summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/fsl_ifc_spl.c
blob: 4e49a4e15465a762b1d08bd5f8ebe579954b9973 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
/*
 * NAND boot for Freescale Integrated Flash Controller, NAND FCM
 *
 * Copyright 2011 Freescale Semiconductor, Inc.
 * Author: Dipen Dudhat <dipen.dudhat@freescale.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <fsl_ifc.h>
#include <linux/mtd/nand.h>
#ifdef CONFIG_CHAIN_OF_TRUST
#include <fsl_validate.h>
#endif

static inline int is_blank(uchar *addr, int page_size)
{
	int i;

	for (i = 0; i < page_size; i++) {
		if (__raw_readb(&addr[i]) != 0xff)
			return 0;
	}

	/*
	 * For the SPL, don't worry about uncorrectable errors
	 * where the main area is all FFs but shouldn't be.
	 */
	return 1;
}

/* returns nonzero if entire page is blank */
static inline int check_read_ecc(uchar *buf, u32 *eccstat,
				 unsigned int bufnum, int page_size)
{
	u32 reg = eccstat[bufnum / 4];
	int errors = (reg >> ((3 - bufnum % 4) * 8)) & 0xf;

	if (errors == 0xf) { /* uncorrectable */
		/* Blank pages fail hw ECC checks */
		if (is_blank(buf, page_size))
			return 1;

		puts("ecc error\n");
		for (;;)
			;
	}

	return 0;
}

static inline struct fsl_ifc_runtime *runtime_regs_address(void)
{
	struct fsl_ifc regs = {(void *)CONFIG_SYS_IFC_ADDR, NULL};
	int ver = 0;

	ver = ifc_in32(&regs.gregs->ifc_rev);
	if (ver >= FSL_IFC_V2_0_0)
		regs.rregs = (void *)CONFIG_SYS_IFC_ADDR + IFC_RREGS_64KOFFSET;
	else
		regs.rregs = (void *)CONFIG_SYS_IFC_ADDR + IFC_RREGS_4KOFFSET;

	return regs.rregs;
}

static inline void nand_wait(uchar *buf, int bufnum, int page_size)
{
	struct fsl_ifc_runtime *ifc = runtime_regs_address();
	u32 status;
	u32 eccstat[8];
	int bufperpage = page_size / 512;
	int bufnum_end, i;

	bufnum *= bufperpage;
	bufnum_end = bufnum + bufperpage - 1;

	do {
		status = ifc_in32(&ifc->ifc_nand.nand_evter_stat);
	} while (!(status & IFC_NAND_EVTER_STAT_OPC));

	if (status & IFC_NAND_EVTER_STAT_FTOER) {
		puts("flash time out error\n");
		for (;;)
			;
	}

	for (i = bufnum / 4; i <= bufnum_end / 4; i++)
		eccstat[i] = ifc_in32(&ifc->ifc_nand.nand_eccstat[i]);

	for (i = bufnum; i <= bufnum_end; i++) {
		if (check_read_ecc(buf, eccstat, i, page_size))
			break;
	}

	ifc_out32(&ifc->ifc_nand.nand_evter_stat, status);
}

static inline int bad_block(uchar *marker, int port_size)
{
	if (port_size == 8)
		return __raw_readb(marker) != 0xff;
	else
		return __raw_readw((u16 *)marker) != 0xffff;
}

int nand_spl_load_image(uint32_t offs, unsigned int uboot_size, void *vdst)
{
	struct fsl_ifc_fcm *gregs = (void *)CONFIG_SYS_IFC_ADDR;
	struct fsl_ifc_runtime *ifc = NULL;
	uchar *buf = (uchar *)CONFIG_SYS_NAND_BASE;
	int page_size;
	int port_size;
	int pages_per_blk;
	int blk_size;
	int bad_marker = 0;
	int bufnum_mask, bufnum, ver = 0;

	int csor, cspr;
	int pos = 0;
	int j = 0;

	int sram_addr;
	int pg_no;
	uchar *dst = vdst;

	ifc = runtime_regs_address();

	/* Get NAND Flash configuration */
	csor = CONFIG_SYS_NAND_CSOR;
	cspr = CONFIG_SYS_NAND_CSPR;

	port_size = (cspr & CSPR_PORT_SIZE_16) ? 16 : 8;

	if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_8K) {
		page_size = 8192;
		bufnum_mask = 0x0;
	} else if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_4K) {
		page_size = 4096;
		bufnum_mask = 0x1;
	} else if ((csor & CSOR_NAND_PGS_MASK) == CSOR_NAND_PGS_2K) {
		page_size = 2048;
		bufnum_mask = 0x3;
	} else {
		page_size = 512;
		bufnum_mask = 0xf;

		if (port_size == 8)
			bad_marker = 5;
	}

	ver = ifc_in32(&gregs->ifc_rev);
	if (ver >= FSL_IFC_V2_0_0)
		bufnum_mask = (bufnum_mask * 2) + 1;

	pages_per_blk =
		32 << ((csor & CSOR_NAND_PB_MASK) >> CSOR_NAND_PB_SHIFT);

	blk_size = pages_per_blk * page_size;

	/* Open Full SRAM mapping for spare are access */
	ifc_out32(&ifc->ifc_nand.ncfgr, 0x0);

	/* Clear Boot events */
	ifc_out32(&ifc->ifc_nand.nand_evter_stat, 0xffffffff);

	/* Program FIR/FCR for Large/Small page */
	if (page_size > 512) {
		ifc_out32(&ifc->ifc_nand.nand_fir0,
			  (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
			  (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
			  (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
			  (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
			  (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP4_SHIFT));
		ifc_out32(&ifc->ifc_nand.nand_fir1, 0x0);

		ifc_out32(&ifc->ifc_nand.nand_fcr0,
			  (NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
			  (NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT));
	} else {
		ifc_out32(&ifc->ifc_nand.nand_fir0,
			  (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
			  (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
			  (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
			  (IFC_FIR_OP_BTRD << IFC_NAND_FIR0_OP3_SHIFT));
		ifc_out32(&ifc->ifc_nand.nand_fir1, 0x0);

		ifc_out32(&ifc->ifc_nand.nand_fcr0,
			  NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT);
	}

	/* Program FBCR = 0 for full page read */
	ifc_out32(&ifc->ifc_nand.nand_fbcr, 0);

	/* Read and copy u-boot on SDRAM from NAND device, In parallel
	 * check for Bad block if found skip it and read continue to
	 * next Block
	 */
	while (pos < uboot_size) {
		int i = 0;
		do {
			pg_no = offs / page_size;
			bufnum = pg_no & bufnum_mask;
			sram_addr = bufnum * page_size * 2;

			ifc_out32(&ifc->ifc_nand.row0, pg_no);
			ifc_out32(&ifc->ifc_nand.col0, 0);
			/* start read */
			ifc_out32(&ifc->ifc_nand.nandseq_strt,
				  IFC_NAND_SEQ_STRT_FIR_STRT);

			/* wait for read to complete */
			nand_wait(&buf[sram_addr], bufnum, page_size);

			/*
			 * If either of the first two pages are marked bad,
			 * continue to the next block.
			 */
			if (i++ < 2 &&
			    bad_block(&buf[sram_addr + page_size + bad_marker],
				      port_size)) {
				puts("skipping\n");
				offs = (offs + blk_size) & ~(blk_size - 1);
				pos &= ~(blk_size - 1);
				break;
			}

			for (j = 0; j < page_size; j++)
				dst[pos + j] = __raw_readb(&buf[sram_addr + j]);

			pos += page_size;
			offs += page_size;
		} while ((offs & (blk_size - 1)) && (pos < uboot_size));
	}

	return 0;
}

/*
 * Main entrypoint for NAND Boot. It's necessary that SDRAM is already
 * configured and available since this code loads the main U-Boot image
 * from NAND into SDRAM and starts from there.
 */
void nand_boot(void)
{
	__attribute__((noreturn)) void (*uboot)(void);
	/*
	 * Load U-Boot image from NAND into RAM
	 */
	nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
			    CONFIG_SYS_NAND_U_BOOT_SIZE,
			    (uchar *)CONFIG_SYS_NAND_U_BOOT_DST);

#ifdef CONFIG_NAND_ENV_DST
	nand_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
			    (uchar *)CONFIG_NAND_ENV_DST);

#ifdef CONFIG_ENV_OFFSET_REDUND
	nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, CONFIG_ENV_SIZE,
			    (uchar *)CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE);
#endif
#endif
	/*
	 * Jump to U-Boot image
	 */
#ifdef CONFIG_SPL_FLUSH_IMAGE
	/*
	 * Clean d-cache and invalidate i-cache, to
	 * make sure that no stale data is executed.
	 */
	flush_cache(CONFIG_SYS_NAND_U_BOOT_DST, CONFIG_SYS_NAND_U_BOOT_SIZE);
#endif

#ifdef CONFIG_CHAIN_OF_TRUST
	/*
	 * U-Boot header is appended at end of U-boot image, so
	 * calculate U-boot header address using U-boot header size.
	 */
#define CONFIG_U_BOOT_HDR_ADDR \
		((CONFIG_SYS_NAND_U_BOOT_START + \
		  CONFIG_SYS_NAND_U_BOOT_SIZE) - \
		 CONFIG_U_BOOT_HDR_SIZE)
	spl_validate_uboot(CONFIG_U_BOOT_HDR_ADDR,
			   CONFIG_SYS_NAND_U_BOOT_START);
	/*
	 * In case of failure in validation, spl_validate_uboot would
	 * not return back in case of Production environment with ITS=1.
	 * Thus U-Boot will not start.
	 * In Development environment (ITS=0 and SB_EN=1), the function
	 * may return back in case of non-fatal failures.
	 */
#endif

	uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START;
	uboot();
}

#ifndef CONFIG_SPL_NAND_INIT
void nand_init(void)
{
}

void nand_deselect(void)
{
}
#endif