2021-04-23 18:30:20

by Ajay Singh

[permalink] [raw]
Subject: [PATCH 04/12] wilc1000: setup registers to support chip wakeup sequence

From: Ajay Singh <[email protected]>

Configure required register for WILC1000 wakeup sequence out of sleep
for SPI and SDIO module.

Signed-off-by: Ajay Singh <[email protected]>
---
.../wireless/microchip/wilc1000/cfg80211.c | 1 -
.../net/wireless/microchip/wilc1000/netdev.h | 1 -
.../net/wireless/microchip/wilc1000/wlan.c | 98 ++++++++++---------
.../net/wireless/microchip/wilc1000/wlan.h | 2 +
.../net/wireless/microchip/wilc1000/wlan_if.h | 6 --
5 files changed, 53 insertions(+), 55 deletions(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/cfg80211.c b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
index 75160ab3914a..91a471f3b1c8 100644
--- a/drivers/net/wireless/microchip/wilc1000/cfg80211.c
+++ b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
@@ -1726,7 +1726,6 @@ int wilc_cfg80211_init(struct wilc **wilc, struct device *dev, int io_type,
*wilc = wl;
wl->io_type = io_type;
wl->hif_func = ops;
- wl->chip_ps_state = WILC_CHIP_WAKEDUP;

for (i = 0; i < NQUEUES; i++)
INIT_LIST_HEAD(&wl->txq[i].txq_head.list);
diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.h b/drivers/net/wireless/microchip/wilc1000/netdev.h
index a39c62a20f04..79f73a72da57 100644
--- a/drivers/net/wireless/microchip/wilc1000/netdev.h
+++ b/drivers/net/wireless/microchip/wilc1000/netdev.h
@@ -265,7 +265,6 @@ struct wilc {
bool suspend_event;

struct workqueue_struct *hif_workqueue;
- enum chip_ps_states chip_ps_state;
struct wilc_cfg cfg;
void *bus_data;
struct net_device *monitor_dev;
diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.c b/drivers/net/wireless/microchip/wilc1000/wlan.c
index 2030fc7f53ca..177e42a9a603 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan.c
+++ b/drivers/net/wireless/microchip/wilc1000/wlan.c
@@ -10,6 +10,8 @@
#include "cfg80211.h"
#include "wlan_cfg.h"

+#define WAKE_UP_TRIAL_RETRY 10000
+
static inline bool is_wilc1000(u32 id)
{
return (id & (~WILC_CHIP_REV_FIELD)) == WILC_1000_BASE_ID;
@@ -611,60 +613,62 @@ EXPORT_SYMBOL_GPL(chip_allow_sleep);

void chip_wakeup(struct wilc *wilc)
{
- u32 reg, clk_status_reg;
- const struct wilc_hif_func *h = wilc->hif_func;
-
- if (wilc->io_type == WILC_HIF_SPI) {
- do {
- h->hif_read_reg(wilc, WILC_SPI_WAKEUP_REG, &reg);
- h->hif_write_reg(wilc, WILC_SPI_WAKEUP_REG,
- reg | WILC_SPI_WAKEUP_BIT);
- h->hif_write_reg(wilc, WILC_SPI_WAKEUP_REG,
- reg & ~WILC_SPI_WAKEUP_BIT);
-
- do {
- usleep_range(2000, 2500);
- wilc_get_chipid(wilc, true);
- } while (wilc_get_chipid(wilc, true) == 0);
- } while (wilc_get_chipid(wilc, true) == 0);
- } else if (wilc->io_type == WILC_HIF_SDIO) {
- h->hif_write_reg(wilc, WILC_SDIO_HOST_TO_FW_REG,
- WILC_SDIO_HOST_TO_FW_BIT);
- usleep_range(200, 400);
- h->hif_read_reg(wilc, WILC_SDIO_WAKEUP_REG, &reg);
- do {
- h->hif_write_reg(wilc, WILC_SDIO_WAKEUP_REG,
- reg | WILC_SDIO_WAKEUP_BIT);
- h->hif_read_reg(wilc, WILC_SDIO_CLK_STATUS_REG,
- &clk_status_reg);
-
- while (!(clk_status_reg & WILC_SDIO_CLK_STATUS_BIT)) {
- usleep_range(2000, 2500);
+ u32 ret = 0;
+ u32 clk_status_val = 0, trials = 0;
+ u32 wakeup_reg, wakeup_bit;
+ u32 clk_status_reg, clk_status_bit;
+ u32 to_host_from_fw_reg, to_host_from_fw_bit;
+ u32 from_host_to_fw_reg, from_host_to_fw_bit;
+ const struct wilc_hif_func *hif_func = wilc->hif_func;

- h->hif_read_reg(wilc, WILC_SDIO_CLK_STATUS_REG,
- &clk_status_reg);
- }
- if (!(clk_status_reg & WILC_SDIO_CLK_STATUS_BIT)) {
- h->hif_write_reg(wilc, WILC_SDIO_WAKEUP_REG,
- reg & ~WILC_SDIO_WAKEUP_BIT);
- }
- } while (!(clk_status_reg & WILC_SDIO_CLK_STATUS_BIT));
+ if (wilc->io_type == WILC_HIF_SDIO) {
+ wakeup_reg = WILC_SDIO_WAKEUP_REG;
+ wakeup_bit = WILC_SDIO_WAKEUP_BIT;
+ clk_status_reg = WILC_SDIO_CLK_STATUS_REG;
+ clk_status_bit = WILC_SDIO_CLK_STATUS_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;
+ clk_status_reg = WILC_SPI_CLK_STATUS_REG;
+ clk_status_bit = WILC_SPI_CLK_STATUS_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;
}

- if (wilc->chip_ps_state == WILC_CHIP_SLEEPING_MANUAL) {
- if (wilc_get_chipid(wilc, false) < WILC_1000_BASE_ID_2B) {
- u32 val32;
+ /* indicate host wakeup */
+ ret = hif_func->hif_write_reg(wilc, from_host_to_fw_reg,
+ from_host_to_fw_bit);
+ if (ret)
+ return;

- h->hif_read_reg(wilc, WILC_REG_4_TO_1_RX, &val32);
- val32 |= BIT(6);
- h->hif_write_reg(wilc, WILC_REG_4_TO_1_RX, val32);
+ /* Set wake-up bit */
+ ret = hif_func->hif_write_reg(wilc, wakeup_reg,
+ wakeup_bit);
+ if (ret)
+ return;

- h->hif_read_reg(wilc, WILC_REG_4_TO_1_TX_BANK0, &val32);
- val32 |= BIT(6);
- h->hif_write_reg(wilc, WILC_REG_4_TO_1_TX_BANK0, val32);
+ while (trials < WAKE_UP_TRIAL_RETRY) {
+ ret = hif_func->hif_read_reg(wilc, clk_status_reg,
+ &clk_status_val);
+ if (ret) {
+ pr_err("Bus error %d %x\n", ret, clk_status_val);
+ return;
}
+ if (clk_status_val & clk_status_bit)
+ break;
+
+ trials++;
+ }
+ if (trials >= WAKE_UP_TRIAL_RETRY) {
+ pr_err("Failed to wake-up the chip\n");
+ return;
}
- wilc->chip_ps_state = WILC_CHIP_WAKEDUP;
}
EXPORT_SYMBOL_GPL(chip_wakeup);

diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.h b/drivers/net/wireless/microchip/wilc1000/wlan.h
index 771c25fa849b..285e5d9a2b48 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan.h
+++ b/drivers/net/wireless/microchip/wilc1000/wlan.h
@@ -97,6 +97,8 @@
#define WILC_SPI_WAKEUP_REG 0x1
#define WILC_SPI_WAKEUP_BIT BIT(1)

+#define WILC_SPI_CLK_STATUS_REG 0x0f
+#define WILC_SPI_CLK_STATUS_BIT BIT(2)
#define WILC_SPI_HOST_TO_FW_REG 0x0b
#define WILC_SPI_HOST_TO_FW_BIT BIT(0)

diff --git a/drivers/net/wireless/microchip/wilc1000/wlan_if.h b/drivers/net/wireless/microchip/wilc1000/wlan_if.h
index 31c68643731d..6eb7eb4ac294 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan_if.h
+++ b/drivers/net/wireless/microchip/wilc1000/wlan_if.h
@@ -48,12 +48,6 @@ enum {
WILC_FW_MAX_PSPOLL_PS = 4
};

-enum chip_ps_states {
- WILC_CHIP_WAKEDUP = 0,
- WILC_CHIP_SLEEPING_AUTO = 1,
- WILC_CHIP_SLEEPING_MANUAL = 2
-};
-
enum bus_acquire {
WILC_BUS_ACQUIRE_ONLY = 0,
WILC_BUS_ACQUIRE_AND_WAKEUP = 1,
--
2.24.0