401 lines
8.4 KiB
C
401 lines
8.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 "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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#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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static int mmc_ios_open(struct inode *inode, struct file *file)
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{
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return single_open(file, mmc_ios_show, inode->i_private);
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}
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static const struct file_operations mmc_ios_fops = {
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.open = mmc_ios_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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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_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
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"%llu\n");
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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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if (IS_ERR(root))
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/* Don't complain -- debugfs just isn't enabled */
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return;
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if (!root)
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/* Complain -- debugfs is enabled, but it failed to
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* create the directory. */
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goto err_root;
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host->debugfs_root = root;
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if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
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goto err_node;
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if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
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&mmc_clock_fops))
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goto err_node;
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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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if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
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root,
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&host->fail_mmc_request)))
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goto err_node;
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#endif
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return;
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err_node:
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debugfs_remove_recursive(root);
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host->debugfs_root = NULL;
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err_root:
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dev_err(&host->class_dev, "failed to initialize debugfs\n");
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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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static int mmc_dbg_card_status_get(void *data, u64 *val)
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{
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struct mmc_card *card = data;
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u32 status;
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int ret;
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mmc_get_card(card);
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ret = mmc_send_status(data, &status);
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if (!ret)
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*val = status;
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mmc_put_card(card);
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return ret;
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}
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DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
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NULL, "%08llx\n");
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#define EXT_CSD_STR_LEN 1025
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static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
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{
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struct mmc_card *card = inode->i_private;
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char *buf;
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ssize_t n = 0;
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u8 *ext_csd;
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int err, i;
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buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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mmc_get_card(card);
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err = mmc_get_ext_csd(card, &ext_csd);
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mmc_put_card(card);
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if (err)
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goto out_free;
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for (i = 0; i < 512; i++)
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n += sprintf(buf + n, "%02x", ext_csd[i]);
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n += sprintf(buf + n, "\n");
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BUG_ON(n != EXT_CSD_STR_LEN);
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filp->private_data = buf;
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kfree(ext_csd);
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return 0;
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out_free:
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kfree(buf);
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return err;
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}
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static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char *buf = filp->private_data;
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return simple_read_from_buffer(ubuf, cnt, ppos,
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buf, EXT_CSD_STR_LEN);
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}
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static int mmc_ext_csd_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static const struct file_operations mmc_dbg_ext_csd_fops = {
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.open = mmc_ext_csd_open,
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.read = mmc_ext_csd_read,
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.release = mmc_ext_csd_release,
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.llseek = default_llseek,
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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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if (IS_ERR(root))
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/* Don't complain -- debugfs just isn't enabled */
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return;
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if (!root)
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/* Complain -- debugfs is enabled, but it failed to
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* create the directory. */
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goto err;
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card->debugfs_root = root;
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if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
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goto err;
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if (mmc_card_mmc(card) || mmc_card_sd(card))
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if (!debugfs_create_file("status", S_IRUSR, root, card,
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&mmc_dbg_card_status_fops))
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goto err;
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if (mmc_card_mmc(card))
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if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
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&mmc_dbg_ext_csd_fops))
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goto err;
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return;
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err:
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debugfs_remove_recursive(root);
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card->debugfs_root = NULL;
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dev_err(&card->dev, "failed to initialize debugfs\n");
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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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}
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