1 /*
2 * OMAP2+ DMA driver
3 *
4 * Copyright (C) 2003 - 2008 Nokia Corporation
5 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
6 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
7 * Graphics DMA and LCD DMA graphics tranformations
8 * by Imre Deak <imre.deak@nokia.com>
9 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
10 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
11 *
12 * Copyright (C) 2009 Texas Instruments
13 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
14 *
15 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
16 * Converted DMA library into platform driver
17 * - G, Manjunath Kondaiah <manjugk@ti.com>
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License version 2 as
21 * published by the Free Software Foundation.
22 */
23
24 #include <linux/err.h>
25 #include <linux/io.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/device.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/dmaengine.h>
32 #include <linux/of.h>
33 #include <linux/omap-dma.h>
34
35 #include "soc.h"
36 #include "omap_hwmod.h"
37 #include "omap_device.h"
38
39 static enum omap_reg_offsets dma_common_ch_end;
40
41 static const struct omap_dma_reg reg_map[] = {
42 [REVISION] = { 0x0000, 0x00, OMAP_DMA_REG_32BIT },
43 [GCR] = { 0x0078, 0x00, OMAP_DMA_REG_32BIT },
44 [IRQSTATUS_L0] = { 0x0008, 0x00, OMAP_DMA_REG_32BIT },
45 [IRQSTATUS_L1] = { 0x000c, 0x00, OMAP_DMA_REG_32BIT },
46 [IRQSTATUS_L2] = { 0x0010, 0x00, OMAP_DMA_REG_32BIT },
47 [IRQSTATUS_L3] = { 0x0014, 0x00, OMAP_DMA_REG_32BIT },
48 [IRQENABLE_L0] = { 0x0018, 0x00, OMAP_DMA_REG_32BIT },
49 [IRQENABLE_L1] = { 0x001c, 0x00, OMAP_DMA_REG_32BIT },
50 [IRQENABLE_L2] = { 0x0020, 0x00, OMAP_DMA_REG_32BIT },
51 [IRQENABLE_L3] = { 0x0024, 0x00, OMAP_DMA_REG_32BIT },
52 [SYSSTATUS] = { 0x0028, 0x00, OMAP_DMA_REG_32BIT },
53 [OCP_SYSCONFIG] = { 0x002c, 0x00, OMAP_DMA_REG_32BIT },
54 [CAPS_0] = { 0x0064, 0x00, OMAP_DMA_REG_32BIT },
55 [CAPS_2] = { 0x006c, 0x00, OMAP_DMA_REG_32BIT },
56 [CAPS_3] = { 0x0070, 0x00, OMAP_DMA_REG_32BIT },
57 [CAPS_4] = { 0x0074, 0x00, OMAP_DMA_REG_32BIT },
58
59 /* Common register offsets */
60 [CCR] = { 0x0080, 0x60, OMAP_DMA_REG_32BIT },
61 [CLNK_CTRL] = { 0x0084, 0x60, OMAP_DMA_REG_32BIT },
62 [CICR] = { 0x0088, 0x60, OMAP_DMA_REG_32BIT },
63 [CSR] = { 0x008c, 0x60, OMAP_DMA_REG_32BIT },
64 [CSDP] = { 0x0090, 0x60, OMAP_DMA_REG_32BIT },
65 [CEN] = { 0x0094, 0x60, OMAP_DMA_REG_32BIT },
66 [CFN] = { 0x0098, 0x60, OMAP_DMA_REG_32BIT },
67 [CSEI] = { 0x00a4, 0x60, OMAP_DMA_REG_32BIT },
68 [CSFI] = { 0x00a8, 0x60, OMAP_DMA_REG_32BIT },
69 [CDEI] = { 0x00ac, 0x60, OMAP_DMA_REG_32BIT },
70 [CDFI] = { 0x00b0, 0x60, OMAP_DMA_REG_32BIT },
71 [CSAC] = { 0x00b4, 0x60, OMAP_DMA_REG_32BIT },
72 [CDAC] = { 0x00b8, 0x60, OMAP_DMA_REG_32BIT },
73
74 /* Channel specific register offsets */
75 [CSSA] = { 0x009c, 0x60, OMAP_DMA_REG_32BIT },
76 [CDSA] = { 0x00a0, 0x60, OMAP_DMA_REG_32BIT },
77 [CCEN] = { 0x00bc, 0x60, OMAP_DMA_REG_32BIT },
78 [CCFN] = { 0x00c0, 0x60, OMAP_DMA_REG_32BIT },
79 [COLOR] = { 0x00c4, 0x60, OMAP_DMA_REG_32BIT },
80
81 /* OMAP4 specific registers */
82 [CDP] = { 0x00d0, 0x60, OMAP_DMA_REG_32BIT },
83 [CNDP] = { 0x00d4, 0x60, OMAP_DMA_REG_32BIT },
84 [CCDN] = { 0x00d8, 0x60, OMAP_DMA_REG_32BIT },
85 };
86
87 static void __iomem *dma_base;
dma_write(u32 val,int reg,int lch)88 static inline void dma_write(u32 val, int reg, int lch)
89 {
90 void __iomem *addr = dma_base;
91
92 addr += reg_map[reg].offset;
93 addr += reg_map[reg].stride * lch;
94
95 writel_relaxed(val, addr);
96 }
97
dma_read(int reg,int lch)98 static inline u32 dma_read(int reg, int lch)
99 {
100 void __iomem *addr = dma_base;
101
102 addr += reg_map[reg].offset;
103 addr += reg_map[reg].stride * lch;
104
105 return readl_relaxed(addr);
106 }
107
omap2_clear_dma(int lch)108 static void omap2_clear_dma(int lch)
109 {
110 int i;
111
112 for (i = CSDP; i <= dma_common_ch_end; i += 1)
113 dma_write(0, i, lch);
114 }
115
omap2_show_dma_caps(void)116 static void omap2_show_dma_caps(void)
117 {
118 u8 revision = dma_read(REVISION, 0) & 0xff;
119 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
120 revision >> 4, revision & 0xf);
121 }
122
configure_dma_errata(void)123 static unsigned configure_dma_errata(void)
124 {
125 unsigned errata = 0;
126
127 /*
128 * Errata applicable for OMAP2430ES1.0 and all omap2420
129 *
130 * I.
131 * Erratum ID: Not Available
132 * Inter Frame DMA buffering issue DMA will wrongly
133 * buffer elements if packing and bursting is enabled. This might
134 * result in data gets stalled in FIFO at the end of the block.
135 * Workaround: DMA channels must have BUFFERING_DISABLED bit set to
136 * guarantee no data will stay in the DMA FIFO in case inter frame
137 * buffering occurs
138 *
139 * II.
140 * Erratum ID: Not Available
141 * DMA may hang when several channels are used in parallel
142 * In the following configuration, DMA channel hanging can occur:
143 * a. Channel i, hardware synchronized, is enabled
144 * b. Another channel (Channel x), software synchronized, is enabled.
145 * c. Channel i is disabled before end of transfer
146 * d. Channel i is reenabled.
147 * e. Steps 1 to 4 are repeated a certain number of times.
148 * f. A third channel (Channel y), software synchronized, is enabled.
149 * Channel x and Channel y may hang immediately after step 'f'.
150 * Workaround:
151 * For any channel used - make sure NextLCH_ID is set to the value j.
152 */
153 if (cpu_is_omap2420() || (cpu_is_omap2430() &&
154 (omap_type() == OMAP2430_REV_ES1_0))) {
155
156 SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING);
157 SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS);
158 }
159
160 /*
161 * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled
162 * after a transaction error.
163 * Workaround: SW should explicitely disable the channel.
164 */
165 if (cpu_class_is_omap2())
166 SET_DMA_ERRATA(DMA_ERRATA_i378);
167
168 /*
169 * Erratum ID: i541: sDMA FIFO draining does not finish
170 * If sDMA channel is disabled on the fly, sDMA enters standby even
171 * through FIFO Drain is still in progress
172 * Workaround: Put sDMA in NoStandby more before a logical channel is
173 * disabled, then put it back to SmartStandby right after the channel
174 * finishes FIFO draining.
175 */
176 if (cpu_is_omap34xx())
177 SET_DMA_ERRATA(DMA_ERRATA_i541);
178
179 /*
180 * Erratum ID: i88 : Special programming model needed to disable DMA
181 * before end of block.
182 * Workaround: software must ensure that the DMA is configured in No
183 * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01")
184 */
185 if (omap_type() == OMAP3430_REV_ES1_0)
186 SET_DMA_ERRATA(DMA_ERRATA_i88);
187
188 /*
189 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
190 * read before the DMA controller finished disabling the channel.
191 */
192 SET_DMA_ERRATA(DMA_ERRATA_3_3);
193
194 /*
195 * Erratum ID: Not Available
196 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
197 * after secure sram context save and restore.
198 * Work around: Hence we need to manually clear those IRQs to avoid
199 * spurious interrupts. This affects only secure devices.
200 */
201 if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
202 SET_DMA_ERRATA(DMA_ROMCODE_BUG);
203
204 return errata;
205 }
206
207 static const struct dma_slave_map omap24xx_sdma_dt_map[] = {
208 /* external DMA requests when tusb6010 is used */
209 { "musb-hdrc.1.auto", "dmareq0", SDMA_FILTER_PARAM(2) },
210 { "musb-hdrc.1.auto", "dmareq1", SDMA_FILTER_PARAM(3) },
211 { "musb-hdrc.1.auto", "dmareq2", SDMA_FILTER_PARAM(14) }, /* OMAP2420 only */
212 { "musb-hdrc.1.auto", "dmareq3", SDMA_FILTER_PARAM(15) }, /* OMAP2420 only */
213 { "musb-hdrc.1.auto", "dmareq4", SDMA_FILTER_PARAM(16) }, /* OMAP2420 only */
214 { "musb-hdrc.1.auto", "dmareq5", SDMA_FILTER_PARAM(64) }, /* OMAP2420 only */
215 };
216
217 static struct omap_system_dma_plat_info dma_plat_info __initdata = {
218 .reg_map = reg_map,
219 .channel_stride = 0x60,
220 .show_dma_caps = omap2_show_dma_caps,
221 .clear_dma = omap2_clear_dma,
222 .dma_write = dma_write,
223 .dma_read = dma_read,
224 };
225
226 static struct platform_device_info omap_dma_dev_info __initdata = {
227 .name = "omap-dma-engine",
228 .id = -1,
229 .dma_mask = DMA_BIT_MASK(32),
230 };
231
232 /* One time initializations */
omap2_system_dma_init_dev(struct omap_hwmod * oh,void * unused)233 static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *unused)
234 {
235 struct platform_device *pdev;
236 struct omap_system_dma_plat_info p;
237 struct omap_dma_dev_attr *d;
238 struct resource *mem;
239 char *name = "omap_dma_system";
240
241 p = dma_plat_info;
242 p.dma_attr = (struct omap_dma_dev_attr *)oh->dev_attr;
243 p.errata = configure_dma_errata();
244
245 if (soc_is_omap24xx()) {
246 /* DMA slave map for drivers not yet converted to DT */
247 p.slave_map = omap24xx_sdma_dt_map;
248 p.slavecnt = ARRAY_SIZE(omap24xx_sdma_dt_map);
249 }
250
251 pdev = omap_device_build(name, 0, oh, &p, sizeof(p));
252 if (IS_ERR(pdev)) {
253 pr_err("%s: Can't build omap_device for %s:%s.\n",
254 __func__, name, oh->name);
255 return PTR_ERR(pdev);
256 }
257
258 omap_dma_dev_info.res = pdev->resource;
259 omap_dma_dev_info.num_res = pdev->num_resources;
260
261 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
262 if (!mem) {
263 dev_err(&pdev->dev, "%s: no mem resource\n", __func__);
264 return -EINVAL;
265 }
266
267 dma_base = ioremap(mem->start, resource_size(mem));
268 if (!dma_base) {
269 dev_err(&pdev->dev, "%s: ioremap fail\n", __func__);
270 return -ENOMEM;
271 }
272
273 d = oh->dev_attr;
274
275 if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
276 d->dev_caps |= HS_CHANNELS_RESERVED;
277
278 if (platform_get_irq_byname(pdev, "0") < 0)
279 d->dev_caps |= DMA_ENGINE_HANDLE_IRQ;
280
281 /* Check the capabilities register for descriptor loading feature */
282 if (dma_read(CAPS_0, 0) & DMA_HAS_DESCRIPTOR_CAPS)
283 dma_common_ch_end = CCDN;
284 else
285 dma_common_ch_end = CCFN;
286
287 return 0;
288 }
289
omap2_system_dma_init(void)290 static int __init omap2_system_dma_init(void)
291 {
292 return omap_hwmod_for_each_by_class("dma",
293 omap2_system_dma_init_dev, NULL);
294 }
295 omap_arch_initcall(omap2_system_dma_init);
296
