driver: net: fsl-mc: Update calculation of MC RAM

Since the reserved RAM is tracked by gd->arch.resv_ram, calculation
of MC memory blocks can be simplified. The MC RAM is guaranteed to be
aligned by the reservation process.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Priyanka Jain <priyanka.jain@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/fsl-mc/mc.c

@@ -154,48 +154,6 @@ int parse_mc_firmware_fit_image(u64 mc_fw_addr,
 }
 #endif
 
-/*
- * Calculates the values to be used to specify the address range
- * for the MC private DRAM block, in the MCFBALR/MCFBAHR registers.
- * It returns the highest 512MB-aligned address within the given
- * address range, in '*aligned_base_addr', and the number of 256 MiB
- * blocks in it, in 'num_256mb_blocks'.
- */
-static int calculate_mc_private_ram_params(u64 mc_private_ram_start_addr,
-					   size_t mc_ram_size,
-					   u64 *aligned_base_addr,
-					   u8 *num_256mb_blocks)
-{
-	u64 addr;
-	u16 num_blocks;
-
-	if (mc_ram_size % MC_RAM_SIZE_ALIGNMENT != 0) {
-		printf("fsl-mc: ERROR: invalid MC private RAM size (%lu)\n",
-		       mc_ram_size);
-		return -EINVAL;
-	}
-
-	num_blocks = mc_ram_size / MC_RAM_SIZE_ALIGNMENT;
-	if (num_blocks < 1 || num_blocks > 0xff) {
-		printf("fsl-mc: ERROR: invalid MC private RAM size (%lu)\n",
-		       mc_ram_size);
-		return -EINVAL;
-	}
-
-	addr = (mc_private_ram_start_addr + mc_ram_size - 1) &
-		MC_RAM_BASE_ADDR_ALIGNMENT_MASK;
-
-	if (addr < mc_private_ram_start_addr) {
-		printf("fsl-mc: ERROR: bad start address %#llx\n",
-		       mc_private_ram_start_addr);
-		return -EFAULT;
-	}
-
-	*aligned_base_addr = addr;
-	*num_256mb_blocks = num_blocks;
-	return 0;
-}
-
 static int mc_fixup_dpc_mac_addr(void *blob, int noff, int dpmac_id,
 		struct eth_device *eth_dev)
 {
@@ -550,17 +508,16 @@ int mc_init(u64 mc_fw_addr, u64 mc_dpc_addr)
 	size_t raw_image_size = 0;
 #endif
 	struct mc_version mc_ver_info;
-	u64 mc_ram_aligned_base_addr;
 	u8 mc_ram_num_256mb_blocks;
 	size_t mc_ram_size = mc_get_dram_block_size();
 
-
-	error = calculate_mc_private_ram_params(mc_ram_addr,
-						mc_ram_size,
-						&mc_ram_aligned_base_addr,
-						&mc_ram_num_256mb_blocks);
-	if (error != 0)
+	mc_ram_num_256mb_blocks = mc_ram_size / MC_RAM_SIZE_ALIGNMENT;
+	if (mc_ram_num_256mb_blocks < 1 || mc_ram_num_256mb_blocks > 0xff) {
+		error = -EINVAL;
+		printf("fsl-mc: ERROR: invalid MC private RAM size (%lu)\n",
+		       mc_ram_size);
 		goto out;
+	}
 
 	/*
 	 * Management Complex cores should be held at reset out of POR.
@@ -602,11 +559,11 @@ int mc_init(u64 mc_fw_addr, u64 mc_dpc_addr)
 	/*
 	 * Tell MC what is the address range of the DRAM block assigned to it:
 	 */
-	reg_mcfbalr = (u32)mc_ram_aligned_base_addr |
+	reg_mcfbalr = (u32)mc_ram_addr |
 		      (mc_ram_num_256mb_blocks - 1);
 	out_le32(&mc_ccsr_regs->reg_mcfbalr, reg_mcfbalr);
 	out_le32(&mc_ccsr_regs->reg_mcfbahr,
-		 (u32)(mc_ram_aligned_base_addr >> 32));
+		 (u32)(mc_ram_addr >> 32));
 	out_le32(&mc_ccsr_regs->reg_mcfapr, FSL_BYPASS_AMQ);
 
 	/*