1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* parport.h: sparc64 specific parport initialization and dma.
3 *
4 * Copyright (C) 1999 Eddie C. Dost (ecd@skynet.be)
5 */
6
7 #ifndef _ASM_SPARC64_PARPORT_H
8 #define _ASM_SPARC64_PARPORT_H 1
9
10 #include <linux/of.h>
11 #include <linux/platform_device.h>
12
13 #include <asm/ebus_dma.h>
14 #include <asm/ns87303.h>
15 #include <asm/prom.h>
16
17 #define PARPORT_PC_MAX_PORTS PARPORT_MAX
18
19 /*
20 * While sparc64 doesn't have an ISA DMA API, we provide something that looks
21 * close enough to make parport_pc happy
22 */
23 #define HAS_DMA
24
25 #ifdef CONFIG_PARPORT_PC_FIFO
26 static DEFINE_SPINLOCK(dma_spin_lock);
27
28 #define claim_dma_lock() \
29 ({ unsigned long flags; \
30 spin_lock_irqsave(&dma_spin_lock, flags); \
31 flags; \
32 })
33
34 #define release_dma_lock(__flags) \
35 spin_unlock_irqrestore(&dma_spin_lock, __flags);
36 #endif
37
38 static struct sparc_ebus_info {
39 struct ebus_dma_info info;
40 unsigned int addr;
41 unsigned int count;
42 int lock;
43
44 struct parport *port;
45 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
46
47 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
48
49 static inline int request_dma(unsigned int dmanr, const char *device_id)
50 {
51 if (dmanr >= PARPORT_PC_MAX_PORTS)
52 return -EINVAL;
53 if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
54 return -EBUSY;
55 return 0;
56 }
57
58 static inline void free_dma(unsigned int dmanr)
59 {
60 if (dmanr >= PARPORT_PC_MAX_PORTS) {
61 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
62 return;
63 }
64 if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
65 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
66 return;
67 }
68 }
69
70 static inline void enable_dma(unsigned int dmanr)
71 {
72 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
73
74 if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
75 sparc_ebus_dmas[dmanr].addr,
76 sparc_ebus_dmas[dmanr].count))
77 BUG();
78 }
79
80 static inline void disable_dma(unsigned int dmanr)
81 {
82 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
83 }
84
85 static inline void clear_dma_ff(unsigned int dmanr)
86 {
87 /* nothing */
88 }
89
90 static inline void set_dma_mode(unsigned int dmanr, char mode)
91 {
92 ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
93 }
94
95 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
96 {
97 sparc_ebus_dmas[dmanr].addr = addr;
98 }
99
100 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
101 {
102 sparc_ebus_dmas[dmanr].count = count;
103 }
104
105 static inline unsigned int get_dma_residue(unsigned int dmanr)
106 {
107 return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
108 }
109
110 static int ecpp_probe(struct platform_device *op)
111 {
112 unsigned long base = op->resource[0].start;
113 unsigned long config = op->resource[1].start;
114 unsigned long d_base = op->resource[2].start;
115 unsigned long d_len;
116 struct device_node *parent;
117 struct parport *p;
118 int slot, err;
119
120 parent = op->dev.of_node->parent;
121 if (of_node_name_eq(parent, "dma")) {
122 p = parport_pc_probe_port(base, base + 0x400,
123 op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
124 op->dev.parent->parent, 0);
125 if (!p)
126 return -ENOMEM;
127 dev_set_drvdata(&op->dev, p);
128 return 0;
129 }
130
131 for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
132 if (!test_and_set_bit(slot, dma_slot_map))
133 break;
134 }
135 err = -ENODEV;
136 if (slot >= PARPORT_PC_MAX_PORTS)
137 goto out_err;
138
139 spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
140
141 d_len = (op->resource[2].end - d_base) + 1UL;
142 sparc_ebus_dmas[slot].info.regs =
143 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
144
145 if (!sparc_ebus_dmas[slot].info.regs)
146 goto out_clear_map;
147
148 sparc_ebus_dmas[slot].info.flags = 0;
149 sparc_ebus_dmas[slot].info.callback = NULL;
150 sparc_ebus_dmas[slot].info.client_cookie = NULL;
151 sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
152 strcpy(sparc_ebus_dmas[slot].info.name, "parport");
153 if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
154 goto out_unmap_regs;
155
156 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
157
158 /* Configure IRQ to Push Pull, Level Low */
159 /* Enable ECP, set bit 2 of the CTR first */
160 outb(0x04, base + 0x02);
161 ns87303_modify(config, PCR,
162 PCR_EPP_ENABLE |
163 PCR_IRQ_ODRAIN,
164 PCR_ECP_ENABLE |
165 PCR_ECP_CLK_ENA |
166 PCR_IRQ_POLAR);
167
168 /* CTR bit 5 controls direction of port */
169 ns87303_modify(config, PTR,
170 0, PTR_LPT_REG_DIR);
171
172 p = parport_pc_probe_port(base, base + 0x400,
173 op->archdata.irqs[0],
174 slot,
175 op->dev.parent,
176 0);
177 err = -ENOMEM;
178 if (!p)
179 goto out_disable_irq;
180
181 dev_set_drvdata(&op->dev, p);
182
183 return 0;
184
185 out_disable_irq:
186 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
187 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
188
189 out_unmap_regs:
190 of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
191
192 out_clear_map:
193 clear_bit(slot, dma_slot_map);
194
195 out_err:
196 return err;
197 }
198
199 static void ecpp_remove(struct platform_device *op)
200 {
201 struct parport *p = dev_get_drvdata(&op->dev);
202 int slot = p->dma;
203
204 parport_pc_unregister_port(p);
205
206 if (slot != PARPORT_DMA_NOFIFO) {
207 unsigned long d_base = op->resource[2].start;
208 unsigned long d_len;
209
210 d_len = (op->resource[2].end - d_base) + 1UL;
211
212 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
213 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
214 of_iounmap(&op->resource[2],
215 sparc_ebus_dmas[slot].info.regs,
216 d_len);
217 clear_bit(slot, dma_slot_map);
218 }
219 }
220
221 static const struct of_device_id ecpp_match[] = {
222 {
223 .name = "ecpp",
224 },
225 {
226 .name = "parallel",
227 .compatible = "ecpp",
228 },
229 {
230 .name = "parallel",
231 .compatible = "ns87317-ecpp",
232 },
233 {
234 .name = "parallel",
235 .compatible = "pnpALI,1533,3",
236 },
237 {},
238 };
239
240 static struct platform_driver ecpp_driver = {
241 .driver = {
242 .name = "ecpp",
243 .of_match_table = ecpp_match,
244 },
245 .probe = ecpp_probe,
246 .remove_new = ecpp_remove,
247 };
248
249 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
250 {
251 return platform_driver_register(&ecpp_driver);
252 }
253
254 #endif /* !(_ASM_SPARC64_PARPORT_H */
255
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