[PATCH v4 9/9] mac_oldworld: Add SPD data to cover RAM

[BALATON Zoltan]

OpenBIOS gets RAM size via fw_cfg but rhe original board firmware
detects RAM using SPD data so generate and add SDP eeproms to cover as
much RAM as possible to describe with SPD (this may be less than the
actual ram_size due to SDRAM size constraints).

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 hw/ppc/mac_oldworld.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/mac_oldworld.c b/hw/ppc/mac_oldworld.c
index 53615af6b1..1f85859034 100644
--- a/hw/ppc/mac_oldworld.c
+++ b/hw/ppc/mac_oldworld.c
@@ -34,6 +34,7 @@
 #include "hw/input/adb.h"
 #include "sysemu/sysemu.h"
 #include "net/net.h"
+#include "hw/i2c/smbus_eeprom.h"
 #include "hw/isa/isa.h"
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_host.h"
@@ -137,6 +138,8 @@ static void ppc_heathrow_init(MachineState *machine)
     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
     void *fw_cfg;
     uint64_t tbfreq;
+    uint8_t *spd_data[3] = {};
+    I2CBus *i2c_bus;
 
     linux_boot = (kernel_filename != NULL);
 
@@ -156,8 +159,16 @@ static void ppc_heathrow_init(MachineState *machine)
                      "maximum 2047 MB", ram_size / MiB);
         exit(1);
     }
-
     memory_region_add_subregion(sysmem, 0, machine->ram);
+    for (i = 0; i < 3; i++) {
+        int size_left = ram_size - i * 512 * MiB;
+        if (size_left > 0) {
+            uint32_t s = size_left / MiB;
+            s = (s > 512 ? 512 : s);
+            s = 1U << (31 - clz32(s));
+            spd_data[i] = spd_data_generate(SDR, s * MiB);
+        }
+    }
 
     /* allocate and load firmware ROM */
     memory_region_init_rom(bios, NULL, "ppc_heathrow.bios", PROM_SIZE,
@@ -340,6 +351,12 @@ static void ppc_heathrow_init(MachineState *machine)
     macio_ide_init_drives(macio_ide, &hd[MAX_IDE_DEVS]);
 
     dev = DEVICE(object_resolve_path_component(OBJECT(macio), "cuda"));
+    i2c_bus = I2C_BUS(qdev_get_child_bus(dev, "i2c"));
+    for (i = 0; i < 3; i++) {
+        if (spd_data[i]) {
+            smbus_eeprom_init_one(i2c_bus, 0x50 + i, spd_data[i]);
+        }
+    }
     adb_bus = qdev_get_child_bus(dev, "adb.0");
     dev = qdev_create(adb_bus, TYPE_ADB_KEYBOARD);
     qdev_init_nofail(dev);
-- 
2.21.3