util/sconfig: Add support for discontiguous FW_CONFIG fields

Sooner or later, some board was going to need extra FW_CONFIG bits for
a field that was already in production, so this patch adds support for
adding extra (unused) bits to a field.

The extra are appended via a syntax like:
`field FIELD_NAME START0 END0 | START1 END1 | START2 END2 ...`
and the suffixed bits are all treated as if they are contiguous when
defining option values.

BUG=b:185190978
TEST=Modified volteer fw_config to the following:
field AUDIO 8 10 | 29 29 | 31 31
        option NONE 0
	option MAX98357_ALC5682I_I2S 1
        option MAX98373_ALC5682I_I2S 2
	option MAX98373_ALC5682_SNDW 3
        option MAX98373_ALC5682I_I2S_UP4 4
        option MAX98360_ALC5682I_I2S 5
        option RT1011_ALC5682I_I2S 6
        option AUDIO_FOO 7
	option AUDIO_BAR 8
        option AUDIO_QUUX 9
        option AUDIO_BLAH1 10
        option AUDIO_BLAH2 15
        option AUDIO_BLAH3 16
        option AUDIO_BLAH4 31
end

which yielded (in static_fw_config.h):
 FW_CONFIG_FIELD_AUDIO_MASK 0xa0000700
 FW_CONFIG_FIELD_AUDIO_OPTION_NONE_VALUE 0x0
 FW_CONFIG_FIELD_AUDIO_OPTION_MAX98357_ALC5682I_I2S_VALUE 0x100
 FW_CONFIG_FIELD_AUDIO_OPTION_MAX98373_ALC5682I_I2S_VALUE 0x200
 FW_CONFIG_FIELD_AUDIO_OPTION_MAX98373_ALC5682_SNDW_VALUE 0x300
 FW_CONFIG_FIELD_AUDIO_OPTION_MAX98373_ALC5682I_I2S_UP4_VALUE 0x400
 FW_CONFIG_FIELD_AUDIO_OPTION_MAX98360_ALC5682I_I2S_VALUE 0x500
 FW_CONFIG_FIELD_AUDIO_OPTION_RT1011_ALC5682I_I2S_VALUE 0x600
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_FOO_VALUE 0x700
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_BAR_VALUE 0x20000000
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_QUUX_VALUE 0x20000100
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_BLAH1_VALUE 0x20000200
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_BLAH2_VALUE 0x20000700
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_BLAH3_VALUE 0x80000000
 FW_CONFIG_FIELD_AUDIO_OPTION_AUDIO_BLAH4_VALUE 0xa0000700

Change-Id: I5ed76706347ee9642198efc77139abdc3af1b8a6
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52747
Reviewed-by: Duncan Laurie <duncan@iceblink.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/sconfig/sconfig.y

@@ -11,6 +11,7 @@ void yyerror(const char *s);
 static struct bus *cur_parent;
 static struct chip_instance *cur_chip_instance;
 static struct fw_config_field *cur_field;
+static struct fw_config_field_bits *cur_bits;
 
 %}
 %union {
@@ -20,7 +21,7 @@ static struct fw_config_field *cur_field;
 	uint64_t number;
 }
 
-%token CHIP DEVICE REGISTER ALIAS REFERENCE ASSOCIATION BOOL STATUS MANDATORY BUS RESOURCE END EQUALS HEX STRING PCI PNP I2C APIC CPU_CLUSTER CPU DOMAIN IRQ DRQ SLOT_DESC IO NUMBER SUBSYSTEMID INHERIT IOAPIC_IRQ IOAPIC PCIINT GENERIC SPI USB MMIO LPC ESPI GPIO FW_CONFIG_TABLE FW_CONFIG_FIELD FW_CONFIG_OPTION FW_CONFIG_PROBE
+%token CHIP DEVICE REGISTER ALIAS REFERENCE ASSOCIATION BOOL STATUS MANDATORY BUS RESOURCE END EQUALS HEX STRING PCI PNP I2C APIC CPU_CLUSTER CPU DOMAIN IRQ DRQ SLOT_DESC IO NUMBER SUBSYSTEMID INHERIT IOAPIC_IRQ IOAPIC PCIINT GENERIC SPI USB MMIO LPC ESPI GPIO FW_CONFIG_TABLE FW_CONFIG_FIELD FW_CONFIG_OPTION FW_CONFIG_PROBE PIPE
 %%
 devtree: { cur_parent = root_parent; } | devtree chip | devtree fw_config_table;
 
@@ -97,23 +98,32 @@ fw_config_table_children: fw_config_table_children fw_config_field | /* empty */
 /* field -> option */
 fw_config_field_children: fw_config_field_children fw_config_option | /* empty */ ;
 
-/* field <start-bit> <end-bit> */
-fw_config_field: FW_CONFIG_FIELD STRING NUMBER /* == start bit */ NUMBER /* == end bit */ {
-	cur_field = new_fw_config_field($<string>2, strtoul($<string>3, NULL, 0), strtoul($<string>4, NULL, 0));
-}
-	fw_config_field_children END { };
+/* <start-bit> <end-bit> */
+fw_config_field_bits: NUMBER /* == start bit */ NUMBER /* == end bit */
+{
+	append_fw_config_bits(&cur_bits, strtoul($<string>1, NULL, 0), strtoul($<string>2, NULL, 0));
+};
+
+/* field <start-bit> <end-bit>(| <start-bit> <end-bit>)* */
+fw_config_field_bits_repeating: PIPE fw_config_field_bits fw_config_field_bits_repeating | /* empty */ ;
+
+fw_config_field: FW_CONFIG_FIELD STRING fw_config_field_bits fw_config_field_bits_repeating
+	{ cur_field = new_fw_config_field($<string>2, cur_bits); }
+	fw_config_field_children END { cur_bits = NULL; };
 
 /* field <bit> (for single-bit fields) */
 fw_config_field: FW_CONFIG_FIELD STRING NUMBER /* == bit */ {
-	cur_field = new_fw_config_field($<string>2, strtoul($<string>3, NULL, 0), strtoul($<string>3, NULL, 0));
+	cur_bits = NULL;
+	append_fw_config_bits(&cur_bits, strtoul($<string>3, NULL, 0), strtoul($<string>3, NULL, 0));
+	cur_field = new_fw_config_field($<string>2, cur_bits);
 }
-	fw_config_field_children END { };
+	fw_config_field_children END { cur_bits = NULL; };
 
 /* field (for adding options to an existing field) */
 fw_config_field: FW_CONFIG_FIELD STRING {
 	cur_field = get_fw_config_field($<string>2);
 }
-	fw_config_field_children END { };
+	fw_config_field_children END { cur_bits = NULL; };
 
 /* option <value> */
 fw_config_option: FW_CONFIG_OPTION STRING NUMBER /* == field value */