230 lines
6.3 KiB
C
230 lines
6.3 KiB
C
|
/*
|
||
|
|
* 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
|
||
|
|
|
||
|
|
/* message object split */
|
||
|
|
#define C_CAN_NO_OF_OBJECTS 32
|
||
|
|
#define C_CAN_MSG_OBJ_RX_NUM 16
|
||
|
|
#define C_CAN_MSG_OBJ_TX_NUM 16
|
||
|
|
|
||
|
|
#define C_CAN_MSG_OBJ_RX_FIRST 1
|
||
|
|
#define C_CAN_MSG_OBJ_RX_LAST (C_CAN_MSG_OBJ_RX_FIRST + \
|
||
|
|
C_CAN_MSG_OBJ_RX_NUM - 1)
|
||
|
|
|
||
|
|
#define C_CAN_MSG_OBJ_TX_FIRST (C_CAN_MSG_OBJ_RX_LAST + 1)
|
||
|
|
#define C_CAN_MSG_OBJ_TX_LAST (C_CAN_MSG_OBJ_TX_FIRST + \
|
||
|
|
C_CAN_MSG_OBJ_TX_NUM - 1)
|
||
|
|
|
||
|
|
#define C_CAN_MSG_OBJ_RX_SPLIT 9
|
||
|
|
#define C_CAN_MSG_RX_LOW_LAST (C_CAN_MSG_OBJ_RX_SPLIT - 1)
|
||
|
|
#define RECEIVE_OBJECT_BITS 0x0000ffff
|
||
|
|
|
||
|
|
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_MSGVAL1_REG,
|
||
|
|
C_CAN_MSGVAL2_REG,
|
||
|
|
C_CAN_FUNCTION_REG,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const u16 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 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_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_PLATFORM,
|
||
|
|
BOSCH_C_CAN,
|
||
|
|
BOSCH_D_CAN,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct raminit_bits {
|
||
|
|
u8 start;
|
||
|
|
u8 done;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct c_can_driver_data {
|
||
|
|
enum c_can_dev_id id;
|
||
|
|
|
||
|
|
/* 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 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;
|
||
|
|
atomic_t tx_active;
|
||
|
|
atomic_t sie_pending;
|
||
|
|
unsigned long tx_dir;
|
||
|
|
int last_status;
|
||
|
|
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;
|
||
|
|
void *priv; /* for board-specific data */
|
||
|
|
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;
|
||
|
|
u32 rxmasked;
|
||
|
|
u32 dlc[C_CAN_MSG_OBJ_TX_NUM];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct net_device *alloc_c_can_dev(void);
|
||
|
|
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
|
||
|
|
|
||
|
|
#endif /* C_CAN_H */
|