c_can.h revision d61d09de023320b95a536eb4d31941e67002a93c
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/* 26 * IFx register masks: 27 * allow easy operation on 16-bit registers when the 28 * argument is 32-bit instead 29 */ 30#define IFX_WRITE_LOW_16BIT(x) ((x) & 0xFFFF) 31#define IFX_WRITE_HIGH_16BIT(x) (((x) & 0xFFFF0000) >> 16) 32 33/* message object split */ 34#define C_CAN_NO_OF_OBJECTS 32 35#define C_CAN_MSG_OBJ_RX_NUM 16 36#define C_CAN_MSG_OBJ_TX_NUM 16 37 38#define C_CAN_MSG_OBJ_RX_FIRST 1 39#define C_CAN_MSG_OBJ_RX_LAST (C_CAN_MSG_OBJ_RX_FIRST + \ 40 C_CAN_MSG_OBJ_RX_NUM - 1) 41 42#define C_CAN_MSG_OBJ_TX_FIRST (C_CAN_MSG_OBJ_RX_LAST + 1) 43#define C_CAN_MSG_OBJ_TX_LAST (C_CAN_MSG_OBJ_TX_FIRST + \ 44 C_CAN_MSG_OBJ_TX_NUM - 1) 45 46#define C_CAN_MSG_OBJ_RX_SPLIT 9 47#define C_CAN_MSG_RX_LOW_LAST (C_CAN_MSG_OBJ_RX_SPLIT - 1) 48 49#define C_CAN_NEXT_MSG_OBJ_MASK (C_CAN_MSG_OBJ_TX_NUM - 1) 50#define RECEIVE_OBJECT_BITS 0x0000ffff 51 52enum reg { 53 C_CAN_CTRL_REG = 0, 54 C_CAN_CTRL_EX_REG, 55 C_CAN_STS_REG, 56 C_CAN_ERR_CNT_REG, 57 C_CAN_BTR_REG, 58 C_CAN_INT_REG, 59 C_CAN_TEST_REG, 60 C_CAN_BRPEXT_REG, 61 C_CAN_IF1_COMREQ_REG, 62 C_CAN_IF1_COMMSK_REG, 63 C_CAN_IF1_MASK1_REG, 64 C_CAN_IF1_MASK2_REG, 65 C_CAN_IF1_ARB1_REG, 66 C_CAN_IF1_ARB2_REG, 67 C_CAN_IF1_MSGCTRL_REG, 68 C_CAN_IF1_DATA1_REG, 69 C_CAN_IF1_DATA2_REG, 70 C_CAN_IF1_DATA3_REG, 71 C_CAN_IF1_DATA4_REG, 72 C_CAN_IF2_COMREQ_REG, 73 C_CAN_IF2_COMMSK_REG, 74 C_CAN_IF2_MASK1_REG, 75 C_CAN_IF2_MASK2_REG, 76 C_CAN_IF2_ARB1_REG, 77 C_CAN_IF2_ARB2_REG, 78 C_CAN_IF2_MSGCTRL_REG, 79 C_CAN_IF2_DATA1_REG, 80 C_CAN_IF2_DATA2_REG, 81 C_CAN_IF2_DATA3_REG, 82 C_CAN_IF2_DATA4_REG, 83 C_CAN_TXRQST1_REG, 84 C_CAN_TXRQST2_REG, 85 C_CAN_NEWDAT1_REG, 86 C_CAN_NEWDAT2_REG, 87 C_CAN_INTPND1_REG, 88 C_CAN_INTPND2_REG, 89 C_CAN_MSGVAL1_REG, 90 C_CAN_MSGVAL2_REG, 91}; 92 93static const u16 reg_map_c_can[] = { 94 [C_CAN_CTRL_REG] = 0x00, 95 [C_CAN_STS_REG] = 0x02, 96 [C_CAN_ERR_CNT_REG] = 0x04, 97 [C_CAN_BTR_REG] = 0x06, 98 [C_CAN_INT_REG] = 0x08, 99 [C_CAN_TEST_REG] = 0x0A, 100 [C_CAN_BRPEXT_REG] = 0x0C, 101 [C_CAN_IF1_COMREQ_REG] = 0x10, 102 [C_CAN_IF1_COMMSK_REG] = 0x12, 103 [C_CAN_IF1_MASK1_REG] = 0x14, 104 [C_CAN_IF1_MASK2_REG] = 0x16, 105 [C_CAN_IF1_ARB1_REG] = 0x18, 106 [C_CAN_IF1_ARB2_REG] = 0x1A, 107 [C_CAN_IF1_MSGCTRL_REG] = 0x1C, 108 [C_CAN_IF1_DATA1_REG] = 0x1E, 109 [C_CAN_IF1_DATA2_REG] = 0x20, 110 [C_CAN_IF1_DATA3_REG] = 0x22, 111 [C_CAN_IF1_DATA4_REG] = 0x24, 112 [C_CAN_IF2_COMREQ_REG] = 0x40, 113 [C_CAN_IF2_COMMSK_REG] = 0x42, 114 [C_CAN_IF2_MASK1_REG] = 0x44, 115 [C_CAN_IF2_MASK2_REG] = 0x46, 116 [C_CAN_IF2_ARB1_REG] = 0x48, 117 [C_CAN_IF2_ARB2_REG] = 0x4A, 118 [C_CAN_IF2_MSGCTRL_REG] = 0x4C, 119 [C_CAN_IF2_DATA1_REG] = 0x4E, 120 [C_CAN_IF2_DATA2_REG] = 0x50, 121 [C_CAN_IF2_DATA3_REG] = 0x52, 122 [C_CAN_IF2_DATA4_REG] = 0x54, 123 [C_CAN_TXRQST1_REG] = 0x80, 124 [C_CAN_TXRQST2_REG] = 0x82, 125 [C_CAN_NEWDAT1_REG] = 0x90, 126 [C_CAN_NEWDAT2_REG] = 0x92, 127 [C_CAN_INTPND1_REG] = 0xA0, 128 [C_CAN_INTPND2_REG] = 0xA2, 129 [C_CAN_MSGVAL1_REG] = 0xB0, 130 [C_CAN_MSGVAL2_REG] = 0xB2, 131}; 132 133static const u16 reg_map_d_can[] = { 134 [C_CAN_CTRL_REG] = 0x00, 135 [C_CAN_CTRL_EX_REG] = 0x02, 136 [C_CAN_STS_REG] = 0x04, 137 [C_CAN_ERR_CNT_REG] = 0x08, 138 [C_CAN_BTR_REG] = 0x0C, 139 [C_CAN_BRPEXT_REG] = 0x0E, 140 [C_CAN_INT_REG] = 0x10, 141 [C_CAN_TEST_REG] = 0x14, 142 [C_CAN_TXRQST1_REG] = 0x88, 143 [C_CAN_TXRQST2_REG] = 0x8A, 144 [C_CAN_NEWDAT1_REG] = 0x9C, 145 [C_CAN_NEWDAT2_REG] = 0x9E, 146 [C_CAN_INTPND1_REG] = 0xB0, 147 [C_CAN_INTPND2_REG] = 0xB2, 148 [C_CAN_MSGVAL1_REG] = 0xC4, 149 [C_CAN_MSGVAL2_REG] = 0xC6, 150 [C_CAN_IF1_COMREQ_REG] = 0x100, 151 [C_CAN_IF1_COMMSK_REG] = 0x102, 152 [C_CAN_IF1_MASK1_REG] = 0x104, 153 [C_CAN_IF1_MASK2_REG] = 0x106, 154 [C_CAN_IF1_ARB1_REG] = 0x108, 155 [C_CAN_IF1_ARB2_REG] = 0x10A, 156 [C_CAN_IF1_MSGCTRL_REG] = 0x10C, 157 [C_CAN_IF1_DATA1_REG] = 0x110, 158 [C_CAN_IF1_DATA2_REG] = 0x112, 159 [C_CAN_IF1_DATA3_REG] = 0x114, 160 [C_CAN_IF1_DATA4_REG] = 0x116, 161 [C_CAN_IF2_COMREQ_REG] = 0x120, 162 [C_CAN_IF2_COMMSK_REG] = 0x122, 163 [C_CAN_IF2_MASK1_REG] = 0x124, 164 [C_CAN_IF2_MASK2_REG] = 0x126, 165 [C_CAN_IF2_ARB1_REG] = 0x128, 166 [C_CAN_IF2_ARB2_REG] = 0x12A, 167 [C_CAN_IF2_MSGCTRL_REG] = 0x12C, 168 [C_CAN_IF2_DATA1_REG] = 0x130, 169 [C_CAN_IF2_DATA2_REG] = 0x132, 170 [C_CAN_IF2_DATA3_REG] = 0x134, 171 [C_CAN_IF2_DATA4_REG] = 0x136, 172}; 173 174enum c_can_dev_id { 175 BOSCH_C_CAN_PLATFORM, 176 BOSCH_C_CAN, 177 BOSCH_D_CAN, 178}; 179 180/* c_can private data structure */ 181struct c_can_priv { 182 struct can_priv can; /* must be the first member */ 183 struct napi_struct napi; 184 struct net_device *dev; 185 struct device *device; 186 spinlock_t xmit_lock; 187 int tx_object; 188 int last_status; 189 u16 (*read_reg) (struct c_can_priv *priv, enum reg index); 190 void (*write_reg) (struct c_can_priv *priv, enum reg index, u16 val); 191 void __iomem *base; 192 const u16 *regs; 193 unsigned long irq_flags; /* for request_irq() */ 194 unsigned int tx_next; 195 unsigned int tx_echo; 196 void *priv; /* for board-specific data */ 197 enum c_can_dev_id type; 198 u32 __iomem *raminit_ctrlreg; 199 unsigned int instance; 200 void (*raminit) (const struct c_can_priv *priv, bool enable); 201 u32 comm_rcv_high; 202 u32 rxmasked; 203 u32 dlc[C_CAN_MSG_OBJ_TX_NUM]; 204}; 205 206struct net_device *alloc_c_can_dev(void); 207void free_c_can_dev(struct net_device *dev); 208int register_c_can_dev(struct net_device *dev); 209void unregister_c_can_dev(struct net_device *dev); 210 211#ifdef CONFIG_PM 212int c_can_power_up(struct net_device *dev); 213int c_can_power_down(struct net_device *dev); 214#endif 215 216#endif /* C_CAN_H */ 217