2 * Copyright (C) 2009 by Marvell Semiconductors, Inc.
3 * Written by Nicolas Pitre <nico at marvell.com>
5 * Copyright (C) 2009 by David Brownell
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the
19 * Free Software Foundation, Inc.,
20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include "arm_nandio.h"
29 #include "algorithm.h"
32 * Copies code to a working area. This will allocate room for the code plus the
33 * additional amount requested if the working area pointer is null.
35 * @param target Pointer to the target to copy code to
36 * @param code Pointer to the code area to be copied
37 * @param code_size Size of the code being copied
38 * @param additional Size of the additional area to be allocated in addition to
40 * @param area Pointer to a pointer to a working area to copy code to
41 * @return Success or failure of the operation
43 int arm_code_to_working_area(struct target
*target
, const uint32_t *code
, unsigned code_size
,
44 unsigned additional
, struct working_area
**area
)
46 uint8_t code_buf
[code_size
];
49 unsigned size
= code_size
+ additional
;
51 /* make sure we have a working area */
53 retval
= target_alloc_working_area(target
, size
, area
);
54 if (retval
!= ERROR_OK
) {
55 LOG_DEBUG("%s: no %d byte buffer", __FUNCTION__
, (int) size
);
56 return ERROR_NAND_NO_BUFFER
;
60 /* buffer code in target endianness */
61 for (i
= 0; i
< code_size
/ 4; i
++)
62 target_buffer_set_u32(target
, code_buf
+ i
* 4, code
[i
]);
64 /* copy code to work area */
65 retval
= target_write_memory(target
, (*area
)->address
,
66 4, code_size
/ 4, code_buf
);
72 * ARM-specific bulk write from buffer to address of 8-bit wide NAND.
73 * For now this only supports ARMv4 and ARMv5 cores.
75 * Enhancements to target_run_algorithm() could enable:
76 * - ARMv6 and ARMv7 cores in ARM mode
78 * Different code fragments could handle:
79 * - Thumb2 cores like Cortex-M (needs different byteswapping)
80 * - 16-bit wide data (needs different setup too)
82 int arm_nandwrite(struct arm_nand_data
*nand
, uint8_t *data
, int size
)
84 struct target
*target
= nand
->target
;
85 struct armv4_5_algorithm algo
;
86 struct arm
*armv4_5
= target
->arch_info
;
87 struct reg_param reg_params
[3];
93 * r0 NAND data address (byte wide)
97 static const uint32_t code
[] = {
98 0xe4d13001, /* s: ldrb r3, [r1], #1 */
99 0xe5c03000, /* strb r3, [r0] */
100 0xe2522001, /* subs r2, r2, #1 */
101 0x1afffffb, /* bne s */
103 /* exit: ARMv4 needs hardware breakpoint */
104 0xe1200070, /* e: bkpt #0 */
107 if (!nand
->copy_area
) {
108 retval
= arm_code_to_working_area(target
, code
, sizeof(code
),
109 nand
->chunk_size
, &nand
->copy_area
);
110 if (retval
!= ERROR_OK
) {
115 /* copy data to work area */
116 target_buf
= nand
->copy_area
->address
+ sizeof(code
);
117 retval
= target_bulk_write_memory(target
, target_buf
, size
/ 4, data
);
118 if (retval
== ERROR_OK
&& (size
& 3) != 0)
119 retval
= target_write_memory(target
,
120 target_buf
+ (size
& ~3),
121 1, size
& 3, data
+ (size
& ~3));
122 if (retval
!= ERROR_OK
)
125 /* set up algorithm and parameters */
126 algo
.common_magic
= ARMV4_5_COMMON_MAGIC
;
127 algo
.core_mode
= ARMV4_5_MODE_SVC
;
128 algo
.core_state
= ARMV4_5_STATE_ARM
;
130 init_reg_param(®_params
[0], "r0", 32, PARAM_IN
);
131 init_reg_param(®_params
[1], "r1", 32, PARAM_IN
);
132 init_reg_param(®_params
[2], "r2", 32, PARAM_IN
);
134 buf_set_u32(reg_params
[0].value
, 0, 32, nand
->data
);
135 buf_set_u32(reg_params
[1].value
, 0, 32, target_buf
);
136 buf_set_u32(reg_params
[2].value
, 0, 32, size
);
138 /* armv4 must exit using a hardware breakpoint */
139 if (armv4_5
->is_armv4
)
140 exit
= nand
->copy_area
->address
+ sizeof(code
) - 4;
142 /* use alg to write data from work area to NAND chip */
143 retval
= target_run_algorithm(target
, 0, NULL
, 3, reg_params
,
144 nand
->copy_area
->address
, exit
, 1000, &algo
);
145 if (retval
!= ERROR_OK
)
146 LOG_ERROR("error executing hosted NAND write");
148 destroy_reg_param(®_params
[0]);
149 destroy_reg_param(®_params
[1]);
150 destroy_reg_param(®_params
[2]);
156 * Uses an on-chip algorithm for an ARM device to read from a NAND device and
157 * store the data into the host machine's memory.
159 * @param nand Pointer to the arm_nand_data struct that defines the I/O
160 * @param data Pointer to the data buffer to store the read data
161 * @param size Amount of data to be stored to the buffer.
163 int arm_nandread(struct arm_nand_data
*nand
, uint8_t *data
, uint32_t size
)
165 struct target
*target
= nand
->target
;
166 struct armv4_5_algorithm algo
;
167 struct arm
*armv4_5
= target
->arch_info
;
168 struct reg_param reg_params
[3];
175 * r1 NAND data address (byte wide)
178 static const uint32_t code
[] = {
179 0xe5d13000, /* s: ldrb r3, [r1] */
180 0xe4c03001, /* strb r3, [r0], #1 */
181 0xe2522001, /* subs r2, r2, #1 */
182 0x1afffffb, /* bne s */
184 /* exit: ARMv4 needs hardware breakpoint */
185 0xe1200070, /* e: bkpt #0 */
188 /* create the copy area if not yet available */
189 if (!nand
->copy_area
) {
190 retval
= arm_code_to_working_area(target
, code
, sizeof(code
),
191 nand
->chunk_size
, &nand
->copy_area
);
192 if (retval
!= ERROR_OK
) {
197 target_buf
= nand
->copy_area
->address
+ sizeof(code
);
199 /* set up algorithm and parameters */
200 algo
.common_magic
= ARMV4_5_COMMON_MAGIC
;
201 algo
.core_mode
= ARMV4_5_MODE_SVC
;
202 algo
.core_state
= ARMV4_5_STATE_ARM
;
204 init_reg_param(®_params
[0], "r0", 32, PARAM_IN
);
205 init_reg_param(®_params
[1], "r1", 32, PARAM_IN
);
206 init_reg_param(®_params
[2], "r2", 32, PARAM_IN
);
208 buf_set_u32(reg_params
[0].value
, 0, 32, target_buf
);
209 buf_set_u32(reg_params
[1].value
, 0, 32, nand
->data
);
210 buf_set_u32(reg_params
[2].value
, 0, 32, size
);
212 /* armv4 must exit using a hardware breakpoint */
213 if (armv4_5
->is_armv4
)
214 exit
= nand
->copy_area
->address
+ sizeof(code
) - 4;
216 /* use alg to write data from NAND chip to work area */
217 retval
= target_run_algorithm(target
, 0, NULL
, 3, reg_params
,
218 nand
->copy_area
->address
, exit
, 1000, &algo
);
219 if (retval
!= ERROR_OK
)
220 LOG_ERROR("error executing hosted NAND write");
222 destroy_reg_param(®_params
[0]);
223 destroy_reg_param(®_params
[1]);
224 destroy_reg_param(®_params
[2]);
226 /* read from work area to the host's memory */
227 retval
= target_read_buffer(target
, target_buf
, size
, data
);