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
13static 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
20struct platform_device bcma_sflash_dev = {
21	.name		= "bcma_sflash",
22	.resource	= &bcma_sflash_resource,
23	.num_resources	= 1,
24};
25
26struct bcma_sflash_tbl_e {
27	char *name;
28	u32 id;
29	u32 blocksize;
30	u16 numblocks;
31};
32
33static 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	{ NULL },
42};
43
44static 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	{ NULL },
60};
61
62static 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	{ NULL },
71};
72
73static 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 */
88int 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