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a00736e9 SR |
1 | /* parport.h: sparc64 specific parport initialization and dma. |
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 | ||
764f2579 SR |
9 | #include <linux/of_device.h> |
10 | ||
aae7fb87 | 11 | #include <asm/ebus_dma.h> |
a00736e9 | 12 | #include <asm/ns87303.h> |
a00736e9 SR |
13 | #include <asm/prom.h> |
14 | ||
15 | #define PARPORT_PC_MAX_PORTS PARPORT_MAX | |
16 | ||
17 | /* | |
18 | * While sparc64 doesn't have an ISA DMA API, we provide something that looks | |
19 | * close enough to make parport_pc happy | |
20 | */ | |
21 | #define HAS_DMA | |
22 | ||
23 | static DEFINE_SPINLOCK(dma_spin_lock); | |
24 | ||
25 | #define claim_dma_lock() \ | |
26 | ({ unsigned long flags; \ | |
27 | spin_lock_irqsave(&dma_spin_lock, flags); \ | |
28 | flags; \ | |
29 | }) | |
30 | ||
31 | #define release_dma_lock(__flags) \ | |
32 | spin_unlock_irqrestore(&dma_spin_lock, __flags); | |
33 | ||
34 | static struct sparc_ebus_info { | |
35 | struct ebus_dma_info info; | |
36 | unsigned int addr; | |
37 | unsigned int count; | |
38 | int lock; | |
39 | ||
40 | struct parport *port; | |
41 | } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS]; | |
42 | ||
43 | static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS); | |
44 | ||
45 | static inline int request_dma(unsigned int dmanr, const char *device_id) | |
46 | { | |
47 | if (dmanr >= PARPORT_PC_MAX_PORTS) | |
48 | return -EINVAL; | |
49 | if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0) | |
50 | return -EBUSY; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static inline void free_dma(unsigned int dmanr) | |
55 | { | |
56 | if (dmanr >= PARPORT_PC_MAX_PORTS) { | |
57 | printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); | |
58 | return; | |
59 | } | |
60 | if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) { | |
61 | printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); | |
62 | return; | |
63 | } | |
64 | } | |
65 | ||
66 | static inline void enable_dma(unsigned int dmanr) | |
67 | { | |
68 | ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1); | |
69 | ||
70 | if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info, | |
71 | sparc_ebus_dmas[dmanr].addr, | |
72 | sparc_ebus_dmas[dmanr].count)) | |
73 | BUG(); | |
74 | } | |
75 | ||
76 | static inline void disable_dma(unsigned int dmanr) | |
77 | { | |
78 | ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0); | |
79 | } | |
80 | ||
81 | static inline void clear_dma_ff(unsigned int dmanr) | |
82 | { | |
83 | /* nothing */ | |
84 | } | |
85 | ||
86 | static inline void set_dma_mode(unsigned int dmanr, char mode) | |
87 | { | |
88 | ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE)); | |
89 | } | |
90 | ||
91 | static inline void set_dma_addr(unsigned int dmanr, unsigned int addr) | |
92 | { | |
93 | sparc_ebus_dmas[dmanr].addr = addr; | |
94 | } | |
95 | ||
96 | static inline void set_dma_count(unsigned int dmanr, unsigned int count) | |
97 | { | |
98 | sparc_ebus_dmas[dmanr].count = count; | |
99 | } | |
100 | ||
101 | static inline unsigned int get_dma_residue(unsigned int dmanr) | |
102 | { | |
103 | return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info); | |
104 | } | |
105 | ||
106 | static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match) | |
107 | { | |
108 | unsigned long base = op->resource[0].start; | |
109 | unsigned long config = op->resource[1].start; | |
110 | unsigned long d_base = op->resource[2].start; | |
111 | unsigned long d_len; | |
112 | struct device_node *parent; | |
113 | struct parport *p; | |
114 | int slot, err; | |
115 | ||
61c7a080 | 116 | parent = op->dev.of_node->parent; |
a00736e9 SR |
117 | if (!strcmp(parent->name, "dma")) { |
118 | p = parport_pc_probe_port(base, base + 0x400, | |
119 | op->irqs[0], PARPORT_DMA_NOFIFO, | |
28783eb5 | 120 | op->dev.parent->parent, 0); |
a00736e9 SR |
121 | if (!p) |
122 | return -ENOMEM; | |
123 | dev_set_drvdata(&op->dev, p); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) { | |
128 | if (!test_and_set_bit(slot, dma_slot_map)) | |
129 | break; | |
130 | } | |
131 | err = -ENODEV; | |
132 | if (slot >= PARPORT_PC_MAX_PORTS) | |
133 | goto out_err; | |
134 | ||
135 | spin_lock_init(&sparc_ebus_dmas[slot].info.lock); | |
136 | ||
137 | d_len = (op->resource[2].end - d_base) + 1UL; | |
138 | sparc_ebus_dmas[slot].info.regs = | |
139 | of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA"); | |
140 | ||
141 | if (!sparc_ebus_dmas[slot].info.regs) | |
142 | goto out_clear_map; | |
143 | ||
144 | sparc_ebus_dmas[slot].info.flags = 0; | |
145 | sparc_ebus_dmas[slot].info.callback = NULL; | |
146 | sparc_ebus_dmas[slot].info.client_cookie = NULL; | |
147 | sparc_ebus_dmas[slot].info.irq = 0xdeadbeef; | |
148 | strcpy(sparc_ebus_dmas[slot].info.name, "parport"); | |
149 | if (ebus_dma_register(&sparc_ebus_dmas[slot].info)) | |
150 | goto out_unmap_regs; | |
151 | ||
152 | ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1); | |
153 | ||
154 | /* Configure IRQ to Push Pull, Level Low */ | |
155 | /* Enable ECP, set bit 2 of the CTR first */ | |
156 | outb(0x04, base + 0x02); | |
157 | ns87303_modify(config, PCR, | |
158 | PCR_EPP_ENABLE | | |
159 | PCR_IRQ_ODRAIN, | |
160 | PCR_ECP_ENABLE | | |
161 | PCR_ECP_CLK_ENA | | |
162 | PCR_IRQ_POLAR); | |
163 | ||
164 | /* CTR bit 5 controls direction of port */ | |
165 | ns87303_modify(config, PTR, | |
166 | 0, PTR_LPT_REG_DIR); | |
167 | ||
168 | p = parport_pc_probe_port(base, base + 0x400, | |
169 | op->irqs[0], | |
170 | slot, | |
28783eb5 AC |
171 | op->dev.parent, |
172 | 0); | |
a00736e9 SR |
173 | err = -ENOMEM; |
174 | if (!p) | |
175 | goto out_disable_irq; | |
176 | ||
177 | dev_set_drvdata(&op->dev, p); | |
178 | ||
179 | return 0; | |
180 | ||
181 | out_disable_irq: | |
182 | ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); | |
183 | ebus_dma_unregister(&sparc_ebus_dmas[slot].info); | |
184 | ||
185 | out_unmap_regs: | |
186 | of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len); | |
187 | ||
188 | out_clear_map: | |
189 | clear_bit(slot, dma_slot_map); | |
190 | ||
191 | out_err: | |
192 | return err; | |
193 | } | |
194 | ||
195 | static int __devexit ecpp_remove(struct of_device *op) | |
196 | { | |
197 | struct parport *p = dev_get_drvdata(&op->dev); | |
198 | int slot = p->dma; | |
199 | ||
200 | parport_pc_unregister_port(p); | |
201 | ||
202 | if (slot != PARPORT_DMA_NOFIFO) { | |
203 | unsigned long d_base = op->resource[2].start; | |
204 | unsigned long d_len; | |
205 | ||
206 | d_len = (op->resource[2].end - d_base) + 1UL; | |
207 | ||
208 | ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); | |
209 | ebus_dma_unregister(&sparc_ebus_dmas[slot].info); | |
210 | of_iounmap(&op->resource[2], | |
211 | sparc_ebus_dmas[slot].info.regs, | |
212 | d_len); | |
213 | clear_bit(slot, dma_slot_map); | |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
fd098316 | 219 | static const struct of_device_id ecpp_match[] = { |
a00736e9 SR |
220 | { |
221 | .name = "ecpp", | |
222 | }, | |
223 | { | |
224 | .name = "parallel", | |
225 | .compatible = "ecpp", | |
226 | }, | |
227 | { | |
228 | .name = "parallel", | |
229 | .compatible = "ns87317-ecpp", | |
230 | }, | |
231 | {}, | |
232 | }; | |
233 | ||
234 | static struct of_platform_driver ecpp_driver = { | |
235 | .name = "ecpp", | |
236 | .match_table = ecpp_match, | |
237 | .probe = ecpp_probe, | |
238 | .remove = __devexit_p(ecpp_remove), | |
239 | }; | |
240 | ||
241 | static int parport_pc_find_nonpci_ports(int autoirq, int autodma) | |
242 | { | |
243 | of_register_driver(&ecpp_driver, &of_bus_type); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | #endif /* !(_ASM_SPARC64_PARPORT_H */ |