powerpc/mpc85xx: Enabling CPC conditionally based on hwconfig options

If hwconfig does not contains "en_cpc" then by default all cpcs are enabled
If this config is defined then only those individual cpcs which are defined
in the subargument of "en_cpc" will be enabled e.g en_cpc:cpc1,cpc2; (this
will enable cpc1 and cpc2) or en_cpc:cpc2; (this enables just cpc2)

Signed-off-by: Shaveta Leekha <shaveta@freescale.com>
Signed-off-by: Sandeep Singh <Sandeep@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index b237505d3e6092fb6d67395ceca0946e94abfae0..5bfab70b7edbac0d9ca15d124fab619db91c0192 100644 (file)
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -254,12 +254,36 @@ static void enable_tdm_law(void)
 void enable_cpc(void)
 {
        int i;
+       int ret;
        u32 size = 0;
-
+       u32 cpccfg0;
+       char buffer[HWCONFIG_BUFFER_SIZE];
+       char cpc_subarg[16];
+       bool have_hwconfig = false;
+       int cpc_args = 0;
        cpc_corenet_t *cpc = (cpc_corenet_t *)CONFIG_SYS_FSL_CPC_ADDR;
 
+       /* Extract hwconfig from environment */
+       ret = getenv_f("hwconfig", buffer, sizeof(buffer));
+       if (ret > 0) {
+               /*
+                * If "en_cpc" is not defined in hwconfig then by default all
+                * cpcs are enable. If this config is defined then individual
+                * cpcs which have to be enabled should also be defined.
+                * e.g en_cpc:cpc1,cpc2;
+                */
+               if (hwconfig_f("en_cpc", buffer))
+                       have_hwconfig = true;
+       }
+
        for (i = 0; i < CONFIG_SYS_NUM_CPC; i++, cpc++) {
-               u32 cpccfg0 = in_be32(&cpc->cpccfg0);
+               if (have_hwconfig) {
+                       sprintf(cpc_subarg, "cpc%u", i + 1);
+                       cpc_args = hwconfig_sub_f("en_cpc", cpc_subarg, buffer);
+                       if (cpc_args == 0)
+                               continue;
+               }
+               cpccfg0 = in_be32(&cpc->cpccfg0);
                size += CPC_CFG0_SZ_K(cpccfg0);
 
 #ifdef CONFIG_SYS_FSL_ERRATUM_CPC_A002