memory: omap-gpmc: Prevent mapping into 1st 16MB

We have been preventing mapping GPMC children in the
first 1MB but really it has to be the first 16MB as
the minimum GPMC partition size is 16MB.

Also print an error message if CS mapping fails
due to DT requesting address outside the GPMC
map.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 8dc6e3b1c44a..bfe4e8710973 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -94,6 +94,14 @@
 #define GPMC_CS_SIZE            0x30
 #define GPMC_BCH_SIZE           0x10
 
+/*
+ * The first 1MB of GPMC address space is typically mapped to
+ * the internal ROM. Never allocate the first page, to
+ * facilitate bug detection; even if we didn't boot from ROM.
+ * As GPMC minimum partition size is 16MB we can only start from
+ * there.
+ */
+#define GPMC_MEM_START          0x1000000
 #define GPMC_MEM_END            0x3FFFFFFF
 
 #define GPMC_CHUNK_SHIFT        24              /* 16 MB */
@@ -1297,12 +1305,7 @@ static void gpmc_mem_init(void)
 {
         int cs;
 
-        /*
-         * The first 1MB of GPMC address space is typically mapped to
-         * the internal ROM. Never allocate the first page, to
-         * facilitate bug detection; even if we didn't boot from ROM.
-         */
-        gpmc_mem_root.start = SZ_1M;
+        gpmc_mem_root.start = GPMC_MEM_START;
         gpmc_mem_root.end = GPMC_MEM_END;
 
         /* Reserve all regions that has been set up by bootloader */
@@ -1966,6 +1969,15 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
         if (ret < 0) {
                 dev_err(&pdev->dev, "cannot remap GPMC CS %d to %pa\n",
                         cs, &res.start);
+                if (res.start < GPMC_MEM_START) {
+                        dev_info(&pdev->dev,
+                                 "GPMC CS %d start cannot be lesser than 0x%x\n",
+                                 cs, GPMC_MEM_START);
+                } else if (res.end > GPMC_MEM_END) {
+                        dev_info(&pdev->dev,
+                                 "GPMC CS %d end cannot be greater than 0x%x\n",
+                                 cs, GPMC_MEM_END);
+                }
                 goto err;
         }