SRAM0 window begins with a block of memory, usually of size PAGE_SIZE,
dedicated to the base firmware registers. When debugging firmware, it is
desirable to be able to dump them at will.
Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
---
sound/soc/intel/avs/debugfs.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/sound/soc/intel/avs/debugfs.c b/sound/soc/intel/avs/debugfs.c
index e7b0b99824aa..e9042d4328c4 100644
--- a/sound/soc/intel/avs/debugfs.c
+++ b/sound/soc/intel/avs/debugfs.c
@@ -48,6 +48,29 @@ void avs_dump_fw_log_wakeup(struct avs_dev *adev, const void __iomem *src, unsig
wake_up(&adev->trace_waitq);
}
+static ssize_t fw_regs_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
+{
+ struct avs_dev *adev = file->private_data;
+ char *buf;
+ int ret;
+
+ buf = kzalloc(AVS_FW_REGS_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ memcpy_fromio(buf, avs_sram_addr(adev, AVS_FW_REGS_WINDOW), AVS_FW_REGS_SIZE);
+
+ ret = simple_read_from_buffer(to, count, ppos, buf, AVS_FW_REGS_SIZE);
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations fw_regs_fops = {
+ .open = simple_open,
+ .read = fw_regs_read,
+ .llseek = no_llseek,
+};
+
static ssize_t probe_points_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
{
struct avs_dev *adev = file->private_data;
@@ -369,6 +392,7 @@ void avs_debugfs_init(struct avs_dev *adev)
debugfs_create_file("strace", 0444, adev->debugfs_root, adev, &strace_fops);
debugfs_create_file("trace_control", 0644, adev->debugfs_root, adev, &trace_control_fops);
+ debugfs_create_file("fw_regs", 0444, adev->debugfs_root, adev, &fw_regs_fops);
debugfs_create_u32("trace_aging_period", 0644, adev->debugfs_root,
&adev->aging_timer_period);
--
2.25.1
