rsi: chip reset for SDIO interface

We need to reset the chip in teardown path so that it can work
next time when driver is loaded. This patch adds support for
this reset configuration for SDIO.

Signed-off-by: Karun Eagalapati <karun256@gmail.com>
Signed-off-by: Amitkumar Karwar <amit.karwar@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c
index b5ac503..ebfd29c 100644 (file)
--- a/drivers/net/wireless/rsi/rsi_91x_sdio.c
+++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c
@@ -933,6 +933,84 @@ fail:
        return 1;
 }
 
+static void ulp_read_write(struct rsi_hw *adapter, u16 addr, u32 data,
+                          u16 len_in_bits)
+{
+       rsi_sdio_master_reg_write(adapter, RSI_GSPI_DATA_REG1,
+                                 ((addr << 6) | ((data >> 16) & 0xffff)), 2);
+       rsi_sdio_master_reg_write(adapter, RSI_GSPI_DATA_REG0,
+                                 (data & 0xffff), 2);
+       rsi_sdio_master_reg_write(adapter, RSI_GSPI_CTRL_REG0,
+                                 RSI_GSPI_CTRL_REG0_VALUE, 2);
+       rsi_sdio_master_reg_write(adapter, RSI_GSPI_CTRL_REG1,
+                                 ((len_in_bits - 1) | RSI_GSPI_TRIG), 2);
+       msleep(20);
+}
+
+/*This function resets and re-initializes the chip.*/
+static void rsi_reset_chip(struct rsi_hw *adapter)
+{
+       __le32 data;
+       u8 sdio_interrupt_status = 0;
+       u8 request = 1;
+       int ret;
+
+       rsi_dbg(INFO_ZONE, "Writing disable to wakeup register\n");
+       ret =  rsi_sdio_write_register(adapter, 0, SDIO_WAKEUP_REG, &request);
+       if (ret < 0) {
+               rsi_dbg(ERR_ZONE,
+                       "%s: Failed to write SDIO wakeup register\n", __func__);
+               return;
+       }
+       msleep(20);
+       ret =  rsi_sdio_read_register(adapter, RSI_FN1_INT_REGISTER,
+                                     &sdio_interrupt_status);
+       if (ret < 0) {
+               rsi_dbg(ERR_ZONE, "%s: Failed to Read Intr Status Register\n",
+                       __func__);
+               return;
+       }
+       rsi_dbg(INFO_ZONE, "%s: Intr Status Register value = %d\n",
+               __func__, sdio_interrupt_status);
+
+       /* Put Thread-Arch processor on hold */
+       if (rsi_sdio_master_access_msword(adapter, TA_BASE_ADDR)) {
+               rsi_dbg(ERR_ZONE,
+                       "%s: Unable to set ms word to common reg\n",
+                       __func__);
+               return;
+       }
+
+       data = TA_HOLD_THREAD_VALUE;
+       if (rsi_sdio_write_register_multiple(adapter, TA_HOLD_THREAD_REG |
+                                            RSI_SD_REQUEST_MASTER,
+                                            (u8 *)&data, 4)) {
+               rsi_dbg(ERR_ZONE,
+                       "%s: Unable to hold Thread-Arch processor threads\n",
+                       __func__);
+               return;
+       }
+
+       /* This msleep will ensure Thread-Arch processor to go to hold
+        * and any pending dma transfers to rf spi in device to finish.
+        */
+       msleep(100);
+
+       ulp_read_write(adapter, RSI_ULP_RESET_REG, RSI_ULP_WRITE_0, 32);
+       ulp_read_write(adapter, RSI_WATCH_DOG_TIMER_1, RSI_ULP_WRITE_2, 32);
+       ulp_read_write(adapter, RSI_WATCH_DOG_TIMER_2, RSI_ULP_WRITE_0, 32);
+       ulp_read_write(adapter, RSI_WATCH_DOG_DELAY_TIMER_1, RSI_ULP_WRITE_50,
+                      32);
+       ulp_read_write(adapter, RSI_WATCH_DOG_DELAY_TIMER_2, RSI_ULP_WRITE_0,
+                      32);
+       ulp_read_write(adapter, RSI_WATCH_DOG_TIMER_ENABLE,
+                      RSI_ULP_TIMER_ENABLE, 32);
+       /* This msleep will be sufficient for the ulp
+        * read write operations to complete for chip reset.
+        */
+       msleep(500);
+}
+
 /**
  * rsi_disconnect() - This function performs the reverse of the probe function.
  * @pfunction: Pointer to the sdio_func structure.
@@ -956,7 +1034,7 @@ static void rsi_disconnect(struct sdio_func *pfunction)
        sdio_release_irq(pfunction);
        sdio_disable_func(pfunction);
        rsi_91x_deinit(adapter);
-       /* Resetting to take care of the case, where-in driver is re-loaded */
+       rsi_reset_chip(adapter);
        rsi_reset_card(pfunction);
        sdio_release_host(pfunction);
 }

diff --git a/drivers/net/wireless/rsi/rsi_hal.h b/drivers/net/wireless/rsi/rsi_hal.h
index 902dc54..3179e86 100644 (file)
--- a/drivers/net/wireless/rsi/rsi_hal.h
+++ b/drivers/net/wireless/rsi/rsi_hal.h
@@ -52,6 +52,39 @@
 #define FW_LOADING_SUCCESSFUL          'S'
 #define LOADING_INITIATED              '1'
 
+#define RSI_ULP_RESET_REG              0x161
+#define RSI_WATCH_DOG_TIMER_1          0x16c
+#define RSI_WATCH_DOG_TIMER_2          0x16d
+#define RSI_WATCH_DOG_DELAY_TIMER_1            0x16e
+#define RSI_WATCH_DOG_DELAY_TIMER_2            0x16f
+#define RSI_WATCH_DOG_TIMER_ENABLE             0x170
+
+#define RSI_ULP_WRITE_0                        00
+#define RSI_ULP_WRITE_2                        02
+#define RSI_ULP_WRITE_50               50
+
+#define RSI_RESTART_WDT                        BIT(11)
+#define RSI_BYPASS_ULP_ON_WDT          BIT(1)
+
+#define RSI_ULP_TIMER_ENABLE           ((0xaa000) | RSI_RESTART_WDT |  \
+                                        RSI_BYPASS_ULP_ON_WDT)
+#define RSI_RF_SPI_PROG_REG_BASE_ADDR  0x40080000
+
+#define RSI_GSPI_CTRL_REG0             (RSI_RF_SPI_PROG_REG_BASE_ADDR)
+#define RSI_GSPI_CTRL_REG1             (RSI_RF_SPI_PROG_REG_BASE_ADDR + 0x2)
+#define RSI_GSPI_DATA_REG0             (RSI_RF_SPI_PROG_REG_BASE_ADDR + 0x4)
+#define RSI_GSPI_DATA_REG1             (RSI_RF_SPI_PROG_REG_BASE_ADDR + 0x6)
+#define RSI_GSPI_DATA_REG2             (RSI_RF_SPI_PROG_REG_BASE_ADDR + 0x8)
+
+#define RSI_GSPI_CTRL_REG0_VALUE               0x340
+
+#define RSI_GSPI_DMA_MODE                      BIT(13)
+
+#define RSI_GSPI_2_ULP                 BIT(12)
+#define RSI_GSPI_TRIG                  BIT(7)
+#define RSI_GSPI_READ                  BIT(6)
+#define RSI_GSPI_RF_SPI_ACTIVE         BIT(8)
+
 /* Boot loader commands */
 #define SEND_RPS_FILE                  '2'
 

diff --git a/drivers/net/wireless/rsi/rsi_sdio.h b/drivers/net/wireless/rsi/rsi_sdio.h
index 9fb73f6..f11f818 100644 (file)
--- a/drivers/net/wireless/rsi/rsi_sdio.h
+++ b/drivers/net/wireless/rsi/rsi_sdio.h
@@ -58,6 +58,7 @@ enum sdio_interrupt_type {
 #define SDIO_READ_START_LVL                     0x000FC
 #define SDIO_READ_FIFO_CTL                      0x000FD
 #define SDIO_WRITE_FIFO_CTL                     0x000FE
+#define SDIO_WAKEUP_REG                                0x000FF
 #define SDIO_FUN1_INTR_CLR_REG                  0x0008
 #define SDIO_REG_HIGH_SPEED                     0x0013