nfp: save the MU locality field offset

We will soon need the MU locality field offset much more
often than just for decoding MIP address.  Save it in nfp_cpp
for quick access.  Note that we can already reuse the target
config from nfp_cpp, no need to do the XPB read.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Francois H. Theron <francois.theron@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpp.h

@@ -233,6 +233,7 @@ void nfp_cpp_free(struct nfp_cpp *cpp);
 u32 nfp_cpp_model(struct nfp_cpp *cpp);
 u16 nfp_cpp_interface(struct nfp_cpp *cpp);
 int nfp_cpp_serial(struct nfp_cpp *cpp, const u8 **serial);
+unsigned int nfp_cpp_mu_locality_lsb(struct nfp_cpp *cpp);
 
 struct nfp_cpp_area *nfp_cpp_area_alloc_with_name(struct nfp_cpp *cpp,
 						  u32 cpp_id,

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c

@@ -75,6 +75,7 @@ struct nfp_cpp_resource {
  * @interface:		chip interface id we are using to reach it
  * @serial:		chip serial number
  * @imb_cat_table:	CPP Mapping Table
+ * @mu_locality_lsb:	MU access type bit offset
  *
  * Following fields use explicit locking:
  * @resource_list:	NFP CPP resource list
@@ -100,6 +101,7 @@ struct nfp_cpp {
 	wait_queue_head_t waitq;
 
 	u32 imb_cat_table[16];
+	unsigned int mu_locality_lsb;
 
 	struct mutex area_cache_mutex;
 	struct list_head area_cache_list;
@@ -266,6 +268,34 @@ int nfp_cpp_serial(struct nfp_cpp *cpp, const u8 **serial)
 	return sizeof(cpp->serial);
 }
 
+#define NFP_IMB_TGTADDRESSMODECFG_MODE_of(_x)		(((_x) >> 13) & 0x7)
+#define NFP_IMB_TGTADDRESSMODECFG_ADDRMODE		BIT(12)
+#define   NFP_IMB_TGTADDRESSMODECFG_ADDRMODE_32_BIT	0
+#define   NFP_IMB_TGTADDRESSMODECFG_ADDRMODE_40_BIT	BIT(12)
+
+static int nfp_cpp_set_mu_locality_lsb(struct nfp_cpp *cpp)
+{
+	unsigned int mode, addr40;
+	u32 imbcppat;
+	int res;
+
+	imbcppat = cpp->imb_cat_table[NFP_CPP_TARGET_MU];
+	mode = NFP_IMB_TGTADDRESSMODECFG_MODE_of(imbcppat);
+	addr40 = !!(imbcppat & NFP_IMB_TGTADDRESSMODECFG_ADDRMODE);
+
+	res = nfp_cppat_mu_locality_lsb(mode, addr40);
+	if (res < 0)
+		return res;
+	cpp->mu_locality_lsb = res;
+
+	return 0;
+}
+
+unsigned int nfp_cpp_mu_locality_lsb(struct nfp_cpp *cpp)
+{
+	return cpp->mu_locality_lsb;
+}
+
 /**
  * nfp_cpp_area_alloc_with_name() - allocate a new CPP area
  * @cpp:	CPP device handle
@@ -1241,6 +1271,12 @@ nfp_cpp_from_operations(const struct nfp_cpp_operations *ops,
 	nfp_cpp_readl(cpp, arm, NFP_ARM_GCSR + NFP_ARM_GCSR_SOFTMODEL3,
 		      &mask[1]);
 
+	err = nfp_cpp_set_mu_locality_lsb(cpp);
+	if (err < 0) {
+		dev_err(parent,	"Can't calculate MU locality bit offset\n");
+		goto err_out;
+	}
+
 	dev_info(cpp->dev.parent, "Model: 0x%08x, SN: %pM, Ifc: 0x%04x\n",
 		 nfp_cpp_model(cpp), cpp->serial, nfp_cpp_interface(cpp));
 

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nffw.c

@@ -156,29 +156,6 @@ static u64 nffw_fwinfo_mip_offset_get(const struct nffw_fwinfo *fi)
 	return (mip_off_hi & 0xFF) << 32 | le32_to_cpu(fi->mip_offset_lo);
 }
 
-#define NFP_IMB_TGTADDRESSMODECFG_MODE_of(_x)		(((_x) >> 13) & 0x7)
-#define NFP_IMB_TGTADDRESSMODECFG_ADDRMODE		BIT(12)
-#define   NFP_IMB_TGTADDRESSMODECFG_ADDRMODE_32_BIT	0
-#define   NFP_IMB_TGTADDRESSMODECFG_ADDRMODE_40_BIT	BIT(12)
-
-static int nfp_mip_mu_locality_lsb(struct nfp_cpp *cpp)
-{
-	unsigned int mode, addr40;
-	u32 xpbaddr, imbcppat;
-	int err;
-
-	/* Hardcoded XPB IMB Base, island 0 */
-	xpbaddr = 0x000a0000 + NFP_CPP_TARGET_MU * 4;
-	err = nfp_xpb_readl(cpp, xpbaddr, &imbcppat);
-	if (err < 0)
-		return err;
-
-	mode = NFP_IMB_TGTADDRESSMODECFG_MODE_of(imbcppat);
-	addr40 = !!(imbcppat & NFP_IMB_TGTADDRESSMODECFG_ADDRMODE);
-
-	return nfp_cppat_mu_locality_lsb(mode, addr40);
-}
-
 static unsigned int
 nffw_res_fwinfos(struct nfp_nffw_info_data *fwinf, struct nffw_fwinfo **arr)
 {
@@ -304,14 +281,7 @@ int nfp_nffw_info_mip_first(struct nfp_nffw_info *state, u32 *cpp_id, u64 *off)
 	*off = nffw_fwinfo_mip_offset_get(fwinfo);
 
 	if (nffw_fwinfo_mip_mu_da_get(fwinfo)) {
-		int locality_off;
-
-		if (NFP_CPP_ID_TARGET_of(*cpp_id) != NFP_CPP_TARGET_MU)
-			return 0;
-
-		locality_off = nfp_mip_mu_locality_lsb(state->cpp);
-		if (locality_off < 0)
-			return locality_off;
+		int locality_off = nfp_cpp_mu_locality_lsb(state->cpp);
 
 		*off &= ~(NFP_MU_ADDR_ACCESS_TYPE_MASK << locality_off);
 		*off |= NFP_MU_ADDR_ACCESS_TYPE_DIRECT << locality_off;