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path: root/drivers/net/can/m_can/tcan4x5x-regmap.c
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Diffstat (limited to 'drivers/net/can/m_can/tcan4x5x-regmap.c')
-rw-r--r--drivers/net/can/m_can/tcan4x5x-regmap.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/net/can/m_can/tcan4x5x-regmap.c b/drivers/net/can/m_can/tcan4x5x-regmap.c
new file mode 100644
index 000000000000..ca80dbaf7a3f
--- /dev/null
+++ b/drivers/net/can/m_can/tcan4x5x-regmap.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// tcan4x5x - Texas Instruments TCAN4x5x Family CAN controller driver
+//
+// Copyright (c) 2020 Pengutronix,
+// Marc Kleine-Budde <kernel@pengutronix.de>
+// Copyright (c) 2018-2019 Texas Instruments Incorporated
+// http://www.ti.com/
+
+#include "tcan4x5x.h"
+
+#define TCAN4X5X_SPI_INSTRUCTION_WRITE (0x61 << 24)
+#define TCAN4X5X_SPI_INSTRUCTION_READ (0x41 << 24)
+
+#define TCAN4X5X_MAX_REGISTER 0x8ffc
+
+static int tcan4x5x_regmap_gather_write(void *context,
+ const void *reg, size_t reg_len,
+ const void *val, size_t val_len)
+{
+ struct spi_device *spi = context;
+ struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
+ struct tcan4x5x_map_buf *buf_tx = &priv->map_buf_tx;
+ struct spi_transfer xfer[] = {
+ {
+ .tx_buf = buf_tx,
+ .len = sizeof(buf_tx->cmd) + val_len,
+ },
+ };
+
+ memcpy(&buf_tx->cmd, reg, sizeof(buf_tx->cmd.cmd) +
+ sizeof(buf_tx->cmd.addr));
+ tcan4x5x_spi_cmd_set_len(&buf_tx->cmd, val_len);
+ memcpy(buf_tx->data, val, val_len);
+
+ return spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));
+}
+
+static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
+{
+ return tcan4x5x_regmap_gather_write(context, data, sizeof(__be32),
+ data + sizeof(__be32),
+ count - sizeof(__be32));
+}
+
+static int tcan4x5x_regmap_read(void *context,
+ const void *reg_buf, size_t reg_len,
+ void *val_buf, size_t val_len)
+{
+ struct spi_device *spi = context;
+ struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
+ struct tcan4x5x_map_buf *buf_rx = &priv->map_buf_rx;
+ struct tcan4x5x_map_buf *buf_tx = &priv->map_buf_tx;
+ struct spi_transfer xfer[2] = {
+ {
+ .tx_buf = buf_tx,
+ }
+ };
+ struct spi_message msg;
+ int err;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer[0], &msg);
+
+ memcpy(&buf_tx->cmd, reg_buf, sizeof(buf_tx->cmd.cmd) +
+ sizeof(buf_tx->cmd.addr));
+ tcan4x5x_spi_cmd_set_len(&buf_tx->cmd, val_len);
+
+ if (spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX) {
+ xfer[0].len = sizeof(buf_tx->cmd);
+
+ xfer[1].rx_buf = val_buf;
+ xfer[1].len = val_len;
+ spi_message_add_tail(&xfer[1], &msg);
+ } else {
+ xfer[0].rx_buf = buf_rx;
+ xfer[0].len = sizeof(buf_tx->cmd) + val_len;
+
+ if (TCAN4X5X_SANITIZE_SPI)
+ memset(buf_tx->data, 0x0, val_len);
+ }
+
+ err = spi_sync(spi, &msg);
+ if (err)
+ return err;
+
+ if (!(spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX))
+ memcpy(val_buf, buf_rx->data, val_len);
+
+ return 0;
+}
+
+static const struct regmap_range tcan4x5x_reg_table_yes_range[] = {
+ regmap_reg_range(0x0000, 0x002c), /* Device ID and SPI Registers */
+ regmap_reg_range(0x0800, 0x083c), /* Device configuration registers and Interrupt Flags*/
+ regmap_reg_range(0x1000, 0x10fc), /* M_CAN */
+ regmap_reg_range(0x8000, 0x87fc), /* MRAM */
+};
+
+static const struct regmap_access_table tcan4x5x_reg_table = {
+ .yes_ranges = tcan4x5x_reg_table_yes_range,
+ .n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_yes_range),
+};
+
+static const struct regmap_config tcan4x5x_regmap = {
+ .reg_bits = 24,
+ .reg_stride = 4,
+ .pad_bits = 8,
+ .val_bits = 32,
+ .wr_table = &tcan4x5x_reg_table,
+ .rd_table = &tcan4x5x_reg_table,
+ .max_register = TCAN4X5X_MAX_REGISTER,
+ .cache_type = REGCACHE_NONE,
+ .read_flag_mask = (__force unsigned long)
+ cpu_to_be32(TCAN4X5X_SPI_INSTRUCTION_READ),
+ .write_flag_mask = (__force unsigned long)
+ cpu_to_be32(TCAN4X5X_SPI_INSTRUCTION_WRITE),
+};
+
+static const struct regmap_bus tcan4x5x_bus = {
+ .write = tcan4x5x_regmap_write,
+ .gather_write = tcan4x5x_regmap_gather_write,
+ .read = tcan4x5x_regmap_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_BIG,
+ .val_format_endian_default = REGMAP_ENDIAN_BIG,
+ .max_raw_read = 256,
+ .max_raw_write = 256,
+};
+
+int tcan4x5x_regmap_init(struct tcan4x5x_priv *priv)
+{
+ priv->regmap = devm_regmap_init(&priv->spi->dev, &tcan4x5x_bus,
+ priv->spi, &tcan4x5x_regmap);
+ return PTR_ERR_OR_ZERO(priv->regmap);
+}