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