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Hiroshi DOYU340a6142006-12-07 15:43:59 -08001/*
2 * OMAP mailbox driver
3 *
Hiroshi DOYUf48cca82009-03-23 18:07:24 -07004 * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
Suman Anna5040f532014-06-24 19:43:41 -05005 * Copyright (C) 2013-2014 Texas Instruments Inc.
Hiroshi DOYU340a6142006-12-07 15:43:59 -08006 *
Hiroshi DOYUf48cca82009-03-23 18:07:24 -07007 * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Suman Anna5040f532014-06-24 19:43:41 -05008 * Suman Anna <s-anna@ti.com>
Hiroshi DOYU340a6142006-12-07 15:43:59 -08009 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 *
24 */
25
Hiroshi DOYU340a6142006-12-07 15:43:59 -080026#include <linux/interrupt.h>
Felipe Contrerasb3e69142010-06-11 15:51:49 +000027#include <linux/spinlock.h>
28#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +000030#include <linux/kfifo.h>
31#include <linux/err.h>
Paul Gortmaker73017a52011-07-31 16:14:14 -040032#include <linux/module.h>
Suman Anna75288cc2014-09-10 14:20:59 -050033#include <linux/of_device.h>
Suman Anna5040f532014-06-24 19:43:41 -050034#include <linux/platform_device.h>
35#include <linux/pm_runtime.h>
36#include <linux/platform_data/mailbox-omap.h>
37#include <linux/omap-mailbox.h>
Suman Anna8841a662014-11-03 17:05:50 -060038#include <linux/mailbox_controller.h>
39#include <linux/mailbox_client.h>
Hiroshi DOYU8dff0fa2009-03-23 18:07:32 -070040
Dave Gerlach8e3c5952015-09-22 19:14:52 -050041#include "mailbox.h"
42
Suman Anna5040f532014-06-24 19:43:41 -050043#define MAILBOX_REVISION 0x000
44#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
45#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
46#define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
Hiroshi DOYU340a6142006-12-07 15:43:59 -080047
Suman Anna5040f532014-06-24 19:43:41 -050048#define OMAP2_MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
49#define OMAP2_MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
50
51#define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
52#define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
53#define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
54
55#define MAILBOX_IRQSTATUS(type, u) (type ? OMAP4_MAILBOX_IRQSTATUS(u) : \
56 OMAP2_MAILBOX_IRQSTATUS(u))
57#define MAILBOX_IRQENABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE(u) : \
58 OMAP2_MAILBOX_IRQENABLE(u))
59#define MAILBOX_IRQDISABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE_CLR(u) \
60 : OMAP2_MAILBOX_IRQENABLE(u))
61
62#define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
63#define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
64
65#define MBOX_REG_SIZE 0x120
66
67#define OMAP4_MBOX_REG_SIZE 0x130
68
69#define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
70#define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))
71
72struct omap_mbox_fifo {
73 unsigned long msg;
74 unsigned long fifo_stat;
75 unsigned long msg_stat;
Suman Anna5040f532014-06-24 19:43:41 -050076 unsigned long irqenable;
77 unsigned long irqstatus;
Suman Anna5040f532014-06-24 19:43:41 -050078 unsigned long irqdisable;
Suman Annabe3322e2014-06-24 19:43:42 -050079 u32 intr_bit;
Suman Anna5040f532014-06-24 19:43:41 -050080};
81
82struct omap_mbox_queue {
83 spinlock_t lock;
84 struct kfifo fifo;
85 struct work_struct work;
Suman Anna5040f532014-06-24 19:43:41 -050086 struct omap_mbox *mbox;
87 bool full;
88};
89
Suman Anna72c1c812014-06-24 19:43:43 -050090struct omap_mbox_device {
91 struct device *dev;
92 struct mutex cfg_lock;
93 void __iomem *mbox_base;
94 u32 num_users;
95 u32 num_fifos;
96 struct omap_mbox **mboxes;
Suman Anna8841a662014-11-03 17:05:50 -060097 struct mbox_controller controller;
Suman Anna72c1c812014-06-24 19:43:43 -050098 struct list_head elem;
99};
100
Suman Anna75288cc2014-09-10 14:20:59 -0500101struct omap_mbox_fifo_info {
102 int tx_id;
103 int tx_usr;
104 int tx_irq;
105
106 int rx_id;
107 int rx_usr;
108 int rx_irq;
109
110 const char *name;
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500111 bool send_no_irq;
Suman Anna75288cc2014-09-10 14:20:59 -0500112};
113
Suman Anna5040f532014-06-24 19:43:41 -0500114struct omap_mbox {
115 const char *name;
116 int irq;
Suman Anna8841a662014-11-03 17:05:50 -0600117 struct omap_mbox_queue *rxq;
Suman Anna5040f532014-06-24 19:43:41 -0500118 struct device *dev;
Suman Anna72c1c812014-06-24 19:43:43 -0500119 struct omap_mbox_device *parent;
Suman Annabe3322e2014-06-24 19:43:42 -0500120 struct omap_mbox_fifo tx_fifo;
121 struct omap_mbox_fifo rx_fifo;
122 u32 ctx[OMAP4_MBOX_NR_REGS];
123 u32 intr_type;
Suman Anna8841a662014-11-03 17:05:50 -0600124 struct mbox_chan *chan;
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500125 bool send_no_irq;
Suman Anna5040f532014-06-24 19:43:41 -0500126};
127
Suman Anna72c1c812014-06-24 19:43:43 -0500128/* global variables for the mailbox devices */
129static DEFINE_MUTEX(omap_mbox_devices_lock);
130static LIST_HEAD(omap_mbox_devices);
C A Subramaniam5f00ec62009-11-22 10:11:22 -0800131
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000132static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
133module_param(mbox_kfifo_size, uint, S_IRUGO);
134MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
135
Suman Anna8841a662014-11-03 17:05:50 -0600136static struct omap_mbox *mbox_chan_to_omap_mbox(struct mbox_chan *chan)
137{
138 if (!chan || !chan->con_priv)
139 return NULL;
140
141 return (struct omap_mbox *)chan->con_priv;
142}
143
Suman Anna72c1c812014-06-24 19:43:43 -0500144static inline
145unsigned int mbox_read_reg(struct omap_mbox_device *mdev, size_t ofs)
Suman Anna5040f532014-06-24 19:43:41 -0500146{
Suman Anna72c1c812014-06-24 19:43:43 -0500147 return __raw_readl(mdev->mbox_base + ofs);
Suman Anna5040f532014-06-24 19:43:41 -0500148}
149
Suman Anna72c1c812014-06-24 19:43:43 -0500150static inline
151void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
Suman Anna5040f532014-06-24 19:43:41 -0500152{
Suman Anna72c1c812014-06-24 19:43:43 -0500153 __raw_writel(val, mdev->mbox_base + ofs);
Suman Anna5040f532014-06-24 19:43:41 -0500154}
155
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700156/* Mailbox FIFO handle functions */
Suman Anna5040f532014-06-24 19:43:41 -0500157static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700158{
Suman Annabe3322e2014-06-24 19:43:42 -0500159 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
Suman Anna72c1c812014-06-24 19:43:43 -0500160 return (mbox_msg_t) mbox_read_reg(mbox->parent, fifo->msg);
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700161}
Suman Anna5040f532014-06-24 19:43:41 -0500162
163static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700164{
Suman Annabe3322e2014-06-24 19:43:42 -0500165 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
Suman Anna72c1c812014-06-24 19:43:43 -0500166 mbox_write_reg(mbox->parent, msg, fifo->msg);
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700167}
Suman Anna5040f532014-06-24 19:43:41 -0500168
169static int mbox_fifo_empty(struct omap_mbox *mbox)
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700170{
Suman Annabe3322e2014-06-24 19:43:42 -0500171 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
Suman Anna72c1c812014-06-24 19:43:43 -0500172 return (mbox_read_reg(mbox->parent, fifo->msg_stat) == 0);
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700173}
Suman Anna5040f532014-06-24 19:43:41 -0500174
175static int mbox_fifo_full(struct omap_mbox *mbox)
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700176{
Suman Annabe3322e2014-06-24 19:43:42 -0500177 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
Suman Anna72c1c812014-06-24 19:43:43 -0500178 return mbox_read_reg(mbox->parent, fifo->fifo_stat);
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700179}
180
181/* Mailbox IRQ handle functions */
Suman Anna5040f532014-06-24 19:43:41 -0500182static void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700183{
Suman Annabe3322e2014-06-24 19:43:42 -0500184 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
185 &mbox->tx_fifo : &mbox->rx_fifo;
186 u32 bit = fifo->intr_bit;
187 u32 irqstatus = fifo->irqstatus;
Suman Anna5040f532014-06-24 19:43:41 -0500188
Suman Anna72c1c812014-06-24 19:43:43 -0500189 mbox_write_reg(mbox->parent, bit, irqstatus);
Suman Anna5040f532014-06-24 19:43:41 -0500190
191 /* Flush posted write for irq status to avoid spurious interrupts */
Suman Anna72c1c812014-06-24 19:43:43 -0500192 mbox_read_reg(mbox->parent, irqstatus);
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700193}
Suman Anna5040f532014-06-24 19:43:41 -0500194
195static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700196{
Suman Annabe3322e2014-06-24 19:43:42 -0500197 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
198 &mbox->tx_fifo : &mbox->rx_fifo;
199 u32 bit = fifo->intr_bit;
200 u32 irqenable = fifo->irqenable;
201 u32 irqstatus = fifo->irqstatus;
202
Suman Anna72c1c812014-06-24 19:43:43 -0500203 u32 enable = mbox_read_reg(mbox->parent, irqenable);
204 u32 status = mbox_read_reg(mbox->parent, irqstatus);
Suman Anna5040f532014-06-24 19:43:41 -0500205
206 return (int)(enable & status & bit);
Hiroshi DOYU9ae0ee02009-03-23 18:07:26 -0700207}
208
Suman Anna8841a662014-11-03 17:05:50 -0600209void omap_mbox_save_ctx(struct mbox_chan *chan)
Suman Annac869c752013-03-12 17:55:29 -0500210{
Suman Anna5040f532014-06-24 19:43:41 -0500211 int i;
Suman Anna5040f532014-06-24 19:43:41 -0500212 int nr_regs;
Suman Anna8841a662014-11-03 17:05:50 -0600213 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
214
215 if (WARN_ON(!mbox))
216 return;
Suman Annac869c752013-03-12 17:55:29 -0500217
Suman Annabe3322e2014-06-24 19:43:42 -0500218 if (mbox->intr_type)
Suman Anna5040f532014-06-24 19:43:41 -0500219 nr_regs = OMAP4_MBOX_NR_REGS;
220 else
221 nr_regs = MBOX_NR_REGS;
222 for (i = 0; i < nr_regs; i++) {
Suman Anna72c1c812014-06-24 19:43:43 -0500223 mbox->ctx[i] = mbox_read_reg(mbox->parent, i * sizeof(u32));
Suman Anna5040f532014-06-24 19:43:41 -0500224
225 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
Suman Annabe3322e2014-06-24 19:43:42 -0500226 i, mbox->ctx[i]);
Suman Anna5040f532014-06-24 19:43:41 -0500227 }
Suman Annac869c752013-03-12 17:55:29 -0500228}
229EXPORT_SYMBOL(omap_mbox_save_ctx);
230
Suman Anna8841a662014-11-03 17:05:50 -0600231void omap_mbox_restore_ctx(struct mbox_chan *chan)
Suman Annac869c752013-03-12 17:55:29 -0500232{
Suman Anna5040f532014-06-24 19:43:41 -0500233 int i;
Suman Anna5040f532014-06-24 19:43:41 -0500234 int nr_regs;
Suman Anna8841a662014-11-03 17:05:50 -0600235 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
236
237 if (WARN_ON(!mbox))
238 return;
Suman Annac869c752013-03-12 17:55:29 -0500239
Suman Annabe3322e2014-06-24 19:43:42 -0500240 if (mbox->intr_type)
Suman Anna5040f532014-06-24 19:43:41 -0500241 nr_regs = OMAP4_MBOX_NR_REGS;
242 else
243 nr_regs = MBOX_NR_REGS;
244 for (i = 0; i < nr_regs; i++) {
Suman Anna72c1c812014-06-24 19:43:43 -0500245 mbox_write_reg(mbox->parent, mbox->ctx[i], i * sizeof(u32));
Suman Anna5040f532014-06-24 19:43:41 -0500246 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
Suman Annabe3322e2014-06-24 19:43:42 -0500247 i, mbox->ctx[i]);
Suman Anna5040f532014-06-24 19:43:41 -0500248 }
Suman Annac869c752013-03-12 17:55:29 -0500249}
250EXPORT_SYMBOL(omap_mbox_restore_ctx);
251
Suman Anna8841a662014-11-03 17:05:50 -0600252static void _omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
Suman Annac869c752013-03-12 17:55:29 -0500253{
Suman Annabe3322e2014-06-24 19:43:42 -0500254 u32 l;
255 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
256 &mbox->tx_fifo : &mbox->rx_fifo;
257 u32 bit = fifo->intr_bit;
258 u32 irqenable = fifo->irqenable;
Suman Anna5040f532014-06-24 19:43:41 -0500259
Suman Anna72c1c812014-06-24 19:43:43 -0500260 l = mbox_read_reg(mbox->parent, irqenable);
Suman Anna5040f532014-06-24 19:43:41 -0500261 l |= bit;
Suman Anna72c1c812014-06-24 19:43:43 -0500262 mbox_write_reg(mbox->parent, l, irqenable);
Suman Annac869c752013-03-12 17:55:29 -0500263}
Suman Annac869c752013-03-12 17:55:29 -0500264
Suman Anna8841a662014-11-03 17:05:50 -0600265static void _omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
Suman Annac869c752013-03-12 17:55:29 -0500266{
Suman Annabe3322e2014-06-24 19:43:42 -0500267 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
268 &mbox->tx_fifo : &mbox->rx_fifo;
269 u32 bit = fifo->intr_bit;
270 u32 irqdisable = fifo->irqdisable;
Suman Anna5040f532014-06-24 19:43:41 -0500271
272 /*
273 * Read and update the interrupt configuration register for pre-OMAP4.
274 * OMAP4 and later SoCs have a dedicated interrupt disabling register.
275 */
Suman Annabe3322e2014-06-24 19:43:42 -0500276 if (!mbox->intr_type)
Suman Anna72c1c812014-06-24 19:43:43 -0500277 bit = mbox_read_reg(mbox->parent, irqdisable) & ~bit;
Suman Anna5040f532014-06-24 19:43:41 -0500278
Suman Anna72c1c812014-06-24 19:43:43 -0500279 mbox_write_reg(mbox->parent, bit, irqdisable);
Suman Annac869c752013-03-12 17:55:29 -0500280}
Suman Annac869c752013-03-12 17:55:29 -0500281
Suman Anna8841a662014-11-03 17:05:50 -0600282void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800283{
Suman Anna8841a662014-11-03 17:05:50 -0600284 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800285
Suman Anna8841a662014-11-03 17:05:50 -0600286 if (WARN_ON(!mbox))
287 return;
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000288
Suman Anna8841a662014-11-03 17:05:50 -0600289 _omap_mbox_enable_irq(mbox, irq);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800290}
Suman Anna8841a662014-11-03 17:05:50 -0600291EXPORT_SYMBOL(omap_mbox_enable_irq);
292
293void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
294{
295 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
296
297 if (WARN_ON(!mbox))
298 return;
299
300 _omap_mbox_disable_irq(mbox, irq);
301}
302EXPORT_SYMBOL(omap_mbox_disable_irq);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800303
304/*
305 * Message receiver(workqueue)
306 */
307static void mbox_rx_work(struct work_struct *work)
308{
309 struct omap_mbox_queue *mq =
310 container_of(work, struct omap_mbox_queue, work);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800311 mbox_msg_t msg;
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000312 int len;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800313
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000314 while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
315 len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
316 WARN_ON(len != sizeof(msg));
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800317
Suman Anna8841a662014-11-03 17:05:50 -0600318 mbox_chan_received_data(mq->mbox->chan, (void *)msg);
Fernando Guzman Lugod2295042010-11-29 20:24:11 +0000319 spin_lock_irq(&mq->lock);
320 if (mq->full) {
321 mq->full = false;
Suman Anna8841a662014-11-03 17:05:50 -0600322 _omap_mbox_enable_irq(mq->mbox, IRQ_RX);
Fernando Guzman Lugod2295042010-11-29 20:24:11 +0000323 }
324 spin_unlock_irq(&mq->lock);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800325 }
326}
327
328/*
329 * Mailbox interrupt handler
330 */
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800331static void __mbox_tx_interrupt(struct omap_mbox *mbox)
332{
Suman Anna8841a662014-11-03 17:05:50 -0600333 _omap_mbox_disable_irq(mbox, IRQ_TX);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800334 ack_mbox_irq(mbox, IRQ_TX);
Suman Anna8841a662014-11-03 17:05:50 -0600335 mbox_chan_txdone(mbox->chan, 0);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800336}
337
338static void __mbox_rx_interrupt(struct omap_mbox *mbox)
339{
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000340 struct omap_mbox_queue *mq = mbox->rxq;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800341 mbox_msg_t msg;
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000342 int len;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800343
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800344 while (!mbox_fifo_empty(mbox)) {
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000345 if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
Suman Anna8841a662014-11-03 17:05:50 -0600346 _omap_mbox_disable_irq(mbox, IRQ_RX);
Fernando Guzman Lugod2295042010-11-29 20:24:11 +0000347 mq->full = true;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800348 goto nomem;
Fernando Guzman Lugo1ea5d6d2010-02-08 13:35:40 -0600349 }
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800350
351 msg = mbox_fifo_read(mbox);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800352
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000353 len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
354 WARN_ON(len != sizeof(msg));
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800355 }
356
357 /* no more messages in the fifo. clear IRQ source. */
358 ack_mbox_irq(mbox, IRQ_RX);
Hiroshi DOYUf48cca82009-03-23 18:07:24 -0700359nomem:
Tejun Heoc4873002011-01-26 12:12:50 +0100360 schedule_work(&mbox->rxq->work);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800361}
362
363static irqreturn_t mbox_interrupt(int irq, void *p)
364{
Jeff Garzik2a7057e2007-10-26 05:40:22 -0400365 struct omap_mbox *mbox = p;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800366
367 if (is_mbox_irq(mbox, IRQ_TX))
368 __mbox_tx_interrupt(mbox);
369
370 if (is_mbox_irq(mbox, IRQ_RX))
371 __mbox_rx_interrupt(mbox);
372
373 return IRQ_HANDLED;
374}
375
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800376static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
Suman Anna8841a662014-11-03 17:05:50 -0600377 void (*work)(struct work_struct *))
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800378{
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800379 struct omap_mbox_queue *mq;
380
Suman Anna8841a662014-11-03 17:05:50 -0600381 if (!work)
382 return NULL;
383
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800384 mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
385 if (!mq)
386 return NULL;
387
388 spin_lock_init(&mq->lock);
389
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000390 if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800391 goto error;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800392
Suman Anna8841a662014-11-03 17:05:50 -0600393 INIT_WORK(&mq->work, work);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800394 return mq;
Suman Anna8841a662014-11-03 17:05:50 -0600395
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800396error:
397 kfree(mq);
398 return NULL;
399}
400
401static void mbox_queue_free(struct omap_mbox_queue *q)
402{
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000403 kfifo_free(&q->fifo);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800404 kfree(q);
405}
406
Hiroshi DOYUc7c158e2009-11-22 10:11:19 -0800407static int omap_mbox_startup(struct omap_mbox *mbox)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800408{
C A Subramaniam5f00ec62009-11-22 10:11:22 -0800409 int ret = 0;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800410 struct omap_mbox_queue *mq;
411
Suman Anna8841a662014-11-03 17:05:50 -0600412 mq = mbox_queue_alloc(mbox, mbox_rx_work);
413 if (!mq)
414 return -ENOMEM;
415 mbox->rxq = mq;
416 mq->mbox = mbox;
C A Subramaniam5f00ec62009-11-22 10:11:22 -0800417
Suman Anna8841a662014-11-03 17:05:50 -0600418 ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
419 mbox->name, mbox);
420 if (unlikely(ret)) {
421 pr_err("failed to register mailbox interrupt:%d\n", ret);
422 goto fail_request_irq;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800423 }
Suman Anna8841a662014-11-03 17:05:50 -0600424
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500425 if (mbox->send_no_irq)
426 mbox->chan->txdone_method = TXDONE_BY_ACK;
427
Suman Anna8841a662014-11-03 17:05:50 -0600428 _omap_mbox_enable_irq(mbox, IRQ_RX);
429
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800430 return 0;
431
Suman Annaecf305c2013-02-01 20:37:06 -0600432fail_request_irq:
433 mbox_queue_free(mbox->rxq);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800434 return ret;
435}
436
437static void omap_mbox_fini(struct omap_mbox *mbox)
438{
Suman Anna8841a662014-11-03 17:05:50 -0600439 _omap_mbox_disable_irq(mbox, IRQ_RX);
440 free_irq(mbox->irq, mbox);
441 flush_work(&mbox->rxq->work);
442 mbox_queue_free(mbox->rxq);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800443}
444
Suman Anna72c1c812014-06-24 19:43:43 -0500445static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
446 const char *mbox_name)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800447{
Kevin Hilmanc0377322011-02-11 19:56:43 +0000448 struct omap_mbox *_mbox, *mbox = NULL;
Suman Anna72c1c812014-06-24 19:43:43 -0500449 struct omap_mbox **mboxes = mdev->mboxes;
450 int i;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800451
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000452 if (!mboxes)
Suman Anna72c1c812014-06-24 19:43:43 -0500453 return NULL;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800454
Kevin Hilmanc0377322011-02-11 19:56:43 +0000455 for (i = 0; (_mbox = mboxes[i]); i++) {
Suman Anna72c1c812014-06-24 19:43:43 -0500456 if (!strcmp(_mbox->name, mbox_name)) {
Kevin Hilmanc0377322011-02-11 19:56:43 +0000457 mbox = _mbox;
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000458 break;
Kevin Hilmanc0377322011-02-11 19:56:43 +0000459 }
460 }
Suman Anna72c1c812014-06-24 19:43:43 -0500461 return mbox;
462}
463
Suman Anna8841a662014-11-03 17:05:50 -0600464struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl,
465 const char *chan_name)
Suman Anna72c1c812014-06-24 19:43:43 -0500466{
Suman Anna8841a662014-11-03 17:05:50 -0600467 struct device *dev = cl->dev;
Suman Anna72c1c812014-06-24 19:43:43 -0500468 struct omap_mbox *mbox = NULL;
469 struct omap_mbox_device *mdev;
Suman Anna8841a662014-11-03 17:05:50 -0600470 struct mbox_chan *chan;
471 unsigned long flags;
Suman Anna72c1c812014-06-24 19:43:43 -0500472 int ret;
473
Suman Anna8841a662014-11-03 17:05:50 -0600474 if (!dev)
475 return ERR_PTR(-ENODEV);
476
477 if (dev->of_node) {
478 pr_err("%s: please use mbox_request_channel(), this API is supported only for OMAP non-DT usage\n",
479 __func__);
480 return ERR_PTR(-ENODEV);
481 }
482
Suman Anna72c1c812014-06-24 19:43:43 -0500483 mutex_lock(&omap_mbox_devices_lock);
484 list_for_each_entry(mdev, &omap_mbox_devices, elem) {
Suman Anna8841a662014-11-03 17:05:50 -0600485 mbox = omap_mbox_device_find(mdev, chan_name);
Suman Anna72c1c812014-06-24 19:43:43 -0500486 if (mbox)
487 break;
488 }
489 mutex_unlock(&omap_mbox_devices_lock);
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000490
Suman Anna8841a662014-11-03 17:05:50 -0600491 if (!mbox || !mbox->chan)
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000492 return ERR_PTR(-ENOENT);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800493
Suman Anna8841a662014-11-03 17:05:50 -0600494 chan = mbox->chan;
495 spin_lock_irqsave(&chan->lock, flags);
496 chan->msg_free = 0;
497 chan->msg_count = 0;
498 chan->active_req = NULL;
499 chan->cl = cl;
500 init_completion(&chan->tx_complete);
501 spin_unlock_irqrestore(&chan->lock, flags);
Kanigeri, Hari58256302010-11-29 20:24:14 +0000502
Suman Anna8841a662014-11-03 17:05:50 -0600503 ret = chan->mbox->ops->startup(chan);
Juan Gutierrez1d8a0e92012-05-13 15:33:04 +0300504 if (ret) {
Suman Anna8841a662014-11-03 17:05:50 -0600505 pr_err("Unable to startup the chan (%d)\n", ret);
506 mbox_free_channel(chan);
507 chan = ERR_PTR(ret);
Juan Gutierrez1d8a0e92012-05-13 15:33:04 +0300508 }
509
Suman Anna8841a662014-11-03 17:05:50 -0600510 return chan;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800511}
Suman Anna8841a662014-11-03 17:05:50 -0600512EXPORT_SYMBOL(omap_mbox_request_channel);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800513
Hiroshi DOYU6b233982010-05-18 16:15:32 +0300514static struct class omap_mbox_class = { .name = "mbox", };
515
Suman Anna72c1c812014-06-24 19:43:43 -0500516static int omap_mbox_register(struct omap_mbox_device *mdev)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800517{
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000518 int ret;
519 int i;
Suman Anna72c1c812014-06-24 19:43:43 -0500520 struct omap_mbox **mboxes;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800521
Suman Anna72c1c812014-06-24 19:43:43 -0500522 if (!mdev || !mdev->mboxes)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800523 return -EINVAL;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800524
Suman Anna72c1c812014-06-24 19:43:43 -0500525 mboxes = mdev->mboxes;
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000526 for (i = 0; mboxes[i]; i++) {
527 struct omap_mbox *mbox = mboxes[i];
Suman Anna8841a662014-11-03 17:05:50 -0600528 mbox->dev = device_create(&omap_mbox_class, mdev->dev,
529 0, mbox, "%s", mbox->name);
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000530 if (IS_ERR(mbox->dev)) {
531 ret = PTR_ERR(mbox->dev);
532 goto err_out;
533 }
Hiroshi DOYUf48cca82009-03-23 18:07:24 -0700534 }
Suman Anna72c1c812014-06-24 19:43:43 -0500535
536 mutex_lock(&omap_mbox_devices_lock);
537 list_add(&mdev->elem, &omap_mbox_devices);
538 mutex_unlock(&omap_mbox_devices_lock);
539
Suman Anna8841a662014-11-03 17:05:50 -0600540 ret = mbox_controller_register(&mdev->controller);
Hiroshi DOYUf48cca82009-03-23 18:07:24 -0700541
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000542err_out:
Suman Anna8841a662014-11-03 17:05:50 -0600543 if (ret) {
544 while (i--)
545 device_unregister(mboxes[i]->dev);
546 }
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800547 return ret;
548}
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800549
Suman Anna72c1c812014-06-24 19:43:43 -0500550static int omap_mbox_unregister(struct omap_mbox_device *mdev)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800551{
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000552 int i;
Suman Anna72c1c812014-06-24 19:43:43 -0500553 struct omap_mbox **mboxes;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800554
Suman Anna72c1c812014-06-24 19:43:43 -0500555 if (!mdev || !mdev->mboxes)
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000556 return -EINVAL;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800557
Suman Anna72c1c812014-06-24 19:43:43 -0500558 mutex_lock(&omap_mbox_devices_lock);
559 list_del(&mdev->elem);
560 mutex_unlock(&omap_mbox_devices_lock);
561
Suman Anna8841a662014-11-03 17:05:50 -0600562 mbox_controller_unregister(&mdev->controller);
563
Suman Anna72c1c812014-06-24 19:43:43 -0500564 mboxes = mdev->mboxes;
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000565 for (i = 0; mboxes[i]; i++)
566 device_unregister(mboxes[i]->dev);
Felipe Contreras9c80c8c2010-06-11 15:51:46 +0000567 return 0;
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800568}
Suman Anna5040f532014-06-24 19:43:41 -0500569
Suman Anna8841a662014-11-03 17:05:50 -0600570static int omap_mbox_chan_startup(struct mbox_chan *chan)
571{
572 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
573 struct omap_mbox_device *mdev = mbox->parent;
574 int ret = 0;
575
576 mutex_lock(&mdev->cfg_lock);
577 pm_runtime_get_sync(mdev->dev);
578 ret = omap_mbox_startup(mbox);
579 if (ret)
580 pm_runtime_put_sync(mdev->dev);
581 mutex_unlock(&mdev->cfg_lock);
582 return ret;
583}
584
585static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
586{
587 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
588 struct omap_mbox_device *mdev = mbox->parent;
589
590 mutex_lock(&mdev->cfg_lock);
591 omap_mbox_fini(mbox);
592 pm_runtime_put_sync(mdev->dev);
593 mutex_unlock(&mdev->cfg_lock);
594}
595
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500596static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
Suman Anna8841a662014-11-03 17:05:50 -0600597{
Suman Anna8841a662014-11-03 17:05:50 -0600598 int ret = -EBUSY;
599
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500600 if (!mbox_fifo_full(mbox)) {
601 _omap_mbox_enable_irq(mbox, IRQ_RX);
602 mbox_fifo_write(mbox, (mbox_msg_t)data);
603 ret = 0;
604 _omap_mbox_disable_irq(mbox, IRQ_RX);
605
606 /* we must read and ack the interrupt directly from here */
607 mbox_fifo_read(mbox);
608 ack_mbox_irq(mbox, IRQ_RX);
609 }
610
611 return ret;
612}
613
614static int omap_mbox_chan_send(struct omap_mbox *mbox, void *data)
615{
616 int ret = -EBUSY;
Suman Anna8841a662014-11-03 17:05:50 -0600617
618 if (!mbox_fifo_full(mbox)) {
619 mbox_fifo_write(mbox, (mbox_msg_t)data);
620 ret = 0;
621 }
622
623 /* always enable the interrupt */
624 _omap_mbox_enable_irq(mbox, IRQ_TX);
625 return ret;
626}
627
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500628static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
629{
630 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
631 int ret;
632
633 if (!mbox)
634 return -EINVAL;
635
636 if (mbox->send_no_irq)
637 ret = omap_mbox_chan_send_noirq(mbox, data);
638 else
639 ret = omap_mbox_chan_send(mbox, data);
640
641 return ret;
642}
643
Andrew Bresticker05ae7972015-05-04 10:36:35 -0700644static const struct mbox_chan_ops omap_mbox_chan_ops = {
Suman Anna8841a662014-11-03 17:05:50 -0600645 .startup = omap_mbox_chan_startup,
646 .send_data = omap_mbox_chan_send_data,
647 .shutdown = omap_mbox_chan_shutdown,
648};
649
Suman Anna75288cc2014-09-10 14:20:59 -0500650static const struct of_device_id omap_mailbox_of_match[] = {
651 {
652 .compatible = "ti,omap2-mailbox",
653 .data = (void *)MBOX_INTR_CFG_TYPE1,
654 },
655 {
656 .compatible = "ti,omap3-mailbox",
657 .data = (void *)MBOX_INTR_CFG_TYPE1,
658 },
659 {
660 .compatible = "ti,omap4-mailbox",
661 .data = (void *)MBOX_INTR_CFG_TYPE2,
662 },
663 {
664 /* end */
665 },
666};
667MODULE_DEVICE_TABLE(of, omap_mailbox_of_match);
668
Suman Anna8841a662014-11-03 17:05:50 -0600669static struct mbox_chan *omap_mbox_of_xlate(struct mbox_controller *controller,
670 const struct of_phandle_args *sp)
671{
672 phandle phandle = sp->args[0];
673 struct device_node *node;
674 struct omap_mbox_device *mdev;
675 struct omap_mbox *mbox;
676
677 mdev = container_of(controller, struct omap_mbox_device, controller);
678 if (WARN_ON(!mdev))
Benson Leung2d805fc2015-05-04 10:36:36 -0700679 return ERR_PTR(-EINVAL);
Suman Anna8841a662014-11-03 17:05:50 -0600680
681 node = of_find_node_by_phandle(phandle);
682 if (!node) {
683 pr_err("%s: could not find node phandle 0x%x\n",
684 __func__, phandle);
Benson Leung2d805fc2015-05-04 10:36:36 -0700685 return ERR_PTR(-ENODEV);
Suman Anna8841a662014-11-03 17:05:50 -0600686 }
687
688 mbox = omap_mbox_device_find(mdev, node->name);
689 of_node_put(node);
Benson Leung2d805fc2015-05-04 10:36:36 -0700690 return mbox ? mbox->chan : ERR_PTR(-ENOENT);
Suman Anna8841a662014-11-03 17:05:50 -0600691}
692
Suman Anna5040f532014-06-24 19:43:41 -0500693static int omap_mbox_probe(struct platform_device *pdev)
694{
695 struct resource *mem;
696 int ret;
Suman Anna8841a662014-11-03 17:05:50 -0600697 struct mbox_chan *chnls;
Suman Anna5040f532014-06-24 19:43:41 -0500698 struct omap_mbox **list, *mbox, *mboxblk;
Suman Anna5040f532014-06-24 19:43:41 -0500699 struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
Suman Anna75288cc2014-09-10 14:20:59 -0500700 struct omap_mbox_dev_info *info = NULL;
701 struct omap_mbox_fifo_info *finfo, *finfoblk;
Suman Anna72c1c812014-06-24 19:43:43 -0500702 struct omap_mbox_device *mdev;
Suman Annabe3322e2014-06-24 19:43:42 -0500703 struct omap_mbox_fifo *fifo;
Suman Anna75288cc2014-09-10 14:20:59 -0500704 struct device_node *node = pdev->dev.of_node;
705 struct device_node *child;
706 const struct of_device_id *match;
707 u32 intr_type, info_count;
708 u32 num_users, num_fifos;
709 u32 tmp[3];
Suman Anna5040f532014-06-24 19:43:41 -0500710 u32 l;
711 int i;
712
Suman Anna75288cc2014-09-10 14:20:59 -0500713 if (!node && (!pdata || !pdata->info_cnt || !pdata->info)) {
Suman Anna5040f532014-06-24 19:43:41 -0500714 pr_err("%s: platform not supported\n", __func__);
715 return -ENODEV;
716 }
717
Suman Anna75288cc2014-09-10 14:20:59 -0500718 if (node) {
719 match = of_match_device(omap_mailbox_of_match, &pdev->dev);
720 if (!match)
721 return -ENODEV;
722 intr_type = (u32)match->data;
723
724 if (of_property_read_u32(node, "ti,mbox-num-users",
725 &num_users))
726 return -ENODEV;
727
728 if (of_property_read_u32(node, "ti,mbox-num-fifos",
729 &num_fifos))
730 return -ENODEV;
731
732 info_count = of_get_available_child_count(node);
733 if (!info_count) {
734 dev_err(&pdev->dev, "no available mbox devices found\n");
735 return -ENODEV;
736 }
737 } else { /* non-DT device creation */
738 info_count = pdata->info_cnt;
739 info = pdata->info;
740 intr_type = pdata->intr_type;
741 num_users = pdata->num_users;
742 num_fifos = pdata->num_fifos;
743 }
744
745 finfoblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*finfoblk),
746 GFP_KERNEL);
747 if (!finfoblk)
748 return -ENOMEM;
749
750 finfo = finfoblk;
751 child = NULL;
752 for (i = 0; i < info_count; i++, finfo++) {
753 if (node) {
754 child = of_get_next_available_child(node, child);
755 ret = of_property_read_u32_array(child, "ti,mbox-tx",
756 tmp, ARRAY_SIZE(tmp));
757 if (ret)
758 return ret;
759 finfo->tx_id = tmp[0];
760 finfo->tx_irq = tmp[1];
761 finfo->tx_usr = tmp[2];
762
763 ret = of_property_read_u32_array(child, "ti,mbox-rx",
764 tmp, ARRAY_SIZE(tmp));
765 if (ret)
766 return ret;
767 finfo->rx_id = tmp[0];
768 finfo->rx_irq = tmp[1];
769 finfo->rx_usr = tmp[2];
770
771 finfo->name = child->name;
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500772
773 if (of_find_property(child, "ti,mbox-send-noirq", NULL))
774 finfo->send_no_irq = true;
Suman Anna75288cc2014-09-10 14:20:59 -0500775 } else {
776 finfo->tx_id = info->tx_id;
777 finfo->rx_id = info->rx_id;
778 finfo->tx_usr = info->usr_id;
779 finfo->tx_irq = info->irq_id;
780 finfo->rx_usr = info->usr_id;
781 finfo->rx_irq = info->irq_id;
782 finfo->name = info->name;
783 info++;
784 }
785 if (finfo->tx_id >= num_fifos || finfo->rx_id >= num_fifos ||
786 finfo->tx_usr >= num_users || finfo->rx_usr >= num_users)
787 return -EINVAL;
788 }
789
Suman Anna72c1c812014-06-24 19:43:43 -0500790 mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
791 if (!mdev)
792 return -ENOMEM;
793
794 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
795 mdev->mbox_base = devm_ioremap_resource(&pdev->dev, mem);
796 if (IS_ERR(mdev->mbox_base))
797 return PTR_ERR(mdev->mbox_base);
798
Suman Anna5040f532014-06-24 19:43:41 -0500799 /* allocate one extra for marking end of list */
Suman Anna75288cc2014-09-10 14:20:59 -0500800 list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),
Suman Anna5040f532014-06-24 19:43:41 -0500801 GFP_KERNEL);
802 if (!list)
803 return -ENOMEM;
804
Suman Anna8841a662014-11-03 17:05:50 -0600805 chnls = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*chnls),
806 GFP_KERNEL);
807 if (!chnls)
808 return -ENOMEM;
809
Suman Anna75288cc2014-09-10 14:20:59 -0500810 mboxblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*mbox),
Suman Anna5040f532014-06-24 19:43:41 -0500811 GFP_KERNEL);
812 if (!mboxblk)
813 return -ENOMEM;
814
Suman Anna5040f532014-06-24 19:43:41 -0500815 mbox = mboxblk;
Suman Anna75288cc2014-09-10 14:20:59 -0500816 finfo = finfoblk;
817 for (i = 0; i < info_count; i++, finfo++) {
Suman Annabe3322e2014-06-24 19:43:42 -0500818 fifo = &mbox->tx_fifo;
Suman Anna75288cc2014-09-10 14:20:59 -0500819 fifo->msg = MAILBOX_MESSAGE(finfo->tx_id);
820 fifo->fifo_stat = MAILBOX_FIFOSTATUS(finfo->tx_id);
821 fifo->intr_bit = MAILBOX_IRQ_NOTFULL(finfo->tx_id);
822 fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->tx_usr);
823 fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->tx_usr);
824 fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->tx_usr);
Suman Anna5040f532014-06-24 19:43:41 -0500825
Suman Annabe3322e2014-06-24 19:43:42 -0500826 fifo = &mbox->rx_fifo;
Suman Anna75288cc2014-09-10 14:20:59 -0500827 fifo->msg = MAILBOX_MESSAGE(finfo->rx_id);
828 fifo->msg_stat = MAILBOX_MSGSTATUS(finfo->rx_id);
829 fifo->intr_bit = MAILBOX_IRQ_NEWMSG(finfo->rx_id);
830 fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->rx_usr);
831 fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->rx_usr);
832 fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->rx_usr);
Suman Annabe3322e2014-06-24 19:43:42 -0500833
Dave Gerlach8e3c5952015-09-22 19:14:52 -0500834 mbox->send_no_irq = finfo->send_no_irq;
Suman Annabe3322e2014-06-24 19:43:42 -0500835 mbox->intr_type = intr_type;
836
Suman Anna72c1c812014-06-24 19:43:43 -0500837 mbox->parent = mdev;
Suman Anna75288cc2014-09-10 14:20:59 -0500838 mbox->name = finfo->name;
839 mbox->irq = platform_get_irq(pdev, finfo->tx_irq);
Suman Anna5040f532014-06-24 19:43:41 -0500840 if (mbox->irq < 0)
841 return mbox->irq;
Suman Anna8841a662014-11-03 17:05:50 -0600842 mbox->chan = &chnls[i];
843 chnls[i].con_priv = mbox;
Suman Anna5040f532014-06-24 19:43:41 -0500844 list[i] = mbox++;
845 }
846
Suman Anna72c1c812014-06-24 19:43:43 -0500847 mutex_init(&mdev->cfg_lock);
848 mdev->dev = &pdev->dev;
Suman Anna75288cc2014-09-10 14:20:59 -0500849 mdev->num_users = num_users;
850 mdev->num_fifos = num_fifos;
Suman Anna72c1c812014-06-24 19:43:43 -0500851 mdev->mboxes = list;
Suman Anna8841a662014-11-03 17:05:50 -0600852
853 /* OMAP does not have a Tx-Done IRQ, but rather a Tx-Ready IRQ */
854 mdev->controller.txdone_irq = true;
855 mdev->controller.dev = mdev->dev;
856 mdev->controller.ops = &omap_mbox_chan_ops;
857 mdev->controller.chans = chnls;
858 mdev->controller.num_chans = info_count;
859 mdev->controller.of_xlate = omap_mbox_of_xlate;
Suman Anna72c1c812014-06-24 19:43:43 -0500860 ret = omap_mbox_register(mdev);
Suman Anna5040f532014-06-24 19:43:41 -0500861 if (ret)
862 return ret;
863
Suman Anna72c1c812014-06-24 19:43:43 -0500864 platform_set_drvdata(pdev, mdev);
865 pm_runtime_enable(mdev->dev);
Suman Anna5040f532014-06-24 19:43:41 -0500866
Suman Anna72c1c812014-06-24 19:43:43 -0500867 ret = pm_runtime_get_sync(mdev->dev);
Suman Anna5040f532014-06-24 19:43:41 -0500868 if (ret < 0) {
Suman Anna72c1c812014-06-24 19:43:43 -0500869 pm_runtime_put_noidle(mdev->dev);
Suman Anna5040f532014-06-24 19:43:41 -0500870 goto unregister;
871 }
872
873 /*
874 * just print the raw revision register, the format is not
875 * uniform across all SoCs
876 */
Suman Anna72c1c812014-06-24 19:43:43 -0500877 l = mbox_read_reg(mdev, MAILBOX_REVISION);
878 dev_info(mdev->dev, "omap mailbox rev 0x%x\n", l);
Suman Anna5040f532014-06-24 19:43:41 -0500879
Suman Anna72c1c812014-06-24 19:43:43 -0500880 ret = pm_runtime_put_sync(mdev->dev);
Suman Anna5040f532014-06-24 19:43:41 -0500881 if (ret < 0)
882 goto unregister;
883
Suman Anna75288cc2014-09-10 14:20:59 -0500884 devm_kfree(&pdev->dev, finfoblk);
Suman Anna5040f532014-06-24 19:43:41 -0500885 return 0;
886
887unregister:
Suman Anna72c1c812014-06-24 19:43:43 -0500888 pm_runtime_disable(mdev->dev);
889 omap_mbox_unregister(mdev);
Suman Anna5040f532014-06-24 19:43:41 -0500890 return ret;
891}
892
893static int omap_mbox_remove(struct platform_device *pdev)
894{
Suman Anna72c1c812014-06-24 19:43:43 -0500895 struct omap_mbox_device *mdev = platform_get_drvdata(pdev);
896
897 pm_runtime_disable(mdev->dev);
898 omap_mbox_unregister(mdev);
Suman Anna5040f532014-06-24 19:43:41 -0500899
900 return 0;
901}
902
903static struct platform_driver omap_mbox_driver = {
904 .probe = omap_mbox_probe,
905 .remove = omap_mbox_remove,
906 .driver = {
907 .name = "omap-mailbox",
Suman Anna75288cc2014-09-10 14:20:59 -0500908 .of_match_table = of_match_ptr(omap_mailbox_of_match),
Suman Anna5040f532014-06-24 19:43:41 -0500909 },
910};
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800911
Hiroshi DOYUc7c158e2009-11-22 10:11:19 -0800912static int __init omap_mbox_init(void)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800913{
Hiroshi DOYU6b233982010-05-18 16:15:32 +0300914 int err;
915
916 err = class_register(&omap_mbox_class);
917 if (err)
918 return err;
919
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000920 /* kfifo size sanity check: alignment and minimal size */
921 mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
Kanigeri, Hariab66ac32010-11-29 20:24:12 +0000922 mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
923 sizeof(mbox_msg_t));
Ohad Ben-Cohenb5bebe42010-05-05 15:33:09 +0000924
Suman Anna5040f532014-06-24 19:43:41 -0500925 return platform_driver_register(&omap_mbox_driver);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800926}
Hiroshi DOYU6b233982010-05-18 16:15:32 +0300927subsys_initcall(omap_mbox_init);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800928
Hiroshi DOYUc7c158e2009-11-22 10:11:19 -0800929static void __exit omap_mbox_exit(void)
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800930{
Suman Anna5040f532014-06-24 19:43:41 -0500931 platform_driver_unregister(&omap_mbox_driver);
Hiroshi DOYU6b233982010-05-18 16:15:32 +0300932 class_unregister(&omap_mbox_class);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800933}
Hiroshi DOYUc7c158e2009-11-22 10:11:19 -0800934module_exit(omap_mbox_exit);
Hiroshi DOYU340a6142006-12-07 15:43:59 -0800935
Hiroshi DOYUf48cca82009-03-23 18:07:24 -0700936MODULE_LICENSE("GPL v2");
937MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
Ohad Ben-Cohenf3753252010-05-05 15:33:07 +0000938MODULE_AUTHOR("Toshihiro Kobayashi");
939MODULE_AUTHOR("Hiroshi DOYU");