diff options
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/axis-fifo/axis-fifo.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c index 7897434f2441..57ed58065eba 100644 --- a/drivers/staging/axis-fifo/axis-fifo.c +++ b/drivers/staging/axis-fifo/axis-fifo.c @@ -33,6 +33,7 @@ #include <linux/uaccess.h> #include <linux/jiffies.h> #include <linux/miscdevice.h> +#include <linux/debugfs.h> /* ---------------------------- * driver parameters @@ -44,6 +45,8 @@ #define READ_BUF_SIZE 128U /* read buffer length in words */ #define WRITE_BUF_SIZE 128U /* write buffer length in words */ +#define AXIS_FIFO_DEBUG_REG_NAME_MAX_LEN 4 + /* ---------------------------- * IP register offsets * ---------------------------- @@ -137,6 +140,13 @@ struct axis_fifo { struct device *dt_device; /* device created from the device tree */ struct miscdevice miscdev; + + struct dentry *debugfs_dir; +}; + +struct axis_fifo_debug_reg { + const char * const name; + unsigned int offset; }; /* ---------------------------- @@ -537,6 +547,37 @@ static const struct file_operations fops = { .write = axis_fifo_write }; +static int axis_fifo_debugfs_regs_show(struct seq_file *m, void *p) +{ + static const struct axis_fifo_debug_reg regs[] = { + {"isr", XLLF_ISR_OFFSET}, + {"ier", XLLF_IER_OFFSET}, + {"tdfv", XLLF_TDFV_OFFSET}, + {"rdfo", XLLF_RDFO_OFFSET}, + { /* Sentinel */ }, + }; + const struct axis_fifo_debug_reg *reg; + struct axis_fifo *fifo = m->private; + + for (reg = regs; reg->name; ++reg) { + u32 val = ioread32(fifo->base_addr + reg->offset); + + seq_printf(m, "%*s: 0x%08x\n", AXIS_FIFO_DEBUG_REG_NAME_MAX_LEN, + reg->name, val); + } + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(axis_fifo_debugfs_regs); + +static void axis_fifo_debugfs_init(struct axis_fifo *fifo) +{ + fifo->debugfs_dir = debugfs_create_dir(dev_name(fifo->dt_device), NULL); + + debugfs_create_file("regs", 0444, fifo->debugfs_dir, fifo, + &axis_fifo_debugfs_regs_fops); +} + /* read named property from the device tree */ static int get_dts_property(struct axis_fifo *fifo, char *name, unsigned int *var) @@ -708,6 +749,8 @@ static int axis_fifo_probe(struct platform_device *pdev) if (rc < 0) goto err_initial; + axis_fifo_debugfs_init(fifo); + return 0; err_initial: @@ -720,6 +763,7 @@ static void axis_fifo_remove(struct platform_device *pdev) struct device *dev = &pdev->dev; struct axis_fifo *fifo = dev_get_drvdata(dev); + debugfs_remove(fifo->debugfs_dir); misc_deregister(&fifo->miscdev); dev_set_drvdata(dev, NULL); } |