| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dan Murphy | 1489 | 88.00% | 7 | 28.00% |
| Marc Kleine-Budde | 97 | 5.73% | 10 | 40.00% |
| Sean Nyekjaer | 77 | 4.55% | 4 | 16.00% |
| Matt Kline | 21 | 1.24% | 1 | 4.00% |
| Markus Schneider-Pargmann | 6 | 0.35% | 1 | 4.00% |
| Uwe Kleine-König | 1 | 0.06% | 1 | 4.00% |
| Gustavo A. R. Silva | 1 | 0.06% | 1 | 4.00% |
| Total | 1692 | 25 |
// SPDX-License-Identifier: GPL-2.0 // SPI to CAN driver for the Texas Instruments TCAN4x5x // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/ #include "tcan4x5x.h" #define TCAN4X5X_EXT_CLK_DEF 40000000 #define TCAN4X5X_DEV_ID0 0x00 #define TCAN4X5X_DEV_ID1 0x04 #define TCAN4X5X_REV 0x08 #define TCAN4X5X_STATUS 0x0C #define TCAN4X5X_ERROR_STATUS_MASK 0x10 #define TCAN4X5X_CONTROL 0x14 #define TCAN4X5X_CONFIG 0x800 #define TCAN4X5X_TS_PRESCALE 0x804 #define TCAN4X5X_TEST_REG 0x808 #define TCAN4X5X_INT_FLAGS 0x820 #define TCAN4X5X_MCAN_INT_REG 0x824 #define TCAN4X5X_INT_EN 0x830 /* Interrupt bits */ #define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30) #define TCAN4X5X_CANHCANL_INT_EN BIT(29) #define TCAN4X5X_CANHBAT_INT_EN BIT(28) #define TCAN4X5X_CANLGND_INT_EN BIT(27) #define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26) #define TCAN4X5X_CANBUSGND_INT_EN BIT(25) #define TCAN4X5X_CANBUSBAT_INT_EN BIT(24) #define TCAN4X5X_UVSUP_INT_EN BIT(22) #define TCAN4X5X_UVIO_INT_EN BIT(21) #define TCAN4X5X_TSD_INT_EN BIT(19) #define TCAN4X5X_ECCERR_INT_EN BIT(16) #define TCAN4X5X_CANINT_INT_EN BIT(15) #define TCAN4X5X_LWU_INT_EN BIT(14) #define TCAN4X5X_CANSLNT_INT_EN BIT(10) #define TCAN4X5X_CANDOM_INT_EN BIT(8) #define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5) #define TCAN4X5X_BUS_FAULT BIT(4) #define TCAN4X5X_MCAN_INT BIT(1) #define TCAN4X5X_ENABLE_TCAN_INT \ (TCAN4X5X_MCAN_INT | TCAN4X5X_BUS_FAULT | \ TCAN4X5X_CANBUS_ERR_INT_EN | TCAN4X5X_CANINT_INT_EN) /* MCAN Interrupt bits */ #define TCAN4X5X_MCAN_IR_ARA BIT(29) #define TCAN4X5X_MCAN_IR_PED BIT(28) #define TCAN4X5X_MCAN_IR_PEA BIT(27) #define TCAN4X5X_MCAN_IR_WD BIT(26) #define TCAN4X5X_MCAN_IR_BO BIT(25) #define TCAN4X5X_MCAN_IR_EW BIT(24) #define TCAN4X5X_MCAN_IR_EP BIT(23) #define TCAN4X5X_MCAN_IR_ELO BIT(22) #define TCAN4X5X_MCAN_IR_BEU BIT(21) #define TCAN4X5X_MCAN_IR_BEC BIT(20) #define TCAN4X5X_MCAN_IR_DRX BIT(19) #define TCAN4X5X_MCAN_IR_TOO BIT(18) #define TCAN4X5X_MCAN_IR_MRAF BIT(17) #define TCAN4X5X_MCAN_IR_TSW BIT(16) #define TCAN4X5X_MCAN_IR_TEFL BIT(15) #define TCAN4X5X_MCAN_IR_TEFF BIT(14) #define TCAN4X5X_MCAN_IR_TEFW BIT(13) #define TCAN4X5X_MCAN_IR_TEFN BIT(12) #define TCAN4X5X_MCAN_IR_TFE BIT(11) #define TCAN4X5X_MCAN_IR_TCF BIT(10) #define TCAN4X5X_MCAN_IR_TC BIT(9) #define TCAN4X5X_MCAN_IR_HPM BIT(8) #define TCAN4X5X_MCAN_IR_RF1L BIT(7) #define TCAN4X5X_MCAN_IR_RF1F BIT(6) #define TCAN4X5X_MCAN_IR_RF1W BIT(5) #define TCAN4X5X_MCAN_IR_RF1N BIT(4) #define TCAN4X5X_MCAN_IR_RF0L BIT(3) #define TCAN4X5X_MCAN_IR_RF0F BIT(2) #define TCAN4X5X_MCAN_IR_RF0W BIT(1) #define TCAN4X5X_MCAN_IR_RF0N BIT(0) #define TCAN4X5X_ENABLE_MCAN_INT \ (TCAN4X5X_MCAN_IR_TC | TCAN4X5X_MCAN_IR_RF0N | \ TCAN4X5X_MCAN_IR_RF1N | TCAN4X5X_MCAN_IR_RF0F | \ TCAN4X5X_MCAN_IR_RF1F) #define TCAN4X5X_MRAM_START 0x8000 #define TCAN4X5X_MCAN_OFFSET 0x1000 #define TCAN4X5X_CLEAR_ALL_INT 0xffffffff #define TCAN4X5X_SET_ALL_INT 0xffffffff #define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6)) #define TCAN4X5X_MODE_SLEEP 0x00 #define TCAN4X5X_MODE_STANDBY BIT(6) #define TCAN4X5X_MODE_NORMAL BIT(7) #define TCAN4X5X_DISABLE_WAKE_MSK (BIT(31) | BIT(30)) #define TCAN4X5X_DISABLE_INH_MSK BIT(9) #define TCAN4X5X_SW_RESET BIT(2) #define TCAN4X5X_MCAN_CONFIGURED BIT(5) #define TCAN4X5X_WATCHDOG_EN BIT(3) #define TCAN4X5X_WD_60_MS_TIMER 0 #define TCAN4X5X_WD_600_MS_TIMER BIT(28) #define TCAN4X5X_WD_3_S_TIMER BIT(29) #define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29)) static inline struct tcan4x5x_priv *cdev_to_priv(struct m_can_classdev *cdev) { return container_of(cdev, struct tcan4x5x_priv, cdev); } static void tcan4x5x_check_wake(struct tcan4x5x_priv *priv) { int wake_state = 0; if (priv->device_state_gpio) wake_state = gpiod_get_value(priv->device_state_gpio); if (priv->device_wake_gpio && wake_state) { gpiod_set_value(priv->device_wake_gpio, 0); usleep_range(5, 50); gpiod_set_value(priv->device_wake_gpio, 1); } } static int tcan4x5x_reset(struct tcan4x5x_priv *priv) { int ret = 0; if (priv->reset_gpio) { gpiod_set_value(priv->reset_gpio, 1); /* tpulse_width minimum 30us */ usleep_range(30, 100); gpiod_set_value(priv->reset_gpio, 0); } else { ret = regmap_write(priv->regmap, TCAN4X5X_CONFIG, TCAN4X5X_SW_RESET); if (ret) return ret; } usleep_range(700, 1000); return ret; } static u32 tcan4x5x_read_reg(struct m_can_classdev *cdev, int reg) { struct tcan4x5x_priv *priv = cdev_to_priv(cdev); u32 val; regmap_read(priv->regmap, TCAN4X5X_MCAN_OFFSET + reg, &val); return val; } static int tcan4x5x_read_fifo(struct m_can_classdev *cdev, int addr_offset, void *val, size_t val_count) { struct tcan4x5x_priv *priv = cdev_to_priv(cdev); return regmap_bulk_read(priv->regmap, TCAN4X5X_MRAM_START + addr_offset, val, val_count); } static int tcan4x5x_write_reg(struct m_can_classdev *cdev, int reg, int val) { struct tcan4x5x_priv *priv = cdev_to_priv(cdev); return regmap_write(priv->regmap, TCAN4X5X_MCAN_OFFSET + reg, val); } static int tcan4x5x_write_fifo(struct m_can_classdev *cdev, int addr_offset, const void *val, size_t val_count) { struct tcan4x5x_priv *priv = cdev_to_priv(cdev); return regmap_bulk_write(priv->regmap, TCAN4X5X_MRAM_START + addr_offset, val, val_count); } static int tcan4x5x_power_enable(struct regulator *reg, int enable) { if (IS_ERR_OR_NULL(reg)) return 0; if (enable) return regulator_enable(reg); else return regulator_disable(reg); } static int tcan4x5x_write_tcan_reg(struct m_can_classdev *cdev, int reg, int val) { struct tcan4x5x_priv *priv = cdev_to_priv(cdev); return regmap_write(priv->regmap, reg, val); } static int tcan4x5x_clear_interrupts(struct m_can_classdev *cdev) { int ret; ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_STATUS, TCAN4X5X_CLEAR_ALL_INT); if (ret) return ret; return tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_FLAGS, TCAN4X5X_CLEAR_ALL_INT); } static int tcan4x5x_init(struct m_can_classdev *cdev) { struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); int ret; tcan4x5x_check_wake(tcan4x5x); ret = tcan4x5x_clear_interrupts(cdev); if (ret) return ret; ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_EN, TCAN4X5X_ENABLE_TCAN_INT); if (ret) return ret; ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_ERROR_STATUS_MASK, TCAN4X5X_CLEAR_ALL_INT); if (ret) return ret; ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL); if (ret) return ret; return ret; } static int tcan4x5x_disable_wake(struct m_can_classdev *cdev) { struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, TCAN4X5X_DISABLE_WAKE_MSK, 0x00); } static int tcan4x5x_disable_state(struct m_can_classdev *cdev) { struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev); return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG, TCAN4X5X_DISABLE_INH_MSK, 0x01); } 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); if (IS_ERR(tcan4x5x->device_wake_gpio)) { if (PTR_ERR(tcan4x5x->device_wake_gpio) == -EPROBE_DEFER) return -EPROBE_DEFER; tcan4x5x_disable_wake(cdev); } tcan4x5x->reset_gpio = devm_gpiod_get_optional(cdev->dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(tcan4x5x->reset_gpio)) tcan4x5x->reset_gpio = NULL; ret = tcan4x5x_reset(tcan4x5x); if (ret) return ret; tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev, "device-state", GPIOD_IN); if (IS_ERR(tcan4x5x->device_state_gpio)) { tcan4x5x->device_state_gpio = NULL; tcan4x5x_disable_state(cdev); } return 0; } static struct m_can_ops tcan4x5x_ops = { .init = tcan4x5x_init, .read_reg = tcan4x5x_read_reg, .write_reg = tcan4x5x_write_reg, .write_fifo = tcan4x5x_write_fifo, .read_fifo = tcan4x5x_read_fifo, .clear_interrupts = tcan4x5x_clear_interrupts, }; static int tcan4x5x_can_probe(struct spi_device *spi) { 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; 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 { priv->power = NULL; } m_can_class_get_clocks(mcan_class); if (IS_ERR(mcan_class->cclk)) { dev_err(&spi->dev, "no CAN clock source defined\n"); freq = TCAN4X5X_EXT_CLK_DEF; } else { freq = clk_get_rate(mcan_class->cclk); } /* Sanity check */ if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) { ret = -ERANGE; goto out_m_can_class_free_dev; } priv->spi = spi; mcan_class->pm_clock_support = 0; mcan_class->can.clock.freq = freq; mcan_class->dev = &spi->dev; mcan_class->ops = &tcan4x5x_ops; mcan_class->is_peripheral = true; mcan_class->net->irq = spi->irq; spi_set_drvdata(spi, priv); /* Configure the SPI bus */ spi->bits_per_word = 8; ret = spi_setup(spi); if (ret) goto out_m_can_class_free_dev; ret = tcan4x5x_regmap_init(priv); if (ret) goto out_m_can_class_free_dev; ret = tcan4x5x_power_enable(priv->power, 1); if (ret) goto out_m_can_class_free_dev; ret = tcan4x5x_get_gpios(mcan_class); if (ret) goto out_power; ret = tcan4x5x_init(mcan_class); if (ret) goto out_power; ret = m_can_class_register(mcan_class); if (ret) goto out_power; netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n"); return 0; out_power: tcan4x5x_power_enable(priv->power, 0); out_m_can_class_free_dev: m_can_class_free_dev(mcan_class->net); return ret; } static void tcan4x5x_can_remove(struct spi_device *spi) { struct tcan4x5x_priv *priv = spi_get_drvdata(spi); m_can_class_unregister(&priv->cdev); tcan4x5x_power_enable(priv->power, 0); m_can_class_free_dev(priv->cdev.net); } static const struct of_device_id tcan4x5x_of_match[] = { { .compatible = "ti,tcan4x5x", }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, tcan4x5x_of_match); static const struct spi_device_id tcan4x5x_id_table[] = { { .name = "tcan4x5x", }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table); static struct spi_driver tcan4x5x_can_driver = { .driver = { .name = KBUILD_MODNAME, .of_match_table = tcan4x5x_of_match, .pm = NULL, }, .id_table = tcan4x5x_id_table, .probe = tcan4x5x_can_probe, .remove = tcan4x5x_can_remove, }; module_spi_driver(tcan4x5x_can_driver); MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver"); MODULE_LICENSE("GPL v2");
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