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spi: designware_spi: Add reset ctrl to driver

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Add code to reset all reset signals as in SPI DT node. A reset property
is an optional feature, so only print out a warning and do not fail if a
reset property is not present.

If a reset property is discovered, then use it to deassert, thus
bringing the IP out of reset.

Release reset when _remove().

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Ley Foon Tan 2018-09-07 14:25:29 +08:00 committed by Jagan Teki
parent 938db6fe5d
commit 6ac5909f51
1 changed files with 43 additions and 0 deletions
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43
drivers/spi/designware_spi.c
View file

@ -17,6 +17,7 @@
#include <malloc.h>
#include <spi.h>
#include <fdtdec.h>
#include <reset.h>
#include <linux/compat.h>
#include <linux/iopoll.h>
#include <asm/io.h>
@ -111,6 +112,8 @@ struct dw_spi_priv {
void *tx_end;
void *rx;
void *rx_end;
struct reset_ctl_bulk resets;
};
static inline u32 dw_read(struct dw_spi_priv *priv, u32 offset)
@ -231,6 +234,34 @@ err_rate:
return -EINVAL;
}
static int dw_spi_reset(struct udevice *bus)
{
int ret;
struct dw_spi_priv *priv = dev_get_priv(bus);
ret = reset_get_bulk(bus, &priv->resets);
if (ret) {
/*
* Return 0 if error due to !CONFIG_DM_RESET and reset
* DT property is not present.
*/
if (ret == -ENOENT || ret == -ENOTSUPP)
return 0;
dev_warn(bus, "Can't get reset: %d\n", ret);
return ret;
}
ret = reset_deassert_bulk(&priv->resets);
if (ret) {
reset_release_bulk(&priv->resets);
dev_err(bus, "Failed to reset: %d\n", ret);
return ret;
}
return 0;
}
static int dw_spi_probe(struct udevice *bus)
{
struct dw_spi_platdata *plat = dev_get_platdata(bus);
@ -244,6 +275,10 @@ static int dw_spi_probe(struct udevice *bus)
if (ret)
return ret;
ret = dw_spi_reset(bus);
if (ret)
return ret;
/* Currently only bits_per_word == 8 supported */
priv->bits_per_word = 8;
@ -478,6 +513,13 @@ static int dw_spi_set_mode(struct udevice *bus, uint mode)
return 0;
}
static int dw_spi_remove(struct udevice *bus)
{
struct dw_spi_priv *priv = dev_get_priv(bus);
return reset_release_bulk(&priv->resets);
}
static const struct dm_spi_ops dw_spi_ops = {
.xfer = dw_spi_xfer,
.set_speed = dw_spi_set_speed,
@ -502,4 +544,5 @@ U_BOOT_DRIVER(dw_spi) = {
.platdata_auto_alloc_size = sizeof(struct dw_spi_platdata),
.priv_auto_alloc_size = sizeof(struct dw_spi_priv),
.probe = dw_spi_probe,
.remove = dw_spi_remove,
};