zynq: Add support to find bootmode

Added support to find the bootmodes by reading
slcr bootmode register. this can be helpful to
autoboot the configurations w.r.t a specified bootmode.

Added this functionality on board_late_init as it's not
needed for normal initializtion part.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

arch/arm/cpu/armv7/zynq/slcr.c

@@ -101,6 +101,12 @@ void zynq_slcr_devcfg_enable(void)
 	zynq_slcr_lock();
 }
 
+u32 zynq_slcr_get_boot_mode(void)
+{
+	/* Get the bootmode register value */
+	return readl(&slcr_base->boot_mode);
+}
+
 u32 zynq_slcr_get_idcode(void)
 {
 	return (readl(&slcr_base->pss_idcode) & SLCR_IDCODE_MASK) >>

arch/arm/include/asm/arch-zynq/sys_proto.h

@@ -13,6 +13,7 @@ extern void zynq_slcr_cpu_reset(void);
 extern void zynq_slcr_gem_clk_setup(u32 gem_id, u32 rclk, u32 clk);
 extern void zynq_slcr_devcfg_disable(void);
 extern void zynq_slcr_devcfg_enable(void);
+extern u32 zynq_slcr_get_boot_mode(void);
 extern u32 zynq_slcr_get_idcode(void);
 extern void zynq_ddrc_init(void);
 

board/xilinx/zynq/board.c

@@ -12,6 +12,12 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+/* Bootmode setting values */
+#define ZYNQ_BM_MASK		0x0F
+#define ZYNQ_BM_NOR		0x02
+#define ZYNQ_BM_SD		0x05
+#define ZYNQ_BM_JTAG		0x0
+
 #ifdef CONFIG_FPGA
 Xilinx_desc fpga;
 
@@ -59,6 +65,25 @@ int board_init(void)
 	return 0;
 }
 
+int board_late_init(void)
+{
+	switch ((zynq_slcr_get_boot_mode()) & ZYNQ_BM_MASK) {
+	case ZYNQ_BM_NOR:
+		setenv("modeboot", "norboot");
+		break;
+	case ZYNQ_BM_SD:
+		setenv("modeboot", "sdboot");
+		break;
+	case ZYNQ_BM_JTAG:
+		setenv("modeboot", "jtagboot");
+		break;
+	default:
+		setenv("modeboot", "");
+		break;
+	}
+
+	return 0;
+}
 
 #ifdef CONFIG_CMD_NET
 int board_eth_init(bd_t *bis)

doc/README.zynq

@@ -28,7 +28,27 @@ and I/O programmability.
   - zc770-xm012 (nor)
   - zc770-xm013 (dual parallel qspi, gem1)
 
-3. Mainline status
+3. Bootmode
+
+Zynq has a facility to read the bootmode from the slcr bootmode register
+once user is setting through jumpers on the board - see page no:1546 on [5]
+
+All possible bootmode values are defined in Table 6-2:Boot_Mode MIO Pins
+on [5].
+
+board_late_init() will read the bootmode values using slcr bootmode register
+at runtime and assign the modeboot variable to specific bootmode string which
+is intern used in autoboot.
+
+SLCR bootmode register Bit[3:0] values
+#define ZYNQ_BM_NOR		0x02
+#define ZYNQ_BM_SD		0x05
+#define ZYNQ_BM_JTAG		0x0
+
+"modeboot" variable can assign any of "norboot", "sdboot" or "jtagboot"
+bootmode strings at runtime.
+
+4. Mainline status
 
 - Added basic board configurations support.
 - Added zynq u-boot bsp code - arch/arm/cpu/armv7/zynq
@@ -41,7 +61,7 @@ and I/O programmability.
   spi-  drivers/spi/zynq_spi.c
   i2c - drivers/i2c/zynq_i2c.c
 
-4. TODO
+5. TODO
 
 - Add zynq boards support - zc70x, zed, microzed, zc770
 - Add zynq qspi controller driver
@@ -54,6 +74,7 @@ and I/O programmability.
 [2] http://www.xilinx.com/products/boards-and-kits/EK-Z7-ZC706-G.htm
 [3] http://zedboard.org/product/zedboard
 [4] http://zedboard.org/product/microzed
+[5] http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf
 
 --
 Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

include/configs/zynq-common.h

@@ -140,6 +140,7 @@
 
 #define CONFIG_CMDLINE_EDITING
 #define CONFIG_AUTO_COMPLETE
+#define CONFIG_BOARD_LATE_INIT
 #define CONFIG_SYS_LONGHELP
 #define CONFIG_SYS_MAXARGS		15 /* max number of command args */
 #define CONFIG_SYS_CBSIZE		256 /* Console I/O Buffer Size */