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[04/10] mmc: tmio: Add UHS-I mode support

Message ID 1457774112-16958-5-git-send-email-wsa@the-dreams.de (mailing list archive)
State New, archived
Headers show

Commit Message

Wolfram Sang March 12, 2016, 9:15 a.m. UTC 
From: Wolfram Sang <wsa+renesas@sang-engineering.com>

Based on work by Shinobu Uehara and Ben Dooks. This adds the voltage
switch operation needed for all UHS-I modes, but not the tuning needed
for SDR-104 which will come later.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---

Changes since RFC:

* pass whole ios instead of just signal_voltage to voltage switch function
* drop PM calls from card_busy callback
* read DAT0 instead of DAT3 for card_busy and simplify function

 drivers/mmc/host/tmio_mmc.h     |  2 ++
 drivers/mmc/host/tmio_mmc_pio.c | 20 ++++++++++++++++++++
 include/linux/mmc/tmio.h        |  2 ++
 3 files changed, 24 insertions(+)
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Patch

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index b44b5890290622..759bf015d09b84 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -101,6 +101,8 @@  struct tmio_mmc_host {
 	void (*clk_disable)(struct tmio_mmc_host *host);
 	int (*multi_io_quirk)(struct mmc_card *card,
 			      unsigned int direction, int blk_size);
+	int (*start_signal_voltage_switch)(struct tmio_mmc_host *host,
+					   struct mmc_ios *ios);
 };
 
 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev);
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index ae81b34f17a5a5..4b5a7af2d2273f 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -1012,12 +1012,32 @@  static int tmio_multi_io_quirk(struct mmc_card *card,
 	return blk_size;
 }
 
+static int tmio_mmc_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+
+	if (!host->start_signal_voltage_switch)
+		return 0;
+
+	return host->start_signal_voltage_switch(host, ios);
+}
+
+static int tmio_mmc_card_busy(struct mmc_host *mmc)
+{
+	struct tmio_mmc_host *host = mmc_priv(mmc);
+
+	return !(sd_ctrl_read32(host, CTL_STATUS2) & TMIO_STATUS2_DAT0);
+}
+
 static const struct mmc_host_ops tmio_mmc_ops = {
 	.request	= tmio_mmc_request,
 	.set_ios	= tmio_mmc_set_ios,
 	.get_ro         = tmio_mmc_get_ro,
 	.get_cd		= mmc_gpio_get_cd,
 	.enable_sdio_irq = tmio_mmc_enable_sdio_irq,
+	.start_signal_voltage_switch
+			= tmio_mmc_start_signal_voltage_switch,
+	.card_busy	= tmio_mmc_card_busy,
 	.multi_io_quirk	= tmio_multi_io_quirk,
 };
 
diff --git a/include/linux/mmc/tmio.h b/include/linux/mmc/tmio.h
index 5f5cd80e976500..b2f28e99503383 100644
--- a/include/linux/mmc/tmio.h
+++ b/include/linux/mmc/tmio.h
@@ -63,6 +63,8 @@ 
 #define TMIO_STAT_CMD_BUSY      0x40000000
 #define TMIO_STAT_ILL_ACCESS    0x80000000
 
+#define TMIO_STATUS2_DAT0	BIT(7)
+
 #define	CLK_CTL_DIV_MASK	0xff
 #define	CLK_CTL_SCLKEN		BIT(8)