pxa: add support for palmtreo680 board

This patch adds support for the Palm Treo 680 smartphone.  A quick overview of
u-boot implementation on the treo 680...

The treo 680 has a Diskonchip G4 nand flash chip.  This device has a 2k region
that maps to the system bus at the reset vector in a NOR-like fashion so that it
can be used as the boot device.  The phone is shipped with this 2k region
configured as write-protected (can't be modified) and programmed with an initial
program loader (IPL).  At power-up, this IPL loads the contents of two flash
blocks to SDRAM and jumps to it.  The capacity of the two blocks is not large
enough to hold all of u-boot, so a u-boot SPL is used.  To conserve flash space,
these two blocks and the necessary number of subsequent blocks are programmed
with a concatenated spl + u-boot image.  That way, the IPL will also load a
portion of u-boot proper, and when the spl runs, it relocates the portion of
u-boot that the IPL has already loaded, and then resumes loading the remaining
part of u-boot before jumping to it.

The default_environment is used (CONFIG_ENV_IS_NOWHERE) because I didn't think
that having a writable environment was worth the cost of a flash block, although
adding it would be straightforward.  I abuse the CONFIG_EXTRA_ENV_SETTINGS
option to specify the usbtty for the console (CONFIG_SYS_CONSOLE_IS_IN_ENV).

Support for the LCD is included, but currently it is only useful for displaying
the u-boot splash screen.  But if u-boot is built without the usbtty console, it
does display the auto-boot progress nicely.

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/board/palmtreo680/palmtreo680.c b/board/palmtreo680/palmtreo680.c
new file mode 100644
index 0000000000..f4f6e1f5b9
--- /dev/null
+++ b/board/palmtreo680/palmtreo680.c
@@ -0,0 +1,148 @@
+/*
+ * Palm Treo 680 Support
+ *
+ * Copyright (C) 2013 Mike Dunn <mikedunn@newsguy.com>
+ *
+ * This file is released under the terms of GPL v2 and any later version.
+ * See the file COPYING in the root directory of the source tree for details.
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <serial.h>
+#include <nand.h>
+#include <malloc.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch-pxa/pxa.h>
+#include <asm/arch-pxa/regs-mmc.h>
+#include <asm/io.h>
+#include <asm/global_data.h>
+#include <u-boot/crc.h>
+#include <linux/mtd/docg4.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct nand_chip docg4_nand_chip;
+
+int board_init(void)
+{
+	/* We have RAM, disable cache */
+	dcache_disable();
+	icache_disable();
+
+	gd->bd->bi_arch_number = CONFIG_MACH_TYPE;
+	gd->bd->bi_boot_params = CONFIG_SYS_DRAM_BASE + 0x100;
+
+	return 0;
+}
+
+int dram_init(void)
+{
+	/* IPL initializes SDRAM (we're already running from it) */
+	gd->ram_size = PHYS_SDRAM_1_SIZE;
+	return 0;
+}
+
+#ifdef CONFIG_LCD
+void lcd_enable(void)
+{
+	/*
+	 * Undo the L_BIAS / gpio77 pin configuration performed by the pxa lcd
+	 * driver code.  We need it as an output gpio.
+	 */
+	writel((readl(GAFR2_L) & ~(0xc << 24)), GAFR2_L);
+
+	/* power-up and enable the lcd */
+	writel(0x00400000, GPSR(86)); /* enable; drive high */
+	writel(0x00002000, GPSR(77)); /* power; drive high */
+	writel(0x02000000, GPCR(25)); /* enable_n; drive low */
+
+	/* turn on LCD backlight and configure PWM for reasonable brightness */
+	writel(0x00, PWM_CTRL0);
+	writel(0x1b1, PWM_PERVAL0);
+	writel(0xfd, PWM_PWDUTY0);
+	writel(0x00000040, GPSR(38)); /*  backlight power on */
+}
+#endif
+
+#ifdef CONFIG_MMC
+int board_mmc_init(bd_t *bis)
+{
+	writel(1 << 10, GPSR(42)); /* power on */
+	return pxa_mmc_register(0);
+}
+#endif
+
+void board_nand_init(void)
+{
+	/* we have one 128M diskonchip G4  */
+
+	struct mtd_info *mtd = &nand_info[0];
+	struct nand_chip *nand = &docg4_nand_chip;
+	if (docg4_nand_init(mtd, nand, 0))
+		hang();
+}
+
+#ifdef CONFIG_SPL_BUILD
+void nand_boot(void)
+{
+	__attribute__((noreturn)) void (*uboot)(void);
+
+	extern const void *_start, *_end;   /* boundaries of spl in memory */
+
+	/* size of spl; ipl loads this, and then a portion of u-boot */
+	const size_t spl_image_size = ((size_t)&_end - (size_t)&_start);
+
+	/* the flash offset of the blocks that are loaded by the spl */
+	const uint32_t spl_load_offset = CONFIG_SYS_NAND_U_BOOT_OFFS +
+		DOCG4_IPL_LOAD_BLOCK_COUNT * DOCG4_BLOCK_SIZE;
+
+	/* total number of bytes loaded by IPL */
+	const size_t ipl_load_size =
+		DOCG4_IPL_LOAD_BLOCK_COUNT * DOCG4_BLOCK_CAPACITY_SPL;
+
+	/* number of bytes of u-boot proper that was loaded by the IPL */
+	const size_t ipl_uboot_load_size = ipl_load_size - spl_image_size;
+
+	/* number of remaining bytes of u-boot that the SPL must load */
+	const size_t spl_load_size =
+		CONFIG_SYS_NAND_U_BOOT_SIZE - ipl_load_size;
+
+	/* memory address where we resume loading u-boot */
+	void *const load_addr =
+		(void *)(CONFIG_SYS_NAND_U_BOOT_DST + ipl_uboot_load_size);
+
+	/*
+	 * Copy the portion of u-boot already read from flash by the IPL to its
+	 * correct load address.
+	 */
+	memcpy((void *)CONFIG_SYS_NAND_U_BOOT_DST, &_end, ipl_uboot_load_size);
+
+	/*
+	 * Resume loading u-boot where the IPL left off.
+	 */
+	nand_spl_load_image(spl_load_offset, spl_load_size, load_addr);
+
+#ifdef CONFIG_NAND_ENV_DST
+	nand_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
+			    (void *)CONFIG_NAND_ENV_DST);
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
+			    (void *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
+#endif
+#endif
+	/*
+	 * Jump to U-Boot image
+	 */
+	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
+	(*uboot)();
+}
+
+void board_init_f(ulong bootflag)
+{
+	nand_boot();
+}
+
+#endif  /* CONFIG_SPL_BUILD */