1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * OMAP2+ DMA driver
4 *
5 * Copyright (C) 2003 - 2008 Nokia Corporation
6 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
7 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
8 * Graphics DMA and LCD DMA graphics tranformations
9 * by Imre Deak <imre.deak@nokia.com>
10 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
11 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
12 *
13 * Copyright (C) 2009 Texas Instruments
14 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
15 *
16 * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/
17 * Converted DMA library into platform driver
18 * - G, Manjunath Kondaiah <manjugk@ti.com>
19 */
20
21 #include <linux/err.h>
22 #include <linux/io.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/device.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/dmaengine.h>
29 #include <linux/of.h>
30 #include <linux/omap-dma.h>
31
32 #include "soc.h"
33 #include "common.h"
34
35 static const struct omap_dma_reg reg_map[] = {
36 [REVISION] = { 0x0000, 0x00, OMAP_DMA_REG_32BIT },
37 [GCR] = { 0x0078, 0x00, OMAP_DMA_REG_32BIT },
38 [IRQSTATUS_L0] = { 0x0008, 0x00, OMAP_DMA_REG_32BIT },
39 [IRQSTATUS_L1] = { 0x000c, 0x00, OMAP_DMA_REG_32BIT },
40 [IRQSTATUS_L2] = { 0x0010, 0x00, OMAP_DMA_REG_32BIT },
41 [IRQSTATUS_L3] = { 0x0014, 0x00, OMAP_DMA_REG_32BIT },
42 [IRQENABLE_L0] = { 0x0018, 0x00, OMAP_DMA_REG_32BIT },
43 [IRQENABLE_L1] = { 0x001c, 0x00, OMAP_DMA_REG_32BIT },
44 [IRQENABLE_L2] = { 0x0020, 0x00, OMAP_DMA_REG_32BIT },
45 [IRQENABLE_L3] = { 0x0024, 0x00, OMAP_DMA_REG_32BIT },
46 [SYSSTATUS] = { 0x0028, 0x00, OMAP_DMA_REG_32BIT },
47 [OCP_SYSCONFIG] = { 0x002c, 0x00, OMAP_DMA_REG_32BIT },
48 [CAPS_0] = { 0x0064, 0x00, OMAP_DMA_REG_32BIT },
49 [CAPS_2] = { 0x006c, 0x00, OMAP_DMA_REG_32BIT },
50 [CAPS_3] = { 0x0070, 0x00, OMAP_DMA_REG_32BIT },
51 [CAPS_4] = { 0x0074, 0x00, OMAP_DMA_REG_32BIT },
52
53 /* Common register offsets */
54 [CCR] = { 0x0080, 0x60, OMAP_DMA_REG_32BIT },
55 [CLNK_CTRL] = { 0x0084, 0x60, OMAP_DMA_REG_32BIT },
56 [CICR] = { 0x0088, 0x60, OMAP_DMA_REG_32BIT },
57 [CSR] = { 0x008c, 0x60, OMAP_DMA_REG_32BIT },
58 [CSDP] = { 0x0090, 0x60, OMAP_DMA_REG_32BIT },
59 [CEN] = { 0x0094, 0x60, OMAP_DMA_REG_32BIT },
60 [CFN] = { 0x0098, 0x60, OMAP_DMA_REG_32BIT },
61 [CSEI] = { 0x00a4, 0x60, OMAP_DMA_REG_32BIT },
62 [CSFI] = { 0x00a8, 0x60, OMAP_DMA_REG_32BIT },
63 [CDEI] = { 0x00ac, 0x60, OMAP_DMA_REG_32BIT },
64 [CDFI] = { 0x00b0, 0x60, OMAP_DMA_REG_32BIT },
65 [CSAC] = { 0x00b4, 0x60, OMAP_DMA_REG_32BIT },
66 [CDAC] = { 0x00b8, 0x60, OMAP_DMA_REG_32BIT },
67
68 /* Channel specific register offsets */
69 [CSSA] = { 0x009c, 0x60, OMAP_DMA_REG_32BIT },
70 [CDSA] = { 0x00a0, 0x60, OMAP_DMA_REG_32BIT },
71 [CCEN] = { 0x00bc, 0x60, OMAP_DMA_REG_32BIT },
72 [CCFN] = { 0x00c0, 0x60, OMAP_DMA_REG_32BIT },
73 [COLOR] = { 0x00c4, 0x60, OMAP_DMA_REG_32BIT },
74
75 /* OMAP4 specific registers */
76 [CDP] = { 0x00d0, 0x60, OMAP_DMA_REG_32BIT },
77 [CNDP] = { 0x00d4, 0x60, OMAP_DMA_REG_32BIT },
78 [CCDN] = { 0x00d8, 0x60, OMAP_DMA_REG_32BIT },
79 };
80
81 static unsigned configure_dma_errata(void)
82 {
83 unsigned errata = 0;
84
85 /*
86 * Errata applicable for OMAP2430ES1.0 and all omap2420
87 *
88 * I.
89 * Erratum ID: Not Available
90 * Inter Frame DMA buffering issue DMA will wrongly
91 * buffer elements if packing and bursting is enabled. This might
92 * result in data gets stalled in FIFO at the end of the block.
93 * Workaround: DMA channels must have BUFFERING_DISABLED bit set to
94 * guarantee no data will stay in the DMA FIFO in case inter frame
95 * buffering occurs
96 *
97 * II.
98 * Erratum ID: Not Available
99 * DMA may hang when several channels are used in parallel
100 * In the following configuration, DMA channel hanging can occur:
101 * a. Channel i, hardware synchronized, is enabled
102 * b. Another channel (Channel x), software synchronized, is enabled.
103 * c. Channel i is disabled before end of transfer
104 * d. Channel i is reenabled.
105 * e. Steps 1 to 4 are repeated a certain number of times.
106 * f. A third channel (Channel y), software synchronized, is enabled.
107 * Channel x and Channel y may hang immediately after step 'f'.
108 * Workaround:
109 * For any channel used - make sure NextLCH_ID is set to the value j.
110 */
111 if (cpu_is_omap2420() || (cpu_is_omap2430() &&
112 (omap_type() == OMAP2430_REV_ES1_0))) {
113
114 SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
115 SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
116 }
117
118 /*
119 * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
120 * after a transaction error.
121 * Workaround: SW should explicitely disable the channel.
122 */
123 if (cpu_class_is_omap2())
124 SET_DMA_ERRATA(DMA_ERRATA_i378);
125
126 /*
127 * Erratum ID: i541: sDMA FIFO draining does not finish
128 * If sDMA channel is disabled on the fly, sDMA enters standby even
129 * through FIFO Drain is still in progress
130 * Workaround: Put sDMA in NoStandby more before a logical channel is
131 * disabled, then put it back to SmartStandby right after the channel
132 * finishes FIFO draining.
133 */
134 if (cpu_is_omap34xx())
135 SET_DMA_ERRATA(DMA_ERRATA_i541);
136
137 /*
138 * Erratum ID: i88 : Special programming model needed to disable DMA
139 * before end of block.
140 * Workaround: software must ensure that the DMA is configured in No
141 * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
142 */
143 if (omap_type() == OMAP3430_REV_ES1_0)
144 SET_DMA_ERRATA(DMA_ERRATA_i88);
145
146 /*
147 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
148 * read before the DMA controller finished disabling the channel.
149 */
150 SET_DMA_ERRATA(DMA_ERRATA_3_3);
151
152 /*
153 * Erratum ID: Not Available
154 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
155 * after secure sram context save and restore.
156 * Work around: Hence we need to manually clear those IRQs to avoid
157 * spurious interrupts. This affects only secure devices.
158 */
159 if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
160 SET_DMA_ERRATA(DMA_ROMCODE_BUG);
161
162 return errata;
163 }
164
165 static const struct dma_slave_map omap24xx_sdma_dt_map[] = {
166 /* external DMA requests when tusb6010 is used */
167 { "musb-hdrc.1.auto", "dmareq0", SDMA_FILTER_PARAM(2) },
168 { "musb-hdrc.1.auto", "dmareq1", SDMA_FILTER_PARAM(3) },
169 { "musb-hdrc.1.auto", "dmareq2", SDMA_FILTER_PARAM(14) }, /* OMAP2420 only */
170 { "musb-hdrc.1.auto", "dmareq3", SDMA_FILTER_PARAM(15) }, /* OMAP2420 only */
171 { "musb-hdrc.1.auto", "dmareq4", SDMA_FILTER_PARAM(16) }, /* OMAP2420 only */
172 { "musb-hdrc.1.auto", "dmareq5", SDMA_FILTER_PARAM(64) }, /* OMAP2420 only */
173 };
174
175 static struct omap_dma_dev_attr dma_attr = {
176 .dev_caps = RESERVE_CHANNEL | DMA_LINKED_LCH | GLOBAL_PRIORITY |
177 IS_CSSA_32 | IS_CDSA_32,
178 .lch_count = 32,
179 };
180
181 struct omap_system_dma_plat_info dma_plat_info = {
182 .reg_map = reg_map,
183 .channel_stride = 0x60,
184 .dma_attr = &dma_attr,
185 };
186
187 /* One time initializations */
188 static int __init omap2_system_dma_init(void)
189 {
190 dma_plat_info.errata = configure_dma_errata();
191
192 if (soc_is_omap24xx()) {
193 /* DMA slave map for drivers not yet converted to DT */
194 dma_plat_info.slave_map = omap24xx_sdma_dt_map;
195 dma_plat_info.slavecnt = ARRAY_SIZE(omap24xx_sdma_dt_map);
196 }
197
198 if (!soc_is_omap242x())
199 dma_attr.dev_caps |= IS_RW_PRIORITY;
200
201 if (soc_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
202 dma_attr.dev_caps |= HS_CHANNELS_RESERVED;
203
204 return 0;
205 }
206 omap_arch_initcall(omap2_system_dma_init);
207
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.