1 files changed, 413 insertions, 0 deletions
diff --git a/cpu/mpc83xx/spd_sdram.c b/cpu/mpc83xx/spd_sdram.c
new file mode 100644
index 000000000..5bd112ce6
--- /dev/null
+++ b/cpu/mpc83xx/spd_sdram.c
@@ -0,0 +1,413 @@
+/*
+ * Copyright 2004 Freescale Semiconductor.
+ * (C) Copyright 2003 Motorola Inc.
+ * Xianghua Xiao (X.Xiao@motorola.com)
+ *
+ * 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
+ *
+ * Change log:
+ *
+ * 20050101: Eran Liberty (liberty@freescale.com)
+ *           Initial file creating (porting from 85XX & 8260)
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <i2c.h>
+#include <spd.h>
+#include <asm/mmu.h>
+#include <spd_sdram.h>
+
+#ifdef CONFIG_SPD_EEPROM
+
+
+#if defined(CONFIG_DDR_ECC)
+extern void dma_init(void);
+extern uint dma_check(void);
+extern int dma_xfer(void *dest, uint count, void *src);
+#endif
+
+
+#ifndef	CFG_READ_SPD
+#define CFG_READ_SPD	i2c_read
+#endif
+
+
+
+/*
+ * Convert picoseconds into clock cycles (rounding up if needed).
+ */
+
+int
+picos_to_clk(int picos)
+{
+	int clks;
+
+	clks = picos / (2000000000 / (get_bus_freq(0) / 1000));
+	if (picos % (2000000000 / (get_bus_freq(0) / 1000)) != 0) {
+	clks++;
+	}
+
+	return clks;
+}
+
+
+unsigned int
+banksize(unsigned char row_dens)
+{
+	return ((row_dens >> 2) | ((row_dens & 3) << 6)) << 24;
+}
+
+
+long int spd_sdram(int(read_spd)(uint addr))
+{
+	volatile immap_t *immap = (immap_t *)CFG_IMMRBAR;
+	volatile ddr8349_t *ddr = &immap->ddr;
+	volatile law8349_t *ecm = &immap->sysconf.ddrlaw[0];
+	spd_eeprom_t spd;
+	unsigned tmp, tmp1;
+	unsigned int memsize;
+	unsigned int law_size;
+	unsigned char caslat;
+	unsigned int trfc, trfc_clk, trfc_low;
+	
+#warning Current spd_sdram does not fit its usage... adjust implementation or API...	
+
+	CFG_READ_SPD(SPD_EEPROM_ADDRESS, 0, 1, (uchar *) & spd, sizeof (spd));
+
+	if (spd.nrows > 2) {
+		puts("DDR:Only two chip selects are supported on ADS.\n");
+		return 0;
+	}
+
+	if (spd.nrow_addr < 12
+	    || spd.nrow_addr > 14
+	    || spd.ncol_addr < 8
+	    || spd.ncol_addr > 11) {
+		puts("DDR:Row or Col number unsupported.\n");
+		return 0;
+	}
+
+	ddr->csbnds[2].csbnds = (banksize(spd.row_dens) >> 24) - 1;
+	ddr->cs_config[2] = ( 1 << 31
+			    | (spd.nrow_addr - 12) << 8
+			    | (spd.ncol_addr - 8) );
+	debug("\n");
+	debug("cs2_bnds = 0x%08x\n",ddr->csbnds[2].csbnds);
+	debug("cs2_config = 0x%08x\n",ddr->cs_config[2]);
+	
+	if (spd.nrows == 2) {
+		ddr->csbnds[3].csbnds = ( (banksize(spd.row_dens) >> 8)
+				  | ((banksize(spd.row_dens) >> 23) - 1) );
+		ddr->cs_config[3] = ( 1<<31
+				    | (spd.nrow_addr-12) << 8
+				    | (spd.ncol_addr-8) );
+		debug("cs3_bnds = 0x%08x\n",ddr->csbnds[3].csbnds);
+		debug("cs3_config = 0x%08x\n",ddr->cs_config[3]);
+	}
+
+	if (spd.mem_type != 0x07) {
+		puts("No DDR module found!\n");
+		return 0;
+	}
+
+	/*
+	 * Figure out memory size in Megabytes.
+	 */
+	memsize = spd.nrows * banksize(spd.row_dens) / 0x100000;
+
+	/*
+	 * First supported LAW size is 16M, at LAWAR_SIZE_16M == 23.
+	 */
+	law_size = 19 + __ilog2(memsize);
+
+	/*
+	 * Set up LAWBAR for all of DDR.
+	 */
+	ecm->bar = ((CFG_DDR_SDRAM_BASE>>12) & 0xfffff);
+	ecm->ar  = (LAWAR_EN | LAWAR_TRGT_IF_DDR | (LAWAR_SIZE & law_size));
+	debug("DDR:bar=0x%08x\n", ecm->bar);
+	debug("DDR:ar=0x%08x\n", ecm->ar);
+
+	/*
+	 * find the largest CAS
+	 */
+	if(spd.cas_lat & 0x40) {
+		caslat = 7;
+	} else if (spd.cas_lat & 0x20) {
+		caslat = 6;
+	} else if (spd.cas_lat & 0x10) {
+		caslat = 5;
+	} else if (spd.cas_lat & 0x08) {
+		caslat = 4;
+	} else if (spd.cas_lat & 0x04) {
+		caslat = 3;
+	} else if (spd.cas_lat & 0x02) {
+		caslat = 2;
+	} else if (spd.cas_lat & 0x01) {
+		caslat = 1;
+	} else {
+		puts("DDR:no valid CAS Latency information.\n");
+		return 0;
+	}
+
+	tmp = 20000 / (((spd.clk_cycle & 0xF0) >> 4) * 10
+		       + (spd.clk_cycle & 0x0f));
+	debug("DDR:Module maximum data rate is: %dMhz\n", tmp);
+
+	tmp1 = get_bus_freq(0) / 1000000;
+	if (tmp1 < 230 && tmp1 >= 90 && tmp >= 230) {
+		/* 90~230 range, treated as DDR 200 */
+		if (spd.clk_cycle3 == 0xa0)
+			caslat -= 2;
+		else if(spd.clk_cycle2 == 0xa0)
+			caslat--;
+	} else if (tmp1 < 280 && tmp1 >= 230 && tmp >= 280) {
+		/* 230-280 range, treated as DDR 266 */
+		if (spd.clk_cycle3 == 0x75)
+			caslat -= 2;
+		else if (spd.clk_cycle2 == 0x75)
+			caslat--;
+	} else if (tmp1 < 350 && tmp1 >= 280 && tmp >= 350) {
+		/* 280~350 range, treated as DDR 333 */
+		if (spd.clk_cycle3 == 0x60)
+			caslat -= 2;
+		else if (spd.clk_cycle2 == 0x60)
+			caslat--;
+	} else if (tmp1 < 90 || tmp1 >= 350) {
+		/* DDR rate out-of-range */
+		puts("DDR:platform frequency is not fit for DDR rate\n");
+		return 0;
+	}
+
+	/*
+	 * note: caslat must also be programmed into ddr->sdram_mode
+	 * register.
+	 *
+	 * note: WRREC(Twr) and WRTORD(Twtr) are not in SPD,
+	 * use conservative value here.
+	 */
+	trfc = spd.trfc * 1000;         /* up to ps */
+	trfc_clk = picos_to_clk(trfc);
+	trfc_low = (trfc_clk - 8) & 0xf;
+
+	ddr->timing_cfg_1 =
+	    (((picos_to_clk(spd.trp * 250) & 0x07) << 28 ) |
+	     ((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24 ) |
+	     ((picos_to_clk(spd.trcd * 250) & 0x07) << 20 ) |
+	     ((caslat & 0x07) << 16 ) |
+	     (trfc_low << 12 ) |
+	     ( 0x300 ) |
+	     ((picos_to_clk(spd.trrd * 250) & 0x07) << 4) | 1);
+
+	ddr->timing_cfg_2 = 0x00000800;
+
+	debug("DDR:timing_cfg_1=0x%08x\n", ddr->timing_cfg_1);
+	debug("DDR:timing_cfg_2=0x%08x\n", ddr->timing_cfg_2);
+
+	/*
+	 * Only DDR I is supported
+	 * DDR I and II have different mode-register-set definition
+	 */
+
+	/* burst length is always 4 */
+	switch(caslat) {
+	case 2:
+		ddr->sdram_mode = 0x52; /* 1.5 */
+		break;
+	case 3:
+		ddr->sdram_mode = 0x22; /* 2.0 */
+		break;
+	case 4:
+		ddr->sdram_mode = 0x62; /* 2.5 */
+		break;
+	case 5:
+		ddr->sdram_mode = 0x32; /* 3.0 */
+		break;
+	default:
+		puts("DDR:only CAS Latency 1.5, 2.0, 2.5, 3.0 is supported.\n");
+		return 0;
+	}
+	debug("DDR:sdram_mode=0x%08x\n", ddr->sdram_mode);
+
+	switch(spd.refresh) {
+	case 0x00:
+	case 0x80:
+		tmp = picos_to_clk(15625000);
+		break;
+	case 0x01:
+	case 0x81:
+		tmp = picos_to_clk(3900000);
+		break;
+	case 0x02:
+	case 0x82:
+		tmp = picos_to_clk(7800000);
+		break;
+	case 0x03:
+	case 0x83:
+		tmp = picos_to_clk(31300000);
+		break;
+	case 0x04:
+	case 0x84:
+		tmp = picos_to_clk(62500000);
+		break;
+	case 0x05:
+	case 0x85:
+		tmp = picos_to_clk(125000000);
+		break;
+	default:
+		tmp = 0x512;
+		break;
+	}
+
+	/*
+	 * Set BSTOPRE to 0x100 for page mode
+	 * If auto-charge is used, set BSTOPRE = 0
+	 */
+	ddr->sdram_interval = ((tmp & 0x3fff) << 16) | 0x100;
+	debug("DDR:sdram_interval=0x%08x\n", ddr->sdram_interval);
+
+	/*
+	 * Is this an ECC DDR chip?
+	 */
+#if defined(CONFIG_DDR_ECC)
+	if (spd.config == 0x02) {
+		ddr->err_disable = 0x0000000d;
+		ddr->err_sbe = 0x00ff0000;
+	}
+	debug("DDR:err_disable=0x%08x\n", ddr->err_disable);
+	debug("DDR:err_sbe=0x%08x\n", ddr->err_sbe);
+#endif
+	asm("sync;isync");
+
+	udelay(500);
+
+
+	ddr->sdram_clk_cntl = 0x82000000;/*SS_EN=1, CLK_ADJST = 2-MCK/MCK_B, is lauched 1/2 of one SDRAM clock cycle after address/command*/
+
+
+	/*
+	 * Figure out the settings for the sdram_cfg register.  Build up
+	 * the entire register in 'tmp' before writing since the write into
+	 * the register will actually enable the memory controller, and all
+	 * settings must be done before enabling.
+	 *
+	 * sdram_cfg[0]   = 1 (ddr sdram logic enable)
+	 * sdram_cfg[1]   = 1 (self-refresh-enable)
+	 * sdram_cfg[6:7] = 2 (SDRAM type = DDR SDRAM)
+	 */
+	tmp = 0xc2000000;
+
+	/*
+	 * sdram_cfg[3] = RD_EN - registered DIMM enable
+	 *   A value of 0x26 indicates micron registered DIMMS (micron.com)
+	 */
+	if (spd.mod_attr == 0x26) {
+		tmp |= 0x10000000;
+	}
+
+#if defined(CONFIG_DDR_ECC)
+	/*
+	 * If the user wanted ECC (enabled via sdram_cfg[2])
+	 */
+	if (spd.config == 0x02) {
+		tmp |= 0x20000000;
+	}
+#endif
+
+#if defined(CONFIG_DDR_2T_TIMING)
+	/*
+	 * Enable 2T timing by setting sdram_cfg[16].
+	 */
+	tmp |= SDRAM_CFG_2T_EN;
+#endif
+
+	ddr->sdram_cfg = tmp;
+
+	asm("sync;isync");
+	udelay(500);
+
+	debug("DDR:sdram_cfg=0x%08x\n", ddr->sdram_cfg);
+
+	return memsize;/*in MBytes*/
+}
+
+#endif /* CONFIG_SPD_EEPROM */
+
+
+#if defined(CONFIG_DDR_ECC)
+/*
+ * Initialize all of memory for ECC, then enable errors.
+ */
+
+void
+ddr_enable_ecc(unsigned int dram_size)
+{
+#ifndef FIXME
+	uint *p = 0;
+	uint i = 0;
+	volatile immap_t *immap = (immap_t *)CFG_IMMRBAR;
+	volatile ccsr_ddr_t *ddr= &immap->im_ddr;
+
+	dma_init();
+
+	for (*p = 0; p < (uint *)(8 * 1024); p++) {
+		if (((unsigned int)p & 0x1f) == 0) {
+			ppcDcbz((unsigned long) p);
+		}
+		*p = (unsigned int)0xdeadbeef;
+		if (((unsigned int)p & 0x1c) == 0x1c) {
+			ppcDcbf((unsigned long) p);
+		}
+	}
+
+	/* 8K */
+	dma_xfer((uint *)0x2000, 0x2000, (uint *)0);
+	/* 16K */
+	dma_xfer((uint *)0x4000, 0x4000, (uint *)0);
+	/* 32K */
+	dma_xfer((uint *)0x8000, 0x8000, (uint *)0);
+	/* 64K */
+	dma_xfer((uint *)0x10000, 0x10000, (uint *)0);
+	/* 128k */
+	dma_xfer((uint *)0x20000, 0x20000, (uint *)0);
+	/* 256k */
+	dma_xfer((uint *)0x40000, 0x40000, (uint *)0);
+	/* 512k */
+	dma_xfer((uint *)0x80000, 0x80000, (uint *)0);
+	/* 1M */
+	dma_xfer((uint *)0x100000, 0x100000, (uint *)0);
+	/* 2M */
+	dma_xfer((uint *)0x200000, 0x200000, (uint *)0);
+	/* 4M */
+	dma_xfer((uint *)0x400000, 0x400000, (uint *)0);
+
+	for (i = 1; i < dram_size / 0x800000; i++) {
+		dma_xfer((uint *)(0x800000*i), 0x800000, (uint *)0);
+	}
+
+	/*
+	 * Enable errors for ECC.
+	 */
+	ddr->err_disable = 0x00000000;
+	asm("sync;isync");
+#endif	
+}
+
+#endif	/* CONFIG_DDR_ECC */