[PATCH v2 5/5] tegra: add power management controller driver

[Lucas Stach]

Currently only implements system wide reset functionality.

Signed-off-by: Lucas Stach <dev at lynxeye.de>
---
 arch/arm/mach-tegra/Makefile      |  2 +-
 arch/arm/mach-tegra/reset.c       | 39 -----------------
 arch/arm/mach-tegra/tegra20-pmc.c | 89 +++++++++++++++++++++++++++++++++++++++
 arch/arm/mach-tegra/tegra20.c     |  4 ++
 4 files changed, 94 insertions(+), 40 deletions(-)
 delete mode 100644 arch/arm/mach-tegra/reset.c
 create mode 100644 arch/arm/mach-tegra/tegra20-pmc.c

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 6aa219c..bcc0cd4 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -1,4 +1,4 @@
-obj-y += reset.o
 obj-y += tegra20.o
 obj-y += tegra20-car.o
+obj-y += tegra20-pmc.o
 obj-y += tegra20-timer.o
diff --git a/arch/arm/mach-tegra/reset.c b/arch/arm/mach-tegra/reset.c
deleted file mode 100644
index 91f9b3b..0000000
--- a/arch/arm/mach-tegra/reset.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright (C) 2011 Antony Pavlov <antonynpavlov at gmail.com>
- *
- * This file is part of barebox.
- * See file CREDITS for list of people who contributed to this project.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- */
-
-/**
- * @file
- * @brief Resetting an malta board
- */
-
-#include <common.h>
-#include <asm/io.h>
-#include <mach/iomap.h>
-
-#define PRM_RSTCTRL		TEGRA_PMC_BASE
-
-void __noreturn reset_cpu(ulong addr)
-{
-	int rstctrl;
-
-	rstctrl = __raw_readl((char *)PRM_RSTCTRL);
-	rstctrl |= 0x10;
-	__raw_writel(rstctrl, (char *)PRM_RSTCTRL);
-
-	unreachable();
-}
-EXPORT_SYMBOL(reset_cpu);
diff --git a/arch/arm/mach-tegra/tegra20-pmc.c b/arch/arm/mach-tegra/tegra20-pmc.c
new file mode 100644
index 0000000..ed765f5
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra20-pmc.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2013 Lucas Stach <l.stach at pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file
+ * @brief Device driver for the Tegra 20 power management controller.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+
+/* register definitions */
+#define PMC_CNTRL			0x00
+#define PMC_CNTRL_FUSE_OVERRIDE		(1 << 18)
+#define PMC_CNTRL_INTR_POLARITY		(1 << 17)
+#define PMC_CNTRL_CPUPWRREQ_OE		(1 << 16)
+#define PMC_CNTRL_CPUPWRREQ_POLARITY	(1 << 15)
+#define PMC_CNTRL_SIDE_EFFECT_LP0	(1 << 14)
+#define PMC_CNTRL_AOINIT		(1 << 13)
+#define PMC_CNTRL_PWRGATE_DIS		(1 << 12)
+#define PMC_CNTRL_SYSCLK_OE		(1 << 11)
+#define PMC_CNTRL_SYSCLK_POLARITY	(1 << 10)
+#define PMC_CNTRL_PWRREQ_OE		(1 << 9)
+#define PMC_CNTRL_PWRREQ_POLARITY	(1 << 8)
+#define PMC_CNTRL_BLINK_EN		(1 << 7)
+#define PMC_CNTRL_GLITCHDET_DIS		(1 << 6)
+#define PMC_CNTRL_LATCHWAKE_EN		(1 << 5)
+#define PMC_CNTRL_MAIN_RST		(1 << 4)
+#define PMC_CNTRL_KBC_RST		(1 << 3)
+#define PMC_CNTRL_RTC_RST		(1 << 2)
+#define PMC_CNTRL_RTC_CLK_DIS		(1 << 1)
+#define PMC_CNTRL_KBC_CLK_DIS		(1 << 0)
+
+static void __iomem *pmc_base;
+
+/* main SoC reset trigger */
+void __noreturn reset_cpu(ulong addr)
+{
+	writel(PMC_CNTRL_MAIN_RST, pmc_base + PMC_CNTRL);
+
+	unreachable();
+}
+EXPORT_SYMBOL(reset_cpu);
+
+static int tegra20_pmc_probe(struct device_d *dev)
+{
+	pmc_base = dev_request_mem_region(dev, 0);
+	if (!pmc_base) {
+		dev_err(dev, "could not get memory region\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static __maybe_unused struct of_device_id tegra20_pmc_dt_ids[] = {
+	{
+		.compatible = "nvidia,tegra20-pmc",
+	}, {
+		/* sentinel */
+	}
+};
+
+static struct driver_d tegra20_pmc_driver = {
+	.probe	= tegra20_pmc_probe,
+	.name	= "tegra20-pmc",
+	.of_compatible = DRV_OF_COMPAT(tegra20_pmc_dt_ids),
+};
+
+static int tegra20_pmc_init(void)
+{
+	return platform_driver_register(&tegra20_pmc_driver);
+}
+
+coredevice_initcall(tegra20_pmc_init);
diff --git a/arch/arm/mach-tegra/tegra20.c b/arch/arm/mach-tegra/tegra20.c
index c1b3f78..884671a 100644
--- a/arch/arm/mach-tegra/tegra20.c
+++ b/arch/arm/mach-tegra/tegra20.c
@@ -28,6 +28,10 @@ static int tegra20_init(void)
 			   TEGRA_TMR1_BASE, TEGRA_TMR1_SIZE,
 			   IORESOURCE_MEM, NULL);
 
+	add_generic_device("tegra20-pmc", DEVICE_ID_SINGLE, NULL,
+			   TEGRA_PMC_BASE, TEGRA_PMC_SIZE,
+			   IORESOURCE_MEM, NULL);
+
 	return 0;
 }
 
-- 
1.8.1.2