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 int 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 	return 0;
221 }
222 
223 static const struct of_device_id ecpp_match[] = {
224 	{
225 		.name = "ecpp",
226 	},
227 	{
228 		.name = "parallel",
229 		.compatible = "ecpp",
230 	},
231 	{
232 		.name = "parallel",
233 		.compatible = "ns87317-ecpp",
234 	},
235 	{
236 		.name = "parallel",
237 		.compatible = "pnpALI,1533,3",
238 	},
239 	{},
240 };
241 
242 static struct platform_driver ecpp_driver = {
243 	.driver = {
244 		.name = "ecpp",
245 		.of_match_table = ecpp_match,
246 	},
247 	.probe			= ecpp_probe,
248 	.remove			= ecpp_remove,
249 };
250 
251 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
252 {
253 	return platform_driver_register(&ecpp_driver);
254 }
255 
256 #endif /* !(_ASM_SPARC64_PARPORT_H */
257