Merge branch 'drm-patches' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[linux-2.6] / include / asm-sparc64 / 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 <asm/ebus.h>
10 #include <asm/ns87303.h>
11 #include <asm/of_device.h>
12 #include <asm/prom.h>
13
14 #define PARPORT_PC_MAX_PORTS    PARPORT_MAX
15
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
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
33 static struct sparc_ebus_info {
34         struct ebus_dma_info info;
35         unsigned int addr;
36         unsigned int count;
37         int lock;
38
39         struct parport *port;
40 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
41
42 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
43
44 static inline int request_dma(unsigned int dmanr, const char *device_id)
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
53 static inline void free_dma(unsigned int dmanr)
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
65 static inline void enable_dma(unsigned int dmanr)
66 {
67         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
68
69         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
70                              sparc_ebus_dmas[dmanr].addr,
71                              sparc_ebus_dmas[dmanr].count))
72                 BUG();
73 }
74
75 static inline void disable_dma(unsigned int dmanr)
76 {
77         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
78 }
79
80 static inline void clear_dma_ff(unsigned int dmanr)
81 {
82         /* nothing */
83 }
84
85 static inline void set_dma_mode(unsigned int dmanr, char mode)
86 {
87         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
88 }
89
90 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
91 {
92         sparc_ebus_dmas[dmanr].addr = addr;
93 }
94
95 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
96 {
97         sparc_ebus_dmas[dmanr].count = count;
98 }
99
100 static inline unsigned int get_dma_residue(unsigned int dmanr)
101 {
102         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
103 }
104
105 static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match)
106 {
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,
119                                           op->dev.parent->parent);
120                 if (!p)
121                         return -ENOMEM;
122                 dev_set_drvdata(&op->dev, p);
123                 return 0;
124         }
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
177         return 0;
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;
191 }
192
193 static int __devexit ecpp_remove(struct of_device *op)
194 {
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);
212         }
213
214         return 0;
215 }
216
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)
240 {
241         of_register_driver(&ecpp_driver, &of_bus_type);
242
243         return 0;
244 }
245
246 #endif /* !(_ASM_SPARC64_PARPORT_H */