On Mon, Mar 21, 2022 at 03:13:51PM +0700, Quan Nguyen wrote:
This commit adds driver support for accessing various information
reported by Ampere's SMpro co-processor such as Boot Progress and
other miscellaneous data.
Signed-off-by: Quan Nguyen <quan@xxxxxxxxxxxxxxxxxxxxxx>
No Documentation/ABI/ entries for your sysfs file?
Thanks, Greg.+static ssize_t boot_progress_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+ struct smpro_misc *misc = dev_get_drvdata(dev);
+ u32 boot_progress;
+ u8 current_stage;
+ u8 boot_status;
+ u8 boot_stage;
+ u32 select;
+ u32 reg_lo;
+ u32 reg;
+ int ret;
+
+ /* Read current boot stage */
+ ret = regmap_read(misc->regmap, BOOTSTAGE_CUR_STAGE, ®);
+ if (ret)
+ return ret;
+
+ current_stage = reg & 0xff;
+
+ /* Read the boot progress */
+ ret = regmap_read(misc->regmap, BOOTSTAGE_SELECT, &select);
+ if (ret)
+ return ret;
+
+ boot_stage = (select >> 8) & 0xff;
+ boot_status = select & 0xff;
+
+ if (boot_stage > current_stage)
+ return -EINVAL;
+
+ ret = regmap_read(misc->regmap, BOOTSTAGE_STATUS_LO, ®_lo);
+ if (!ret)
+ ret = regmap_read(misc->regmap, BOOTSTAGE_STATUS_HI, ®);
+ if (ret)
+ return ret;
+
+ boot_progress = swab16(reg) << 16 | swab16(reg_lo);
+
+ /* Tell firmware to provide next boot stage next time */
+ if (boot_stage < current_stage) {
+ ret = regmap_write(misc->regmap, BOOTSTAGE_SELECT, ((select & 0xff00) | 0x1));
+ if (ret)
+ return ret;
+ }
+
+ return snprintf(buf, PAGE_SIZE, "0x%02x 0x%02x 0x%08x\n",
+ boot_stage, boot_status, boot_progress);
sysfs_emit() please.
Also, this is 3 different things, put all of these in different sysfs
files.
thanks,
greg k-h