xref: /openbmc/u-boot/drivers/misc/fsl_iim.c (revision f9727161) 
1 /*
2  * (C) Copyright 2009-2013 ADVANSEE
3  * Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
4  *
5  * Based on the mpc512x iim code:
6  * Copyright 2008 Silicon Turnkey Express, Inc.
7  * Martha Marx <mmarx@silicontkx.com>
8  *
9  * SPDX-License-Identifier:	GPL-2.0+
10  */
11 
12 #include <common.h>
13 #include <fuse.h>
14 #include <asm/errno.h>
15 #include <asm/io.h>
16 #ifndef CONFIG_MPC512X
17 #include <asm/arch/imx-regs.h>
18 #endif
19 
20 /* FSL IIM-specific constants */
21 #define STAT_BUSY		0x80
22 #define STAT_PRGD		0x02
23 #define STAT_SNSD		0x01
24 
25 #define STATM_PRGD_M		0x02
26 #define STATM_SNSD_M		0x01
27 
28 #define ERR_PRGE		0x80
29 #define ERR_WPE			0x40
30 #define ERR_OPE			0x20
31 #define ERR_RPE			0x10
32 #define ERR_WLRE		0x08
33 #define ERR_SNSE		0x04
34 #define ERR_PARITYE		0x02
35 
36 #define EMASK_PRGE_M		0x80
37 #define EMASK_WPE_M		0x40
38 #define EMASK_OPE_M		0x20
39 #define EMASK_RPE_M		0x10
40 #define EMASK_WLRE_M		0x08
41 #define EMASK_SNSE_M		0x04
42 #define EMASK_PARITYE_M		0x02
43 
44 #define FCTL_DPC		0x80
45 #define FCTL_PRG_LENGTH_MASK	0x70
46 #define FCTL_ESNS_N		0x08
47 #define FCTL_ESNS_0		0x04
48 #define FCTL_ESNS_1		0x02
49 #define FCTL_PRG		0x01
50 
51 #define UA_A_BANK_MASK		0x38
52 #define UA_A_ROWH_MASK		0x07
53 
54 #define LA_A_ROWL_MASK		0xf8
55 #define LA_A_BIT_MASK		0x07
56 
57 #define PREV_PROD_REV_MASK	0xf8
58 #define PREV_PROD_VT_MASK	0x07
59 
60 /* Select the correct accessors depending on endianness */
61 #if __BYTE_ORDER == __LITTLE_ENDIAN
62 #define iim_read32		in_le32
63 #define iim_write32		out_le32
64 #define iim_clrsetbits32	clrsetbits_le32
65 #define iim_clrbits32		clrbits_le32
66 #define iim_setbits32		setbits_le32
67 #elif __BYTE_ORDER == __BIG_ENDIAN
68 #define iim_read32		in_be32
69 #define iim_write32		out_be32
70 #define iim_clrsetbits32	clrsetbits_be32
71 #define iim_clrbits32		clrbits_be32
72 #define iim_setbits32		setbits_be32
73 #else
74 #error Endianess is not defined: please fix to continue
75 #endif
76 
77 /* IIM control registers */
78 struct fsl_iim {
79 	u32 stat;
80 	u32 statm;
81 	u32 err;
82 	u32 emask;
83 	u32 fctl;
84 	u32 ua;
85 	u32 la;
86 	u32 sdat;
87 	u32 prev;
88 	u32 srev;
89 	u32 prg_p;
90 	u32 scs[0x1f5];
91 	struct {
92 		u32 word[0x100];
93 	} bank[8];
94 };
95 
96 static int prepare_access(struct fsl_iim **regs, u32 bank, u32 word, int assert,
97 				const char *caller)
98 {
99 	*regs = (struct fsl_iim *)IIM_BASE_ADDR;
100 
101 	if (bank >= ARRAY_SIZE((*regs)->bank) ||
102 			word >= ARRAY_SIZE((*regs)->bank[0].word) ||
103 			!assert) {
104 		printf("fsl_iim %s(): Invalid argument\n", caller);
105 		return -EINVAL;
106 	}
107 
108 	return 0;
109 }
110 
111 static void clear_status(struct fsl_iim *regs)
112 {
113 	iim_setbits32(&regs->stat, 0);
114 	iim_setbits32(&regs->err, 0);
115 }
116 
117 static void finish_access(struct fsl_iim *regs, u32 *stat, u32 *err)
118 {
119 	*stat = iim_read32(&regs->stat);
120 	*err = iim_read32(&regs->err);
121 	clear_status(regs);
122 }
123 
124 static int prepare_read(struct fsl_iim **regs, u32 bank, u32 word, u32 *val,
125 			const char *caller)
126 {
127 	int ret;
128 
129 	ret = prepare_access(regs, bank, word, val != NULL, caller);
130 	if (ret)
131 		return ret;
132 
133 	clear_status(*regs);
134 
135 	return 0;
136 }
137 
138 int fuse_read(u32 bank, u32 word, u32 *val)
139 {
140 	struct fsl_iim *regs;
141 	u32 stat, err;
142 	int ret;
143 
144 	ret = prepare_read(&regs, bank, word, val, __func__);
145 	if (ret)
146 		return ret;
147 
148 	*val = iim_read32(&regs->bank[bank].word[word]);
149 	finish_access(regs, &stat, &err);
150 
151 	if (err & ERR_RPE) {
152 		puts("fsl_iim fuse_read(): Read protect error\n");
153 		return -EIO;
154 	}
155 
156 	return 0;
157 }
158 
159 static void direct_access(struct fsl_iim *regs, u32 bank, u32 word, u32 bit,
160 				u32 fctl, u32 *stat, u32 *err)
161 {
162 	iim_write32(&regs->ua, bank << 3 | word >> 5);
163 	iim_write32(&regs->la, (word << 3 | bit) & 0xff);
164 	if (fctl == FCTL_PRG)
165 		iim_write32(&regs->prg_p, 0xaa);
166 	iim_setbits32(&regs->fctl, fctl);
167 	while (iim_read32(&regs->stat) & STAT_BUSY)
168 		udelay(20);
169 	finish_access(regs, stat, err);
170 }
171 
172 int fuse_sense(u32 bank, u32 word, u32 *val)
173 {
174 	struct fsl_iim *regs;
175 	u32 stat, err;
176 	int ret;
177 
178 	ret = prepare_read(&regs, bank, word, val, __func__);
179 	if (ret)
180 		return ret;
181 
182 	direct_access(regs, bank, word, 0, FCTL_ESNS_N, &stat, &err);
183 
184 	if (err & ERR_SNSE) {
185 		puts("fsl_iim fuse_sense(): Explicit sense cycle error\n");
186 		return -EIO;
187 	}
188 
189 	if (!(stat & STAT_SNSD)) {
190 		puts("fsl_iim fuse_sense(): Explicit sense cycle did not complete\n");
191 		return -EIO;
192 	}
193 
194 	*val = iim_read32(&regs->sdat);
195 	return 0;
196 }
197 
198 static int prog_bit(struct fsl_iim *regs, u32 bank, u32 word, u32 bit)
199 {
200 	u32 stat, err;
201 
202 	clear_status(regs);
203 	direct_access(regs, bank, word, bit, FCTL_PRG, &stat, &err);
204 	iim_write32(&regs->prg_p, 0x00);
205 
206 	if (err & ERR_PRGE) {
207 		puts("fsl_iim fuse_prog(): Program error\n");
208 		return -EIO;
209 	}
210 
211 	if (err & ERR_WPE) {
212 		puts("fsl_iim fuse_prog(): Write protect error\n");
213 		return -EIO;
214 	}
215 
216 	if (!(stat & STAT_PRGD)) {
217 		puts("fsl_iim fuse_prog(): Program did not complete\n");
218 		return -EIO;
219 	}
220 
221 	return 0;
222 }
223 
224 static int prepare_write(struct fsl_iim **regs, u32 bank, u32 word, u32 val,
225 				const char *caller)
226 {
227 	return prepare_access(regs, bank, word, !(val & ~0xff), caller);
228 }
229 
230 int fuse_prog(u32 bank, u32 word, u32 val)
231 {
232 	struct fsl_iim *regs;
233 	u32 bit;
234 	int ret;
235 
236 	ret = prepare_write(&regs, bank, word, val, __func__);
237 	if (ret)
238 		return ret;
239 
240 	for (bit = 0; val; bit++, val >>= 1)
241 		if (val & 0x01) {
242 			ret = prog_bit(regs, bank, word, bit);
243 			if (ret)
244 				return ret;
245 		}
246 
247 	return 0;
248 }
249 
250 int fuse_override(u32 bank, u32 word, u32 val)
251 {
252 	struct fsl_iim *regs;
253 	u32 stat, err;
254 	int ret;
255 
256 	ret = prepare_write(&regs, bank, word, val, __func__);
257 	if (ret)
258 		return ret;
259 
260 	clear_status(regs);
261 	iim_write32(&regs->bank[bank].word[word], val);
262 	finish_access(regs, &stat, &err);
263 
264 	if (err & ERR_OPE) {
265 		puts("fsl_iim fuse_override(): Override protect error\n");
266 		return -EIO;
267 	}
268 
269 	return 0;
270 }
271