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gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / arch / cris / arch-v32 / mach-a3 / dma.c
blob: 47c64bf40eaee9371d022456be8db18dc6761660 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[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 <mach/dma.h>
6#include <hwregs/reg_map.h>
7#include <hwregs/reg_rdwr.h>
8#include <hwregs/marb_defs.h>
9#include <hwregs/clkgen_defs.h>
10#include <hwregs/strmux_defs.h>
11#include <linux/errno.h>
12#include <arbiter.h>
13
14static char used_dma_channels[MAX_DMA_CHANNELS];
15static const char *used_dma_channels_users[MAX_DMA_CHANNELS];
16
17static DEFINE_SPINLOCK(dma_lock);
18
19int crisv32_request_dma(unsigned int dmanr, const char *device_id,
20 unsigned options, unsigned int bandwidth, enum dma_owner owner)
21{
22 unsigned long flags;
23 reg_clkgen_rw_clk_ctrl clk_ctrl;
24 reg_strmux_rw_cfg strmux_cfg;
25
26 if (crisv32_arbiter_allocate_bandwidth(dmanr,
27 options & DMA_INT_MEM ? INT_REGION : EXT_REGION,
28 bandwidth))
29 return -ENOMEM;
30
31 spin_lock_irqsave(&dma_lock, flags);
32
33 if (used_dma_channels[dmanr]) {
34 spin_unlock_irqrestore(&dma_lock, flags);
35 if (options & DMA_VERBOSE_ON_ERROR)
36 printk(KERN_ERR "Failed to request DMA %i for %s, "
37 "already allocated by %s\n",
38 dmanr,
39 device_id,
40 used_dma_channels_users[dmanr]);
41
42 if (options & DMA_PANIC_ON_ERROR)
43 panic("request_dma error!");
44 spin_unlock_irqrestore(&dma_lock, flags);
45 return -EBUSY;
46 }
47 clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
48 strmux_cfg = REG_RD(strmux, regi_strmux, rw_cfg);
49
50 switch (dmanr) {
51 case 0:
52 case 1:
53 clk_ctrl.dma0_1_eth = 1;
54 break;
55 case 2:
56 case 3:
57 clk_ctrl.dma2_3_strcop = 1;
58 break;
59 case 4:
60 case 5:
61 clk_ctrl.dma4_5_iop = 1;
62 break;
63 case 6:
64 case 7:
65 clk_ctrl.sser_ser_dma6_7 = 1;
66 break;
67 case 9:
68 case 11:
69 clk_ctrl.dma9_11 = 1;
70 break;
71#if MAX_DMA_CHANNELS-1 != 11
72#error Check dma.c
73#endif
74 default:
75 spin_unlock_irqrestore(&dma_lock, flags);
76 if (options & DMA_VERBOSE_ON_ERROR)
77 printk(KERN_ERR "Failed to request DMA %i for %s, "
78 "only 0-%i valid)\n",
79 dmanr, device_id, MAX_DMA_CHANNELS-1);
80
81 if (options & DMA_PANIC_ON_ERROR)
82 panic("request_dma error!");
83 return -EINVAL;
84 }
85
86 switch (owner) {
87 case dma_eth:
88 if (dmanr == 0)
89 strmux_cfg.dma0 = regk_strmux_eth;
90 else if (dmanr == 1)
91 strmux_cfg.dma1 = regk_strmux_eth;
92 else
93 panic("Invalid DMA channel for eth\n");
94 break;
95 case dma_ser0:
96 if (dmanr == 0)
97 strmux_cfg.dma0 = regk_strmux_ser0;
98 else if (dmanr == 1)
99 strmux_cfg.dma1 = regk_strmux_ser0;
100 else
101 panic("Invalid DMA channel for ser0\n");
102 break;
103 case dma_ser3:
104 if (dmanr == 2)
105 strmux_cfg.dma2 = regk_strmux_ser3;
106 else if (dmanr == 3)
107 strmux_cfg.dma3 = regk_strmux_ser3;
108 else
109 panic("Invalid DMA channel for ser3\n");
110 break;
111 case dma_strp:
112 if (dmanr == 2)
113 strmux_cfg.dma2 = regk_strmux_strcop;
114 else if (dmanr == 3)
115 strmux_cfg.dma3 = regk_strmux_strcop;
116 else
117 panic("Invalid DMA channel for strp\n");
118 break;
119 case dma_ser1:
120 if (dmanr == 4)
121 strmux_cfg.dma4 = regk_strmux_ser1;
122 else if (dmanr == 5)
123 strmux_cfg.dma5 = regk_strmux_ser1;
124 else
125 panic("Invalid DMA channel for ser1\n");
126 break;
127 case dma_iop:
128 if (dmanr == 4)
129 strmux_cfg.dma4 = regk_strmux_iop;
130 else if (dmanr == 5)
131 strmux_cfg.dma5 = regk_strmux_iop;
132 else
133 panic("Invalid DMA channel for iop\n");
134 break;
135 case dma_ser2:
136 if (dmanr == 6)
137 strmux_cfg.dma6 = regk_strmux_ser2;
138 else if (dmanr == 7)
139 strmux_cfg.dma7 = regk_strmux_ser2;
140 else
141 panic("Invalid DMA channel for ser2\n");
142 break;
143 case dma_sser:
144 if (dmanr == 6)
145 strmux_cfg.dma6 = regk_strmux_sser;
146 else if (dmanr == 7)
147 strmux_cfg.dma7 = regk_strmux_sser;
148 else
149 panic("Invalid DMA channel for sser\n");
150 break;
151 case dma_ser4:
152 if (dmanr == 9)
153 strmux_cfg.dma9 = regk_strmux_ser4;
154 else
155 panic("Invalid DMA channel for ser4\n");
156 break;
157 case dma_jpeg:
158 if (dmanr == 9)
159 strmux_cfg.dma9 = regk_strmux_jpeg;
160 else
161 panic("Invalid DMA channel for JPEG\n");
162 break;
163 case dma_h264:
164 if (dmanr == 11)
165 strmux_cfg.dma11 = regk_strmux_h264;
166 else
167 panic("Invalid DMA channel for H264\n");
168 break;
169 }
170
171 used_dma_channels[dmanr] = 1;
172 used_dma_channels_users[dmanr] = device_id;
173 REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
174 REG_WR(strmux, regi_strmux, rw_cfg, strmux_cfg);
175 spin_unlock_irqrestore(&dma_lock, flags);
176 return 0;
177}
178
179void crisv32_free_dma(unsigned int dmanr)
180{
181 spin_lock(&dma_lock);
182 used_dma_channels[dmanr] = 0;
183 spin_unlock(&dma_lock);
184}