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mailbox.c
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mailbox.c
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/*
This program is based on the information on
https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
*/
#include "mailbox.h"
#include "mylib.h"
#define flushcache() asm volatile \
("mcr p15, #0, %[zero], c7, c14, #0" : : [zero] "r" (0) )
/*
#define dmb() asm volatile \
("mcr p15, #0, %[zero], c7, c10, #5" : : [zero] "r" (0) )
#define dsb() asm volatile \
("mcr p15, #0, %[zero], c7, c10, #4" : : [zero] "r" (0) )
*/
int mailbox_write(uint32_t value, uint32_t channel) {
volatile uint32_t sta;
volatile uint32_t cmd;
// printf("Write start. Channel: %0d\n", channel);
// printf("Write Value: 0x%08x\n", value);
if ((value & 0x0000000F) != 0) {
return -1;
}
if ((channel & 0xFFFFFFF0) != 0) {
return -1;
}
cmd = 0;
do {
// dmb();
sta = *( (volatile uint32_t *) MB_STATUS);
} while ((sta & 0x80000000) != 0);
// printf("status: 0x%08x\n", sta);
// dmb();
cmd = value | channel;
*((volatile uint32_t *) MB_WRITE) = cmd;
// printf("Command: 0x%08x is written to mail box\n", cmd);
return 0;
}
int mailbox_read(uint32_t channel, uint32_t *value) {
uint32_t mail, sta;
// printf("Read Start. Channel: %d\n", channel);
if ((channel & 0xFFFFFFF0) != 0) {
printf("Channel %d is wrong\n", (int) channel);
return -1;
}
do {
do {
// dmb();
sta = *( (volatile uint32_t *) MB_STATUS);
} while (sta & 0x40000000);
// printf("status: 0x%08x\n", sta);
mail = *( (volatile uint32_t *) MB_READ);
// printf("mail: 0x%08x\n", mail);
} while ((mail & 0x0000000F) != channel);
// dmb();
*value = mail & 0xFFFFFFF0;
return 0;
}
int mailbox_getClockRate(int id)
{
// id: 1: emmc, 2: uart, 3: arm, 4: core, 5: v3d
// 6: h264, 7: ISP, 8: SDRAM, 9: PIXEL, a: PWM
int i;
uint32_t addr;
uint32_t mail;
uint32_t pt[8192] __attribute__((aligned(16)));
int pt_index;
for(i=0; i<8192; i++) {
pt[i]=0;
}
pt[ 0] = 12; // placeholder for the total size
pt[ 1] = 0; // Request code: process request
pt_index=2;
pt[pt_index++] = 0x00030002; // tag identifeir = 0x00030002: get clock rate)
pt[pt_index++] = 8; // value buffer size in bytes ((1 entry)*4)
pt[pt_index++] = 0; // 1bit request/response (0/1), 31bit value length in bytes
pt[pt_index++] = 1; // id = 2
pt[pt_index++] = 0; // return value 2
pt[pt_index++] = 0; // stop tag
pt[0] = pt_index*4;
addr = ((unsigned int) pt) + 0x40000000;
// printf("mailbox addr: 0x%08x\n", (unsigned int) addr);
// for(i=0; i<*((uint32_t *) pt)/4; i++) {
// printf("%08x: %08x\n", (unsigned char *) (pt+i), *((uint32_t *) (pt+i)));
// }
// printf("request to channel 8\n");
mailbox_write(addr, 8);
// printf("read from channel 8\n");
mailbox_read(8, &mail);
// printf("mailbox return value: 0x%08x\n", (unsigned int) mail);
// for(i=0; i<*((uint32_t *) mail)/4; i++) {
// printf("%08x: %08x\n", (unsigned char *) (mail+4*i), *((uint32_t *) (mail+4*i)));
// }
if (*((volatile unsigned int *) (mail+4)) == 0x80000000) {
// printf("Get clock rate (ID=%d) successful\n", *((volatile unsigned int *) (mail+5*4)));
// printf("Clock rate: %d\n", *((volatile unsigned int *) (mail+6*4)));
return *((volatile unsigned int *) (mail+6*4));
} else {
printf("Error: ID=%d\n", *((volatile unsigned int *) (mail+5*4)));
printf("response: 0x%08x\n", *((volatile unsigned int *) (mail+6*4)));
}
return -1;
}
int mailbox_getMemorySize()
{
int i;
uint32_t addr;
uint32_t mail;
uint32_t pt[8192] __attribute__((aligned(16)));
int pt_index;
for(i=0; i<8192; i++) {
pt[i]=0;
}
pt[ 0] = 12; // placeholder for the total size
pt[ 1] = 0; // Request code: process request
pt_index=2;
pt[pt_index++] = 0x00010005; // tag identifeir = 0x00030002: get clock rate)
pt[pt_index++] = 8; // value buffer size in bytes ((1 entry)*4)
pt[pt_index++] = 0; // 1bit request/response (0/1), 31bit value length in bytes
pt[pt_index++] = 0; // return data (base address in bytes)
pt[pt_index++] = 0; // return data (size in bytes)
pt[pt_index++] = 0; // stop tag (unnecessary if initialized with zero. Just in case)
pt[0] = pt_index*4;
addr = ((unsigned int) pt) + 0x40000000;
// printf("mailbox addr: 0x%08x\n", (unsigned int) addr);
// for(i=0; i<*((uint32_t *) pt)/4; i++) {
// printf("%08x: %08x\n", (unsigned char *) (pt+i), *((uint32_t *) (pt+i)));
// }
// printf("request to channel 8\n");
mailbox_write(addr, 8);
// printf("read from channel 8\n");
mailbox_read(8, &mail);
// dmb();
// printf("mailbox return value: 0x%08x\n", (unsigned int) mail);
// for(i=0; i<*((uint32_t *) mail)/4; i++) {
// printf("%08x: %08x\n", (unsigned char *) (mail+4*i), *((uint32_t *) (mail+4*i)));
// }
if (*((uint32_t *) (mail+20)) != 0) {
printf("Error: ARM memory base address is not zero. %08x\n", *((uint32_t *) (mail+20)));
// _hangup();
}
if (*((uint32_t *) (mail+4)) == 0x80000000) {
return *((uint32_t *) (mail+24));
} else {
return -1;
}
}
int mailbox_emmc_clock(int id)
{
int i;
uint32_t addr;
uint32_t mail;
uint32_t pt[8192] __attribute__((aligned(16)));
int pt_index;
for(i=0; i<8192; i++) {
pt[i]=0;
}
pt[ 0] = 12; // placeholder for the total size
pt[ 1] = 0; // Request code: process request
pt_index=2;
pt[pt_index++] = 0x00038002; // tag identifeir = 0x00030002: get clock rate)
pt[pt_index++] = 12; // value buffer size in bytes ((1 entry)*4)
pt[pt_index++] = 0; // 1bit request/response (0/1), 31bit value length in bytes
pt[pt_index++] = id; // clock id (1=emmc)
pt[pt_index++] = 100000000; // clock =100 M MHz
pt[pt_index++] = 0; // skip setting turbo
pt[pt_index++] = 0; // stop tag (unnecessary if initialized with zero. Just in case)
pt[0] = pt_index*4;
addr = ((unsigned int) pt) + 0x40000000;
// printf("mailbox addr: 0x%08x\n", (unsigned int) addr);
// for(i=0; i<*((uint32_t *) pt)/4; i++) {
// printf("%08x: %08x\n", (unsigned char *) (pt+i), *((uint32_t *) (pt+i)));
// }
// printf("request to channel 8\n");
mailbox_write(addr, 8);
// printf("read from channel 8\n");
mailbox_read(8, &mail);
// dmb();
// printf("mailbox return value: 0x%08x\n", (unsigned int) mail);
// for(i=0; i<*((uint32_t *) mail)/4; i++) {
// printf("%08x: %08x\n", (unsigned char *) (mail+4*i), *((uint32_t *) (mail+4*i)));
// }
if (*((uint32_t *) (mail+4)) == 0x80000000) {
return 0;
} else {
return -1;
}
}