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
 26static 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
 38static 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
 47static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
 48
 49static 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
 58static 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
 70static 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
 80static inline void disable_dma(unsigned int dmanr)
 81{
 82	ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
 83}
 84
 85static inline void clear_dma_ff(unsigned int dmanr)
 86{
 87	/* nothing */
 88}
 89
 90static 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
 95static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
 96{
 97	sparc_ebus_dmas[dmanr].addr = addr;
 98}
 99
100static inline void set_dma_count(unsigned int dmanr, unsigned int count)
101{
102	sparc_ebus_dmas[dmanr].count = count;
103}
104
105static inline unsigned int get_dma_residue(unsigned int dmanr)
106{
107	return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
108}
109
110static 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
185out_disable_irq:
186	ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
187	ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
188
189out_unmap_regs:
190	of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
191
192out_clear_map:
193	clear_bit(slot, dma_slot_map);
194
195out_err:
196	return err;
197}
198
199static 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
221static 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
240static struct platform_driver ecpp_driver = {
241	.driver = {
242		.name = "ecpp",
243		.of_match_table = ecpp_match,
244	},
245	.probe			= ecpp_probe,
246	.remove			= ecpp_remove,
247};
248
249static 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 */