1/*
2 * Tegra host1x Interrupt Management
3 *
4 * Copyright (C) 2010 Google, Inc.
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/interrupt.h>
21#include <linux/irq.h>
22#include <linux/io.h>
23
24#include "../intr.h"
25#include "../dev.h"
26
27/*
28 * Sync point threshold interrupt service function
29 * Handles sync point threshold triggers, in interrupt context
30 */
31static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
32{
33	unsigned int id = syncpt->id;
34	struct host1x *host = syncpt->host;
35
36	host1x_sync_writel(host, BIT_MASK(id),
37		HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(BIT_WORD(id)));
38	host1x_sync_writel(host, BIT_MASK(id),
39		HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id)));
40
41	queue_work(host->intr_wq, &syncpt->intr.work);
42}
43
44static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
45{
46	struct host1x *host = dev_id;
47	unsigned long reg;
48	int i, id;
49
50	for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
51		reg = host1x_sync_readl(host,
52			HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
53		for_each_set_bit(id, &reg, BITS_PER_LONG) {
54			struct host1x_syncpt *syncpt =
55				host->syncpt + (i * BITS_PER_LONG + id);
56			host1x_intr_syncpt_handle(syncpt);
57		}
58	}
59
60	return IRQ_HANDLED;
61}
62
63static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
64{
65	u32 i;
66
67	for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
68		host1x_sync_writel(host, 0xffffffffu,
69			HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
70		host1x_sync_writel(host, 0xffffffffu,
71			HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
72	}
73}
74
75static int _host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
76	void (*syncpt_thresh_work)(struct work_struct *))
77{
78	int i, err;
79
80	host1x_hw_intr_disable_all_syncpt_intrs(host);
81
82	for (i = 0; i < host->info->nb_pts; i++)
83		INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
84
85	err = devm_request_irq(host->dev, host->intr_syncpt_irq,
86			       syncpt_thresh_isr, IRQF_SHARED,
87			       "host1x_syncpt", host);
88	if (IS_ERR_VALUE(err)) {
89		WARN_ON(1);
90		return err;
91	}
92
93	/* disable the ip_busy_timeout. this prevents write drops */
94	host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);
95
96	/*
97	 * increase the auto-ack timout to the maximum value. 2d will hang
98	 * otherwise on Tegra2.
99	 */
100	host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);
101
102	/* update host clocks per usec */
103	host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
104
105	return 0;
106}
107
108static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
109	u32 id, u32 thresh)
110{
111	host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
112}
113
114static void _host1x_intr_enable_syncpt_intr(struct host1x *host, u32 id)
115{
116	host1x_sync_writel(host, BIT_MASK(id),
117		HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(BIT_WORD(id)));
118}
119
120static void _host1x_intr_disable_syncpt_intr(struct host1x *host, u32 id)
121{
122	host1x_sync_writel(host, BIT_MASK(id),
123		HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(BIT_WORD(id)));
124	host1x_sync_writel(host, BIT_MASK(id),
125		HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id)));
126}
127
128static int _host1x_free_syncpt_irq(struct host1x *host)
129{
130	devm_free_irq(host->dev, host->intr_syncpt_irq, host);
131	flush_workqueue(host->intr_wq);
132	return 0;
133}
134
135static const struct host1x_intr_ops host1x_intr_ops = {
136	.init_host_sync = _host1x_intr_init_host_sync,
137	.set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
138	.enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
139	.disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
140	.disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
141	.free_syncpt_irq = _host1x_free_syncpt_irq,
142};
143