vc/cavium/{bdk,include}: Clean up bdk_phys_to_ptr() calls

The bdk_phys_to_ptr() function converts a uint64_t address to a void *
pointer. Judging by the comments, the old implementation had a check
that would refuse to convert a null pointer, which required several
workarounds when trying to convert the address 0 to a pointer. This
isn't the case for coreboot though, which implements this function
as a simple (void *) cast, so we can remove the old workarounds.

Change-Id: I6537d1699e6726c1fb155d69a51e14da856232de
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1393962
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/vendorcode/cavium/bdk/libbdk-dram/bdk-dram-test-addrbus.c

@@ -60,7 +60,7 @@ int __bdk_dram_test_mem_address_bus(uint64_t area, uint64_t max_address, int bur
 
     /* Clear our work area. Checking for aliases later could get false
        positives if it matched stale data */
-    void *ptr = (area) ? bdk_phys_to_ptr(area) : NULL;
+    void *ptr = bdk_phys_to_ptr(area);
     bdk_zero_memory(ptr, max_address - area);
     __bdk_dram_flush_to_mem_range(area, max_address);
 

src/vendorcode/cavium/bdk/libbdk-dram/bdk-dram-test.c

@@ -101,9 +101,7 @@ static uint64_t dram_test_thread_size;
 void __bdk_dram_flush_to_mem(uint64_t address)
 {
     BDK_MB;
-    /* The DRAM code doesn't use the normal bdk_phys_to_ptr() because of the
-       NULL check in it. This greatly slows down the memory tests */
-    char *ptr = (void*)address;
+    char *ptr = bdk_phys_to_ptr(address);
     BDK_CACHE_WBI_L2(ptr);
 }
 
@@ -116,10 +114,8 @@ void __bdk_dram_flush_to_mem(uint64_t address)
  */
 void __bdk_dram_flush_to_mem_range(uint64_t area, uint64_t max_address)
 {
-    /* The DRAM code doesn't use the normal bdk_phys_to_ptr() because of the
-       NULL check in it. This greatly slows down the memory tests */
-    char *ptr = (void*)area;
-    char *end = (void*)max_address;
+    char *ptr = bdk_phys_to_ptr(area);
+    char *end = bdk_phys_to_ptr(max_address);
     BDK_MB;
     while (ptr < end)
     {

src/vendorcode/cavium/bdk/libbdk-hal/bdk-l2c.c

@@ -141,7 +141,7 @@ int bdk_l2c_unlock_mem_region(bdk_node_t node, uint64_t start, uint64_t len)
     len += start & BDK_CACHE_LINE_MASK;
     start &= ~BDK_CACHE_LINE_MASK;
     len = (len + BDK_CACHE_LINE_MASK) & ~BDK_CACHE_LINE_MASK;
-    void *ptr = (start) ? bdk_phys_to_ptr(start) : NULL;
+    void *ptr = bdk_phys_to_ptr(start);
 
     while (len > 0)
     {

src/vendorcode/cavium/bdk/libdram/libdram.c

@@ -79,10 +79,7 @@ static void bdk_dram_clear_mem(bdk_node_t node)
             write to the cache line isn't good enough because partial LMC
             writes may be enabled */
          ddr_print("N%d: Rewriting DRAM: start 0 length 0x%llx\n", node, skip);
-         volatile uint64_t *ptr = bdk_phys_to_ptr(bdk_numa_get_address(node, 8));
-         /* The above pointer got address 8 to avoid NULL pointer checking
-            in bdk_phys_to_ptr(). Correct it here */
-         ptr--;
+         volatile uint64_t *ptr = bdk_phys_to_ptr(bdk_numa_get_address(node, 0));
          uint64_t *end = bdk_phys_to_ptr(bdk_numa_get_address(node, skip));
          while (ptr < end)
          {

src/vendorcode/cavium/include/bdk/libbdk-dram/bdk-dram-test.h

@@ -161,17 +161,13 @@ extern int  __bdk_dram_retry_failure2(int burst, uint64_t address1, uint64_t dat
 
 static inline void __bdk_dram_write64(uint64_t address, uint64_t data)
 {
-    /* The DRAM code doesn't use the normal bdk_phys_to_ptr() because of the
-       NULL check in it. This greatly slows down the memory tests */
-    volatile uint64_t *ptr = (void*)address;
+    volatile uint64_t *ptr = bdk_phys_to_ptr(address);
     *ptr = data;
 }
 
 static inline uint64_t __bdk_dram_read64(uint64_t address)
 {
-    /* The DRAM code doesn't use the normal bdk_phys_to_ptr() because of the
-       NULL check in it. This greatly slows down the memory tests */
-    volatile uint64_t *ptr = (void*)address;
+    volatile uint64_t *ptr = bdk_phys_to_ptr(address);
     return *ptr;
 }