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>

Documentation/powerpc/dts-bindings/fsl/cpm_qe/qe.txt

@@ -17,6 +17,7 @@ Required properties:
 - model : precise model of the QE, Can be "QE", "CPM", or "CPM2"
 - reg : offset and length of the device registers.
 - bus-frequency : the clock frequency for QUICC Engine.
+- fsl,qe-num-riscs: define how many RISC engines the QE has.
 
 Recommended properties
 - brg-frequency : the internal clock source frequency for baud-rate

arch/powerpc/include/asm/qe.h

@@ -152,6 +152,8 @@ unsigned int qe_get_brg_clk(void);
 int qe_setbrg(enum qe_clock brg, unsigned int rate, unsigned int multiplier);
 int qe_get_snum(void);
 void qe_put_snum(u8 snum);
+unsigned int qe_get_num_of_risc(void);
+
 /* we actually use cpm_muram implementation, define this for convenience */
 #define qe_muram_init cpm_muram_init
 #define qe_muram_alloc cpm_muram_alloc
@@ -231,12 +233,16 @@ struct qe_bd {
 #define QE_ALIGNMENT_OF_PRAM	64
 
 /* RISC allocation */
-enum qe_risc_allocation {
+#define QE_RISC_ALLOCATION_RISC1	0x1  /* RISC 1 */
-	QE_RISC_ALLOCATION_RISC1 = 1,	/* RISC 1 */
+#define QE_RISC_ALLOCATION_RISC2	0x2  /* RISC 2 */
-	QE_RISC_ALLOCATION_RISC2 = 2,	/* RISC 2 */
+#define QE_RISC_ALLOCATION_RISC3	0x4  /* RISC 3 */
-	QE_RISC_ALLOCATION_RISC1_AND_RISC2 = 3	/* Dynamically choose
+#define QE_RISC_ALLOCATION_RISC4	0x8  /* RISC 4 */
-						   RISC 1 or RISC 2 */
+#define QE_RISC_ALLOCATION_RISC1_AND_RISC2	(QE_RISC_ALLOCATION_RISC1 | \
-};
+						 QE_RISC_ALLOCATION_RISC2)
+#define QE_RISC_ALLOCATION_FOUR_RISCS	(QE_RISC_ALLOCATION_RISC1 | \
+					 QE_RISC_ALLOCATION_RISC2 | \
+					 QE_RISC_ALLOCATION_RISC3 | \
+					 QE_RISC_ALLOCATION_RISC4)
 
 /* QE extended filtering Table Lookup Key Size */
 enum qe_fltr_tbl_lookup_key_size {

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);
+