net/cxgbe: fix init failure due to new flash parts

Add decode logic for new flash parts shipped with new Chelsio NICs
to fix initialization failure on these NICs.

Cc: stable@dpdk.org
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>

diff --git a/drivers/net/cxgbe/base/t4_hw.c b/drivers/net/cxgbe/base/t4_hw.c
index 628b280..31762c9 100644 (file)
--- a/drivers/net/cxgbe/base/t4_hw.c
+++ b/drivers/net/cxgbe/base/t4_hw.c
@@ -4681,9 +4681,8 @@ struct flash_desc {
 int t4_get_flash_params(struct adapter *adapter)
 {
        /*
-        * Table for non-Numonix supported flash parts.  Numonix parts are left
-        * to the preexisting well-tested code.  All flash parts have 64KB
-        * sectors.
+        * Table for non-standard supported Flash parts.  Note, all Flash
+        * parts must have 64KB sectors.
         */
        static struct flash_desc supported_flash[] = {
                { 0x00150201, 4 << 20 },       /* Spansion 4MB S25FL032P */
@@ -4692,7 +4691,7 @@ int t4_get_flash_params(struct adapter *adapter)
        int ret;
        u32 flashid = 0;
        unsigned int part, manufacturer;
-       unsigned int density, size;
+       unsigned int density, size = 0;
 
        /**
         * Issue a Read ID Command to the Flash part.  We decode supported
@@ -4707,6 +4706,9 @@ int t4_get_flash_params(struct adapter *adapter)
        if (ret < 0)
                return ret;
 
+       /**
+        * Check to see if it's one of our non-standard supported Flash parts.
+        */
        for (part = 0; part < ARRAY_SIZE(supported_flash); part++) {
                if (supported_flash[part].vendor_and_model_id == flashid) {
                        adapter->params.sf_size =
@@ -4717,6 +4719,15 @@ int t4_get_flash_params(struct adapter *adapter)
                }
        }
 
+       /**
+        * Decode Flash part size.  The code below looks repetative with
+        * common encodings, but that's not guaranteed in the JEDEC
+        * specification for the Read JADEC ID command.  The only thing that
+        * we're guaranteed by the JADEC specification is where the
+        * Manufacturer ID is in the returned result.  After that each
+        * Manufacturer ~could~ encode things completely differently.
+        * Note, all Flash parts must have 64KB sectors.
+        */
        manufacturer = flashid & 0xff;
        switch (manufacturer) {
        case 0x20: { /* Micron/Numonix */
@@ -4753,20 +4764,80 @@ int t4_get_flash_params(struct adapter *adapter)
                case 0x22:
                        size = 1 << 28; /* 256MB */
                        break;
-               default:
-                       dev_err(adapter, "Micron Flash Part has bad size, ID = %#x, Density code = %#x\n",
-                               flashid, density);
-                       return -EINVAL;
                }
+               break;
+       }
 
-               adapter->params.sf_size = size;
-               adapter->params.sf_nsec = size / SF_SEC_SIZE;
+       case 0x9d: { /* ISSI -- Integrated Silicon Solution, Inc. */
+               /**
+                * This Density -> Size decoding table is taken from ISSI
+                * Data Sheets.
+                */
+               density = (flashid >> 16) & 0xff;
+               switch (density) {
+               case 0x16:
+                       size = 1 << 25; /* 32MB */
+                       break;
+               case 0x17:
+                       size = 1 << 26; /* 64MB */
+                       break;
+               }
                break;
        }
-       default:
-               dev_err(adapter, "Unsupported Flash Part, ID = %#x\n", flashid);
-               return -EINVAL;
+
+       case 0xc2: { /* Macronix */
+               /**
+                * This Density -> Size decoding table is taken from Macronix
+                * Data Sheets.
+                */
+               density = (flashid >> 16) & 0xff;
+               switch (density) {
+               case 0x17:
+                       size = 1 << 23; /* 8MB */
+                       break;
+               case 0x18:
+                       size = 1 << 24; /* 16MB */
+                       break;
+               }
+               break;
+       }
+
+       case 0xef: { /* Winbond */
+               /**
+                * This Density -> Size decoding table is taken from Winbond
+                * Data Sheets.
+                */
+               density = (flashid >> 16) & 0xff;
+               switch (density) {
+               case 0x17:
+                       size = 1 << 23; /* 8MB */
+                       break;
+               case 0x18:
+                       size = 1 << 24; /* 16MB */
+                       break;
+               }
+               break;
        }
+       }
+
+       /* If we didn't recognize the FLASH part, that's no real issue: the
+        * Hardware/Software contract says that Hardware will _*ALWAYS*_
+        * use a FLASH part which is at least 4MB in size and has 64KB
+        * sectors.  The unrecognized FLASH part is likely to be much larger
+        * than 4MB, but that's all we really need.
+        */
+       if (size == 0) {
+               dev_warn(adapter,
+                        "Unknown Flash Part, ID = %#x, assuming 4MB\n",
+                        flashid);
+               size = 1 << 22;
+       }
+
+       /**
+        * Store decoded Flash size and fall through into vetting code.
+        */
+       adapter->params.sf_size = size;
+       adapter->params.sf_nsec = size / SF_SEC_SIZE;
 
 found:
        /*