diff options
Diffstat (limited to 'drivers/net/can/m_can/tcan4x5x-core.c')
| -rw-r--r-- | drivers/net/can/m_can/tcan4x5x-core.c | 232 |
1 files changed, 209 insertions, 23 deletions
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c index 2342aa011647..31cc9d0abd45 100644 --- a/drivers/net/can/m_can/tcan4x5x-core.c +++ b/drivers/net/can/m_can/tcan4x5x-core.c @@ -6,8 +6,9 @@ #define TCAN4X5X_EXT_CLK_DEF 40000000 -#define TCAN4X5X_DEV_ID0 0x00 -#define TCAN4X5X_DEV_ID1 0x04 +#define TCAN4X5X_DEV_ID1 0x00 +#define TCAN4X5X_DEV_ID1_TCAN 0x4e414354 /* ASCII TCAN */ +#define TCAN4X5X_DEV_ID2 0x04 #define TCAN4X5X_REV 0x08 #define TCAN4X5X_STATUS 0x0C #define TCAN4X5X_ERROR_STATUS_MASK 0x10 @@ -80,6 +81,7 @@ TCAN4X5X_MCAN_IR_RF1F) #define TCAN4X5X_MRAM_START 0x8000 +#define TCAN4X5X_MRAM_SIZE 0x800 #define TCAN4X5X_MCAN_OFFSET 0x1000 #define TCAN4X5X_CLEAR_ALL_INT 0xffffffff @@ -90,6 +92,8 @@ #define TCAN4X5X_MODE_STANDBY BIT(6) #define TCAN4X5X_MODE_NORMAL BIT(7) +#define TCAN4X5X_NWKRQ_VOLTAGE_VIO BIT(19) + #define TCAN4X5X_DISABLE_WAKE_MSK (BIT(31) | BIT(30)) #define TCAN4X5X_DISABLE_INH_MSK BIT(9) @@ -102,6 +106,37 @@ #define TCAN4X5X_WD_3_S_TIMER BIT(29) #define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) +struct tcan4x5x_version_info { + const char *name; + u32 id2_register; + + bool has_wake_pin; + bool has_state_pin; +}; + +enum { + TCAN4552 = 0, + TCAN4553, + TCAN4X5X, +}; + +static const struct tcan4x5x_version_info tcan4x5x_versions[] = { + [TCAN4552] = { + .name = "4552", + .id2_register = 0x32353534, + }, + [TCAN4553] = { + .name = "4553", + .id2_register = 0x33353534, + }, + /* generic version with no id2_register at the end */ + [TCAN4X5X] = { + .name = "generic", + .has_wake_pin = true, + .has_state_pin = true, + }, +}; + static inline struct tcan4x5x_priv *cdev_to_priv(struct m_can_classdev *cdev) { return container_of(cdev, struct tcan4x5x_priv, cdev); @@ -234,9 +269,24 @@ static int tcan4x5x_init(struct m_can_classdev *cdev) if (ret) return ret; + if (tcan4x5x->nwkrq_voltage_vio) { + ret = regmap_set_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, + TCAN4X5X_NWKRQ_VOLTAGE_VIO); + if (ret) + return ret; + } + return ret; } +static int tcan4x5x_deinit(struct m_can_classdev *cdev) +{ + struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); + + return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_STANDBY); +}; + static int tcan4x5x_disable_wake(struct m_can_classdev *cdev) { struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); @@ -253,18 +303,59 @@ static int tcan4x5x_disable_state(struct m_can_classdev *cdev) TCAN4X5X_DISABLE_INH_MSK, 0x01); } +static const struct tcan4x5x_version_info +*tcan4x5x_find_version(struct tcan4x5x_priv *priv) +{ + u32 val; + int ret; + + ret = regmap_read(priv->regmap, TCAN4X5X_DEV_ID1, &val); + if (ret) + return ERR_PTR(ret); + + if (val != TCAN4X5X_DEV_ID1_TCAN) { + dev_err(&priv->spi->dev, "Not a tcan device %x\n", val); + return ERR_PTR(-ENODEV); + } + + ret = regmap_read(priv->regmap, TCAN4X5X_DEV_ID2, &val); + if (ret) + return ERR_PTR(ret); + + for (int i = 0; i != ARRAY_SIZE(tcan4x5x_versions); ++i) { + const struct tcan4x5x_version_info *vinfo = &tcan4x5x_versions[i]; + + if (!vinfo->id2_register || val == vinfo->id2_register) { + dev_info(&priv->spi->dev, "Detected TCAN device version %s\n", + vinfo->name); + return vinfo; + } + } + + return &tcan4x5x_versions[TCAN4X5X]; +} + +static void tcan4x5x_get_dt_data(struct m_can_classdev *cdev) +{ + struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); + + tcan4x5x->nwkrq_voltage_vio = + of_property_read_bool(cdev->dev->of_node, "ti,nwkrq-voltage-vio"); +} + static int tcan4x5x_get_gpios(struct m_can_classdev *cdev) { struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); int ret; - tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake", - GPIOD_OUT_HIGH); + tcan4x5x->device_wake_gpio = devm_gpiod_get_optional(cdev->dev, + "device-wake", + GPIOD_OUT_HIGH); if (IS_ERR(tcan4x5x->device_wake_gpio)) { if (PTR_ERR(tcan4x5x->device_wake_gpio) == -EPROBE_DEFER) return -EPROBE_DEFER; - tcan4x5x_disable_wake(cdev); + tcan4x5x->device_wake_gpio = NULL; } tcan4x5x->reset_gpio = devm_gpiod_get_optional(cdev->dev, "reset", @@ -279,16 +370,36 @@ static int tcan4x5x_get_gpios(struct m_can_classdev *cdev) tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev, "device-state", GPIOD_IN); - if (IS_ERR(tcan4x5x->device_state_gpio)) { + if (IS_ERR(tcan4x5x->device_state_gpio)) tcan4x5x->device_state_gpio = NULL; - tcan4x5x_disable_state(cdev); + + return 0; +} + +static int tcan4x5x_check_gpios(struct m_can_classdev *cdev, + const struct tcan4x5x_version_info *version_info) +{ + struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); + int ret; + + if (version_info->has_wake_pin && !tcan4x5x->device_wake_gpio) { + ret = tcan4x5x_disable_wake(cdev); + if (ret) + return ret; + } + + if (version_info->has_state_pin && !tcan4x5x->device_state_gpio) { + ret = tcan4x5x_disable_state(cdev); + if (ret) + return ret; } return 0; } -static struct m_can_ops tcan4x5x_ops = { +static const struct m_can_ops tcan4x5x_ops = { .init = tcan4x5x_init, + .deinit = tcan4x5x_deinit, .read_reg = tcan4x5x_read_reg, .write_reg = tcan4x5x_write_reg, .write_fifo = tcan4x5x_write_fifo, @@ -298,26 +409,32 @@ static struct m_can_ops tcan4x5x_ops = { static int tcan4x5x_can_probe(struct spi_device *spi) { + const struct tcan4x5x_version_info *version_info; struct tcan4x5x_priv *priv; struct m_can_classdev *mcan_class; int freq, ret; mcan_class = m_can_class_allocate_dev(&spi->dev, sizeof(struct tcan4x5x_priv)); - if (!mcan_class) - return -ENOMEM; + if (IS_ERR(mcan_class)) + return PTR_ERR(mcan_class); + + ret = m_can_check_mram_cfg(mcan_class, TCAN4X5X_MRAM_SIZE); + if (ret) + goto out_m_can_class_free_dev; priv = cdev_to_priv(mcan_class); priv->power = devm_regulator_get_optional(&spi->dev, "vsup"); - if (PTR_ERR(priv->power) == -EPROBE_DEFER) { - ret = -EPROBE_DEFER; - goto out_m_can_class_free_dev; - } else { + if (IS_ERR(priv->power)) { + if (PTR_ERR(priv->power) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto out_m_can_class_free_dev; + } priv->power = NULL; } - m_can_class_get_clocks(mcan_class); + mcan_class->cclk = devm_clk_get(mcan_class->dev, "cclk"); if (IS_ERR(mcan_class->cclk)) { dev_err(&spi->dev, "no CAN clock source defined\n"); freq = TCAN4X5X_EXT_CLK_DEF; @@ -327,6 +444,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi) /* Sanity check */ if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) { + dev_err(&spi->dev, "Clock frequency is out of supported range %d\n", + freq); ret = -ERANGE; goto out_m_can_class_free_dev; } @@ -334,6 +453,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi) priv->spi = spi; mcan_class->pm_clock_support = 0; + mcan_class->pm_wake_source = device_property_read_bool(&spi->dev, "wakeup-source"); mcan_class->can.clock.freq = freq; mcan_class->dev = &spi->dev; mcan_class->ops = &tcan4x5x_ops; @@ -345,28 +465,67 @@ static int tcan4x5x_can_probe(struct spi_device *spi) /* Configure the SPI bus */ spi->bits_per_word = 8; ret = spi_setup(spi); - if (ret) + if (ret) { + dev_err(&spi->dev, "SPI setup failed %pe\n", ERR_PTR(ret)); goto out_m_can_class_free_dev; + } ret = tcan4x5x_regmap_init(priv); - if (ret) + if (ret) { + dev_err(&spi->dev, "regmap init failed %pe\n", ERR_PTR(ret)); goto out_m_can_class_free_dev; + } ret = tcan4x5x_power_enable(priv->power, 1); - if (ret) + if (ret) { + dev_err(&spi->dev, "Enabling regulator failed %pe\n", + ERR_PTR(ret)); goto out_m_can_class_free_dev; + } ret = tcan4x5x_get_gpios(mcan_class); - if (ret) + if (ret) { + dev_err(&spi->dev, "Getting gpios failed %pe\n", ERR_PTR(ret)); goto out_power; + } - ret = tcan4x5x_init(mcan_class); - if (ret) + version_info = tcan4x5x_find_version(priv); + if (IS_ERR(version_info)) { + ret = PTR_ERR(version_info); + goto out_power; + } + + ret = tcan4x5x_check_gpios(mcan_class, version_info); + if (ret) { + dev_err(&spi->dev, "Checking gpios failed %pe\n", ERR_PTR(ret)); + goto out_power; + } + + tcan4x5x_get_dt_data(mcan_class); + + tcan4x5x_check_wake(priv); + + ret = tcan4x5x_write_tcan_reg(mcan_class, TCAN4X5X_INT_EN, 0); + if (ret) { + dev_err(&spi->dev, "Disabling interrupts failed %pe\n", ERR_PTR(ret)); + goto out_power; + } + + ret = tcan4x5x_clear_interrupts(mcan_class); + if (ret) { + dev_err(&spi->dev, "Clearing interrupts failed %pe\n", ERR_PTR(ret)); goto out_power; + } + + if (mcan_class->pm_wake_source) + device_init_wakeup(&spi->dev, true); ret = m_can_class_register(mcan_class); - if (ret) + if (ret) { + dev_err(&spi->dev, "Failed registering m_can device %pe\n", + ERR_PTR(ret)); goto out_power; + } netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n"); return 0; @@ -389,6 +548,29 @@ static void tcan4x5x_can_remove(struct spi_device *spi) m_can_class_free_dev(priv->cdev.net); } +static int __maybe_unused tcan4x5x_suspend(struct device *dev) +{ + struct m_can_classdev *cdev = dev_get_drvdata(dev); + struct spi_device *spi = to_spi_device(dev); + + if (cdev->pm_wake_source) + enable_irq_wake(spi->irq); + + return m_can_class_suspend(dev); +} + +static int __maybe_unused tcan4x5x_resume(struct device *dev) +{ + struct m_can_classdev *cdev = dev_get_drvdata(dev); + struct spi_device *spi = to_spi_device(dev); + int ret = m_can_class_resume(dev); + + if (cdev->pm_wake_source) + disable_irq_wake(spi->irq); + + return ret; +} + static const struct of_device_id tcan4x5x_of_match[] = { { .compatible = "ti,tcan4x5x", @@ -407,11 +589,15 @@ static const struct spi_device_id tcan4x5x_id_table[] = { }; MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); +static const struct dev_pm_ops tcan4x5x_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(tcan4x5x_suspend, tcan4x5x_resume) +}; + static struct spi_driver tcan4x5x_can_driver = { .driver = { .name = KBUILD_MODNAME, .of_match_table = tcan4x5x_of_match, - .pm = NULL, + .pm = &tcan4x5x_pm_ops, }, .id_table = tcan4x5x_id_table, .probe = tcan4x5x_can_probe, |