[PULL 35/46] hw/arm/raspi: Extract the version from the board revision

[Peter Maydell <peter.maydell@linaro.org>]

From: Philippe Mathieu-Daudé <f4bug@amsat.org>

The board revision encode the board version. Add a helper
to extract the version, and use it.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20200208165645.15657-4-f4bug@amsat.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/raspi.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/hw/arm/raspi.c b/hw/arm/raspi.c
index 818146fdbb2..f285e2988fc 100644
--- a/hw/arm/raspi.c
+++ b/hw/arm/raspi.c
@@ -16,6 +16,7 @@
 #include "qapi/error.h"
 #include "cpu.h"
 #include "hw/arm/bcm2836.h"
+#include "hw/registerfields.h"
 #include "qemu/error-report.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
@@ -37,6 +38,28 @@ typedef struct RasPiState {
     MemoryRegion ram;
 } RasPiState;
 
+/*
+ * Board revision codes:
+ * www.raspberrypi.org/documentation/hardware/raspberrypi/revision-codes/
+ */
+FIELD(REV_CODE, REVISION,           0, 4);
+FIELD(REV_CODE, TYPE,               4, 8);
+FIELD(REV_CODE, PROCESSOR,         12, 4);
+FIELD(REV_CODE, MANUFACTURER,      16, 4);
+FIELD(REV_CODE, MEMORY_SIZE,       20, 3);
+FIELD(REV_CODE, STYLE,             23, 1);
+
+static int board_processor_id(uint32_t board_rev)
+{
+    assert(FIELD_EX32(board_rev, REV_CODE, STYLE)); /* Only new style */
+    return FIELD_EX32(board_rev, REV_CODE, PROCESSOR);
+}
+
+static int board_version(uint32_t board_rev)
+{
+    return board_processor_id(board_rev) + 1;
+}
+
 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
 {
     static const uint32_t smpboot[] = {
@@ -164,9 +187,10 @@ static void setup_boot(MachineState *machine, int version, size_t ram_size)
     arm_load_kernel(ARM_CPU(first_cpu), machine, &binfo);
 }
 
-static void raspi_init(MachineState *machine, int version)
+static void raspi_init(MachineState *machine, uint32_t board_rev)
 {
     RasPiState *s = g_new0(RasPiState, 1);
+    int version = board_version(board_rev);
     uint32_t vcram_size;
     DriveInfo *di;
     BlockBackend *blk;
@@ -192,7 +216,6 @@ static void raspi_init(MachineState *machine, int version)
     /* Setup the SOC */
     object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
                                    &error_abort);
-    int board_rev = version == 3 ? 0xa02082 : 0xa21041;
     object_property_set_int(OBJECT(&s->soc), board_rev, "board-rev",
                             &error_abort);
     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
@@ -216,7 +239,7 @@ static void raspi_init(MachineState *machine, int version)
 
 static void raspi2_init(MachineState *machine)
 {
-    raspi_init(machine, 2);
+    raspi_init(machine, 0xa21041);
 }
 
 static void raspi2_machine_init(MachineClass *mc)
@@ -238,7 +261,7 @@ DEFINE_MACHINE("raspi2", raspi2_machine_init)
 #ifdef TARGET_AARCH64
 static void raspi3_init(MachineState *machine)
 {
-    raspi_init(machine, 3);
+    raspi_init(machine, 0xa02082);
 }
 
 static void raspi3_machine_init(MachineClass *mc)
-- 
2.20.1