// 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" , 0400, 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" , 0600, 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" , 0400, root, &card->state);
debugfs_create_x32("quirks" , 0400, root, &card->quirks);
}
void mmc_remove_card_debugfs(struct mmc_card *card)
{
debugfs_remove_recursive(card->debugfs_root);
card->debugfs_root = NULL;
}
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