Commit 21bb08cd authored by Colin Foster's avatar Colin Foster Committed by Jakub Kicinski
Browse files

net: mscc: ocelot: utilize readx_poll_timeout() for chip reset 



Clean up the reset code by utilizing readx_poll_timeout instead of a custom
loop.

Signed-off-by: default avatarColin Foster <colin.foster@in-advantage.com>
Reviewed-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent d294ad82

drivers/net/ethernet/mscc/ocelot_vsc7514.c

+23 −9
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 */

#include <linux/dsa/ocelot.h>

#include <linux/interrupt.h>

#include <linux/iopoll.h>

#include <linux/module.h>

#include <linux/of_net.h>

#include <linux/netdevice.h>
@@ -25,6 +26,9 @@ 
#define VSC7514_VCAP_POLICER_BASE			128

#define VSC7514_VCAP_POLICER_MAX			191



#define MEM_INIT_SLEEP_US				1000

#define MEM_INIT_TIMEOUT_US				100000



static const u32 *ocelot_regmap[TARGET_MAX] = {

	[ANA] = vsc7514_ana_regmap,

	[QS] = vsc7514_qs_regmap,
@@ -191,22 +195,32 @@ static const struct of_device_id mscc_ocelot_match[] = { 
};

MODULE_DEVICE_TABLE(of, mscc_ocelot_match);



static int ocelot_mem_init_status(struct ocelot *ocelot)

{

	unsigned int val;

	int err;



	err = regmap_field_read(ocelot->regfields[SYS_RESET_CFG_MEM_INIT],

				&val);



	return err ?: val;

}



static int ocelot_reset(struct ocelot *ocelot)

{

	int retries = 100;

	int err;

	u32 val;



	regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_INIT], 1);

	regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_ENA], 1);



	do {

		msleep(1);

		regmap_field_read(ocelot->regfields[SYS_RESET_CFG_MEM_INIT],

				  &val);

	} while (val && --retries);



	if (!retries)

		return -ETIMEDOUT;

	/* MEM_INIT is a self-clearing bit. Wait for it to be cleared (should be

	 * 100us) before enabling the switch core.

	 */

	err = readx_poll_timeout(ocelot_mem_init_status, ocelot, val, !val,

				 MEM_INIT_SLEEP_US, MEM_INIT_TIMEOUT_US);

	if (err)

		return err;



	regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_ENA], 1);

	regmap_field_write(ocelot->regfields[SYS_RESET_CFG_CORE_ENA], 1);