Initial revision

1 files changed, 563 insertions, 0 deletions

diff --git a/board/sixnet/sixnet.c b/board/sixnet/sixnet.c
new file mode 100644
index 0000000..c65e809
--- /dev/null
+++ b/board/sixnet/sixnet.c
@@ -0,0 +1,563 @@
+/*
+ * (C) Copyright 2001, 2002
+ * Dave Ellis, SIXNET, dge@sixnetio.com.
+ *  Based on code by:
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * and other contributors to U-Boot. See file CREDITS for list
+ * of people who contributed to this  project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <config.h>
+#include <mpc8xx.h>
+#include <net.h>	/* for eth_init() */
+#include <rtc.h>
+#include "sixnet.h"
+
+#define ORMASK(size) ((-size) & OR_AM_MSK)
+
+static long ram_size(ulong *, long);
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Check Board Identity:
+ * returns 0 if recognized, -1 if unknown
+ */
+
+int checkboard (void)
+{
+	puts ("Board: SIXNET SXNI855T\n");
+	return 0;
+}
+
+/* ------------------------------------------------------------------------- */
+
+#if (CONFIG_COMMANDS & CFG_CMD_PCMCIA)
+#error "SXNI855T has no PCMCIA port"
+#endif	/* CFG_CMD_PCMCIA */
+
+/* ------------------------------------------------------------------------- */
+
+#define _not_used_ 0xffffffff
+
+/* UPMB table for dual UART. */
+
+/* this table is for 50MHz operation, it should work at all lower speeds */
+const uint duart_table[] =
+{
+	/* single read. (offset 0 in upm RAM) */
+	0xfffffc04, 0x0ffffc04, 0x0ff3fc04, 0x0ff3fc04,
+	0x0ff3fc00, 0x0ff3fc04, 0xfffffc04, 0xfffffc05,
+
+	/* burst read. (offset 8 in upm RAM) */
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* single write. (offset 18 in upm RAM) */
+	0xfffffc04, 0x0ffffc04, 0x00fffc04, 0x00fffc04,
+	0x00fffc04, 0x00fffc00, 0xfffffc04, 0xfffffc05,
+
+	/* burst write. (offset 20 in upm RAM) */
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* refresh. (offset 30 in upm RAM) */
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* exception. (offset 3c in upm RAM) */
+	_not_used_, _not_used_, _not_used_, _not_used_,
+};
+
+/* Load FPGA very early in boot sequence, since it must be
+ * loaded before the 16C2550 serial channels can be used as
+ * console channels.
+ *
+ * Note: Much of the configuration is not complete. The
+ *       stack is in DPRAM since SDRAM has not been initialized,
+ *       so the stack must be kept small. Global variables
+ *       are still in FLASH, so they cannot be written.
+ *	 Only the FLASH, DPRAM, immap and FPGA can be addressed,
+ *       the other chip selects may not have been initialized.
+ *       The clocks have been initialized, so udelay() can be
+ *       used.
+ */
+#define FPGA_DONE	0x0080	/* PA8, input, high when FPGA load complete */
+#define FPGA_PROGRAM_L	0x0040	/* PA9, output, low to reset, high to start */
+#define FPGA_INIT_L	0x0020	/* PA10, input, low indicates not ready	*/
+#define fpga (*(volatile unsigned char *)(CFG_FPGA_PROG))	/* FPGA port */
+
+int board_postclk_init (void)
+{
+
+	/* the data to load to the XCSxxXL FPGA */
+	static const unsigned char fpgadata[] = {
+# include "fpgadata.c"
+	};
+
+	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+#define porta (immap->im_ioport.iop_padat)
+	const unsigned char* pdata;
+
+	/* /INITFPGA and DONEFPGA signals are inputs */
+	immap->im_ioport.iop_padir &= ~(FPGA_INIT_L | FPGA_DONE);
+
+	/* Force output pin to begin at 0, /PROGRAM asserted (0) resets FPGA */
+	porta &= ~FPGA_PROGRAM_L;
+
+	/* Set FPGA as an output */
+	immap->im_ioport.iop_padir |= FPGA_PROGRAM_L;
+
+	/* delay a little to make sure FPGA sees it, really
+	 * only need less than a microsecond.
+	 */
+	udelay(10);
+
+	/* unassert /PROGRAM */
+	porta |= FPGA_PROGRAM_L;
+
+	/* delay while FPGA does last erase, indicated by
+	 * /INITFPGA going high. This should happen within a
+	 * few milliseconds.
+	 */
+	/* ### FIXME - a timeout check would be good, maybe flash
+	 * the status LED to indicate the error?
+	 */
+	while ((porta & FPGA_INIT_L) == 0)
+		; /* waiting */
+
+	/* write program data to FPGA at the programming address
+	 * so extra /CS1 strobes at end of configuration don't actually
+         * write to any registers.
+	 */
+	fpga = 0xff;		/* first write is ignored	*/
+	fpga = 0xff;		/* fill byte			*/
+	fpga = 0xff;		/* fill byte			*/
+	fpga = 0x4f;		/* preamble code		*/
+	fpga = 0x80; fpga = 0xaf; fpga = 0x9b; /* length (ignored) */
+	fpga = 0x4b;		/* field check code */
+
+	pdata = fpgadata;
+	/* while no error write out each of the 28 byte frames */
+	while ((porta & (FPGA_INIT_L | FPGA_DONE)) == FPGA_INIT_L
+	       && pdata < fpgadata + sizeof(fpgadata)) {
+
+		fpga = 0x4f;	/* preamble code */
+
+		/* 21 bytes of data in a frame */
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++); fpga = *(pdata++);
+		fpga = *(pdata++);
+
+		fpga = 0x4b;	/* field check code		*/
+		fpga = 0xff;	/* extended write cycle		*/
+		fpga = 0x4b;	/* extended write cycle
+				 * (actually 0x4b from bitgen.exe)
+				 */
+		fpga = 0xff;	/* extended write cycle		*/
+		fpga = 0xff;	/* extended write cycle		*/
+		fpga = 0xff;	/* extended write cycle		*/
+	}
+
+	fpga = 0xff;		/* startup byte			*/
+	fpga = 0xff;		/* startup byte			*/
+	fpga = 0xff;		/* startup byte			*/
+	fpga = 0xff;		/* startup byte			*/
+
+#if 0 /* ### FIXME */
+	/* If didn't load all the data or FPGA_DONE is low the load failed.
+	 * Maybe someday stop here and flash the status LED? The console
+	 * is not configured, so can't print an error message. Can't write
+	 * global variables to set a flag (except gd?).
+	 * For now it must work.
+	 */
+#endif
+
+	/* Now that the FPGA is loaded, set up the Dual UART chip
+	 * selects. Must be done here since it may be used as the console.
+	 */
+	upmconfig(UPMB, (uint *)duart_table, sizeof(duart_table)/sizeof(uint));
+
+	memctl->memc_mbmr = DUART_MBMR;
+	memctl->memc_or5 = DUART_OR_VALUE;
+	memctl->memc_br5 = DUART_BR5_VALUE;
+	memctl->memc_or6 = DUART_OR_VALUE;
+	memctl->memc_br6 = DUART_BR6_VALUE;
+
+	return (0);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* base address for SRAM, assume 32-bit port,  valid */
+#define NVRAM_BR_VALUE   (CFG_SRAM_BASE | BR_PS_32 | BR_V)
+
+/*  up to 64MB - will be adjusted for actual size */
+#define NVRAM_OR_PRELIM  (ORMASK(CFG_SRAM_SIZE) \
+	| OR_CSNT_SAM | OR_ACS_DIV4 | OR_BI | OR_SCY_5_CLK | OR_EHTR)
+/*
+ * Miscellaneous platform dependent initializations after running in RAM.
+ */
+
+int misc_init_r (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	bd_t *bd = gd->bd;
+
+	memctl->memc_or2 = NVRAM_OR_PRELIM;
+	memctl->memc_br2 = NVRAM_BR_VALUE;
+
+	/* Is there any SRAM? Is it 16 or 32 bits wide? */
+
+	/* First look for 32-bit SRAM */
+	bd->bi_sramsize = ram_size((ulong*)CFG_SRAM_BASE, CFG_SRAM_SIZE);
+
+	if (bd->bi_sramsize == 0) {
+	    /* no 32-bit SRAM, but there could be 16-bit SRAM since
+	     * it would report size 0 when configured for 32-bit bus.
+	     * Try again with a 16-bit bus.
+	     */
+	    memctl->memc_br2 |= BR_PS_16;
+	    bd->bi_sramsize = ram_size((ulong*)CFG_SRAM_BASE, CFG_SRAM_SIZE);
+	}
+
+	if (bd->bi_sramsize == 0) {
+	    memctl->memc_br2 = 0;	/* disable select since nothing there */
+	}
+	else {
+	    /* adjust or2 for actual size of SRAM */
+	    memctl->memc_or2 |= ORMASK(bd->bi_sramsize);
+	    bd->bi_sramstart = CFG_SRAM_BASE;
+	    printf("SRAM:  %lu KB\n", bd->bi_sramsize >> 10);
+	}
+
+
+	/* set standard MPC8xx clock so kernel will see the time
+	 * even if it doesn't have a DS1306 clock driver.
+	 * This helps with experimenting with standard kernels.
+	 */
+	{
+	    ulong tim;
+	    struct rtc_time tmp;
+
+	    rtc_get(&tmp);	/* get time from DS1306 RTC */
+
+	    /* convert to seconds since 1970 */
+	    tim = mktime(tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
+			 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
+
+	    immap->im_sitk.sitk_rtck = KAPWR_KEY;
+	    immap->im_sit.sit_rtc = tim;
+	}
+
+#if 0
+	/* The code below is no longer valid since the prototype of
+	 * eth_init() and eth_halt() have been changed to support
+	 * multi-ethernet feature in U-Boot; the eth_initialize()
+	 * routine should be called before any access to the ethernet
+	 * callbacks.
+	 */
+
+	/* FIXME - for now init ethernet to force PHY special mode */
+	eth_init(bd);
+	eth_halt();
+#endif
+	return (0);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Check memory range for valid RAM. A simple memory test determines
+ * the actually available RAM size between addresses `base' and
+ * `base + maxsize'.
+ *
+ * The memory size MUST be a power of 2 for this to work.
+ *
+ * The only memory modified is 4 bytes at offset 0. This is important
+ * since for the SRAM this location is reserved for autosizing, so if
+ * it is modified and the board is reset before ram_size() completes
+ * no damage is  done. Normally even the memory at 0 is preserved. The
+ * higher SRAM addresses may contain battery backed RAM disk data which
+ * must never be corrupted.
+ */
+
+static long ram_size(ulong *base, long maxsize)
+{
+    volatile long	*test_addr;
+    volatile long	*base_addr = base;
+    volatile long	*flash = (volatile long*)CFG_FLASH_BASE;
+    ulong		ofs;		/* byte offset from base_addr */
+    ulong		save;		/* to make test non-destructive */
+    ulong		junk;
+    long		ramsize = -1;	/* size not determined yet */
+
+    save = *base_addr;		/* save value at 0 so can restore */
+
+    /* is any SRAM present? */
+    *base_addr = 0x5555aaaa;
+
+    /* use flash read to modify data bus, since with no SRAM present
+     * the data bus may retain the value if our code is running
+     * completely in the cache.
+     */
+    junk = *flash;
+
+    if (*base_addr != 0x5555aaaa)
+	ramsize = 0;		/* no RAM present, or defective */
+    else {
+	*base_addr = 0xaaaa5555;
+	junk = *flash;		/* use flash read to modify data bus */
+	if (*base_addr != 0xaaaa5555)
+	    ramsize = 0;	/* no RAM present, or defective */
+    }
+
+    /* now size it if any is present */
+    for (ofs = 4; ofs < maxsize && ramsize < 0; ofs <<= 1) {
+	test_addr = (long*)((long)base_addr + ofs);	/* location to test */
+
+	*base_addr = ~*test_addr;
+	if (*base_addr == *test_addr)
+	    ramsize = ofs;	/* wrapped back to 0, so this is the size */
+    }
+
+    *base_addr = save;		/* restore value at 0 */
+    return (ramsize);
+}
+
+/* ------------------------------------------------------------------------- */
+/* sdram table based on the FADS manual                                      */
+/* for chip MB811171622A-100                                                 */
+
+/* this table is for 50MHz operation, it should work at all lower speeds */
+
+const uint sdram_table[] =
+{
+	/* single read. (offset 0 in upm RAM) */
+	0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00,
+	0x1ff77c47,
+
+	/* precharge and Mode Register Set initialization (offset 5).
+	 * This is also entered at offset 6 to do Mode Register Set
+	 * without the precharge.
+	 */
+	0x1ff77c34, 0xefeabc34, 0x1fb57c35,
+
+	/* burst read. (offset 8 in upm RAM) */
+	0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00,
+	0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* single write. (offset 18 in upm RAM) */
+        /* FADS had 0x1f27fc04, ...
+	 * but most other boards have 0x1f07fc04, which
+	 * sets GPL0 from A11MPC to 0 1/4 clock earlier,
+	 * like the single read.
+	 * This seems better so I am going with the change.
+	 */
+	0x1f07fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* burst write. (offset 20 in upm RAM) */
+	0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
+	0xf0affc00, 0xe1bbbc04, 0x1ff77c47, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* refresh. (offset 30 in upm RAM) */
+	0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
+	0xfffffc84, 0xfffffc07, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* exception. (offset 3c in upm RAM) */
+	0x7ffffc07, _not_used_, _not_used_, _not_used_ };
+
+/* ------------------------------------------------------------------------- */
+
+#define	SDRAM_MAX_SIZE		0x10000000	/* max 256 MB SDRAM */
+
+/* precharge and set Mode Register */
+#define SDRAM_MCR_PRE    (MCR_OP_RUN | MCR_UPM_A |	/* select UPM     */ \
+			  MCR_MB_CS3 |			/* chip select    */ \
+			  MCR_MLCF(1) | MCR_MAD(5))	/* 1 time at 0x05 */
+
+/* set Mode Register, no precharge */
+#define SDRAM_MCR_MRS    (MCR_OP_RUN | MCR_UPM_A |	/* select UPM     */ \
+			  MCR_MB_CS3 |			/* chip select    */ \
+			  MCR_MLCF(1) | MCR_MAD(6))	/* 1 time at 0x06 */
+
+/* runs refresh loop twice so get 8 refresh cycles */
+#define SDRAM_MCR_REFR   (MCR_OP_RUN | MCR_UPM_A |	/* select UPM     */ \
+			  MCR_MB_CS3 |			/* chip select    */ \
+			  MCR_MLCF(2) | MCR_MAD(0x30))	/* twice at 0x30  */
+
+/* MAMR values work in either mamr or mbmr */
+/* 8 column SDRAM */
+#define SDRAM_MAMR_8COL  /* refresh at 50MHz */				  \
+			 ((195 << MAMR_PTA_SHIFT) | MAMR_PTAE		  \
+			 | MAMR_AMA_TYPE_0	/* Address MUX 0 */	  \
+			 | MAMR_DSA_1_CYCL	/* 1 cycle disable */	  \
+			 | MAMR_G0CLA_A11	/* GPL0 A11[MPC] */	  \
+			 | MAMR_RLFA_1X		/* Read loop 1 time */	  \
+			 | MAMR_WLFA_1X		/* Write loop 1 time */	  \
+			 | MAMR_TLFA_4X)	/* Timer loop 4 times */
+
+/* 9 column SDRAM */
+#define SDRAM_MAMR_9COL ((SDRAM_MAMR_8COL & (~MAMR_G0CLA_A11)) | MAMR_G0CLA_A10)
+
+/* base address 0, 32-bit port, SDRAM UPM, valid */
+#define SDRAM_BR_VALUE   (BR_PS_32 | BR_MS_UPMA | BR_V)
+
+/*  up to 256MB, SAM, G5LS - will be adjusted for actual size */
+#define SDRAM_OR_PRELIM  (ORMASK(SDRAM_MAX_SIZE) | OR_CSNT_SAM | OR_G5LS)
+
+/* This is the Mode Select Register value for the SDRAM.
+ * Burst length: 4
+ * Burst Type: sequential
+ * CAS Latency: 2
+ * Write Burst Length: burst
+ */
+#define SDRAM_MODE   0x22	/* CAS latency 2, burst length 4 */
+
+/* ------------------------------------------------------------------------- */
+
+long int initdram(int board_type)
+{
+	volatile immap_t     *immap = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	uint size_sdram = 0;
+	uint size_sdram9 = 0;
+	uint base = 0;		/* SDRAM must start at 0 */
+	int i;
+
+	upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
+
+	/* Configure the refresh (mostly).  This needs to be
+	 * based upon processor clock speed and optimized to provide
+	 * the highest level of performance.
+	 *
+	 * Preliminary prescaler for refresh.
+	 * This value is selected for four cycles in 31.2 us,
+	 * which gives 8192 cycles in 64 milliseconds.
+	 * This may be too fast, but works for any memory.
+	 * It is adjusted to 4096 cycles in 64 milliseconds if
+	 * possible once we know what memory we have.
+         *
+	 * We have to be careful changing UPM registers after we
+	 * ask it to run these commands.
+	 *
+	 * PTA - periodic timer period for our design is
+	 *       50 MHz x 31.2us
+	 *       ---------------  = 195
+	 *       1 x 8 x 1
+	 *
+	 *    50MHz clock
+	 *    31.2us refresh interval
+	 *    SCCR[DFBRG] 0
+	 *    PTP divide by 8
+	 *    1 chip select
+         */
+	memctl->memc_mptpr = MPTPR_PTP_DIV8;	/* 0x0800 */
+	memctl->memc_mamr = SDRAM_MAMR_8COL & (~MAMR_PTAE); /* no refresh yet */
+
+	/* The SDRAM Mode Register value is shifted left 2 bits since
+	 * A30 and A31 don't connect to the SDRAM for 32-bit wide memory.
+	 */
+	memctl->memc_mar = SDRAM_MODE << 2;	/* MRS code */
+	udelay(200);		/* SDRAM needs 200uS before set it up */
+
+	/* Now run the precharge/nop/mrs commands. */
+	memctl->memc_mcr = SDRAM_MCR_PRE;
+	udelay(2);
+
+	/* Run 8 refresh cycles (2 sets of 4) */
+	memctl->memc_mcr = SDRAM_MCR_REFR;	/* run refresh twice */
+	udelay(2);
+
+	/* some brands want Mode Register set after the refresh
+	 * cycles. This shouldn't hurt anything for the brands
+	 * that were happy with the first time we set it.
+	 */
+	memctl->memc_mcr = SDRAM_MCR_MRS;
+	udelay(2);
+
+	memctl->memc_mamr = SDRAM_MAMR_8COL;	/* enable refresh */
+	memctl->memc_or3 = SDRAM_OR_PRELIM;
+	memctl->memc_br3 = SDRAM_BR_VALUE + base;
+
+	/* Some brands need at least 10 DRAM accesses to stabilize.
+	 * It wont hurt the brands that don't.
+	 */
+	for (i=0; i<10; ++i) {
+		volatile ulong *addr = (volatile ulong *)base;
+		ulong val;
+
+		val = *(addr + i);
+		*(addr + i) = val;
+	}
+
+	/* Check SDRAM memory Size in 8 column mode.
+	 * For a 9 column memory we will get half the actual size.
+	 */
+	size_sdram = ram_size((ulong *)0, SDRAM_MAX_SIZE);
+
+	/* Check SDRAM memory Size in 9 column mode.
+	 * For an 8 column memory we will see at most 4 megabytes.
+	 */
+	memctl->memc_mamr = SDRAM_MAMR_9COL;
+	size_sdram9 = ram_size((ulong *)0, SDRAM_MAX_SIZE);
+
+	if (size_sdram < size_sdram9)	/* leave configuration at 9 columns */
+		size_sdram = size_sdram9;
+	else				/* go back to 8 columns */
+		memctl->memc_mamr = SDRAM_MAMR_8COL;
+
+	/* adjust or3 for actual size of SDRAM
+	 */
+	memctl->memc_or3 |= ORMASK(size_sdram);
+
+	/* Adjust refresh rate depending on SDRAM type.
+	 * For types > 128 MBit (32 Mbyte for 2 x16 devices) leave
+	 * it at the current (fast) rate.
+	 * For 16, 64 and 128 MBit half the rate will do.
+	 */
+	if (size_sdram <= 32 * 1024 * 1024)
+		memctl->memc_mptpr = MPTPR_PTP_DIV16;	/* 0x0400 */
+
+	return (size_sdram);
+}
+