1 /* linux/arch/arm/mach-s3c2412/dma.c
2  *
3  * Copyright (c) 2006 Simtec Electronics
4  *	Ben Dooks <ben@simtec.co.uk>
5  *
6  * S3C2412 DMA selection
7  *
8  * http://armlinux.simtec.co.uk/
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13 */
14 
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/sysdev.h>
18 #include <linux/serial_core.h>
19 #include <linux/io.h>
20 
21 #include <mach/dma.h>
22 
23 #include <plat/dma-s3c24xx.h>
24 #include <plat/cpu.h>
25 
26 #include <plat/regs-serial.h>
27 #include <mach/regs-gpio.h>
28 #include <plat/regs-ac97.h>
29 #include <plat/regs-dma.h>
30 #include <mach/regs-mem.h>
31 #include <mach/regs-lcd.h>
32 #include <mach/regs-sdi.h>
33 #include <plat/regs-iis.h>
34 #include <plat/regs-spi.h>
35 
36 #define MAP(x) { (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID, (x)| DMA_CH_VALID }
37 
38 static struct s3c24xx_dma_map __initdata s3c2412_dma_mappings[] = {
39 	[DMACH_XD0] = {
40 		.name		= "xdreq0",
41 		.channels	= MAP(S3C2412_DMAREQSEL_XDREQ0),
42 		.channels_rx	= MAP(S3C2412_DMAREQSEL_XDREQ0),
43 	},
44 	[DMACH_XD1] = {
45 		.name		= "xdreq1",
46 		.channels	= MAP(S3C2412_DMAREQSEL_XDREQ1),
47 		.channels_rx	= MAP(S3C2412_DMAREQSEL_XDREQ1),
48 	},
49 	[DMACH_SDI] = {
50 		.name		= "sdi",
51 		.channels	= MAP(S3C2412_DMAREQSEL_SDI),
52 		.channels_rx	= MAP(S3C2412_DMAREQSEL_SDI),
53 		.hw_addr.to	= S3C2410_PA_SDI + S3C2410_SDIDATA,
54 		.hw_addr.from	= S3C2410_PA_SDI + S3C2410_SDIDATA,
55 	},
56 	[DMACH_SPI0] = {
57 		.name		= "spi0",
58 		.channels	= MAP(S3C2412_DMAREQSEL_SPI0TX),
59 		.channels_rx	= MAP(S3C2412_DMAREQSEL_SPI0RX),
60 		.hw_addr.to	= S3C2410_PA_SPI + S3C2410_SPTDAT,
61 		.hw_addr.from	= S3C2410_PA_SPI + S3C2410_SPRDAT,
62 	},
63 	[DMACH_SPI1] = {
64 		.name		= "spi1",
65 		.channels	= MAP(S3C2412_DMAREQSEL_SPI1TX),
66 		.channels_rx	= MAP(S3C2412_DMAREQSEL_SPI1RX),
67 		.hw_addr.to	= S3C2410_PA_SPI + S3C2412_SPI1 + S3C2410_SPTDAT,
68 		.hw_addr.from	= S3C2410_PA_SPI + S3C2412_SPI1  + S3C2410_SPRDAT,
69 	},
70 	[DMACH_UART0] = {
71 		.name		= "uart0",
72 		.channels	= MAP(S3C2412_DMAREQSEL_UART0_0),
73 		.channels_rx	= MAP(S3C2412_DMAREQSEL_UART0_0),
74 		.hw_addr.to	= S3C2410_PA_UART0 + S3C2410_UTXH,
75 		.hw_addr.from	= S3C2410_PA_UART0 + S3C2410_URXH,
76 	},
77 	[DMACH_UART1] = {
78 		.name		= "uart1",
79 		.channels	= MAP(S3C2412_DMAREQSEL_UART1_0),
80 		.channels_rx	= MAP(S3C2412_DMAREQSEL_UART1_0),
81 		.hw_addr.to	= S3C2410_PA_UART1 + S3C2410_UTXH,
82 		.hw_addr.from	= S3C2410_PA_UART1 + S3C2410_URXH,
83 	},
84       	[DMACH_UART2] = {
85 		.name		= "uart2",
86 		.channels	= MAP(S3C2412_DMAREQSEL_UART2_0),
87 		.channels_rx	= MAP(S3C2412_DMAREQSEL_UART2_0),
88 		.hw_addr.to	= S3C2410_PA_UART2 + S3C2410_UTXH,
89 		.hw_addr.from	= S3C2410_PA_UART2 + S3C2410_URXH,
90 	},
91 	[DMACH_UART0_SRC2] = {
92 		.name		= "uart0",
93 		.channels	= MAP(S3C2412_DMAREQSEL_UART0_1),
94 		.channels_rx	= MAP(S3C2412_DMAREQSEL_UART0_1),
95 		.hw_addr.to	= S3C2410_PA_UART0 + S3C2410_UTXH,
96 		.hw_addr.from	= S3C2410_PA_UART0 + S3C2410_URXH,
97 	},
98 	[DMACH_UART1_SRC2] = {
99 		.name		= "uart1",
100 		.channels	= MAP(S3C2412_DMAREQSEL_UART1_1),
101 		.channels_rx	= MAP(S3C2412_DMAREQSEL_UART1_1),
102 		.hw_addr.to	= S3C2410_PA_UART1 + S3C2410_UTXH,
103 		.hw_addr.from	= S3C2410_PA_UART1 + S3C2410_URXH,
104 	},
105       	[DMACH_UART2_SRC2] = {
106 		.name		= "uart2",
107 		.channels	= MAP(S3C2412_DMAREQSEL_UART2_1),
108 		.channels_rx	= MAP(S3C2412_DMAREQSEL_UART2_1),
109 		.hw_addr.to	= S3C2410_PA_UART2 + S3C2410_UTXH,
110 		.hw_addr.from	= S3C2410_PA_UART2 + S3C2410_URXH,
111 	},
112 	[DMACH_TIMER] = {
113 		.name		= "timer",
114 		.channels	= MAP(S3C2412_DMAREQSEL_TIMER),
115 		.channels_rx	= MAP(S3C2412_DMAREQSEL_TIMER),
116 	},
117 	[DMACH_I2S_IN] = {
118 		.name		= "i2s-sdi",
119 		.channels	= MAP(S3C2412_DMAREQSEL_I2SRX),
120 		.channels_rx	= MAP(S3C2412_DMAREQSEL_I2SRX),
121 	},
122 	[DMACH_I2S_OUT] = {
123 		.name		= "i2s-sdo",
124 		.channels	= MAP(S3C2412_DMAREQSEL_I2STX),
125 		.channels_rx	= MAP(S3C2412_DMAREQSEL_I2STX),
126 	},
127 	[DMACH_USB_EP1] = {
128 		.name		= "usb-ep1",
129 		.channels	= MAP(S3C2412_DMAREQSEL_USBEP1),
130 		.channels_rx	= MAP(S3C2412_DMAREQSEL_USBEP1),
131 	},
132 	[DMACH_USB_EP2] = {
133 		.name		= "usb-ep2",
134 		.channels	= MAP(S3C2412_DMAREQSEL_USBEP2),
135 		.channels_rx	= MAP(S3C2412_DMAREQSEL_USBEP2),
136 	},
137 	[DMACH_USB_EP3] = {
138 		.name		= "usb-ep3",
139 		.channels	= MAP(S3C2412_DMAREQSEL_USBEP3),
140 		.channels_rx	= MAP(S3C2412_DMAREQSEL_USBEP3),
141 	},
142 	[DMACH_USB_EP4] = {
143 		.name		= "usb-ep4",
144 		.channels	= MAP(S3C2412_DMAREQSEL_USBEP4),
145 		.channels_rx	= MAP(S3C2412_DMAREQSEL_USBEP4),
146 	},
147 };
148 
s3c2412_dma_direction(struct s3c2410_dma_chan * chan,struct s3c24xx_dma_map * map,enum s3c2410_dmasrc dir)149 static void s3c2412_dma_direction(struct s3c2410_dma_chan *chan,
150 				  struct s3c24xx_dma_map *map,
151 				  enum s3c2410_dmasrc dir)
152 {
153 	unsigned long chsel;
154 
155 	if (dir == S3C2410_DMASRC_HW)
156 		chsel = map->channels_rx[0];
157 	else
158 		chsel = map->channels[0];
159 
160 	chsel &= ~DMA_CH_VALID;
161 	chsel |= S3C2412_DMAREQSEL_HW;
162 
163 	writel(chsel, chan->regs + S3C2412_DMA_DMAREQSEL);
164 }
165 
s3c2412_dma_select(struct s3c2410_dma_chan * chan,struct s3c24xx_dma_map * map)166 static void s3c2412_dma_select(struct s3c2410_dma_chan *chan,
167 			       struct s3c24xx_dma_map *map)
168 {
169 	s3c2412_dma_direction(chan, map, chan->source);
170 }
171 
172 static struct s3c24xx_dma_selection __initdata s3c2412_dma_sel = {
173 	.select		= s3c2412_dma_select,
174 	.direction	= s3c2412_dma_direction,
175 	.dcon_mask	= 0,
176 	.map		= s3c2412_dma_mappings,
177 	.map_size	= ARRAY_SIZE(s3c2412_dma_mappings),
178 };
179 
s3c2412_dma_add(struct sys_device * sysdev)180 static int __init s3c2412_dma_add(struct sys_device *sysdev)
181 {
182 	s3c2410_dma_init();
183 	return s3c24xx_dma_init_map(&s3c2412_dma_sel);
184 }
185 
186 static struct sysdev_driver s3c2412_dma_driver = {
187 	.add	= s3c2412_dma_add,
188 };
189 
s3c2412_dma_init(void)190 static int __init s3c2412_dma_init(void)
191 {
192 	return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_dma_driver);
193 }
194 
195 arch_initcall(s3c2412_dma_init);
196