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linux/drivers/mmc/core/core.h

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/*
mmc: Move core functions to subdir Create a "core" subdirectory to house the central bus handling functions. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-02-28 14:33:10 +00:00
* linux/drivers/mmc/core/core.h
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
*
* Copyright (C) 2003 Russell King, All Rights Reserved.
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
* Copyright 2007 Pierre Ossman
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
#ifndef _MMC_CORE_CORE_H
#define _MMC_CORE_CORE_H
[MMC] Add MMC class devices Create a mmc_host class to allow enumeration of MMC host controllers even though they have no card(s) inserted. Patch based on work by Pierre Ossman. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-08-19 08:41:24 +00:00
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
#include <linux/delay.h>
mmc: core: First step in cleaning up private mmc header files This is the first step in cleaning up the private mmc header files. In this change we makes sure each header file builds standalone, as that helps to resolve dependencies. While changing this, it also seems reasonable to stop including other headers from inside a header itself which it don't depend upon. Additionally, in some cases such dependencies are better resolved by forward declaring the needed struct. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
2017-01-13 13:14:07 +00:00
#include <linux/sched.h>
struct mmc_host;
struct mmc_card;
mmc: core: Move public functions from core.h to private headers A significant amount of functions are available through the public mmc core.h header file. Let's slim down this public mmc interface, as to prevent users from abusing it, by moving some of the functions to private mmc header files. This change concentrates on moving the functions into private mmc headers, following changes may continue with additional clean-ups, as an example some functions can be turned into static. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
2017-01-13 13:14:08 +00:00
struct mmc_request;
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
#define MMC_CMD_RETRIES 3
mmc: add bus handler Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-30 23:11:32 +00:00
struct mmc_bus_ops {
void (*remove)(struct mmc_host *);
void (*detect)(struct mmc_host *);
mmc: core: Validate suspend prerequisites for SDIO at SUSPEND_PREPARE This patch moves the validation for all the suspend prerequisites to be done at SUSPEND_PREPARE notification. Previously in the SDIO case parts of the validation was done from mmc_suspend_host. This patch invents a new pre_suspend bus_ops callback and implements it for SDIO. Returning an error code from it, will mean at SUSPEND_PREPARE notification, the card will be removed before proceeding with the suspend sequence. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 15:03:37 +00:00
int (*pre_suspend)(struct mmc_host *);
mmc: propagate error codes back from bus drivers' suspend/resume methods Especially for SDIO drivers which may have special conditions/errors to report, it is a good thing to relay the returned error code back to upper layers. This also allows for the rationalization of the resume path where code to "remove" a no-longer-existing or replaced card was duplicated into the MMC, SD and SDIO bus drivers. In the SDIO case, if a function suspend method returns an error, then all previously suspended functions are resumed and the error returned. An exception is made for -ENOSYS which the core interprets as "we don't support suspend so just kick the card out for suspend and return success". When resuming SDIO cards, the core code only validates the manufacturer and product IDs to make sure the same kind of card is still present before invoking functions resume methods. It's the function driver's responsibility to perform further tests to confirm that the actual same card is present (same MAC address, etc.) and return an error otherwise. Signed-off-by: Nicolas Pitre <nico@marvell.com> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-22 23:45:29 +00:00
int (*suspend)(struct mmc_host *);
int (*resume)(struct mmc_host *);
mmc: core: Add bus_ops for runtime pm callbacks SDIO is the only protocol that uses runtime pm for the card device right now. To provide the option for sd and mmc to use runtime pm as well the bus_ops callback are extended with two new functions. One for runtime_suspend and one for runtime_resume. This patch will also implement the callbacks for SDIO to make sure existing functionality is maintained. It also prepares to move away from using the mmc_power_restore_host API, since it is not needed when using runtime PM. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-05-02 12:02:37 +00:00
int (*runtime_suspend)(struct mmc_host *);
int (*runtime_resume)(struct mmc_host *);
mmc: propagate power save/restore ops return value Allow power save/restore and their relevant mmc_bus_ops handlers exit with a return value. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Tested-by: Luciano Coelho <luciano.coelho@nokia.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2010-10-02 11:54:06 +00:00
int (*power_save)(struct mmc_host *);
int (*power_restore)(struct mmc_host *);
mmc: allow upper layers to know immediately if card has been removed Add a function mmc_detect_card_removed() which upper layers can use to determine immediately if a card has been removed. This function should be called after an I/O request fails so that all queued I/O requests can be errored out immediately instead of waiting for the card device to be removed. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Sujit Reddy Thumma <sthumma@codeaurora.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-11-28 14:22:00 +00:00
int (*alive)(struct mmc_host *);
mmc: core: Extend shutdown sequence to handle bus operations By adding an optional .shutdown callback to the bus_ops struct we provide the possibility to let each bus type handle it's shutdown requirements. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-06-10 15:03:41 +00:00
int (*shutdown)(struct mmc_host *);
mmc: core: refactor the hw_reset routines Move the (e)MMC specific hw_reset code from core.c into mmc.c. Call the code from the new bus_ops member "reset". This also allows for adding a SD card specific reset procedure. Signed-off-by: Johan Rudholm <johanru@axis.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-01-12 14:38:05 +00:00
int (*reset)(struct mmc_host *);
mmc: add bus handler Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-30 23:11:32 +00:00
};
void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
void mmc_detach_bus(struct mmc_host *host);
mmc: Add SDIO function devicetree subnode parsing This adds SDIO devicetree subnode parsing to the mmc core. While SDIO devices are runtime probable they sometimes need nonprobable additional information on embedded systems, like an additional gpio interrupt or a clock. This patch makes it possible to supply this information from the devicetree. SDIO drivers will find a pointer to the devicenode in their devices of_node pointer. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> [hdegoede@redhat.com: Misc. cleanups] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-06-30 09:07:25 +00:00
struct device_node *mmc_of_find_child_device(struct mmc_host *host,
unsigned func_num);
mmc: add erase, secure erase, trim and secure trim operations SD/MMC cards tend to support an erase operation. In addition, eMMC v4.4 cards can support secure erase, trim and secure trim operations that are all variants of the basic erase command. SD/MMC device attributes "erase_size" and "preferred_erase_size" have been added. "erase_size" is the minimum size, in bytes, of an erase operation. For MMC, "erase_size" is the erase group size reported by the card. Note that "erase_size" does not apply to trim or secure trim operations where the minimum size is always one 512 byte sector. For SD, "erase_size" is 512 if the card is block-addressed, 0 otherwise. SD/MMC cards can erase an arbitrarily large area up to and including the whole card. When erasing a large area it may be desirable to do it in smaller chunks for three reasons: 1. A single erase command will make all other I/O on the card wait. This is not a problem if the whole card is being erased, but erasing one partition will make I/O for another partition on the same card wait for the duration of the erase - which could be a several minutes. 2. To be able to inform the user of erase progress. 3. The erase timeout becomes too large to be very useful. Because the erase timeout contains a margin which is multiplied by the size of the erase area, the value can end up being several minutes for large areas. "erase_size" is not the most efficient unit to erase (especially for SD where it is just one sector), hence "preferred_erase_size" provides a good chunk size for erasing large areas. For MMC, "preferred_erase_size" is the high-capacity erase size if a card specifies one, otherwise it is based on the capacity of the card. For SD, "preferred_erase_size" is the allocation unit size specified by the card. "preferred_erase_size" is in bytes. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Acked-by: Jens Axboe <axboe@kernel.dk> Cc: Kyungmin Park <kmpark@infradead.org> Cc: Madhusudhan Chikkature <madhu.cr@ti.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Ben Gardiner <bengardiner@nanometrics.ca> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11 21:17:46 +00:00
void mmc_init_erase(struct mmc_card *card);
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
void mmc_set_chip_select(struct mmc_host *host, int mode);
mmc: add bus handler Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-30 23:11:32 +00:00
void mmc_set_clock(struct mmc_host *host, unsigned int hz);
void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
mmc: core: Clarify usage of mmc_set_signal_voltage() The mmc_set_signal_voltage() function is used for SD/SDIO when switching to 1.8V for UHS mode. To clarify this let's do the following changes. - We are always providing MMC_SIGNAL_VOLTAGE_180 as the signal_voltage parameter to the function. Then, let's just remove the parameter as it serves no purpose. - Rename the function to mmc_set_uhs_voltage(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com> Tested-by: Jan Glauber <jglauber@cavium.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
2017-01-25 09:25:01 +00:00
int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr);
mmc: core: Rename __mmc_set_signal_voltage() to mmc_set_signal_voltage() Earlier the mmc_set_signal_voltage() existed, but since it has been renamed to mmc_set_uhs_voltage(), we can now use that name instead. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com> Tested-by: Jan Glauber <jglauber@cavium.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
2017-01-25 10:12:34 +00:00
int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);
mmc: add bus handler Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-30 23:11:32 +00:00
void mmc_set_timing(struct mmc_host *host, unsigned int timing);
mmc: sd: add support for driver type selection This patch adds support for setting driver strength during UHS-I initialization procedure. Since UHS-I cards set S18A (bit 24) in response to ACMD41, we use this as a base for UHS-I initialization. We modify the parameter list of mmc_sd_get_cid() so that we can save the ROCR from ACMD41 to check whether bit 24 is set. We decide whether the Host Controller supports A, C, or D driver type depending on the Capabilities register. Driver type B is suported by default. We then set the appropriate driver type for the card using CMD6 mode 1. As per Host Controller spec v3.00, we set driver type for the host only if Preset Value Enable in the Host Control2 register is not set. SDHCI_HOST_CONTROL has been renamed to SDHCI_HOST_CONTROL1 to conform to the spec. Tested by Zhangfei Gao with a Toshiba uhs card and general hs card, on mmp2 in SDMA mode. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Reviewed-by: Philip Rakity <prakity@marvell.com> Tested-by: Philip Rakity <prakity@marvell.com> Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-05-05 06:48:59 +00:00
void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type);
mmc: core: Factor out common code in drive strength selection Make a new function out of common code used for drive strength selection. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-02-06 12:12:55 +00:00
int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
int card_drv_type, int *drv_type);
mmc: core: Let mmc_power_up|cycle take ocr as parameter As a step to fixup the setup of the negotiated ocr mask, we need the mmc_power_up|cycle functions to take the ocr as a parameter. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-09-12 12:36:53 +00:00
void mmc_power_up(struct mmc_host *host, u32 ocr);
mmc: core: Fix hangs related to insert/remove of cards During a rescan operation mmc_attach(sd|mmc|sdio) functions are called. The error handling in these function can trigger a detach of the bus, which also meant a power off. This is not notified by the rescan operation which then continues to the next attach function. If a power off has been done, the framework must never send any new commands to the host driver, without first doing a new power up. This will most likely trigger any host driver to hang. Moving power off out of detach and instead handle power off separately when it is actually needed, solves the issue. Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Cc: <stable@kernel.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-09-21 18:08:13 +00:00
void mmc_power_off(struct mmc_host *host);
mmc: core: Let mmc_power_up|cycle take ocr as parameter As a step to fixup the setup of the negotiated ocr mask, we need the mmc_power_up|cycle functions to take the ocr as a parameter. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-09-12 12:36:53 +00:00
void mmc_power_cycle(struct mmc_host *host, u32 ocr);
mmc: core: consistent handling of initial values mmc_do_hw_reset(), mmc_power_up() and mmc_power_off() all set similar initial values for bus_mode, bus_width, chip_select and timing. Let's make this handling simpler and more consistent by sticking them together in a common function. This will introduce small changes in behavior in the following places: mmc_power_off(): For SPI hosts, explicitly set bus_mode = MMC_BUSMODE_PUSHPULL and chip_select = MMC_CS_HIGH, before we left them as they were. For non-SPI hosts, set bus_mode = MMC_BUSMODE_PUSHPULL instead of MMC_BUSMODE_OPENDRAIN as before. These two changes should not be a problem since the device will be powered off anyway. mmc_do_hw_reset(): Always set bus_mode = MMC_BUSMODE_PUSHPULL, as required by SD/SDIO cards. MMC cards require MMC_BUSMODE_OPENDRAIN, but this is taken care of by mmc_init_card() and mmc_attach_mmc(). Signed-off-by: Johan Rudholm <johanru@axis.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-11-06 13:46:54 +00:00
void mmc_set_initial_state(struct mmc_host *host);
mmc: add bus handler Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-30 23:11:32 +00:00
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
static inline void mmc_delay(unsigned int ms)
{
if (ms < 1000 / HZ) {
cond_resched();
mdelay(ms);
} else {
msleep(ms);
}
}
[PATCH] mmc: use own work queue The MMC layer uses the standard work queue for doing card detection. As this queue is shared with other crucial subsystems, the effects of a long (and perhaps buggy) detection can cause the system to be unusable. E.g. the keyboard stops working while the detection routine is running. The solution is to add a specific mmc work queue to run the detection code in. This is similar to how other subsystems handle detection (a full kernel thread is the most common theme). Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-04 09:15:41 +00:00
mmc: refactor host class handling Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-05-19 12:06:24 +00:00
void mmc_rescan(struct work_struct *work);
void mmc_start_host(struct mmc_host *host);
void mmc_stop_host(struct mmc_host *host);
mmc: allow upper layers to know immediately if card has been removed Add a function mmc_detect_card_removed() which upper layers can use to determine immediately if a card has been removed. This function should be called after an I/O request fails so that all queued I/O requests can be errored out immediately instead of waiting for the card device to be removed. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Sujit Reddy Thumma <sthumma@codeaurora.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-11-28 14:22:00 +00:00
int _mmc_detect_card_removed(struct mmc_host *host);
mmc: core: Move public functions from core.h to private headers A significant amount of functions are available through the public mmc core.h header file. Let's slim down this public mmc interface, as to prevent users from abusing it, by moving some of the functions to private mmc header files. This change concentrates on moving the functions into private mmc headers, following changes may continue with additional clean-ups, as an example some functions can be turned into static. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
2017-01-13 13:14:08 +00:00
int mmc_detect_card_removed(struct mmc_host *host);
mmc: allow upper layers to know immediately if card has been removed Add a function mmc_detect_card_removed() which upper layers can use to determine immediately if a card has been removed. This function should be called after an I/O request fails so that all queued I/O requests can be errored out immediately instead of waiting for the card device to be removed. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Sujit Reddy Thumma <sthumma@codeaurora.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-11-28 14:22:00 +00:00
mmc: Fix sd/sdio/mmc initialization frequency retries Rewrite and clean up mmc_rescan() to properly retry frequencies lower than 400kHz. Failures can happen both in sd_send_* calls and mmc_attach_*. Break out "mmc_rescan_try_freq" from the frequency selection loop. Symmetrize claim/release logic in mmc_attach_* API, and move the sd_send_* calls there to make mmc_rescan easier to read. Signed-off-by: Andy Ross <andy.ross@windriver.com> Reviewed-and-Tested-by: Hein Tibosch <hein_tibosch@yahoo.es> Reviewed-by: Chris Ball <cjb@laptop.org> Signed-off-by: Chris Ball <cjb@laptop.org>
2011-01-03 18:36:56 +00:00
int mmc_attach_mmc(struct mmc_host *host);
int mmc_attach_sd(struct mmc_host *host);
int mmc_attach_sdio(struct mmc_host *host);
mmc: proper prototypes for mmc_attach_*() This patch adds proper prototypes for mmc_attach_*() in drivers/mmc/core/core.h Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-04-13 18:15:50 +00:00
mmc: add module parameter to set whether cards are assumed removable Some people run general-purpose distribution kernels on netbooks with a card that is physically non-removable or logically non-removable (e.g. used for /home) and cannot be cleanly unmounted during suspend. Add a module parameter to set whether cards are assumed removable or non-removable, with the default set by CONFIG_MMC_UNSAFE_RESUME. In general, it is not possible to tell whether a card present in an MMC slot after resume is the same that was there before suspend. So there are two possible behaviours, each of which will cause data loss in some cases: CONFIG_MMC_UNSAFE_RESUME=n (default): Cards are assumed to be removed during suspend. Any filesystem on them must be unmounted before suspend; otherwise, buffered writes will be lost. CONFIG_MMC_UNSAFE_RESUME=y: Cards are assumed to remain present during suspend. They must not be swapped during suspend; otherwise, buffered writes will be flushed to the wrong card. Currently the choice is made at compile time and this allows that to be overridden at module load time. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Wouter van Heyst <larstiq@larstiq.dyndns.org> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-15 02:01:29 +00:00
/* Module parameters */
module_param: make bool parameters really bool (drivers & misc) module_param(bool) used to counter-intuitively take an int. In fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy trick. It's time to remove the int/unsigned int option. For this version it'll simply give a warning, but it'll break next kernel version. Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-01-12 23:02:20 +00:00
extern bool use_spi_crc;
MMC core learns about SPI Teach the MMC/SD/SDIO core about using SPI mode. - Use mmc_host_is_spi() so enumeration works through SPI signaling and protocols, not just the native versions. - Provide the SPI response type flags with each request issued, including requests from the new lock/unlock code. - Understand that cmd->resp[0] and mmc_get_status() results for SPI return different values than for "native" MMC/SD protocol; this affects resetting, checking card lock status, and some others. - Understand that some commands act a bit differently ... notably: * OP_COND command doesn't return the OCR * APP_CMD status doesn't have an R1_APP_CMD analogue Those changes required some new and updated primitives: - Provide utilities to access two SPI-only requests, and one request that wasn't previously needed: * mmc_spi_read_ocr() ... SPI only * mmc_spi_set_crc() ... SPI only (override by module parm) * mmc_send_cid() ... for use without broadcast mode - Updated internal routines: * Previous mmc_send_csd() modified into mmc_send_cxd_native(); it uses native "R2" responses, which include 16 bytes of data. * Previous mmc_send_ext_csd() becomes new mmc_send_cxd_data() helper for command-and-data access * Bugfix to that mmc_send_cxd_data() code: dma-to-stack is unsafe/nonportable, so kmalloc a bounce buffer instead. - Modified mmc_send_ext_csd() now uses mmc_send_cxd_data() helper - Modified mmc_send_csd(), and new mmc_spi_send_cid(), routines use those helper routines based on whether they're native or SPI The newest categories of cards supported by the MMC stack aren't expected to work yet with SPI: MMC or SD cards with over 4GB data, and SDIO. All those cards support SPI mode, so eventually they should work too. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2007-08-08 16:11:32 +00:00
mmc: Export internal host state through debugfs When CONFIG_DEBUG_FS is set, create a few files under /sys/kernel/debug containing information about an mmc host's internal state. Currently, just a single file is created, "ios", which contains information about the current operating parameters for the bus (clock speed, bus width, etc.) Host drivers can add additional files and directories under the host's root directory by passing the debugfs_root field in struct mmc_host as the 'parent' parameter to debugfs_create_*. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-07-24 12:18:57 +00:00
/* Debugfs information for hosts and cards */
void mmc_add_host_debugfs(struct mmc_host *host);
void mmc_remove_host_debugfs(struct mmc_host *host);
mmc: Add per-card debugfs support For each card successfully added to the bus, create a subdirectory under the host's debugfs root with information about the card. At the moment, only a single file is added to the card directory for all cards: "state". It reflects the "state" field in struct mmc_card, indicating whether the card is present, readonly, etc. For MMC and SD cards (not SDIO), another file is added: "status". Reading this file will ask the card about its current status and return it. This can be useful if the card just refuses to respond to any commands, which might indicate that the card state is not what the MMC core thinks it is (due to a missing stop command, for example.) Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2008-07-24 12:18:58 +00:00
void mmc_add_card_debugfs(struct mmc_card *card);
void mmc_remove_card_debugfs(struct mmc_card *card);
mmc: fix async request mechanism for sequential read scenarios When current request is running on the bus and if next request fetched by mmcqd is NULL, mmc context (mmcqd thread) gets blocked until the current request completes. This means that if new request comes in while the mmcqd thread is blocked, this new request can not be prepared in parallel to current ongoing request. This may result in delaying the new request execution and increase it's latency. This change allows to wake up the MMC thread on new request arrival. Now once the MMC thread is woken up, a new request can be fetched and prepared in parallel to the current running request which means this new request can be started immediately after the current running request completes. With this change read throughput is improved by 16%. Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org> Reviewed-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2013-01-14 19:28:17 +00:00
void mmc_init_context_info(struct mmc_host *host);
mmc: core: Simplify by adding mmc_execute_tuning() For each MMC, SD and SDIO there is code that holds the clock, calls ops->execute_tuning, and releases the clock. Simplify the code a bit by providing a separate function to do that. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-05 17:40:59 +00:00
int mmc_execute_tuning(struct mmc_card *card);
mmc: core: Add support for HS400 re-tuning HS400 re-tuning must be done in HS200 mode. Add the ability to switch from HS400 mode to HS200 mode before re-tuning and switch back to HS400 after re-tuning. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-05-07 10:10:20 +00:00
int mmc_hs200_to_hs400(struct mmc_card *card);
int mmc_hs400_to_hs200(struct mmc_card *card);
mmc: core: Simplify by adding mmc_execute_tuning() For each MMC, SD and SDIO there is code that holds the clock, calls ops->execute_tuning, and releases the clock. Simplify the code a bit by providing a separate function to do that. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2014-12-05 17:40:59 +00:00
mmc: core: Refactor code to register the MMC PM notifier Instead of checking for "#ifdef" directly in the code, let's invent a pair of mmc core functions to deal with register/unregister the MMC PM notifier block. Implement stubs for these functions when CONFIG_PM_SLEEP is unset, as in that case the PM notifiers isn't used. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-11-05 15:11:12 +00:00
#ifdef CONFIG_PM_SLEEP
void mmc_register_pm_notifier(struct mmc_host *host);
void mmc_unregister_pm_notifier(struct mmc_host *host);
#else
mmc: fix mmc_{un,}register_pm_notifier prototypes The mmc pm notifiers were recently reworked, but the new code produces a lot of warnings when CONFIG_PM_SLEEP is disabled: In file included from ../drivers/mmc/core/sdio_bus.c:27:0: drivers/mmc/core/core.h:97:13: warning: 'mmc_register_pm_notifier' defined but not used [-Wunused-function] The obvious solution is to add the 'inline' keyword at the function definition, as it should be for any function defined in a header file. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 0e40be7c20e0 ("mmc: core: Refactor code to register the MMC PM notifier") Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-11-20 10:28:42 +00:00
static inline void mmc_register_pm_notifier(struct mmc_host *host) { }
static inline void mmc_unregister_pm_notifier(struct mmc_host *host) { }
mmc: core: Refactor code to register the MMC PM notifier Instead of checking for "#ifdef" directly in the code, let's invent a pair of mmc core functions to deal with register/unregister the MMC PM notifier block. Implement stubs for these functions when CONFIG_PM_SLEEP is unset, as in that case the PM notifiers isn't used. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-11-05 15:11:12 +00:00
#endif
mmc: core: Move public functions from core.h to private headers A significant amount of functions are available through the public mmc core.h header file. Let's slim down this public mmc interface, as to prevent users from abusing it, by moving some of the functions to private mmc header files. This change concentrates on moving the functions into private mmc headers, following changes may continue with additional clean-ups, as an example some functions can be turned into static. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
2017-01-13 13:14:08 +00:00
void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq);
bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq);
int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
unsigned int arg);
int mmc_can_erase(struct mmc_card *card);
int mmc_can_trim(struct mmc_card *card);
int mmc_can_discard(struct mmc_card *card);
int mmc_can_sanitize(struct mmc_card *card);
int mmc_can_secure_erase_trim(struct mmc_card *card);
int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
unsigned int nr);
unsigned int mmc_calc_max_discard(struct mmc_card *card);
int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen);
int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
bool is_rel_write);
int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
void mmc_release_host(struct mmc_host *host);
void mmc_get_card(struct mmc_card *card);
void mmc_put_card(struct mmc_card *card);
/**
* mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
*
* Claim a host for a set of operations.
*/
static inline void mmc_claim_host(struct mmc_host *host)
{
__mmc_claim_host(host, NULL);
}
mmc: Separate out protocol ops Move protocol operations and definitions into their own files in an effort to separate protocol handling and bus arbitration more clearly. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
2006-12-24 21:46:55 +00:00
mmc: core: Move public functions from core.h to private headers A significant amount of functions are available through the public mmc core.h header file. Let's slim down this public mmc interface, as to prevent users from abusing it, by moving some of the functions to private mmc header files. This change concentrates on moving the functions into private mmc headers, following changes may continue with additional clean-ups, as an example some functions can be turned into static. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
2017-01-13 13:14:08 +00:00
#endif
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