1 /* 2 * CAN bus driver for Bosch C_CAN controller 3 * 4 * Copyright (C) 2010 ST Microelectronics 5 * Bhupesh Sharma <bhupesh.sharma@st.com> 6 * 7 * Borrowed heavily from the C_CAN driver originally written by: 8 * Copyright (C) 2007 9 * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de> 10 * - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch> 11 * 12 * Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B. 13 * Bosch C_CAN user manual can be obtained from: 14 * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/ 15 * users_manual_c_can.pdf 16 * 17 * This file is licensed under the terms of the GNU General Public 18 * License version 2. This program is licensed "as is" without any 19 * warranty of any kind, whether express or implied. 20 */ 21 22 #ifndef C_CAN_H 23 #define C_CAN_H 24 25 /* message object split */ 26 #define C_CAN_NO_OF_OBJECTS 32 27 #define C_CAN_MSG_OBJ_RX_NUM 16 28 #define C_CAN_MSG_OBJ_TX_NUM 16 29 30 #define C_CAN_MSG_OBJ_RX_FIRST 1 31 #define C_CAN_MSG_OBJ_RX_LAST (C_CAN_MSG_OBJ_RX_FIRST + \ 32 C_CAN_MSG_OBJ_RX_NUM - 1) 33 34 #define C_CAN_MSG_OBJ_TX_FIRST (C_CAN_MSG_OBJ_RX_LAST + 1) 35 #define C_CAN_MSG_OBJ_TX_LAST (C_CAN_MSG_OBJ_TX_FIRST + \ 36 C_CAN_MSG_OBJ_TX_NUM - 1) 37 38 #define C_CAN_MSG_OBJ_RX_SPLIT 9 39 #define C_CAN_MSG_RX_LOW_LAST (C_CAN_MSG_OBJ_RX_SPLIT - 1) 40 #define RECEIVE_OBJECT_BITS 0x0000ffff 41 42 enum reg { 43 C_CAN_CTRL_REG = 0, 44 C_CAN_CTRL_EX_REG, 45 C_CAN_STS_REG, 46 C_CAN_ERR_CNT_REG, 47 C_CAN_BTR_REG, 48 C_CAN_INT_REG, 49 C_CAN_TEST_REG, 50 C_CAN_BRPEXT_REG, 51 C_CAN_IF1_COMREQ_REG, 52 C_CAN_IF1_COMMSK_REG, 53 C_CAN_IF1_MASK1_REG, 54 C_CAN_IF1_MASK2_REG, 55 C_CAN_IF1_ARB1_REG, 56 C_CAN_IF1_ARB2_REG, 57 C_CAN_IF1_MSGCTRL_REG, 58 C_CAN_IF1_DATA1_REG, 59 C_CAN_IF1_DATA2_REG, 60 C_CAN_IF1_DATA3_REG, 61 C_CAN_IF1_DATA4_REG, 62 C_CAN_IF2_COMREQ_REG, 63 C_CAN_IF2_COMMSK_REG, 64 C_CAN_IF2_MASK1_REG, 65 C_CAN_IF2_MASK2_REG, 66 C_CAN_IF2_ARB1_REG, 67 C_CAN_IF2_ARB2_REG, 68 C_CAN_IF2_MSGCTRL_REG, 69 C_CAN_IF2_DATA1_REG, 70 C_CAN_IF2_DATA2_REG, 71 C_CAN_IF2_DATA3_REG, 72 C_CAN_IF2_DATA4_REG, 73 C_CAN_TXRQST1_REG, 74 C_CAN_TXRQST2_REG, 75 C_CAN_NEWDAT1_REG, 76 C_CAN_NEWDAT2_REG, 77 C_CAN_INTPND1_REG, 78 C_CAN_INTPND2_REG, 79 C_CAN_MSGVAL1_REG, 80 C_CAN_MSGVAL2_REG, 81 C_CAN_FUNCTION_REG, 82 }; 83 84 static const u16 __maybe_unused reg_map_c_can[] = { 85 [C_CAN_CTRL_REG] = 0x00, 86 [C_CAN_STS_REG] = 0x02, 87 [C_CAN_ERR_CNT_REG] = 0x04, 88 [C_CAN_BTR_REG] = 0x06, 89 [C_CAN_INT_REG] = 0x08, 90 [C_CAN_TEST_REG] = 0x0A, 91 [C_CAN_BRPEXT_REG] = 0x0C, 92 [C_CAN_IF1_COMREQ_REG] = 0x10, 93 [C_CAN_IF1_COMMSK_REG] = 0x12, 94 [C_CAN_IF1_MASK1_REG] = 0x14, 95 [C_CAN_IF1_MASK2_REG] = 0x16, 96 [C_CAN_IF1_ARB1_REG] = 0x18, 97 [C_CAN_IF1_ARB2_REG] = 0x1A, 98 [C_CAN_IF1_MSGCTRL_REG] = 0x1C, 99 [C_CAN_IF1_DATA1_REG] = 0x1E, 100 [C_CAN_IF1_DATA2_REG] = 0x20, 101 [C_CAN_IF1_DATA3_REG] = 0x22, 102 [C_CAN_IF1_DATA4_REG] = 0x24, 103 [C_CAN_IF2_COMREQ_REG] = 0x40, 104 [C_CAN_IF2_COMMSK_REG] = 0x42, 105 [C_CAN_IF2_MASK1_REG] = 0x44, 106 [C_CAN_IF2_MASK2_REG] = 0x46, 107 [C_CAN_IF2_ARB1_REG] = 0x48, 108 [C_CAN_IF2_ARB2_REG] = 0x4A, 109 [C_CAN_IF2_MSGCTRL_REG] = 0x4C, 110 [C_CAN_IF2_DATA1_REG] = 0x4E, 111 [C_CAN_IF2_DATA2_REG] = 0x50, 112 [C_CAN_IF2_DATA3_REG] = 0x52, 113 [C_CAN_IF2_DATA4_REG] = 0x54, 114 [C_CAN_TXRQST1_REG] = 0x80, 115 [C_CAN_TXRQST2_REG] = 0x82, 116 [C_CAN_NEWDAT1_REG] = 0x90, 117 [C_CAN_NEWDAT2_REG] = 0x92, 118 [C_CAN_INTPND1_REG] = 0xA0, 119 [C_CAN_INTPND2_REG] = 0xA2, 120 [C_CAN_MSGVAL1_REG] = 0xB0, 121 [C_CAN_MSGVAL2_REG] = 0xB2, 122 }; 123 124 static const u16 __maybe_unused reg_map_d_can[] = { 125 [C_CAN_CTRL_REG] = 0x00, 126 [C_CAN_CTRL_EX_REG] = 0x02, 127 [C_CAN_STS_REG] = 0x04, 128 [C_CAN_ERR_CNT_REG] = 0x08, 129 [C_CAN_BTR_REG] = 0x0C, 130 [C_CAN_BRPEXT_REG] = 0x0E, 131 [C_CAN_INT_REG] = 0x10, 132 [C_CAN_TEST_REG] = 0x14, 133 [C_CAN_FUNCTION_REG] = 0x18, 134 [C_CAN_TXRQST1_REG] = 0x88, 135 [C_CAN_TXRQST2_REG] = 0x8A, 136 [C_CAN_NEWDAT1_REG] = 0x9C, 137 [C_CAN_NEWDAT2_REG] = 0x9E, 138 [C_CAN_INTPND1_REG] = 0xB0, 139 [C_CAN_INTPND2_REG] = 0xB2, 140 [C_CAN_MSGVAL1_REG] = 0xC4, 141 [C_CAN_MSGVAL2_REG] = 0xC6, 142 [C_CAN_IF1_COMREQ_REG] = 0x100, 143 [C_CAN_IF1_COMMSK_REG] = 0x102, 144 [C_CAN_IF1_MASK1_REG] = 0x104, 145 [C_CAN_IF1_MASK2_REG] = 0x106, 146 [C_CAN_IF1_ARB1_REG] = 0x108, 147 [C_CAN_IF1_ARB2_REG] = 0x10A, 148 [C_CAN_IF1_MSGCTRL_REG] = 0x10C, 149 [C_CAN_IF1_DATA1_REG] = 0x110, 150 [C_CAN_IF1_DATA2_REG] = 0x112, 151 [C_CAN_IF1_DATA3_REG] = 0x114, 152 [C_CAN_IF1_DATA4_REG] = 0x116, 153 [C_CAN_IF2_COMREQ_REG] = 0x120, 154 [C_CAN_IF2_COMMSK_REG] = 0x122, 155 [C_CAN_IF2_MASK1_REG] = 0x124, 156 [C_CAN_IF2_MASK2_REG] = 0x126, 157 [C_CAN_IF2_ARB1_REG] = 0x128, 158 [C_CAN_IF2_ARB2_REG] = 0x12A, 159 [C_CAN_IF2_MSGCTRL_REG] = 0x12C, 160 [C_CAN_IF2_DATA1_REG] = 0x130, 161 [C_CAN_IF2_DATA2_REG] = 0x132, 162 [C_CAN_IF2_DATA3_REG] = 0x134, 163 [C_CAN_IF2_DATA4_REG] = 0x136, 164 }; 165 166 enum c_can_dev_id { 167 BOSCH_C_CAN_PLATFORM, 168 BOSCH_C_CAN, 169 BOSCH_D_CAN, 170 }; 171 172 struct raminit_bits { 173 u8 start; 174 u8 done; 175 }; 176 177 struct c_can_driver_data { 178 enum c_can_dev_id id; 179 180 /* RAMINIT register description. Optional. */ 181 const struct raminit_bits *raminit_bits; /* Array of START/DONE bit positions */ 182 u8 raminit_num; /* Number of CAN instances on the SoC */ 183 bool raminit_pulse; /* If set, sets and clears START bit (pulse) */ 184 }; 185 186 /* Out of band RAMINIT register access via syscon regmap */ 187 struct c_can_raminit { 188 struct regmap *syscon; /* for raminit ctrl. reg. access */ 189 unsigned int reg; /* register index within syscon */ 190 struct raminit_bits bits; 191 bool needs_pulse; 192 }; 193 194 /* c_can private data structure */ 195 struct c_can_priv { 196 struct can_priv can; /* must be the first member */ 197 struct napi_struct napi; 198 struct net_device *dev; 199 struct device *device; 200 atomic_t tx_active; 201 atomic_t sie_pending; 202 unsigned long tx_dir; 203 int last_status; 204 u16 (*read_reg) (const struct c_can_priv *priv, enum reg index); 205 void (*write_reg) (const struct c_can_priv *priv, enum reg index, u16 val); 206 u32 (*read_reg32) (const struct c_can_priv *priv, enum reg index); 207 void (*write_reg32) (const struct c_can_priv *priv, enum reg index, u32 val); 208 void __iomem *base; 209 const u16 *regs; 210 void *priv; /* for board-specific data */ 211 enum c_can_dev_id type; 212 struct c_can_raminit raminit_sys; /* RAMINIT via syscon regmap */ 213 void (*raminit) (const struct c_can_priv *priv, bool enable); 214 u32 comm_rcv_high; 215 u32 rxmasked; 216 u32 dlc[C_CAN_MSG_OBJ_TX_NUM]; 217 }; 218 219 struct net_device *alloc_c_can_dev(void); 220 void free_c_can_dev(struct net_device *dev); 221 int register_c_can_dev(struct net_device *dev); 222 void unregister_c_can_dev(struct net_device *dev); 223 224 #ifdef CONFIG_PM 225 int c_can_power_up(struct net_device *dev); 226 int c_can_power_down(struct net_device *dev); 227 #endif 228 229 #endif /* C_CAN_H */ 230