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59de3cf1 MK |
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 | ||
31 | #include <plat/omap_hwmod.h> | |
2b6c4e73 | 32 | #include <plat-omap/dma-omap.h> |
59de3cf1 | 33 | |
25c7d49e TL |
34 | #include "omap_device.h" |
35 | ||
f31cc962 MK |
36 | #define OMAP2_DMA_STRIDE 0x60 |
37 | ||
38 | static u32 errata; | |
39 | static u8 dma_stride; | |
40 | ||
41 | static struct omap_dma_dev_attr *d; | |
42 | ||
43 | static enum omap_reg_offsets dma_common_ch_start, dma_common_ch_end; | |
44 | ||
45 | static u16 reg_map[] = { | |
46 | [REVISION] = 0x00, | |
47 | [GCR] = 0x78, | |
48 | [IRQSTATUS_L0] = 0x08, | |
49 | [IRQSTATUS_L1] = 0x0c, | |
50 | [IRQSTATUS_L2] = 0x10, | |
51 | [IRQSTATUS_L3] = 0x14, | |
52 | [IRQENABLE_L0] = 0x18, | |
53 | [IRQENABLE_L1] = 0x1c, | |
54 | [IRQENABLE_L2] = 0x20, | |
55 | [IRQENABLE_L3] = 0x24, | |
56 | [SYSSTATUS] = 0x28, | |
57 | [OCP_SYSCONFIG] = 0x2c, | |
58 | [CAPS_0] = 0x64, | |
59 | [CAPS_2] = 0x6c, | |
60 | [CAPS_3] = 0x70, | |
61 | [CAPS_4] = 0x74, | |
62 | ||
63 | /* Common register offsets */ | |
64 | [CCR] = 0x80, | |
65 | [CLNK_CTRL] = 0x84, | |
66 | [CICR] = 0x88, | |
67 | [CSR] = 0x8c, | |
68 | [CSDP] = 0x90, | |
69 | [CEN] = 0x94, | |
70 | [CFN] = 0x98, | |
71 | [CSEI] = 0xa4, | |
72 | [CSFI] = 0xa8, | |
73 | [CDEI] = 0xac, | |
74 | [CDFI] = 0xb0, | |
75 | [CSAC] = 0xb4, | |
76 | [CDAC] = 0xb8, | |
77 | ||
78 | /* Channel specific register offsets */ | |
79 | [CSSA] = 0x9c, | |
80 | [CDSA] = 0xa0, | |
81 | [CCEN] = 0xbc, | |
82 | [CCFN] = 0xc0, | |
83 | [COLOR] = 0xc4, | |
84 | ||
85 | /* OMAP4 specific registers */ | |
86 | [CDP] = 0xd0, | |
87 | [CNDP] = 0xd4, | |
88 | [CCDN] = 0xd8, | |
89 | }; | |
90 | ||
f31cc962 MK |
91 | static void __iomem *dma_base; |
92 | static inline void dma_write(u32 val, int reg, int lch) | |
93 | { | |
94 | u8 stride; | |
95 | u32 offset; | |
96 | ||
97 | stride = (reg >= dma_common_ch_start) ? dma_stride : 0; | |
98 | offset = reg_map[reg] + (stride * lch); | |
99 | __raw_writel(val, dma_base + offset); | |
100 | } | |
101 | ||
102 | static inline u32 dma_read(int reg, int lch) | |
103 | { | |
104 | u8 stride; | |
105 | u32 offset, val; | |
106 | ||
107 | stride = (reg >= dma_common_ch_start) ? dma_stride : 0; | |
108 | offset = reg_map[reg] + (stride * lch); | |
109 | val = __raw_readl(dma_base + offset); | |
110 | return val; | |
111 | } | |
112 | ||
113 | static inline void omap2_disable_irq_lch(int lch) | |
114 | { | |
115 | u32 val; | |
116 | ||
117 | val = dma_read(IRQENABLE_L0, lch); | |
118 | val &= ~(1 << lch); | |
119 | dma_write(val, IRQENABLE_L0, lch); | |
120 | } | |
121 | ||
122 | static void omap2_clear_dma(int lch) | |
123 | { | |
124 | int i = dma_common_ch_start; | |
125 | ||
126 | for (; i <= dma_common_ch_end; i += 1) | |
127 | dma_write(0, i, lch); | |
128 | } | |
129 | ||
130 | static void omap2_show_dma_caps(void) | |
131 | { | |
132 | u8 revision = dma_read(REVISION, 0) & 0xff; | |
133 | printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n", | |
134 | revision >> 4, revision & 0xf); | |
135 | return; | |
136 | } | |
137 | ||
138 | static u32 configure_dma_errata(void) | |
139 | { | |
140 | ||
141 | /* | |
142 | * Errata applicable for OMAP2430ES1.0 and all omap2420 | |
143 | * | |
144 | * I. | |
145 | * Erratum ID: Not Available | |
146 | * Inter Frame DMA buffering issue DMA will wrongly | |
147 | * buffer elements if packing and bursting is enabled. This might | |
148 | * result in data gets stalled in FIFO at the end of the block. | |
149 | * Workaround: DMA channels must have BUFFERING_DISABLED bit set to | |
150 | * guarantee no data will stay in the DMA FIFO in case inter frame | |
151 | * buffering occurs | |
152 | * | |
153 | * II. | |
154 | * Erratum ID: Not Available | |
155 | * DMA may hang when several channels are used in parallel | |
156 | * In the following configuration, DMA channel hanging can occur: | |
157 | * a. Channel i, hardware synchronized, is enabled | |
158 | * b. Another channel (Channel x), software synchronized, is enabled. | |
159 | * c. Channel i is disabled before end of transfer | |
160 | * d. Channel i is reenabled. | |
161 | * e. Steps 1 to 4 are repeated a certain number of times. | |
162 | * f. A third channel (Channel y), software synchronized, is enabled. | |
163 | * Channel x and Channel y may hang immediately after step 'f'. | |
164 | * Workaround: | |
165 | * For any channel used - make sure NextLCH_ID is set to the value j. | |
166 | */ | |
167 | if (cpu_is_omap2420() || (cpu_is_omap2430() && | |
168 | (omap_type() == OMAP2430_REV_ES1_0))) { | |
169 | ||
170 | SET_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING); | |
171 | SET_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS); | |
172 | } | |
173 | ||
174 | /* | |
175 | * Erratum ID: i378: OMAP2+: sDMA Channel is not disabled | |
176 | * after a transaction error. | |
177 | * Workaround: SW should explicitely disable the channel. | |
178 | */ | |
179 | if (cpu_class_is_omap2()) | |
180 | SET_DMA_ERRATA(DMA_ERRATA_i378); | |
181 | ||
182 | /* | |
183 | * Erratum ID: i541: sDMA FIFO draining does not finish | |
184 | * If sDMA channel is disabled on the fly, sDMA enters standby even | |
185 | * through FIFO Drain is still in progress | |
186 | * Workaround: Put sDMA in NoStandby more before a logical channel is | |
187 | * disabled, then put it back to SmartStandby right after the channel | |
188 | * finishes FIFO draining. | |
189 | */ | |
190 | if (cpu_is_omap34xx()) | |
191 | SET_DMA_ERRATA(DMA_ERRATA_i541); | |
192 | ||
193 | /* | |
194 | * Erratum ID: i88 : Special programming model needed to disable DMA | |
195 | * before end of block. | |
196 | * Workaround: software must ensure that the DMA is configured in No | |
197 | * Standby mode(DMAx_OCP_SYSCONFIG.MIDLEMODE = "01") | |
198 | */ | |
199 | if (omap_type() == OMAP3430_REV_ES1_0) | |
200 | SET_DMA_ERRATA(DMA_ERRATA_i88); | |
201 | ||
202 | /* | |
203 | * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is | |
204 | * read before the DMA controller finished disabling the channel. | |
205 | */ | |
206 | SET_DMA_ERRATA(DMA_ERRATA_3_3); | |
207 | ||
208 | /* | |
209 | * Erratum ID: Not Available | |
210 | * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared | |
211 | * after secure sram context save and restore. | |
212 | * Work around: Hence we need to manually clear those IRQs to avoid | |
213 | * spurious interrupts. This affects only secure devices. | |
214 | */ | |
215 | if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) | |
216 | SET_DMA_ERRATA(DMA_ROMCODE_BUG); | |
217 | ||
218 | return errata; | |
219 | } | |
220 | ||
59de3cf1 MK |
221 | /* One time initializations */ |
222 | static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *unused) | |
223 | { | |
3528c58e | 224 | struct platform_device *pdev; |
59de3cf1 | 225 | struct omap_system_dma_plat_info *p; |
f31cc962 | 226 | struct resource *mem; |
59de3cf1 MK |
227 | char *name = "omap_dma_system"; |
228 | ||
f31cc962 MK |
229 | dma_stride = OMAP2_DMA_STRIDE; |
230 | dma_common_ch_start = CSDP; | |
f31cc962 | 231 | |
59de3cf1 MK |
232 | p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL); |
233 | if (!p) { | |
234 | pr_err("%s: Unable to allocate pdata for %s:%s\n", | |
235 | __func__, name, oh->name); | |
236 | return -ENOMEM; | |
237 | } | |
238 | ||
f31cc962 MK |
239 | p->dma_attr = (struct omap_dma_dev_attr *)oh->dev_attr; |
240 | p->disable_irq_lch = omap2_disable_irq_lch; | |
241 | p->show_dma_caps = omap2_show_dma_caps; | |
242 | p->clear_dma = omap2_clear_dma; | |
243 | p->dma_write = dma_write; | |
244 | p->dma_read = dma_read; | |
245 | ||
246 | p->clear_lch_regs = NULL; | |
247 | ||
248 | p->errata = configure_dma_errata(); | |
249 | ||
f718e2c0 | 250 | pdev = omap_device_build(name, 0, oh, p, sizeof(*p), NULL, 0, 0); |
59de3cf1 | 251 | kfree(p); |
3528c58e | 252 | if (IS_ERR(pdev)) { |
25985edc | 253 | pr_err("%s: Can't build omap_device for %s:%s.\n", |
59de3cf1 | 254 | __func__, name, oh->name); |
3528c58e | 255 | return PTR_ERR(pdev); |
59de3cf1 MK |
256 | } |
257 | ||
3528c58e | 258 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
f31cc962 | 259 | if (!mem) { |
3528c58e | 260 | dev_err(&pdev->dev, "%s: no mem resource\n", __func__); |
f31cc962 MK |
261 | return -EINVAL; |
262 | } | |
263 | dma_base = ioremap(mem->start, resource_size(mem)); | |
264 | if (!dma_base) { | |
3528c58e | 265 | dev_err(&pdev->dev, "%s: ioremap fail\n", __func__); |
f31cc962 MK |
266 | return -ENOMEM; |
267 | } | |
268 | ||
269 | d = oh->dev_attr; | |
270 | d->chan = kzalloc(sizeof(struct omap_dma_lch) * | |
271 | (d->lch_count), GFP_KERNEL); | |
272 | ||
273 | if (!d->chan) { | |
3528c58e | 274 | dev_err(&pdev->dev, "%s: kzalloc fail\n", __func__); |
f31cc962 MK |
275 | return -ENOMEM; |
276 | } | |
f6d5e079 S |
277 | |
278 | /* Check the capabilities register for descriptor loading feature */ | |
279 | if (dma_read(CAPS_0, 0) & DMA_HAS_DESCRIPTOR_CAPS) | |
280 | dma_common_ch_end = CCDN; | |
281 | else | |
282 | dma_common_ch_end = CCFN; | |
283 | ||
59de3cf1 MK |
284 | return 0; |
285 | } | |
286 | ||
287 | static int __init omap2_system_dma_init(void) | |
288 | { | |
289 | return omap_hwmod_for_each_by_class("dma", | |
290 | omap2_system_dma_init_dev, NULL); | |
291 | } | |
292 | arch_initcall(omap2_system_dma_init); |