/* * Debugfs support for hosts and cards * * Copyright (C) 2008 Atmel Corporation * * 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. */ #include #include #include #include #include #include #include #include #include #include #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); #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_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, "%llu\n"); void mmc_add_host_debugfs(struct mmc_host *host) { struct dentry *root; root = debugfs_create_dir(mmc_hostname(host), NULL); if (IS_ERR(root)) /* Don't complain -- debugfs just isn't enabled */ return; if (!root) /* Complain -- debugfs is enabled, but it failed to * create the directory. */ goto err_root; host->debugfs_root = root; if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) goto err_node; if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, &mmc_clock_fops)) goto err_node; #ifdef CONFIG_FAIL_MMC_REQUEST if (fail_request) setup_fault_attr(&fail_default_attr, fail_request); host->fail_mmc_request = fail_default_attr; if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", root, &host->fail_mmc_request))) goto err_node; #endif return; err_node: debugfs_remove_recursive(root); host->debugfs_root = NULL; err_root: dev_err(&host->class_dev, "failed to initialize debugfs\n"); } 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); if (IS_ERR(root)) /* Don't complain -- debugfs just isn't enabled */ return; if (!root) /* Complain -- debugfs is enabled, but it failed to * create the directory. */ goto err; card->debugfs_root = root; if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) goto err; return; err: debugfs_remove_recursive(root); card->debugfs_root = NULL; dev_err(&card->dev, "failed to initialize debugfs\n"); } void mmc_remove_card_debugfs(struct mmc_card *card) { debugfs_remove_recursive(card->debugfs_root); card->debugfs_root = NULL; }