2 * Broadcom specific AMBA
3 * ChipCommon serial flash interface
5 * Licensed under the GNU/GPL. See COPYING for details.
8 #include <linux/platform_device.h>
9 #include <linux/bcma/bcma.h>
11 #include "bcma_private.h"
13 static struct resource bcma_sflash_resource = {
14 .name = "bcma_sflash",
17 .flags = IORESOURCE_MEM | IORESOURCE_READONLY,
20 struct platform_device bcma_sflash_dev = {
21 .name = "bcma_sflash",
22 .resource = &bcma_sflash_resource,
26 struct bcma_sflash_tbl_e {
33 static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
34 { "", 0x14, 0x10000, 32, },
38 static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
42 static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
46 static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
49 bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
50 BCMA_CC_FLASHCTL_START | opcode);
51 for (i = 0; i < 1000; i++) {
52 if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
53 BCMA_CC_FLASHCTL_BUSY))
57 bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
60 /* Initialize serial flash access */
61 int bcma_sflash_init(struct bcma_drv_cc *cc)
63 struct bcma_bus *bus = cc->core->bus;
64 struct bcma_sflash *sflash = &cc->sflash;
65 struct bcma_sflash_tbl_e *e;
68 switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
69 case BCMA_CC_FLASHT_STSER:
70 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
72 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
73 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
74 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
76 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
77 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
78 id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
82 for (e = bcma_sflash_sst_tbl; e->name; e++) {
88 for (e = bcma_sflash_st_tbl; e->name; e++) {
95 bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
100 case BCMA_CC_FLASHT_ATSER:
101 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
102 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
104 for (e = bcma_sflash_at_tbl; e->name; e++) {
109 bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
115 bcma_err(bus, "Unsupported flash type\n");
119 sflash->window = BCMA_SFLASH;
120 sflash->blocksize = e->blocksize;
121 sflash->numblocks = e->numblocks;
122 sflash->size = sflash->blocksize * sflash->numblocks;
123 sflash->present = true;
125 bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
126 e->name, sflash->size / 1024, sflash->blocksize,
129 /* Prepare platform device, but don't register it yet. It's too early,
130 * malloc (required by device_private_init) is not available yet. */
131 bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
133 bcma_sflash_dev.dev.platform_data = sflash;