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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_dma.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
23static 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
34static 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
43static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
44
45static 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
54static 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
66static 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
76static inline void disable_dma(unsigned int dmanr)
77{
78 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
79}
80
81static inline void clear_dma_ff(unsigned int dmanr)
82{
83 /* nothing */
84}
85
86static 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
91static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
92{
93 sparc_ebus_dmas[dmanr].addr = addr;
94}
95
96static inline void set_dma_count(unsigned int dmanr, unsigned int count)
97{
98 sparc_ebus_dmas[dmanr].count = count;
99}
100
101static inline unsigned int get_dma_residue(unsigned int dmanr)
102{
103 return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
104}
105
106static int __devinit ecpp_probe(struct platform_device *op)
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->dev.of_node->parent;
117 if (!strcmp(parent->name, "dma")) {
118 p = parport_pc_probe_port(base, base + 0x400,
119 op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
120 op->dev.parent->parent, 0);
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->archdata.irqs[0],
170 slot,
171 op->dev.parent,
172 0);
173 err = -ENOMEM;
174 if (!p)
175 goto out_disable_irq;
176
177 dev_set_drvdata(&op->dev, p);
178
179 return 0;
180
181out_disable_irq:
182 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
183 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
184
185out_unmap_regs:
186 of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
187
188out_clear_map:
189 clear_bit(slot, dma_slot_map);
190
191out_err:
192 return err;
193}
194
195static int __devexit ecpp_remove(struct platform_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
219static const struct of_device_id ecpp_match[] = {
220 {
221 .name = "ecpp",
222 },
223 {
224 .name = "parallel",
225 .compatible = "ecpp",
226 },
227 {
228 .name = "parallel",
229 .compatible = "ns87317-ecpp",
230 },
231 {
232 .name = "parallel",
233 .compatible = "pnpALI,1533,3",
234 },
235 {},
236};
237
238static struct platform_driver ecpp_driver = {
239 .driver = {
240 .name = "ecpp",
241 .owner = THIS_MODULE,
242 .of_match_table = ecpp_match,
243 },
244 .probe = ecpp_probe,
245 .remove = __devexit_p(ecpp_remove),
246};
247
248static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
249{
250 return platform_driver_register(&ecpp_driver);
251}
252
253#endif /* !(_ASM_SPARC64_PARPORT_H */