Commit f135a157 authored by David Mosberger-Tang's avatar David Mosberger-Tang Committed by Kalle Valo
Browse files

wilc1000: Support chip sleep over SPI 



chip_allow_sleep() only supported wakeup via SDIO, which made the
driver unusable over SPI.  This code is a straight forward port from
the driver in the linux-at91 repository.

Signed-off-by: default avatarDavid Mosberger-Tang <davidm@egauge.net>
Acked-by: default avatarAjay Singh <ajay.kathat@microchip.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210224033317.1507603-1-davidm@egauge.net
parent 4a7ea943

drivers/net/wireless/microchip/wilc1000/wlan.c

+52 −4
Original line number Diff line number Diff line
@@ -552,12 +552,60 @@ static struct rxq_entry_t *wilc_wlan_rxq_remove(struct wilc *wilc) 
void chip_allow_sleep(struct wilc *wilc)

{

	u32 reg = 0;

	const struct wilc_hif_func *hif_func = wilc->hif_func;

	u32 wakeup_reg, wakeup_bit;

	u32 to_host_from_fw_reg, to_host_from_fw_bit;

	u32 from_host_to_fw_reg, from_host_to_fw_bit;

	u32 trials = 100;

	int ret;



	wilc->hif_func->hif_read_reg(wilc, WILC_SDIO_WAKEUP_REG, &reg);

	if (wilc->io_type == WILC_HIF_SDIO) {

		wakeup_reg = WILC_SDIO_WAKEUP_REG;

		wakeup_bit = WILC_SDIO_WAKEUP_BIT;

		from_host_to_fw_reg = WILC_SDIO_HOST_TO_FW_REG;

		from_host_to_fw_bit = WILC_SDIO_HOST_TO_FW_BIT;

		to_host_from_fw_reg = WILC_SDIO_FW_TO_HOST_REG;

		to_host_from_fw_bit = WILC_SDIO_FW_TO_HOST_BIT;

	} else {

		wakeup_reg = WILC_SPI_WAKEUP_REG;

		wakeup_bit = WILC_SPI_WAKEUP_BIT;

		from_host_to_fw_reg = WILC_SPI_HOST_TO_FW_REG;

		from_host_to_fw_bit = WILC_SPI_HOST_TO_FW_BIT;

		to_host_from_fw_reg = WILC_SPI_FW_TO_HOST_REG;

		to_host_from_fw_bit = WILC_SPI_FW_TO_HOST_BIT;

	}



	wilc->hif_func->hif_write_reg(wilc, WILC_SDIO_WAKEUP_REG,

				      reg & ~WILC_SDIO_WAKEUP_BIT);

	wilc->hif_func->hif_write_reg(wilc, WILC_SDIO_HOST_TO_FW_REG, 0);

	while (trials--) {

		ret = hif_func->hif_read_reg(wilc, to_host_from_fw_reg, &reg);

		if (ret)

			return;

		if ((reg & to_host_from_fw_bit) == 0)

			break;

	}

	if (!trials)

		pr_warn("FW not responding\n");



	/* Clear bit 1 */

	ret = hif_func->hif_read_reg(wilc, wakeup_reg, &reg);

	if (ret)

		return;

	if (reg & wakeup_bit) {

		reg &= ~wakeup_bit;

		ret = hif_func->hif_write_reg(wilc, wakeup_reg, reg);

		if (ret)

			return;

	}



	ret = hif_func->hif_read_reg(wilc, from_host_to_fw_reg, &reg);

	if (ret)

		return;

	if (reg & from_host_to_fw_bit) {

		reg &= ~from_host_to_fw_bit;

		ret = hif_func->hif_write_reg(wilc, from_host_to_fw_reg, reg);

		if (ret)

			return;



	}

}

EXPORT_SYMBOL_GPL(chip_allow_sleep);

drivers/net/wireless/microchip/wilc1000/wlan.h

+6 −0
Original line number Diff line number Diff line
@@ -97,6 +97,12 @@ 
#define WILC_SPI_WAKEUP_REG		0x1

#define WILC_SPI_WAKEUP_BIT		BIT(1)



#define WILC_SPI_HOST_TO_FW_REG		0x0b

#define WILC_SPI_HOST_TO_FW_BIT		BIT(0)



#define WILC_SPI_FW_TO_HOST_REG		0x10

#define WILC_SPI_FW_TO_HOST_BIT		BIT(0)



#define WILC_SPI_PROTOCOL_OFFSET	(WILC_SPI_PROTOCOL_CONFIG - \

					 WILC_SPI_REG_BASE)