1 /*
2  * Sonics Silicon Backplane
3  * ChipCommon serial flash interface
4  *
5  * Licensed under the GNU/GPL. See COPYING for details.
6  */
7 
8 #include <linux/ssb/ssb.h>
9 
10 #include "ssb_private.h"
11 
12 struct ssb_sflash_tbl_e {
13 	char *name;
14 	u32 id;
15 	u32 blocksize;
16 	u16 numblocks;
17 };
18 
19 static struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
20 	{ "M25P20", 0x11, 0x10000, 4, },
21 	{ "M25P40", 0x12, 0x10000, 8, },
22 
23 	{ "M25P16", 0x14, 0x10000, 32, },
24 	{ "M25P32", 0x15, 0x10000, 64, },
25 	{ "M25P64", 0x16, 0x10000, 128, },
26 	{ "M25FL128", 0x17, 0x10000, 256, },
27 	{ 0 },
28 };
29 
30 static struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
31 	{ "SST25WF512", 1, 0x1000, 16, },
32 	{ "SST25VF512", 0x48, 0x1000, 16, },
33 	{ "SST25WF010", 2, 0x1000, 32, },
34 	{ "SST25VF010", 0x49, 0x1000, 32, },
35 	{ "SST25WF020", 3, 0x1000, 64, },
36 	{ "SST25VF020", 0x43, 0x1000, 64, },
37 	{ "SST25WF040", 4, 0x1000, 128, },
38 	{ "SST25VF040", 0x44, 0x1000, 128, },
39 	{ "SST25VF040B", 0x8d, 0x1000, 128, },
40 	{ "SST25WF080", 5, 0x1000, 256, },
41 	{ "SST25VF080B", 0x8e, 0x1000, 256, },
42 	{ "SST25VF016", 0x41, 0x1000, 512, },
43 	{ "SST25VF032", 0x4a, 0x1000, 1024, },
44 	{ "SST25VF064", 0x4b, 0x1000, 2048, },
45 	{ 0 },
46 };
47 
48 static struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
49 	{ "AT45DB011", 0xc, 256, 512, },
50 	{ "AT45DB021", 0x14, 256, 1024, },
51 	{ "AT45DB041", 0x1c, 256, 2048, },
52 	{ "AT45DB081", 0x24, 256, 4096, },
53 	{ "AT45DB161", 0x2c, 512, 4096, },
54 	{ "AT45DB321", 0x34, 512, 8192, },
55 	{ "AT45DB642", 0x3c, 1024, 8192, },
56 	{ 0 },
57 };
58 
59 static void ssb_sflash_cmd(struct ssb_chipcommon *cc, u32 opcode)
60 {
61 	int i;
62 	chipco_write32(cc, SSB_CHIPCO_FLASHCTL,
63 		       SSB_CHIPCO_FLASHCTL_START | opcode);
64 	for (i = 0; i < 1000; i++) {
65 		if (!(chipco_read32(cc, SSB_CHIPCO_FLASHCTL) &
66 		      SSB_CHIPCO_FLASHCTL_BUSY))
67 			return;
68 		cpu_relax();
69 	}
70 	pr_err("SFLASH control command failed (timeout)!\n");
71 }
72 
73 /* Initialize serial flash access */
74 int ssb_sflash_init(struct ssb_chipcommon *cc)
75 {
76 	struct ssb_sflash_tbl_e *e;
77 	u32 id, id2;
78 
79 	switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) {
80 	case SSB_CHIPCO_FLASHT_STSER:
81 		ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_DP);
82 
83 		chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 0);
84 		ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
85 		id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
86 
87 		chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 1);
88 		ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
89 		id2 = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
90 
91 		switch (id) {
92 		case 0xbf:
93 			for (e = ssb_sflash_sst_tbl; e->name; e++) {
94 				if (e->id == id2)
95 					break;
96 			}
97 			break;
98 		case 0x13:
99 			return -ENOTSUPP;
100 		default:
101 			for (e = ssb_sflash_st_tbl; e->name; e++) {
102 				if (e->id == id)
103 					break;
104 			}
105 			break;
106 		}
107 		if (!e->name) {
108 			pr_err("Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n",
109 			       id, id2);
110 			return -ENOTSUPP;
111 		}
112 
113 		break;
114 	case SSB_CHIPCO_FLASHT_ATSER:
115 		ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_AT_STATUS);
116 		id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA) & 0x3c;
117 
118 		for (e = ssb_sflash_at_tbl; e->name; e++) {
119 			if (e->id == id)
120 				break;
121 		}
122 		if (!e->name) {
123 			pr_err("Unsupported Atmel serial flash (id: 0x%X)\n",
124 			       id);
125 			return -ENOTSUPP;
126 		}
127 
128 		break;
129 	default:
130 		pr_err("Unsupported flash type\n");
131 		return -ENOTSUPP;
132 	}
133 
134 	pr_info("Found %s serial flash (blocksize: 0x%X, blocks: %d)\n",
135 		e->name, e->blocksize, e->numblocks);
136 
137 	pr_err("Serial flash support is not implemented yet!\n");
138 
139 	return -ENOTSUPP;
140 }
141