From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx> This is a UHS-II version of sdhci's set_timeout() operation. Use sdhci_uhs2_set_timeout() to set and calculate the timeout time. Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx> Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx> --- Updates in V14: - Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the sdhci_uhs2_set_timeout(). Updates in V13: - Modify comment message. Updates in V8: - Initialization be combined with declaration and realigned in sdhci_calc_timeout_uhs2(). - Forward declare struct mmc_command in sdhci_uhs2.h. Updates in V6: - Use GENMASK() and FIELD_PREP() in some case. - Use sdhci_uhs2_mode() to simplify code. - Remove unnecessary functions. --- drivers/mmc/host/sdhci-uhs2.c | 72 +++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci-uhs2.h | 2 + 2 files changed, 74 insertions(+) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 4fe106e2ba8c..a2df109b49d8 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -13,6 +13,7 @@ #include <linux/delay.h> #include <linux/module.h> #include <linux/iopoll.h> +#include <linux/bitfield.h> #include "sdhci.h" #include "sdhci-uhs2.h" @@ -134,6 +135,77 @@ static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, un } } +static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res, u8 *dead_lock) +{ + /* timeout in us */ + unsigned int dead_lock_timeout = 1 * 1000 * 1000; + unsigned int cmd_res_timeout = 5 * 1000; + unsigned int current_timeout; + u8 count; + + /* + * Figure out needed cycles. + * We do this in steps in order to fit inside a 32 bit int. + * The first step is the minimum timeout, which will have a + * minimum resolution of 6 bits: + * (1) 2^13*1000 > 2^22, + * (2) host->timeout_clk < 2^16 + * => + * (1) / (2) > 2^6 + */ + count = 0; + current_timeout = (1 << 13) * 1000 / host->timeout_clk; + while (current_timeout < cmd_res_timeout) { + count++; + current_timeout <<= 1; + if (count >= 0xF) + break; + } + + if (count >= 0xF) { + DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n", + mmc_hostname(host->mmc), count); + count = 0xE; + } + *cmd_res = count; + + count = 0; + current_timeout = (1 << 13) * 1000 / host->timeout_clk; + while (current_timeout < dead_lock_timeout) { + count++; + current_timeout <<= 1; + if (count >= 0xF) + break; + } + + if (count >= 0xF) { + DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n", + mmc_hostname(host->mmc), count); + count = 0xE; + } + *dead_lock = count; + + return count; +} + +static void __sdhci_uhs2_set_timeout(struct sdhci_host *host) +{ + u8 cmd_res, dead_lock; + + sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock); + cmd_res |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock); + sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL); +} + +void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) +{ + __sdhci_set_timeout(host, cmd); + + if (mmc_card_uhs2(host->mmc)) + __sdhci_uhs2_set_timeout(host); +} +EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout); + /*****************************************************************************\ * * * Driver init/exit * diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h index caaf9fba4975..089a6c0cabda 100644 --- a/drivers/mmc/host/sdhci-uhs2.h +++ b/drivers/mmc/host/sdhci-uhs2.h @@ -175,8 +175,10 @@ #define SDHCI_UHS2_VENDOR_PTR 0xE8 struct sdhci_host; +struct mmc_command; void sdhci_uhs2_dump_regs(struct sdhci_host *host); void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask); +void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd); #endif /* __SDHCI_UHS2_H */ -- 2.25.1