arm: rpi: Add a file to handle messages

The bcm283x chips provide a way for the ARM core to communicate with the
graphics processor, which is in charge of many things. This is handled by
way of a message prototcol.

At present the code for sending message (and receiving a reply) is spread
around U-Boot, primarily in the board file. This means that sending a
message from a driver requires duplicating the code.

Create a new message implementation with a function to support powering on
a subsystem as a starting point.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-bcm283x/Makefile

@@ -5,4 +5,4 @@
 #
 
 obj-$(CONFIG_BCM2835) += lowlevel_init.o
-obj-y	+= init.o reset.o mbox.o phys2bus.o
+obj-y	+= init.o reset.o mbox.o msg.o phys2bus.o

arch/arm/mach-bcm283x/include/mach/msg.h

@@ -0,0 +1,18 @@
+/*
+ * (C) Copyright 2012,2015 Stephen Warren
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _BCM2835_MSG_H
+#define _BCM2835_MSG_H
+
+/**
+ * bcm2835_power_on_module() - power on an SoC module
+ *
+ * @module: ID of module to power on (BCM2835_MBOX_POWER_DEVID_...)
+ * @return 0 if OK, -EIO on error
+ */
+int bcm2835_power_on_module(u32 module);
+
+#endif

arch/arm/mach-bcm283x/msg.c

@@ -0,0 +1,39 @@
+/*
+ * (C) Copyright 2012 Stephen Warren
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <memalign.h>
+#include <asm/arch/mbox.h>
+
+struct msg_set_power_state {
+	struct bcm2835_mbox_hdr hdr;
+	struct bcm2835_mbox_tag_set_power_state set_power_state;
+	u32 end_tag;
+};
+
+int bcm2835_power_on_module(u32 module)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
+	int ret;
+
+	BCM2835_MBOX_INIT_HDR(msg_pwr);
+	BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
+			      SET_POWER_STATE);
+	msg_pwr->set_power_state.body.req.device_id = module;
+	msg_pwr->set_power_state.body.req.state =
+		BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
+		BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
+
+	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
+				     &msg_pwr->hdr);
+	if (ret) {
+		printf("bcm2835: Could not set module %u power state\n",
+		       module);
+		return -EIO;
+	}
+
+	return 0;
+}

board/raspberrypi/rpi/rpi.c

@@ -16,6 +16,7 @@
 #include <mmc.h>
 #include <asm/gpio.h>
 #include <asm/arch/mbox.h>
+#include <asm/arch/msg.h>
 #include <asm/arch/sdhci.h>
 #include <asm/global_data.h>
 #include <dm/platform_data/serial_bcm283x_mu.h>
@@ -53,12 +54,6 @@ struct msg_get_mac_address {
 	u32 end_tag;
 };
 
-struct msg_set_power_state {
-	struct bcm2835_mbox_hdr hdr;
-	struct bcm2835_mbox_tag_set_power_state set_power_state;
-	u32 end_tag;
-};
-
 struct msg_get_clock_rate {
 	struct bcm2835_mbox_hdr hdr;
 	struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
@@ -365,30 +360,6 @@ int misc_init_r(void)
 	return 0;
 }
 
-static int power_on_module(u32 module)
-{
-	ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
-	int ret;
-
-	BCM2835_MBOX_INIT_HDR(msg_pwr);
-	BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
-			      SET_POWER_STATE);
-	msg_pwr->set_power_state.body.req.device_id = module;
-	msg_pwr->set_power_state.body.req.state =
-		BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
-		BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
-
-	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
-				     &msg_pwr->hdr);
-	if (ret) {
-		printf("bcm2835: Could not set module %u power state\n",
-		       module);
-		return -1;
-	}
-
-	return 0;
-}
-
 static void get_board_rev(void)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
@@ -492,7 +463,7 @@ int board_init(void)
 
 	gd->bd->bi_boot_params = 0x100;
 
-	return power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
+	return bcm2835_power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
 }
 
 int board_mmc_init(bd_t *bis)
@@ -500,7 +471,7 @@ int board_mmc_init(bd_t *bis)
 	ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1);
 	int ret;
 
-	power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI);
+	bcm2835_power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI);
 
 	BCM2835_MBOX_INIT_HDR(msg_clk);
 	BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE);