| /* |
| * CAN bus driver for Bosch C_CAN controller |
| * |
| * Copyright (C) 2010 ST Microelectronics |
| * Bhupesh Sharma <bhupesh.sharma@st.com> |
| * |
| * Borrowed heavily from the C_CAN driver originally written by: |
| * Copyright (C) 2007 |
| * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de> |
| * - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch> |
| * |
| * Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B. |
| * Bosch C_CAN user manual can be obtained from: |
| * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/ |
| * users_manual_c_can.pdf |
| * |
| * This file is licensed under the terms of the GNU General Public |
| * License version 2. This program is licensed "as is" without any |
| * warranty of any kind, whether express or implied. |
| */ |
| |
| #ifndef C_CAN_H |
| #define C_CAN_H |
| |
| enum reg { |
| C_CAN_CTRL_REG = 0, |
| C_CAN_CTRL_EX_REG, |
| C_CAN_STS_REG, |
| C_CAN_ERR_CNT_REG, |
| C_CAN_BTR_REG, |
| C_CAN_INT_REG, |
| C_CAN_TEST_REG, |
| C_CAN_BRPEXT_REG, |
| C_CAN_IF1_COMREQ_REG, |
| C_CAN_IF1_COMMSK_REG, |
| C_CAN_IF1_MASK1_REG, |
| C_CAN_IF1_MASK2_REG, |
| C_CAN_IF1_ARB1_REG, |
| C_CAN_IF1_ARB2_REG, |
| C_CAN_IF1_MSGCTRL_REG, |
| C_CAN_IF1_DATA1_REG, |
| C_CAN_IF1_DATA2_REG, |
| C_CAN_IF1_DATA3_REG, |
| C_CAN_IF1_DATA4_REG, |
| C_CAN_IF2_COMREQ_REG, |
| C_CAN_IF2_COMMSK_REG, |
| C_CAN_IF2_MASK1_REG, |
| C_CAN_IF2_MASK2_REG, |
| C_CAN_IF2_ARB1_REG, |
| C_CAN_IF2_ARB2_REG, |
| C_CAN_IF2_MSGCTRL_REG, |
| C_CAN_IF2_DATA1_REG, |
| C_CAN_IF2_DATA2_REG, |
| C_CAN_IF2_DATA3_REG, |
| C_CAN_IF2_DATA4_REG, |
| C_CAN_TXRQST1_REG, |
| C_CAN_TXRQST2_REG, |
| C_CAN_NEWDAT1_REG, |
| C_CAN_NEWDAT2_REG, |
| C_CAN_INTPND1_REG, |
| C_CAN_INTPND2_REG, |
| C_CAN_INTPND3_REG, |
| C_CAN_MSGVAL1_REG, |
| C_CAN_MSGVAL2_REG, |
| C_CAN_FUNCTION_REG, |
| }; |
| |
| static const u16 __maybe_unused reg_map_c_can[] = { |
| [C_CAN_CTRL_REG] = 0x00, |
| [C_CAN_STS_REG] = 0x02, |
| [C_CAN_ERR_CNT_REG] = 0x04, |
| [C_CAN_BTR_REG] = 0x06, |
| [C_CAN_INT_REG] = 0x08, |
| [C_CAN_TEST_REG] = 0x0A, |
| [C_CAN_BRPEXT_REG] = 0x0C, |
| [C_CAN_IF1_COMREQ_REG] = 0x10, |
| [C_CAN_IF1_COMMSK_REG] = 0x12, |
| [C_CAN_IF1_MASK1_REG] = 0x14, |
| [C_CAN_IF1_MASK2_REG] = 0x16, |
| [C_CAN_IF1_ARB1_REG] = 0x18, |
| [C_CAN_IF1_ARB2_REG] = 0x1A, |
| [C_CAN_IF1_MSGCTRL_REG] = 0x1C, |
| [C_CAN_IF1_DATA1_REG] = 0x1E, |
| [C_CAN_IF1_DATA2_REG] = 0x20, |
| [C_CAN_IF1_DATA3_REG] = 0x22, |
| [C_CAN_IF1_DATA4_REG] = 0x24, |
| [C_CAN_IF2_COMREQ_REG] = 0x40, |
| [C_CAN_IF2_COMMSK_REG] = 0x42, |
| [C_CAN_IF2_MASK1_REG] = 0x44, |
| [C_CAN_IF2_MASK2_REG] = 0x46, |
| [C_CAN_IF2_ARB1_REG] = 0x48, |
| [C_CAN_IF2_ARB2_REG] = 0x4A, |
| [C_CAN_IF2_MSGCTRL_REG] = 0x4C, |
| [C_CAN_IF2_DATA1_REG] = 0x4E, |
| [C_CAN_IF2_DATA2_REG] = 0x50, |
| [C_CAN_IF2_DATA3_REG] = 0x52, |
| [C_CAN_IF2_DATA4_REG] = 0x54, |
| [C_CAN_TXRQST1_REG] = 0x80, |
| [C_CAN_TXRQST2_REG] = 0x82, |
| [C_CAN_NEWDAT1_REG] = 0x90, |
| [C_CAN_NEWDAT2_REG] = 0x92, |
| [C_CAN_INTPND1_REG] = 0xA0, |
| [C_CAN_INTPND2_REG] = 0xA2, |
| [C_CAN_MSGVAL1_REG] = 0xB0, |
| [C_CAN_MSGVAL2_REG] = 0xB2, |
| }; |
| |
| static const u16 __maybe_unused reg_map_d_can[] = { |
| [C_CAN_CTRL_REG] = 0x00, |
| [C_CAN_CTRL_EX_REG] = 0x02, |
| [C_CAN_STS_REG] = 0x04, |
| [C_CAN_ERR_CNT_REG] = 0x08, |
| [C_CAN_BTR_REG] = 0x0C, |
| [C_CAN_BRPEXT_REG] = 0x0E, |
| [C_CAN_INT_REG] = 0x10, |
| [C_CAN_TEST_REG] = 0x14, |
| [C_CAN_FUNCTION_REG] = 0x18, |
| [C_CAN_TXRQST1_REG] = 0x88, |
| [C_CAN_TXRQST2_REG] = 0x8A, |
| [C_CAN_NEWDAT1_REG] = 0x9C, |
| [C_CAN_NEWDAT2_REG] = 0x9E, |
| [C_CAN_INTPND1_REG] = 0xB0, |
| [C_CAN_INTPND2_REG] = 0xB2, |
| [C_CAN_INTPND3_REG] = 0xB4, |
| [C_CAN_MSGVAL1_REG] = 0xC4, |
| [C_CAN_MSGVAL2_REG] = 0xC6, |
| [C_CAN_IF1_COMREQ_REG] = 0x100, |
| [C_CAN_IF1_COMMSK_REG] = 0x102, |
| [C_CAN_IF1_MASK1_REG] = 0x104, |
| [C_CAN_IF1_MASK2_REG] = 0x106, |
| [C_CAN_IF1_ARB1_REG] = 0x108, |
| [C_CAN_IF1_ARB2_REG] = 0x10A, |
| [C_CAN_IF1_MSGCTRL_REG] = 0x10C, |
| [C_CAN_IF1_DATA1_REG] = 0x110, |
| [C_CAN_IF1_DATA2_REG] = 0x112, |
| [C_CAN_IF1_DATA3_REG] = 0x114, |
| [C_CAN_IF1_DATA4_REG] = 0x116, |
| [C_CAN_IF2_COMREQ_REG] = 0x120, |
| [C_CAN_IF2_COMMSK_REG] = 0x122, |
| [C_CAN_IF2_MASK1_REG] = 0x124, |
| [C_CAN_IF2_MASK2_REG] = 0x126, |
| [C_CAN_IF2_ARB1_REG] = 0x128, |
| [C_CAN_IF2_ARB2_REG] = 0x12A, |
| [C_CAN_IF2_MSGCTRL_REG] = 0x12C, |
| [C_CAN_IF2_DATA1_REG] = 0x130, |
| [C_CAN_IF2_DATA2_REG] = 0x132, |
| [C_CAN_IF2_DATA3_REG] = 0x134, |
| [C_CAN_IF2_DATA4_REG] = 0x136, |
| }; |
| |
| enum c_can_dev_id { |
| BOSCH_C_CAN, |
| BOSCH_D_CAN, |
| }; |
| |
| struct raminit_bits { |
| u8 start; |
| u8 done; |
| }; |
| |
| struct c_can_driver_data { |
| enum c_can_dev_id id; |
| unsigned int msg_obj_num; |
| |
| /* RAMINIT register description. Optional. */ |
| const struct raminit_bits *raminit_bits; /* Array of START/DONE bit positions */ |
| u8 raminit_num; /* Number of CAN instances on the SoC */ |
| bool raminit_pulse; /* If set, sets and clears START bit (pulse) */ |
| }; |
| |
| /* Out of band RAMINIT register access via syscon regmap */ |
| struct c_can_raminit { |
| struct regmap *syscon; /* for raminit ctrl. reg. access */ |
| unsigned int reg; /* register index within syscon */ |
| struct raminit_bits bits; |
| bool needs_pulse; |
| }; |
| |
| /* c_can tx ring structure */ |
| struct c_can_tx_ring { |
| unsigned int head; |
| unsigned int tail; |
| unsigned int obj_num; |
| }; |
| |
| /* c_can private data structure */ |
| struct c_can_priv { |
| struct can_priv can; /* must be the first member */ |
| struct napi_struct napi; |
| struct net_device *dev; |
| struct device *device; |
| unsigned int msg_obj_num; |
| unsigned int msg_obj_rx_num; |
| unsigned int msg_obj_tx_num; |
| unsigned int msg_obj_rx_first; |
| unsigned int msg_obj_rx_last; |
| unsigned int msg_obj_tx_first; |
| unsigned int msg_obj_tx_last; |
| u32 msg_obj_rx_mask; |
| atomic_t sie_pending; |
| unsigned long tx_dir; |
| int last_status; |
| struct c_can_tx_ring tx; |
| u16 (*read_reg)(const struct c_can_priv *priv, enum reg index); |
| void (*write_reg)(const struct c_can_priv *priv, enum reg index, u16 val); |
| u32 (*read_reg32)(const struct c_can_priv *priv, enum reg index); |
| void (*write_reg32)(const struct c_can_priv *priv, enum reg index, u32 val); |
| void __iomem *base; |
| const u16 *regs; |
| enum c_can_dev_id type; |
| struct c_can_raminit raminit_sys; /* RAMINIT via syscon regmap */ |
| void (*raminit)(const struct c_can_priv *priv, bool enable); |
| u32 comm_rcv_high; |
| }; |
| |
| struct net_device *alloc_c_can_dev(int msg_obj_num); |
| void free_c_can_dev(struct net_device *dev); |
| int register_c_can_dev(struct net_device *dev); |
| void unregister_c_can_dev(struct net_device *dev); |
| |
| #ifdef CONFIG_PM |
| int c_can_power_up(struct net_device *dev); |
| int c_can_power_down(struct net_device *dev); |
| #endif |
| |
| extern const struct ethtool_ops c_can_ethtool_ops; |
| |
| static inline u8 c_can_get_tx_head(const struct c_can_tx_ring *ring) |
| { |
| return ring->head & (ring->obj_num - 1); |
| } |
| |
| static inline u8 c_can_get_tx_tail(const struct c_can_tx_ring *ring) |
| { |
| return ring->tail & (ring->obj_num - 1); |
| } |
| |
| static inline u8 c_can_get_tx_free(const struct c_can_priv *priv, |
| const struct c_can_tx_ring *ring) |
| { |
| u8 head = c_can_get_tx_head(ring); |
| u8 tail = c_can_get_tx_tail(ring); |
| |
| if (priv->type == BOSCH_D_CAN) |
| return ring->obj_num - (ring->head - ring->tail); |
| |
| /* This is not a FIFO. C/D_CAN sends out the buffers |
| * prioritized. The lowest buffer number wins. |
| */ |
| if (head < tail) |
| return 0; |
| |
| return ring->obj_num - head; |
| } |
| |
| #endif /* C_CAN_H */ |
