Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration

Pull mailbox updates from Jassi Brar:
 "OMAP:
   - Remove non-DT support from mailbox driver
   - Move PM from client calls to native driver suspend/resume
   - Trivial cleanups to make checkpatch happy

  STI:
   - Check return from devm_ioremap_resource as ERR_PTR, not NULL"

* 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Fix devm_ioremap_resource error detection code
  mailbox/omap: kill omap_mbox_{save/restore}_ctx() functions
  mailbox/omap: check for any unread messages during suspend
  mailbox/omap: add support for suspend/resume
  mailbox/omap: store mailbox interrupt type in omap_mbox_device
  mailbox/omap: add blank lines after declarations
  mailbox/omap: remove FSF mailing address paragraph
  mailbox/omap: use variable name for sizeof() operator
  mailbox/omap: drop legacy platform device support

drivers/mailbox/mailbox-sti.c

@@ -430,8 +430,8 @@ static int sti_mbox_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	mdev->base = devm_ioremap_resource(&pdev->dev, res);
-	if (!mdev->base)
-		return -ENOMEM;
+	if (IS_ERR(mdev->base))
+		return PTR_ERR(mdev->base);
 
 	ret = of_property_read_string(np, "mbox-name", &mdev->name);
 	if (ret)

drivers/mailbox/omap-mailbox.c

@@ -2,7 +2,7 @@
  * OMAP mailbox driver
  *
  * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
- * Copyright (C) 2013-2014 Texas Instruments Inc.
+ * Copyright (C) 2013-2016 Texas Instruments Incorporated - http://www.ti.com
  *
  * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
  *          Suman Anna <s-anna@ti.com>
@@ -15,12 +15,6 @@
  * 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, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
  */
 
 #include <linux/interrupt.h>
@@ -33,7 +27,6 @@
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-#include <linux/platform_data/mailbox-omap.h>
 #include <linux/omap-mailbox.h>
 #include <linux/mailbox_controller.h>
 #include <linux/mailbox_client.h>
@@ -62,12 +55,9 @@
 #define MAILBOX_IRQ_NEWMSG(m)		(1 << (2 * (m)))
 #define MAILBOX_IRQ_NOTFULL(m)		(1 << (2 * (m) + 1))
 
-#define MBOX_REG_SIZE			0x120
-
-#define OMAP4_MBOX_REG_SIZE		0x130
-
-#define MBOX_NR_REGS			(MBOX_REG_SIZE / sizeof(u32))
-#define OMAP4_MBOX_NR_REGS		(OMAP4_MBOX_REG_SIZE / sizeof(u32))
+/* Interrupt register configuration types */
+#define MBOX_INTR_CFG_TYPE1		0
+#define MBOX_INTR_CFG_TYPE2		1
 
 struct omap_mbox_fifo {
 	unsigned long msg;
@@ -91,8 +81,10 @@ struct omap_mbox_device {
 	struct device *dev;
 	struct mutex cfg_lock;
 	void __iomem *mbox_base;
+	u32 *irq_ctx;
 	u32 num_users;
 	u32 num_fifos;
+	u32 intr_type;
 	struct omap_mbox **mboxes;
 	struct mbox_controller controller;
 	struct list_head elem;
@@ -119,7 +111,6 @@ struct omap_mbox {
 	struct omap_mbox_device *parent;
 	struct omap_mbox_fifo	tx_fifo;
 	struct omap_mbox_fifo	rx_fifo;
-	u32			ctx[OMAP4_MBOX_NR_REGS];
 	u32			intr_type;
 	struct mbox_chan	*chan;
 	bool			send_no_irq;
@@ -157,24 +148,28 @@ void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
 static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
 {
 	struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
-	return (mbox_msg_t) mbox_read_reg(mbox->parent, fifo->msg);
+
+	return (mbox_msg_t)mbox_read_reg(mbox->parent, fifo->msg);
 }
 
 static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
 {
 	struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
+
 	mbox_write_reg(mbox->parent, msg, fifo->msg);
 }
 
 static int mbox_fifo_empty(struct omap_mbox *mbox)
 {
 	struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
+
 	return (mbox_read_reg(mbox->parent, fifo->msg_stat) == 0);
 }
 
 static int mbox_fifo_full(struct omap_mbox *mbox)
 {
 	struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
+
 	return mbox_read_reg(mbox->parent, fifo->fifo_stat);
 }
 
@@ -206,49 +201,6 @@ static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 	return (int)(enable & status & bit);
 }
 
-void omap_mbox_save_ctx(struct mbox_chan *chan)
-{
-	int i;
-	int nr_regs;
-	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
-
-	if (WARN_ON(!mbox))
-		return;
-
-	if (mbox->intr_type)
-		nr_regs = OMAP4_MBOX_NR_REGS;
-	else
-		nr_regs = MBOX_NR_REGS;
-	for (i = 0; i < nr_regs; i++) {
-		mbox->ctx[i] = mbox_read_reg(mbox->parent, i * sizeof(u32));
-
-		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
-			i, mbox->ctx[i]);
-	}
-}
-EXPORT_SYMBOL(omap_mbox_save_ctx);
-
-void omap_mbox_restore_ctx(struct mbox_chan *chan)
-{
-	int i;
-	int nr_regs;
-	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
-
-	if (WARN_ON(!mbox))
-		return;
-
-	if (mbox->intr_type)
-		nr_regs = OMAP4_MBOX_NR_REGS;
-	else
-		nr_regs = MBOX_NR_REGS;
-	for (i = 0; i < nr_regs; i++) {
-		mbox_write_reg(mbox->parent, mbox->ctx[i], i * sizeof(u32));
-		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
-			i, mbox->ctx[i]);
-	}
-}
-EXPORT_SYMBOL(omap_mbox_restore_ctx);
-
 static void _omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	u32 l;
@@ -381,7 +333,7 @@ static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
 	if (!work)
 		return NULL;
 
-	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
+	mq = kzalloc(sizeof(*mq), GFP_KERNEL);
 	if (!mq)
 		return NULL;
 
@@ -525,6 +477,7 @@ static int omap_mbox_register(struct omap_mbox_device *mdev)
 	mboxes = mdev->mboxes;
 	for (i = 0; mboxes[i]; i++) {
 		struct omap_mbox *mbox = mboxes[i];
+
 		mbox->dev = device_create(&omap_mbox_class, mdev->dev,
 					0, mbox, "%s", mbox->name);
 		if (IS_ERR(mbox->dev)) {
@@ -647,6 +600,52 @@ static const struct mbox_chan_ops omap_mbox_chan_ops = {
 	.shutdown       = omap_mbox_chan_shutdown,
 };
 
+#ifdef CONFIG_PM_SLEEP
+static int omap_mbox_suspend(struct device *dev)
+{
+	struct omap_mbox_device *mdev = dev_get_drvdata(dev);
+	u32 usr, fifo, reg;
+
+	if (pm_runtime_status_suspended(dev))
+		return 0;
+
+	for (fifo = 0; fifo < mdev->num_fifos; fifo++) {
+		if (mbox_read_reg(mdev, MAILBOX_MSGSTATUS(fifo))) {
+			dev_err(mdev->dev, "fifo %d has unexpected unread messages\n",
+				fifo);
+			return -EBUSY;
+		}
+	}
+
+	for (usr = 0; usr < mdev->num_users; usr++) {
+		reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);
+		mdev->irq_ctx[usr] = mbox_read_reg(mdev, reg);
+	}
+
+	return 0;
+}
+
+static int omap_mbox_resume(struct device *dev)
+{
+	struct omap_mbox_device *mdev = dev_get_drvdata(dev);
+	u32 usr, reg;
+
+	if (pm_runtime_status_suspended(dev))
+		return 0;
+
+	for (usr = 0; usr < mdev->num_users; usr++) {
+		reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);
+		mbox_write_reg(mdev, mdev->irq_ctx[usr], reg);
+	}
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops omap_mbox_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(omap_mbox_suspend, omap_mbox_resume)
+};
+
 static const struct of_device_id omap_mailbox_of_match[] = {
 	{
 		.compatible	= "ti,omap2-mailbox",
@@ -696,8 +695,6 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	int ret;
 	struct mbox_chan *chnls;
 	struct omap_mbox **list, *mbox, *mboxblk;
-	struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
-	struct omap_mbox_dev_info *info = NULL;
 	struct omap_mbox_fifo_info *finfo, *finfoblk;
 	struct omap_mbox_device *mdev;
 	struct omap_mbox_fifo *fifo;
@@ -710,36 +707,26 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	u32 l;
 	int i;
 
-	if (!node && (!pdata || !pdata->info_cnt || !pdata->info)) {
-		pr_err("%s: platform not supported\n", __func__);
+	if (!node) {
+		pr_err("%s: only DT-based devices are supported\n", __func__);
 		return -ENODEV;
 	}
 
-	if (node) {
-		match = of_match_device(omap_mailbox_of_match, &pdev->dev);
-		if (!match)
-			return -ENODEV;
-		intr_type = (u32)match->data;
+	match = of_match_device(omap_mailbox_of_match, &pdev->dev);
+	if (!match)
+		return -ENODEV;
+	intr_type = (u32)match->data;
 
-		if (of_property_read_u32(node, "ti,mbox-num-users",
-					 &num_users))
-			return -ENODEV;
+	if (of_property_read_u32(node, "ti,mbox-num-users", &num_users))
+		return -ENODEV;
 
-		if (of_property_read_u32(node, "ti,mbox-num-fifos",
-					 &num_fifos))
-			return -ENODEV;
+	if (of_property_read_u32(node, "ti,mbox-num-fifos", &num_fifos))
+		return -ENODEV;
 
-		info_count = of_get_available_child_count(node);
-		if (!info_count) {
-			dev_err(&pdev->dev, "no available mbox devices found\n");
-			return -ENODEV;
-		}
-	} else { /* non-DT device creation */
-		info_count = pdata->info_cnt;
-		info = pdata->info;
-		intr_type = pdata->intr_type;
-		num_users = pdata->num_users;
-		num_fifos = pdata->num_fifos;
+	info_count = of_get_available_child_count(node);
+	if (!info_count) {
+		dev_err(&pdev->dev, "no available mbox devices found\n");
+		return -ENODEV;
 	}
 
 	finfoblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*finfoblk),
@@ -750,38 +737,28 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	finfo = finfoblk;
 	child = NULL;
 	for (i = 0; i < info_count; i++, finfo++) {
-		if (node) {
-			child = of_get_next_available_child(node, child);
-			ret = of_property_read_u32_array(child, "ti,mbox-tx",
-							 tmp, ARRAY_SIZE(tmp));
-			if (ret)
-				return ret;
-			finfo->tx_id = tmp[0];
-			finfo->tx_irq = tmp[1];
-			finfo->tx_usr = tmp[2];
-
-			ret = of_property_read_u32_array(child, "ti,mbox-rx",
-							 tmp, ARRAY_SIZE(tmp));
-			if (ret)
-				return ret;
-			finfo->rx_id = tmp[0];
-			finfo->rx_irq = tmp[1];
-			finfo->rx_usr = tmp[2];
-
-			finfo->name = child->name;
-
-			if (of_find_property(child, "ti,mbox-send-noirq", NULL))
-				finfo->send_no_irq = true;
-		} else {
-			finfo->tx_id = info->tx_id;
-			finfo->rx_id = info->rx_id;
-			finfo->tx_usr = info->usr_id;
-			finfo->tx_irq = info->irq_id;
-			finfo->rx_usr = info->usr_id;
-			finfo->rx_irq = info->irq_id;
-			finfo->name = info->name;
-			info++;
-		}
+		child = of_get_next_available_child(node, child);
+		ret = of_property_read_u32_array(child, "ti,mbox-tx", tmp,
+						 ARRAY_SIZE(tmp));
+		if (ret)
+			return ret;
+		finfo->tx_id = tmp[0];
+		finfo->tx_irq = tmp[1];
+		finfo->tx_usr = tmp[2];
+
+		ret = of_property_read_u32_array(child, "ti,mbox-rx", tmp,
+						 ARRAY_SIZE(tmp));
+		if (ret)
+			return ret;
+		finfo->rx_id = tmp[0];
+		finfo->rx_irq = tmp[1];
+		finfo->rx_usr = tmp[2];
+
+		finfo->name = child->name;
+
+		if (of_find_property(child, "ti,mbox-send-noirq", NULL))
+			finfo->send_no_irq = true;
+
 		if (finfo->tx_id >= num_fifos || finfo->rx_id >= num_fifos ||
 		    finfo->tx_usr >= num_users || finfo->rx_usr >= num_users)
 			return -EINVAL;
@@ -796,6 +773,11 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	if (IS_ERR(mdev->mbox_base))
 		return PTR_ERR(mdev->mbox_base);
 
+	mdev->irq_ctx = devm_kzalloc(&pdev->dev, num_users * sizeof(u32),
+				     GFP_KERNEL);
+	if (!mdev->irq_ctx)
+		return -ENOMEM;
+
 	/* allocate one extra for marking end of list */
 	list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),
 			    GFP_KERNEL);
@@ -848,6 +830,7 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	mdev->dev = &pdev->dev;
 	mdev->num_users = num_users;
 	mdev->num_fifos = num_fifos;
+	mdev->intr_type = intr_type;
 	mdev->mboxes = list;
 
 	/* OMAP does not have a Tx-Done IRQ, but rather a Tx-Ready IRQ */
@@ -905,6 +888,7 @@ static struct platform_driver omap_mbox_driver = {
 	.remove	= omap_mbox_remove,
 	.driver	= {
 		.name = "omap-mailbox",
+		.pm = &omap_mbox_pm_ops,
 		.of_match_table = of_match_ptr(omap_mailbox_of_match),
 	},
 };

include/linux/omap-mailbox.h

@@ -21,8 +21,6 @@ struct mbox_client;
 struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl,
 					    const char *chan_name);
 
-void omap_mbox_save_ctx(struct mbox_chan *chan);
-void omap_mbox_restore_ctx(struct mbox_chan *chan);
 void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq);
 void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq);
 

include/linux/platform_data/mailbox-omap.h

@@ -1,58 +0,0 @@
-/*
- * mailbox-omap.h
- *
- * Copyright (C) 2013 Texas Instruments, Inc.
- *
- * 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.
- */
-
-#ifndef _PLAT_MAILBOX_H
-#define _PLAT_MAILBOX_H
-
-/* Interrupt register configuration types */
-#define MBOX_INTR_CFG_TYPE1	(0)
-#define MBOX_INTR_CFG_TYPE2	(1)
-
-/**
- * struct omap_mbox_dev_info - OMAP mailbox device attribute info
- * @name:	name of the mailbox device
- * @tx_id:	mailbox queue id used for transmitting messages
- * @rx_id:	mailbox queue id on which messages are received
- * @irq_id:	irq identifier number to use from the hwmod data
- * @usr_id:	mailbox user id for identifying the interrupt into
- *			the MPU interrupt controller.
- */
-struct omap_mbox_dev_info {
-	const char *name;
-	u32 tx_id;
-	u32 rx_id;
-	u32 irq_id;
-	u32 usr_id;
-};
-
-/**
- * struct omap_mbox_pdata - OMAP mailbox platform data
- * @intr_type:	type of interrupt configuration registers used
-			while programming mailbox queue interrupts
- * @num_users:	number of users (processor devices) that the mailbox
- *			h/w block can interrupt
- * @num_fifos:	number of h/w fifos within the mailbox h/w block
- * @info_cnt:	number of mailbox devices for the platform
- * @info:	array of mailbox device attributes
- */
-struct omap_mbox_pdata {
-	u32 intr_type;
-	u32 num_users;
-	u32 num_fifos;
-	u32 info_cnt;
-	struct omap_mbox_dev_info *info;
-};
-
-#endif /* _PLAT_MAILBOX_H */