/* * 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 <linux/debugfs.h> #include <linux/fs.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h> #include "core.h" #include "mmc_ops.h" /* 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); 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; default: str = "invalid"; break; } seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); return 0; } static int mmc_ios_open(struct inode *inode, struct file *file) { return single_open(file, mmc_ios_show, inode->i_private); } static const struct file_operations mmc_ios_fops = { .open = mmc_ios_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; 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 > host->f_max) 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_MMC_CLKGATE if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR), root, &host->clk_delay)) 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); } static int mmc_dbg_card_status_get(void *data, u64 *val) { struct mmc_card *card = data; u32 status; int ret; mmc_claim_host(card->host); ret = mmc_send_status(data, &status); if (!ret) *val = status; mmc_release_host(card->host); return ret; } DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, NULL, "%08llx\n"); #define EXT_CSD_STR_LEN 1025 static int mmc_ext_csd_open(struct inode *inode, struct file *filp) { struct mmc_card *card = inode->i_private; char *buf; ssize_t n = 0; u8 *ext_csd; int err, i; buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); if (!buf) return -ENOMEM; ext_csd = kmalloc(512, GFP_KERNEL); if (!ext_csd) { err = -ENOMEM; goto out_free; } mmc_claim_host(card->host); err = mmc_send_ext_csd(card, ext_csd); mmc_release_host(card->host); if (err) goto out_free; for (i = 511; i >= 0; i--) n += sprintf(buf + n, "%02x", ext_csd[i]); n += sprintf(buf + n, "\n"); BUG_ON(n != EXT_CSD_STR_LEN); filp->private_data = buf; kfree(ext_csd); return 0; out_free: kfree(buf); kfree(ext_csd); return err; } static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { char *buf = filp->private_data; return simple_read_from_buffer(ubuf, cnt, ppos, buf, EXT_CSD_STR_LEN); } static int mmc_ext_csd_release(struct inode *inode, struct file *file) { kfree(file->private_data); return 0; } static const struct file_operations mmc_dbg_ext_csd_fops = { .open = mmc_ext_csd_open, .read = mmc_ext_csd_read, .release = mmc_ext_csd_release, .llseek = default_llseek, }; 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; if (mmc_card_mmc(card) || mmc_card_sd(card)) if (!debugfs_create_file("status", S_IRUSR, root, card, &mmc_dbg_card_status_fops)) goto err; if (mmc_card_mmc(card)) if (!debugfs_create_file("ext_csd", S_IRUSR, root, card, &mmc_dbg_ext_csd_fops)) 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); }