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mtd: rawnand: gpmi: add debugfs entry for BCH geometry

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Export the BCH geometry parameters via debugfs to aid debugging and
provide the necessary information for legacy kobs-ng tool. The debugfs
directory "gpmi-nand" is created under the root debugfs tree, exposing:

bch_geometry  - blob containing the struct bch_geometry fields
raw_mode      - flag indicating raw mode status

The implementation is guarded with #ifdef CONFIG_DEBUG_FS to avoid
build failures when debugfs is disabled.

Signed-off-by: Han Xu <han.xu@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Han Xu 2026-07-29 14:22:20 -05:00 committed by Miquel Raynal
parent e5e4152623
commit 113f62225e
2 changed files with 35 additions and 0 deletions
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29
drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
View File

@ -7,6 +7,7 @@
*/
#include <linux/cleanup.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/sched/task_stack.h>
@ -732,6 +733,31 @@ static int common_nfc_set_geometry(struct gpmi_nand_data *this)
return err;
}
#ifdef CONFIG_DEBUG_FS
static void bch_remove_debugfs(void *data)
{
struct gpmi_nand_data *this = data;
debugfs_remove_recursive(this->dbg_root);
this->dbg_root = NULL;
}
static void bch_create_debugfs(struct gpmi_nand_data *this)
{
struct bch_geometry *bch_geo = &this->bch_geometry;
this->dbg_root = debugfs_create_dir("gpmi-nand", NULL);
this->dbg_bch_geo.data = (void *)bch_geo;
this->dbg_bch_geo.size = sizeof(struct bch_geometry);
this->raw_mode = true;
debugfs_create_blob("bch_geometry", 0444, this->dbg_root, &this->dbg_bch_geo);
debugfs_create_bool("raw_mode", 0444, this->dbg_root, &this->raw_mode);
devm_add_action_or_reset(this->dev, bch_remove_debugfs, this);
}
#else
static void bch_create_debugfs(struct gpmi_nand_data *this) {}
#endif /* CONFIG_DEBUG_FS */
/* Configures the geometry for BCH. */
static int bch_set_geometry(struct gpmi_nand_data *this)
{
@ -2282,6 +2308,9 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
if (ret)
return ret;
/* save BCH geometry to debugfs if CONFIG_DEBUG_FS is enabled */
bch_create_debugfs(this);
/* Init the nand_ecc_ctrl{} */
ecc->read_page = gpmi_ecc_read_page;
ecc->write_page = gpmi_ecc_write_page;

6
drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h
View File

@ -161,6 +161,12 @@ struct gpmi_nand_data {
#define DMA_CHANS 8
struct dma_chan *dma_chans[DMA_CHANS];
struct completion dma_done;
#ifdef CONFIG_DEBUG_FS
struct dentry *dbg_root;
struct debugfs_blob_wrapper dbg_bch_geo;
bool raw_mode;
#endif
};
/* BCH : Status Block Completion Codes */