drivers/net/can/m_can/tcan4x5x-regmap.c

   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 0x8ffc
  16
  17 static 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(&buf_tx->cmd, val_len);
  34         memcpy(buf_tx->data, val, val_len);
  35
  36         return spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));
  37 }
  38
  39 static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
  40 {
  41         return tcan4x5x_regmap_gather_write(context, data, sizeof(__be32),
  42                                             data + sizeof(__be32),
  43                                             count - sizeof(__be32));
  44 }
  45
  46 static 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(&msg);
  63         spi_message_add_tail(&xfer[0], &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(&buf_tx->cmd, 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(&xfer[1], &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, &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
  93 static const struct regmap_range tcan4x5x_reg_table_yes_range[] = {
  94         regmap_reg_range(0x0000, 0x002c),       /* Device ID and SPI Registers */
  95         regmap_reg_range(0x0800, 0x083c),       /* Device configuration registers and Interrupt Flags*/
  96         regmap_reg_range(0x1000, 0x10fc),       /* M_CAN */
  97         regmap_reg_range(0x8000, 0x87fc),       /* MRAM */
  98 };
  99
 100 static const struct regmap_access_table tcan4x5x_reg_table = {
 101         .yes_ranges = tcan4x5x_reg_table_yes_range,
 102         .n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_yes_range),
 103 };
 104
 105 static const struct regmap_config tcan4x5x_regmap = {
 106         .reg_bits = 24,
 107         .reg_stride = 4,
 108         .pad_bits = 8,
 109         .val_bits = 32,
 110         .wr_table = &tcan4x5x_reg_table,
 111         .rd_table = &tcan4x5x_reg_table,
 112         .max_register = TCAN4X5X_MAX_REGISTER,
 113         .cache_type = REGCACHE_NONE,
 114         .read_flag_mask = (__force unsigned long)
 115                 cpu_to_be32(TCAN4X5X_SPI_INSTRUCTION_READ),
 116         .write_flag_mask = (__force unsigned long)
 117                 cpu_to_be32(TCAN4X5X_SPI_INSTRUCTION_WRITE),
 118 };
 119
 120 static const struct regmap_bus tcan4x5x_bus = {
 121         .write = tcan4x5x_regmap_write,
 122         .gather_write = tcan4x5x_regmap_gather_write,
 123         .read = tcan4x5x_regmap_read,
 124         .reg_format_endian_default = REGMAP_ENDIAN_BIG,
 125         .val_format_endian_default = REGMAP_ENDIAN_BIG,
 126         .max_raw_read = 256,
 127         .max_raw_write = 256,
 128 };
 129
 130 int tcan4x5x_regmap_init(struct tcan4x5x_priv *priv)
 131 {
 132         priv->regmap = devm_regmap_init(&priv->spi->dev, &tcan4x5x_bus,
 133                                         priv->spi, &tcan4x5x_regmap);
 134         return PTR_ERR_OR_ZERO(priv->regmap);
 135 }