* Patch by Eran Liberty
Add support for the Freescale MPC8349ADS board.
diff --git a/cpu/mpc83xx/spd_sdram.c b/cpu/mpc83xx/spd_sdram.c
new file mode 100644
index 0000000..5bd112c
--- /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 */