forked from Minki/linux
9eadcc0581
MMC_CLKGATE was once invented to save power by gating the bus clock at request inactivity. At that time it served its purpose. The modern way to deal with power saving for these scenarios, is by using runtime PM. Nowadays, several host drivers have deployed runtime PM, but for those that haven't and which still cares power saving at request inactivity, it's certainly time to deploy runtime PM as it has been around for several years now. To simplify code to mmc core and thus decrease maintenance efforts, this patch removes all code related to MMC_CLKGATE. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
400 lines
8.3 KiB
C
400 lines
8.3 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 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->chip_select, 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 > host->f_max)
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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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