Merge tag 'gpio-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...

[~andy/linux] / drivers / bcma / driver_chipcommon_sflash.c

diff --git a/drivers/bcma/driver_chipcommon_sflash.c b/drivers/bcma/driver_chipcommon_sflash.c
index 6e157a58a1d7f9dc68ea10251c4157a2c2f2c012..2c4eec2ca5a0784bd50d392a84edc74911a58916 100644 (file)
--- a/drivers/bcma/driver_chipcommon_sflash.c
+++ b/drivers/bcma/driver_chipcommon_sflash.c
@@ -5,15 +5,132 @@
  * Licensed under the GNU/GPL. See COPYING for details.
  */
 
+#include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>
-#include <linux/bcma/bcma_driver_chipcommon.h>
-#include <linux/delay.h>
 
 #include "bcma_private.h"
 
+static struct resource bcma_sflash_resource = {
+       .name   = "bcma_sflash",
+       .start  = BCMA_SFLASH,
+       .end    = 0,
+       .flags  = IORESOURCE_MEM | IORESOURCE_READONLY,
+};
+
+struct platform_device bcma_sflash_dev = {
+       .name           = "bcma_sflash",
+       .resource       = &bcma_sflash_resource,
+       .num_resources  = 1,
+};
+
+struct bcma_sflash_tbl_e {
+       char *name;
+       u32 id;
+       u32 blocksize;
+       u16 numblocks;
+};
+
+static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
+       { "", 0x14, 0x10000, 32, },
+       { 0 },
+};
+
+static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
+       { 0 },
+};
+
+static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
+       { 0 },
+};
+
+static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
+{
+       int i;
+       bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
+                       BCMA_CC_FLASHCTL_START | opcode);
+       for (i = 0; i < 1000; i++) {
+               if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
+                     BCMA_CC_FLASHCTL_BUSY))
+                       return;
+               cpu_relax();
+       }
+       bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
+}
+
 /* Initialize serial flash access */
 int bcma_sflash_init(struct bcma_drv_cc *cc)
 {
-       bcma_err(cc->core->bus, "Serial flash support is broken\n");
+       struct bcma_bus *bus = cc->core->bus;
+       struct bcma_sflash *sflash = &cc->sflash;
+       struct bcma_sflash_tbl_e *e;
+       u32 id, id2;
+
+       switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
+       case BCMA_CC_FLASHT_STSER:
+               bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
+
+               bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
+               bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
+               id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
+
+               bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
+               bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
+               id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
+
+               switch (id) {
+               case 0xbf:
+                       for (e = bcma_sflash_sst_tbl; e->name; e++) {
+                               if (e->id == id2)
+                                       break;
+                       }
+                       break;
+               default:
+                       for (e = bcma_sflash_st_tbl; e->name; e++) {
+                               if (e->id == id)
+                                       break;
+                       }
+                       break;
+               }
+               if (!e->name) {
+                       bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
+                       return -ENOTSUPP;
+               }
+
+               break;
+       case BCMA_CC_FLASHT_ATSER:
+               bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
+               id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
+
+               for (e = bcma_sflash_at_tbl; e->name; e++) {
+                       if (e->id == id)
+                               break;
+               }
+               if (!e->name) {
+                       bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
+                       return -ENOTSUPP;
+               }
+
+               break;
+       default:
+               bcma_err(bus, "Unsupported flash type\n");
+               return -ENOTSUPP;
+       }
+
+       sflash->window = BCMA_SFLASH;
+       sflash->blocksize = e->blocksize;
+       sflash->numblocks = e->numblocks;
+       sflash->size = sflash->blocksize * sflash->numblocks;
+       sflash->present = true;
+
+       bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
+                 e->name, sflash->size / 1024, sflash->blocksize,
+                 sflash->numblocks);
+
+       /* Prepare platform device, but don't register it yet. It's too early,
+        * malloc (required by device_private_init) is not available yet. */
+       bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
+                                         sflash->size;
+       bcma_sflash_dev.dev.platform_data = sflash;
+
        return 0;
 }