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- /***************************************************************************
- * Copyright (C) 2008 by John McCarthy *
- * jgmcc@magma.ca *
- * *
- * Copyright (C) 2008 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * Copyright (C) 2008 by David T.L. Wong *
- * *
- * 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. *
- ***************************************************************************/
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include <string.h>
- #include "log.h"
- #include "mips32.h"
- #include "mips32_dmaacc.h"
-
- /*
- * The following logic shamelessly cloned from HairyDairyMaid's wrt54g_debrick
- * to support the Broadcom BCM5352 SoC in the Linksys WRT54GL wireless router
- * (and any others that support EJTAG DMA transfers).
- * Note: This only supports memory read/write. Since the BCM5352 doesn't
- * appear to support PRACC accesses, all debug functions except halt
- * do not work. Still, this does allow erasing/writing flash as well as
- * displaying/modifying memory and memory mapped registers.
- */
-
- static int ejtag_dma_read(mips_ejtag_t *ejtag_info, u32 addr, u32 *data)
- {
- u32 v;
- u32 ejtag_ctrl;
- int retries = RETRY_ATTEMPTS;
-
- begin_ejtag_dma_read:
-
- // Setup Address
- v = addr;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Initiate DMA Read & set DSTRT
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DRWN | EJTAG_CTRL_DMA_WORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- // Wait for DSTRT to Clear
- do {
- ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- } while(ejtag_ctrl & EJTAG_CTRL_DSTRT);
-
- // Read Data
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
- mips_ejtag_drscan_32(ejtag_info, data);
-
- // Clear DMA & Check DERR
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- if (ejtag_ctrl & EJTAG_CTRL_DERR)
- {
- if (retries--) {
- printf("DMA Read Addr = %08x Data = ERROR ON READ (retrying)\n", addr);
- goto begin_ejtag_dma_read;
- } else printf("DMA Read Addr = %08x Data = ERROR ON READ\n", addr);
- return ERROR_JTAG_DEVICE_ERROR;
- }
-
- return ERROR_OK;
- }
-
- static int ejtag_dma_read_h(mips_ejtag_t *ejtag_info, u32 addr, u16 *data)
- {
- u32 v;
- u32 ejtag_ctrl;
- int retries = RETRY_ATTEMPTS;
-
- begin_ejtag_dma_read_h:
-
- // Setup Address
- v = addr;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Initiate DMA Read & set DSTRT
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DRWN | EJTAG_CTRL_DMA_HALFWORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- // Wait for DSTRT to Clear
- do {
- ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- } while(ejtag_ctrl & EJTAG_CTRL_DSTRT);
-
- // Read Data
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Clear DMA & Check DERR
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- if (ejtag_ctrl & EJTAG_CTRL_DERR)
- {
- if (retries--) {
- printf("DMA Read Addr = %08x Data = ERROR ON READ (retrying)\n", addr);
- goto begin_ejtag_dma_read_h;
- } else printf("DMA Read Addr = %08x Data = ERROR ON READ\n", addr);
- return ERROR_JTAG_DEVICE_ERROR;
- }
-
- // Handle the bigendian/littleendian
- if ( addr & 0x2 ) *data = (v>>16)&0xffff ;
- else *data = (v&0x0000ffff) ;
-
- return ERROR_OK;
- }
-
- static int ejtag_dma_read_b(mips_ejtag_t *ejtag_info, u32 addr, u8 *data)
- {
- u32 v;
- u32 ejtag_ctrl;
- int retries = RETRY_ATTEMPTS;
-
- begin_ejtag_dma_read_b:
-
- // Setup Address
- v = addr;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Initiate DMA Read & set DSTRT
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DRWN | EJTAG_CTRL_DMA_BYTE | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- // Wait for DSTRT to Clear
- do {
- ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- } while(ejtag_ctrl & EJTAG_CTRL_DSTRT);
-
- // Read Data
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Clear DMA & Check DERR
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- if (ejtag_ctrl & EJTAG_CTRL_DERR)
- {
- if (retries--) {
- printf("DMA Read Addr = %08x Data = ERROR ON READ (retrying)\n", addr);
- goto begin_ejtag_dma_read_b;
- } else printf("DMA Read Addr = %08x Data = ERROR ON READ\n", addr);
- return ERROR_JTAG_DEVICE_ERROR;
- }
-
- // Handle the bigendian/littleendian
- switch(addr & 0x3) {
- case 0: *data = v & 0xff; break;
- case 1: *data = (v>>8) & 0xff; break;
- case 2: *data = (v>>16) & 0xff; break;
- case 3: *data = (v>>24) & 0xff; break;
- }
-
- return ERROR_OK;
- }
-
- static int ejtag_dma_write(mips_ejtag_t *ejtag_info, u32 addr, u32 data)
- {
- u32 v;
- u32 ejtag_ctrl;
- int retries = RETRY_ATTEMPTS;
-
- begin_ejtag_dma_write:
-
- // Setup Address
- v = addr;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Setup Data
- v = data;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Initiate DMA Write & set DSTRT
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DMA_WORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- // Wait for DSTRT to Clear
- do {
- ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- } while(ejtag_ctrl & EJTAG_CTRL_DSTRT);
-
- // Clear DMA & Check DERR
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- if (ejtag_ctrl & EJTAG_CTRL_DERR)
- {
- if (retries--) {
- printf("DMA Write Addr = %08x Data = ERROR ON WRITE (retrying)\n", addr);
- goto begin_ejtag_dma_write;
- } else printf("DMA Write Addr = %08x Data = ERROR ON WRITE\n", addr);
- return ERROR_JTAG_DEVICE_ERROR;
- }
-
- return ERROR_OK;
- }
-
- static int ejtag_dma_write_h(mips_ejtag_t *ejtag_info, u32 addr, u32 data)
- {
- u32 v;
- u32 ejtag_ctrl;
- int retries = RETRY_ATTEMPTS;
-
-
- // Handle the bigendian/littleendian
- data &= 0xffff;
- data |= data<<16;
-
- begin_ejtag_dma_write_h:
-
- // Setup Address
- v = addr;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Setup Data
- v = data;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Initiate DMA Write & set DSTRT
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DMA_HALFWORD | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- // Wait for DSTRT to Clear
- do {
- ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- } while(ejtag_ctrl & EJTAG_CTRL_DSTRT);
-
- // Clear DMA & Check DERR
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- if (ejtag_ctrl & EJTAG_CTRL_DERR)
- {
- if (retries--) {
- printf("DMA Write Addr = %08x Data = ERROR ON WRITE (retrying)\n", addr);
- goto begin_ejtag_dma_write_h;
- } else printf("DMA Write Addr = %08x Data = ERROR ON WRITE\n", addr);
- return ERROR_JTAG_DEVICE_ERROR;
- }
-
- return ERROR_OK;
- }
-
- static int ejtag_dma_write_b(mips_ejtag_t *ejtag_info, u32 addr, u32 data)
- {
- u32 v;
- u32 ejtag_ctrl;
- int retries = RETRY_ATTEMPTS;
-
-
- // Handle the bigendian/littleendian
- data &= 0xff;
- data |= data<<8;
- data |= data<<16;
-
- begin_ejtag_dma_write_b:
-
- // Setup Address
- v = addr;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Setup Data
- v = data;
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
- mips_ejtag_drscan_32(ejtag_info, &v);
-
- // Initiate DMA Write & set DSTRT
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = EJTAG_CTRL_DMAACC | EJTAG_CTRL_DMA_BYTE | EJTAG_CTRL_DSTRT | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- // Wait for DSTRT to Clear
- do {
- ejtag_ctrl = EJTAG_CTRL_DMAACC | ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- } while(ejtag_ctrl & EJTAG_CTRL_DSTRT);
-
- // Clear DMA & Check DERR
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- ejtag_ctrl = ejtag_info->ejtag_ctrl;
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- if (ejtag_ctrl & EJTAG_CTRL_DERR)
- {
- if (retries--) {
- printf("DMA Write Addr = %08x Data = ERROR ON WRITE (retrying)\n", addr);
- goto begin_ejtag_dma_write_b;
- } else printf("DMA Write Addr = %08x Data = ERROR ON WRITE\n", addr);
- return ERROR_JTAG_DEVICE_ERROR;
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_read_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int count, void *buf)
- {
- switch (size)
- {
- case 1:
- return mips32_dmaacc_read_mem8(ejtag_info, addr, count, (u8*)buf);
- case 2:
- return mips32_dmaacc_read_mem16(ejtag_info, addr, count, (u16*)buf);
- case 4:
- return mips32_dmaacc_read_mem32(ejtag_info, addr, count, (u32*)buf);
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_read_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf)
- {
- int i;
- int retval;
-
- for(i=0; i<count; i++) {
- if((retval=ejtag_dma_read(ejtag_info, addr+i*sizeof(*buf), &buf[i])) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_read_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf)
- {
- int i;
- int retval;
-
- for(i=0; i<count; i++) {
- if((retval=ejtag_dma_read_h(ejtag_info, addr+i*sizeof(*buf), &buf[i])) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_read_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf)
- {
- int i;
- int retval;
-
- for(i=0; i<count; i++) {
- if((retval=ejtag_dma_read_b(ejtag_info, addr+i*sizeof(*buf), &buf[i])) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_write_mem(mips_ejtag_t *ejtag_info, u32 addr, int size, int count, void *buf)
- {
- switch (size)
- {
- case 1:
- return mips32_dmaacc_write_mem8(ejtag_info, addr, count, (u8*)buf);
- case 2:
- return mips32_dmaacc_write_mem16(ejtag_info, addr, count,(u16*)buf);
- case 4:
- return mips32_dmaacc_write_mem32(ejtag_info, addr, count, (u32*)buf);
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_write_mem32(mips_ejtag_t *ejtag_info, u32 addr, int count, u32 *buf)
- {
- int i;
- int retval;
-
- for(i=0; i<count; i++) {
- if((retval=ejtag_dma_write(ejtag_info, addr+i*sizeof(*buf), buf[i])) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_write_mem16(mips_ejtag_t *ejtag_info, u32 addr, int count, u16 *buf)
- {
- int i;
- int retval;
-
- for(i=0; i<count; i++) {
- if((retval=ejtag_dma_write_h(ejtag_info, addr+i*sizeof(*buf), buf[i])) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
-
- int mips32_dmaacc_write_mem8(mips_ejtag_t *ejtag_info, u32 addr, int count, u8 *buf)
- {
- int i;
- int retval;
-
- for(i=0; i<count; i++) {
- if((retval=ejtag_dma_write_b(ejtag_info, addr+i*sizeof(*buf), buf[i])) != ERROR_OK)
- return retval;
- }
-
- return ERROR_OK;
- }
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