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Diffstat (limited to 'board/evb64260/sdram_init.c')
| -rw-r--r-- | board/evb64260/sdram_init.c | 650 |
1 files changed, 0 insertions, 650 deletions
diff --git a/board/evb64260/sdram_init.c b/board/evb64260/sdram_init.c deleted file mode 100644 index 12b1308..0000000 --- a/board/evb64260/sdram_init.c +++ /dev/null @@ -1,650 +0,0 @@ -/* - * (C) Copyright 2001 - * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* sdram_init.c - automatic memory sizing */ - -#include <common.h> -#include <74xx_7xx.h> -#include <galileo/memory.h> -#include <galileo/pci.h> -#include <galileo/gt64260R.h> -#include <net.h> -#include <linux/compiler.h> - -#include "eth.h" -#include "mpsc.h" -#include "i2c.h" -#include "64260.h" - -DECLARE_GLOBAL_DATA_PTR; - -/* #define DEBUG */ -#define MAP_PCI - -#ifdef DEBUG -#define DP(x) x -#else -#define DP(x) -#endif - -#define GB (1 << 30) - -/* structure to store the relevant information about an sdram bank */ -typedef struct sdram_info { - uchar drb_size; - uchar registered, ecc; - uchar tpar; - uchar tras_clocks; - uchar burst_len; - uchar banks, slot; - int size; /* detected size, not from I2C but from dram_size() */ -} sdram_info_t; - -#ifdef DEBUG -void dump_dimm_info (struct sdram_info *d) -{ - static const char *ecc_legend[] = { "", " Parity", " ECC" }; - - printf ("dimm%s %sDRAM: %dMibytes:\n", - ecc_legend[d->ecc], - d->registered ? "R" : "", (d->size >> 20)); - printf (" drb=%d tpar=%d tras=%d burstlen=%d banks=%d slot=%d\n", - d->drb_size, d->tpar, d->tras_clocks, d->burst_len, - d->banks, d->slot); -} -#endif - -static int -memory_map_bank (unsigned int bankNo, - unsigned int bankBase, unsigned int bankLength) -{ -#ifdef DEBUG - if (bankLength > 0) { - printf ("mapping bank %d at %08x - %08x\n", - bankNo, bankBase, bankBase + bankLength - 1); - } else { - printf ("unmapping bank %d\n", bankNo); - } -#endif - - memoryMapBank (bankNo, bankBase, bankLength); - - return 0; -} - -#ifdef MAP_PCI -static int -memory_map_bank_pci (unsigned int bankNo, - unsigned int bankBase, unsigned int bankLength) -{ - PCI_HOST host; - - for (host = PCI_HOST0; host <= PCI_HOST1; host++) { - const int features = - PREFETCH_ENABLE | - DELAYED_READ_ENABLE | - AGGRESSIVE_PREFETCH | - READ_LINE_AGGRESSIVE_PREFETCH | - READ_MULTI_AGGRESSIVE_PREFETCH | - MAX_BURST_4 | PCI_NO_SWAP; - - pciMapMemoryBank (host, bankNo, bankBase, bankLength); - - pciSetRegionSnoopMode (host, bankNo, PCI_SNOOP_WB, bankBase, - bankLength); - - pciSetRegionFeatures (host, bankNo, features, bankBase, - bankLength); - } - return 0; -} -#endif - -/* ------------------------------------------------------------------------- */ - -/* much of this code is based on (or is) the code in the pip405 port */ -/* thanks go to the authors of said port - Josh */ - - -/* - * translate ns.ns/10 coding of SPD timing values - * into 10 ps unit values - */ -static inline unsigned short NS10to10PS (unsigned char spd_byte) -{ - unsigned short ns, ns10; - - /* isolate upper nibble */ - ns = (spd_byte >> 4) & 0x0F; - /* isolate lower nibble */ - ns10 = (spd_byte & 0x0F); - - return (ns * 100 + ns10 * 10); -} - -/* - * translate ns coding of SPD timing values - * into 10 ps unit values - */ -static inline unsigned short NSto10PS (unsigned char spd_byte) -{ - return (spd_byte * 100); -} - -#ifdef CONFIG_ZUMA_V2 -static int check_dimm (uchar slot, sdram_info_t * info) -{ - /* assume 2 dimms, 2 banks each 256M - we dont have an - * dimm i2c so rely on the detection routines later */ - - memset (info, 0, sizeof (*info)); - - info->slot = slot; - info->banks = 2; /* Detect later */ - info->registered = 0; - info->drb_size = 32; /* 16 - 256MBit, 32 - 512MBit - but doesn't matter, both do same - thing in setup_sdram() */ - info->tpar = 3; - info->tras_clocks = 5; - info->burst_len = 4; -#ifdef CONFIG_ECC - info->ecc = 0; /* Detect later */ -#endif /* CONFIG_ECC */ - return 0; -} - -#elif defined(CONFIG_P3G4) - -static int check_dimm (uchar slot, sdram_info_t * info) -{ - memset (info, 0, sizeof (*info)); - - if (slot) - return 0; - - info->slot = slot; - info->banks = 1; - info->registered = 0; - info->drb_size = 4; - info->tpar = 3; - info->tras_clocks = 6; - info->burst_len = 4; -#ifdef CONFIG_ECC - info->ecc = 2; -#endif - return 0; -} - -#else /* ! CONFIG_ZUMA_V2 && ! CONFIG_P3G4 */ - -/* This code reads the SPD chip on the sdram and populates - * the array which is passed in with the relevant information */ -static int check_dimm (uchar slot, sdram_info_t * info) -{ - uchar addr = slot == 0 ? DIMM0_I2C_ADDR : DIMM1_I2C_ADDR; - int ret; - uchar rows, cols, sdram_banks, supp_cal, width, cal_val; - ulong tmemclk; - uchar trp_clocks, trcd_clocks; - uchar data[128]; - - get_clocks (); - - tmemclk = 1000000000 / (gd->bus_clk / 100); /* in 10 ps units */ - -#ifdef CONFIG_EVB64260_750CX - if (0 != slot) { - printf ("check_dimm: The EVB-64260-750CX only has 1 DIMM,"); - printf (" called with slot=%d insetad!\n", slot); - return 0; - } -#endif - DP (puts ("before i2c read\n")); - - ret = i2c_read (addr, 0, 128, data, 0); - - DP (puts ("after i2c read\n")); - - /* zero all the values */ - memset (info, 0, sizeof (*info)); - - if (ret) { - DP (printf ("No DIMM in slot %d [err = %x]\n", slot, ret)); - return 0; - } - - /* first, do some sanity checks */ - if (data[2] != 0x4) { - printf ("Not SDRAM in slot %d\n", slot); - return 0; - } - - /* get various information */ - rows = data[3]; - cols = data[4]; - info->banks = data[5]; - sdram_banks = data[17]; - width = data[13] & 0x7f; - - DP (printf - ("sdram_banks: %d, banks: %d\n", sdram_banks, info->banks)); - - /* check if the memory is registered */ - if (data[21] & (BIT1 | BIT4)) - info->registered = 1; - -#ifdef CONFIG_ECC - /* check for ECC/parity [0 = none, 1 = parity, 2 = ecc] */ - info->ecc = (data[11] & 2) >> 1; -#endif - - /* bit 1 is CL2, bit 2 is CL3 */ - supp_cal = (data[18] & 0x6) >> 1; - - /* compute the relevant clock values */ - trp_clocks = (NSto10PS (data[27]) + (tmemclk - 1)) / tmemclk; - trcd_clocks = (NSto10PS (data[29]) + (tmemclk - 1)) / tmemclk; - info->tras_clocks = (NSto10PS (data[30]) + (tmemclk - 1)) / tmemclk; - - DP (printf ("trp = %d\ntrcd_clocks = %d\ntras_clocks = %d\n", - trp_clocks, trcd_clocks, info->tras_clocks)); - - /* try a CAS latency of 3 first... */ - cal_val = 0; - if (supp_cal & 3) { - if (NS10to10PS (data[9]) <= tmemclk) - cal_val = 3; - } - - /* then 2... */ - if (supp_cal & 2) { - if (NS10to10PS (data[23]) <= tmemclk) - cal_val = 2; - } - - DP (printf ("cal_val = %d\n", cal_val)); - - /* bummer, did't work... */ - if (cal_val == 0) { - DP (printf ("Couldn't find a good CAS latency\n")); - return 0; - } - - /* get the largest delay -- these values need to all be the same - * see Res#6 */ - info->tpar = cal_val; - if (trp_clocks > info->tpar) - info->tpar = trp_clocks; - if (trcd_clocks > info->tpar) - info->tpar = trcd_clocks; - - DP (printf ("tpar set to: %d\n", info->tpar)); - -#ifdef CONFIG_SYS_BROKEN_CL2 - if (info->tpar == 2) { - info->tpar = 3; - DP (printf ("tpar fixed-up to: %d\n", info->tpar)); - } -#endif - /* compute the module DRB size */ - info->drb_size = - (((1 << (rows + cols)) * sdram_banks) * width) / _16M; - - DP (printf ("drb_size set to: %d\n", info->drb_size)); - - /* find the burst len */ - info->burst_len = data[16] & 0xf; - if ((info->burst_len & 8) == 8) { - info->burst_len = 1; - } else if ((info->burst_len & 4) == 4) { - info->burst_len = 0; - } else { - return 0; - } - - info->slot = slot; - return 0; -} -#endif /* ! CONFIG_ZUMA_V2 */ - -static int setup_sdram_common (sdram_info_t info[2]) -{ - ulong tmp; - int tpar = 2, tras_clocks = 5, registered = 1; - __maybe_unused int ecc = 2; - - if (!info[0].banks && !info[1].banks) - return 0; - - if (info[0].banks) { - if (info[0].tpar > tpar) - tpar = info[0].tpar; - if (info[0].tras_clocks > tras_clocks) - tras_clocks = info[0].tras_clocks; - if (!info[0].registered) - registered = 0; - if (info[0].ecc != 2) - ecc = 0; - } - - if (info[1].banks) { - if (info[1].tpar > tpar) - tpar = info[1].tpar; - if (info[1].tras_clocks > tras_clocks) - tras_clocks = info[1].tras_clocks; - if (!info[1].registered) - registered = 0; - if (info[1].ecc != 2) - ecc = 0; - } - - /* SDRAM configuration */ - tmp = GTREGREAD (SDRAM_CONFIGURATION); - - /* Turn on physical interleave if both DIMMs - * have even numbers of banks. */ - if ((info[0].banks == 0 || info[0].banks == 2) && - (info[1].banks == 0 || info[1].banks == 2)) { - /* physical interleave on */ - tmp &= ~(1 << 15); - } else { - /* physical interleave off */ - tmp |= (1 << 15); - } - - tmp |= (registered << 17); - - /* Use buffer 1 to return read data to the CPU - * See Res #12 */ - tmp |= (1 << 26); - - GT_REG_WRITE (SDRAM_CONFIGURATION, tmp); - DP (printf ("SDRAM config: %08x\n", GTREGREAD (SDRAM_CONFIGURATION))); - - /* SDRAM timing */ - tmp = (((tpar == 3) ? 2 : 1) | - (((tpar == 3) ? 2 : 1) << 2) | - (((tpar == 3) ? 2 : 1) << 4) | (tras_clocks << 8)); - -#ifdef CONFIG_ECC - /* Setup ECC */ - if (ecc == 2) - tmp |= 1 << 13; -#endif /* CONFIG_ECC */ - - GT_REG_WRITE (SDRAM_TIMING, tmp); - DP (printf ("SDRAM timing: %08x (%d,%d,%d,%d)\n", - GTREGREAD (SDRAM_TIMING), tpar, tpar, tpar, tras_clocks)); - - /* SDRAM address decode register */ - /* program this with the default value */ - GT_REG_WRITE (SDRAM_ADDRESS_DECODE, 0x2); - DP (printf ("SDRAM decode: %08x\n", - GTREGREAD (SDRAM_ADDRESS_DECODE))); - - return 0; -} - -/* sets up the GT properly with information passed in */ -static int setup_sdram (sdram_info_t * info) -{ - ulong tmp; - ulong *addr = 0; - __maybe_unused ulong check; - int i; - - /* sanity checking */ - if (!info->banks) - return 0; - - /* ---------------------------- */ - /* Program the GT with the discovered data */ - - /* bank parameters */ - tmp = (0xf << 16); /* leave all virt bank pages open */ - - DP (printf ("drb_size: %d\n", info->drb_size)); - switch (info->drb_size) { - case 1: - tmp |= (1 << 14); - break; - case 4: - case 8: - tmp |= (2 << 14); - break; - case 16: - case 32: - tmp |= (3 << 14); - break; - default: - printf ("Error in dram size calculation\n"); - return 1; - } - - /* SDRAM bank parameters */ - /* the param registers for slot 1 (banks 2+3) are offset by 0x8 */ - GT_REG_WRITE (SDRAM_BANK0PARAMETERS + (info->slot * 0x8), tmp); - GT_REG_WRITE (SDRAM_BANK1PARAMETERS + (info->slot * 0x8), tmp); - DP (printf - ("SDRAM bankparam slot %d (bank %d+%d): %08lx\n", info->slot, - info->slot * 2, (info->slot * 2) + 1, tmp)); - - /* set the SDRAM configuration for each bank */ - for (i = info->slot * 2; i < ((info->slot * 2) + info->banks); i++) { - DP (printf ("*** Running a MRS cycle for bank %d ***\n", i)); - - /* map the bank */ - memory_map_bank (i, 0, GB / 4); - - /* set SDRAM mode */ - GT_REG_WRITE (SDRAM_OPERATION_MODE, 0x3); - check = GTREGREAD (SDRAM_OPERATION_MODE); - - /* dummy write */ - *addr = 0; - - /* wait for the command to complete */ - while ((GTREGREAD (SDRAM_OPERATION_MODE) & (1 << 31)) == 0); - - /* switch back to normal operation mode */ - GT_REG_WRITE (SDRAM_OPERATION_MODE, 0); - check = GTREGREAD (SDRAM_OPERATION_MODE); - - /* unmap the bank */ - memory_map_bank (i, 0, 0); - DP (printf ("*** MRS cycle for bank %d done ***\n", i)); - } - - return 0; -} - -/* - * Check memory range for valid RAM. A simple memory test determines - * the actually available RAM size between addresses `base' and - * `base + maxsize'. Some (not all) hardware errors are detected: - * - short between address lines - * - short between data lines - */ -static long int dram_size (long int *base, long int maxsize) -{ - volatile long int *addr, *b = base; - long int cnt, val, save1, save2; - -#define STARTVAL (1<<20) /* start test at 1M */ - for (cnt = STARTVAL / sizeof (long); cnt < maxsize / sizeof (long); - cnt <<= 1) { - addr = base + cnt; /* pointer arith! */ - - save1 = *addr; /* save contents of addr */ - save2 = *b; /* save contents of base */ - - *addr = cnt; /* write cnt to addr */ - *b = 0; /* put null at base */ - - /* check at base address */ - if ((*b) != 0) { - *addr = save1; /* restore *addr */ - *b = save2; /* restore *b */ - return (0); - } - val = *addr; /* read *addr */ - - *addr = save1; - *b = save2; - - if (val != cnt) { - /* fix boundary condition.. STARTVAL means zero */ - if (cnt == STARTVAL / sizeof (long)) - cnt = 0; - return (cnt * sizeof (long)); - } - } - return maxsize; -} - -/* ------------------------------------------------------------------------- */ - -/* U-Boot interface function to SDRAM init - this is where all the - * controlling logic happens */ -phys_size_t initdram (int board_type) -{ - ulong checkbank[4] = {[0 ... 3] = 0 }; - int bank_no; - ulong total; - int nhr; - sdram_info_t dimm_info[2]; - - - /* first, use the SPD to get info about the SDRAM */ - - /* check the NHR bit and skip mem init if it's already done */ - nhr = get_hid0 () & (1 << 16); - - if (nhr) { - printf ("Skipping SDRAM setup due to NHR bit being set\n"); - } else { - /* DIMM0 */ - check_dimm (0, &dimm_info[0]); - - /* DIMM1 */ -#ifndef CONFIG_EVB64260_750CX /* EVB64260_750CX has only 1 DIMM */ - check_dimm (1, &dimm_info[1]); -#else /* CONFIG_EVB64260_750CX */ - memset (&dimm_info[1], 0, sizeof (sdram_info_t)); -#endif - - /* unmap all banks */ - memory_map_bank (0, 0, 0); - memory_map_bank (1, 0, 0); - memory_map_bank (2, 0, 0); - memory_map_bank (3, 0, 0); - - /* Now, program the GT with the correct values */ - if (setup_sdram_common (dimm_info)) { - printf ("Setup common failed.\n"); - } - - if (setup_sdram (&dimm_info[0])) { - printf ("Setup for DIMM1 failed.\n"); - } - - if (setup_sdram (&dimm_info[1])) { - printf ("Setup for DIMM2 failed.\n"); - } - - /* set the NHR bit */ - set_hid0 (get_hid0 () | (1 << 16)); - } - /* next, size the SDRAM banks */ - - total = 0; - if (dimm_info[0].banks > 0) - checkbank[0] = 1; - if (dimm_info[0].banks > 1) - checkbank[1] = 1; - if (dimm_info[0].banks > 2) - printf ("Error, SPD claims DIMM1 has >2 banks\n"); - - if (dimm_info[1].banks > 0) - checkbank[2] = 1; - if (dimm_info[1].banks > 1) - checkbank[3] = 1; - if (dimm_info[1].banks > 2) - printf ("Error, SPD claims DIMM2 has >2 banks\n"); - - /* Generic dram sizer: works even if we don't have i2c DIMMs, - * as long as the timing settings are more or less correct */ - - /* - * pass 1: size all the banks, using first bat (0-256M) - * limitation: we only support 256M per bank due to - * us only having 1 BAT for all DRAM - */ - for (bank_no = 0; bank_no < CONFIG_SYS_DRAM_BANKS; bank_no++) { - /* skip over banks that are not populated */ - if (!checkbank[bank_no]) - continue; - - DP (printf ("checking bank %d\n", bank_no)); - - memory_map_bank (bank_no, 0, GB / 4); - checkbank[bank_no] = dram_size (NULL, GB / 4); - memory_map_bank (bank_no, 0, 0); - - DP (printf ("bank %d %08lx\n", bank_no, checkbank[bank_no])); - } - - /* - * pass 2: contiguously map each bank into physical address - * space. - */ - dimm_info[0].banks = dimm_info[1].banks = 0; - for (bank_no = 0; bank_no < CONFIG_SYS_DRAM_BANKS; bank_no++) { - if (!checkbank[bank_no]) - continue; - - dimm_info[bank_no / 2].banks++; - dimm_info[bank_no / 2].size += checkbank[bank_no]; - - memory_map_bank (bank_no, total, checkbank[bank_no]); -#ifdef MAP_PCI - memory_map_bank_pci (bank_no, total, checkbank[bank_no]); -#endif - total += checkbank[bank_no]; - } - -#ifdef CONFIG_ECC -#ifdef CONFIG_ZUMA_V2 - /* - * We always enable ECC when bank 2 and 3 are unpopulated - * If we 2 or 3 are populated, we CAN'T support ECC. - * (Zuma boards only support ECC in banks 0 and 1; assume that - * in that configuration, ECC chips are mounted, even for stacked - * chips) - */ - if (checkbank[2] == 0 && checkbank[3] == 0) { - dimm_info[0].ecc = 2; - GT_REG_WRITE (SDRAM_TIMING, - GTREGREAD (SDRAM_TIMING) | (1 << 13)); - /* TODO: do we have to run MRS cycles again? */ - } -#endif /* CONFIG_ZUMA_V2 */ - - if (GTREGREAD (SDRAM_TIMING) & (1 << 13)) { - puts ("[ECC] "); - } -#endif /* CONFIG_ECC */ - -#ifdef DEBUG - dump_dimm_info (&dimm_info[0]); - dump_dimm_info (&dimm_info[1]); -#endif - /* TODO: return at MOST 256M? */ - /* return total > GB/4 ? GB/4 : total; */ - return total; -} |