On 21.06.22 22:02, Daniel Brát wrote:
> Refactoring and cleanup of vc fdt parsing based on advice
> from Ahmad Fatoum.
>
> Signed-off-by: Daniel Brát <danek.brat@xxxxxxxxx>
Reviewed-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
> I originally wanted to send these as part of v5 of
> 'ARM: rpi: parse useful data from vc fdt' patch, but you
> were quicker with accepting the v4 :)
> Hope that's not a problem.
Original patch is in next, so this should be squashable.
>
> arch/arm/boards/raspberry-pi/rpi-common.c | 114 +++++++++++-----------
> 1 file changed, 58 insertions(+), 56 deletions(-)
>
> diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c
> index eaca4edef..77935e5c8 100644
> --- a/arch/arm/boards/raspberry-pi/rpi-common.c
> +++ b/arch/arm/boards/raspberry-pi/rpi-common.c
> @@ -202,22 +202,52 @@ static int rpi_env_init(void)
> }
>
> /* Some string properties in fdt passed to us from vc may be
> - * malformed by not being null terminated. In that case, create and
> - * return a null terminated copy.
> + * malformed by not being null terminated, so just create and
> + * return a fixed copy.
> */
> static char *of_read_vc_string(struct device_node *node,
> - const char *prop_name,
> - bool *is_dyn)
> + const char *prop_name)
> {
> int len;
> - char *str;
> + const char *str;
>
> - str = (char *)of_get_property(node, prop_name, &len);
> - if (!str || len <= 0)
> + str = of_get_property(node, prop_name, &len);
> + if (!str) {
> + pr_warn("no property '%s' found in vc fdt's '%s' node\n",
> + prop_name, node->full_name);
> return NULL;
> - if (is_dyn)
> - *is_dyn = str[len - 1] != '\0';
> - return str[len - 1] == '\0' ? str : xstrndup(str, len);
> + }
> + return xstrndup(str, len);
> +}
> +
> +static enum reset_src_type rpi_decode_pm_rsts(struct device_node *chosen,
> + struct device_node *bootloader)
> +{
> + u32 pm_rsts;
> + int ret;
> +
> + ret = of_property_read_u32(chosen, "pm_rsts", &pm_rsts);
> + if (ret && bootloader)
> + ret = of_property_read_u32(bootloader, "rsts", &pm_rsts);
> +
> + if (ret) {
> + pr_warn("'pm_rsts' value not found in vc fdt\n");
> + return RESET_UKWN;
> + }
> + /*
> + * https://github.com/raspberrypi/linux/issues/932#issuecomment-93989581
> + */
> +
> + if (pm_rsts & PM_RSTS_HADPOR_SET)
> + return RESET_POR;
> + if (pm_rsts & PM_RSTS_HADDR_SET)
> + return RESET_JTAG;
> + if (pm_rsts & PM_RSTS_HADWR_SET)
> + return RESET_WDG;
> + if (pm_rsts & PM_RSTS_HADSR_SET)
> + return RESET_RST;
> +
> + return RESET_UKWN;
> }
>
> static u32 rpi_boot_mode, rpi_boot_part;
> @@ -229,31 +259,22 @@ static void rpi_vc_fdt_parse(void *fdt)
> {
> int ret;
> struct device_node *root, *chosen, *bootloader;
> - enum reset_src_type rst_src = RESET_UKWN;
> char *str;
> - bool is_dyn;
> - u32 pm_rsts;
>
> root = of_unflatten_dtb(fdt, INT_MAX);
> if (IS_ERR(root))
> return;
>
> - str = of_read_vc_string(root, "serial-number", &is_dyn);
> + str = of_read_vc_string(root, "serial-number");
> if (str) {
> barebox_set_serial_number(str);
> - if (is_dyn)
> - free(str);
> - } else {
> - pr_warn("no 'serial-number' property found in vc fdt root\n");
> + free(str);
> }
>
> - str = of_read_vc_string(root, "model", &is_dyn);
> + str = of_read_vc_string(root, "model");
> if (str) {
> barebox_set_model(str);
> - if (is_dyn)
> - free(str);
> - } else {
> - pr_warn("no 'model' property found in vc fdt root\n");
> + free(str);
> }
>
> chosen = of_find_node_by_path_from(root, "/chosen");
> @@ -264,23 +285,23 @@ static void rpi_vc_fdt_parse(void *fdt)
>
> bootloader = of_find_node_by_name(chosen, "bootloader");
>
> - str = of_read_vc_string(chosen, "bootargs", NULL);
> - if (str)
> + str = of_read_vc_string(chosen, "bootargs");
> + if (str) {
> globalvar_add_simple("vc.bootargs", str);
> - else
> - pr_warn("no 'bootargs' property found in vc fdt '/chosen'\n");
> + free(str);
> + }
>
> - str = of_read_vc_string(chosen, "overlay_prefix", NULL);
> - if (str)
> + str = of_read_vc_string(chosen, "overlay_prefix");
> + if (str) {
> globalvar_add_simple("vc.overlay_prefix", str);
> - else
> - pr_warn("no 'overlay_prefix' property found in vc fdt '/chosen'\n");
> + free(str);
> + }
>
> - str = of_read_vc_string(chosen, "os_prefix", NULL);
> - if (str)
> + str = of_read_vc_string(chosen, "os_prefix");
> + if (str) {
> globalvar_add_simple("vc.os_prefix", str);
> - else
> - pr_warn("no 'os_prefix' property found in vc fdt '/chosen'\n");
> + free(str);
> + }
>
> ret = of_property_read_u32(chosen, "boot-mode", &rpi_boot_mode);
> if (ret && bootloader)
> @@ -300,28 +321,9 @@ static void rpi_vc_fdt_parse(void *fdt)
> else
> globalvar_add_simple_int("vc.boot_partition", &rpi_boot_part, "%u");
>
> - if (IS_ENABLED(CONFIG_RESET_SOURCE)) {
> - ret = of_property_read_u32(chosen, "pm_rsts", &pm_rsts);
> - if (ret && bootloader)
> - ret = of_property_read_u32(bootloader, "rsts", &pm_rsts);
> + if (IS_ENABLED(CONFIG_RESET_SOURCE))
> + reset_source_set(rpi_decode_pm_rsts(chosen, bootloader));
>
> - if (ret) {
> - pr_warn("pm_rsts could not be get from vc fdt\n");
> - } else {
> -/*
> - * https://github.com/raspberrypi/linux/issues/932#issuecomment-93989581
> - */
> - if (pm_rsts & PM_RSTS_HADPOR_SET)
> - rst_src = RESET_POR;
> - else if (pm_rsts & PM_RSTS_HADDR_SET)
> - rst_src = RESET_JTAG;
> - else if (pm_rsts & PM_RSTS_HADWR_SET)
> - rst_src = RESET_WDG;
> - else if (pm_rsts & PM_RSTS_HADSR_SET)
> - rst_src = RESET_RST;
> - reset_source_set(rst_src);
> - }
> - }
> out:
> if (root)
> of_delete_node(root);
--
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