enable i2c pins when controlling bmc i2c controller from host.

Don't assume i2c pin are left enabled by BMC when taking control. Adjust SCU register if required.
lprylli · Mar 19, 2020 · 47f167e · 47f167e
1 parent 5effc70
commit 47f167e
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/ast/i2c.go b/ast/i2c.go
@@ -71,6 +71,16 @@ func (a *AstHandle) I2cDev(busno, slave int) i2c.Dev {
 		bus.m.Write32(bus.base+0, 0)
 		time.Sleep(100 * time.Millisecond)
 	}
+	if busno >= 2 && busno <= 13 {
+		scuBit := uint32(1) << uint(busno+16-2)
+		if a.scu.Read32(0x90)&scuBit == 0 {
+			a.scu.Write32(0x90, a.scu.Read32(0x90)|scuBit)
+			log.Printf("i2c %d pins were disabled, enabling...\n", busno)
+		}
+	}
+	if bus.m.Read32(bus.base+0x14) != 0x0a060000 {
+		log.Fatalf("Cannot initialize i2c, cmd = 0x%08x\n", bus.m.Read32(bus.base+0x14))
+	}
 	bus.m.Write32(bus.base, 1) // enable master func
 	return i2c.Dev{Bus: bus, Addr: uint16(slave)}
 }

diff --git a/cmds/asti2c/asti2c.go b/cmds/asti2c/asti2c.go
@@ -23,7 +23,7 @@ func idt_eeread(dev i2c.Dev, addr uint32) byte {
 	tx := []byte{0x47, 4, 1, 0, byte(addr % 256), byte(addr / 256)}
 	err := dev.Tx(tx, nil)
 	if err != nil {
-		log.Fatalf("idt_eeread:query-phase:%d\n", err)
+		log.Fatalf("idt_eeread:query-phase:%s\n", err)
 	}
 	var rbuf [8]byte
 	err = dev.Tx([]byte{0x47}, rbuf[:])