aboutsummaryrefslogtreecommitdiff
path: root/src/graphics/mbox.c
diff options
context:
space:
mode:
authorChristian Cunningham <cc@localhost>2022-03-24 09:38:08 -0700
committerChristian Cunningham <cc@localhost>2022-03-24 09:38:08 -0700
commit93bf62580a68533dc8252b9a2a055c02f34ecb67 (patch)
tree1b1ca92ebbe107a998136a1442c0dba5be885e13 /src/graphics/mbox.c
parent3e64dda5d5c350cc325650133f7e64967f1efe84 (diff)
Modularized
Diffstat (limited to 'src/graphics/mbox.c')
-rw-r--r--src/graphics/mbox.c37
1 files changed, 0 insertions, 37 deletions
diff --git a/src/graphics/mbox.c b/src/graphics/mbox.c
deleted file mode 100644
index 0dac497..0000000
--- a/src/graphics/mbox.c
+++ /dev/null
@@ -1,37 +0,0 @@
-#include <symbols.h>
-
-/* mailbox message buffer */
-volatile unsigned int __attribute__((aligned(16))) mbox[36];
-
-#define VIDEOCORE_MBOX (MMIO_BASE+0x0000B880)
-#define MBOX_READ ((volatile unsigned int*)(VIDEOCORE_MBOX+0x0))
-#define MBOX_POLL ((volatile unsigned int*)(VIDEOCORE_MBOX+0x10))
-#define MBOX_SENDER ((volatile unsigned int*)(VIDEOCORE_MBOX+0x14))
-#define MBOX_STATUS ((volatile unsigned int*)(VIDEOCORE_MBOX+0x18))
-#define MBOX_CONFIG ((volatile unsigned int*)(VIDEOCORE_MBOX+0x1C))
-#define MBOX_WRITE ((volatile unsigned int*)(VIDEOCORE_MBOX+0x20))
-#define MBOX_RESPONSE 0x80000000
-#define MBOX_FULL 0x80000000
-#define MBOX_EMPTY 0x40000000
-
-/**
- * Make a mailbox call. Returns 0 on failure, non-zero on success
- */
-int mbox_call(unsigned char ch)
-{
- unsigned int r = (((unsigned int)((unsigned long)&mbox)&~0xF) | (ch&0xF));
- /* wait until we can write to the mailbox */
- do{asm volatile("nop");}while(*MBOX_STATUS & MBOX_FULL);
- /* write the address of our message to the mailbox with channel identifier */
- *MBOX_WRITE = r;
- /* now wait for the response */
- while(1) {
- /* is there a response? */
- do{asm volatile("nop");}while(*MBOX_STATUS & MBOX_EMPTY);
- /* is it a response to our message? */
- if(r == *MBOX_READ)
- /* is it a valid successful response? */
- return mbox[1]==MBOX_RESPONSE;
- }
- return 0;
-}