ipq806x: load and start RPM

This patch finds the RPM image in the CBFS, loads it as defined by the
MBN header and signals to the RPM processor where the image is
located and waits for confirmation of the RPM starting.

The interactions with the RPM processor are copied as is from the
vendor provided sample code.

Debug messages added to help identify problems with loading the blobs,
should they ever happen.

BRANCH=storm
BUG=chrome-os-partner:34161
TEST=ramstage reports both TZBSP and RPM starting.

Change-Id: I81e86684f9d1b614f2059ee82c6561f9484605de
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: bbf2eda04a6e72b4f7b780f493b5a1cea0abfeb7
Original-Change-Id: Ic10af0744574c0eca9b5ab7567808c1b8d7fe0c2
Original-Signed-off-by: Vikas Das <vdas@codeaurora.org>
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/236661
Original-Reviewed-by: Varadarajan Narayanan <varada@qti.qualcomm.com>
Reviewed-on: http://review.coreboot.org/9692
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/storm/mainboard.c

@@ -111,6 +111,7 @@ static void assert_sw_reset(void)
 static void mainboard_init(device_t dev)
 {
 	 start_tzbsp();
+	 start_rpm();
 	 setup_mmu();
 	 setup_usb();
 	 assert_sw_reset();

src/soc/qualcomm/ipq806x/blobs_init.c

@@ -2,6 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright 2014 Google Inc.
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,13 +18,15 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include <cbfs.h>
-#include <string.h>
 #include <arch/cache.h>
-
-#include <soc/soc_services.h>
-
+#include <arch/io.h>
+#include <cbfs.h>
 #include <console/console.h>
+#include <string.h>
+#include <timer.h>
+
+#include <soc/iomap.h>
+#include <soc/soc_services.h>
 
 #include "mbn_header.h"
 
@@ -93,7 +96,43 @@ void start_tzbsp(void)
 	if (!tzbsp)
 		die("could not find or map TZBSP\n");
 
+	printk(BIOS_INFO, "Starting TZBSP\n");
+
 	tz_init_wrapper(0, 0, tzbsp);
 }
 
+void start_rpm(void)
+{
+	u32 load_addr;
+	u32 ready_mask = 1 << 10;
+	struct stopwatch sw;
+
+	if (readl(RPM_SIGNAL_COOKIE) == RPM_FW_MAGIC_NUM) {
+		printk(BIOS_INFO, "RPM appears to have already started\n");
+		return;
+	}
+
+	load_addr = (u32) load_ipq_blob("rpm.mbn");
+	if (!load_addr)
+		die("could not find or map RPM code\n");
+
+	printk(BIOS_INFO, "Starting RPM\n");
+
+	/* Clear 'ready' indication. */
+	writel(readl(RPM_INT_ACK) & ~ready_mask, RPM_INT_ACK);
+
+	/* Set RPM entry address */
+	writel(load_addr, RPM_SIGNAL_ENTRY);
+	/* Set cookie */
+	writel(RPM_FW_MAGIC_NUM, RPM_SIGNAL_COOKIE);
+
+	/* Wait for RPM start indication, up to 100ms. */
+	stopwatch_init_usecs_expire(&sw, 100000);
+	while (!(readl(RPM_INT) & ready_mask))
+		if (stopwatch_expired(&sw))
+			die("RPM Initialization failed\n");
+
+	/* Acknowledge RPM initialization */
+	writel(ready_mask, RPM_INT_ACK);
+}
 #endif  /* !__PRE_RAM__ */

src/soc/qualcomm/ipq806x/include/soc/iomap.h

@@ -81,6 +81,13 @@
 #define DGT_CLEAR            DGT_REG(0x000C)
 #define DGT_CLK_CTL          DGT_REG(0x0010)
 
+/* RPM interface constants */
+#define RPM_INT           ((void *)0x63020)
+#define RPM_INT_ACK       ((void *)0x63060)
+#define RPM_SIGNAL_COOKIE ((void *)0x47C20)
+#define RPM_SIGNAL_ENTRY  ((void *)0x47C24)
+#define RPM_FW_MAGIC_NUM 0x4D505242
+
 #define TLMM_BASE_ADDR      ((char *)0x00800000)
 #define GPIO_CONFIG_ADDR(x) (TLMM_BASE_ADDR + 0x1000 + (x)*0x10)
 #define GPIO_IN_OUT_ADDR(x) (GPIO_CONFIG_ADDR(x) + 4)
@@ -114,4 +121,5 @@
 #define GSBI_QUP5_BASE		0x1A280000
 #define GSBI_QUP6_BASE		0x16580000
 #define GSBI_QUP7_BASE		0x16680000
+
 #endif // __SOC_QUALCOMM_IPQ806X_IOMAP_H_

src/soc/qualcomm/ipq806x/include/soc/soc_services.h

@@ -30,6 +30,10 @@ int initialize_dram(void);
 /* Loads and runs TZBSP, switches into user mode. */
 void start_tzbsp(void);
 
+/* A helper function needed to start TZBSP properly. */
 int tz_init_wrapper(int, int, void *);
 
+/* Load RPM code into memory and trigger its execution. */
+void start_rpm(void);
+
 #endif