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wilc1000: Support chip sleep over SPI

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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: David Mosberger-Tang <davidm@egauge.net>
Acked-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210224033317.1507603-1-davidm@egauge.net
This commit is contained in:
David Mosberger-Tang 2021-02-24 03:33:23 +00:00 committed by Kalle Valo
parent 4a7ea94377
commit f135a1571a
2 changed files with 58 additions and 4 deletions
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56
drivers/net/wireless/microchip/wilc1000/wlan.c
View File

@ -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);

6
drivers/net/wireless/microchip/wilc1000/wlan.h
View File

@ -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)