summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/dma.c
blob: dfc9b21ff19bdcabd6528abdf84f1745a5ae3256 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
// SPDX-License-Identifier: GPL-2.0-only
/*
 * OMAP2+ DMA driver
 *
 * Copyright (C) 2003 - 2008 Nokia Corporation
 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
 * Graphics DMA and LCD DMA graphics tranformations
 * by Imre Deak <imre.deak@nokia.com>
 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
 *
 * Copyright (C) 2009 Texas Instruments
 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/
 * Converted DMA library into platform driver
 *	- G, Manjunath Kondaiah <manjugk@ti.com>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/of.h>
#include <linux/omap-dma.h>

#include "soc.h"

static const struct omap_dma_reg reg_map[] = {
	[REVISION]	= { 0x0000, 0x00, OMAP_DMA_REG_32BIT },
	[GCR]		= { 0x0078, 0x00, OMAP_DMA_REG_32BIT },
	[IRQSTATUS_L0]	= { 0x0008, 0x00, OMAP_DMA_REG_32BIT },
	[IRQSTATUS_L1]	= { 0x000c, 0x00, OMAP_DMA_REG_32BIT },
	[IRQSTATUS_L2]	= { 0x0010, 0x00, OMAP_DMA_REG_32BIT },
	[IRQSTATUS_L3]	= { 0x0014, 0x00, OMAP_DMA_REG_32BIT },
	[IRQENABLE_L0]	= { 0x0018, 0x00, OMAP_DMA_REG_32BIT },
	[IRQENABLE_L1]	= { 0x001c, 0x00, OMAP_DMA_REG_32BIT },
	[IRQENABLE_L2]	= { 0x0020, 0x00, OMAP_DMA_REG_32BIT },
	[IRQENABLE_L3]	= { 0x0024, 0x00, OMAP_DMA_REG_32BIT },
	[SYSSTATUS]	= { 0x0028, 0x00, OMAP_DMA_REG_32BIT },
	[OCP_SYSCONFIG]	= { 0x002c, 0x00, OMAP_DMA_REG_32BIT },
	[CAPS_0]	= { 0x0064, 0x00, OMAP_DMA_REG_32BIT },
	[CAPS_2]	= { 0x006c, 0x00, OMAP_DMA_REG_32BIT },
	[CAPS_3]	= { 0x0070, 0x00, OMAP_DMA_REG_32BIT },
	[CAPS_4]	= { 0x0074, 0x00, OMAP_DMA_REG_32BIT },

	/* Common register offsets */
	[CCR]		= { 0x0080, 0x60, OMAP_DMA_REG_32BIT },
	[CLNK_CTRL]	= { 0x0084, 0x60, OMAP_DMA_REG_32BIT },
	[CICR]		= { 0x0088, 0x60, OMAP_DMA_REG_32BIT },
	[CSR]		= { 0x008c, 0x60, OMAP_DMA_REG_32BIT },
	[CSDP]		= { 0x0090, 0x60, OMAP_DMA_REG_32BIT },
	[CEN]		= { 0x0094, 0x60, OMAP_DMA_REG_32BIT },
	[CFN]		= { 0x0098, 0x60, OMAP_DMA_REG_32BIT },
	[CSEI]		= { 0x00a4, 0x60, OMAP_DMA_REG_32BIT },
	[CSFI]		= { 0x00a8, 0x60, OMAP_DMA_REG_32BIT },
	[CDEI]		= { 0x00ac, 0x60, OMAP_DMA_REG_32BIT },
	[CDFI]		= { 0x00b0, 0x60, OMAP_DMA_REG_32BIT },
	[CSAC]		= { 0x00b4, 0x60, OMAP_DMA_REG_32BIT },
	[CDAC]		= { 0x00b8, 0x60, OMAP_DMA_REG_32BIT },

	/* Channel specific register offsets */
	[CSSA]		= { 0x009c, 0x60, OMAP_DMA_REG_32BIT },
	[CDSA]		= { 0x00a0, 0x60, OMAP_DMA_REG_32BIT },
	[CCEN]		= { 0x00bc, 0x60, OMAP_DMA_REG_32BIT },
	[CCFN]		= { 0x00c0, 0x60, OMAP_DMA_REG_32BIT },
	[COLOR]		= { 0x00c4, 0x60, OMAP_DMA_REG_32BIT },

	/* OMAP4 specific registers */
	[CDP]		= { 0x00d0, 0x60, OMAP_DMA_REG_32BIT },
	[CNDP]		= { 0x00d4, 0x60, OMAP_DMA_REG_32BIT },
	[CCDN]		= { 0x00d8, 0x60, OMAP_DMA_REG_32BIT },
};

static unsigned configure_dma_errata(void)
{
	unsigned errata = 0;

	/*
	 * Errata applicable for OMAP2430ES1.0 and all omap2420
	 *
	 * I.
	 * Erratum ID: Not Available
	 * Inter Frame DMA buffering issue DMA will wrongly
	 * buffer elements if packing and bursting is enabled. This might
	 * result in data gets stalled in FIFO at the end of the block.
	 * Workaround: DMA channels must have BUFFERING_DISABLED bit set to
	 * guarantee no data will stay in the DMA FIFO in case inter frame
	 * buffering occurs
	 *
	 * II.
	 * Erratum ID: Not Available
	 * DMA may hang when several channels are used in parallel
	 * In the following configuration, DMA channel hanging can occur:
	 * a. Channel i, hardware synchronized, is enabled
	 * b. Another channel (Channel x), software synchronized, is enabled.
	 * c. Channel i is disabled before end of transfer
	 * d. Channel i is reenabled.
	 * e. Steps 1 to 4 are repeated a certain number of times.
	 * f. A third channel (Channel y), software synchronized, is enabled.
	 * Channel x and Channel y may hang immediately after step 'f'.
	 * Workaround:
	 * For any channel used - make sure NextLCH_ID is set to the value j.
	 */
	if (cpu_is_omap2420() || (cpu_is_omap2430() &&
				(omap_type() == OMAP2430_REV_ES1_0))) {

		SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
		SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
	}

	/*
	 * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
	 * after a transaction error.
	 * Workaround: SW should explicitely disable the channel.
	 */
	if (cpu_class_is_omap2())
		SET_DMA_ERRATA(DMA_ERRATA_i378);

	/*
	 * Erratum ID: i541: sDMA FIFO draining does not finish
	 * If sDMA channel is disabled on the fly, sDMA enters standby even
	 * through FIFO Drain is still in progress
	 * Workaround: Put sDMA in NoStandby more before a logical channel is
	 * disabled, then put it back to SmartStandby right after the channel
	 * finishes FIFO draining.
	 */
	if (cpu_is_omap34xx())
		SET_DMA_ERRATA(DMA_ERRATA_i541);

	/*
	 * Erratum ID: i88 : Special programming model needed to disable DMA
	 * before end of block.
	 * Workaround: software must ensure that the DMA is configured in No
	 * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
	 */
	if (omap_type() == OMAP3430_REV_ES1_0)
		SET_DMA_ERRATA(DMA_ERRATA_i88);

	/*
	 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
	 * read before the DMA controller finished disabling the channel.
	 */
	SET_DMA_ERRATA(DMA_ERRATA_3_3);

	/*
	 * Erratum ID: Not Available
	 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
	 * after secure sram context save and restore.
	 * Work around: Hence we need to manually clear those IRQs to avoid
	 * spurious interrupts. This affects only secure devices.
	 */
	if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
		SET_DMA_ERRATA(DMA_ROMCODE_BUG);

	return errata;
}

static const struct dma_slave_map omap24xx_sdma_dt_map[] = {
	/* external DMA requests when tusb6010 is used */
	{ "musb-hdrc.1.auto", "dmareq0", SDMA_FILTER_PARAM(2) },
	{ "musb-hdrc.1.auto", "dmareq1", SDMA_FILTER_PARAM(3) },
	{ "musb-hdrc.1.auto", "dmareq2", SDMA_FILTER_PARAM(14) }, /* OMAP2420 only */
	{ "musb-hdrc.1.auto", "dmareq3", SDMA_FILTER_PARAM(15) }, /* OMAP2420 only */
	{ "musb-hdrc.1.auto", "dmareq4", SDMA_FILTER_PARAM(16) }, /* OMAP2420 only */
	{ "musb-hdrc.1.auto", "dmareq5", SDMA_FILTER_PARAM(64) }, /* OMAP2420 only */
};

static struct omap_dma_dev_attr dma_attr = {
	.dev_caps = RESERVE_CHANNEL | DMA_LINKED_LCH | GLOBAL_PRIORITY |
		    IS_CSSA_32 | IS_CDSA_32,
	.lch_count = 32,
};

struct omap_system_dma_plat_info dma_plat_info = {
	.reg_map	= reg_map,
	.channel_stride	= 0x60,
	.dma_attr	= &dma_attr,
};

/* One time initializations */
static int __init omap2_system_dma_init(void)
{
	dma_plat_info.errata = configure_dma_errata();

	if (soc_is_omap24xx()) {
		/* DMA slave map for drivers not yet converted to DT */
		dma_plat_info.slave_map = omap24xx_sdma_dt_map;
		dma_plat_info.slavecnt = ARRAY_SIZE(omap24xx_sdma_dt_map);
	}

	if (!soc_is_omap242x())
		dma_attr.dev_caps |= IS_RW_PRIORITY;

	if (soc_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
		dma_attr.dev_caps |= HS_CHANNELS_RESERVED;

	return 0;
}
omap_arch_initcall(omap2_system_dma_init);