bcma: get info about flash type SoC booted from

There is an ongoing work on cleaning MIPS's nvram support so it could be
re-used on other platforms (bcm53xx to say precisely).
This will require a bit of extra logic in bcma this patch implements.

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

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/bcma/driver_mips.c b/drivers/bcma/driver_mips.c
index 11115bbe115c..004d6aa671ce 100644
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -21,6 +21,14 @@
 #include <linux/serial_reg.h>
 #include <linux/time.h>
 
+enum bcma_boot_dev {
+        BCMA_BOOT_DEV_UNK = 0,
+        BCMA_BOOT_DEV_ROM,
+        BCMA_BOOT_DEV_PARALLEL,
+        BCMA_BOOT_DEV_SERIAL,
+        BCMA_BOOT_DEV_NAND,
+};
+
 static const char * const part_probes[] = { "bcm47xxpart", NULL };
 
 static struct physmap_flash_data bcma_pflash_data = {
@@ -229,11 +237,51 @@ u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
 }
 EXPORT_SYMBOL(bcma_cpu_clock);
 
+static enum bcma_boot_dev bcma_boot_dev(struct bcma_bus *bus)
+{
+        struct bcma_drv_cc *cc = &bus->drv_cc;
+        u8 cc_rev = cc->core->id.rev;
+
+        if (cc_rev == 42) {
+                struct bcma_device *core;
+
+                core = bcma_find_core(bus, BCMA_CORE_NS_ROM);
+                if (core) {
+                        switch (bcma_aread32(core, BCMA_IOST) &
+                                BCMA_NS_ROM_IOST_BOOT_DEV_MASK) {
+                        case BCMA_NS_ROM_IOST_BOOT_DEV_NOR:
+                                return BCMA_BOOT_DEV_SERIAL;
+                        case BCMA_NS_ROM_IOST_BOOT_DEV_NAND:
+                                return BCMA_BOOT_DEV_NAND;
+                        case BCMA_NS_ROM_IOST_BOOT_DEV_ROM:
+                        default:
+                                return BCMA_BOOT_DEV_ROM;
+                        }
+                }
+        } else {
+                if (cc_rev == 38) {
+                        if (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT)
+                                return BCMA_BOOT_DEV_NAND;
+                        else if (cc->status & BIT(5))
+                                return BCMA_BOOT_DEV_ROM;
+                }
+
+                if ((cc->capabilities & BCMA_CC_CAP_FLASHT) ==
+                    BCMA_CC_FLASHT_PARA)
+                        return BCMA_BOOT_DEV_PARALLEL;
+                else
+                        return BCMA_BOOT_DEV_SERIAL;
+        }
+
+        return BCMA_BOOT_DEV_SERIAL;
+}
+
 static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
 {
         struct bcma_bus *bus = mcore->core->bus;
         struct bcma_drv_cc *cc = &bus->drv_cc;
         struct bcma_pflash *pflash = &cc->pflash;
+        enum bcma_boot_dev boot_dev;
 
         switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
         case BCMA_CC_FLASHT_STSER:
@@ -269,6 +317,20 @@ static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
                         bcma_nflash_init(cc);
                 }
         }
+
+        /* Determine flash type this SoC boots from */
+        boot_dev = bcma_boot_dev(bus);
+        switch (boot_dev) {
+        case BCMA_BOOT_DEV_PARALLEL:
+        case BCMA_BOOT_DEV_SERIAL:
+                /* TODO: Init NVRAM using BCMA_SOC_FLASH2 window */
+                break;
+        case BCMA_BOOT_DEV_NAND:
+                /* TODO: Init NVRAM using BCMA_SOC_FLASH1 window */
+                break;
+        default:
+                break;
+        }
 }
 
 void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)