[POWERPC] bootwrapper: Add dt_is_compatible()

This can be used rather than doing a simple strcmp, which will fail to
handle multiple compatible entries.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/boot/devtree.c b/arch/powerpc/boot/devtree.c
index 129e6d9b8d432d1f805a45c3d517df8bc1b4f742..3a18bfe0fdf75e29cc27e828d1d144c6d98b2fc0 100644 (file)
--- a/arch/powerpc/boot/devtree.c
+++ b/arch/powerpc/boot/devtree.c
@@ -113,7 +113,6 @@ void __dt_fixup_mac_addresses(u32 startindex, ...)
 }
 
 #define MAX_ADDR_CELLS 4
-#define MAX_RANGES 8
 
 static void get_reg_format(void *node, u32 *naddr, u32 *nsize)
 {
@@ -209,7 +208,7 @@ static int find_range(u32 *reg, u32 *ranges, int nregaddr,
  * In particular, PCI is not supported.  Also, only the beginning of the
  * reg block is tracked; size is ignored except in ranges.
  */
-static u32 dt_xlate_buf[MAX_ADDR_CELLS * MAX_RANGES * 3];
+static u32 prop_buf[MAX_PROP_LEN / 4];
 
 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
                unsigned long *size)
@@ -233,15 +232,15 @@ static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
        offset = (naddr + nsize) * res;
 
        if (reglen < offset + naddr + nsize ||
-           sizeof(dt_xlate_buf) < (offset + naddr + nsize) * 4)
+           MAX_PROP_LEN < (offset + naddr + nsize) * 4)
                return 0;
 
-       copy_val(last_addr, dt_xlate_buf + offset, naddr);
+       copy_val(last_addr, prop_buf + offset, naddr);
 
-       ret_size = dt_xlate_buf[offset + naddr];
+       ret_size = prop_buf[offset + naddr];
        if (nsize == 2) {
                ret_size <<= 32;
-               ret_size |= dt_xlate_buf[offset + naddr + 1];
+               ret_size |= prop_buf[offset + naddr + 1];
        }
 
        for (;;) {
@@ -255,25 +254,25 @@ static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
 
                get_reg_format(parent, &naddr, &nsize);
 
-               buflen = getprop(node, "ranges", dt_xlate_buf,
-                               sizeof(dt_xlate_buf));
+               buflen = getprop(node, "ranges", prop_buf,
+                               sizeof(prop_buf));
                if (buflen == 0)
                        continue;
-               if (buflen < 0 || buflen > sizeof(dt_xlate_buf))
+               if (buflen < 0 || buflen > sizeof(prop_buf))
                        return 0;
 
-               offset = find_range(last_addr, dt_xlate_buf, prev_naddr,
+               offset = find_range(last_addr, prop_buf, prev_naddr,
                                    naddr, prev_nsize, buflen / 4);
 
                if (offset < 0)
                        return 0;
 
-               copy_val(this_addr, dt_xlate_buf + offset, prev_naddr);
+               copy_val(this_addr, prop_buf + offset, prev_naddr);
 
                if (!sub_reg(last_addr, this_addr))
                        return 0;
 
-               copy_val(this_addr, dt_xlate_buf + offset + prev_naddr, naddr);
+               copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
 
                if (!add_reg(last_addr, this_addr, naddr))
                        return 0;
@@ -300,16 +299,35 @@ int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
 {
        int reglen;
 
-       reglen = getprop(node, "reg", dt_xlate_buf, sizeof(dt_xlate_buf)) / 4;
+       reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
        return dt_xlate(node, res, reglen, addr, size);
 }
 
 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
 {
 
-       if (buflen > sizeof(dt_xlate_buf))
+       if (buflen > sizeof(prop_buf))
                return 0;
 
-       memcpy(dt_xlate_buf, buf, buflen);
+       memcpy(prop_buf, buf, buflen);
        return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
 }
+
+int dt_is_compatible(void *node, const char *compat)
+{
+       char *buf = (char *)prop_buf;
+       int len, pos;
+
+       len = getprop(node, "compatible", buf, MAX_PROP_LEN);
+       if (len < 0)
+               return 0;
+
+       for (pos = 0; pos < len; pos++) {
+               if (!strcmp(buf + pos, compat))
+                       return 1;
+
+               pos += strnlen(&buf[pos], len - pos);
+       }
+
+       return 0;
+}

diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h
index aebd6edc9a9017d63348be1d07ba81b0546e0367..a10bf5a153d5f2f726442e360ace6796b4ad3824 100644 (file)
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -87,6 +87,7 @@ void *simple_alloc_init(char *base, unsigned long heap_size,
 extern void flush_cache(void *, unsigned long);
 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size);
 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr);
+int dt_is_compatible(void *node, const char *compat);
 
 static inline void *finddevice(const char *name)
 {