d9830621c906bb67dae70ebc65eed5addd0f4bff
[linux-2.6.git] / arch / sparc / include / asm / parport.h
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
9 #include <linux/of_device.h>
10
11 #include <asm/ebus.h>
12 #include <asm/ns87303.h>
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
116         parent = op->node->parent;
117         if (!strcmp(parent->name, "dma")) {
118                 p = parport_pc_probe_port(base, base + 0x400,
119                                           op->irqs[0], PARPORT_DMA_NOFIFO,
120                                           op->dev.parent->parent);
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,
171                                   op->dev.parent);
172         err = -ENOMEM;
173         if (!p)
174                 goto out_disable_irq;
175
176         dev_set_drvdata(&op->dev, p);
177
178         return 0;
179
180 out_disable_irq:
181         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
182         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
183
184 out_unmap_regs:
185         of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
186
187 out_clear_map:
188         clear_bit(slot, dma_slot_map);
189
190 out_err:
191         return err;
192 }
193
194 static int __devexit ecpp_remove(struct of_device *op)
195 {
196         struct parport *p = dev_get_drvdata(&op->dev);
197         int slot = p->dma;
198
199         parport_pc_unregister_port(p);
200
201         if (slot != PARPORT_DMA_NOFIFO) {
202                 unsigned long d_base = op->resource[2].start;
203                 unsigned long d_len;
204
205                 d_len = (op->resource[2].end - d_base) + 1UL;
206
207                 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
208                 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
209                 of_iounmap(&op->resource[2],
210                            sparc_ebus_dmas[slot].info.regs,
211                            d_len);
212                 clear_bit(slot, dma_slot_map);
213         }
214
215         return 0;
216 }
217
218 static struct of_device_id ecpp_match[] = {
219         {
220                 .name = "ecpp",
221         },
222         {
223                 .name = "parallel",
224                 .compatible = "ecpp",
225         },
226         {
227                 .name = "parallel",
228                 .compatible = "ns87317-ecpp",
229         },
230         {},
231 };
232
233 static struct of_platform_driver ecpp_driver = {
234         .name                   = "ecpp",
235         .match_table            = ecpp_match,
236         .probe                  = ecpp_probe,
237         .remove                 = __devexit_p(ecpp_remove),
238 };
239
240 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
241 {
242         of_register_driver(&ecpp_driver, &of_bus_type);
243
244         return 0;
245 }
246
247 #endif /* !(_ASM_SPARC64_PARPORT_H */