+++ /dev/null
-/*
- * (C) Copyright 2010,2011
- * Graeme Russ, <graeme.russ@gmail.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
- */
-
-#include <common.h>
-#include <asm/io.h>
-#include <asm/processor-flags.h>
-#include <asm/arch/sc520.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-struct sc520_sdram_info {
- u8 banks;
- u8 columns;
- u8 rows;
- u8 size;
-};
-
-static void sc520_sizemem(void);
-static void sc520_set_dram_timing(void);
-static void sc520_set_dram_refresh_rate(void);
-static void sc520_enable_dram_refresh(void);
-static void sc520_enable_sdram(void);
-
-int dram_init_f(void)
-{
- sc520_sizemem();
- sc520_set_dram_timing();
- sc520_set_dram_refresh_rate();
- sc520_enable_dram_refresh();
- sc520_enable_sdram();
-
- return 0;
-}
-
-static inline void sc520_dummy_write(void)
-{
- writew(0x0000, CACHELINESZ);
-}
-static inline void sc520_issue_sdram_op_mode_select(u8 command)
-{
- writeb(command, &sc520_mmcr->drcctl);
- sc520_dummy_write();
-}
-
-static inline int check_long(u32 test_long)
-{
- u8 i;
- u8 tmp_byte = (u8)(test_long & 0x000000ff);
-
- for (i = 1; i < 4; i++) {
- if ((u8)((test_long >> (i * 8)) & 0x000000ff) != tmp_byte)
- return -1;
- }
-
- return 0;
-}
-
-static inline int write_and_test(u32 data, u32 address)
-{
- writel(data, address);
- if (readl(address) == data)
- return 0; /* Good */
- else
- return -1; /* Bad */
-}
-
-static void sc520_enable_sdram(void)
-{
- u32 par_config;
-
- /* Enable Writes, Caching and Code Execution to SDRAM */
- par_config = readl(&sc520_mmcr->par[3]);
- par_config &= ~(SC520_PAR_EXEC_DIS |
- SC520_PAR_CACHE_DIS |
- SC520_PAR_WRITE_DIS);
- writel(par_config, &sc520_mmcr->par[3]);
-
- par_config = readl(&sc520_mmcr->par[4]);
- par_config &= ~(SC520_PAR_EXEC_DIS |
- SC520_PAR_CACHE_DIS |
- SC520_PAR_WRITE_DIS);
- writel(par_config, &sc520_mmcr->par[4]);
-}
-
-static void sc520_set_dram_timing(void)
-{
- u8 drctmctl = 0x00;
-
-#if defined CONFIG_SYS_SDRAM_DRCTMCTL
- /* just have your hardware designer _GIVE_ you what you need here! */
- drctmctl = CONFIG_SYS_SDRAM_DRCTMCTL;
-#else
- switch (CONFIG_SYS_SDRAM_RAS_CAS_DELAY) {
- case 2:
- break;
- case 3:
- drctmctl |= 0x01;
- break;
- case 4:
- default:
- drctmctl |= 0x02;
- break;
- }
-
- switch (CONFIG_SYS_SDRAM_PRECHARGE_DELAY) {
- case 2:
- break;
- case 3:
- drctmctl |= 0x04;
- break;
- case 4:
- default:
- drctmctl |= 0x08;
- break;
-
- case 6:
- drctmctl |= 0x0c;
- break;
- }
-
- switch (CONFIG_SYS_SDRAM_CAS_LATENCY) {
- case 2:
- break;
- case 3:
- default:
- drctmctl |= 0x10;
- break;
- }
-#endif
- writeb(drctmctl, &sc520_mmcr->drctmctl);
-
- /* Issue load mode register command */
- sc520_issue_sdram_op_mode_select(0x03);
-}
-
-static void sc520_set_dram_refresh_rate(void)
-{
- u8 drctl;
-
- drctl = readb(&sc520_mmcr->drcctl);
- drctl &= 0xcf;
-
- switch (CONFIG_SYS_SDRAM_REFRESH_RATE) {
- case 78:
- break;
- case 156:
- default:
- drctl |= 0x10;
- break;
- case 312:
- drctl |= 0x20;
- break;
- case 624:
- drctl |= 0x30;
- break;
- }
-
- writeb(drctl, &sc520_mmcr->drcctl);
-}
-
-static void sc520_enable_dram_refresh(void)
-{
- u8 drctl;
-
- drctl = readb(&sc520_mmcr->drcctl);
- drctl &= 0x30; /* keep refresh rate */
- drctl |= 0x08; /* enable refresh, normal mode */
-
- writeb(drctl, &sc520_mmcr->drcctl);
-}
-
-static void sc520_get_bank_info(int bank, struct sc520_sdram_info *bank_info)
-{
- u32 col_data;
- u32 row_data;
-
- u32 drcbendadr;
- u16 drccfg;
-
- u8 banks = 0x00;
- u8 columns = 0x00;
- u8 rows = 0x00;
-
- bank_info->banks = 0x00;
- bank_info->columns = 0x00;
- bank_info->rows = 0x00;
- bank_info->size = 0x00;
-
- if ((bank < 0) || (bank > 3)) {
- printf("Bad Bank ID\n");
- return;
- }
-
- /* Save configuration */
- drcbendadr = readl(&sc520_mmcr->drcbendadr);
- drccfg = readw(&sc520_mmcr->drccfg);
-
- /* Setup SDRAM Bank to largest possible size */
- writew(0x000b << (bank * 4), &sc520_mmcr->drccfg);
-
- /* Set ending address for this bank */
- writel(0x000000ff << (bank * 8), &sc520_mmcr->drcbendadr);
-
- /* write col 11 wrap adr */
- if (write_and_test(COL11_DATA, COL11_ADR) != 0)
- goto restore_and_exit;
-
- /* write col 10 wrap adr */
- if (write_and_test(COL10_DATA, COL10_ADR) != 0)
- goto restore_and_exit;
-
- /* write col 9 wrap adr */
- if (write_and_test(COL09_DATA, COL09_ADR) != 0)
- goto restore_and_exit;
-
- /* write col 8 wrap adr */
- if (write_and_test(COL08_DATA, COL08_ADR) != 0)
- goto restore_and_exit;
-
- col_data = readl(COL11_ADR);
-
- /* All four bytes in the read long must be the same */
- if (check_long(col_data) < 0)
- goto restore_and_exit;
-
- if ((col_data >= COL08_DATA) && (col_data <= COL11_DATA))
- columns = (u8)(col_data & 0x000000ff);
- else
- goto restore_and_exit;
-
- /* write row 14 wrap adr */
- if (write_and_test(ROW14_DATA, ROW14_ADR) != 0)
- goto restore_and_exit;
-
- /* write row 13 wrap adr */
- if (write_and_test(ROW13_DATA, ROW13_ADR) != 0)
- goto restore_and_exit;
-
- /* write row 12 wrap adr */
- if (write_and_test(ROW12_DATA, ROW12_ADR) != 0)
- goto restore_and_exit;
-
- /* write row 11 wrap adr */
- if (write_and_test(ROW11_DATA, ROW11_ADR) != 0)
- goto restore_and_exit;
-
- if (write_and_test(ROW10_DATA, ROW10_ADR) != 0)
- goto restore_and_exit;
-
- /*
- * read data @ row 12 wrap adr to determine number of banks,
- * and read data @ row 14 wrap adr to determine number of rows.
- * if data @ row 12 wrap adr is not AA, 11 or 12 we have bad RAM.
- * if data @ row 12 wrap == AA, we only have 2 banks, NOT 4
- * if data @ row 12 wrap == 11 or 12, we have 4 banks,
- */
- row_data = readl(ROW12_ADR);
-
- /* All four bytes in the read long must be the same */
- if (check_long(row_data) != 0)
- goto restore_and_exit;
-
- switch (row_data) {
- case ROW10_DATA:
- banks = 2;
- break;
-
- case ROW11_DATA:
- case ROW12_DATA:
- banks = 4;
- break;
-
- default:
- goto restore_and_exit;
- }
-
- row_data = readl(ROW14_ADR);
-
- /* All four bytes in the read long must be the same */
- if (check_long(row_data) != 0)
- goto restore_and_exit;
-
- switch (row_data) {
- case ROW11_DATA:
- case ROW12_DATA:
- case ROW13_DATA:
- case ROW14_DATA:
- rows = (u8)(row_data & 0x000000ff);
- break;
-
- default:
- goto restore_and_exit;
- }
-
- bank_info->banks = banks;
- bank_info->columns = columns;
- bank_info->rows = rows;
-
- if ((bank_info->banks != 0) &&
- (bank_info->columns != 0) &&
- (bank_info->rows != 0)) {
- bank_info->size = bank_info->rows;
- bank_info->size >>= (11 - bank_info->columns);
- bank_info->size++;
- }
-
-restore_and_exit:
- /* Restore configuration */
- writel(drcbendadr, &sc520_mmcr->drcbendadr);
- writew(drccfg, &sc520_mmcr->drccfg);
-}
-
-static void sc520_setup_sizemem(void)
-{
- u8 i;
-
- /* Disable write buffer */
- writeb(0x00, &sc520_mmcr->dbctl);
-
- /* Disable ECC */
- writeb(0x00, &sc520_mmcr->eccctl);
-
- /* Set slowest SDRAM timing */
- writeb(0x1e, &sc520_mmcr->drctmctl);
-
- /* Issue a NOP to all SDRAM banks */
- sc520_issue_sdram_op_mode_select(0x01);
-
- /* Delay for 100 microseconds */
- udelay(100);
-
- /* Issue 'All Banks Precharge' command */
- sc520_issue_sdram_op_mode_select(0x02);
-
- /* Issue 2 'Auto Refresh Enable' command */
- sc520_issue_sdram_op_mode_select(0x04);
- sc520_dummy_write();
-
- /* Issue 'Load Mode Register' command */
- sc520_issue_sdram_op_mode_select(0x03);
-
- /* Issue 8 more 'Auto Refresh Enable' commands */
- sc520_issue_sdram_op_mode_select(0x04);
- for (i = 0; i < 7; i++)
- sc520_dummy_write();
-
- /* Set control register to 'Normal Mode' */
- writeb(0x00, &sc520_mmcr->drcctl);
-}
-
-static void sc520_sizemem(void)
-{
- struct sc520_sdram_info sdram_info[4];
- u8 bank_config = 0x00;
- u8 end_addr = 0x00;
- u16 drccfg = 0x0000;
- u32 drcbendadr = 0x00000000;
- u8 i;
-
- /* Use PARs to disable caching of maximum allowable 256MB SDRAM */
- writel(SC520_SDRAM1_PAR | SC520_PAR_CACHE_DIS, &sc520_mmcr->par[3]);
- writel(SC520_SDRAM2_PAR | SC520_PAR_CACHE_DIS, &sc520_mmcr->par[4]);
-
- sc520_setup_sizemem();
-
- gd->ram_size = 0;
-
- /* Size each SDRAM bank */
- for (i = 0; i <= 3; i++) {
- sc520_get_bank_info(i, &sdram_info[i]);
-
- if (sdram_info[i].banks != 0) {
- /* Update Configuration register */
- bank_config = sdram_info[i].columns - 8;
-
- if (sdram_info[i].banks == 4)
- bank_config |= 0x08;
-
- drccfg |= bank_config << (i * 4);
-
- /* Update End Address register */
- end_addr += sdram_info[i].size;
- drcbendadr |= (end_addr | 0x80) << (i * 8);
-
- gd->ram_size += sdram_info[i].size << 22;
- }
-
- /* Issue 'All Banks Precharge' command */
- sc520_issue_sdram_op_mode_select(0x02);
-
- /* Set control register to 'Normal Mode' */
- writeb(0x00, &sc520_mmcr->drcctl);
- }
-
- writel(drcbendadr, &sc520_mmcr->drcbendadr);
- writew(drccfg, &sc520_mmcr->drccfg);
-
- /* Clear PARs preventing caching of SDRAM */
- writel(0x00000000, &sc520_mmcr->par[3]);
- writel(0x00000000, &sc520_mmcr->par[4]);
-}
-
-int dram_init(void)
-{
- ulong dram_ctrl;
- ulong dram_present = 0x00000000;
-
- /*
- * We read-back the configuration of the dram
- * controller that the assembly code wrote
- */
- dram_ctrl = readl(&sc520_mmcr->drcbendadr);
-
- gd->bd->bi_dram[0].start = 0;
- if (dram_ctrl & 0x80) {
- /* bank 0 enabled */
- gd->bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
- dram_present = gd->bd->bi_dram[1].start;
- gd->bd->bi_dram[0].size = gd->bd->bi_dram[1].start;
- } else {
- gd->bd->bi_dram[0].size = 0;
- gd->bd->bi_dram[1].start = gd->bd->bi_dram[0].start;
- }
-
- if (dram_ctrl & 0x8000) {
- /* bank 1 enabled */
- gd->bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
- dram_present = gd->bd->bi_dram[2].start;
- gd->bd->bi_dram[1].size = gd->bd->bi_dram[2].start -
- gd->bd->bi_dram[1].start;
- } else {
- gd->bd->bi_dram[1].size = 0;
- gd->bd->bi_dram[2].start = gd->bd->bi_dram[1].start;
- }
-
- if (dram_ctrl & 0x800000) {
- /* bank 2 enabled */
- gd->bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
- dram_present = gd->bd->bi_dram[3].start;
- gd->bd->bi_dram[2].size = gd->bd->bi_dram[3].start -
- gd->bd->bi_dram[2].start;
- } else {
- gd->bd->bi_dram[2].size = 0;
- gd->bd->bi_dram[3].start = gd->bd->bi_dram[2].start;
- }
-
- if (dram_ctrl & 0x80000000) {
- /* bank 3 enabled */
- dram_present = (dram_ctrl & 0x7f000000) >> 2;
- gd->bd->bi_dram[3].size = dram_present -
- gd->bd->bi_dram[3].start;
- } else {
- gd->bd->bi_dram[3].size = 0;
- }
-
- gd->ram_size = dram_present;
-
- return 0;
-}
projects / karo-tx-uboot.git / blobdiff