rockchip: rk3576: Add SPI Flash boot support

The bootsource ids reported by BootROM of RK3576 for SPI NOR and USB
differs slightly compared to prior SoCs:

- Booting from sfc0 (ROCK 4D) report the normal bootsource id 0x3.
- Booting from sfc1 M1 (NanoPi M5) report a new bootsource id 0x23.
- Booting from sfc1 M0 has not been tested (no board using this config).
- Booting from USB report a new bootsource id 0x81.

Add a RK3576 specific read_brom_bootsource_id() function to help decode
the new bootsource id values and the required boot_devices mapping of
sfc0 and sfc1 to help support booting from SPI flash on RK3576.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rk3576-u-boot.dtsi

@@ -6,6 +6,11 @@
 #include "rockchip-u-boot.dtsi"
 
 / {
+	aliases {
+		spi5 = &sfc0;
+		spi6 = &sfc1;
+	};
+
 	chosen {
 		u-boot,spl-boot-order = "same-as-spl", &sdmmc, &sdhci;
 	};
@@ -16,6 +21,17 @@
 	};
 };
 
+#ifdef CONFIG_ROCKCHIP_SPI_IMAGE
+&binman {
+	simple-bin-spi {
+		mkimage {
+			args = "-n", CONFIG_SYS_SOC, "-T", "rksd";
+			offset = <0x8000>;
+		};
+	};
+};
+#endif
+
 &cru {
 	bootph-all;
 };
@@ -45,6 +61,26 @@
 	bootph-some-ram;
 };
 
+&fspi0_csn0 {
+	bootph-pre-ram;
+	bootph-some-ram;
+};
+
+&fspi0_pins {
+	bootph-pre-ram;
+	bootph-some-ram;
+};
+
+&fspi1m1_csn0 {
+	bootph-pre-ram;
+	bootph-some-ram;
+};
+
+&fspi1m1_pins {
+	bootph-pre-ram;
+	bootph-some-ram;
+};
+
 &ioc_grf {
 	bootph-all;
 };
@@ -116,6 +152,16 @@
 	bootph-some-ram;
 };
 
+&sfc0 {
+	bootph-some-ram;
+	u-boot,spl-sfc-no-dma;
+};
+
+&sfc1 {
+	bootph-some-ram;
+	u-boot,spl-sfc-no-dma;
+};
+
 &sys_grf {
 	bootph-all;
 };

arch/arm/mach-rockchip/rk3576/rk3576.c

@@ -36,8 +36,15 @@
 #define USB_GRF_BASE		0x2601E000
 #define USB3OTG0_CON1		0x0030
 
+enum {
+	BROM_BOOTSOURCE_FSPI0 = 3,
+	BROM_BOOTSOURCE_FSPI1_M1 = 6,
+};
+
 const char * const boot_devices[BROM_LAST_BOOTSOURCE + 1] = {
 	[BROM_BOOTSOURCE_EMMC] = "/soc/mmc@2a330000",
+	[BROM_BOOTSOURCE_FSPI0] = "/soc/spi@2a340000/flash@0",
+	[BROM_BOOTSOURCE_FSPI1_M1] = "/soc/spi@2a300000/flash@0",
 	[BROM_BOOTSOURCE_SD] = "/soc/mmc@2a310000",
 };
 
@@ -85,6 +92,24 @@ void board_debug_uart_init(void)
 {
 }
 
+u32 read_brom_bootsource_id(void)
+{
+	u32 bootsource_id = readl(BROM_BOOTSOURCE_ID_ADDR);
+
+	/* Re-map the raw value read from reg to a redefined or existing
+	 * BROM_BOOTSOURCE enum value to avoid having to create a larger
+	 * boot_devices table.
+	 */
+	if (bootsource_id == 0x23)
+		return BROM_BOOTSOURCE_FSPI1_M1;
+	else if (bootsource_id == 0x81)
+		return BROM_BOOTSOURCE_USB;
+	else if (bootsource_id > BROM_LAST_BOOTSOURCE)
+		log_debug("Unknown bootsource %x\n", bootsource_id);
+
+	return bootsource_id;
+}
+
 #define HP_TIMER_BASE			CONFIG_ROCKCHIP_STIMER_BASE
 #define HP_CTRL_REG			0x04
 #define TIMER_EN			BIT(0)