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