diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/pl330.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index eec79fdf27a5..c72f6fd79c43 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -11,6 +11,7 @@ * (at your option) any later version. */ +#include <linux/debugfs.h> #include <linux/kernel.h> #include <linux/io.h> #include <linux/init.h> @@ -2896,6 +2897,55 @@ static irqreturn_t pl330_irq_handler(int irq, void *data) BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) +#ifdef CONFIG_DEBUG_FS +static int pl330_debugfs_show(struct seq_file *s, void *data) +{ + struct pl330_dmac *pl330 = s->private; + int chans, pchs, ch, pr; + + chans = pl330->pcfg.num_chan; + pchs = pl330->num_peripherals; + + seq_puts(s, "PL330 physical channels:\n"); + seq_puts(s, "THREAD:\t\tCHANNEL:\n"); + seq_puts(s, "--------\t-----\n"); + for (ch = 0; ch < chans; ch++) { + struct pl330_thread *thrd = &pl330->channels[ch]; + int found = -1; + + for (pr = 0; pr < pchs; pr++) { + struct dma_pl330_chan *pch = &pl330->peripherals[pr]; + + if (!pch->thread || thrd->id != pch->thread->id) + continue; + + found = pr; + } + + seq_printf(s, "%d\t\t", thrd->id); + if (found == -1) + seq_puts(s, "--\n"); + else + seq_printf(s, "%d\n", found); + } + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(pl330_debugfs); + +static inline void init_pl330_debugfs(struct pl330_dmac *pl330) +{ + debugfs_create_file(dev_name(pl330->ddma.dev), + S_IFREG | 0444, NULL, pl330, + &pl330_debugfs_fops); +} +#else +static inline void init_pl330_debugfs(struct pl330_dmac *pl330) +{ +} +#endif + /* * Runtime PM callbacks are provided by amba/bus.c driver. * @@ -3082,6 +3132,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) dev_err(&adev->dev, "unable to set the seg size\n"); + init_pl330_debugfs(pl330); dev_info(&adev->dev, "Loaded driver for PL330 DMAC-%x\n", adev->periphid); dev_info(&adev->dev, |