ppc4xx: Add lcd4_lwmon5 support

This patch adds the fast booting LWMON5 derivat "lcd4_lwmon5".
Its a stripped down version of the full blown lwmon5 support,
without ECC, USB, POST and some other stuff. It used the newly
introduced SPL infrastrucure for SPL from NOR flash booting
on the PPC4xx.

By setting the environment variable "boot_os" to "yes", Linux
will be started from the SPL version. If not, the "normal"
U-Boot will be started.

Signed-off-by: Stefan Roese <sr@denx.de>

2 files changed, 76 insertions, 3 deletions

diff --git a/board/lwmon5/lwmon5.c b/board/lwmon5/lwmon5.c
index 29e24fb26fe..9cf0fa167c8 100644
--- a/board/lwmon5/lwmon5.c
+++ b/board/lwmon5/lwmon5.c
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2007-2010
+ * (C) Copyright 2007-2013
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
  * This program is free software; you can redistribute it and/or
@@ -200,9 +200,11 @@ int misc_init_r(void)
 	u32 pbcr;
 	int size_val = 0;
 	u32 reg;
+#ifndef CONFIG_LCD4_LWMON5
 	unsigned long usb2d0cr = 0;
 	unsigned long usb2phy0cr, usb2h0cr = 0;
 	unsigned long sdr0_pfc1, sdr0_srst;
+#endif
 
 	/*
 	 * FLASH stuff...
@@ -233,6 +235,7 @@ int misc_init_r(void)
 		      CONFIG_ENV_ADDR_REDUND + 2 * CONFIG_ENV_SECT_SIZE - 1,
 		      &flash_info[cfi_flash_num_flash_banks - 1]);
 
+#ifndef CONFIG_LCD4_LWMON5
 	/*
 	 * USB suff...
 	 */
@@ -306,6 +309,7 @@ int misc_init_r(void)
 	/* 7. Reassert internal PHY reset: */
 	mtsdr(SDR0_SRST1, SDR0_SRST1_USB20PHY);
 	udelay(1000);
+#endif
 
 	/*
 	 * Clear resets
@@ -313,7 +317,9 @@ int misc_init_r(void)
 	mtsdr(SDR0_SRST1, 0x00000000);
 	mtsdr(SDR0_SRST0, 0x00000000);
 
+#ifndef CONFIG_LCD4_LWMON5
 	printf("USB:   Host(int phy) Device(ext phy)\n");
+#endif
 
 	/*
 	 * Clear PLB4A0_ACR[WRP]
@@ -323,10 +329,12 @@ int misc_init_r(void)
 	reg = mfdcr(PLB4A0_ACR) & ~PLB4Ax_ACR_WRP_MASK;
 	mtdcr(PLB4A0_ACR, reg);
 
+#ifndef CONFIG_LCD4_LWMON5
 	/*
 	 * Init matrix keyboard
 	 */
 	misc_init_r_kbd();
+#endif
 
 	return 0;
 }
@@ -336,7 +344,7 @@ int checkboard(void)
 	char buf[64];
 	int i = getenv_f("serial#", buf, sizeof(buf));
 
-	puts("Board: lwmon5");
+	printf("Board: %s", __stringify(CONFIG_HOSTNAME));
 
 	if (i > 0) {
 		puts(", serial# ");
@@ -495,3 +503,66 @@ void board_reset(void)
 {
 	gpio_write_bit(CONFIG_SYS_GPIO_BOARD_RESET, 1);
 }
+
+#ifdef CONFIG_SPL_OS_BOOT
+/*
+ * lwmon5 specific implementation of spl_start_uboot()
+ *
+ * RETURN
+ * 0 if booting into OS is selected (default)
+ * 1 if booting into U-Boot is selected
+ */
+int spl_start_uboot(void)
+{
+	char s[8];
+
+	env_init();
+	getenv_f("boot_os", s, sizeof(s));
+	if ((s != NULL) && (strcmp(s, "yes") == 0))
+		return 0;
+
+	return 1;
+}
+
+/*
+ * This function is called from the SPL U-Boot version for
+ * early init stuff, that needs to be done for OS (e.g. Linux)
+ * booting. Doing it later in the real U-Boot would not work
+ * in case that the SPL U-Boot boots Linux directly.
+ */
+void spl_board_init(void)
+{
+	const gdc_regs *regs = board_get_regs();
+
+	/*
+	 * Setup PFC registers, mainly for ethernet support
+	 * later on in Linux
+	 */
+	board_early_init_f();
+
+	/*
+	 * Clear resets
+	 */
+	mtsdr(SDR0_SRST1, 0x00000000);
+	mtsdr(SDR0_SRST0, 0x00000000);
+
+	/*
+	 * Reset Lime controller
+	 */
+	gpio_write_bit(CONFIG_SYS_GPIO_LIME_S, 1);
+	udelay(500);
+	gpio_write_bit(CONFIG_SYS_GPIO_LIME_RST, 1);
+
+	out_be32((void *)CONFIG_SYS_LIME_SDRAM_CLOCK, CONFIG_SYS_MB862xx_CCF);
+	udelay(300);
+	out_be32((void *)CONFIG_SYS_LIME_MMR, CONFIG_SYS_MB862xx_MMR);
+
+	while (regs->index) {
+		out_be32((void *)(CONFIG_SYS_LIME_BASE_0 + GC_DISP_BASE) +
+			 regs->index, regs->value);
+		regs++;
+	}
+
+	board_backlight_brightness(DEFAULT_BRIGHTNESS);
+}
+#endif
diff --git a/board/lwmon5/sdram.c b/board/lwmon5/sdram.c
index b64b35a94ea..78b8fbc8417 100644
--- a/board/lwmon5/sdram.c
+++ b/board/lwmon5/sdram.c
@@ -6,7 +6,7 @@
  * Alain Saurel,	    AMCC/IBM, alain.saurel@fr.ibm.com
  * Robert Snyder,	    AMCC/IBM, rob.snyder@fr.ibm.com
  *
- * (C) Copyright 2007-2008
+ * (C) Copyright 2007-2013
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
  * This program is free software; you can redistribute it and/or
@@ -160,6 +160,7 @@ static void program_ecc(u32 start_address,
  ************************************************************************/
 phys_size_t initdram (int board_type)
 {
+#if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_LCD4_LWMON5)
 	/* CL=4 */
 	mtsdram(DDR0_02, 0x00000000);
 
@@ -253,6 +254,7 @@ phys_size_t initdram (int board_type)
 	 * exceptions are enabled.
 	 */
 	set_mcsr(get_mcsr());
+#endif /* CONFIG_SPL_BUILD */
 
 	return (CONFIG_SYS_MBYTES_SDRAM << 20);
 }