File: /usr/src/linux/include/asm-sparc64/parport.h
1 /* $Id: parport.h,v 1.11 2001/05/11 07:54:24 davem Exp $
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 <asm/ebus.h>
11 #include <asm/isa.h>
12 #include <asm/ns87303.h>
13
14 #define PARPORT_PC_MAX_PORTS PARPORT_MAX
15
16 static struct linux_ebus_dma *sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
17
18 static __inline__ void
19 reset_dma(unsigned int dmanr)
20 {
21 unsigned int dcsr;
22
23 writel(EBUS_DCSR_RESET, &sparc_ebus_dmas[dmanr]->dcsr);
24 udelay(1);
25 dcsr = EBUS_DCSR_BURST_SZ_16 | EBUS_DCSR_TCI_DIS |
26 EBUS_DCSR_EN_CNT | EBUS_DCSR_INT_EN;
27 writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
28 }
29
30 static __inline__ void
31 enable_dma(unsigned int dmanr)
32 {
33 unsigned int dcsr;
34
35 dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
36 dcsr |= EBUS_DCSR_EN_DMA;
37 writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
38 }
39
40 static __inline__ void
41 disable_dma(unsigned int dmanr)
42 {
43 unsigned int dcsr;
44
45 dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
46 if (dcsr & EBUS_DCSR_EN_DMA) {
47 while (dcsr & EBUS_DCSR_DRAIN) {
48 udelay(1);
49 dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
50 }
51 dcsr &= ~(EBUS_DCSR_EN_DMA);
52 writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
53
54 dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
55 if (dcsr & EBUS_DCSR_ERR_PEND)
56 reset_dma(dmanr);
57 }
58 }
59
60 static __inline__ void
61 clear_dma_ff(unsigned int dmanr)
62 {
63 /* nothing */
64 }
65
66 static __inline__ void
67 set_dma_mode(unsigned int dmanr, char mode)
68 {
69 unsigned int dcsr;
70
71 dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
72 dcsr |= EBUS_DCSR_EN_CNT | EBUS_DCSR_TC;
73 if (mode == DMA_MODE_WRITE)
74 dcsr &= ~(EBUS_DCSR_WRITE);
75 else
76 dcsr |= EBUS_DCSR_WRITE;
77 writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
78 }
79
80 static __inline__ void
81 set_dma_addr(unsigned int dmanr, unsigned int addr)
82 {
83 writel(addr, &sparc_ebus_dmas[dmanr]->dacr);
84 }
85
86 static __inline__ void
87 set_dma_count(unsigned int dmanr, unsigned int count)
88 {
89 writel(count, &sparc_ebus_dmas[dmanr]->dbcr);
90 }
91
92 static __inline__ int
93 get_dma_residue(unsigned int dmanr)
94 {
95 int res;
96
97 res = readl(&sparc_ebus_dmas[dmanr]->dbcr);
98 if (res != 0)
99 reset_dma(dmanr);
100 return res;
101 }
102
103 static int ebus_ecpp_p(struct linux_ebus_device *edev)
104 {
105 if (!strcmp(edev->prom_name, "ecpp"))
106 return 1;
107 if (!strcmp(edev->prom_name, "parallel")) {
108 char compat[19];
109 prom_getstring(edev->prom_node,
110 "compatible",
111 compat, sizeof(compat));
112 compat[18] = '\0';
113 if (!strcmp(compat, "ecpp"))
114 return 1;
115 if (!strcmp(compat, "ns87317-ecpp") &&
116 !strcmp(compat + 13, "ecpp"))
117 return 1;
118 }
119 return 0;
120 }
121
122 static int parport_isa_probe(int count)
123 {
124 struct isa_bridge *isa_br;
125 struct isa_device *isa_dev;
126
127 for_each_isa(isa_br) {
128 for_each_isadev(isa_dev, isa_br) {
129 struct isa_device *child;
130 unsigned long base;
131
132 if (strcmp(isa_dev->prom_name, "dma"))
133 continue;
134
135 child = isa_dev->child;
136 while (child) {
137 if (!strcmp(child->prom_name, "parallel"))
138 break;
139 child = child->next;
140 }
141 if (!child)
142 continue;
143
144 base = child->resource.start;
145
146 /* No DMA, see commentary in
147 * asm-sparc64/floppy.h:isa_floppy_init()
148 */
149 if (parport_pc_probe_port(base, base + 0x400,
150 child->irq, PARPORT_DMA_NOFIFO,
151 child->bus->self))
152 count++;
153 }
154 }
155
156 return count;
157 }
158
159 static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
160 {
161 struct linux_ebus *ebus;
162 struct linux_ebus_device *edev;
163 int count = 0;
164
165 if (!pci_present())
166 return 0;
167
168 for_each_ebus(ebus) {
169 for_each_ebusdev(edev, ebus) {
170 if (ebus_ecpp_p(edev)) {
171 unsigned long base = edev->resource[0].start;
172 unsigned long config = edev->resource[1].start;
173
174 sparc_ebus_dmas[count] =
175 (struct linux_ebus_dma *)
176 edev->resource[2].start;
177 reset_dma(count);
178
179 /* Configure IRQ to Push Pull, Level Low */
180 /* Enable ECP, set bit 2 of the CTR first */
181 outb(0x04, base + 0x02);
182 ns87303_modify(config, PCR,
183 PCR_EPP_ENABLE |
184 PCR_IRQ_ODRAIN,
185 PCR_ECP_ENABLE |
186 PCR_ECP_CLK_ENA |
187 PCR_IRQ_POLAR);
188
189 /* CTR bit 5 controls direction of port */
190 ns87303_modify(config, PTR,
191 0, PTR_LPT_REG_DIR);
192
193 if (parport_pc_probe_port(base, base + 0x400,
194 edev->irqs[0],
195 count, ebus->self))
196 count++;
197 }
198 }
199 }
200
201 count = parport_isa_probe(count);
202
203 return count;
204 }
205
206 #endif /* !(_ASM_SPARC64_PARPORT_H */
207