1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Interrupt Management
4 *
5 * Copyright (C) 2010 Google, Inc.
6 * Copyright (c) 2010-2013, NVIDIA Corporation.
7 */
8
9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/io.h>
12
13#include "../intr.h"
14#include "../dev.h"
15
16/*
17 * Sync point threshold interrupt service function
18 * Handles sync point threshold triggers, in interrupt context
19 */
20static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
21{
22	unsigned int id = syncpt->id;
23	struct host1x *host = syncpt->host;
24
25	host1x_sync_writel(host, BIT(id % 32),
26		HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
27	host1x_sync_writel(host, BIT(id % 32),
28		HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
29
30	schedule_work(&syncpt->intr.work);
31}
32
33static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
34{
35	struct host1x *host = dev_id;
36	unsigned long reg;
37	unsigned int i, id;
38
39	for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
40		reg = host1x_sync_readl(host,
41			HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
42		for_each_set_bit(id, &reg, 32) {
43			struct host1x_syncpt *syncpt =
44				host->syncpt + (i * 32 + id);
45			host1x_intr_syncpt_handle(syncpt);
46		}
47	}
48
49	return IRQ_HANDLED;
50}
51
52static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
53{
54	unsigned int i;
55
56	for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
57		host1x_sync_writel(host, 0xffffffffu,
58			HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
59		host1x_sync_writel(host, 0xffffffffu,
60			HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
61	}
62}
63
64static void intr_hw_init(struct host1x *host, u32 cpm)
65{
66#if HOST1X_HW < 6
67	/* disable the ip_busy_timeout. this prevents write drops */
68	host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);
69
70	/*
71	 * increase the auto-ack timout to the maximum value. 2d will hang
72	 * otherwise on Tegra2.
73	 */
74	host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);
75
76	/* update host clocks per usec */
77	host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
78#endif
79}
80
81static int
82_host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
83			    void (*syncpt_thresh_work)(struct work_struct *))
84{
85	unsigned int i;
86	int err;
87
88	host1x_hw_intr_disable_all_syncpt_intrs(host);
89
90	for (i = 0; i < host->info->nb_pts; i++)
91		INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
92
93	err = devm_request_irq(host->dev, host->intr_syncpt_irq,
94			       syncpt_thresh_isr, IRQF_SHARED,
95			       "host1x_syncpt", host);
96	if (err < 0) {
97		WARN_ON(1);
98		return err;
99	}
100
101	intr_hw_init(host, cpm);
102
103	return 0;
104}
105
106static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
107					      unsigned int id,
108					      u32 thresh)
109{
110	host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
111}
112
113static void _host1x_intr_enable_syncpt_intr(struct host1x *host,
114					    unsigned int id)
115{
116	host1x_sync_writel(host, BIT(id % 32),
117		HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
118}
119
120static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
121					     unsigned int id)
122{
123	host1x_sync_writel(host, BIT(id % 32),
124		HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
125	host1x_sync_writel(host, BIT(id % 32),
126		HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
127}
128
129static int _host1x_free_syncpt_irq(struct host1x *host)
130{
131	unsigned int i;
132
133	devm_free_irq(host->dev, host->intr_syncpt_irq, host);
134
135	for (i = 0; i < host->info->nb_pts; i++)
136		cancel_work_sync(&host->syncpt[i].intr.work);
137
138	return 0;
139}
140
141static const struct host1x_intr_ops host1x_intr_ops = {
142	.init_host_sync = _host1x_intr_init_host_sync,
143	.set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
144	.enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
145	.disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
146	.disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
147	.free_syncpt_irq = _host1x_free_syncpt_irq,
148};
149