diff options
Diffstat (limited to 'drivers/net/wireless/microchip/wilc1000/spi.c')
| -rw-r--r-- | drivers/net/wireless/microchip/wilc1000/spi.c | 81 |
1 files changed, 58 insertions, 23 deletions
diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c index 1d8b241ce43c..61c3572ce321 100644 --- a/drivers/net/wireless/microchip/wilc1000/spi.c +++ b/drivers/net/wireless/microchip/wilc1000/spi.c @@ -42,7 +42,7 @@ MODULE_PARM_DESC(enable_crc16, #define WILC_SPI_RSP_HDR_EXTRA_DATA 8 struct wilc_spi { - bool isinit; /* true if SPI protocol has been configured */ + bool isinit; /* true if wilc_spi_init was successful */ bool probing_crc; /* true if we're probing chip's CRC config */ bool crc7_enabled; /* true if crc7 is currently enabled */ bool crc16_enabled; /* true if crc16 is currently enabled */ @@ -55,6 +55,8 @@ struct wilc_spi { static const struct wilc_hif_func wilc_hif_spi; static int wilc_spi_reset(struct wilc *wilc); +static int wilc_spi_configure_bus_protocol(struct wilc *wilc); +static int wilc_validate_chipid(struct wilc *wilc); /******************************************** * @@ -192,11 +194,11 @@ static void wilc_wlan_power(struct wilc *wilc, bool on) /* assert ENABLE: */ gpiod_set_value(gpios->enable, 1); mdelay(5); - /* assert RESET: */ - gpiod_set_value(gpios->reset, 1); - } else { /* deassert RESET: */ gpiod_set_value(gpios->reset, 0); + } else { + /* assert RESET: */ + gpiod_set_value(gpios->reset, 1); /* deassert ENABLE: */ gpiod_set_value(gpios->enable, 0); } @@ -232,8 +234,27 @@ static int wilc_bus_probe(struct spi_device *spi) } clk_prepare_enable(wilc->rtc_clk); + dev_info(&spi->dev, "Selected CRC config: crc7=%s, crc16=%s\n", + enable_crc7 ? "on" : "off", enable_crc16 ? "on" : "off"); + + /* we need power to configure the bus protocol and to read the chip id: */ + + wilc_wlan_power(wilc, true); + + ret = wilc_spi_configure_bus_protocol(wilc); + if (ret) + goto power_down; + + ret = wilc_validate_chipid(wilc); + if (ret) + goto power_down; + + wilc_wlan_power(wilc, false); return 0; +power_down: + clk_disable_unprepare(wilc->rtc_clk); + wilc_wlan_power(wilc, false); netdev_cleanup: wilc_netdev_cleanup(wilc); free: @@ -301,7 +322,6 @@ static int wilc_spi_tx(struct wilc *wilc, u8 *b, u32 len) memset(&msg, 0, sizeof(msg)); spi_message_init(&msg); - msg.spi = spi; spi_message_add_tail(&tr, &msg); ret = spi_sync(spi, &msg); @@ -344,7 +364,6 @@ static int wilc_spi_rx(struct wilc *wilc, u8 *rb, u32 rlen) memset(&msg, 0, sizeof(msg)); spi_message_init(&msg); - msg.spi = spi; spi_message_add_tail(&tr, &msg); ret = spi_sync(spi, &msg); @@ -382,8 +401,6 @@ static int wilc_spi_tx_rx(struct wilc *wilc, u8 *wb, u8 *rb, u32 rlen) memset(&msg, 0, sizeof(msg)); spi_message_init(&msg); - msg.spi = spi; - spi_message_add_tail(&tr, &msg); ret = spi_sync(spi, &msg); if (ret < 0) @@ -477,7 +494,7 @@ static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz) ********************************************/ static u8 wilc_get_crc7(u8 *buffer, u32 len) { - return crc7_be(0xfe, buffer, len); + return crc7_be(0xfe, buffer, len) | 0x01; } static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b, @@ -1106,26 +1123,34 @@ static int wilc_spi_deinit(struct wilc *wilc) static int wilc_spi_init(struct wilc *wilc, bool resume) { - struct spi_device *spi = to_spi_device(wilc->dev); struct wilc_spi *spi_priv = wilc->bus_data; - u32 reg; - u32 chipid; - int ret, i; + int ret; if (spi_priv->isinit) { /* Confirm we can read chipid register without error: */ - ret = wilc_spi_read_reg(wilc, WILC_CHIPID, &chipid); - if (ret == 0) + if (wilc_validate_chipid(wilc) == 0) return 0; - - dev_err(&spi->dev, "Fail cmd read chip id...\n"); } wilc_wlan_power(wilc, true); - /* - * configure protocol - */ + ret = wilc_spi_configure_bus_protocol(wilc); + if (ret) { + wilc_wlan_power(wilc, false); + return ret; + } + + spi_priv->isinit = true; + + return 0; +} + +static int wilc_spi_configure_bus_protocol(struct wilc *wilc) +{ + struct spi_device *spi = to_spi_device(wilc->dev); + struct wilc_spi *spi_priv = wilc->bus_data; + u32 reg; + int ret, i; /* * Infer the CRC settings that are currently in effect. This @@ -1177,6 +1202,15 @@ static int wilc_spi_init(struct wilc *wilc, bool resume) spi_priv->probing_crc = false; + return 0; +} + +static int wilc_validate_chipid(struct wilc *wilc) +{ + struct spi_device *spi = to_spi_device(wilc->dev); + u32 chipid; + int ret; + /* * make sure can read chip id without protocol error */ @@ -1185,9 +1219,10 @@ static int wilc_spi_init(struct wilc *wilc, bool resume) dev_err(&spi->dev, "Fail cmd read chip id...\n"); return ret; } - - spi_priv->isinit = true; - + if (!is_wilc1000(chipid)) { + dev_err(&spi->dev, "Unknown chip id 0x%x\n", chipid); + return -ENODEV; + } return 0; } |