New patch to review for coreboot: ead2b9c t132: kick off core complex after loading MTS microcode

[Marc Jones]

Marc Jones ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8581

-gerrit

commit ead2b9c4e2acda9fa801283e2108ead61ea9d1f2
Author: Aaron Durbin 
Date:   Tue Jul 1 13:51:21 2014 -0500

t132: kick off core complex after loading MTS microcode

Once the MTS microcode is loaded the core complex can be
    directed to decode the MTS and start running. The cores,
    however, won't start executing until instructed to do so.

BUG=chrome-os-partner:29222
    BRANCH=None
    TEST=Built, booted, ran. Noted it took about 920ms for the
         core complex to decode and handshake back.

Original-Change-Id: I0a9ed53e596eb65801461b2769d133710a92a48a
    Original-Signed-off-by: Aaron Durbin 
    Original-Reviewed-on: https://chromium-review.googlesource.com/206075
    Original-Reviewed-by: Furquan Shaikh 
    Original-Reviewed-by: Tom Warren 
    (cherry picked from commit 6edb6e21a69d84ba5b23137e9e390954159e7887)
    Signed-off-by: Marc Jones

Change-Id: I179e561bb3a34b206620eecde6781a1c05a3744e
---
 src/soc/nvidia/tegra132/ccplex.c | 48 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/src/soc/nvidia/tegra132/ccplex.c b/src/soc/nvidia/tegra132/ccplex.c
index b569bd2..b774630 100644
--- a/src/soc/nvidia/tegra132/ccplex.c
+++ b/src/soc/nvidia/tegra132/ccplex.c
@@ -21,12 +21,58 @@
 #include <console/console.h>
 #include <arch/io.h>
 #include <cbfs.h>
+#include <timer.h>
 #include <soc/addressmap.h>
+#include "clk_rst.h"
 #include "ccplex.h"
 #include "mc.h"
+#include "pmc.h"

+#define CLK_RST_REGS (void *)(uintptr_t)(TEGRA_CLK_RST_BASE)
+#define PMC_REGS (void *)(uintptr_t)(TEGRA_PMC_BASE)
 #define MTS_FILE_NAME "mts"

+static int ccplex_start(void)
+{
+	struct mono_time t1, t2;
+	const long timeout_us = 1500000;
+	long wait_time;
+	const uint32_t handshake_mask = 1;
+	const uint32_t cxreset1_mask = 1 << 21;
+	uint32_t reg;
+	struct tegra_pmc_regs * const pmc = PMC_REGS;
+	struct clk_rst_ctlr * const clk_rst = CLK_RST_REGS;
+
+	/* Set the handshake bit to be knocked down. */
+	write32(handshake_mask, &pmc->scratch118);
+
+	/* Assert nCXRSET[1] */
+	reg = read32(&clk_rst->rst_cpu_cmplx_set);
+	reg |= cxreset1_mask;
+	write32(reg, &clk_rst->rst_cpu_cmplx_set);
+
+	timer_monotonic_get(&t1);
+	while (1) {
+		reg = read32(&pmc->scratch118);
+		timer_monotonic_get(&t2);
+
+		wait_time = mono_time_diff_microseconds(&t1, &t2);
+
+		/* Wait for the bit to be knocked down. */
+		if ((reg & handshake_mask) != handshake_mask)
+			break;
+
+		if (wait_time >= timeout_us) {
+			printk(BIOS_DEBUG, "MTS handshake timeout.\n");
+			return -1;
+		}
+	}
+
+	printk(BIOS_DEBUG, "MTS handshake took %ld us.\n", wait_time);
+
+	return 0;
+}
+
 int ccplex_load_mts(void)
 {
    struct cbfs_file file;
@@ -57,5 +103,5 @@ int ccplex_load_mts(void)

printk(BIOS_DEBUG, "MTS: %zu bytes loaded @ %p\n", nread, mts);

-	return 0;
+	return ccplex_start();
 }