* *
* Copyright (C) 2008 by David T.L. Wong *
* *
+ * Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com> *
+ * *
* 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 *
Nico Coesel
*/
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
jtag_add_clocks(5);
jtag_execute_queue();
-
return ERROR_OK;
}
if ((retval = mips32_pracc_exec_read(&ctx, address)) != ERROR_OK)
return retval;
-
}
if (cycle == 0)
return retval;
}
+
+/* fastdata upload/download requires an initialized working area
+ * to load the download code; it should not be called otherwise
+ * fetch order from the fastdata area
+ * 1. start addr
+ * 2. end addr
+ * 3. data ...
+ */
+int mips32_pracc_fastdata_xfer(struct mips_ejtag *ejtag_info, struct working_area *source,
+ int write, uint32_t addr, int count, uint32_t *buf)
+{
+ uint32_t handler_code[] = {
+ /* caution when editing, table is modified below */
+ /* r15 points to the start of this code */
+ MIPS32_SW(8,MIPS32_FASTDATA_HANDLER_SIZE - 4,15),
+ MIPS32_SW(9,MIPS32_FASTDATA_HANDLER_SIZE - 8,15),
+ MIPS32_SW(10,MIPS32_FASTDATA_HANDLER_SIZE - 12,15),
+ MIPS32_SW(11,MIPS32_FASTDATA_HANDLER_SIZE - 16,15),
+ /* start of fastdata area in t0 */
+ MIPS32_LUI(8,UPPER16(MIPS32_PRACC_FASTDATA_AREA)),
+ MIPS32_ORI(8,8,LOWER16(MIPS32_PRACC_FASTDATA_AREA)),
+ MIPS32_LW(9,0,8), /* start addr in t1 */
+ MIPS32_LW(10,0,8), /* end addr to t2 */
+ /* loop: */
+ /* 8 */ MIPS32_LW(11,0,0), /* lw t3,[t8 | r9] */
+ /* 9 */ MIPS32_SW(11,0,0), /* sw t3,[r9 | r8] */
+ MIPS32_BNE(10,9,NEG16(3)), /* bne $t2,t1,loop */
+ MIPS32_ADDI(9,9,4), /* addi t1,t1,4 */
+
+ MIPS32_LW(8,MIPS32_FASTDATA_HANDLER_SIZE - 4,15),
+ MIPS32_LW(9,MIPS32_FASTDATA_HANDLER_SIZE - 8,15),
+ MIPS32_LW(10,MIPS32_FASTDATA_HANDLER_SIZE - 12,15),
+ MIPS32_LW(11,MIPS32_FASTDATA_HANDLER_SIZE - 16,15),
+
+ MIPS32_LUI(15,UPPER16(MIPS32_PRACC_TEXT)),
+ MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_TEXT)),
+ MIPS32_JR(15), /* jr start */
+ MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
+ MIPS32_NOP,
+ };
+
+ uint32_t jmp_code[] = {
+ MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
+ /* 1 */ MIPS32_LUI(15,0), /* addr of working area added below */
+ /* 2 */ MIPS32_ORI(15,15,0), /* addr of working area added below */
+ MIPS32_JR(15), /* jump to ram program */
+ MIPS32_NOP,
+ };
+
+#define JMP_CODE_SIZE (sizeof(jmp_code)/sizeof(jmp_code[0]))
+#define HANDLER_CODE_SIZE sizeof(handler_code)/sizeof(handler_code[0])
+
+ int retval, i;
+ uint32_t val, ejtag_ctrl, address;
+
+ if (source->size < MIPS32_FASTDATA_HANDLER_SIZE)
+ return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+
+ if (write)
+ {
+ handler_code[8] = MIPS32_LW(11,0,8); /* load data from probe at fastdata area */
+ handler_code[9] = MIPS32_SW(11,0,9); /* store data to RAM @ r9 */
+ }
+ else
+ {
+ handler_code[8] = MIPS32_LW(11,0,9); /* load data from RAM @ r9 */
+ handler_code[9] = MIPS32_SW(11,0,8); /* store data to probe at fastdata area */
+ }
+
+ /* write program into RAM */
+ mips32_pracc_write_mem32(ejtag_info, source->address, HANDLER_CODE_SIZE, handler_code);
+
+ /* quick verify RAM is working */
+ mips32_pracc_read_u32(ejtag_info, source->address, &val);
+ if (val != handler_code[0])
+ {
+ LOG_ERROR("fastdata handler verify failed\n");
+ return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+ }
+
+ LOG_INFO("%s using 0x%.8x for write handler\n", __func__, source->address);
+
+ jmp_code[1] |= UPPER16(source->address);
+ jmp_code[2] |= LOWER16(source->address);
+
+ for (i = 0; i < (int) JMP_CODE_SIZE; i++)
+ {
+ if ((retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl)) != ERROR_OK)
+ return retval;
+
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_DATA, NULL);
+ mips_ejtag_drscan_32(ejtag_info, &jmp_code[i]);
+
+ /* Clear the access pending bit (let the processor eat!) */
+
+ ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_PRACC;
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
+ mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
+ }
+
+ if ((retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl)) != ERROR_OK)
+ return retval;
+
+ /* next fetch to dmseg should be in FASTDATA_AREA, check */
+ address = 0;
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
+ mips_ejtag_drscan_32(ejtag_info, &address);
+
+ if (address != MIPS32_PRACC_FASTDATA_AREA)
+ return ERROR_FAIL;
+
+ /* Send the load start address */
+ val = addr;
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_FASTDATA, NULL);
+ mips_ejtag_fastdata_scan(ejtag_info, 1, &val);
+
+ /* Send the load end address */
+ val = addr + (count - 1) * 4;
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_FASTDATA, NULL);
+ mips_ejtag_fastdata_scan(ejtag_info, 1, &val);
+
+ for (i = 0; i < count; i++)
+ {
+ /* Send the data out using fastdata (clears the access pending bit) */
+ if ((retval = mips_ejtag_fastdata_scan(ejtag_info, write, buf++)) != ERROR_OK)
+ return retval;
+ }
+
+ if ((retval = jtag_execute_queue()) != ERROR_OK)
+ {
+ LOG_ERROR("fastdata load failed");
+ return retval;
+ }
+
+ if ((retval = wait_for_pracc_rw(ejtag_info, &ejtag_ctrl)) != ERROR_OK)
+ return retval;
+
+ address = 0;
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_ADDRESS, NULL);
+ mips_ejtag_drscan_32(ejtag_info, &address);
+
+ if (address != MIPS32_PRACC_TEXT)
+ LOG_ERROR("mini program did not return to start\n");
+
+ return retval;
+}
Code Review / openocd.git / blobdiff