hw/misc/mps2-scc: Support configurable number of OSCCLK values

Currently the MPS2 SCC device implements a fixed number of OSCCLK
values (3).  The variant of this device in the MPS3 AN524 board has 6
OSCCLK values.  Switch to using a PROP_ARRAY, which allows board code
to specify how large the OSCCLK array should be as well as its
values.

With a variable-length property array, the SCC no longer specifies
default values for the OSCCLKs, so we must set them explicitly in the
board code.  This defaults are actually incorrect for the an521 and
an505; we will correct this bug in a following patch.

This is a migration compatibility break for all the mps boards.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210215115138.20465-3-peter.maydell@linaro.org

1 files changed, 13 insertions, 11 deletions

diff --git a/hw/misc/mps2-scc.c b/hw/misc/mps2-scc.c
index ce1dfe9..52a4e18 100644
--- a/hw/misc/mps2-scc.c
+++ b/hw/misc/mps2-scc.c
@@ -57,7 +57,7 @@ static bool scc_cfg_write(MPS2SCC *s, unsigned function,
 {
     trace_mps2_scc_cfg_write(function, device, value);
 
-    if (function != 1 || device >= NUM_OSCCLK) {
+    if (function != 1 || device >= s->num_oscclk) {
         qemu_log_mask(LOG_GUEST_ERROR,
                       "MPS2 SCC config write: bad function %d device %d\n",
                       function, device);
@@ -75,7 +75,7 @@ static bool scc_cfg_write(MPS2SCC *s, unsigned function,
 static bool scc_cfg_read(MPS2SCC *s, unsigned function,
                          unsigned device, uint32_t *value)
 {
-    if (function != 1 || device >= NUM_OSCCLK) {
+    if (function != 1 || device >= s->num_oscclk) {
         qemu_log_mask(LOG_GUEST_ERROR,
                       "MPS2 SCC config read: bad function %d device %d\n",
                       function, device);
@@ -227,7 +227,7 @@ static void mps2_scc_reset(DeviceState *dev)
     s->cfgctrl = 0x100000;
     s->cfgstat = 0;
     s->dll = 0xffff0001;
-    for (i = 0; i < NUM_OSCCLK; i++) {
+    for (i = 0; i < s->num_oscclk; i++) {
         s->oscclk[i] = s->oscclk_reset[i];
     }
     for (i = 0; i < ARRAY_SIZE(s->led); i++) {
@@ -254,12 +254,14 @@ static void mps2_scc_realize(DeviceState *dev, Error **errp)
                                       LED_COLOR_GREEN, name);
         g_free(name);
     }
+
+    s->oscclk = g_new0(uint32_t, s->num_oscclk);
 }
 
 static const VMStateDescription mps2_scc_vmstate = {
     .name = "mps2-scc",
-    .version_id = 1,
-    .minimum_version_id = 1,
+    .version_id = 2,
+    .minimum_version_id = 2,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(cfg0, MPS2SCC),
         VMSTATE_UINT32(cfg1, MPS2SCC),
@@ -268,7 +270,8 @@ static const VMStateDescription mps2_scc_vmstate = {
         VMSTATE_UINT32(cfgctrl, MPS2SCC),
         VMSTATE_UINT32(cfgstat, MPS2SCC),
         VMSTATE_UINT32(dll, MPS2SCC),
-        VMSTATE_UINT32_ARRAY(oscclk, MPS2SCC, NUM_OSCCLK),
+        VMSTATE_VARRAY_UINT32(oscclk, MPS2SCC, num_oscclk,
+                              0, vmstate_info_uint32, uint32_t),
         VMSTATE_END_OF_LIST()
     }
 };
@@ -280,14 +283,13 @@ static Property mps2_scc_properties[] = {
     DEFINE_PROP_UINT32("scc-cfg4", MPS2SCC, cfg4, 0),
     DEFINE_PROP_UINT32("scc-aid", MPS2SCC, aid, 0),
     DEFINE_PROP_UINT32("scc-id", MPS2SCC, id, 0),
-    /* These are the initial settings for the source clocks on the board.
+    /*
+     * These are the initial settings for the source clocks on the board.
      * In hardware they can be configured via a config file read by the
      * motherboard configuration controller to suit the FPGA image.
-     * These default values are used by most of the standard FPGA images.
      */
-    DEFINE_PROP_UINT32("oscclk0", MPS2SCC, oscclk_reset[0], 50000000),
-    DEFINE_PROP_UINT32("oscclk1", MPS2SCC, oscclk_reset[1], 24576000),
-    DEFINE_PROP_UINT32("oscclk2", MPS2SCC, oscclk_reset[2], 25000000),
+    DEFINE_PROP_ARRAY("oscclk", MPS2SCC, num_oscclk, oscclk_reset,
+                      qdev_prop_uint32, uint32_t),
     DEFINE_PROP_END_OF_LIST(),
 };