blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 181 insertions, 0 deletions

diff --git a/arch/blackfin/mach-common/pm.c b/arch/blackfin/mach-common/pm.c
new file mode 100644
index 000000000000..deb27272c658
--- /dev/null
+++ b/arch/blackfin/mach-common/pm.c
@@ -0,0 +1,181 @@
+/*
+ * File:         arch/blackfin/mach-common/pm.c
+ * Based on:     arm/mach-omap/pm.c
+ * Author:       Cliff Brake <cbrake@accelent.com> Copyright (c) 2001
+ *
+ * Created:      2001
+ * Description:  Power management for the bfin
+ *
+ * Modified:     Nicolas Pitre - PXA250 support
+ *                Copyright (c) 2002 Monta Vista Software, Inc.
+ *               David Singleton - OMAP1510
+ *                Copyright (c) 2002 Monta Vista Software, Inc.
+ *               Dirk Behme <dirk.behme@de.bosch.com> - OMAP1510/1610
+ *                Copyright 2004
+ *               Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/pm.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+
+#include <asm/io.h>
+#include <asm/dpmc.h>
+#include <asm/irq.h>
+
+
+#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_H
+#define WAKEUP_TYPE     PM_WAKE_HIGH
+#endif
+
+#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_L
+#define WAKEUP_TYPE     PM_WAKE_LOW
+#endif
+
+#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_F
+#define WAKEUP_TYPE     PM_WAKE_FALLING
+#endif
+
+#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_R
+#define WAKEUP_TYPE     PM_WAKE_RISING
+#endif
+
+#ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_B
+#define WAKEUP_TYPE     PM_WAKE_BOTH_EDGES
+#endif
+
+void bfin_pm_suspend_standby_enter(void)
+{
+#ifdef CONFIG_PM_WAKEUP_BY_GPIO
+        gpio_pm_wakeup_request(CONFIG_PM_WAKEUP_GPIO_NUMBER, WAKEUP_TYPE);
+#endif
+
+#if defined(CONFIG_PM_WAKEUP_BY_GPIO) || defined(CONFIG_PM_WAKEUP_GPIO_API)
+        {
+                u32 flags;
+
+                local_irq_save(flags);
+
+                sleep_deeper(gpio_pm_setup()); /*Goto Sleep*/
+
+                gpio_pm_restore();
+
+                bfin_write_SIC_IWR(IWR_ENABLE_ALL);
+
+                local_irq_restore(flags);
+        }
+#endif
+
+#if defined(CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR)
+        sleep_deeper(CONFIG_PM_WAKEUP_SIC_IWR);
+        bfin_write_SIC_IWR(IWR_ENABLE_ALL);
+#endif                          /* CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR */
+}
+
+
+/*
+ *      bfin_pm_prepare - Do preliminary suspend work.
+ *      @state:         suspend state we're entering.
+ *
+ */
+static int bfin_pm_prepare(suspend_state_t state)
+{
+        int error = 0;
+
+        switch (state) {
+        case PM_SUSPEND_STANDBY:
+                break;
+        case PM_SUSPEND_MEM:
+                return -ENOTSUPP;
+
+        case PM_SUSPEND_DISK:
+                return -ENOTSUPP;
+
+        default:
+                return -EINVAL;
+        }
+
+        return error;
+}
+
+/*
+ *      bfin_pm_enter - Actually enter a sleep state.
+ *      @state:         State we're entering.
+ *
+ */
+static int bfin_pm_enter(suspend_state_t state)
+{
+        switch (state) {
+        case PM_SUSPEND_STANDBY:
+                bfin_pm_suspend_standby_enter();
+                break;
+        case PM_SUSPEND_MEM:
+                return -ENOTSUPP;
+
+        case PM_SUSPEND_DISK:
+                return -ENOTSUPP;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+/*
+ *      bfin_pm_finish - Finish up suspend sequence.
+ *      @state:         State we're coming out of.
+ *
+ *      This is called after we wake back up (or if entering the sleep state
+ *      failed).
+ */
+static int bfin_pm_finish(suspend_state_t state)
+{
+        switch (state) {
+        case PM_SUSPEND_STANDBY:
+                break;
+
+        case PM_SUSPEND_MEM:
+                return -ENOTSUPP;
+
+        case PM_SUSPEND_DISK:
+                return -ENOTSUPP;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+struct pm_ops bfin_pm_ops = {
+        .pm_disk_mode = PM_DISK_PLATFORM,
+        .prepare = bfin_pm_prepare,
+        .enter = bfin_pm_enter,
+        .finish = bfin_pm_finish,
+};
+
+static int __init bfin_pm_init(void)
+{
+        pm_set_ops(&bfin_pm_ops);
+        return 0;
+}
+
+__initcall(bfin_pm_init);