1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * arch/arm/mach-ep93xx/dma.c
4 *
5 * Platform support code for the EP93xx dmaengine driver.
6 *
7 * Copyright (C) 2011 Mika Westerberg
8 *
9 * This work is based on the original dma-m2p implementation with
10 * following copyrights:
11 *
12 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
13 * Copyright (C) 2006 Applied Data Systems
14 * Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com>
15 */
16
17 #include <linux/dmaengine.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
22 #include <linux/platform_device.h>
23
24 #include <linux/platform_data/dma-ep93xx.h>
25 #include "hardware.h"
26
27 #include "soc.h"
28
29 #define DMA_CHANNEL(_name, _base, _irq) \
30 { .name = (_name), .base = (_base), .irq = (_irq) }
31
32 /*
33 * DMA M2P channels.
34 *
35 * On the EP93xx chip the following peripherals my be allocated to the 10
36 * Memory to Internal Peripheral (M2P) channels (5 transmit + 5 receive).
37 *
38 * I2S contains 3 Tx and 3 Rx DMA Channels
39 * AAC contains 3 Tx and 3 Rx DMA Channels
40 * UART1 contains 1 Tx and 1 Rx DMA Channels
41 * UART2 contains 1 Tx and 1 Rx DMA Channels
42 * UART3 contains 1 Tx and 1 Rx DMA Channels
43 * IrDA contains 1 Tx and 1 Rx DMA Channels
44 *
45 * Registers are mapped statically in ep93xx_map_io().
46 */
47 static struct ep93xx_dma_chan_data ep93xx_dma_m2p_channels[] = {
48 DMA_CHANNEL("m2p0", EP93XX_DMA_BASE + 0x0000, IRQ_EP93XX_DMAM2P0),
49 DMA_CHANNEL("m2p1", EP93XX_DMA_BASE + 0x0040, IRQ_EP93XX_DMAM2P1),
50 DMA_CHANNEL("m2p2", EP93XX_DMA_BASE + 0x0080, IRQ_EP93XX_DMAM2P2),
51 DMA_CHANNEL("m2p3", EP93XX_DMA_BASE + 0x00c0, IRQ_EP93XX_DMAM2P3),
52 DMA_CHANNEL("m2p4", EP93XX_DMA_BASE + 0x0240, IRQ_EP93XX_DMAM2P4),
53 DMA_CHANNEL("m2p5", EP93XX_DMA_BASE + 0x0200, IRQ_EP93XX_DMAM2P5),
54 DMA_CHANNEL("m2p6", EP93XX_DMA_BASE + 0x02c0, IRQ_EP93XX_DMAM2P6),
55 DMA_CHANNEL("m2p7", EP93XX_DMA_BASE + 0x0280, IRQ_EP93XX_DMAM2P7),
56 DMA_CHANNEL("m2p8", EP93XX_DMA_BASE + 0x0340, IRQ_EP93XX_DMAM2P8),
57 DMA_CHANNEL("m2p9", EP93XX_DMA_BASE + 0x0300, IRQ_EP93XX_DMAM2P9),
58 };
59
60 static struct ep93xx_dma_platform_data ep93xx_dma_m2p_data = {
61 .channels = ep93xx_dma_m2p_channels,
62 .num_channels = ARRAY_SIZE(ep93xx_dma_m2p_channels),
63 };
64
65 static u64 ep93xx_dma_m2p_mask = DMA_BIT_MASK(32);
66
67 static struct platform_device ep93xx_dma_m2p_device = {
68 .name = "ep93xx-dma-m2p",
69 .id = -1,
70 .dev = {
71 .platform_data = &ep93xx_dma_m2p_data,
72 .dma_mask = &ep93xx_dma_m2p_mask,
73 .coherent_dma_mask = DMA_BIT_MASK(32),
74 },
75 };
76
77 /*
78 * DMA M2M channels.
79 *
80 * There are 2 M2M channels which support memcpy/memset and in addition simple
81 * hardware requests from/to SSP and IDE. We do not implement an external
82 * hardware requests.
83 *
84 * Registers are mapped statically in ep93xx_map_io().
85 */
86 static struct ep93xx_dma_chan_data ep93xx_dma_m2m_channels[] = {
87 DMA_CHANNEL("m2m0", EP93XX_DMA_BASE + 0x0100, IRQ_EP93XX_DMAM2M0),
88 DMA_CHANNEL("m2m1", EP93XX_DMA_BASE + 0x0140, IRQ_EP93XX_DMAM2M1),
89 };
90
91 static struct ep93xx_dma_platform_data ep93xx_dma_m2m_data = {
92 .channels = ep93xx_dma_m2m_channels,
93 .num_channels = ARRAY_SIZE(ep93xx_dma_m2m_channels),
94 };
95
96 static u64 ep93xx_dma_m2m_mask = DMA_BIT_MASK(32);
97
98 static struct platform_device ep93xx_dma_m2m_device = {
99 .name = "ep93xx-dma-m2m",
100 .id = -1,
101 .dev = {
102 .platform_data = &ep93xx_dma_m2m_data,
103 .dma_mask = &ep93xx_dma_m2m_mask,
104 .coherent_dma_mask = DMA_BIT_MASK(32),
105 },
106 };
107
108 static int __init ep93xx_dma_init(void)
109 {
110 platform_device_register(&ep93xx_dma_m2p_device);
111 platform_device_register(&ep93xx_dma_m2m_device);
112 return 0;
113 }
114 arch_initcall(ep93xx_dma_init);
115
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.