Commit | Line | Data |
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d979f179 | 1 | /* parport.h: sparc64 specific parport initialization and dma. |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1999 Eddie C. Dost (ecd@skynet.be) | |
4 | */ | |
5 | ||
6 | #ifndef _ASM_SPARC64_PARPORT_H | |
7 | #define _ASM_SPARC64_PARPORT_H 1 | |
8 | ||
9 | #include <asm/ebus.h> | |
1da177e4 | 10 | #include <asm/ns87303.h> |
0fe85d50 DM |
11 | #include <asm/of_device.h> |
12 | #include <asm/prom.h> | |
1da177e4 LT |
13 | |
14 | #define PARPORT_PC_MAX_PORTS PARPORT_MAX | |
15 | ||
7fbacd52 AV |
16 | /* |
17 | * While sparc64 doesn't have an ISA DMA API, we provide something that looks | |
18 | * close enough to make parport_pc happy | |
19 | */ | |
20 | #define HAS_DMA | |
21 | ||
2ef55079 DM |
22 | static DEFINE_SPINLOCK(dma_spin_lock); |
23 | ||
24 | #define claim_dma_lock() \ | |
25 | ({ unsigned long flags; \ | |
26 | spin_lock_irqsave(&dma_spin_lock, flags); \ | |
27 | flags; \ | |
28 | }) | |
29 | ||
30 | #define release_dma_lock(__flags) \ | |
31 | spin_unlock_irqrestore(&dma_spin_lock, __flags); | |
32 | ||
1da177e4 LT |
33 | static struct sparc_ebus_info { |
34 | struct ebus_dma_info info; | |
35 | unsigned int addr; | |
36 | unsigned int count; | |
74bd7d09 | 37 | int lock; |
0fe85d50 DM |
38 | |
39 | struct parport *port; | |
1da177e4 LT |
40 | } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS]; |
41 | ||
0fe85d50 DM |
42 | static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS); |
43 | ||
d979f179 | 44 | static inline int request_dma(unsigned int dmanr, const char *device_id) |
74bd7d09 DM |
45 | { |
46 | if (dmanr >= PARPORT_PC_MAX_PORTS) | |
47 | return -EINVAL; | |
48 | if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0) | |
49 | return -EBUSY; | |
50 | return 0; | |
51 | } | |
52 | ||
d979f179 | 53 | static inline void free_dma(unsigned int dmanr) |
74bd7d09 DM |
54 | { |
55 | if (dmanr >= PARPORT_PC_MAX_PORTS) { | |
56 | printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); | |
57 | return; | |
58 | } | |
59 | if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) { | |
60 | printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); | |
61 | return; | |
62 | } | |
63 | } | |
64 | ||
d979f179 | 65 | static inline void enable_dma(unsigned int dmanr) |
1da177e4 | 66 | { |
e3e01d60 ED |
67 | ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1); |
68 | ||
1da177e4 LT |
69 | if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info, |
70 | sparc_ebus_dmas[dmanr].addr, | |
71 | sparc_ebus_dmas[dmanr].count)) | |
72 | BUG(); | |
1da177e4 LT |
73 | } |
74 | ||
d979f179 | 75 | static inline void disable_dma(unsigned int dmanr) |
1da177e4 LT |
76 | { |
77 | ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0); | |
78 | } | |
79 | ||
d979f179 | 80 | static inline void clear_dma_ff(unsigned int dmanr) |
1da177e4 LT |
81 | { |
82 | /* nothing */ | |
83 | } | |
84 | ||
d979f179 | 85 | static inline void set_dma_mode(unsigned int dmanr, char mode) |
1da177e4 LT |
86 | { |
87 | ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE)); | |
88 | } | |
89 | ||
d979f179 | 90 | static inline void set_dma_addr(unsigned int dmanr, unsigned int addr) |
1da177e4 LT |
91 | { |
92 | sparc_ebus_dmas[dmanr].addr = addr; | |
93 | } | |
94 | ||
d979f179 | 95 | static inline void set_dma_count(unsigned int dmanr, unsigned int count) |
1da177e4 LT |
96 | { |
97 | sparc_ebus_dmas[dmanr].count = count; | |
98 | } | |
99 | ||
d979f179 | 100 | static inline unsigned int get_dma_residue(unsigned int dmanr) |
1da177e4 LT |
101 | { |
102 | return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info); | |
103 | } | |
104 | ||
0fe85d50 | 105 | static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match) |
1da177e4 | 106 | { |
0fe85d50 DM |
107 | unsigned long base = op->resource[0].start; |
108 | unsigned long config = op->resource[1].start; | |
109 | unsigned long d_base = op->resource[2].start; | |
110 | unsigned long d_len; | |
111 | struct device_node *parent; | |
112 | struct parport *p; | |
113 | int slot, err; | |
114 | ||
115 | parent = op->node->parent; | |
116 | if (!strcmp(parent->name, "dma")) { | |
117 | p = parport_pc_probe_port(base, base + 0x400, | |
118 | op->irqs[0], PARPORT_DMA_NOFIFO, | |
ad7ad57c | 119 | op->dev.parent->parent); |
0fe85d50 DM |
120 | if (!p) |
121 | return -ENOMEM; | |
122 | dev_set_drvdata(&op->dev, p); | |
123 | return 0; | |
1da177e4 | 124 | } |
0fe85d50 DM |
125 | |
126 | for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) { | |
127 | if (!test_and_set_bit(slot, dma_slot_map)) | |
128 | break; | |
129 | } | |
130 | err = -ENODEV; | |
131 | if (slot >= PARPORT_PC_MAX_PORTS) | |
132 | goto out_err; | |
133 | ||
134 | spin_lock_init(&sparc_ebus_dmas[slot].info.lock); | |
135 | ||
136 | d_len = (op->resource[2].end - d_base) + 1UL; | |
137 | sparc_ebus_dmas[slot].info.regs = | |
138 | of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA"); | |
139 | ||
140 | if (!sparc_ebus_dmas[slot].info.regs) | |
141 | goto out_clear_map; | |
142 | ||
143 | sparc_ebus_dmas[slot].info.flags = 0; | |
144 | sparc_ebus_dmas[slot].info.callback = NULL; | |
145 | sparc_ebus_dmas[slot].info.client_cookie = NULL; | |
146 | sparc_ebus_dmas[slot].info.irq = 0xdeadbeef; | |
147 | strcpy(sparc_ebus_dmas[slot].info.name, "parport"); | |
148 | if (ebus_dma_register(&sparc_ebus_dmas[slot].info)) | |
149 | goto out_unmap_regs; | |
150 | ||
151 | ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1); | |
152 | ||
153 | /* Configure IRQ to Push Pull, Level Low */ | |
154 | /* Enable ECP, set bit 2 of the CTR first */ | |
155 | outb(0x04, base + 0x02); | |
156 | ns87303_modify(config, PCR, | |
157 | PCR_EPP_ENABLE | | |
158 | PCR_IRQ_ODRAIN, | |
159 | PCR_ECP_ENABLE | | |
160 | PCR_ECP_CLK_ENA | | |
161 | PCR_IRQ_POLAR); | |
162 | ||
163 | /* CTR bit 5 controls direction of port */ | |
164 | ns87303_modify(config, PTR, | |
165 | 0, PTR_LPT_REG_DIR); | |
166 | ||
167 | p = parport_pc_probe_port(base, base + 0x400, | |
168 | op->irqs[0], | |
169 | slot, | |
170 | op->dev.parent); | |
171 | err = -ENOMEM; | |
172 | if (!p) | |
173 | goto out_disable_irq; | |
174 | ||
175 | dev_set_drvdata(&op->dev, p); | |
176 | ||
1da177e4 | 177 | return 0; |
0fe85d50 DM |
178 | |
179 | out_disable_irq: | |
180 | ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); | |
181 | ebus_dma_unregister(&sparc_ebus_dmas[slot].info); | |
182 | ||
183 | out_unmap_regs: | |
184 | of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len); | |
185 | ||
186 | out_clear_map: | |
187 | clear_bit(slot, dma_slot_map); | |
188 | ||
189 | out_err: | |
190 | return err; | |
1da177e4 LT |
191 | } |
192 | ||
0fe85d50 | 193 | static int __devexit ecpp_remove(struct of_device *op) |
1da177e4 | 194 | { |
0fe85d50 DM |
195 | struct parport *p = dev_get_drvdata(&op->dev); |
196 | int slot = p->dma; | |
197 | ||
198 | parport_pc_unregister_port(p); | |
199 | ||
200 | if (slot != PARPORT_DMA_NOFIFO) { | |
201 | unsigned long d_base = op->resource[2].start; | |
202 | unsigned long d_len; | |
203 | ||
204 | d_len = (op->resource[2].end - d_base) + 1UL; | |
205 | ||
206 | ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); | |
207 | ebus_dma_unregister(&sparc_ebus_dmas[slot].info); | |
208 | of_iounmap(&op->resource[2], | |
209 | sparc_ebus_dmas[slot].info.regs, | |
210 | d_len); | |
211 | clear_bit(slot, dma_slot_map); | |
1da177e4 LT |
212 | } |
213 | ||
0fe85d50 | 214 | return 0; |
1da177e4 LT |
215 | } |
216 | ||
0fe85d50 DM |
217 | static struct of_device_id ecpp_match[] = { |
218 | { | |
219 | .name = "ecpp", | |
220 | }, | |
221 | { | |
222 | .name = "parallel", | |
223 | .compatible = "ecpp", | |
224 | }, | |
225 | { | |
226 | .name = "parallel", | |
227 | .compatible = "ns87317-ecpp", | |
228 | }, | |
229 | {}, | |
230 | }; | |
231 | ||
232 | static struct of_platform_driver ecpp_driver = { | |
233 | .name = "ecpp", | |
234 | .match_table = ecpp_match, | |
235 | .probe = ecpp_probe, | |
236 | .remove = __devexit_p(ecpp_remove), | |
237 | }; | |
238 | ||
239 | static int parport_pc_find_nonpci_ports(int autoirq, int autodma) | |
1da177e4 | 240 | { |
0fe85d50 | 241 | of_register_driver(&ecpp_driver, &of_bus_type); |
1da177e4 | 242 | |
0fe85d50 | 243 | return 0; |
1da177e4 LT |
244 | } |
245 | ||
246 | #endif /* !(_ASM_SPARC64_PARPORT_H */ |