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authorMika Westerberg <mika.westerberg@iki.fi>2011-05-29 06:10:03 -0400
committerGrant Likely <grant.likely@secretlab.ca>2011-06-08 17:45:52 -0400
commite791e3455f1b7e92f0b66f460ade9c7a2299ac7e (patch)
tree6cb3598182ab413d95dde459e5ab217607814245
parent760ee1c4aafac8fcaf3be5ff2b19c5485c5886e1 (diff)
ep93xx: add dmaengine platform code
Add platform support code for the new EP93xx dmaengine driver. Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> Signed-off-by: Ryan Mallon <rmallon@gmail.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
-rw-r--r--arch/arm/mach-ep93xx/Makefile2
-rw-r--r--arch/arm/mach-ep93xx/dma.c108
2 files changed, 110 insertions, 0 deletions
diff --git a/arch/arm/mach-ep93xx/Makefile b/arch/arm/mach-ep93xx/Makefile
index 33ee2c863d18..4920f7ae8330 100644
--- a/arch/arm/mach-ep93xx/Makefile
+++ b/arch/arm/mach-ep93xx/Makefile
@@ -6,6 +6,8 @@ obj-m :=
6obj-n := 6obj-n :=
7obj- := 7obj- :=
8 8
9obj-$(CONFIG_EP93XX_DMA) += dma.o
10
9obj-$(CONFIG_MACH_ADSSPHERE) += adssphere.o 11obj-$(CONFIG_MACH_ADSSPHERE) += adssphere.o
10obj-$(CONFIG_MACH_EDB93XX) += edb93xx.o 12obj-$(CONFIG_MACH_EDB93XX) += edb93xx.o
11obj-$(CONFIG_MACH_GESBC9312) += gesbc9312.o 13obj-$(CONFIG_MACH_GESBC9312) += gesbc9312.o
diff --git a/arch/arm/mach-ep93xx/dma.c b/arch/arm/mach-ep93xx/dma.c
new file mode 100644
index 000000000000..5a2570881255
--- /dev/null
+++ b/arch/arm/mach-ep93xx/dma.c
@@ -0,0 +1,108 @@
1/*
2 * arch/arm/mach-ep93xx/dma.c
3 *
4 * Platform support code for the EP93xx dmaengine driver.
5 *
6 * Copyright (C) 2011 Mika Westerberg
7 *
8 * This work is based on the original dma-m2p implementation with
9 * following copyrights:
10 *
11 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
12 * Copyright (C) 2006 Applied Data Systems
13 * Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com>
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or (at
18 * your option) any later version.
19 */
20
21#include <linux/dmaengine.h>
22#include <linux/dma-mapping.h>
23#include <linux/init.h>
24#include <linux/interrupt.h>
25#include <linux/kernel.h>
26#include <linux/platform_device.h>
27
28#include <mach/dma.h>
29#include <mach/hardware.h>
30
31#define DMA_CHANNEL(_name, _base, _irq) \
32 { .name = (_name), .base = (_base), .irq = (_irq) }
33
34/*
35 * DMA M2P channels.
36 *
37 * On the EP93xx chip the following peripherals my be allocated to the 10
38 * Memory to Internal Peripheral (M2P) channels (5 transmit + 5 receive).
39 *
40 * I2S contains 3 Tx and 3 Rx DMA Channels
41 * AAC contains 3 Tx and 3 Rx DMA Channels
42 * UART1 contains 1 Tx and 1 Rx DMA Channels
43 * UART2 contains 1 Tx and 1 Rx DMA Channels
44 * UART3 contains 1 Tx and 1 Rx DMA Channels
45 * IrDA contains 1 Tx and 1 Rx DMA Channels
46 *
47 * Registers are mapped statically in ep93xx_map_io().
48 */
49static struct ep93xx_dma_chan_data ep93xx_dma_m2p_channels[] = {
50 DMA_CHANNEL("m2p0", EP93XX_DMA_BASE + 0x0000, IRQ_EP93XX_DMAM2P0),
51 DMA_CHANNEL("m2p1", EP93XX_DMA_BASE + 0x0040, IRQ_EP93XX_DMAM2P1),
52 DMA_CHANNEL("m2p2", EP93XX_DMA_BASE + 0x0080, IRQ_EP93XX_DMAM2P2),
53 DMA_CHANNEL("m2p3", EP93XX_DMA_BASE + 0x00c0, IRQ_EP93XX_DMAM2P3),
54 DMA_CHANNEL("m2p4", EP93XX_DMA_BASE + 0x0240, IRQ_EP93XX_DMAM2P4),
55 DMA_CHANNEL("m2p5", EP93XX_DMA_BASE + 0x0200, IRQ_EP93XX_DMAM2P5),
56 DMA_CHANNEL("m2p6", EP93XX_DMA_BASE + 0x02c0, IRQ_EP93XX_DMAM2P6),
57 DMA_CHANNEL("m2p7", EP93XX_DMA_BASE + 0x0280, IRQ_EP93XX_DMAM2P7),
58 DMA_CHANNEL("m2p8", EP93XX_DMA_BASE + 0x0340, IRQ_EP93XX_DMAM2P8),
59 DMA_CHANNEL("m2p9", EP93XX_DMA_BASE + 0x0300, IRQ_EP93XX_DMAM2P9),
60};
61
62static struct ep93xx_dma_platform_data ep93xx_dma_m2p_data = {
63 .channels = ep93xx_dma_m2p_channels,
64 .num_channels = ARRAY_SIZE(ep93xx_dma_m2p_channels),
65};
66
67static 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 },
73};
74
75/*
76 * DMA M2M channels.
77 *
78 * There are 2 M2M channels which support memcpy/memset and in addition simple
79 * hardware requests from/to SSP and IDE. We do not implement an external
80 * hardware requests.
81 *
82 * Registers are mapped statically in ep93xx_map_io().
83 */
84static struct ep93xx_dma_chan_data ep93xx_dma_m2m_channels[] = {
85 DMA_CHANNEL("m2m0", EP93XX_DMA_BASE + 0x0100, IRQ_EP93XX_DMAM2M0),
86 DMA_CHANNEL("m2m1", EP93XX_DMA_BASE + 0x0140, IRQ_EP93XX_DMAM2M1),
87};
88
89static struct ep93xx_dma_platform_data ep93xx_dma_m2m_data = {
90 .channels = ep93xx_dma_m2m_channels,
91 .num_channels = ARRAY_SIZE(ep93xx_dma_m2m_channels),
92};
93
94static struct platform_device ep93xx_dma_m2m_device = {
95 .name = "ep93xx-dma-m2m",
96 .id = -1,
97 .dev = {
98 .platform_data = &ep93xx_dma_m2m_data,
99 },
100};
101
102static int __init ep93xx_dma_init(void)
103{
104 platform_device_register(&ep93xx_dma_m2p_device);
105 platform_device_register(&ep93xx_dma_m2m_device);
106 return 0;
107}
108arch_initcall(ep93xx_dma_init);