| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Marc Kleine-Budde | 4235 | 52.76% | 46 | 42.99% |
| Dong Aisheng | 1071 | 13.34% | 3 | 2.80% |
| Pankaj Bansal | 920 | 11.46% | 7 | 6.54% |
| Stefan Agner | 269 | 3.35% | 2 | 1.87% |
| Zhu Yi | 227 | 2.83% | 6 | 5.61% |
| Hui Wang | 212 | 2.64% | 3 | 2.80% |
| Fabio Estevam | 138 | 1.72% | 6 | 5.61% |
| Joakim Zhang | 125 | 1.56% | 3 | 2.80% |
| Robin Holt | 115 | 1.43% | 3 | 2.80% |
| Eric Bénard | 113 | 1.41% | 1 | 0.93% |
| Andri Yngvason | 93 | 1.16% | 2 | 1.87% |
| Oleksij Rempel | 81 | 1.01% | 2 | 1.87% |
| Alexander Stein | 73 | 0.91% | 2 | 1.87% |
| Steffen Trumtrar | 73 | 0.91% | 1 | 0.93% |
| Wolfgang Grandegger | 59 | 0.74% | 3 | 2.80% |
| David Jander | 54 | 0.67% | 3 | 2.80% |
| Andreas Werner | 43 | 0.54% | 1 | 0.93% |
| Uwe Kleine-König | 31 | 0.39% | 2 | 1.87% |
| Fabio Baltieri | 29 | 0.36% | 1 | 0.93% |
| Sean Nyekjaer | 19 | 0.24% | 1 | 0.93% |
| Reuben Dowle | 18 | 0.22% | 1 | 0.93% |
| Wen Yang | 14 | 0.17% | 1 | 0.93% |
| Oliver Hartkopp | 7 | 0.09% | 2 | 1.87% |
| David S. Miller | 3 | 0.04% | 2 | 1.87% |
| Yue haibing | 2 | 0.02% | 1 | 0.93% |
| Axel Lin | 2 | 0.02% | 1 | 0.93% |
| Lucas Stach | 1 | 0.01% | 1 | 0.93% |
| Total | 8027 | 107 |
// SPDX-License-Identifier: GPL-2.0 // // flexcan.c - FLEXCAN CAN controller driver // // Copyright (c) 2005-2006 Varma Electronics Oy // Copyright (c) 2009 Sascha Hauer, Pengutronix // Copyright (c) 2010-2017 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de> // Copyright (c) 2014 David Jander, Protonic Holland // // Based on code originally by Andrey Volkov <avolkov@varma-el.com> #include <linux/netdevice.h> #include <linux/can.h> #include <linux/can/dev.h> #include <linux/can/error.h> #include <linux/can/led.h> #include <linux/can/rx-offload.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <linux/regmap.h> #define DRV_NAME "flexcan" /* 8 for RX fifo and 2 error handling */ #define FLEXCAN_NAPI_WEIGHT (8 + 2) /* FLEXCAN module configuration register (CANMCR) bits */ #define FLEXCAN_MCR_MDIS BIT(31) #define FLEXCAN_MCR_FRZ BIT(30) #define FLEXCAN_MCR_FEN BIT(29) #define FLEXCAN_MCR_HALT BIT(28) #define FLEXCAN_MCR_NOT_RDY BIT(27) #define FLEXCAN_MCR_WAK_MSK BIT(26) #define FLEXCAN_MCR_SOFTRST BIT(25) #define FLEXCAN_MCR_FRZ_ACK BIT(24) #define FLEXCAN_MCR_SUPV BIT(23) #define FLEXCAN_MCR_SLF_WAK BIT(22) #define FLEXCAN_MCR_WRN_EN BIT(21) #define FLEXCAN_MCR_LPM_ACK BIT(20) #define FLEXCAN_MCR_WAK_SRC BIT(19) #define FLEXCAN_MCR_DOZE BIT(18) #define FLEXCAN_MCR_SRX_DIS BIT(17) #define FLEXCAN_MCR_IRMQ BIT(16) #define FLEXCAN_MCR_LPRIO_EN BIT(13) #define FLEXCAN_MCR_AEN BIT(12) /* MCR_MAXMB: maximum used MBs is MAXMB + 1 */ #define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f) #define FLEXCAN_MCR_IDAM_A (0x0 << 8) #define FLEXCAN_MCR_IDAM_B (0x1 << 8) #define FLEXCAN_MCR_IDAM_C (0x2 << 8) #define FLEXCAN_MCR_IDAM_D (0x3 << 8) /* FLEXCAN control register (CANCTRL) bits */ #define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24) #define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22) #define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19) #define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16) #define FLEXCAN_CTRL_BOFF_MSK BIT(15) #define FLEXCAN_CTRL_ERR_MSK BIT(14) #define FLEXCAN_CTRL_CLK_SRC BIT(13) #define FLEXCAN_CTRL_LPB BIT(12) #define FLEXCAN_CTRL_TWRN_MSK BIT(11) #define FLEXCAN_CTRL_RWRN_MSK BIT(10) #define FLEXCAN_CTRL_SMP BIT(7) #define FLEXCAN_CTRL_BOFF_REC BIT(6) #define FLEXCAN_CTRL_TSYN BIT(5) #define FLEXCAN_CTRL_LBUF BIT(4) #define FLEXCAN_CTRL_LOM BIT(3) #define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07) #define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK) #define FLEXCAN_CTRL_ERR_STATE \ (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \ FLEXCAN_CTRL_BOFF_MSK) #define FLEXCAN_CTRL_ERR_ALL \ (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE) /* FLEXCAN control register 2 (CTRL2) bits */ #define FLEXCAN_CTRL2_ECRWRE BIT(29) #define FLEXCAN_CTRL2_WRMFRZ BIT(28) #define FLEXCAN_CTRL2_RFFN(x) (((x) & 0x0f) << 24) #define FLEXCAN_CTRL2_TASD(x) (((x) & 0x1f) << 19) #define FLEXCAN_CTRL2_MRP BIT(18) #define FLEXCAN_CTRL2_RRS BIT(17) #define FLEXCAN_CTRL2_EACEN BIT(16) /* FLEXCAN memory error control register (MECR) bits */ #define FLEXCAN_MECR_ECRWRDIS BIT(31) #define FLEXCAN_MECR_HANCEI_MSK BIT(19) #define FLEXCAN_MECR_FANCEI_MSK BIT(18) #define FLEXCAN_MECR_CEI_MSK BIT(16) #define FLEXCAN_MECR_HAERRIE BIT(15) #define FLEXCAN_MECR_FAERRIE BIT(14) #define FLEXCAN_MECR_EXTERRIE BIT(13) #define FLEXCAN_MECR_RERRDIS BIT(9) #define FLEXCAN_MECR_ECCDIS BIT(8) #define FLEXCAN_MECR_NCEFAFRZ BIT(7) /* FLEXCAN error and status register (ESR) bits */ #define FLEXCAN_ESR_TWRN_INT BIT(17) #define FLEXCAN_ESR_RWRN_INT BIT(16) #define FLEXCAN_ESR_BIT1_ERR BIT(15) #define FLEXCAN_ESR_BIT0_ERR BIT(14) #define FLEXCAN_ESR_ACK_ERR BIT(13) #define FLEXCAN_ESR_CRC_ERR BIT(12) #define FLEXCAN_ESR_FRM_ERR BIT(11) #define FLEXCAN_ESR_STF_ERR BIT(10) #define FLEXCAN_ESR_TX_WRN BIT(9) #define FLEXCAN_ESR_RX_WRN BIT(8) #define FLEXCAN_ESR_IDLE BIT(7) #define FLEXCAN_ESR_TXRX BIT(6) #define FLEXCAN_EST_FLT_CONF_SHIFT (4) #define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT) #define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT) #define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT) #define FLEXCAN_ESR_BOFF_INT BIT(2) #define FLEXCAN_ESR_ERR_INT BIT(1) #define FLEXCAN_ESR_WAK_INT BIT(0) #define FLEXCAN_ESR_ERR_BUS \ (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \ FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \ FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR) #define FLEXCAN_ESR_ERR_STATE \ (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT) #define FLEXCAN_ESR_ERR_ALL \ (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE) #define FLEXCAN_ESR_ALL_INT \ (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \ FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT | \ FLEXCAN_ESR_WAK_INT) /* FLEXCAN interrupt flag register (IFLAG) bits */ /* Errata ERR005829 step7: Reserve first valid MB */ #define FLEXCAN_TX_MB_RESERVED_OFF_FIFO 8 #define FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP 0 #define FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST (FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP + 1) #define FLEXCAN_IFLAG_MB(x) BIT((x) & 0x1f) #define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7) #define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6) #define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5) /* FLEXCAN message buffers */ #define FLEXCAN_MB_CODE_MASK (0xf << 24) #define FLEXCAN_MB_CODE_RX_BUSY_BIT (0x1 << 24) #define FLEXCAN_MB_CODE_RX_INACTIVE (0x0 << 24) #define FLEXCAN_MB_CODE_RX_EMPTY (0x4 << 24) #define FLEXCAN_MB_CODE_RX_FULL (0x2 << 24) #define FLEXCAN_MB_CODE_RX_OVERRUN (0x6 << 24) #define FLEXCAN_MB_CODE_RX_RANSWER (0xa << 24) #define FLEXCAN_MB_CODE_TX_INACTIVE (0x8 << 24) #define FLEXCAN_MB_CODE_TX_ABORT (0x9 << 24) #define FLEXCAN_MB_CODE_TX_DATA (0xc << 24) #define FLEXCAN_MB_CODE_TX_TANSWER (0xe << 24) #define FLEXCAN_MB_CNT_SRR BIT(22) #define FLEXCAN_MB_CNT_IDE BIT(21) #define FLEXCAN_MB_CNT_RTR BIT(20) #define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16) #define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff) #define FLEXCAN_TIMEOUT_US (250) /* FLEXCAN hardware feature flags * * Below is some version info we got: * SOC Version IP-Version Glitch- [TR]WRN_INT IRQ Err Memory err RTR re- * Filter? connected? Passive detection ception in MB * MX25 FlexCAN2 03.00.00.00 no no no no no * MX28 FlexCAN2 03.00.04.00 yes yes no no no * MX35 FlexCAN2 03.00.00.00 no no no no no * MX53 FlexCAN2 03.00.00.00 yes no no no no * MX6s FlexCAN3 10.00.12.00 yes yes no no yes * VF610 FlexCAN3 ? no yes no yes yes? * LS1021A FlexCAN2 03.00.04.00 no yes no no yes * * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected. */ #define FLEXCAN_QUIRK_BROKEN_WERR_STATE BIT(1) /* [TR]WRN_INT not connected */ #define FLEXCAN_QUIRK_DISABLE_RXFG BIT(2) /* Disable RX FIFO Global mask */ #define FLEXCAN_QUIRK_ENABLE_EACEN_RRS BIT(3) /* Enable EACEN and RRS bit in ctrl2 */ #define FLEXCAN_QUIRK_DISABLE_MECR BIT(4) /* Disable Memory error detection */ #define FLEXCAN_QUIRK_USE_OFF_TIMESTAMP BIT(5) /* Use timestamp based offloading */ #define FLEXCAN_QUIRK_BROKEN_PERR_STATE BIT(6) /* No interrupt for error passive */ #define FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN BIT(7) /* default to BE register access */ #define FLEXCAN_QUIRK_SETUP_STOP_MODE BIT(8) /* Setup stop mode to support wakeup */ /* Structure of the message buffer */ struct flexcan_mb { u32 can_ctrl; u32 can_id; u32 data[]; }; /* Structure of the hardware registers */ struct flexcan_regs { u32 mcr; /* 0x00 */ u32 ctrl; /* 0x04 */ u32 timer; /* 0x08 */ u32 _reserved1; /* 0x0c */ u32 rxgmask; /* 0x10 */ u32 rx14mask; /* 0x14 */ u32 rx15mask; /* 0x18 */ u32 ecr; /* 0x1c */ u32 esr; /* 0x20 */ u32 imask2; /* 0x24 */ u32 imask1; /* 0x28 */ u32 iflag2; /* 0x2c */ u32 iflag1; /* 0x30 */ union { /* 0x34 */ u32 gfwr_mx28; /* MX28, MX53 */ u32 ctrl2; /* MX6, VF610 */ }; u32 esr2; /* 0x38 */ u32 imeur; /* 0x3c */ u32 lrfr; /* 0x40 */ u32 crcr; /* 0x44 */ u32 rxfgmask; /* 0x48 */ u32 rxfir; /* 0x4c */ u32 _reserved3[12]; /* 0x50 */ u8 mb[2][512]; /* 0x80 */ /* FIFO-mode: * MB * 0x080...0x08f 0 RX message buffer * 0x090...0x0df 1-5 reserverd * 0x0e0...0x0ff 6-7 8 entry ID table * (mx25, mx28, mx35, mx53) * 0x0e0...0x2df 6-7..37 8..128 entry ID table * size conf'ed via ctrl2::RFFN * (mx6, vf610) */ u32 _reserved4[256]; /* 0x480 */ u32 rximr[64]; /* 0x880 */ u32 _reserved5[24]; /* 0x980 */ u32 gfwr_mx6; /* 0x9e0 - MX6 */ u32 _reserved6[63]; /* 0x9e4 */ u32 mecr; /* 0xae0 */ u32 erriar; /* 0xae4 */ u32 erridpr; /* 0xae8 */ u32 errippr; /* 0xaec */ u32 rerrar; /* 0xaf0 */ u32 rerrdr; /* 0xaf4 */ u32 rerrsynr; /* 0xaf8 */ u32 errsr; /* 0xafc */ }; struct flexcan_devtype_data { u32 quirks; /* quirks needed for different IP cores */ }; struct flexcan_stop_mode { struct regmap *gpr; u8 req_gpr; u8 req_bit; u8 ack_gpr; u8 ack_bit; }; struct flexcan_priv { struct can_priv can; struct can_rx_offload offload; struct device *dev; struct flexcan_regs __iomem *regs; struct flexcan_mb __iomem *tx_mb; struct flexcan_mb __iomem *tx_mb_reserved; u8 tx_mb_idx; u8 mb_count; u8 mb_size; u8 clk_src; /* clock source of CAN Protocol Engine */ u32 reg_ctrl_default; u32 reg_imask1_default; u32 reg_imask2_default; struct clk *clk_ipg; struct clk *clk_per; const struct flexcan_devtype_data *devtype_data; struct regulator *reg_xceiver; struct flexcan_stop_mode stm; /* Read and Write APIs */ u32 (*read)(void __iomem *addr); void (*write)(u32 val, void __iomem *addr); }; static const struct flexcan_devtype_data fsl_p1010_devtype_data = { .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE | FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN, }; static const struct flexcan_devtype_data fsl_imx25_devtype_data = { .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE | FLEXCAN_QUIRK_BROKEN_PERR_STATE, }; static const struct flexcan_devtype_data fsl_imx28_devtype_data = { .quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE, }; static const struct flexcan_devtype_data fsl_imx6q_devtype_data = { .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SETUP_STOP_MODE, }; static const struct flexcan_devtype_data fsl_vf610_devtype_data = { .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS | FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_BROKEN_PERR_STATE, }; static const struct flexcan_devtype_data fsl_ls1021a_r2_devtype_data = { .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS | FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP, }; static const struct can_bittiming_const flexcan_bittiming_const = { .name = DRV_NAME, .tseg1_min = 4, .tseg1_max = 16, .tseg2_min = 2, .tseg2_max = 8, .sjw_max = 4, .brp_min = 1, .brp_max = 256, .brp_inc = 1, }; /* FlexCAN module is essentially modelled as a little-endian IP in most * SoCs, i.e the registers as well as the message buffer areas are * implemented in a little-endian fashion. * * However there are some SoCs (e.g. LS1021A) which implement the FlexCAN * module in a big-endian fashion (i.e the registers as well as the * message buffer areas are implemented in a big-endian way). * * In addition, the FlexCAN module can be found on SoCs having ARM or * PPC cores. So, we need to abstract off the register read/write * functions, ensuring that these cater to all the combinations of module * endianness and underlying CPU endianness. */ static inline u32 flexcan_read_be(void __iomem *addr) { return ioread32be(addr); } static inline void flexcan_write_be(u32 val, void __iomem *addr) { iowrite32be(val, addr); } static inline u32 flexcan_read_le(void __iomem *addr) { return ioread32(addr); } static inline void flexcan_write_le(u32 val, void __iomem *addr) { iowrite32(val, addr); } static struct flexcan_mb __iomem *flexcan_get_mb(const struct flexcan_priv *priv, u8 mb_index) { u8 bank_size; bool bank; if (WARN_ON(mb_index >= priv->mb_count)) return NULL; bank_size = sizeof(priv->regs->mb[0]) / priv->mb_size; bank = mb_index >= bank_size; if (bank) mb_index -= bank_size; return (struct flexcan_mb __iomem *) (&priv->regs->mb[bank][priv->mb_size * mb_index]); } static void flexcan_enable_wakeup_irq(struct flexcan_priv *priv, bool enable) { struct flexcan_regs __iomem *regs = priv->regs; u32 reg_mcr; reg_mcr = priv->read(®s->mcr); if (enable) reg_mcr |= FLEXCAN_MCR_WAK_MSK; else reg_mcr &= ~FLEXCAN_MCR_WAK_MSK; priv->write(reg_mcr, ®s->mcr); } static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int ackval; u32 reg_mcr; reg_mcr = priv->read(®s->mcr); reg_mcr |= FLEXCAN_MCR_SLF_WAK; priv->write(reg_mcr, ®s->mcr); /* enable stop request */ regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr, 1 << priv->stm.req_bit, 1 << priv->stm.req_bit); /* get stop acknowledgment */ if (regmap_read_poll_timeout(priv->stm.gpr, priv->stm.ack_gpr, ackval, ackval & (1 << priv->stm.ack_bit), 0, FLEXCAN_TIMEOUT_US)) return -ETIMEDOUT; return 0; } static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int ackval; u32 reg_mcr; /* remove stop request */ regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr, 1 << priv->stm.req_bit, 0); /* get stop acknowledgment */ if (regmap_read_poll_timeout(priv->stm.gpr, priv->stm.ack_gpr, ackval, !(ackval & (1 << priv->stm.ack_bit)), 0, FLEXCAN_TIMEOUT_US)) return -ETIMEDOUT; reg_mcr = priv->read(®s->mcr); reg_mcr &= ~FLEXCAN_MCR_SLF_WAK; priv->write(reg_mcr, ®s->mcr); return 0; } static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; u32 reg_ctrl = (priv->reg_ctrl_default | FLEXCAN_CTRL_ERR_MSK); priv->write(reg_ctrl, ®s->ctrl); } static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; u32 reg_ctrl = (priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_MSK); priv->write(reg_ctrl, ®s->ctrl); } static int flexcan_clks_enable(const struct flexcan_priv *priv) { int err; err = clk_prepare_enable(priv->clk_ipg); if (err) return err; err = clk_prepare_enable(priv->clk_per); if (err) clk_disable_unprepare(priv->clk_ipg); return err; } static void flexcan_clks_disable(const struct flexcan_priv *priv) { clk_disable_unprepare(priv->clk_per); clk_disable_unprepare(priv->clk_ipg); } static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv) { if (!priv->reg_xceiver) return 0; return regulator_enable(priv->reg_xceiver); } static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv) { if (!priv->reg_xceiver) return 0; return regulator_disable(priv->reg_xceiver); } static int flexcan_chip_enable(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; u32 reg; reg = priv->read(®s->mcr); reg &= ~FLEXCAN_MCR_MDIS; priv->write(reg, ®s->mcr); while (timeout-- && (priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) udelay(10); if (priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK) return -ETIMEDOUT; return 0; } static int flexcan_chip_disable(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; u32 reg; reg = priv->read(®s->mcr); reg |= FLEXCAN_MCR_MDIS; priv->write(reg, ®s->mcr); while (timeout-- && !(priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) udelay(10); if (!(priv->read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)) return -ETIMEDOUT; return 0; } static int flexcan_chip_freeze(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate; u32 reg; reg = priv->read(®s->mcr); reg |= FLEXCAN_MCR_HALT; priv->write(reg, ®s->mcr); while (timeout-- && !(priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) udelay(100); if (!(priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) return -ETIMEDOUT; return 0; } static int flexcan_chip_unfreeze(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; u32 reg; reg = priv->read(®s->mcr); reg &= ~FLEXCAN_MCR_HALT; priv->write(reg, ®s->mcr); while (timeout-- && (priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)) udelay(10); if (priv->read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK) return -ETIMEDOUT; return 0; } static int flexcan_chip_softreset(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; unsigned int timeout = FLEXCAN_TIMEOUT_US / 10; priv->write(FLEXCAN_MCR_SOFTRST, ®s->mcr); while (timeout-- && (priv->read(®s->mcr) & FLEXCAN_MCR_SOFTRST)) udelay(10); if (priv->read(®s->mcr) & FLEXCAN_MCR_SOFTRST) return -ETIMEDOUT; return 0; } static int __flexcan_get_berr_counter(const struct net_device *dev, struct can_berr_counter *bec) { const struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; u32 reg = priv->read(®s->ecr); bec->txerr = (reg >> 0) & 0xff; bec->rxerr = (reg >> 8) & 0xff; return 0; } static int flexcan_get_berr_counter(const struct net_device *dev, struct can_berr_counter *bec) { const struct flexcan_priv *priv = netdev_priv(dev); int err; err = pm_runtime_get_sync(priv->dev); if (err < 0) return err; err = __flexcan_get_berr_counter(dev, bec); pm_runtime_put(priv->dev); return err; } static netdev_tx_t flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) { const struct flexcan_priv *priv = netdev_priv(dev); struct can_frame *cf = (struct can_frame *)skb->data; u32 can_id; u32 data; u32 ctrl = FLEXCAN_MB_CODE_TX_DATA | (cf->can_dlc << 16); int i; if (can_dropped_invalid_skb(dev, skb)) return NETDEV_TX_OK; netif_stop_queue(dev); if (cf->can_id & CAN_EFF_FLAG) { can_id = cf->can_id & CAN_EFF_MASK; ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR; } else { can_id = (cf->can_id & CAN_SFF_MASK) << 18; } if (cf->can_id & CAN_RTR_FLAG) ctrl |= FLEXCAN_MB_CNT_RTR; for (i = 0; i < cf->can_dlc; i += sizeof(u32)) { data = be32_to_cpup((__be32 *)&cf->data[i]); priv->write(data, &priv->tx_mb->data[i / sizeof(u32)]); } can_put_echo_skb(skb, dev, 0); priv->write(can_id, &priv->tx_mb->can_id); priv->write(ctrl, &priv->tx_mb->can_ctrl); /* Errata ERR005829 step8: * Write twice INACTIVE(0x8) code to first MB. */ priv->write(FLEXCAN_MB_CODE_TX_INACTIVE, &priv->tx_mb_reserved->can_ctrl); priv->write(FLEXCAN_MB_CODE_TX_INACTIVE, &priv->tx_mb_reserved->can_ctrl); return NETDEV_TX_OK; } static void flexcan_irq_bus_err(struct net_device *dev, u32 reg_esr) { struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; struct sk_buff *skb; struct can_frame *cf; bool rx_errors = false, tx_errors = false; u32 timestamp; int err; timestamp = priv->read(®s->timer) << 16; skb = alloc_can_err_skb(dev, &cf); if (unlikely(!skb)) return; cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; if (reg_esr & FLEXCAN_ESR_BIT1_ERR) { netdev_dbg(dev, "BIT1_ERR irq\n"); cf->data[2] |= CAN_ERR_PROT_BIT1; tx_errors = true; } if (reg_esr & FLEXCAN_ESR_BIT0_ERR) { netdev_dbg(dev, "BIT0_ERR irq\n"); cf->data[2] |= CAN_ERR_PROT_BIT0; tx_errors = true; } if (reg_esr & FLEXCAN_ESR_ACK_ERR) { netdev_dbg(dev, "ACK_ERR irq\n"); cf->can_id |= CAN_ERR_ACK; cf->data[3] = CAN_ERR_PROT_LOC_ACK; tx_errors = true; } if (reg_esr & FLEXCAN_ESR_CRC_ERR) { netdev_dbg(dev, "CRC_ERR irq\n"); cf->data[2] |= CAN_ERR_PROT_BIT; cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ; rx_errors = true; } if (reg_esr & FLEXCAN_ESR_FRM_ERR) { netdev_dbg(dev, "FRM_ERR irq\n"); cf->data[2] |= CAN_ERR_PROT_FORM; rx_errors = true; } if (reg_esr & FLEXCAN_ESR_STF_ERR) { netdev_dbg(dev, "STF_ERR irq\n"); cf->data[2] |= CAN_ERR_PROT_STUFF; rx_errors = true; } priv->can.can_stats.bus_error++; if (rx_errors) dev->stats.rx_errors++; if (tx_errors) dev->stats.tx_errors++; err = can_rx_offload_queue_sorted(&priv->offload, skb, timestamp); if (err) dev->stats.rx_fifo_errors++; } static void flexcan_irq_state(struct net_device *dev, u32 reg_esr) { struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; struct sk_buff *skb; struct can_frame *cf; enum can_state new_state, rx_state, tx_state; int flt; struct can_berr_counter bec; u32 timestamp; int err; timestamp = priv->read(®s->timer) << 16; flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ? CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE; rx_state = unlikely(reg_esr & FLEXCAN_ESR_RX_WRN) ? CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE; new_state = max(tx_state, rx_state); } else { __flexcan_get_berr_counter(dev, &bec); new_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ? CAN_STATE_ERROR_PASSIVE : CAN_STATE_BUS_OFF; rx_state = bec.rxerr >= bec.txerr ? new_state : 0; tx_state = bec.rxerr <= bec.txerr ? new_state : 0; } /* state hasn't changed */ if (likely(new_state == priv->can.state)) return; skb = alloc_can_err_skb(dev, &cf); if (unlikely(!skb)) return; can_change_state(dev, cf, tx_state, rx_state); if (unlikely(new_state == CAN_STATE_BUS_OFF)) can_bus_off(dev); err = can_rx_offload_queue_sorted(&priv->offload, skb, timestamp); if (err) dev->stats.rx_fifo_errors++; } static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload) { return container_of(offload, struct flexcan_priv, offload); } static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload, struct can_frame *cf, u32 *timestamp, unsigned int n) { struct flexcan_priv *priv = rx_offload_to_priv(offload); struct flexcan_regs __iomem *regs = priv->regs; struct flexcan_mb __iomem *mb; u32 reg_ctrl, reg_id, reg_iflag1; int i; mb = flexcan_get_mb(priv, n); if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) { u32 code; do { reg_ctrl = priv->read(&mb->can_ctrl); } while (reg_ctrl & FLEXCAN_MB_CODE_RX_BUSY_BIT); /* is this MB empty? */ code = reg_ctrl & FLEXCAN_MB_CODE_MASK; if ((code != FLEXCAN_MB_CODE_RX_FULL) && (code != FLEXCAN_MB_CODE_RX_OVERRUN)) return 0; if (code == FLEXCAN_MB_CODE_RX_OVERRUN) { /* This MB was overrun, we lost data */ offload->dev->stats.rx_over_errors++; offload->dev->stats.rx_errors++; } } else { reg_iflag1 = priv->read(®s->iflag1); if (!(reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE)) return 0; reg_ctrl = priv->read(&mb->can_ctrl); } /* increase timstamp to full 32 bit */ *timestamp = reg_ctrl << 16; reg_id = priv->read(&mb->can_id); if (reg_ctrl & FLEXCAN_MB_CNT_IDE) cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG; else cf->can_id = (reg_id >> 18) & CAN_SFF_MASK; if (reg_ctrl & FLEXCAN_MB_CNT_RTR) cf->can_id |= CAN_RTR_FLAG; cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf); for (i = 0; i < cf->can_dlc; i += sizeof(u32)) { __be32 data = cpu_to_be32(priv->read(&mb->data[i / sizeof(u32)])); *(__be32 *)(cf->data + i) = data; } /* mark as read */ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) { /* Clear IRQ */ if (n < 32) priv->write(BIT(n), ®s->iflag1); else priv->write(BIT(n - 32), ®s->iflag2); } else { priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); } /* Read the Free Running Timer. It is optional but recommended * to unlock Mailbox as soon as possible and make it available * for reception. */ priv->read(®s->timer); return 1; } static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; u32 iflag1, iflag2; iflag2 = priv->read(®s->iflag2) & priv->reg_imask2_default & ~FLEXCAN_IFLAG_MB(priv->tx_mb_idx); iflag1 = priv->read(®s->iflag1) & priv->reg_imask1_default; return (u64)iflag2 << 32 | iflag1; } static irqreturn_t flexcan_irq(int irq, void *dev_id) { struct net_device *dev = dev_id; struct net_device_stats *stats = &dev->stats; struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; irqreturn_t handled = IRQ_NONE; u32 reg_iflag2, reg_esr; enum can_state last_state = priv->can.state; /* reception interrupt */ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) { u64 reg_iflag; int ret; while ((reg_iflag = flexcan_read_reg_iflag_rx(priv))) { handled = IRQ_HANDLED; ret = can_rx_offload_irq_offload_timestamp(&priv->offload, reg_iflag); if (!ret) break; } } else { u32 reg_iflag1; reg_iflag1 = priv->read(®s->iflag1); if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) { handled = IRQ_HANDLED; can_rx_offload_irq_offload_fifo(&priv->offload); } /* FIFO overflow interrupt */ if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) { handled = IRQ_HANDLED; priv->write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1); dev->stats.rx_over_errors++; dev->stats.rx_errors++; } } reg_iflag2 = priv->read(®s->iflag2); /* transmission complete interrupt */ if (reg_iflag2 & FLEXCAN_IFLAG_MB(priv->tx_mb_idx)) { u32 reg_ctrl = priv->read(&priv->tx_mb->can_ctrl); handled = IRQ_HANDLED; stats->tx_bytes += can_rx_offload_get_echo_skb(&priv->offload, 0, reg_ctrl << 16); stats->tx_packets++; can_led_event(dev, CAN_LED_EVENT_TX); /* after sending a RTR frame MB is in RX mode */ priv->write(FLEXCAN_MB_CODE_TX_INACTIVE, &priv->tx_mb->can_ctrl); priv->write(FLEXCAN_IFLAG_MB(priv->tx_mb_idx), ®s->iflag2); netif_wake_queue(dev); } reg_esr = priv->read(®s->esr); /* ACK all bus error and state change IRQ sources */ if (reg_esr & FLEXCAN_ESR_ALL_INT) { handled = IRQ_HANDLED; priv->write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr); } /* state change interrupt or broken error state quirk fix is enabled */ if ((reg_esr & FLEXCAN_ESR_ERR_STATE) || (priv->devtype_data->quirks & (FLEXCAN_QUIRK_BROKEN_WERR_STATE | FLEXCAN_QUIRK_BROKEN_PERR_STATE))) flexcan_irq_state(dev, reg_esr); /* bus error IRQ - handle if bus error reporting is activated */ if ((reg_esr & FLEXCAN_ESR_ERR_BUS) && (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) flexcan_irq_bus_err(dev, reg_esr); /* availability of error interrupt among state transitions in case * bus error reporting is de-activated and * FLEXCAN_QUIRK_BROKEN_PERR_STATE is enabled: * +--------------------------------------------------------------+ * | +----------------------------------------------+ [stopped / | * | | | sleeping] -+ * +-+-> active <-> warning <-> passive -> bus off -+ * ___________^^^^^^^^^^^^_______________________________ * disabled(1) enabled disabled * * (1): enabled if FLEXCAN_QUIRK_BROKEN_WERR_STATE is enabled */ if ((last_state != priv->can.state) && (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_PERR_STATE) && !(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) { switch (priv->can.state) { case CAN_STATE_ERROR_ACTIVE: if (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE) flexcan_error_irq_enable(priv); else flexcan_error_irq_disable(priv); break; case CAN_STATE_ERROR_WARNING: flexcan_error_irq_enable(priv); break; case CAN_STATE_ERROR_PASSIVE: case CAN_STATE_BUS_OFF: flexcan_error_irq_disable(priv); break; default: break; } } return handled; } static void flexcan_set_bittiming(struct net_device *dev) { const struct flexcan_priv *priv = netdev_priv(dev); const struct can_bittiming *bt = &priv->can.bittiming; struct flexcan_regs __iomem *regs = priv->regs; u32 reg; reg = priv->read(®s->ctrl); reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) | FLEXCAN_CTRL_RJW(0x3) | FLEXCAN_CTRL_PSEG1(0x7) | FLEXCAN_CTRL_PSEG2(0x7) | FLEXCAN_CTRL_PROPSEG(0x7) | FLEXCAN_CTRL_LPB | FLEXCAN_CTRL_SMP | FLEXCAN_CTRL_LOM); reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) | FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) | FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) | FLEXCAN_CTRL_RJW(bt->sjw - 1) | FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1); if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) reg |= FLEXCAN_CTRL_LPB; if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) reg |= FLEXCAN_CTRL_LOM; if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) reg |= FLEXCAN_CTRL_SMP; netdev_dbg(dev, "writing ctrl=0x%08x\n", reg); priv->write(reg, ®s->ctrl); /* print chip status */ netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__, priv->read(®s->mcr), priv->read(®s->ctrl)); } /* flexcan_chip_start * * this functions is entered with clocks enabled * */ static int flexcan_chip_start(struct net_device *dev) { struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; u32 reg_mcr, reg_ctrl, reg_ctrl2, reg_mecr; int err, i; struct flexcan_mb __iomem *mb; /* enable module */ err = flexcan_chip_enable(priv); if (err) return err; /* soft reset */ err = flexcan_chip_softreset(priv); if (err) goto out_chip_disable; flexcan_set_bittiming(dev); /* MCR * * enable freeze * halt now * only supervisor access * enable warning int * enable individual RX masking * choose format C * set max mailbox number */ reg_mcr = priv->read(®s->mcr); reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff); reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | FLEXCAN_MCR_IRMQ | FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_MAXMB(priv->tx_mb_idx); /* MCR * * FIFO: * - disable for timestamp mode * - enable for FIFO mode */ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) reg_mcr &= ~FLEXCAN_MCR_FEN; else reg_mcr |= FLEXCAN_MCR_FEN; /* MCR * * NOTE: In loopback mode, the CAN_MCR[SRXDIS] cannot be * asserted because this will impede the self reception * of a transmitted message. This is not documented in * earlier versions of flexcan block guide. * * Self Reception: * - enable Self Reception for loopback mode * (by clearing "Self Reception Disable" bit) * - disable for normal operation */ if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) reg_mcr &= ~FLEXCAN_MCR_SRX_DIS; else reg_mcr |= FLEXCAN_MCR_SRX_DIS; netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr); priv->write(reg_mcr, ®s->mcr); /* CTRL * * disable timer sync feature * * disable auto busoff recovery * transmit lowest buffer first * * enable tx and rx warning interrupt * enable bus off interrupt * (== FLEXCAN_CTRL_ERR_STATE) */ reg_ctrl = priv->read(®s->ctrl); reg_ctrl &= ~FLEXCAN_CTRL_TSYN; reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF | FLEXCAN_CTRL_ERR_STATE; /* enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK), * on most Flexcan cores, too. Otherwise we don't get * any error warning or passive interrupts. */ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE || priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) reg_ctrl |= FLEXCAN_CTRL_ERR_MSK; else reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK; /* save for later use */ priv->reg_ctrl_default = reg_ctrl; /* leave interrupts disabled for now */ reg_ctrl &= ~FLEXCAN_CTRL_ERR_ALL; netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl); priv->write(reg_ctrl, ®s->ctrl); if ((priv->devtype_data->quirks & FLEXCAN_QUIRK_ENABLE_EACEN_RRS)) { reg_ctrl2 = priv->read(®s->ctrl2); reg_ctrl2 |= FLEXCAN_CTRL2_EACEN | FLEXCAN_CTRL2_RRS; priv->write(reg_ctrl2, ®s->ctrl2); } if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) { for (i = priv->offload.mb_first; i <= priv->offload.mb_last; i++) { mb = flexcan_get_mb(priv, i); priv->write(FLEXCAN_MB_CODE_RX_EMPTY, &mb->can_ctrl); } } else { /* clear and invalidate unused mailboxes first */ for (i = FLEXCAN_TX_MB_RESERVED_OFF_FIFO; i < priv->mb_count; i++) { mb = flexcan_get_mb(priv, i); priv->write(FLEXCAN_MB_CODE_RX_INACTIVE, &mb->can_ctrl); } } /* Errata ERR005829: mark first TX mailbox as INACTIVE */ priv->write(FLEXCAN_MB_CODE_TX_INACTIVE, &priv->tx_mb_reserved->can_ctrl); /* mark TX mailbox as INACTIVE */ priv->write(FLEXCAN_MB_CODE_TX_INACTIVE, &priv->tx_mb->can_ctrl); /* acceptance mask/acceptance code (accept everything) */ priv->write(0x0, ®s->rxgmask); priv->write(0x0, ®s->rx14mask); priv->write(0x0, ®s->rx15mask); if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_RXFG) priv->write(0x0, ®s->rxfgmask); /* clear acceptance filters */ for (i = 0; i < priv->mb_count; i++) priv->write(0, ®s->rximr[i]); /* On Vybrid, disable memory error detection interrupts * and freeze mode. * This also works around errata e5295 which generates * false positive memory errors and put the device in * freeze mode. */ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_MECR) { /* Follow the protocol as described in "Detection * and Correction of Memory Errors" to write to * MECR register */ reg_ctrl2 = priv->read(®s->ctrl2); reg_ctrl2 |= FLEXCAN_CTRL2_ECRWRE; priv->write(reg_ctrl2, ®s->ctrl2); reg_mecr = priv->read(®s->mecr); reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS; priv->write(reg_mecr, ®s->mecr); reg_mecr |= FLEXCAN_MECR_ECCDIS; reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK | FLEXCAN_MECR_FANCEI_MSK); priv->write(reg_mecr, ®s->mecr); } err = flexcan_transceiver_enable(priv); if (err) goto out_chip_disable; /* synchronize with the can bus */ err = flexcan_chip_unfreeze(priv); if (err) goto out_transceiver_disable; priv->can.state = CAN_STATE_ERROR_ACTIVE; /* enable interrupts atomically */ disable_irq(dev->irq); priv->write(priv->reg_ctrl_default, ®s->ctrl); priv->write(priv->reg_imask1_default, ®s->imask1); priv->write(priv->reg_imask2_default, ®s->imask2); enable_irq(dev->irq); /* print chip status */ netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__, priv->read(®s->mcr), priv->read(®s->ctrl)); return 0; out_transceiver_disable: flexcan_transceiver_disable(priv); out_chip_disable: flexcan_chip_disable(priv); return err; } /* flexcan_chip_stop * * this functions is entered with clocks enabled */ static void flexcan_chip_stop(struct net_device *dev) { struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; /* freeze + disable module */ flexcan_chip_freeze(priv); flexcan_chip_disable(priv); /* Disable all interrupts */ priv->write(0, ®s->imask2); priv->write(0, ®s->imask1); priv->write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, ®s->ctrl); flexcan_transceiver_disable(priv); priv->can.state = CAN_STATE_STOPPED; } static int flexcan_open(struct net_device *dev) { struct flexcan_priv *priv = netdev_priv(dev); int err; err = pm_runtime_get_sync(priv->dev); if (err < 0) return err; err = open_candev(dev); if (err) goto out_runtime_put; err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev); if (err) goto out_close; priv->mb_size = sizeof(struct flexcan_mb) + CAN_MAX_DLEN; priv->mb_count = (sizeof(priv->regs->mb[0]) / priv->mb_size) + (sizeof(priv->regs->mb[1]) / priv->mb_size); if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) priv->tx_mb_reserved = flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP); else priv->tx_mb_reserved = flexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_OFF_FIFO); priv->tx_mb_idx = priv->mb_count - 1; priv->tx_mb = flexcan_get_mb(priv, priv->tx_mb_idx); priv->reg_imask1_default = 0; priv->reg_imask2_default = FLEXCAN_IFLAG_MB(priv->tx_mb_idx); priv->offload.mailbox_read = flexcan_mailbox_read; if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) { u64 imask; priv->offload.mb_first = FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST; priv->offload.mb_last = priv->mb_count - 2; imask = GENMASK_ULL(priv->offload.mb_last, priv->offload.mb_first); priv->reg_imask1_default |= imask; priv->reg_imask2_default |= imask >> 32; err = can_rx_offload_add_timestamp(dev, &priv->offload); } else { priv->reg_imask1_default |= FLEXCAN_IFLAG_RX_FIFO_OVERFLOW | FLEXCAN_IFLAG_RX_FIFO_AVAILABLE; err = can_rx_offload_add_fifo(dev, &priv->offload, FLEXCAN_NAPI_WEIGHT); } if (err) goto out_free_irq; /* start chip and queuing */ err = flexcan_chip_start(dev); if (err) goto out_offload_del; can_led_event(dev, CAN_LED_EVENT_OPEN); can_rx_offload_enable(&priv->offload); netif_start_queue(dev); return 0; out_offload_del: can_rx_offload_del(&priv->offload); out_free_irq: free_irq(dev->irq, dev); out_close: close_candev(dev); out_runtime_put: pm_runtime_put(priv->dev); return err; } static int flexcan_close(struct net_device *dev) { struct flexcan_priv *priv = netdev_priv(dev); netif_stop_queue(dev); can_rx_offload_disable(&priv->offload); flexcan_chip_stop(dev); can_rx_offload_del(&priv->offload); free_irq(dev->irq, dev); close_candev(dev); pm_runtime_put(priv->dev); can_led_event(dev, CAN_LED_EVENT_STOP); return 0; } static int flexcan_set_mode(struct net_device *dev, enum can_mode mode) { int err; switch (mode) { case CAN_MODE_START: err = flexcan_chip_start(dev); if (err) return err; netif_wake_queue(dev); break; default: return -EOPNOTSUPP; } return 0; } static const struct net_device_ops flexcan_netdev_ops = { .ndo_open = flexcan_open, .ndo_stop = flexcan_close, .ndo_start_xmit = flexcan_start_xmit, .ndo_change_mtu = can_change_mtu, }; static int register_flexcandev(struct net_device *dev) { struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->regs; u32 reg, err; err = flexcan_clks_enable(priv); if (err) return err; /* select "bus clock", chip must be disabled */ err = flexcan_chip_disable(priv); if (err) goto out_clks_disable; reg = priv->read(®s->ctrl); if (priv->clk_src) reg |= FLEXCAN_CTRL_CLK_SRC; else reg &= ~FLEXCAN_CTRL_CLK_SRC; priv->write(reg, ®s->ctrl); err = flexcan_chip_enable(priv); if (err) goto out_chip_disable; /* set freeze, halt and activate FIFO, restrict register access */ reg = priv->read(®s->mcr); reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV; priv->write(reg, ®s->mcr); /* Currently we only support newer versions of this core * featuring a RX hardware FIFO (although this driver doesn't * make use of it on some cores). Older cores, found on some * Coldfire derivates are not tested. */ reg = priv->read(®s->mcr); if (!(reg & FLEXCAN_MCR_FEN)) { netdev_err(dev, "Could not enable RX FIFO, unsupported core\n"); err = -ENODEV; goto out_chip_disable; } err = register_candev(dev); if (err) goto out_chip_disable; /* Disable core and let pm_runtime_put() disable the clocks. * If CONFIG_PM is not enabled, the clocks will stay powered. */ flexcan_chip_disable(priv); pm_runtime_put(priv->dev); return 0; out_chip_disable: flexcan_chip_disable(priv); out_clks_disable: flexcan_clks_disable(priv); return err; } static void unregister_flexcandev(struct net_device *dev) { unregister_candev(dev); } static int flexcan_setup_stop_mode(struct platform_device *pdev) { struct net_device *dev = platform_get_drvdata(pdev); struct device_node *np = pdev->dev.of_node; struct device_node *gpr_np; struct flexcan_priv *priv; phandle phandle; u32 out_val[5]; int ret; if (!np) return -EINVAL; /* stop mode property format is: * <&gpr req_gpr req_bit ack_gpr ack_bit>. */ ret = of_property_read_u32_array(np, "fsl,stop-mode", out_val, ARRAY_SIZE(out_val)); if (ret) { dev_dbg(&pdev->dev, "no stop-mode property\n"); return ret; } phandle = *out_val; gpr_np = of_find_node_by_phandle(phandle); if (!gpr_np) { dev_dbg(&pdev->dev, "could not find gpr node by phandle\n"); return -ENODEV; } priv = netdev_priv(dev); priv->stm.gpr = syscon_node_to_regmap(gpr_np); if (IS_ERR(priv->stm.gpr)) { dev_dbg(&pdev->dev, "could not find gpr regmap\n"); ret = PTR_ERR(priv->stm.gpr); goto out_put_node; } priv->stm.req_gpr = out_val[1]; priv->stm.req_bit = out_val[2]; priv->stm.ack_gpr = out_val[3]; priv->stm.ack_bit = out_val[4]; dev_dbg(&pdev->dev, "gpr %s req_gpr=0x02%x req_bit=%u ack_gpr=0x02%x ack_bit=%u\n", gpr_np->full_name, priv->stm.req_gpr, priv->stm.req_bit, priv->stm.ack_gpr, priv->stm.ack_bit); device_set_wakeup_capable(&pdev->dev, true); if (of_property_read_bool(np, "wakeup-source")) device_set_wakeup_enable(&pdev->dev, true); return 0; out_put_node: of_node_put(gpr_np); return ret; } static const struct of_device_id flexcan_of_match[] = { { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, }, { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, }, { .compatible = "fsl,imx53-flexcan", .data = &fsl_imx25_devtype_data, }, { .compatible = "fsl,imx35-flexcan", .data = &fsl_imx25_devtype_data, }, { .compatible = "fsl,imx25-flexcan", .data = &fsl_imx25_devtype_data, }, { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, }, { .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, }, { .compatible = "fsl,ls1021ar2-flexcan", .data = &fsl_ls1021a_r2_devtype_data, }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, flexcan_of_match); static const struct platform_device_id flexcan_id_table[] = { { .name = "flexcan", .driver_data = (kernel_ulong_t)&fsl_p1010_devtype_data, }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(platform, flexcan_id_table); static int flexcan_probe(struct platform_device *pdev) { const struct of_device_id *of_id; const struct flexcan_devtype_data *devtype_data; struct net_device *dev; struct flexcan_priv *priv; struct regulator *reg_xceiver; struct resource *mem; struct clk *clk_ipg = NULL, *clk_per = NULL; struct flexcan_regs __iomem *regs; int err, irq; u8 clk_src = 1; u32 clock_freq = 0; reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver"); if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER) return -EPROBE_DEFER; else if (IS_ERR(reg_xceiver)) reg_xceiver = NULL; if (pdev->dev.of_node) { of_property_read_u32(pdev->dev.of_node, "clock-frequency", &clock_freq); of_property_read_u8(pdev->dev.of_node, "fsl,clk-source", &clk_src); } if (!clock_freq) { clk_ipg = devm_clk_get(&pdev->dev, "ipg"); if (IS_ERR(clk_ipg)) { dev_err(&pdev->dev, "no ipg clock defined\n"); return PTR_ERR(clk_ipg); } clk_per = devm_clk_get(&pdev->dev, "per"); if (IS_ERR(clk_per)) { dev_err(&pdev->dev, "no per clock defined\n"); return PTR_ERR(clk_per); } clock_freq = clk_get_rate(clk_per); } mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_irq(pdev, 0); if (irq <= 0) return -ENODEV; regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(regs)) return PTR_ERR(regs); of_id = of_match_device(flexcan_of_match, &pdev->dev); if (of_id) { devtype_data = of_id->data; } else if (platform_get_device_id(pdev)->driver_data) { devtype_data = (struct flexcan_devtype_data *) platform_get_device_id(pdev)->driver_data; } else { return -ENODEV; } dev = alloc_candev(sizeof(struct flexcan_priv), 1); if (!dev) return -ENOMEM; platform_set_drvdata(pdev, dev); SET_NETDEV_DEV(dev, &pdev->dev); dev->netdev_ops = &flexcan_netdev_ops; dev->irq = irq; dev->flags |= IFF_ECHO; priv = netdev_priv(dev); if (of_property_read_bool(pdev->dev.of_node, "big-endian") || devtype_data->quirks & FLEXCAN_QUIRK_DEFAULT_BIG_ENDIAN) { priv->read = flexcan_read_be; priv->write = flexcan_write_be; } else { priv->read = flexcan_read_le; priv->write = flexcan_write_le; } priv->dev = &pdev->dev; priv->can.clock.freq = clock_freq; priv->can.bittiming_const = &flexcan_bittiming_const; priv->can.do_set_mode = flexcan_set_mode; priv->can.do_get_berr_counter = flexcan_get_berr_counter; priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_BERR_REPORTING; priv->regs = regs; priv->clk_ipg = clk_ipg; priv->clk_per = clk_per; priv->clk_src = clk_src; priv->devtype_data = devtype_data; priv->reg_xceiver = reg_xceiver; pm_runtime_get_noresume(&pdev->dev); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); err = register_flexcandev(dev); if (err) { dev_err(&pdev->dev, "registering netdev failed\n"); goto failed_register; } devm_can_led_init(dev); if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE) { err = flexcan_setup_stop_mode(pdev); if (err) dev_dbg(&pdev->dev, "failed to setup stop-mode\n"); } return 0; failed_register: free_candev(dev); return err; } static int flexcan_remove(struct platform_device *pdev) { struct net_device *dev = platform_get_drvdata(pdev); unregister_flexcandev(dev); pm_runtime_disable(&pdev->dev); free_candev(dev); return 0; } static int __maybe_unused flexcan_suspend(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); int err = 0; if (netif_running(dev)) { /* if wakeup is enabled, enter stop mode * else enter disabled mode. */ if (device_may_wakeup(device)) { enable_irq_wake(dev->irq); err = flexcan_enter_stop_mode(priv); if (err) return err; } else { err = flexcan_chip_disable(priv); if (err) return err; err = pm_runtime_force_suspend(device); } netif_stop_queue(dev); netif_device_detach(dev); } priv->can.state = CAN_STATE_SLEEPING; return err; } static int __maybe_unused flexcan_resume(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); int err = 0; priv->can.state = CAN_STATE_ERROR_ACTIVE; if (netif_running(dev)) { netif_device_attach(dev); netif_start_queue(dev); if (device_may_wakeup(device)) { disable_irq_wake(dev->irq); } else { err = pm_runtime_force_resume(device); if (err) return err; err = flexcan_chip_enable(priv); } } return err; } static int __maybe_unused flexcan_runtime_suspend(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); flexcan_clks_disable(priv); return 0; } static int __maybe_unused flexcan_runtime_resume(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); return flexcan_clks_enable(priv); } static int __maybe_unused flexcan_noirq_suspend(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); if (netif_running(dev) && device_may_wakeup(device)) flexcan_enable_wakeup_irq(priv, true); return 0; } static int __maybe_unused flexcan_noirq_resume(struct device *device) { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); int err; if (netif_running(dev) && device_may_wakeup(device)) { flexcan_enable_wakeup_irq(priv, false); err = flexcan_exit_stop_mode(priv); if (err) return err; } return 0; } static const struct dev_pm_ops flexcan_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(flexcan_suspend, flexcan_resume) SET_RUNTIME_PM_OPS(flexcan_runtime_suspend, flexcan_runtime_resume, NULL) SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(flexcan_noirq_suspend, flexcan_noirq_resume) }; static struct platform_driver flexcan_driver = { .driver = { .name = DRV_NAME, .pm = &flexcan_pm_ops, .of_match_table = flexcan_of_match, }, .probe = flexcan_probe, .remove = flexcan_remove, .id_table = flexcan_id_table, }; module_platform_driver(flexcan_driver); MODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, " "Marc Kleine-Budde <kernel@pengutronix.de>"); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("CAN port driver for flexcan based chip");
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