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authorBoojin Kim <boojin.kim@samsung.com>2011-09-01 20:44:35 -0400
committerVinod Koul <vinod.koul@intel.com>2011-09-14 01:40:02 -0400
commitc4e1662550a3bd23df7cff4611eff67ba2afe078 (patch)
treee4feab2846a663b7054a4783171c4c3043037bd7 /arch/arm
parentaa0de00e4b9b3adba5db5ef5ee01e61b1b2e4329 (diff)
ARM: SAMSUNG: Add common DMA operations
This patch adds common DMA operations which are used for Samsung DMA drivers. Currently there are two types of DMA driver for Samsung SoCs. The one is S3C-DMA for S3C SoCs and the other is PL330-DMA for S5P SoCs. This patch provides funcion pointers for common DMA operations to DMA client driver like SPI and Audio. It makes DMA client drivers support multi-platform. In addition, this common DMA operations implement the shared actions that are needed for DMA client driver. For example shared actions are filter() function for dma_request_channel() and parameter passing for device_prep_slave_sg(). Signed-off-by: Boojin Kim <boojin.kim@samsung.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-s3c2410/include/mach/dma.h8
-rw-r--r--arch/arm/mach-s3c64xx/include/mach/dma.h4
-rw-r--r--arch/arm/plat-samsung/Makefile6
-rw-r--r--arch/arm/plat-samsung/dma-ops.c131
-rw-r--r--arch/arm/plat-samsung/include/plat/dma-ops.h63
-rw-r--r--arch/arm/plat-samsung/include/plat/dma-pl330.h4
-rw-r--r--arch/arm/plat-samsung/include/plat/dma.h1
-rw-r--r--arch/arm/plat-samsung/s3c-dma-ops.c133
8 files changed, 347 insertions, 3 deletions
diff --git a/arch/arm/mach-s3c2410/include/mach/dma.h b/arch/arm/mach-s3c2410/include/mach/dma.h
index b2b2a5bb275e..e61a91f88c52 100644
--- a/arch/arm/mach-s3c2410/include/mach/dma.h
+++ b/arch/arm/mach-s3c2410/include/mach/dma.h
@@ -13,7 +13,6 @@
13#ifndef __ASM_ARCH_DMA_H 13#ifndef __ASM_ARCH_DMA_H
14#define __ASM_ARCH_DMA_H __FILE__ 14#define __ASM_ARCH_DMA_H __FILE__
15 15
16#include <plat/dma.h>
17#include <linux/sysdev.h> 16#include <linux/sysdev.h>
18 17
19#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */ 18#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
@@ -51,6 +50,13 @@ enum dma_ch {
51 DMACH_MAX, /* the end entry */ 50 DMACH_MAX, /* the end entry */
52}; 51};
53 52
53static inline bool samsung_dma_is_dmadev(void)
54{
55 return false;
56}
57
58#include <plat/dma.h>
59
54#define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */ 60#define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
55 61
56/* we have 4 dma channels */ 62/* we have 4 dma channels */
diff --git a/arch/arm/mach-s3c64xx/include/mach/dma.h b/arch/arm/mach-s3c64xx/include/mach/dma.h
index 0a5d9268a23e..49c3a53135d4 100644
--- a/arch/arm/mach-s3c64xx/include/mach/dma.h
+++ b/arch/arm/mach-s3c64xx/include/mach/dma.h
@@ -63,6 +63,10 @@ static __inline__ bool s3c_dma_has_circular(void)
63 return true; 63 return true;
64} 64}
65 65
66static inline bool samsung_dma_is_dmadev(void)
67{
68 return false;
69}
66#define S3C2410_DMAF_CIRCULAR (1 << 0) 70#define S3C2410_DMAF_CIRCULAR (1 << 0)
67 71
68#include <plat/dma.h> 72#include <plat/dma.h>
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 853764ba8cc5..e2ee0b8a3763 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -63,9 +63,11 @@ obj-$(CONFIG_SAMSUNG_DEV_BACKLIGHT) += dev-backlight.o
63 63
64# DMA support 64# DMA support
65 65
66obj-$(CONFIG_S3C_DMA) += dma.o 66obj-$(CONFIG_S3C_DMA) += dma.o s3c-dma-ops.o
67 67
68obj-$(CONFIG_S3C_PL330_DMA) += s3c-pl330.o 68obj-$(CONFIG_SAMSUNG_DMADEV) += dma-ops.o
69
70obj-$(CONFIG_S3C_PL330_DMA) += s3c-pl330.o s3c-dma-ops.o
69 71
70# PM support 72# PM support
71 73
diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
new file mode 100644
index 000000000000..6e3d9abc9e2e
--- /dev/null
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -0,0 +1,131 @@
1/* linux/arch/arm/plat-samsung/dma-ops.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * Samsung DMA Operations
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/amba/pl330.h>
16#include <linux/scatterlist.h>
17
18#include <mach/dma.h>
19
20static inline bool pl330_filter(struct dma_chan *chan, void *param)
21{
22 struct dma_pl330_peri *peri = chan->private;
23 return peri->peri_id == (unsigned)param;
24}
25
26static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
27 struct samsung_dma_info *info)
28{
29 struct dma_chan *chan;
30 dma_cap_mask_t mask;
31 struct dma_slave_config slave_config;
32
33 dma_cap_zero(mask);
34 dma_cap_set(info->cap, mask);
35
36 chan = dma_request_channel(mask, pl330_filter, (void *)dma_ch);
37
38 if (info->direction == DMA_FROM_DEVICE) {
39 memset(&slave_config, 0, sizeof(struct dma_slave_config));
40 slave_config.direction = info->direction;
41 slave_config.src_addr = info->fifo;
42 slave_config.src_addr_width = info->width;
43 slave_config.src_maxburst = 1;
44 dmaengine_slave_config(chan, &slave_config);
45 } else if (info->direction == DMA_TO_DEVICE) {
46 memset(&slave_config, 0, sizeof(struct dma_slave_config));
47 slave_config.direction = info->direction;
48 slave_config.dst_addr = info->fifo;
49 slave_config.dst_addr_width = info->width;
50 slave_config.dst_maxburst = 1;
51 dmaengine_slave_config(chan, &slave_config);
52 }
53
54 return (unsigned)chan;
55}
56
57static int samsung_dmadev_release(unsigned ch,
58 struct s3c2410_dma_client *client)
59{
60 dma_release_channel((struct dma_chan *)ch);
61
62 return 0;
63}
64
65static int samsung_dmadev_prepare(unsigned ch,
66 struct samsung_dma_prep_info *info)
67{
68 struct scatterlist sg;
69 struct dma_chan *chan = (struct dma_chan *)ch;
70 struct dma_async_tx_descriptor *desc;
71
72 switch (info->cap) {
73 case DMA_SLAVE:
74 sg_init_table(&sg, 1);
75 sg_dma_len(&sg) = info->len;
76 sg_set_page(&sg, pfn_to_page(PFN_DOWN(info->buf)),
77 info->len, offset_in_page(info->buf));
78 sg_dma_address(&sg) = info->buf;
79
80 desc = chan->device->device_prep_slave_sg(chan,
81 &sg, 1, info->direction, DMA_PREP_INTERRUPT);
82 break;
83 case DMA_CYCLIC:
84 desc = chan->device->device_prep_dma_cyclic(chan,
85 info->buf, info->len, info->period, info->direction);
86 break;
87 default:
88 dev_err(&chan->dev->device, "unsupported format\n");
89 return -EFAULT;
90 }
91
92 if (!desc) {
93 dev_err(&chan->dev->device, "cannot prepare cyclic dma\n");
94 return -EFAULT;
95 }
96
97 desc->callback = info->fp;
98 desc->callback_param = info->fp_param;
99
100 dmaengine_submit((struct dma_async_tx_descriptor *)desc);
101
102 return 0;
103}
104
105static inline int samsung_dmadev_trigger(unsigned ch)
106{
107 dma_async_issue_pending((struct dma_chan *)ch);
108
109 return 0;
110}
111
112static inline int samsung_dmadev_flush(unsigned ch)
113{
114 return dmaengine_terminate_all((struct dma_chan *)ch);
115}
116
117struct samsung_dma_ops dmadev_ops = {
118 .request = samsung_dmadev_request,
119 .release = samsung_dmadev_release,
120 .prepare = samsung_dmadev_prepare,
121 .trigger = samsung_dmadev_trigger,
122 .started = NULL,
123 .flush = samsung_dmadev_flush,
124 .stop = samsung_dmadev_flush,
125};
126
127void *samsung_dmadev_get_ops(void)
128{
129 return &dmadev_ops;
130}
131EXPORT_SYMBOL(samsung_dmadev_get_ops);
diff --git a/arch/arm/plat-samsung/include/plat/dma-ops.h b/arch/arm/plat-samsung/include/plat/dma-ops.h
new file mode 100644
index 000000000000..4c1a363526cf
--- /dev/null
+++ b/arch/arm/plat-samsung/include/plat/dma-ops.h
@@ -0,0 +1,63 @@
1/* arch/arm/plat-samsung/include/plat/dma-ops.h
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * Samsung DMA support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef __SAMSUNG_DMA_OPS_H_
14#define __SAMSUNG_DMA_OPS_H_ __FILE__
15
16#include <linux/dmaengine.h>
17
18struct samsung_dma_prep_info {
19 enum dma_transaction_type cap;
20 enum dma_data_direction direction;
21 dma_addr_t buf;
22 unsigned long period;
23 unsigned long len;
24 void (*fp)(void *data);
25 void *fp_param;
26};
27
28struct samsung_dma_info {
29 enum dma_transaction_type cap;
30 enum dma_data_direction direction;
31 enum dma_slave_buswidth width;
32 dma_addr_t fifo;
33 struct s3c2410_dma_client *client;
34};
35
36struct samsung_dma_ops {
37 unsigned (*request)(enum dma_ch ch, struct samsung_dma_info *info);
38 int (*release)(unsigned ch, struct s3c2410_dma_client *client);
39 int (*prepare)(unsigned ch, struct samsung_dma_prep_info *info);
40 int (*trigger)(unsigned ch);
41 int (*started)(unsigned ch);
42 int (*flush)(unsigned ch);
43 int (*stop)(unsigned ch);
44};
45
46extern void *samsung_dmadev_get_ops(void);
47extern void *s3c_dma_get_ops(void);
48
49static inline void *__samsung_dma_get_ops(void)
50{
51 if (samsung_dma_is_dmadev())
52 return samsung_dmadev_get_ops();
53 else
54 return s3c_dma_get_ops();
55}
56
57/*
58 * samsung_dma_get_ops
59 * get the set of samsung dma operations
60 */
61#define samsung_dma_get_ops() __samsung_dma_get_ops()
62
63#endif /* __SAMSUNG_DMA_OPS_H_ */
diff --git a/arch/arm/plat-samsung/include/plat/dma-pl330.h b/arch/arm/plat-samsung/include/plat/dma-pl330.h
index 0a5dade0e85c..2916920034f0 100644
--- a/arch/arm/plat-samsung/include/plat/dma-pl330.h
+++ b/arch/arm/plat-samsung/include/plat/dma-pl330.h
@@ -93,6 +93,10 @@ static inline bool s3c_dma_has_circular(void)
93 return true; 93 return true;
94} 94}
95 95
96static inline bool samsung_dma_is_dmadev(void)
97{
98 return true;
99}
96#include <plat/dma.h> 100#include <plat/dma.h>
97 101
98#endif /* __DMA_PL330_H_ */ 102#endif /* __DMA_PL330_H_ */
diff --git a/arch/arm/plat-samsung/include/plat/dma.h b/arch/arm/plat-samsung/include/plat/dma.h
index 8c273b7a6f56..361076060744 100644
--- a/arch/arm/plat-samsung/include/plat/dma.h
+++ b/arch/arm/plat-samsung/include/plat/dma.h
@@ -126,3 +126,4 @@ extern int s3c2410_dma_set_opfn(enum dma_ch, s3c2410_dma_opfn_t rtn);
126extern int s3c2410_dma_set_buffdone_fn(enum dma_ch, s3c2410_dma_cbfn_t rtn); 126extern int s3c2410_dma_set_buffdone_fn(enum dma_ch, s3c2410_dma_cbfn_t rtn);
127 127
128 128
129#include <plat/dma-ops.h>
diff --git a/arch/arm/plat-samsung/s3c-dma-ops.c b/arch/arm/plat-samsung/s3c-dma-ops.c
new file mode 100644
index 000000000000..33ab3241268d
--- /dev/null
+++ b/arch/arm/plat-samsung/s3c-dma-ops.c
@@ -0,0 +1,133 @@
1/* linux/arch/arm/plat-samsung/s3c-dma-ops.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * Samsung S3C-DMA Operations
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/types.h>
17
18#include <mach/dma.h>
19
20struct cb_data {
21 void (*fp) (void *);
22 void *fp_param;
23 unsigned ch;
24 struct list_head node;
25};
26
27static LIST_HEAD(dma_list);
28
29static void s3c_dma_cb(struct s3c2410_dma_chan *channel, void *param,
30 int size, enum s3c2410_dma_buffresult res)
31{
32 struct cb_data *data = param;
33
34 data->fp(data->fp_param);
35}
36
37static unsigned s3c_dma_request(enum dma_ch dma_ch,
38 struct samsung_dma_info *info)
39{
40 struct cb_data *data;
41
42 if (s3c2410_dma_request(dma_ch, info->client, NULL) < 0) {
43 s3c2410_dma_free(dma_ch, info->client);
44 return 0;
45 }
46
47 data = kzalloc(sizeof(struct cb_data), GFP_KERNEL);
48 data->ch = dma_ch;
49 list_add_tail(&data->node, &dma_list);
50
51 if (info->direction == DMA_FROM_DEVICE)
52 s3c2410_dma_devconfig(dma_ch, S3C2410_DMASRC_HW, info->fifo);
53 else
54 s3c2410_dma_devconfig(dma_ch, S3C2410_DMASRC_MEM, info->fifo);
55
56 if (info->cap == DMA_CYCLIC)
57 s3c2410_dma_setflags(dma_ch, S3C2410_DMAF_CIRCULAR);
58
59 s3c2410_dma_config(dma_ch, info->width);
60
61 return (unsigned)dma_ch;
62}
63
64static int s3c_dma_release(unsigned ch, struct s3c2410_dma_client *client)
65{
66 struct cb_data *data;
67
68 list_for_each_entry(data, &dma_list, node)
69 if (data->ch == ch)
70 break;
71 list_del(&data->node);
72
73 s3c2410_dma_free(ch, client);
74 kfree(data);
75
76 return 0;
77}
78
79static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep_info *info)
80{
81 struct cb_data *data;
82 int len = (info->cap == DMA_CYCLIC) ? info->period : info->len;
83
84 list_for_each_entry(data, &dma_list, node)
85 if (data->ch == ch)
86 break;
87
88 if (!data->fp) {
89 s3c2410_dma_set_buffdone_fn(ch, s3c_dma_cb);
90 data->fp = info->fp;
91 data->fp_param = info->fp_param;
92 }
93
94 s3c2410_dma_enqueue(ch, (void *)data, info->buf, len);
95
96 return 0;
97}
98
99static inline int s3c_dma_trigger(unsigned ch)
100{
101 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_START);
102}
103
104static inline int s3c_dma_started(unsigned ch)
105{
106 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STARTED);
107}
108
109static inline int s3c_dma_flush(unsigned ch)
110{
111 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_FLUSH);
112}
113
114static inline int s3c_dma_stop(unsigned ch)
115{
116 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STOP);
117}
118
119static struct samsung_dma_ops s3c_dma_ops = {
120 .request = s3c_dma_request,
121 .release = s3c_dma_release,
122 .prepare = s3c_dma_prepare,
123 .trigger = s3c_dma_trigger,
124 .started = s3c_dma_started,
125 .flush = s3c_dma_flush,
126 .stop = s3c_dma_stop,
127};
128
129void *s3c_dma_get_ops(void)
130{
131 return &s3c_dma_ops;
132}
133EXPORT_SYMBOL(s3c_dma_get_ops);