mirror of https://gitee.com/openkylin/linux.git
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* Broadcom specific AMBA
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* ChipCommon serial flash interface
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/platform_device.h>
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#include <linux/bcma/bcma.h>
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#include "bcma_private.h"
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static struct resource bcma_sflash_resource = {
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.name = "bcma_sflash",
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.start = BCMA_SFLASH,
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.end = 0,
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.flags = IORESOURCE_MEM | IORESOURCE_READONLY,
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};
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struct platform_device bcma_sflash_dev = {
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.name = "bcma_sflash",
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.resource = &bcma_sflash_resource,
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.num_resources = 1,
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};
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struct bcma_sflash_tbl_e {
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char *name;
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u32 id;
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u32 blocksize;
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u16 numblocks;
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};
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static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
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{ "", 0x14, 0x10000, 32, },
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{ 0 },
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};
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static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
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{ 0 },
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};
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static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
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{ 0 },
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};
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static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
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{
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int i;
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bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
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BCMA_CC_FLASHCTL_START | opcode);
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for (i = 0; i < 1000; i++) {
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if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
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BCMA_CC_FLASHCTL_BUSY))
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return;
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cpu_relax();
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}
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bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
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}
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/* Initialize serial flash access */
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int bcma_sflash_init(struct bcma_drv_cc *cc)
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{
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struct bcma_bus *bus = cc->core->bus;
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struct bcma_sflash *sflash = &cc->sflash;
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struct bcma_sflash_tbl_e *e;
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u32 id, id2;
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switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
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case BCMA_CC_FLASHT_STSER:
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bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
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bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
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bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
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id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
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bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
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bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
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id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
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switch (id) {
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case 0xbf:
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for (e = bcma_sflash_sst_tbl; e->name; e++) {
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if (e->id == id2)
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break;
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}
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break;
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default:
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for (e = bcma_sflash_st_tbl; e->name; e++) {
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if (e->id == id)
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break;
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}
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break;
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}
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if (!e->name) {
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bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
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return -ENOTSUPP;
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}
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break;
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case BCMA_CC_FLASHT_ATSER:
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bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
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id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
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for (e = bcma_sflash_at_tbl; e->name; e++) {
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if (e->id == id)
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break;
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}
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if (!e->name) {
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bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
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return -ENOTSUPP;
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}
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break;
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default:
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bcma_err(bus, "Unsupported flash type\n");
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return -ENOTSUPP;
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}
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sflash->window = BCMA_SFLASH;
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sflash->blocksize = e->blocksize;
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sflash->numblocks = e->numblocks;
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sflash->size = sflash->blocksize * sflash->numblocks;
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sflash->present = true;
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bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
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e->name, sflash->size / 1024, sflash->blocksize,
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sflash->numblocks);
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/* Prepare platform device, but don't register it yet. It's too early,
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* malloc (required by device_private_init) is not available yet. */
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bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
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sflash->size;
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bcma_sflash_dev.dev.platform_data = sflash;
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return 0;
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}
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