powerpc/qe: update risc allocation for QE

Change the RISC allocation to macros instead of enum, add function to read
the number of risc engines from the new property "fsl,qe-num-riscs" under
the qe node in dts. Add new property "fsl,qe-num-riscs" description in
qe.txt

Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c
index 01bce3784b0a..2533677ae5eb 100644
--- a/arch/powerpc/sysdev/qe_lib/qe.c
+++ b/arch/powerpc/sysdev/qe_lib/qe.c
@@ -575,3 +575,31 @@ struct qe_firmware_info *qe_get_firmware_info(void)
 }
 EXPORT_SYMBOL(qe_get_firmware_info);
 
+unsigned int qe_get_num_of_risc(void)
+{
+        struct device_node *qe;
+        int size;
+        unsigned int num_of_risc = 0;
+        const u32 *prop;
+
+        qe = of_find_compatible_node(NULL, NULL, "fsl,qe");
+        if (!qe) {
+                /* Older devices trees did not have an "fsl,qe"
+                 * compatible property, so we need to look for
+                 * the QE node by name.
+                 */
+                qe = of_find_node_by_type(NULL, "qe");
+                if (!qe)
+                        return num_of_risc;
+        }
+
+        prop = of_get_property(qe, "fsl,qe-num-riscs", &size);
+        if (prop && size == sizeof(*prop))
+                num_of_risc = *prop;
+
+        of_node_put(qe);
+
+        return num_of_risc;
+}
+EXPORT_SYMBOL(qe_get_num_of_risc);
+