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C/C++ Source or Header  |  2005-10-13  |  7KB  |  320 lines
  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_I386_FLOPPY_H
  11. #define __ASM_I386_FLOPPY_H
  12.  
  13. #include <linux/vmalloc.h>
  14.  
  15.  
  16. /*
  17.  * The DMA channel used by the floppy controller cannot access data at
  18.  * addresses >= 16MB
  19.  *
  20.  * Went back to the 1MB limit, as some people had problems with the floppy
  21.  * driver otherwise. It doesn't matter much for performance anyway, as most
  22.  * floppy accesses go through the track buffer.
  23.  */
  24. #define _CROSS_64KB(a,s,vdma) \
  25. (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
  26.  
  27. #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
  28.  
  29.  
  30. #define SW fd_routine[use_virtual_dma&1]
  31. #define CSW fd_routine[can_use_virtual_dma & 1]
  32.  
  33.  
  34. #define fd_inb(port)            inb_p(port)
  35. #define fd_outb(value,port)        outb_p(value,port)
  36.  
  37. #define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
  38. #define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
  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()    SW._get_dma_residue(FLOPPY_DMA)
  43. #define fd_dma_mem_alloc(size)    SW._dma_mem_alloc(size)
  44. #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
  45.  
  46. #define FLOPPY_CAN_FALLBACK_ON_NODMA
  47.  
  48. static int virtual_dma_count;
  49. static int virtual_dma_residue;
  50. static char *virtual_dma_addr;
  51. static int virtual_dma_mode;
  52. static int doing_pdma;
  53.  
  54. static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
  55. {
  56.     register unsigned char st;
  57.  
  58. #undef TRACE_FLPY_INT
  59. #define NO_FLOPPY_ASSEMBLER
  60.  
  61. #ifdef TRACE_FLPY_INT
  62.     static int calls=0;
  63.     static int bytes=0;
  64.     static int dma_wait=0;
  65. #endif
  66.     if (!doing_pdma)
  67.         return floppy_interrupt(irq, dev_id, regs);
  68.  
  69. #ifdef TRACE_FLPY_INT
  70.     if(!calls)
  71.         bytes = virtual_dma_count;
  72. #endif
  73.  
  74. #ifndef NO_FLOPPY_ASSEMBLER
  75.     __asm__ (
  76.        "testl %1,%1"
  77.     "je 3f"
  78. "1:    inb %w4,%b0"
  79.     "andb $160,%b0"
  80.     "cmpb $160,%b0"
  81.     "jne 2f"
  82.     "incw %w4"
  83.     "testl %3,%3"
  84.     "jne 4f"
  85.     "inb %w4,%b0"
  86.     "movb %0,(%2)"
  87.     "jmp 5f"
  88. "4:        movb (%2),%0"
  89.     "outb %b0,%w4"
  90. "5:    decw %w4"
  91.     "outb %0,$0x80"
  92.     "decl %1"
  93.     "incl %2"
  94.     "testl %1,%1"
  95.     "jne 1b"
  96. "3:    inb %w4,%b0"
  97. "2:    "
  98.        : "=a" ((char) st), 
  99.        "=c" ((long) virtual_dma_count), 
  100.        "=S" ((long) virtual_dma_addr)
  101.        : "b" ((long) virtual_dma_mode),
  102.        "d" ((short) virtual_dma_port+4), 
  103.        "1" ((long) virtual_dma_count),
  104.        "2" ((long) virtual_dma_addr));
  105. #else    
  106.     {
  107.         register int lcount;
  108.         register char *lptr;
  109.  
  110.         st = 1;
  111.         for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 
  112.             lcount; lcount--, lptr++) {
  113.             st=inb(virtual_dma_port+4) & 0xa0 ;
  114.             if(st != 0xa0) 
  115.                 break;
  116.             if(virtual_dma_mode)
  117.                 outb_p(*lptr, virtual_dma_port+5);
  118.             else
  119.                 *lptr = inb_p(virtual_dma_port+5);
  120.         }
  121.         virtual_dma_count = lcount;
  122.         virtual_dma_addr = lptr;
  123.         st = inb(virtual_dma_port+4);
  124.     }
  125. #endif
  126.  
  127. #ifdef TRACE_FLPY_INT
  128.     calls++;
  129. #endif
  130.     if(st == 0x20)
  131.         return IRQ_HANDLED;
  132.     if(!(st & 0x20)) {
  133.         virtual_dma_residue += virtual_dma_count;
  134.         virtual_dma_count=0;
  135. #ifdef TRACE_FLPY_INT
  136.         printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 
  137.                virtual_dma_count, virtual_dma_residue, calls, bytes,
  138.                dma_wait);
  139.         calls = 0;
  140.         dma_wait=0;
  141. #endif
  142.         doing_pdma = 0;
  143.         floppy_interrupt(irq, dev_id, regs);
  144.         return IRQ_HANDLED;
  145.     }
  146. #ifdef TRACE_FLPY_INT
  147.     if(!virtual_dma_count)
  148.         dma_wait++;
  149. #endif
  150.     return IRQ_HANDLED;
  151. }
  152.  
  153. static void fd_disable_dma(void)
  154. {
  155.     if(! (can_use_virtual_dma & 1))
  156.         disable_dma(FLOPPY_DMA);
  157.     doing_pdma = 0;
  158.     virtual_dma_residue += virtual_dma_count;
  159.     virtual_dma_count=0;
  160. }
  161.  
  162. static int vdma_request_dma(unsigned int dmanr, const char * device_id)
  163. {
  164.     return 0;
  165. }
  166.  
  167. static void vdma_nop(unsigned int dummy)
  168. {
  169. }
  170.  
  171.  
  172. static int vdma_get_dma_residue(unsigned int dummy)
  173. {
  174.     return virtual_dma_count + virtual_dma_residue;
  175. }
  176.  
  177.  
  178. static int fd_request_irq(void)
  179. {
  180.     if(can_use_virtual_dma)
  181.         return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
  182.                            "floppy", NULL);
  183.     else
  184.         return request_irq(FLOPPY_IRQ, floppy_interrupt,
  185.                            SA_INTERRUPT|SA_SAMPLE_RANDOM,
  186.                            "floppy", NULL);    
  187.  
  188. }
  189.  
  190. static unsigned long dma_mem_alloc(unsigned long size)
  191. {
  192.     return __get_dma_pages(GFP_KERNEL,get_order(size));
  193. }
  194.  
  195.  
  196. static unsigned long vdma_mem_alloc(unsigned long size)
  197. {
  198.     return (unsigned long) vmalloc(size);
  199.  
  200. }
  201.  
  202. #define nodma_mem_alloc(size) vdma_mem_alloc(size)
  203.  
  204. static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
  205. {
  206.     if((unsigned int) addr >= (unsigned int) high_memory)
  207.         vfree((void *)addr);
  208.     else
  209.         free_pages(addr, get_order(size));        
  210. }
  211.  
  212. #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size) 
  213.  
  214. static void _fd_chose_dma_mode(char *addr, unsigned long size)
  215. {
  216.     if(can_use_virtual_dma == 2) {
  217.         if((unsigned int) addr >= (unsigned int) high_memory ||
  218.            isa_virt_to_bus(addr) >= 0x1000000 ||
  219.            _CROSS_64KB(addr, size, 0))
  220.             use_virtual_dma = 1;
  221.         else
  222.             use_virtual_dma = 0;
  223.     } else {
  224.         use_virtual_dma = can_use_virtual_dma & 1;
  225.     }
  226. }
  227.  
  228. #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
  229.  
  230.  
  231. static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
  232. {
  233.     doing_pdma = 1;
  234.     virtual_dma_port = io;
  235.     virtual_dma_mode = (mode  == DMA_MODE_WRITE);
  236.     virtual_dma_addr = addr;
  237.     virtual_dma_count = size;
  238.     virtual_dma_residue = 0;
  239.     return 0;
  240. }
  241.  
  242. static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
  243. {
  244. #ifdef FLOPPY_SANITY_CHECK
  245.     if (CROSS_64KB(addr, size)) {
  246.         printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
  247.         return -1;
  248.     }
  249. #endif
  250.     /* actual, physical DMA */
  251.     doing_pdma = 0;
  252.     clear_dma_ff(FLOPPY_DMA);
  253.     set_dma_mode(FLOPPY_DMA,mode);
  254.     set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
  255.     set_dma_count(FLOPPY_DMA,size);
  256.     enable_dma(FLOPPY_DMA);
  257.     return 0;
  258. }
  259.  
  260. struct fd_routine_l {
  261.     int (*_request_dma)(unsigned int dmanr, const char * device_id);
  262.     void (*_free_dma)(unsigned int dmanr);
  263.     int (*_get_dma_residue)(unsigned int dummy);
  264.     unsigned long (*_dma_mem_alloc) (unsigned long size);
  265.     int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
  266. } fd_routine[] = {
  267.     {
  268.         request_dma,
  269.         free_dma,
  270.         get_dma_residue,
  271.         dma_mem_alloc,
  272.         hard_dma_setup
  273.     },
  274.     {
  275.         vdma_request_dma,
  276.         vdma_nop,
  277.         vdma_get_dma_residue,
  278.         vdma_mem_alloc,
  279.         vdma_dma_setup
  280.     }
  281. };
  282.  
  283.  
  284. static int FDC1 = 0x3f0;
  285. static int FDC2 = -1;
  286.  
  287. /*
  288.  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
  289.  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
  290.  * coincides with another rtc CMOS user.        Paul G.
  291.  */
  292. #define FLOPPY0_TYPE    ({                \
  293.     unsigned long flags;                \
  294.     unsigned char val;                \
  295.     spin_lock_irqsave(&rtc_lock, flags);        \
  296.     val = (CMOS_READ(0x10) >> 4) & 15;        \
  297.     spin_unlock_irqrestore(&rtc_lock, flags);    \
  298.     val;                        \
  299. })
  300.  
  301. #define FLOPPY1_TYPE    ({                \
  302.     unsigned long flags;                \
  303.     unsigned char val;                \
  304.     spin_lock_irqsave(&rtc_lock, flags);        \
  305.     val = CMOS_READ(0x10) & 15;            \
  306.     spin_unlock_irqrestore(&rtc_lock, flags);    \
  307.     val;                        \
  308. })
  309.  
  310. #define N_FDC 2
  311. #define N_DRIVE 8
  312.  
  313. #define FLOPPY_MOTOR_MASK 0xf0
  314.  
  315. #define AUTO_DMA
  316.  
  317. #define EXTRA_FLOPPY_PARAMS
  318.  
  319. #endif /* __ASM_I386_FLOPPY_H */
  320.