1// SPDX-License-Identifier: GPL-2.0
2//
3// tcan4x5x - Texas Instruments TCAN4x5x Family CAN controller driver
4//
5// Copyright (c) 2020 Pengutronix,
6// Marc Kleine-Budde <kernel@pengutronix.de>
7// Copyright (c) 2018-2019 Texas Instruments Incorporated
8// http://www.ti.com/
9
10#include "tcan4x5x.h"
11
12#define TCAN4X5X_SPI_INSTRUCTION_WRITE (0x61 << 24)
13#define TCAN4X5X_SPI_INSTRUCTION_READ (0x41 << 24)
14
15#define TCAN4X5X_MAX_REGISTER 0x87fc
16
17static int tcan4x5x_regmap_gather_write(void *context,
18 const void *reg, size_t reg_len,
19 const void *val, size_t val_len)
20{
21 struct spi_device *spi = context;
22 struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
23 struct tcan4x5x_map_buf *buf_tx = &priv->map_buf_tx;
24 struct spi_transfer xfer[] = {
25 {
26 .tx_buf = buf_tx,
27 .len = sizeof(buf_tx->cmd) + val_len,
28 },
29 };
30
31 memcpy(&buf_tx->cmd, reg, sizeof(buf_tx->cmd.cmd) +
32 sizeof(buf_tx->cmd.addr));
33 tcan4x5x_spi_cmd_set_len(cmd: &buf_tx->cmd, len: val_len);
34 memcpy(buf_tx->data, val, val_len);
35
36 return spi_sync_transfer(spi, xfers: xfer, ARRAY_SIZE(xfer));
37}
38
39static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
40{
41 return tcan4x5x_regmap_gather_write(context, reg: data, reg_len: sizeof(__be32),
42 val: data + sizeof(__be32),
43 val_len: count - sizeof(__be32));
44}
45
46static int tcan4x5x_regmap_read(void *context,
47 const void *reg_buf, size_t reg_len,
48 void *val_buf, size_t val_len)
49{
50 struct spi_device *spi = context;
51 struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
52 struct tcan4x5x_map_buf *buf_rx = &priv->map_buf_rx;
53 struct tcan4x5x_map_buf *buf_tx = &priv->map_buf_tx;
54 struct spi_transfer xfer[2] = {
55 {
56 .tx_buf = buf_tx,
57 }
58 };
59 struct spi_message msg;
60 int err;
61
62 spi_message_init(m: &msg);
63 spi_message_add_tail(t: &xfer[0], m: &msg);
64
65 memcpy(&buf_tx->cmd, reg_buf, sizeof(buf_tx->cmd.cmd) +
66 sizeof(buf_tx->cmd.addr));
67 tcan4x5x_spi_cmd_set_len(cmd: &buf_tx->cmd, len: val_len);
68
69 if (spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX) {
70 xfer[0].len = sizeof(buf_tx->cmd);
71
72 xfer[1].rx_buf = val_buf;
73 xfer[1].len = val_len;
74 spi_message_add_tail(t: &xfer[1], m: &msg);
75 } else {
76 xfer[0].rx_buf = buf_rx;
77 xfer[0].len = sizeof(buf_tx->cmd) + val_len;
78
79 if (TCAN4X5X_SANITIZE_SPI)
80 memset(buf_tx->data, 0x0, val_len);
81 }
82
83 err = spi_sync(spi, message: &msg);
84 if (err)
85 return err;
86
87 if (!(spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX))
88 memcpy(val_buf, buf_rx->data, val_len);
89
90 return 0;
91}
92
93static const struct regmap_range tcan4x5x_reg_table_wr_range[] = {
94 /* Device ID and SPI Registers */
95 regmap_reg_range(0x000c, 0x0010),
96 /* Device configuration registers and Interrupt Flags*/
97 regmap_reg_range(0x0800, 0x080c),
98 regmap_reg_range(0x0820, 0x0820),
99 regmap_reg_range(0x0830, 0x0830),
100 /* M_CAN */
101 regmap_reg_range(0x100c, 0x102c),
102 regmap_reg_range(0x1048, 0x1048),
103 regmap_reg_range(0x1050, 0x105c),
104 regmap_reg_range(0x1080, 0x1088),
105 regmap_reg_range(0x1090, 0x1090),
106 regmap_reg_range(0x1098, 0x10a0),
107 regmap_reg_range(0x10a8, 0x10b0),
108 regmap_reg_range(0x10b8, 0x10c0),
109 regmap_reg_range(0x10c8, 0x10c8),
110 regmap_reg_range(0x10d0, 0x10d4),
111 regmap_reg_range(0x10e0, 0x10e4),
112 regmap_reg_range(0x10f0, 0x10f0),
113 regmap_reg_range(0x10f8, 0x10f8),
114 /* MRAM */
115 regmap_reg_range(0x8000, 0x87fc),
116};
117
118static const struct regmap_range tcan4x5x_reg_table_rd_range[] = {
119 regmap_reg_range(0x0000, 0x0010), /* Device ID and SPI Registers */
120 regmap_reg_range(0x0800, 0x0830), /* Device configuration registers and Interrupt Flags*/
121 regmap_reg_range(0x1000, 0x10fc), /* M_CAN */
122 regmap_reg_range(0x8000, 0x87fc), /* MRAM */
123};
124
125static const struct regmap_access_table tcan4x5x_reg_table_wr = {
126 .yes_ranges = tcan4x5x_reg_table_wr_range,
127 .n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_wr_range),
128};
129
130static const struct regmap_access_table tcan4x5x_reg_table_rd = {
131 .yes_ranges = tcan4x5x_reg_table_rd_range,
132 .n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_rd_range),
133};
134
135static const struct regmap_config tcan4x5x_regmap = {
136 .reg_bits = 24,
137 .reg_stride = 4,
138 .pad_bits = 8,
139 .val_bits = 32,
140 .wr_table = &tcan4x5x_reg_table_wr,
141 .rd_table = &tcan4x5x_reg_table_rd,
142 .max_register = TCAN4X5X_MAX_REGISTER,
143 .cache_type = REGCACHE_NONE,
144 .read_flag_mask = (__force unsigned long)
145 cpu_to_be32(TCAN4X5X_SPI_INSTRUCTION_READ),
146 .write_flag_mask = (__force unsigned long)
147 cpu_to_be32(TCAN4X5X_SPI_INSTRUCTION_WRITE),
148};
149
150static const struct regmap_bus tcan4x5x_bus = {
151 .write = tcan4x5x_regmap_write,
152 .gather_write = tcan4x5x_regmap_gather_write,
153 .read = tcan4x5x_regmap_read,
154 .reg_format_endian_default = REGMAP_ENDIAN_BIG,
155 .val_format_endian_default = REGMAP_ENDIAN_BIG,
156 .max_raw_read = 256,
157 .max_raw_write = 256,
158};
159
160int tcan4x5x_regmap_init(struct tcan4x5x_priv *priv)
161{
162 priv->regmap = devm_regmap_init(&priv->spi->dev, &tcan4x5x_bus,
163 priv->spi, &tcan4x5x_regmap);
164 return PTR_ERR_OR_ZERO(ptr: priv->regmap);
165}
166

source code of linux/drivers/net/can/m_can/tcan4x5x-regmap.c