| /* |
| * 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/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/mmc/card.h> |
| #include <linux/mmc/host.h> |
| |
| #include "core.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_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_HS200: |
| str = "mmc high-speed SDR200"; |
| 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 |
| #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); |
| } |
| |
| 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); |
| } |