diff options
Diffstat (limited to 'drivers/net/can/spi/mcp25xxfd/mcp25xxfd_debugfs.c')
| -rw-r--r-- | drivers/net/can/spi/mcp25xxfd/mcp25xxfd_debugfs.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_debugfs.c b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_debugfs.c new file mode 100644 index 000000000000..20969c76db46 --- /dev/null +++ b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_debugfs.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface + * + * Copyright 2019 Martin Sperl <kernel@martin.sperl.org> + */ + +#include <linux/debugfs.h> +#include <linux/kernel.h> +#include <linux/seq_file.h> + +#include "mcp25xxfd_cmd.h" +#include "mcp25xxfd_debugfs.h" +#include "mcp25xxfd_priv.h" + +static int mcp25xxfd_debugfs_dump_regs_range(struct seq_file *file, + u32 start, u32 end) +{ + struct spi_device *spi = file->private; + u32 data[32]; + int bytes = end - start + sizeof(*data); + int i, l, count, ret; + + for (count = bytes / sizeof(*data); count > 0; count -= 32) { + /* read up to 32 registers in one go */ + l = min(count, 32); + ret = mcp25xxfd_cmd_read_regs(spi, start, + data, l * sizeof(*data)); + if (ret) + return ret; + /* dump those read registers */ + for (i = 0; i < l; i++, start += sizeof(*data)) + seq_printf(file, "Reg 0x%03x = 0x%08x\n", + start, data[i]); + } + + return 0; +} + +static int mcp25xxfd_debugfs_dump_regs(struct seq_file *file, void *offset) +{ + return mcp25xxfd_debugfs_dump_regs_range(file, MCP25XXFD_OSC, + MCP25XXFD_DEVID); +} + +static int mcp25xxfd_debugfs_dump_can_regs(struct seq_file *file, + void *offset) +{ + return mcp25xxfd_debugfs_dump_regs_range(file, MCP25XXFD_CAN_CON, + MCP25XXFD_CAN_TXQUA); +} + +static int mcp25xxfd_debugfs_dump_can_all_regs(struct seq_file *file, + void *offset) +{ + return mcp25xxfd_debugfs_dump_regs_range(file, MCP25XXFD_CAN_CON, + MCP25XXFD_CAN_FLTMASK(31)); +} + +static void mcp25xxfd_debugfs_mod_setup(struct mcp25xxfd_priv *priv) +{ + struct dentry *root, *regs; + + /* the base directory */ + priv->debugfs_dir = debugfs_create_dir(priv->device_name, NULL); + root = priv->debugfs_dir; + + /* expose some parameters related to clocks */ + debugfs_create_u32("spi_setup_speed_hz", 0644, root, + &priv->spi_setup_speed_hz); + debugfs_create_u32("spi_normal_speed_hz", 0644, root, + &priv->spi_normal_speed_hz); + debugfs_create_u32("spi_use_speed_hz", 0644, root, + &priv->spi_use_speed_hz); + debugfs_create_u32("clk_user_mask", 0444, root, &priv->clk_user_mask); + + /* some statistics */ + debugfs_create_u64("spi_crc_read", 0444, root, + &priv->stats.spi_crc_read); + debugfs_create_u64("spi_crc_read_split", 0444, root, + &priv->stats.spi_crc_read_split); + + /* expose the system registers */ + priv->debugfs_regs_dir = debugfs_create_dir("regs", root); + regs = priv->debugfs_regs_dir; + debugfs_create_x32("osc", 0444, regs, &priv->regs.osc); + debugfs_create_x32("iocon", 0444, regs, &priv->regs.iocon); + debugfs_create_x32("crc", 0444, regs, &priv->regs.crc); + debugfs_create_x32("ecccon", 0444, regs, &priv->regs.ecccon); + + /* dump the controller registers themselves */ + debugfs_create_devm_seqfile(&priv->spi->dev, "regs_live_dump", + root, mcp25xxfd_debugfs_dump_regs); + /* and the essential can registers */ + debugfs_create_devm_seqfile(&priv->spi->dev, "can_regs_live_dump", + root, mcp25xxfd_debugfs_dump_can_regs); + /* and the complete can registers */ + debugfs_create_devm_seqfile(&priv->spi->dev, + "can_regs_all_live_dump", root, + mcp25xxfd_debugfs_dump_can_all_regs); +} + +void mcp25xxfd_debugfs_setup(struct mcp25xxfd_priv *priv) +{ + mcp25xxfd_debugfs_mod_setup(priv); +} + +void mcp25xxfd_debugfs_remove(struct mcp25xxfd_priv *priv) +{ + debugfs_remove_recursive(priv->debugfs_dir); + priv->debugfs_dir = NULL; +} |