1 /*
2  * Broadcom specific AMBA
3  * ChipCommon serial flash interface
4  *
5  * Licensed under the GNU/GPL. See COPYING for details.
6  */
7 
8 #include "bcma_private.h"
9 
10 #include <linux/platform_device.h>
11 #include <linux/bcma/bcma.h>
12 
13 static struct resource bcma_sflash_resource = {
14 	.name	= "bcma_sflash",
15 	.start	= BCMA_SOC_FLASH2,
16 	.end	= 0,
17 	.flags  = IORESOURCE_MEM | IORESOURCE_READONLY,
18 };
19 
20 struct platform_device bcma_sflash_dev = {
21 	.name		= "bcma_sflash",
22 	.resource	= &bcma_sflash_resource,
23 	.num_resources	= 1,
24 };
25 
26 struct bcma_sflash_tbl_e {
27 	char *name;
28 	u32 id;
29 	u32 blocksize;
30 	u16 numblocks;
31 };
32 
33 static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
34 	{ "M25P20", 0x11, 0x10000, 4, },
35 	{ "M25P40", 0x12, 0x10000, 8, },
36 
37 	{ "M25P16", 0x14, 0x10000, 32, },
38 	{ "M25P32", 0x15, 0x10000, 64, },
39 	{ "M25P64", 0x16, 0x10000, 128, },
40 	{ "M25FL128", 0x17, 0x10000, 256, },
41 	{ 0 },
42 };
43 
44 static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
45 	{ "SST25WF512", 1, 0x1000, 16, },
46 	{ "SST25VF512", 0x48, 0x1000, 16, },
47 	{ "SST25WF010", 2, 0x1000, 32, },
48 	{ "SST25VF010", 0x49, 0x1000, 32, },
49 	{ "SST25WF020", 3, 0x1000, 64, },
50 	{ "SST25VF020", 0x43, 0x1000, 64, },
51 	{ "SST25WF040", 4, 0x1000, 128, },
52 	{ "SST25VF040", 0x44, 0x1000, 128, },
53 	{ "SST25VF040B", 0x8d, 0x1000, 128, },
54 	{ "SST25WF080", 5, 0x1000, 256, },
55 	{ "SST25VF080B", 0x8e, 0x1000, 256, },
56 	{ "SST25VF016", 0x41, 0x1000, 512, },
57 	{ "SST25VF032", 0x4a, 0x1000, 1024, },
58 	{ "SST25VF064", 0x4b, 0x1000, 2048, },
59 	{ 0 },
60 };
61 
62 static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
63 	{ "AT45DB011", 0xc, 256, 512, },
64 	{ "AT45DB021", 0x14, 256, 1024, },
65 	{ "AT45DB041", 0x1c, 256, 2048, },
66 	{ "AT45DB081", 0x24, 256, 4096, },
67 	{ "AT45DB161", 0x2c, 512, 4096, },
68 	{ "AT45DB321", 0x34, 512, 8192, },
69 	{ "AT45DB642", 0x3c, 1024, 8192, },
70 	{ 0 },
71 };
72 
73 static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
74 {
75 	int i;
76 	bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
77 			BCMA_CC_FLASHCTL_START | opcode);
78 	for (i = 0; i < 1000; i++) {
79 		if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
80 		      BCMA_CC_FLASHCTL_BUSY))
81 			return;
82 		cpu_relax();
83 	}
84 	bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
85 }
86 
87 /* Initialize serial flash access */
88 int bcma_sflash_init(struct bcma_drv_cc *cc)
89 {
90 	struct bcma_bus *bus = cc->core->bus;
91 	struct bcma_sflash *sflash = &cc->sflash;
92 	const struct bcma_sflash_tbl_e *e;
93 	u32 id, id2;
94 
95 	switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
96 	case BCMA_CC_FLASHT_STSER:
97 		bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
98 
99 		bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
100 		bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
101 		id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
102 
103 		bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
104 		bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
105 		id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
106 
107 		switch (id) {
108 		case 0xbf:
109 			for (e = bcma_sflash_sst_tbl; e->name; e++) {
110 				if (e->id == id2)
111 					break;
112 			}
113 			break;
114 		case 0x13:
115 			return -ENOTSUPP;
116 		default:
117 			for (e = bcma_sflash_st_tbl; e->name; e++) {
118 				if (e->id == id)
119 					break;
120 			}
121 			break;
122 		}
123 		if (!e->name) {
124 			bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
125 			return -ENOTSUPP;
126 		}
127 
128 		break;
129 	case BCMA_CC_FLASHT_ATSER:
130 		bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
131 		id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
132 
133 		for (e = bcma_sflash_at_tbl; e->name; e++) {
134 			if (e->id == id)
135 				break;
136 		}
137 		if (!e->name) {
138 			bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
139 			return -ENOTSUPP;
140 		}
141 
142 		break;
143 	default:
144 		bcma_err(bus, "Unsupported flash type\n");
145 		return -ENOTSUPP;
146 	}
147 
148 	sflash->window = BCMA_SOC_FLASH2;
149 	sflash->blocksize = e->blocksize;
150 	sflash->numblocks = e->numblocks;
151 	sflash->size = sflash->blocksize * sflash->numblocks;
152 	sflash->present = true;
153 
154 	bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
155 		  e->name, sflash->size / 1024, sflash->blocksize,
156 		  sflash->numblocks);
157 
158 	/* Prepare platform device, but don't register it yet. It's too early,
159 	 * malloc (required by device_private_init) is not available yet. */
160 	bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
161 					  sflash->size;
162 	bcma_sflash_dev.dev.platform_data = sflash;
163 
164 	return 0;
165 }
166