sw: Properly mask syscon register fields

Some fields might get extended with extra bits, use the appropriate
masks when reading the values.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

include/microwatt_soc.h

@@ -25,8 +25,11 @@
 #define   SYS_REG_INFO_HAS_DRAM 		(1ull << 1)
 #define   SYS_REG_INFO_HAS_BRAM 		(1ull << 2)
 #define SYS_REG_BRAMINFO		0x10
+#define   SYS_REG_BRAMINFO_SIZE_MASK		0xfffffffffffffull
 #define SYS_REG_DRAMINFO		0x18
+#define   SYS_REG_DRAMINFO_SIZE_MASK		0xfffffffffffffull
 #define SYS_REG_CLKINFO			0x20
+#define   SYS_REG_CLKINFO_FREQ_MASK		0xffffffffffull
 #define SYS_REG_CTRL			0x28
 #define   SYS_REG_CTRL_DRAM_AT_0		(1ull << 0)
 #define   SYS_REG_CTRL_CORE_RESET		(1ull << 1)

lib/console.c

@@ -75,7 +75,7 @@ void potato_uart_init(void)
 	uint64_t proc_freq;
 
 	potato_uart_base = UART_BASE;
-	proc_freq = readq(SYSCON_BASE + SYS_REG_CLKINFO);
+	proc_freq = readq(SYSCON_BASE + SYS_REG_CLKINFO) & SYS_REG_CLKINFO_FREQ_MASK;
 
 	potato_uart_reg_write(POTATO_CONSOLE_CLOCK_DIV, potato_uart_divisor(proc_freq, UART_FREQ));
 }

litedram/gen-src/sdram_init/main.c

@@ -58,16 +58,16 @@ void main(void)
 		printf("BRAM ");
 	printf("\n");
 	if (ftr & SYS_REG_INFO_HAS_BRAM) {
-		val = readq(SYSCON_BASE + SYS_REG_BRAMINFO);
+		val = readq(SYSCON_BASE + SYS_REG_BRAMINFO) & SYS_REG_BRAMINFO_SIZE_MASK;
 		printf("          BRAM: %lld KB\n", val / 1024);
 	}
 	if (ftr & SYS_REG_INFO_HAS_DRAM) {
-		val = readq(SYSCON_BASE + SYS_REG_DRAMINFO);
+		val = readq(SYSCON_BASE + SYS_REG_DRAMINFO) & SYS_REG_DRAMINFO_SIZE_MASK;
 		printf("          DRAM: %lld MB\n", val / (1024 * 1024));
 		val = readq(SYSCON_BASE + SYS_REG_DRAMINITINFO);
 		printf("     DRAM INIT: %lld KB\n", val / 1024);
 	}
-	val = readq(SYSCON_BASE + SYS_REG_CLKINFO);
+	val = readq(SYSCON_BASE + SYS_REG_CLKINFO) & SYS_REG_CLKINFO_FREQ_MASK;
 	printf("           CLK: %lld MHz\n", val / 1000000);
 
 	printf("\n");