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>

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 8dc6e3b1c44a7b047ddef21b58c27e96c32efe7c..bfe4e8710973577ed67ce1549d61905509b13fa6 100644 (file)
--- 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;
        }