[RFC/PATCH 1/7] arm: omap: hwmod: add debugfs interface

[Felipe Balbi <balbi@ti.com>]

By exposing the details of hwmod structures
to debugfs we can much more easily verify
that changes to hwmod data is correct and won't
cause regressions.

The idea is that this can be used to check the
state of one hwmod, verify hwmod sysc fields, etc.

For example, this will be used to move some of
the sysc fields to DT and later verify that they
are correct pre- and post-patch.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 arch/arm/mach-omap2/Makefile             |   2 +-
 arch/arm/mach-omap2/omap_device.c        |   2 +
 arch/arm/mach-omap2/omap_hwmod.h         |   9 ++
 arch/arm/mach-omap2/omap_hwmod_debugfs.c | 269 +++++++++++++++++++++++++++++++
 4 files changed, 281 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/mach-omap2/omap_hwmod_debugfs.c

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 5d27dfd..68c9ae5 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -11,7 +11,7 @@ obj-y := id.o io.o control.o mux.o devices.o fb.o serial.o timer.o pm.o \
 	 omap_device.o sram.o drm.o
 
 hwmod-common				= omap_hwmod.o omap_hwmod_reset.o \
-					  omap_hwmod_common_data.o
+					  omap_hwmod_common_data.o omap_hwmod_debugfs.o
 clock-common				= clock.o clock_common_data.o \
 					  clkt_dpll.o clkt_clksel.o
 secure-common				= omap-smc.o omap-secure.o
diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 8c58b71..abd622b 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -156,6 +156,8 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
 		hwmods[i] = oh;
 		if (oh->flags & HWMOD_INIT_NO_IDLE)
 			device_active = true;
+
+		omap_hwmod_register_debugfs(oh);
 	}
 
 	od = omap_device_alloc(pdev, hwmods, oh_cnt);
diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h
index 35ca6ef..fcf55f5 100644
--- a/arch/arm/mach-omap2/omap_hwmod.h
+++ b/arch/arm/mach-omap2/omap_hwmod.h
@@ -768,4 +768,13 @@ int am43xx_hwmod_init(void);
 
 extern int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois);
 
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+extern int omap_hwmod_register_debugfs(struct omap_hwmod *oh);
+#else
+static inline int omap_hwmod_register_debugfs(struct omap_hwmod *oh)
+{
+	return 0;
+}
+#endif
+
 #endif
diff --git a/arch/arm/mach-omap2/omap_hwmod_debugfs.c b/arch/arm/mach-omap2/omap_hwmod_debugfs.c
new file mode 100644
index 0000000..cc9533b
--- /dev/null
+++ b/arch/arm/mach-omap2/omap_hwmod_debugfs.c
@@ -0,0 +1,269 @@
+/*
+ * omap_hwmod debugfs view
+ *
+ * Copyright (C) 2014 Texas Instruments, Incorporated - http://www.ti.com
+ * Author: Felipe Balbi <balbi@ti.com>
+ *
+ * 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.
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "clock.h"
+#include "omap_hwmod.h"
+
+#include "soc.h"
+#include "common.h"
+#include "clockdomain.h"
+#include "powerdomain.h"
+#include "cm2xxx.h"
+#include "cm3xxx.h"
+#include "cm33xx.h"
+#include "prm.h"
+#include "prm3xxx.h"
+#include "prm44xx.h"
+#include "prm33xx.h"
+#include "prminst44xx.h"
+#include "mux.h"
+#include "pm.h"
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static struct dentry *omap_hwmod_debugfs_root;
+
+static int __init omap_hwmod_create_files(struct omap_hwmod *oh,
+		struct dentry *dir)
+{
+	struct dentry *file;
+
+	file = debugfs_create_u16("flags", S_IRUGO, dir, &oh->flags);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("mpu_rt_idx", S_IRUGO, dir, &oh->mpu_rt_idx);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("response_lat", S_IRUGO, dir,
+			&oh->response_lat);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("rst_lines_cnt", S_IRUGO, dir,
+			&oh->rst_lines_cnt);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("opt_clks_cnt", S_IRUGO, dir,
+			&oh->opt_clks_cnt);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("masters_cnt", S_IRUGO, dir, &oh->masters_cnt);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("slaves_cnt", S_IRUGO, dir, &oh->slaves_cnt);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("hwmods_cnt", S_IRUGO, dir, &oh->hwmods_cnt);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("_int_flags", S_IRUGO, dir, &oh->_int_flags);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("_state", S_IRUGO, dir, &oh->_state);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("_postsetup_state", S_IRUGO, dir,
+			&oh->_postsetup_state);
+	if (!file)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int __init
+omap_hwmod_create_sysc_files(struct omap_hwmod_class_sysconfig *sysc,
+		struct dentry *dir)
+{
+	struct dentry *subdir;
+	struct dentry *file;
+
+	if (!sysc)
+		return 0;
+
+	subdir = debugfs_create_dir("sysc", dir);
+	if (!subdir)
+		return -ENOMEM;
+
+	file = debugfs_create_x32("rev_offs", S_IRUGO, subdir,
+			&sysc->rev_offs);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_x32("sysc_offs", S_IRUGO, subdir,
+			&sysc->sysc_offs);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_x32("syss_offs", S_IRUGO, subdir,
+			&sysc->syss_offs);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_x16("sysc_flags", S_IRUGO, subdir,
+			&sysc->sysc_flags);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("srst_udelay", S_IRUGO, subdir,
+			&sysc->srst_udelay);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_x8("idlemodes", S_IRUGO, subdir,
+			&sysc->idlemodes);
+	if (!file)
+		return -ENOMEM;
+
+	file = debugfs_create_u8("clockact", S_IRUGO, subdir, &sysc->clockact);
+	if (!file)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int __init omap_hwmod_create_class_files(struct omap_hwmod_class *class,
+		struct dentry *dir)
+{
+	struct dentry *subdir;
+	struct dentry *file;
+	int ret;
+
+	if (!class)
+		return 0;
+
+	subdir = debugfs_create_dir("class", dir);
+	if (!subdir)
+		return -ENOMEM;
+
+	file = debugfs_create_u32("rev", S_IRUGO, subdir, &class->rev);
+	if (!file)
+		return -ENOMEM;
+
+	ret = omap_hwmod_create_sysc_files(class->sysc, subdir);
+	if (ret)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int __init omap_hwmod_create_irq_files(struct omap_hwmod_irq_info *irqs,
+		struct dentry *dir)
+{
+	struct dentry *subdir;
+	int i = 0;
+
+	if (!irqs)
+		return 0;
+
+	subdir = debugfs_create_dir("irqs", dir);
+	if (!subdir)
+		return -ENOMEM;
+
+	while (irqs[i].irq != -1) {
+		struct dentry *file;
+
+		file = debugfs_create_u16(irqs[i].name, S_IRUGO, subdir,
+				&irqs[i].irq);
+		if (!file)
+			return -ENOMEM;
+		i++;
+	}
+
+	return 0;
+}
+
+static int __init omap_hwmod_create_dma_files(struct omap_hwmod_dma_info *dmas,
+		struct dentry *dir)
+{
+	struct dentry *subdir;
+	int i = 0;
+
+	if (!dmas)
+		return 0;
+
+	subdir = debugfs_create_dir("dmas", dir);
+	if (!subdir)
+		return -ENOMEM;
+
+	while (dmas[i].dma_req != -1) {
+		struct dentry *file;
+
+		file = debugfs_create_u16(dmas[i].name, S_IRUGO, subdir,
+				&dmas[i].dma_req);
+		if (!file)
+			return -ENOMEM;
+		i++;
+	}
+
+	return 0;
+}
+
+int omap_hwmod_register_debugfs(struct omap_hwmod *oh)
+{
+	struct dentry *root;
+	struct dentry *dir;
+	int ret;
+
+	if (!omap_hwmod_debugfs_root) {
+		root = debugfs_create_dir("omap_hwmod", NULL);
+		if (!root ) {
+			pr_debug("omap_hwmod: unable to initialize debugfs\n");
+			return 0;
+		}
+
+		omap_hwmod_debugfs_root = root;
+	} else {
+		root = omap_hwmod_debugfs_root;
+	}
+
+	dir = debugfs_create_dir(oh->name, root);
+	if (!dir)
+		return -ENOMEM;
+
+	ret = omap_hwmod_create_files(oh, dir);
+	if (ret)
+		return ret;
+
+	ret = omap_hwmod_create_class_files(oh->class, dir);
+	if (ret)
+		return ret;
+
+	ret = omap_hwmod_create_irq_files(oh->mpu_irqs, dir);
+	if (ret)
+		return ret;
+
+	ret = omap_hwmod_create_dma_files(oh->sdma_reqs, dir);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+#endif
-- 
2.2.0