[PATCH v2 2/2] OMAP3: beagle xm: enable upto 800MHz OPP

[Nishanth Menon <nm@ti.com>]

OMP3630 silicon can enable higher frequencies only depending on the board
characteristics meeting the recommended standards, and has to be selectively
toggled.

Beagle XM uses 3730 variant and the board design allows enabling 800MHz and
1GHz OPPs. However, We need Smart reflex class 1.5 and ABB to enable 1GHz
safely.  For the moment, we tweak the default table to allow for 800Mhz OPP
usage.

Reported-by: Koen Kooi <koen@beagleboard.org>
Tested-by: Koen Kooi <koen@beagleboard.org>

Signed-off-by: Nishanth Menon <nm@ti.com>
---
v2: fixed issue when !mh || !dh, updated commit message to point on rationale
    for board specific tweaking
v1: http://marc.info/?t=129426060900008&r=1&w=2
 arch/arm/mach-omap2/board-omap3beagle.c |   50 +++++++++++++++++++++++++++++++
 1 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 6c12760..7dc0397 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -23,6 +23,7 @@
 #include <linux/gpio.h>
 #include <linux/input.h>
 #include <linux/gpio_keys.h>
+#include <linux/opp.h>
 
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
@@ -44,10 +45,12 @@
 #include <plat/gpmc.h>
 #include <plat/nand.h>
 #include <plat/usb.h>
+#include <plat/omap_device.h>
 
 #include "mux.h"
 #include "hsmmc.h"
 #include "timer-gp.h"
+#include "pm.h"
 
 #define NAND_BLOCK_SIZE		SZ_128K
 
@@ -556,6 +559,52 @@ static struct omap_musb_board_data musb_board_data = {
 	.power			= 100,
 };
 
+static void __init beagle_opp_init(void)
+{
+	int r = 0;
+
+	/* Initialize the omap3 opp table */
+	if (omap3_opp_init()) {
+		pr_err("%s: opp default init failed\n", __func__);
+		return;
+	}
+
+	/* Custom OPP enabled for XM */
+	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
+		struct omap_hwmod *mh = omap_hwmod_lookup("mpu");
+		struct omap_hwmod *dh = omap_hwmod_lookup("iva");
+		struct device *dev;
+
+		if (!mh || !dh) {
+			pr_err("%s: Aiee.. no mpu/dsp devices? %p %p\n",
+				__func__, mh, dh);
+			return;
+		}
+		/* Enable MPU 1GHz and lower opps */
+		dev = &mh->od->pdev.dev;
+		r = opp_enable(dev, 800000000);
+		/* TODO: MPU 1GHz needs SR and ABB */
+
+		/* Enable IVA 800MHz and lower opps */
+		dev = &dh->od->pdev.dev;
+		r |= opp_enable(dev, 660000000);
+		/* TODO: DSP 800MHz needs SR and ABB */
+		if (r) {
+			pr_err("%s: failed to enable higher opp %d\n",
+				__func__, r);
+			/*
+			 * Cleanup - disable the higher freqs - we dont care
+			 * about the results
+			 */
+			dev = &mh->od->pdev.dev;
+			opp_disable(dev, 800000000);
+			dev = &dh->od->pdev.dev;
+			opp_disable(dev, 660000000);
+		}
+	}
+	return;
+}
+
 static void __init omap3_beagle_init(void)
 {
 	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
@@ -579,6 +628,7 @@ static void __init omap3_beagle_init(void)
 	omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);
 
 	beagle_display_init();
+	beagle_opp_init();
 }
 
 MACHINE_START(OMAP3_BEAGLE, "OMAP3 Beagle Board")
-- 
1.6.3.3