ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/floppy.h @ 8940:57af6b1cfa3a

Fix I/O port address for first floppy controller on x86_64.
As a consequence, some of the i386 changes over native code need to also be
added to x86-64.

From: Jan Beulich <JBeulich@novell.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
author cl349@firebug.cl.cam.ac.uk
date Mon Feb 20 17:59:41 2006 +0000 (2006-02-20)
parents fd9b2c1bb577
children 4fad820a2233
line source
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 * Modifications for Xen are Copyright (c) 2004, Keir Fraser.
11 */
12 #ifndef __ASM_XEN_X86_64_FLOPPY_H
13 #define __ASM_XEN_X86_64_FLOPPY_H
15 #include <linux/vmalloc.h>
17 /*
18 * The DMA channel used by the floppy controller cannot access data at
19 * addresses >= 16MB
20 *
21 * Went back to the 1MB limit, as some people had problems with the floppy
22 * driver otherwise. It doesn't matter much for performance anyway, as most
23 * floppy accesses go through the track buffer.
24 */
25 #define _CROSS_64KB(a,s,vdma) \
26 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
28 /* XEN: Hit DMA paths on the head. This trick from asm-m68k/floppy.h. */
29 #include <asm/dma.h>
30 #undef MAX_DMA_ADDRESS
31 #define MAX_DMA_ADDRESS 0
32 #define CROSS_64KB(a,s) (0)
34 #define fd_inb(port) inb_p(port)
35 #define fd_outb(value,port) outb_p(value,port)
37 #define fd_request_dma() (0)
38 #define fd_free_dma() ((void)0)
39 #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
40 #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
41 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
42 #define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA)
43 /*
44 * Do not use vmalloc/vfree: floppy_release_irq_and_dma() gets called from
45 * softirq context via motor_off_callback. A generic bug we happen to trigger.
46 */
47 #define fd_dma_mem_alloc(size) __get_free_pages(GFP_KERNEL, get_order(size))
48 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
49 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
51 static int virtual_dma_count;
52 static int virtual_dma_residue;
53 static char *virtual_dma_addr;
54 static int virtual_dma_mode;
55 static int doing_pdma;
57 static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
58 {
59 register unsigned char st;
61 #undef TRACE_FLPY_INT
63 #ifdef TRACE_FLPY_INT
64 static int calls=0;
65 static int bytes=0;
66 static int dma_wait=0;
67 #endif
68 if (!doing_pdma)
69 return floppy_interrupt(irq, dev_id, regs);
71 #ifdef TRACE_FLPY_INT
72 if(!calls)
73 bytes = virtual_dma_count;
74 #endif
76 {
77 register int lcount;
78 register char *lptr;
80 st = 1;
81 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
82 lcount; lcount--, lptr++) {
83 st=inb(virtual_dma_port+4) & 0xa0 ;
84 if(st != 0xa0)
85 break;
86 if(virtual_dma_mode)
87 outb_p(*lptr, virtual_dma_port+5);
88 else
89 *lptr = inb_p(virtual_dma_port+5);
90 }
91 virtual_dma_count = lcount;
92 virtual_dma_addr = lptr;
93 st = inb(virtual_dma_port+4);
94 }
96 #ifdef TRACE_FLPY_INT
97 calls++;
98 #endif
99 if(st == 0x20)
100 return IRQ_HANDLED;
101 if(!(st & 0x20)) {
102 virtual_dma_residue += virtual_dma_count;
103 virtual_dma_count=0;
104 #ifdef TRACE_FLPY_INT
105 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
106 virtual_dma_count, virtual_dma_residue, calls, bytes,
107 dma_wait);
108 calls = 0;
109 dma_wait=0;
110 #endif
111 doing_pdma = 0;
112 floppy_interrupt(irq, dev_id, regs);
113 return IRQ_HANDLED;
114 }
115 #ifdef TRACE_FLPY_INT
116 if(!virtual_dma_count)
117 dma_wait++;
118 #endif
119 return IRQ_HANDLED;
120 }
122 static void fd_disable_dma(void)
123 {
124 doing_pdma = 0;
125 virtual_dma_residue += virtual_dma_count;
126 virtual_dma_count=0;
127 }
129 static int vdma_get_dma_residue(unsigned int dummy)
130 {
131 return virtual_dma_count + virtual_dma_residue;
132 }
135 static int fd_request_irq(void)
136 {
137 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
138 "floppy", NULL);
139 }
141 #if 0
142 static unsigned long vdma_mem_alloc(unsigned long size)
143 {
144 return (unsigned long) vmalloc(size);
146 }
148 static void vdma_mem_free(unsigned long addr, unsigned long size)
149 {
150 vfree((void *)addr);
151 }
152 #endif
154 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
155 {
156 doing_pdma = 1;
157 virtual_dma_port = io;
158 virtual_dma_mode = (mode == DMA_MODE_WRITE);
159 virtual_dma_addr = addr;
160 virtual_dma_count = size;
161 virtual_dma_residue = 0;
162 return 0;
163 }
165 /* XEN: This trick to force 'virtual DMA' is from include/asm-m68k/floppy.h. */
166 #define FDC1 xen_floppy_init()
167 static int FDC2 = -1;
169 static int xen_floppy_init(void)
170 {
171 use_virtual_dma = 1;
172 can_use_virtual_dma = 1;
173 return 0x3f0;
174 }
176 /*
177 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
178 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
179 * coincides with another rtc CMOS user. Paul G.
180 */
181 #define FLOPPY0_TYPE ({ \
182 unsigned long flags; \
183 unsigned char val; \
184 spin_lock_irqsave(&rtc_lock, flags); \
185 val = (CMOS_READ(0x10) >> 4) & 15; \
186 spin_unlock_irqrestore(&rtc_lock, flags); \
187 val; \
188 })
190 #define FLOPPY1_TYPE ({ \
191 unsigned long flags; \
192 unsigned char val; \
193 spin_lock_irqsave(&rtc_lock, flags); \
194 val = CMOS_READ(0x10) & 15; \
195 spin_unlock_irqrestore(&rtc_lock, flags); \
196 val; \
197 })
199 #define N_FDC 2
200 #define N_DRIVE 8
202 #define FLOPPY_MOTOR_MASK 0xf0
204 #define EXTRA_FLOPPY_PARAMS
206 #endif /* __ASM_XEN_X86_64_FLOPPY_H */