure
+ *	@dev: pointer to host device model structure
+ *
+ *	Initialise the per-host structure.
+ */
+struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
+{
+	int index;
+	struct mmc_host *host;
+	int alias_id, min_idx, max_idx;
+
+	host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
+	if (!host)
+		return NULL;
+
+	/* scanning will be enabled when we're ready */
+	host->rescan_disable = 1;
+
+	alias_id = of_alias_get_id(dev->of_node, "mmc");
+	if (alias_id >= 0) {
+		index = alias_id;
+	} else {
+		min_idx = mmc_first_nonreserved_index();
+		max_idx = 0;
+
+		index = ida_simple_get(&mmc_host_ida, min_idx, max_idx, GFP_KERNEL);
+		if (index < 0) {
+			kfree(host);
+			return NULL;
+		}
+	}
+
+	host->index = index;
+
+	dev_set_name(&host->class_dev, "mmc%d", host->index);
+	host->ws = wakeup_source_register(NULL, dev_name(&host->class_dev));
+
+	host->parent = dev;
+	host->class_dev.parent = dev;
+	host->class_dev.class = &mmc_host_class;
+	device_initialize(&host->class_dev);
+	device_enable_async_suspend(&host->class_dev);
+
+	if (mmc_gpio_alloc(host)) {
+		put_device(&host->class_dev);
+		return NULL;
+	}
+
+	spin_lock_init(&host->lock);
+	init_waitqueue_head(&host->wq);
+	INIT_DELAYED_WORK(&host->detect, mmc_rescan);
+	INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
+	timer_setup(&host->retune_timer, mmc_retune_timer, 0);
+
+	/*
+	 * By default, hosts do not support SGIO or large requests.
+	 * They have to set these according to their abilities.
+	 */
+	host->max_segs = 1;
+	host->max_seg_size = PAGE_SIZE;
+
+	host->max_req_size = PAGE_SIZE;
+	host->max_blk_size = 512;
+	host->max_blk_count = PAGE_SIZE / 512;
+
+	host->fixed_drv_type = -EINVAL;
+	host->ios.power_delay_ms = 10;
+	host->ios.power_mode = MMC_POWER_UNDEFINED;
+
+	return host;
+}
+
+EXPORT_SYMBOL(mmc_alloc_host);
+
+static void devm_mmc_host_release(struct device *dev, void *res)
+{
+	mmc_free_host(*(struct mmc_host **)res);
+}
+
+struct mmc_host *devm_mmc_alloc_host(struct device *dev, int extra)
+{
+	struct mmc_host **dr, *host;
+
+	dr = devres_alloc(devm_mmc_host_release, sizeof(*dr), GFP_KERNEL);
+	if (!dr)
+		return ERR_PTR(-ENOMEM);
+
+	host = mmc_alloc_host(extra, dev);
+	if (IS_ERR(host)) {
+		devres_free(dr);
+		return host;
+	}
+
+	*dr = host;
+	devres_add(dev, dr);
+
+	return host;
+}
+EXPORT_SYMBOL(devm_mmc_alloc_host);
+
+static int mmc_validate_host_caps(struct mmc_host *host)
+{
+	if (host->caps & MMC_CAP_SDIO_IRQ && !host->ops->enable_sdio_irq) {
+		dev_warn(host->parent, "missing ->enable_sdio_irq() ops\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/**
+ *	mmc_add_host - initialise host hardware
+ *	@host: mmc host
+ *
+ *	Register the host with the driver model. The host must be
+ *	prepared to start servicing requests before this function
+ *	completes.
+ */
+int mmc_add_host(struct mmc_host *host)
+{
+	int err;
+
+	err = mmc_validate_host_caps(host);
+	if (err)
+		return err;
+
+	err = device_add(&host->class_dev);
+	if (err)
+		return err;
+
+	led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
+
+#ifdef CONFIG_DEBUG_FS
+	mmc_add_host_debugfs(host);
+#endif
+
+	mmc_start_host(host);
+	return 0;
+}
+
+EXPORT_SYMBOL(mmc_add_host);
+
+/**
+ *	mmc_remove_host - remove host hardware
+ *	@host: mmc host
+ *
+ *	Unregister and remove all cards associated with this host,
+ *	and power down the MMC bus. No new requests will be issued
+ *	after this function has returned.
+ */
+void mmc_remove_host(struct mmc_host *host)
+{
+	mmc_stop_host(host);
+
+#ifdef CONFIG_DEBUG_FS
+	mmc_remove_host_debugfs(host);
+#endif
+
+	device_del(&host->class_dev);
+
+	led_trigger_unregister_simple(host->led);
+}
+
+EXPORT_SYMBOL(mmc_remove_host);
+
+/**
+ *	mmc_free_host - free the host structure
+ *	@host: mmc host
+ *
+ *	Free the host once all references to it have been dropped.
+ */
+void mmc_free_host(struct mmc_host *host)
+{
+	cancel_delayed_work_sync(&host->detect);
+	mmc_pwrseq_free(host);
+	put_device(&host->class_dev);
+}
+
+EXPORT_SYMBOL(mmc_free_host);