[PULL 13/38] ppc440_sdram: Get rid of the init RAM hack

[Daniel Henrique Barboza <danielhb413@gmail.com>]

From: BALATON Zoltan <balaton@eik.bme.hu>

Remove the do_init parameter of ppc440_sdram_init and enable SDRAM
controller from the board. Firmware does this so it may only be needed
when booting with -kernel without firmware but we enable SDRAM
unconditionally to preserve previous behaviour.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <c2eda8f83c82f655aa7821a5a8c9310484bd6a1d.1664021647.git.balaton@eik.bme.hu>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/ppc/ppc440.h         |  3 +--
 hw/ppc/ppc440_uc.c      | 15 +++++++++------
 hw/ppc/sam460ex.c       |  4 +++-
 include/hw/ppc/ppc4xx.h |  2 ++
 4 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/hw/ppc/ppc440.h b/hw/ppc/ppc440.h
index e6c905b7d6..01d76b8000 100644
--- a/hw/ppc/ppc440.h
+++ b/hw/ppc/ppc440.h
@@ -17,8 +17,7 @@ void ppc4xx_l2sram_init(CPUPPCState *env);
 void ppc4xx_cpr_init(CPUPPCState *env);
 void ppc4xx_sdr_init(CPUPPCState *env);
 void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       Ppc4xxSdramBank *ram_banks,
-                       int do_init);
+                       Ppc4xxSdramBank *ram_banks);
 void ppc4xx_ahb_init(CPUPPCState *env);
 void ppc4xx_dma_init(CPUPPCState *env, int dcr_base);
 void ppc460ex_pcie_init(CPUPPCState *env);
diff --git a/hw/ppc/ppc440_uc.c b/hw/ppc/ppc440_uc.c
index 3fbfe4ad13..e8bc088c8f 100644
--- a/hw/ppc/ppc440_uc.c
+++ b/hw/ppc/ppc440_uc.c
@@ -16,6 +16,7 @@
 #include "qemu/module.h"
 #include "hw/irq.h"
 #include "exec/memory.h"
+#include "cpu.h"
 #include "hw/ppc/ppc4xx.h"
 #include "hw/qdev-properties.h"
 #include "hw/pci/pci.h"
@@ -727,12 +728,11 @@ static void sdram_reset(void *opaque)
     ppc440_sdram_t *sdram = opaque;
 
     sdram->addr = 0;
-    sdram->mcopt2 = SDRAM_DDR2_MCOPT2_DCEN;
+    sdram->mcopt2 = 0;
 }
 
 void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       Ppc4xxSdramBank *ram_banks,
-                       int do_init)
+                       Ppc4xxSdramBank *ram_banks)
 {
     ppc440_sdram_t *sdram;
     int i;
@@ -749,9 +749,6 @@ void ppc440_sdram_init(CPUPPCState *env, int nbanks,
                      sdram, &dcr_read_sdram, &dcr_write_sdram);
     ppc_dcr_register(env, SDRAM0_CFGDATA,
                      sdram, &dcr_read_sdram, &dcr_write_sdram);
-    if (do_init) {
-        sdram_map_bcr(sdram);
-    }
 
     ppc_dcr_register(env, SDRAM_R0BAS,
                      sdram, &dcr_read_sdram, &dcr_write_sdram);
@@ -773,6 +770,12 @@ void ppc440_sdram_init(CPUPPCState *env, int nbanks,
                      sdram, &dcr_read_sdram, &dcr_write_sdram);
 }
 
+void ppc440_sdram_enable(CPUPPCState *env)
+{
+    ppc_dcr_write(env->dcr_env, SDRAM0_CFGADDR, 0x21);
+    ppc_dcr_write(env->dcr_env, SDRAM0_CFGDATA, 0x08000000);
+}
+
 /*****************************************************************************/
 /* PLB to AHB bridge */
 enum {
diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
index f4c2a693fb..9c01211b20 100644
--- a/hw/ppc/sam460ex.c
+++ b/hw/ppc/sam460ex.c
@@ -345,7 +345,9 @@ static void sam460ex_init(MachineState *machine)
     ppc4xx_sdram_banks(machine->ram, 1, ram_banks, ppc460ex_sdram_bank_sizes);
 
     /* FIXME: does 460EX have ECC interrupts? */
-    ppc440_sdram_init(env, 1, ram_banks, 1);
+    ppc440_sdram_init(env, 1, ram_banks);
+    /* Enable SDRAM memory regions as we may boot without firmware */
+    ppc440_sdram_enable(env);
 
     /* IIC controllers and devices */
     dev = sysbus_create_simple(TYPE_PPC4xx_I2C, 0x4ef600700,
diff --git a/include/hw/ppc/ppc4xx.h b/include/hw/ppc/ppc4xx.h
index 558500fb97..78a845399e 100644
--- a/include/hw/ppc/ppc4xx.h
+++ b/include/hw/ppc/ppc4xx.h
@@ -37,6 +37,8 @@ typedef struct {
     uint32_t bcr;
 } Ppc4xxSdramBank;
 
+void ppc440_sdram_enable(CPUPPCState *env);
+
 void ppc4xx_sdram_banks(MemoryRegion *ram, int nr_banks,
                         Ppc4xxSdramBank ram_banks[],
                         const ram_addr_t sdram_bank_sizes[]);
-- 
2.37.3