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(port) inb_p(port)
17 #define fd_outb(value,port) outb_p(value,port)
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
floppy_hardint(int irq,void * dev_id)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+4) & 0xa0 ;
65 if (st != 0xa0)
66 break;
67 if (virtual_dma_mode)
68 outb_p(*lptr, virtual_dma_port+5);
69 else
70 *lptr = inb_p(virtual_dma_port+5);
71 }
72 virtual_dma_count = lcount;
73 virtual_dma_addr = lptr;
74 st = inb(virtual_dma_port+4);
75
76 if (st == 0x20)
77 return IRQ_HANDLED;
78 if (!(st & 0x20)) {
79 virtual_dma_residue += virtual_dma_count;
80 virtual_dma_count=0;
81 doing_vdma = 0;
82 floppy_interrupt(irq, dev_id);
83 return IRQ_HANDLED;
84 }
85 return IRQ_HANDLED;
86 }
87
vdma_disable_dma(unsigned int dummy)88 static void vdma_disable_dma(unsigned int dummy)
89 {
90 doing_vdma = 0;
91 virtual_dma_residue += virtual_dma_count;
92 virtual_dma_count=0;
93 }
94
vdma_nop(unsigned int dummy)95 static void vdma_nop(unsigned int dummy)
96 {
97 }
98
99
vdma_get_dma_residue(unsigned int dummy)100 static int vdma_get_dma_residue(unsigned int dummy)
101 {
102 return virtual_dma_count + virtual_dma_residue;
103 }
104
105
fd_request_irq(void)106 static int fd_request_irq(void)
107 {
108 if (can_use_virtual_dma)
109 return request_irq(FLOPPY_IRQ, floppy_hardint,
110 0, "floppy", NULL);
111 else
112 return request_irq(FLOPPY_IRQ, floppy_interrupt,
113 0, "floppy", NULL);
114 }
115
vdma_dma_setup(char * addr,unsigned long size,int mode,int io)116 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
117 {
118 doing_vdma = 1;
119 virtual_dma_port = io;
120 virtual_dma_mode = (mode == DMA_MODE_WRITE);
121 virtual_dma_addr = addr;
122 virtual_dma_count = size;
123 virtual_dma_residue = 0;
124 return 0;
125 }
126
hard_dma_setup(char * addr,unsigned long size,int mode,int io)127 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
128 {
129 static unsigned long prev_size;
130 static dma_addr_t bus_addr = 0;
131 static char *prev_addr;
132 static int prev_dir;
133 int dir;
134
135 doing_vdma = 0;
136 dir = (mode == DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
137
138 if (bus_addr
139 && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
140 /* different from last time -- unmap prev */
141 pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
142 bus_addr = 0;
143 }
144
145 if (!bus_addr) /* need to map it */
146 bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);
147
148 /* remember this one as prev */
149 prev_addr = addr;
150 prev_size = size;
151 prev_dir = dir;
152
153 fd_clear_dma_ff();
154 fd_set_dma_mode(mode);
155 set_dma_addr(FLOPPY_DMA, bus_addr);
156 fd_set_dma_count(size);
157 virtual_dma_port = io;
158 fd_enable_dma();
159
160 return 0;
161 }
162
163 static struct fd_dma_ops real_dma_ops =
164 {
165 ._disable_dma = disable_dma,
166 ._free_dma = free_dma,
167 ._get_dma_residue = get_dma_residue,
168 ._dma_setup = hard_dma_setup
169 };
170
171 static struct fd_dma_ops virt_dma_ops =
172 {
173 ._disable_dma = vdma_disable_dma,
174 ._free_dma = vdma_nop,
175 ._get_dma_residue = vdma_get_dma_residue,
176 ._dma_setup = vdma_dma_setup
177 };
178
fd_request_dma(void)179 static int fd_request_dma(void)
180 {
181 if (can_use_virtual_dma & 1) {
182 fd_ops = &virt_dma_ops;
183 return 0;
184 }
185 else {
186 fd_ops = &real_dma_ops;
187 return request_dma(FLOPPY_DMA, "floppy");
188 }
189 }
190
191 static int FDC1 = 0x3f0;
192 static int FDC2 = -1;
193
194 /*
195 * Again, the CMOS information not available
196 */
197 #define FLOPPY0_TYPE 6
198 #define FLOPPY1_TYPE 0
199
200 #define N_FDC 2 /* Don't change this! */
201 #define N_DRIVE 8
202
203 /*
204 * The PowerPC has no problems with floppy DMA crossing 64k borders.
205 */
206 #define CROSS_64KB(a,s) (0)
207
208 #define EXTRA_FLOPPY_PARAMS
209
210 #endif /* __KERNEL__ */
211 #endif /* __ASM_POWERPC_FLOPPY_H */
212
