This patch exports the host capabilities to debugfs This idea of sharing host capabilities over debugfs came up from Abbas Raza <Abbas_Raza@xxxxxxxxxx> Earlier discussions: https://lkml.org/lkml/2018/3/5/357 https://www.spinics.net/lists/linux-mmc/msg48219.html Signed-off-by: Harish Jenny K N <harish_kandiga@xxxxxxxxxx> --- Changes in v8 - Changes to use for_each_set_bit as suggested by Andy Shevchenko. Changes in v7 - Moved additional capabilities also to caps file as mentioned by Ulf Hansson - compacting the code with macros Changes in v6: - Used DEFINE_SHOW_ATTRIBUTE Changes in v5: - Added parser logic in kernel by using debugfs_create_file for caps and caps2 instead of debugfs_create_x32 - Changed Author Changes in v4: - Moved the creation of nodes to mmc_add_host_debugfs - Exported caps2 - Renamed host_caps to caps Changes in v3: - Removed typecasting of &host->caps to (u32 *) Changes in v2: - Changed Author drivers/mmc/core/debugfs.c | 111 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c index c51e0c0..a16846b 100644 --- a/drivers/mmc/core/debugfs.c +++ b/drivers/mmc/core/debugfs.c @@ -225,6 +225,114 @@ static int mmc_clock_opt_set(void *data, u64 val) DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, "%llu\n"); +static int mmc_caps_show(struct seq_file *s, void *unused) +{ + static const char * const mmc_host_capabilities[] = { + "4-bit transfers allowed",/* MMC_CAP_4_BIT_DATA (1 << 0) */ + /* MMC_CAP_MMC_HIGHSPEED (1 << 1)*/ + "Supports MMC high-speed timing", + /* MMC_CAP_SD_HIGHSPEED (1 << 2)*/ + "Supports SD high-speed timing", + "Can signal pending SDIO IRQs",/* MMC_CAP_SDIO_IRQ (1 << 3) */ + "Talks only SPI protocols",/* MMC_CAP_SPI (1 << 4) */ + /* MMC_CAP_NEEDS_POLL (1 << 5)*/ + "Needs polling for card-detection", + "8 bit transfers allowed",/* MMC_CAP_8_BIT_DATA (1 << 6) */ + "Suspends (e)MMC/SD at idle",/*MMC_CAP_AGGRESSIVE_PM (1 << 7)*/ + "Nonremovable",/* MMC_CAP_NONREMOVABLE (1 << 8) */ + "Waits while card is busy",/*MMC_CAP_WAIT_WHILE_BUSY (1 << 9)*/ + "Allows erase/trim commands",/* MMC_CAP_ERASE (1 << 10) */ + "Supports DDR mode at 3.3V",/* MMC_CAP_3_3V_DDR (1 << 11) */ + "Supports DDR mode at 1.8V",/* MMC_CAP_1_8V_DDR (1 << 12) */ + "Supports DDR mode at 1.2V",/* MMC_CAP_1_2V_DDR (1 << 13) */ + "Can power off after boot",/*MMC_CAP_POWER_OFF_CARD (1 << 14)*/ + "CMD14/CMD19 bus width ok",/*MMC_CAP_BUS_WIDTH_TEST (1 << 15)*/ + "Supports UHS SDR12 mode",/* MMC_CAP_UHS_SDR12 (1 << 16) */ + "Supports UHS SDR25 mode",/* MMC_CAP_UHS_SDR25 (1 << 17) */ + "Supports UHS SDR50 mode",/* MMC_CAP_UHS_SDR50 (1 << 18) */ + "Supports UHS SDR104 mode",/* MMC_CAP_UHS_SDR104 (1 << 19) */ + "Supports UHS DDR50 mode",/* MMC_CAP_UHS_DDR50 (1 << 20) */ + "",/* (1 << 21) is free for reuse*/ + "",/* (1 << 22) */ + "Supports Driver Type A",/* MMC_CAP_DRIVER_TYPE_A (1 << 23) */ + "Supports Driver Type C",/* MMC_CAP_DRIVER_TYPE_C (1 << 24) */ + "Supports Driver Type D",/* MMC_CAP_DRIVER_TYPE_D (1 << 25) */ + "",/* (1 << 26) */ + /* MMC_CAP_DONE_COMPLETE (1 << 27) */ + "RW reqs can be completed within mmc_request_done()", + "Supports Enable card detect wake",/*MMC_CAP_CD_WAKE (1 << 28)*/ + /* MMC_CAP_CMD_DURING_TFR (1 << 29) */ + "Can send commands during data transfer", + "CMD23 supported",/* MMC_CAP_CMD23 (1 << 30) */ + "Supports Hardware reset"/* MMC_CAP_HW_RESET (1 << 31) */ + }; + + static const char * const mmc_host_capabilities2[] = { + /* MMC_CAP2_BOOTPART_NOACC (1 << 0) */ + "No access to Boot partition", + "",/* (1 << 1) */ + "Can do full power cycle",/* MMC_CAP2_FULL_PWR_CYCLE (1 << 2) */ + "",/* (1 << 3) */ + "",/* (1 << 4) */ + "Supports HS200 1.8V SDR",/* MMC_CAP2_HS200_1_8V_SDR (1 << 5) */ + "Supports HS200 1.2V SDR",/* MMC_CAP2_HS200_1_2V_SDR (1 << 6) */ + "",/* (1 << 7) */ + "",/* (1 << 8) */ + "",/* (1 << 9) */ + /* MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) */ + "Card-detect signal active high", + /* MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) */ + "Write-protect signal active high", + "",/* (1 << 12) */ + "",/* (1 << 13) */ + /* MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) */ + "Can do complete power cycle of the card", + "Supports HS400 1.8V",/* MMC_CAP2_HS400_1_8V (1 << 15) */ + "Support HS400 1.2V",/* MMC_CAP2_HS400_1_2V (1 << 16) */ + "SDIO IRQ - Nothread",/* MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17) */ + /* MMC_CAP2_NO_WRITE_PROTECT (1 << 18) */ + "No physical write protect pin, assume always read-write", + /* MMC_CAP2_NO_SDIO (1 << 19) */ + "Do not send SDIO commands during initialization", + "Supports enhanced strobe",/* MMC_CAP2_HS400_ES (1 << 20) */ + /* MMC_CAP2_NO_SD (1 << 21) */ + "Do not send SD commands during initialization", + /* MMC_CAP2_NO_MMC (1 << 22) */ + "Do not send (e)MMC commands during initialization", + "Has eMMC command queue engine",/* MMC_CAP2_CQE (1 << 23) */ + "CQE can issue a direct command",/*MMC_CAP2_CQE_DCMD (1 << 24)*/ + "",/* (1 << 25) */ + "",/* (1 << 26) */ + "",/* (1 << 27) */ + "",/* (1 << 28) */ + "",/* (1 << 29) */ + "",/* (1 << 30) */ + ""/* (1 << 31) */ + }; + + struct mmc_host *host = s->private; + u32 caps = host->caps; + u32 caps2 = host->caps2; + int bit; + int size = sizeof(u32) * BITS_PER_BYTE; + + seq_puts(s, "MMC Host capabilities are:\n"); + seq_puts(s, "=============================================\n"); + + for_each_set_bit(bit, (const unsigned long *)&caps, size) + seq_printf(s, "%s\n", mmc_host_capabilities[bit]); + + seq_puts(s, "=============================================\n"); + seq_puts(s, "MMC Host additional capabilities are:\n"); + seq_puts(s, "=============================================\n"); + + for_each_set_bit(bit, (const unsigned long *)&caps2, size) + seq_printf(s, "%s\n", mmc_host_capabilities2[bit]); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(mmc_caps); + void mmc_add_host_debugfs(struct mmc_host *host) { struct dentry *root; @@ -243,6 +351,9 @@ void mmc_add_host_debugfs(struct mmc_host *host) if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) goto err_node; + if (!debugfs_create_file("caps", S_IRUSR, root, host, &mmc_caps_fops)) + goto err_node; + if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, &mmc_clock_fops)) goto err_node; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
