mmc: sdhci-omap: Add card_busy host ops

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Add card_busy host ops in sdhci_omap to check card busy status.

The voltage switching sequence for AM572x platform is mentioned
in Figure 25-48. eMMC/SD/SDIO Power Switching Procedure of
AM572x Sitara Processors Silicon Revision 2.0, 1.1 TRM
(SPRUHZ6I - October 2014–Revised April 2017 [1]).

In the voltage switching sequence, CLKEXTFREE bit in MMCHS_CON
should also be set after switching to 1.8v which is also taken
care in the card_busy ops.

[1] -> http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Kishon Vijay Abraham I 2018-02-05 18:20:15 +05:30 • committed by Ulf Hansson

parent 300df508c8

commit 20ea26a1e3

1 changed files with 52 additions and 0 deletions

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drivers/mmc/host/sdhci-omap.c

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