From: Ai Kyuse <ai.kyuse.uw@xxxxxxxxxxx>
Add eMMC HS400 support to the core TMIO code.
Regarding tuning: Tune in HS200 mode before changing to HS400 mode. When
retuning, return to HS200 mode and tune. HS400 and HS200/SDR104 have
different CPG settings, HS400 sets to 400MHz to distinguish the CPG
settings.
Signed-off-by: Ai Kyuse <ai.kyuse.uw@xxxxxxxxxxx>
Signed-off-by: Masaharu Hayakawa <masaharu.hayakawa.ry@xxxxxxxxxxx>
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
---
v1 [Simon Horman]
- Combined patches by Ai Kyuse and Masaharu Hayakawa.
- Rebase
- Minor clean-up
v0 [Ai Kyuse]
---
drivers/mmc/host/tmio_mmc.h | 5 +++++
drivers/mmc/host/tmio_mmc_core.c | 29 +++++++++++++++++++++++++++--
2 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 3e6ff8921440..60f5935db368 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -46,6 +46,7 @@
#define CTL_DMA_ENABLE 0xd8
#define CTL_RESET_SD 0xe0
#define CTL_VERSION 0xe2
+#define CTL_SDIF_MODE 0xe6
#define CTL_SDIO_REGS 0x100
#define CTL_CLK_AND_WAIT_CTL 0x138
#define CTL_RESET_SDIO 0x1e0
@@ -203,6 +204,10 @@ struct tmio_mmc_host {
/* Tuning values: 1 for success, 0 for failure */
DECLARE_BITMAP(taps, BITS_PER_BYTE * sizeof(long));
unsigned int tap_num;
+ unsigned long tap_set;
+ void (*prepare_hs400_tuning)(struct mmc_host *mmc, struct mmc_ios *ios);
+ void (*reset_hs400_mode)(struct mmc_host *mmc);
+ void (*disable_scc)(struct mmc_host *mmc);
const struct tmio_mmc_dma_ops *dma_ops;
};
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index d6ca57be16c2..a65c10302904 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -199,6 +199,13 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
tmio_mmc_clk_stop(host);
return;
}
+ /*
+ * Both HS400 and HS200/SD104 set 200MHz, but HS400 sets 400MHz
+ * to distinguish the CPG settings.
+ */
+ if (host->mmc->ios.timing == MMC_TIMING_MMC_HS400 &&
+ new_clock == 200000000)
+ new_clock = 400000000;
if (host->clk_update)
clock = host->clk_update(host, new_clock) / 512;
@@ -209,8 +216,13 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
clock <<= 1;
/* 1/1 clock is option */
- if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1))
- clk |= 0xff;
+ if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) &&
+ ((clk >> 22) & 0x1)) {
+ if (!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400))
+ clk |= 0xff;
+ else
+ clk &= ~0xff;
+ }
if (host->set_clk_div)
host->set_clk_div(host->pdev, (clk >> 22) & 1);
@@ -1015,6 +1027,15 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
struct device *dev = &host->pdev->dev;
unsigned long flags;
+
+ if (ios->timing != MMC_TIMING_UHS_SDR104 &&
+ ios->timing != MMC_TIMING_MMC_HS200 &&
+ ios->timing != MMC_TIMING_MMC_HS400 && host->disable_scc)
+ host->disable_scc(mmc);
+
+ if (ios->timing != MMC_TIMING_MMC_HS400 && host->reset_hs400_mode)
+ host->reset_hs400_mode(mmc);
+
mutex_lock(&host->ios_lock);
spin_lock_irqsave(&host->lock, flags);
@@ -1065,6 +1086,10 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
"%s.%d: IOS interrupted: clk %u, mode %u",
current->comm, task_pid_nr(current),
ios->clock, ios->power_mode);
+
+ if (ios->timing == MMC_TIMING_MMC_HS400 && host->prepare_hs400_tuning)
+ host->prepare_hs400_tuning(mmc, ios);
+
host->mrq = NULL;
host->clk_cache = ios->clock;
--
2.11.0
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