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review.evervolv.com / android_kernel_htc_msm8960 / 51533b615e605d86154ec1b4e585c8ca1b0b15b7 / . / arch / cris / arch-v32 / kernel / dma.c
blob: b92e85799b449d2955cfeedefb856f25234cc68c [file] [log] [blame]
Mikael Starvik51533b62005-07-27 11:44:44 -0700[diff] [blame^]1/* Wrapper for DMA channel allocator that starts clocks etc */
2
3#include <linux/kernel.h>
4#include <linux/spinlock.h>
5#include <asm/dma.h>
6#include <asm/arch/hwregs/reg_map.h>
7#include <asm/arch/hwregs/reg_rdwr.h>
8#include <asm/arch/hwregs/marb_defs.h>
9#include <asm/arch/hwregs/config_defs.h>
10#include <asm/arch/hwregs/strmux_defs.h>
11#include <linux/errno.h>
12#include <asm/system.h>
13#include <asm/arch/arbiter.h>
14
15static char used_dma_channels[MAX_DMA_CHANNELS];
16static const char * used_dma_channels_users[MAX_DMA_CHANNELS];
17
18static DEFINE_SPINLOCK(dma_lock);
19
20int crisv32_request_dma(unsigned int dmanr, const char * device_id,
21 unsigned options, unsigned int bandwidth,
22 enum dma_owner owner)
23{
24 unsigned long flags;
25 reg_config_rw_clk_ctrl clk_ctrl;
26 reg_strmux_rw_cfg strmux_cfg;
27
28 if (crisv32_arbiter_allocate_bandwith(dmanr,
29 options & DMA_INT_MEM ? INT_REGION : EXT_REGION,
30 bandwidth))
31 return -ENOMEM;
32
33 spin_lock_irqsave(&dma_lock, flags);
34
35 if (used_dma_channels[dmanr]) {
36 spin_unlock_irqrestore(&dma_lock, flags);
37 if (options & DMA_VERBOSE_ON_ERROR) {
38 printk("Failed to request DMA %i for %s, already allocated by %s\n", dmanr, device_id, used_dma_channels_users[dmanr]);
39 }
40 if (options & DMA_PANIC_ON_ERROR)
41 panic("request_dma error!");
42 return -EBUSY;
43 }
44 clk_ctrl = REG_RD(config, regi_config, rw_clk_ctrl);
45 strmux_cfg = REG_RD(strmux, regi_strmux, rw_cfg);
46
47 switch(dmanr)
48 {
49 case 0:
50 case 1:
51 clk_ctrl.dma01_eth0 = 1;
52 break;
53 case 2:
54 case 3:
55 clk_ctrl.dma23 = 1;
56 break;
57 case 4:
58 case 5:
59 clk_ctrl.dma45 = 1;
60 break;
61 case 6:
62 case 7:
63 clk_ctrl.dma67 = 1;
64 break;
65 case 8:
66 case 9:
67 clk_ctrl.dma89_strcop = 1;
68 break;
69#if MAX_DMA_CHANNELS-1 != 9
70#error Check dma.c
71#endif
72 default:
73 spin_unlock_irqrestore(&dma_lock, flags);
74 if (options & DMA_VERBOSE_ON_ERROR) {
75 printk("Failed to request DMA %i for %s, only 0-%i valid)\n", dmanr, device_id, MAX_DMA_CHANNELS-1);
76 }
77
78 if (options & DMA_PANIC_ON_ERROR)
79 panic("request_dma error!");
80 return -EINVAL;
81 }
82
83 switch(owner)
84 {
85 case dma_eth0:
86 if (dmanr == 0)
87 strmux_cfg.dma0 = regk_strmux_eth0;
88 else if (dmanr == 1)
89 strmux_cfg.dma1 = regk_strmux_eth0;
90 else
91 panic("Invalid DMA channel for eth0\n");
92 break;
93 case dma_eth1:
94 if (dmanr == 6)
95 strmux_cfg.dma6 = regk_strmux_eth1;
96 else if (dmanr == 7)
97 strmux_cfg.dma7 = regk_strmux_eth1;
98 else
99 panic("Invalid DMA channel for eth1\n");
100 break;
101 case dma_iop0:
102 if (dmanr == 2)
103 strmux_cfg.dma2 = regk_strmux_iop0;
104 else if (dmanr == 3)
105 strmux_cfg.dma3 = regk_strmux_iop0;
106 else
107 panic("Invalid DMA channel for iop0\n");
108 break;
109 case dma_iop1:
110 if (dmanr == 4)
111 strmux_cfg.dma4 = regk_strmux_iop1;
112 else if (dmanr == 5)
113 strmux_cfg.dma5 = regk_strmux_iop1;
114 else
115 panic("Invalid DMA channel for iop1\n");
116 break;
117 case dma_ser0:
118 if (dmanr == 6)
119 strmux_cfg.dma6 = regk_strmux_ser0;
120 else if (dmanr == 7)
121 strmux_cfg.dma7 = regk_strmux_ser0;
122 else
123 panic("Invalid DMA channel for ser0\n");
124 break;
125 case dma_ser1:
126 if (dmanr == 4)
127 strmux_cfg.dma4 = regk_strmux_ser1;
128 else if (dmanr == 5)
129 strmux_cfg.dma5 = regk_strmux_ser1;
130 else
131 panic("Invalid DMA channel for ser1\n");
132 break;
133 case dma_ser2:
134 if (dmanr == 2)
135 strmux_cfg.dma2 = regk_strmux_ser2;
136 else if (dmanr == 3)
137 strmux_cfg.dma3 = regk_strmux_ser2;
138 else
139 panic("Invalid DMA channel for ser2\n");
140 break;
141 case dma_ser3:
142 if (dmanr == 8)
143 strmux_cfg.dma8 = regk_strmux_ser3;
144 else if (dmanr == 9)
145 strmux_cfg.dma9 = regk_strmux_ser3;
146 else
147 panic("Invalid DMA channel for ser3\n");
148 break;
149 case dma_sser0:
150 if (dmanr == 4)
151 strmux_cfg.dma4 = regk_strmux_sser0;
152 else if (dmanr == 5)
153 strmux_cfg.dma5 = regk_strmux_sser0;
154 else
155 panic("Invalid DMA channel for sser0\n");
156 break;
157 case dma_sser1:
158 if (dmanr == 6)
159 strmux_cfg.dma6 = regk_strmux_sser1;
160 else if (dmanr == 7)
161 strmux_cfg.dma7 = regk_strmux_sser1;
162 else
163 panic("Invalid DMA channel for sser1\n");
164 break;
165 case dma_ata:
166 if (dmanr == 2)
167 strmux_cfg.dma2 = regk_strmux_ata;
168 else if (dmanr == 3)
169 strmux_cfg.dma3 = regk_strmux_ata;
170 else
171 panic("Invalid DMA channel for ata\n");
172 break;
173 case dma_strp:
174 if (dmanr == 8)
175 strmux_cfg.dma8 = regk_strmux_strcop;
176 else if (dmanr == 9)
177 strmux_cfg.dma9 = regk_strmux_strcop;
178 else
179 panic("Invalid DMA channel for strp\n");
180 break;
181 case dma_ext0:
182 if (dmanr == 6)
183 strmux_cfg.dma6 = regk_strmux_ext0;
184 else
185 panic("Invalid DMA channel for ext0\n");
186 break;
187 case dma_ext1:
188 if (dmanr == 7)
189 strmux_cfg.dma7 = regk_strmux_ext1;
190 else
191 panic("Invalid DMA channel for ext1\n");
192 break;
193 case dma_ext2:
194 if (dmanr == 2)
195 strmux_cfg.dma2 = regk_strmux_ext2;
196 else if (dmanr == 8)
197 strmux_cfg.dma8 = regk_strmux_ext2;
198 else
199 panic("Invalid DMA channel for ext2\n");
200 break;
201 case dma_ext3:
202 if (dmanr == 3)
203 strmux_cfg.dma3 = regk_strmux_ext3;
204 else if (dmanr == 9)
205 strmux_cfg.dma9 = regk_strmux_ext2;
206 else
207 panic("Invalid DMA channel for ext2\n");
208 break;
209 }
210
211 used_dma_channels[dmanr] = 1;
212 used_dma_channels_users[dmanr] = device_id;
213 REG_WR(config, regi_config, rw_clk_ctrl, clk_ctrl);
214 REG_WR(strmux, regi_strmux, rw_cfg, strmux_cfg);
215 spin_unlock_irqrestore(&dma_lock,flags);
216 return 0;
217}
218
219void crisv32_free_dma(unsigned int dmanr)
220{
221 spin_lock(&dma_lock);
222 used_dma_channels[dmanr] = 0;
223 spin_unlock(&dma_lock);
224}