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linux/drivers/mmc/core/debugfs.c
Vincent Whitchurch ff369d7b98 mmc: debugfs: Allow host caps to be modified 
During board verification, there is a need to test the various supported
eMMC/SD speed modes.  However, since the framework chooses the best mode
supported by the card and the host controller's caps, this currently
necessitates changing the devicetree for every iteration.

Allow the various speed mode host capabilities to be modified via
debugfs in order to allow easier hardware verification.  The values to
be written are the raw MMC_CAP* values from include/linux/mmc/host.h.
This is rather low-level, and these defines are not guaranteed to be
stable, but it is perhaps good enough for the intended use case.

MMC_CAP_AGGRESSIVE_PM can also be set, in order to be able to
re-initialize the card without having to physically remove and re-insert
it.

 /sys/kernel/debug/mmc0# grep timing ios
 timing spec:	9 (mmc HS200)

 // Turn on MMC_CAP_AGGRESSIVE_PM and re-trigger runtime suspend
 /sys/kernel/debug/mmc0# echo $(($(cat caps) | (1 << 7))) > caps
 /sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
 /sys/kernel/debug/mmc0# echo auto > /sys/bus/mmc/devices/mmc0\:0001/power/control

 // MMC_CAP2_HS200_1_8V_SDR
 /sys/kernel/debug/mmc0# echo $(($(cat caps2) & ~(1 << 5))) > caps2
 /sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
 /sys/kernel/debug/mmc0# grep timing ios
 timing spec:	8 (mmc DDR52)

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20230929-mmc-caps-v2-2-11a4c2d94f15@axis.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2023-10-10 13:44:49 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Debugfs support for hosts and cards
*
* Copyright (C) 2008 Atmel Corporation
*/
#include <linux/moduleparam.h>
#include <linux/export.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/fault-inject.h>
#include <linux/time.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include "core.h"
#include "card.h"
#include "host.h"
#include "mmc_ops.h"
#ifdef CONFIG_FAIL_MMC_REQUEST
static DECLARE_FAULT_ATTR(fail_default_attr);
static char *fail_request;
module_param(fail_request, charp, 0);
MODULE_PARM_DESC(fail_request, "default fault injection attributes");
#endif /* CONFIG_FAIL_MMC_REQUEST */
/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
static int mmc_ios_show(struct seq_file *s, void *data)
{
static const char *vdd_str[] = {
[8] = "2.0",
[9] = "2.1",
[10] = "2.2",
[11] = "2.3",
[12] = "2.4",
[13] = "2.5",
[14] = "2.6",
[15] = "2.7",
[16] = "2.8",
[17] = "2.9",
[18] = "3.0",
[19] = "3.1",
[20] = "3.2",
[21] = "3.3",
[22] = "3.4",
[23] = "3.5",
[24] = "3.6",
};
struct mmc_host *host = s->private;
struct mmc_ios *ios = &host->ios;
const char *str;
seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
if (host->actual_clock)
seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
seq_printf(s, "vdd:\t\t%u ", ios->vdd);
if ((1 << ios->vdd) & MMC_VDD_165_195)
seq_printf(s, "(1.65 - 1.95 V)\n");
else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
vdd_str[ios->vdd + 1]);
else
seq_printf(s, "(invalid)\n");
switch (ios->bus_mode) {
case MMC_BUSMODE_OPENDRAIN:
str = "open drain";
break;
case MMC_BUSMODE_PUSHPULL:
str = "push-pull";
break;
default:
str = "invalid";
break;
}
seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
switch (ios->chip_select) {
case MMC_CS_DONTCARE:
str = "don't care";
break;
case MMC_CS_HIGH:
str = "active high";
break;
case MMC_CS_LOW:
str = "active low";
break;
default:
str = "invalid";
break;
}
seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
switch (ios->power_mode) {
case MMC_POWER_OFF:
str = "off";
break;
case MMC_POWER_UP:
str = "up";
break;
case MMC_POWER_ON:
str = "on";
break;
default:
str = "invalid";
break;
}
seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
seq_printf(s, "bus width:\t%u (%u bits)\n",
ios->bus_width, 1 << ios->bus_width);
switch (ios->timing) {
case MMC_TIMING_LEGACY:
str = "legacy";
break;
case MMC_TIMING_MMC_HS:
str = "mmc high-speed";
break;
case MMC_TIMING_SD_HS:
str = "sd high-speed";
break;
case MMC_TIMING_UHS_SDR12:
str = "sd uhs SDR12";
break;
case MMC_TIMING_UHS_SDR25:
str = "sd uhs SDR25";
break;
case MMC_TIMING_UHS_SDR50:
str = "sd uhs SDR50";
break;
case MMC_TIMING_UHS_SDR104:
str = "sd uhs SDR104";
break;
case MMC_TIMING_UHS_DDR50:
str = "sd uhs DDR50";
break;
case MMC_TIMING_MMC_DDR52:
str = "mmc DDR52";
break;
case MMC_TIMING_MMC_HS200:
str = "mmc HS200";
break;
case MMC_TIMING_MMC_HS400:
str = mmc_card_hs400es(host->card) ?
"mmc HS400 enhanced strobe" : "mmc HS400";
break;
default:
str = "invalid";
break;
}
seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_330:
str = "3.30 V";
break;
case MMC_SIGNAL_VOLTAGE_180:
str = "1.80 V";
break;
case MMC_SIGNAL_VOLTAGE_120:
str = "1.20 V";
break;
default:
str = "invalid";
break;
}
seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
switch (ios->drv_type) {
case MMC_SET_DRIVER_TYPE_A:
str = "driver type A";
break;
case MMC_SET_DRIVER_TYPE_B:
str = "driver type B";
break;
case MMC_SET_DRIVER_TYPE_C:
str = "driver type C";
break;
case MMC_SET_DRIVER_TYPE_D:
str = "driver type D";
break;
default:
str = "invalid";
break;
}
seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(mmc_ios);
static int mmc_clock_opt_get(void *data, u64 *val)
{
struct mmc_host *host = data;
*val = host->ios.clock;
return 0;
}
static int mmc_clock_opt_set(void *data, u64 val)
{
struct mmc_host *host = data;
/* We need this check due to input value is u64 */
if (val != 0 && (val > host->f_max || val < host->f_min))
return -EINVAL;
mmc_claim_host(host);
mmc_set_clock(host, (unsigned int) val);
mmc_release_host(host);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
"%llu\n");
static int mmc_err_state_get(void *data, u64 *val)
{
struct mmc_host *host = data;
int i;
if (!host)
return -EINVAL;
*val = 0;
for (i = 0; i < MMC_ERR_MAX; i++) {
if (host->err_stats[i]) {
*val = 1;
break;
}
}
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
static int mmc_err_stats_show(struct seq_file *file, void *data)
{
struct mmc_host *host = file->private;
const char *desc[MMC_ERR_MAX] = {
[MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
[MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",
[MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",
[MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",
[MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",
[MMC_ERR_ADMA] = "ADMA Error Occurred",
[MMC_ERR_TUNING] = "Tuning Error Occurred",
[MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",
[MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",
[MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",
[MMC_ERR_REQ_TIMEOUT] = "Request Timedout",
[MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",
[MMC_ERR_ICE_CFG] = "ICE Config Errors",
[MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",
[MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",
};
int i;
for (i = 0; i < MMC_ERR_MAX; i++) {
if (desc[i])
seq_printf(file, "# %s:\t %d\n",
desc[i], host->err_stats[i]);
}
return 0;
}
static int mmc_err_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, mmc_err_stats_show, inode->i_private);
}
static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct mmc_host *host = filp->f_mapping->host->i_private;
pr_debug("%s: Resetting MMC error statistics\n", __func__);
memset(host->err_stats, 0, sizeof(host->err_stats));
return cnt;
}
static const struct file_operations mmc_err_stats_fops = {
.open = mmc_err_stats_open,
.read = seq_read,
.write = mmc_err_stats_write,
.release = single_release,
};
static int mmc_caps_get(void *data, u64 *val)
{
*val = *(u32 *)data;
return 0;
}
static int mmc_caps_set(void *data, u64 val)
{
u32 *caps = data;
u32 diff = *caps ^ val;
u32 allowed = MMC_CAP_AGGRESSIVE_PM |
MMC_CAP_SD_HIGHSPEED |
MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_UHS |
MMC_CAP_DDR;
if (diff & ~allowed)
return -EINVAL;
*caps = val;
return 0;
}
static int mmc_caps2_set(void *data, u64 val)
{
u32 allowed = MMC_CAP2_HSX00_1_8V | MMC_CAP2_HSX00_1_2V;
u32 *caps = data;
u32 diff = *caps ^ val;
if (diff & ~allowed)
return -EINVAL;
*caps = val;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps_fops, mmc_caps_get, mmc_caps_set,
"0x%08llx\n");
DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps2_fops, mmc_caps_get, mmc_caps2_set,
"0x%08llx\n");
void mmc_add_host_debugfs(struct mmc_host *host)
{
struct dentry *root;
root = debugfs_create_dir(mmc_hostname(host), NULL);
host->debugfs_root = root;
debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops);
debugfs_create_file("caps", 0600, root, &host->caps, &mmc_caps_fops);
debugfs_create_file("caps2", 0600, root, &host->caps2,
&mmc_caps2_fops);
debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
&mmc_clock_fops);
debugfs_create_file_unsafe("err_state", 0600, root, host,
&mmc_err_state);
debugfs_create_file("err_stats", 0600, root, host,
&mmc_err_stats_fops);
#ifdef CONFIG_FAIL_MMC_REQUEST
if (fail_request)
setup_fault_attr(&fail_default_attr, fail_request);
host->fail_mmc_request = fail_default_attr;
fault_create_debugfs_attr("fail_mmc_request", root,
&host->fail_mmc_request);
#endif
}
void mmc_remove_host_debugfs(struct mmc_host *host)
{
debugfs_remove_recursive(host->debugfs_root);
}
void mmc_add_card_debugfs(struct mmc_card *card)
{
struct mmc_host *host = card->host;
struct dentry *root;
if (!host->debugfs_root)
return;
root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
card->debugfs_root = root;
debugfs_create_x32("state", S_IRUSR, root, &card->state);
}
void mmc_remove_card_debugfs(struct mmc_card *card)
{
debugfs_remove_recursive(card->debugfs_root);
card->debugfs_root = NULL;
}
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