1 /*
2 * Architecture specific parts of the Floppy driver
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1995
9 */
10 #ifndef __ASM_POWERPC_FLOPPY_H
11 #define __ASM_POWERPC_FLOPPY_H
12 #ifdef __KERNEL__
13
14 #include <asm/machdep.h>
15
16 #define fd_inb(base, reg) inb_p((base) + (reg))
17 #define fd_outb(value, base, reg) outb_p(value, (base) + (reg))
18
19 #define fd_enable_dma() enable_dma(FLOPPY_DMA)
20 #define fd_disable_dma() fd_ops->_disable_dma(FLOPPY_DMA)
21 #define fd_free_dma() fd_ops->_free_dma(FLOPPY_DMA)
22 #define fd_clear_dma_ff() clear_dma_ff(FLOPPY_DMA)
23 #define fd_set_dma_mode(mode) set_dma_mode(FLOPPY_DMA, mode)
24 #define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA, count)
25 #define fd_get_dma_residue() fd_ops->_get_dma_residue(FLOPPY_DMA)
26 #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
27 #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
28 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);
29
30 #include <linux/pci.h>
31 #include <asm/ppc-pci.h> /* for isa_bridge_pcidev */
32
33 #define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)
34
35 static int fd_request_dma(void);
36
37 struct fd_dma_ops {
38 void (*_disable_dma)(unsigned int dmanr);
39 void (*_free_dma)(unsigned int dmanr);
40 int (*_get_dma_residue)(unsigned int dummy);
41 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
42 };
43
44 static int virtual_dma_count;
45 static int virtual_dma_residue;
46 static char *virtual_dma_addr;
47 static int virtual_dma_mode;
48 static int doing_vdma;
49 static struct fd_dma_ops *fd_ops;
50
51 static irqreturn_t floppy_hardint(int irq, void *dev_id)
52 {
53 unsigned char st;
54 int lcount;
55 char *lptr;
56
57 if (!doing_vdma)
58 return floppy_interrupt(irq, dev_id);
59
60
61 st = 1;
62 for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
63 lcount; lcount--, lptr++) {
64 st = inb(virtual_dma_port + FD_STATUS);
65 st &= STATUS_DMA | STATUS_READY;
66 if (st != (STATUS_DMA | STATUS_READY))
67 break;
68 if (virtual_dma_mode)
69 outb_p(*lptr, virtual_dma_port + FD_DATA);
70 else
71 *lptr = inb_p(virtual_dma_port + FD_DATA);
72 }
73 virtual_dma_count = lcount;
74 virtual_dma_addr = lptr;
75 st = inb(virtual_dma_port + FD_STATUS);
76
77 if (st == STATUS_DMA)
78 return IRQ_HANDLED;
79 if (!(st & STATUS_DMA)) {
80 virtual_dma_residue += virtual_dma_count;
81 virtual_dma_count=0;
82 doing_vdma = 0;
83 floppy_interrupt(irq, dev_id);
84 return IRQ_HANDLED;
85 }
86 return IRQ_HANDLED;
87 }
88
89 static void vdma_disable_dma(unsigned int dummy)
90 {
91 doing_vdma = 0;
92 virtual_dma_residue += virtual_dma_count;
93 virtual_dma_count=0;
94 }
95
96 static void vdma_nop(unsigned int dummy)
97 {
98 }
99
100
101 static int vdma_get_dma_residue(unsigned int dummy)
102 {
103 return virtual_dma_count + virtual_dma_residue;
104 }
105
106
107 static int fd_request_irq(void)
108 {
109 if (can_use_virtual_dma)
110 return request_irq(FLOPPY_IRQ, floppy_hardint,
111 0, "floppy", NULL);
112 else
113 return request_irq(FLOPPY_IRQ, floppy_interrupt,
114 0, "floppy", NULL);
115 }
116
117 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
118 {
119 doing_vdma = 1;
120 virtual_dma_port = io;
121 virtual_dma_mode = (mode == DMA_MODE_WRITE);
122 virtual_dma_addr = addr;
123 virtual_dma_count = size;
124 virtual_dma_residue = 0;
125 return 0;
126 }
127
128 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
129 {
130 static unsigned long prev_size;
131 static dma_addr_t bus_addr = 0;
132 static char *prev_addr;
133 static int prev_dir;
134 int dir;
135
136 doing_vdma = 0;
137 dir = (mode == DMA_MODE_READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
138
139 if (bus_addr
140 && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
141 /* different from last time -- unmap prev */
142 dma_unmap_single(&isa_bridge_pcidev->dev, bus_addr, prev_size,
143 prev_dir);
144 bus_addr = 0;
145 }
146
147 if (!bus_addr) /* need to map it */
148 bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
149 dir);
150
151 /* remember this one as prev */
152 prev_addr = addr;
153 prev_size = size;
154 prev_dir = dir;
155
156 fd_clear_dma_ff();
157 fd_set_dma_mode(mode);
158 set_dma_addr(FLOPPY_DMA, bus_addr);
159 fd_set_dma_count(size);
160 virtual_dma_port = io;
161 fd_enable_dma();
162
163 return 0;
164 }
165
166 static struct fd_dma_ops real_dma_ops =
167 {
168 ._disable_dma = disable_dma,
169 ._free_dma = free_dma,
170 ._get_dma_residue = get_dma_residue,
171 ._dma_setup = hard_dma_setup
172 };
173
174 static struct fd_dma_ops virt_dma_ops =
175 {
176 ._disable_dma = vdma_disable_dma,
177 ._free_dma = vdma_nop,
178 ._get_dma_residue = vdma_get_dma_residue,
179 ._dma_setup = vdma_dma_setup
180 };
181
182 static int fd_request_dma(void)
183 {
184 if (can_use_virtual_dma & 1) {
185 fd_ops = &virt_dma_ops;
186 return 0;
187 }
188 else {
189 fd_ops = &real_dma_ops;
190 return request_dma(FLOPPY_DMA, "floppy");
191 }
192 }
193
194 static int FDC1 = 0x3f0;
195 static int FDC2 = -1;
196
197 /*
198 * Again, the CMOS information not available
199 */
200 #define FLOPPY0_TYPE 6
201 #define FLOPPY1_TYPE 0
202
203 #define N_FDC 2 /* Don't change this! */
204 #define N_DRIVE 8
205
206 /*
207 * The PowerPC has no problems with floppy DMA crossing 64k borders.
208 */
209 #define CROSS_64KB(a,s) (0)
210
211 #define EXTRA_FLOPPY_PARAMS
212
213 #endif /* __KERNEL__ */
214 #endif /* __ASM_POWERPC_FLOPPY_H */
215
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