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Diffstat (limited to 'kernel/drivers/ssb/driver_chipcommon_sflash.c')
-rw-r--r--kernel/drivers/ssb/driver_chipcommon_sflash.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/kernel/drivers/ssb/driver_chipcommon_sflash.c b/kernel/drivers/ssb/driver_chipcommon_sflash.c
new file mode 100644
index 000000000..937fc3197
--- /dev/null
+++ b/kernel/drivers/ssb/driver_chipcommon_sflash.c
@@ -0,0 +1,164 @@
+/*
+ * Sonics Silicon Backplane
+ * ChipCommon serial flash interface
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include <linux/ssb/ssb.h>
+
+#include "ssb_private.h"
+
+static struct resource ssb_sflash_resource = {
+ .name = "ssb_sflash",
+ .start = SSB_FLASH2,
+ .end = 0,
+ .flags = IORESOURCE_MEM | IORESOURCE_READONLY,
+};
+
+struct platform_device ssb_sflash_dev = {
+ .name = "ssb_sflash",
+ .resource = &ssb_sflash_resource,
+ .num_resources = 1,
+};
+
+struct ssb_sflash_tbl_e {
+ char *name;
+ u32 id;
+ u32 blocksize;
+ u16 numblocks;
+};
+
+static const struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
+ { "M25P20", 0x11, 0x10000, 4, },
+ { "M25P40", 0x12, 0x10000, 8, },
+
+ { "M25P16", 0x14, 0x10000, 32, },
+ { "M25P32", 0x15, 0x10000, 64, },
+ { "M25P64", 0x16, 0x10000, 128, },
+ { "M25FL128", 0x17, 0x10000, 256, },
+ { NULL },
+};
+
+static const struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
+ { "SST25WF512", 1, 0x1000, 16, },
+ { "SST25VF512", 0x48, 0x1000, 16, },
+ { "SST25WF010", 2, 0x1000, 32, },
+ { "SST25VF010", 0x49, 0x1000, 32, },
+ { "SST25WF020", 3, 0x1000, 64, },
+ { "SST25VF020", 0x43, 0x1000, 64, },
+ { "SST25WF040", 4, 0x1000, 128, },
+ { "SST25VF040", 0x44, 0x1000, 128, },
+ { "SST25VF040B", 0x8d, 0x1000, 128, },
+ { "SST25WF080", 5, 0x1000, 256, },
+ { "SST25VF080B", 0x8e, 0x1000, 256, },
+ { "SST25VF016", 0x41, 0x1000, 512, },
+ { "SST25VF032", 0x4a, 0x1000, 1024, },
+ { "SST25VF064", 0x4b, 0x1000, 2048, },
+ { NULL },
+};
+
+static const struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
+ { "AT45DB011", 0xc, 256, 512, },
+ { "AT45DB021", 0x14, 256, 1024, },
+ { "AT45DB041", 0x1c, 256, 2048, },
+ { "AT45DB081", 0x24, 256, 4096, },
+ { "AT45DB161", 0x2c, 512, 4096, },
+ { "AT45DB321", 0x34, 512, 8192, },
+ { "AT45DB642", 0x3c, 1024, 8192, },
+ { NULL },
+};
+
+static void ssb_sflash_cmd(struct ssb_chipcommon *cc, u32 opcode)
+{
+ int i;
+ chipco_write32(cc, SSB_CHIPCO_FLASHCTL,
+ SSB_CHIPCO_FLASHCTL_START | opcode);
+ for (i = 0; i < 1000; i++) {
+ if (!(chipco_read32(cc, SSB_CHIPCO_FLASHCTL) &
+ SSB_CHIPCO_FLASHCTL_BUSY))
+ return;
+ cpu_relax();
+ }
+ pr_err("SFLASH control command failed (timeout)!\n");
+}
+
+/* Initialize serial flash access */
+int ssb_sflash_init(struct ssb_chipcommon *cc)
+{
+ struct ssb_sflash *sflash = &cc->dev->bus->mipscore.sflash;
+ const struct ssb_sflash_tbl_e *e;
+ u32 id, id2;
+
+ switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) {
+ case SSB_CHIPCO_FLASHT_STSER:
+ ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_DP);
+
+ chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 0);
+ ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
+ id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
+
+ chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 1);
+ ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
+ id2 = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
+
+ switch (id) {
+ case 0xbf:
+ for (e = ssb_sflash_sst_tbl; e->name; e++) {
+ if (e->id == id2)
+ break;
+ }
+ break;
+ case 0x13:
+ return -ENOTSUPP;
+ default:
+ for (e = ssb_sflash_st_tbl; e->name; e++) {
+ if (e->id == id)
+ break;
+ }
+ break;
+ }
+ if (!e->name) {
+ pr_err("Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n",
+ id, id2);
+ return -ENOTSUPP;
+ }
+
+ break;
+ case SSB_CHIPCO_FLASHT_ATSER:
+ ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_AT_STATUS);
+ id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA) & 0x3c;
+
+ for (e = ssb_sflash_at_tbl; e->name; e++) {
+ if (e->id == id)
+ break;
+ }
+ if (!e->name) {
+ pr_err("Unsupported Atmel serial flash (id: 0x%X)\n",
+ id);
+ return -ENOTSUPP;
+ }
+
+ break;
+ default:
+ pr_err("Unsupported flash type\n");
+ return -ENOTSUPP;
+ }
+
+ sflash->window = SSB_FLASH2;
+ sflash->blocksize = e->blocksize;
+ sflash->numblocks = e->numblocks;
+ sflash->size = sflash->blocksize * sflash->numblocks;
+ sflash->present = true;
+
+ pr_info("Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
+ e->name, sflash->size / 1024, e->blocksize, e->numblocks);
+
+ /* Prepare platform device, but don't register it yet. It's too early,
+ * malloc (required by device_private_init) is not available yet. */
+ ssb_sflash_dev.resource[0].end = ssb_sflash_dev.resource[0].start +
+ sflash->size;
+ ssb_sflash_dev.dev.platform_data = sflash;
+
+ return 0;
+}