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>

6 files changed, 544 insertions, 0 deletions

diff --git a/arch/blackfin/oprofile/Kconfig b/arch/blackfin/oprofile/Kconfig
new file mode 100644
index 0000000..0a2fd99
--- /dev/null
+++ b/arch/blackfin/oprofile/Kconfig
@@ -0,0 +1,29 @@
+menu "Profiling support"
+depends on EXPERIMENTAL
+
+config PROFILING
+	bool "Profiling support (EXPERIMENTAL)"
+	help
+	  Say Y here to enable the extended profiling support mechanisms used
+	  by profilers such as OProfile.
+
+config OPROFILE
+	tristate "OProfile system profiling (EXPERIMENTAL)"
+	depends on PROFILING
+	help
+	  OProfile is a profiling system capable of profiling the
+	  whole system, include the kernel, kernel modules, libraries,
+	  and applications.
+
+	  If unsure, say N.
+
+config HARDWARE_PM
+	tristate "Hardware Performance Monitor Profiling"
+	depends on PROFILING
+	help
+	  take use of hardware performance monitor to profiling the kernel
+	  and application.
+
+	  If unsure, say N.
+
+endmenu
diff --git a/arch/blackfin/oprofile/Makefile b/arch/blackfin/oprofile/Makefile
new file mode 100644
index 0000000..634e300
--- /dev/null
+++ b/arch/blackfin/oprofile/Makefile
@@ -0,0 +1,14 @@
+#
+# arch/blackfin/oprofile/Makefile
+#
+
+obj-$(CONFIG_OPROFILE) += oprofile.o
+
+DRIVER_OBJS := $(addprefix ../../../drivers/oprofile/, \
+		oprof.o cpu_buffer.o buffer_sync.o \
+		event_buffer.o oprofile_files.o \
+		oprofilefs.o oprofile_stats.o \
+		timer_int.o )
+
+oprofile-y := $(DRIVER_OBJS) common.o
+oprofile-$(CONFIG_HARDWARE_PM) += op_model_bf533.o
diff --git a/arch/blackfin/oprofile/common.c b/arch/blackfin/oprofile/common.c
new file mode 100644
index 0000000..009a170
--- /dev/null
+++ b/arch/blackfin/oprofile/common.c
@@ -0,0 +1,168 @@
+/*
+ * File:         arch/blackfin/oprofile/common.c
+ * Based on:     arch/alpha/oprofile/common.c
+ * Author:       Anton Blanchard <anton@au.ibm.com>
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ *               Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
+ *               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/oprofile.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/blackfin.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include "op_blackfin.h"
+
+#define BFIN_533_ID  0xE5040003
+#define BFIN_537_ID  0xE5040002
+
+static int pfmon_enabled;
+static struct mutex pfmon_lock;
+
+struct op_bfin533_model *model;
+
+struct op_counter_config ctr[OP_MAX_COUNTER];
+
+static int op_bfin_setup(void)
+{
+	int ret;
+
+	/* Pre-compute the values to stuff in the hardware registers.  */
+	spin_lock(&oprofilefs_lock);
+	ret = model->reg_setup(ctr);
+	spin_unlock(&oprofilefs_lock);
+
+	return ret;
+}
+
+static void op_bfin_shutdown(void)
+{
+#if 0
+	/* what is the difference between shutdown and stop? */
+#endif
+}
+
+static int op_bfin_start(void)
+{
+	int ret = -EBUSY;
+
+	printk(KERN_INFO "KSDBG:in %s\n", __FUNCTION__);
+	mutex_lock(&pfmon_lock);
+	if (!pfmon_enabled) {
+		ret = model->start(ctr);
+		pfmon_enabled = !ret;
+	}
+	mutex_unlock(&pfmon_lock);
+
+	return ret;
+}
+
+static void op_bfin_stop(void)
+{
+	mutex_lock(&pfmon_lock);
+	if (pfmon_enabled) {
+		model->stop();
+		pfmon_enabled = 0;
+	}
+	mutex_unlock(&pfmon_lock);
+}
+
+static int op_bfin_create_files(struct super_block *sb, struct dentry *root)
+{
+	int i;
+
+	for (i = 0; i < model->num_counters; ++i) {
+		struct dentry *dir;
+		char buf[3];
+		printk(KERN_INFO "Oprofile: creating files... \n");
+
+		snprintf(buf, sizeof buf, "%d", i);
+		dir = oprofilefs_mkdir(sb, root, buf);
+
+		oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
+		oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
+		oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
+		/*
+		 * We dont support per counter user/kernel selection, but
+		 * we leave the entries because userspace expects them
+		 */
+		oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
+		oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
+		oprofilefs_create_ulong(sb, dir, "unit_mask",
+					&ctr[i].unit_mask);
+	}
+
+	return 0;
+}
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+#ifdef CONFIG_HARDWARE_PM
+	unsigned int dspid;
+
+	mutex_init(&pfmon_lock);
+
+	dspid = bfin_read_DSPID();
+
+	printk(KERN_INFO "Oprofile got the cpu id is 0x%x. \n", dspid);
+
+	switch (dspid) {
+	case BFIN_533_ID:
+		model = &op_model_bfin533;
+		model->num_counters = 2;
+		break;
+	case BFIN_537_ID:
+		model = &op_model_bfin533;
+		model->num_counters = 2;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	ops->cpu_type = model->name;
+	ops->create_files = op_bfin_create_files;
+	ops->setup = op_bfin_setup;
+	ops->shutdown = op_bfin_shutdown;
+	ops->start = op_bfin_start;
+	ops->stop = op_bfin_stop;
+
+	printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
+	       ops->cpu_type);
+
+	return 0;
+#else
+	return -1;
+#endif
+}
+
+void oprofile_arch_exit(void)
+{
+}
diff --git a/arch/blackfin/oprofile/op_blackfin.h b/arch/blackfin/oprofile/op_blackfin.h
new file mode 100644
index 0000000..f88f446
--- /dev/null
+++ b/arch/blackfin/oprofile/op_blackfin.h
@@ -0,0 +1,98 @@
+/*
+ * File:         arch/blackfin/oprofile/op_blackfin.h
+ * Based on:
+ * Author:       Anton Blanchard <anton@au.ibm.com>
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ *               Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
+ *               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
+ */
+
+#ifndef OP_BLACKFIN_H
+#define OP_BLACKFIN_H 1
+
+#define OP_MAX_COUNTER 2
+
+#include <asm/blackfin.h>
+
+/* Per-counter configuration as set via oprofilefs.  */
+struct op_counter_config {
+	unsigned long valid;
+	unsigned long enabled;
+	unsigned long event;
+	unsigned long count;
+	unsigned long kernel;
+	unsigned long user;
+	unsigned long unit_mask;
+};
+
+/* System-wide configuration as set via oprofilefs.  */
+struct op_system_config {
+	unsigned long enable_kernel;
+	unsigned long enable_user;
+};
+
+/* Per-arch configuration */
+struct op_bfin533_model {
+	int (*reg_setup) (struct op_counter_config *);
+	int (*start) (struct op_counter_config *);
+	void (*stop) (void);
+	int num_counters;
+	char *name;
+};
+
+extern struct op_bfin533_model op_model_bfin533;
+
+static inline unsigned int ctr_read(void)
+{
+	unsigned int tmp;
+
+	tmp = bfin_read_PFCTL();
+	__builtin_bfin_csync();
+
+	return tmp;
+}
+
+static inline void ctr_write(unsigned int val)
+{
+	bfin_write_PFCTL(val);
+	__builtin_bfin_csync();
+}
+
+static inline void count_read(unsigned int *count)
+{
+	count[0] = bfin_read_PFCNTR0();
+	count[1] = bfin_read_PFCNTR1();
+	__builtin_bfin_csync();
+}
+
+static inline void count_write(unsigned int *count)
+{
+	bfin_write_PFCNTR0(count[0]);
+	bfin_write_PFCNTR1(count[1]);
+	__builtin_bfin_csync();
+}
+
+extern int pm_overflow_handler(int irq, struct pt_regs *regs);
+
+#endif
diff --git a/arch/blackfin/oprofile/op_model_bf533.c b/arch/blackfin/oprofile/op_model_bf533.c
new file mode 100644
index 0000000..b7a20a0
--- /dev/null
+++ b/arch/blackfin/oprofile/op_model_bf533.c
@@ -0,0 +1,161 @@
+/*
+ * File:         arch/blackfin/oprofile/op_model_bf533.c
+ * Based on:
+ * Author:       Anton Blanchard <anton@au.ibm.com>
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ *               Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
+ *               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/oprofile.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/blackfin.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include "op_blackfin.h"
+
+#define PM_ENABLE 0x01;
+#define PM_CTL1_ENABLE  0x18
+#define PM_CTL0_ENABLE  0xC000
+#define COUNT_EDGE_ONLY 0x3000000
+
+static int oprofile_running;
+
+static unsigned curr_pfctl, curr_count[2];
+
+static int bfin533_reg_setup(struct op_counter_config *ctr)
+{
+	unsigned int pfctl = ctr_read();
+	unsigned int count[2];
+
+	/* set Blackfin perf monitor regs with ctr */
+	if (ctr[0].enabled) {
+		pfctl |= (PM_CTL0_ENABLE | ((char)ctr[0].event << 5));
+		count[0] = 0xFFFFFFFF - ctr[0].count;
+		curr_count[0] = count[0];
+	}
+	if (ctr[1].enabled) {
+		pfctl |= (PM_CTL1_ENABLE | ((char)ctr[1].event << 16));
+		count[1] = 0xFFFFFFFF - ctr[1].count;
+		curr_count[1] = count[1];
+	}
+
+	pr_debug("ctr[0].enabled=%d,ctr[1].enabled=%d,ctr[0].event<<5=0x%x,ctr[1].event<<16=0x%x\n", ctr[0].enabled, ctr[1].enabled, ctr[0].event << 5, ctr[1].event << 16);
+	pfctl |= COUNT_EDGE_ONLY;
+	curr_pfctl = pfctl;
+
+	pr_debug("write 0x%x to pfctl\n", pfctl);
+	ctr_write(pfctl);
+	count_write(count);
+
+	return 0;
+}
+
+static int bfin533_start(struct op_counter_config *ctr)
+{
+	unsigned int pfctl = ctr_read();
+
+	pfctl |= PM_ENABLE;
+	curr_pfctl = pfctl;
+
+	ctr_write(pfctl);
+
+	oprofile_running = 1;
+	pr_debug("start oprofile counter \n");
+
+	return 0;
+}
+
+static void bfin533_stop(void)
+{
+	int pfctl;
+
+	pfctl = ctr_read();
+	pfctl &= ~PM_ENABLE;
+	/* freeze counters */
+	ctr_write(pfctl);
+
+	oprofile_running = 0;
+	pr_debug("stop oprofile counter \n");
+}
+
+static int get_kernel(void)
+{
+	int ipend, is_kernel;
+
+	ipend = bfin_read_IPEND();
+
+	/* test bit 15 */
+	is_kernel = ((ipend & 0x8000) != 0);
+
+	return is_kernel;
+}
+
+int pm_overflow_handler(int irq, struct pt_regs *regs)
+{
+	int is_kernel;
+	int i, cpu;
+	unsigned int pc, pfctl;
+	unsigned int count[2];
+
+	pr_debug("get interrupt in %s\n", __FUNCTION__);
+	if (oprofile_running == 0) {
+		pr_debug("error: entering interrupt when oprofile is stopped.\n\r");
+		return -1;
+	}
+
+	is_kernel = get_kernel();
+	cpu = smp_processor_id();
+	pc = regs->pc;
+	pfctl = ctr_read();
+
+	/* read the two event counter regs */
+	count_read(count);
+
+	/* if the counter overflows, add sample to oprofile buffer */
+	for (i = 0; i < 2; ++i) {
+		if (oprofile_running) {
+			oprofile_add_sample(regs, i);
+		}
+	}
+
+	/* reset the perfmon counter */
+	ctr_write(curr_pfctl);
+	count_write(curr_count);
+	return 0;
+}
+
+struct op_bfin533_model op_model_bfin533 = {
+	.reg_setup = bfin533_reg_setup,
+	.start = bfin533_start,
+	.stop = bfin533_stop,
+	.num_counters = 2,
+	.name = "blackfin/bf533"
+};
diff --git a/arch/blackfin/oprofile/timer_int.c b/arch/blackfin/oprofile/timer_int.c
new file mode 100644
index 0000000..8fba16c
--- /dev/null
+++ b/arch/blackfin/oprofile/timer_int.c
@@ -0,0 +1,74 @@
+/*
+ * File:         arch/blackfin/oprofile/timer_int.c
+ * Based on:
+ * Author:       Michael Kang
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ *               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/init.h>
+#include <linux/smp.h>
+#include <linux/irq.h>
+#include <linux/oprofile.h>
+
+#include <asm/ptrace.h>
+
+static void enable_sys_timer0()
+{
+}
+static void disable_sys_timer0()
+{
+}
+
+static irqreturn_t sys_timer0_int_handler(int irq, void *dev_id,
+					  struct pt_regs *regs)
+{
+	oprofile_add_sample(regs, 0);
+	return IRQ_HANDLED;
+}
+
+static int sys_timer0_start(void)
+{
+	enable_sys_timer0();
+	return request_irq(IVG11, sys_timer0_int_handler, 0, "sys_timer0", NULL);
+}
+
+static void sys_timer0_stop(void)
+{
+	disable_sys_timer();
+}
+
+int __init sys_timer0_init(struct oprofile_operations *ops)
+{
+	extern int nmi_active;
+
+	if (nmi_active <= 0)
+		return -ENODEV;
+
+	ops->start = timer_start;
+	ops->stop = timer_stop;
+	ops->cpu_type = "timer";
+	printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
+	return 0;
+}