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@intel.com --- 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);