FSL LAW: Keep track of LAW allocations

Make it so we keep track of which LAWs have allocated and provide
a function (set_next_law) which can allocate a LAW for us if one is
free.

In the future we will move to doing more "dynamic" LAW allocation
since the majority of users dont really care about what LAW number
they are at.

Also, add CONFIG_MPC8540 or CONFIG_MPC8560 to those boards which needed them

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andy Fleming <afleming@freescale.com>

1 files changed, 39 insertions, 7 deletions

diff --git a/drivers/misc/fsl_law.c b/drivers/misc/fsl_law.c
index dca6a4da4a0..d7d6c403baa 100644
--- a/drivers/misc/fsl_law.c
+++ b/drivers/misc/fsl_law.c
@@ -27,8 +27,22 @@
 #include <asm/fsl_law.h>
 #include <asm/io.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #define LAWAR_EN	0x80000000
-#define FSL_HW_NUM_LAWS 10	/* number of LAWs in the hw implementation */
+/* number of LAWs in the hw implementation */
+#if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
+    defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
+#define FSL_HW_NUM_LAWS 8
+#elif defined(CONFIG_MPC8548) || defined(CONFIG_MPC8544) || \
+      defined(CONFIG_MPC8568) || \
+      defined(CONFIG_MPC8641) || defined(CONFIG_MPC8610)
+#define FSL_HW_NUM_LAWS 10
+#elif defined(CONFIG_MPC8572)
+#define FSL_HW_NUM_LAWS 12
+#else
+#error FSL_HW_NUM_LAWS not defined for this platform
+#endif
 
 void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
 {
@@ -36,18 +50,34 @@ void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
 	volatile u32 *lawbar = base + 8 * idx;
 	volatile u32 *lawar = base + 8 * idx + 2;
 
+	gd->used_laws |= (1 << idx);
+
 	out_be32(lawbar, addr >> 12);
 	out_be32(lawar, LAWAR_EN | ((u32)id << 20) | (u32)sz);
 
 	return ;
 }
 
+int set_next_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
+{
+	u32 idx = ffz(gd->used_laws);
+
+	if (idx >= FSL_HW_NUM_LAWS)
+		return -1;
+
+	set_law(idx, addr, sz, id);
+
+	return idx;
+}
+
 void disable_law(u8 idx)
 {
 	volatile u32 *base = (volatile u32 *)(CFG_IMMR + 0xc08);
 	volatile u32 *lawbar = base + 8 * idx;
 	volatile u32 *lawar = base + 8 * idx + 2;
 
+	gd->used_laws &= ~(1 << idx);
+
 	out_be32(lawar, 0);
 	out_be32(lawbar, 0);
 
@@ -75,14 +105,16 @@ void print_laws(void)
 void init_laws(void)
 {
 	int i;
-	u8 law_idx = 0;
 
-	for (i = 0; i < num_law_entries; i++) {
-		if (law_table[i].index != -1)
-			law_idx = law_table[i].index;
+	gd->used_laws = ~((1 << FSL_HW_NUM_LAWS) - 1);
 
-		set_law(law_idx++, law_table[i].addr,
-			law_table[i].size, law_table[i].trgt_id);
+	for (i = 0; i < num_law_entries; i++) {
+		if (law_table[i].index == -1)
+			set_next_law(law_table[i].addr, law_table[i].size,
+					law_table[i].trgt_id);
+		else
+			set_law(law_table[i].index, law_table[i].addr,
+				law_table[i].size, law_table[i].trgt_id);
 	}
 
 	return ;