bcma: detect and register serial flash device

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

6 files changed, 146 insertions, 4 deletions

diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig
index 06b3207adeb..cf6e4dd22fd 100644
--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -48,7 +48,7 @@ config BCMA_DRIVER_MIPS
 
 config BCMA_SFLASH
         bool
-        depends on BCMA_DRIVER_MIPS && BROKEN
+        depends on BCMA_DRIVER_MIPS
         default y
 
 config BCMA_NFLASH
diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h
index 3cf9cc923cd..94bf07c54a4 100644
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -54,6 +54,7 @@ u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc);
 #ifdef CONFIG_BCMA_SFLASH
 /* driver_chipcommon_sflash.c */
 int bcma_sflash_init(struct bcma_drv_cc *cc);
+extern struct platform_device bcma_sflash_dev;
 #else
 static inline int bcma_sflash_init(struct bcma_drv_cc *cc)
 {
diff --git a/drivers/bcma/driver_chipcommon_sflash.c b/drivers/bcma/driver_chipcommon_sflash.c
index 6e157a58a1d..2c4eec2ca5a 100644
--- 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;
 }
diff --git a/drivers/bcma/main.c b/drivers/bcma/main.c
index 758af9ccdef..a501d259287 100644
--- a/drivers/bcma/main.c
+++ b/drivers/bcma/main.c
@@ -7,6 +7,7 @@
 
 #include "bcma_private.h"
 #include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/bcma/bcma.h>
 #include <linux/slab.h>
 
@@ -136,6 +137,14 @@ static int bcma_register_cores(struct bcma_bus *bus)
                 dev_id++;
         }
 
+#ifdef CONFIG_BCMA_SFLASH
+        if (bus->drv_cc.sflash.present) {
+                err = platform_device_register(&bcma_sflash_dev);
+                if (err)
+                        bcma_err(bus, "Error registering serial flash\n");
+        }
+#endif
+
         return 0;
 }
 
diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h
index fcb06fb284e..bed89694c5f 100644
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -509,6 +509,16 @@ struct bcma_pflash {
         u32 window_size;
 };
 
+#ifdef CONFIG_BCMA_SFLASH
+struct bcma_sflash {
+        bool present;
+        u32 window;
+        u32 blocksize;
+        u16 numblocks;
+        u32 size;
+};
+#endif
+
 struct bcma_serial_port {
         void *regs;
         unsigned long clockspeed;
@@ -529,6 +539,9 @@ struct bcma_drv_cc {
         struct bcma_chipcommon_pmu pmu;
 #ifdef CONFIG_BCMA_DRIVER_MIPS
         struct bcma_pflash pflash;
+#ifdef CONFIG_BCMA_SFLASH
+        struct bcma_sflash sflash;
+#endif
 
         int nr_serial_ports;
         struct bcma_serial_port serial_ports[4];
diff --git a/include/linux/bcma/bcma_regs.h b/include/linux/bcma/bcma_regs.h
index a393e82bf7b..6c9cb93ae3d 100644
--- a/include/linux/bcma/bcma_regs.h
+++ b/include/linux/bcma/bcma_regs.h
@@ -85,4 +85,6 @@
                                                          * (2 ZettaBytes), high 32 bits
                                                          */
 
+#define BCMA_SFLASH                     0x1c000000
+
 #endif /* LINUX_BCMA_REGS_H_ */