From 4db2ac5c9f9b50dad488ba9d8c75d435ad30247f Mon Sep 17 00:00:00 2001
From: Vladimir Prus <address@hidden>
Date: Thu, 2 Apr 2009 20:44:01 +0400
Subject: [PATCH 3/6] Support 7785's serial.


Signed-off-by: Vladimir Prus <address@hidden>
---
 hw/sh.h        |    1 +
 hw/sh_serial.c |   58 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/hw/sh.h b/hw/sh.h
index 5e3c22b..da051f1 100644
--- a/hw/sh.h
+++ b/hw/sh.h
@@ -37,6 +37,7 @@ void tmu012_init(target_phys_addr_t base, int feat, uint32_t freq,
 
 /* sh_serial.c */
 #define SH_SERIAL_FEAT_SCIF (1 << 0)
+#define SH_SERIAL_FEAT_7785 (1 << 1)
 void sh_serial_init (target_phys_addr_t base, int feat,
 		     uint32_t freq, CharDriverState *chr,
 		     qemu_irq eri_source,
diff --git a/hw/sh_serial.c b/hw/sh_serial.c
index fc7de72..2881b5c 100644
--- a/hw/sh_serial.c
+++ b/hw/sh_serial.c
@@ -158,10 +158,22 @@ static void sh_serial_ioport_write(void *opaque, uint32_t offs, uint32_t val)
             }
 
             return;
-        case 0x20: /* SPTR */
-            s->sptr = val & 0xf3;
+        case 0x20: 
+            if (s->feat & SH_SERIAL_FEAT_7785)  {
+                /* Recieve fifo data count register, not writable.  */
+            } else {
+                 /* SPTR */
+                s->sptr = val & 0xf3;
+            }
+            return;
+        case 0x24: 
+            if (s->feat & SH_SERIAL_FEAT_7785) {
+                s->sptr = val & 0xf3;
+            } else {
+               /* LSR */
+            }
             return;
-        case 0x24: /* LSR */
+        case 0x28:
             return;
         }
     }
@@ -240,12 +252,38 @@ static uint32_t sh_serial_ioport_read(void *opaque, uint32_t offs)
             break;
 #endif
         case 0x1c:
-            ret = s->rx_cnt;
+            if (s->feat & SH_SERIAL_FEAT_7785) {
+                /* Trasmit fifo data count.  Because we immediate send
+                   everything, we also claim the fifo is always empty.  */
+                ret = 0;
+            } else {
+                /* On 7751, this is unified receive/trasmit fifo data
+                   count register.  The received data count is in low
+                   8 bits. In QEMU, transmit fifo is always empty, so
+                   return just receive count.  */
+                ret = s->rx_cnt;
+            }
             break;
         case 0x20:
-            ret = s->sptr;
+            if (s->feat & SH_SERIAL_FEAT_7785) {
+                /* On 7785, there's separate trasmit fifo data register.  */
+                ret = s->rx_cnt;
+            } else {
+                ret = s->sptr;
+            }
             break;
         case 0x24:
+            /* On 7785, this is serial port register.  On 7751, this is line
+               status register.  */
+            if (s->feat & SH_SERIAL_FEAT_7785) {
+                ret = s->sptr;
+            } else {
+                ret = 0;
+            }
+            break;
+        case 0x28:
+            /* On 7785, this is line status register.  */
+            assert(s->feat & SH_SERIAL_FEAT_7785);
             ret = 0;
             break;
         }
@@ -367,6 +405,7 @@ void sh_serial_init (target_phys_addr_t base, int feat,
 {
     sh_serial_state *s;
     int s_io_memory;
+    int is_7785 = (feat & SH_SERIAL_FEAT_7785);
 
     s = qemu_mallocz(sizeof(sh_serial_state));
 
@@ -386,14 +425,17 @@ void sh_serial_init (target_phys_addr_t base, int feat,
         s->dr = 0xff;
     }
 
-    s->rx_capacity = 16;
+    s->rx_capacity = is_7785 ? 64 : 16;
     s->rx_fifo = (uint8_t *)malloc(s->rx_capacity);
     sh_serial_clear_fifo(s);
 
     s_io_memory = cpu_register_io_memory(0, sh_serial_readfn,
 					 sh_serial_writefn, s);
-    cpu_register_physical_memory(P4ADDR(base), 0x28, s_io_memory);
-    cpu_register_physical_memory(A7ADDR(base), 0x28, s_io_memory);
+    cpu_register_physical_memory(P4ADDR(base), 
+                                 is_7785 ? 0x2E : 0x28, s_io_memory);
+    cpu_register_physical_memory(A7ADDR(base), 
+                                 is_7785 ? 0x2E : 0x28, s_io_memory);
+
 
     s->chr = chr;
 
-- 
1.6.2.1