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mmc: renesas-sdhi: Initialize module on RZ/G2L

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On the Renesas RZ/G2L SoC family, we must ensure that the required clock
signals are enabled and the reset signal is de-asserted before we try to
communicate with the SDHI module.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
This commit is contained in:
Paul Barker 2023-10-16 10:25:38 +01:00 • committed by Marek Vasut
parent e84dddf10a
commit 93c811b733
1 changed files with 73 additions and 1 deletions
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74
drivers/mmc/renesas-sdhi.c
View file

@ -20,6 +20,7 @@
#include <linux/io.h>
#include <linux/sizes.h>
#include <power/regulator.h>
#include <reset.h>
#include <asm/unaligned.h>
#include "tmio-common.h"
@ -958,6 +959,74 @@ static void renesas_sdhi_filter_caps(struct udevice *dev)
priv->needs_clkh_fallback = false;
}
static int rzg2l_sdhi_setup(struct udevice *dev)
{
struct tmio_sd_priv *priv = dev_get_priv(dev);
struct clk imclk2, aclk;
struct reset_ctl rst;
int ret;
/*
* On members of the RZ/G2L SoC family, we need to enable
* additional chip detect and bus clocks, then release the SDHI
* module from reset.
*/
ret = clk_get_by_name(dev, "cd", &imclk2);
if (ret < 0) {
dev_err(dev, "failed to get imclk2 (chip detect clk)\n");
goto err_get_imclk2;
}
ret = clk_get_by_name(dev, "aclk", &aclk);
if (ret < 0) {
dev_err(dev, "failed to get aclk\n");
goto err_get_aclk;
}
ret = clk_enable(&imclk2);
if (ret < 0) {
dev_err(dev, "failed to enable imclk2 (chip detect clk)\n");
goto err_imclk2;
}
ret = clk_enable(&aclk);
if (ret < 0) {
dev_err(dev, "failed to enable aclk\n");
goto err_aclk;
}
ret = reset_get_by_index(dev, 0, &rst);
if (ret < 0) {
dev_err(dev, "failed to get reset line\n");
goto err_reset;
}
ret = reset_deassert(&rst);
if (ret < 0) {
dev_err(dev, "failed to de-assert reset line\n");
goto err_reset;
}
ret = tmio_sd_probe(dev, priv->quirks);
if (ret)
goto err_tmio_probe;
return 0;
err_tmio_probe:
reset_assert(&rst);
err_reset:
clk_disable(&aclk);
err_aclk:
clk_disable(&imclk2);
err_imclk2:
clk_free(&aclk);
err_get_aclk:
clk_free(&imclk2);
err_get_imclk2:
return ret;
}
static int renesas_sdhi_probe(struct udevice *dev)
{
struct tmio_sd_priv *priv = dev_get_priv(dev);
@ -1012,7 +1081,10 @@ static int renesas_sdhi_probe(struct udevice *dev)
goto err_clkh;
}
ret = tmio_sd_probe(dev, priv->quirks);
if (device_is_compatible(dev, "renesas,sdhi-r9a07g044"))
ret = rzg2l_sdhi_setup(dev);
else
ret = tmio_sd_probe(dev, priv->quirks);
if (ret)
goto err_tmio_probe;