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 /*
  17  * While sparc64 doesn't have an ISA DMA API, we provide something that looks
  18  * close enough to make parport_pc happy
  19  */
  20 #define HAS_DMA
  21
  22 static struct sparc_ebus_info {
  23         struct ebus_dma_info info;
  24         unsigned int addr;
  25         unsigned int count;
  26 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  27
  28 static __inline__ void enable_dma(unsigned int dmanr)
  29 {
  30         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  31
  32         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  33                              sparc_ebus_dmas[dmanr].addr,
  34                              sparc_ebus_dmas[dmanr].count))
  35                 BUG();
  36 }
  37
  38 static __inline__ void disable_dma(unsigned int dmanr)
  39 {
  40         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  41 }
  42
  43 static __inline__ void clear_dma_ff(unsigned int dmanr)
  44 {
  45         /* nothing */
  46 }
  47
  48 static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
  49 {
  50         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  51 }
  52
  53 static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int addr)
  54 {
  55         sparc_ebus_dmas[dmanr].addr = addr;
  56 }
  57
  58 static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
  59 {
  60         sparc_ebus_dmas[dmanr].count = count;
  61 }
  62
  63 static __inline__ unsigned int get_dma_residue(unsigned int dmanr)
  64 {
  65         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
  66 }
  67
  68 static int ebus_ecpp_p(struct linux_ebus_device *edev)
  69 {
  70         if (!strcmp(edev->prom_name, "ecpp"))
  71                 return 1;
  72         if (!strcmp(edev->prom_name, "parallel")) {
  73                 char compat[19];
  74                 prom_getstring(edev->prom_node,
  75                                "compatible",
  76                                compat, sizeof(compat));
  77                 compat[18] = '\0';
  78                 if (!strcmp(compat, "ecpp"))
  79                         return 1;
  80                 if (!strcmp(compat, "ns87317-ecpp") &&
  81                     !strcmp(compat + 13, "ecpp"))
  82                         return 1;
  83         }
  84         return 0;
  85 }
  86
  87 static int parport_isa_probe(int count)
  88 {
  89         struct sparc_isa_bridge *isa_br;
  90         struct sparc_isa_device *isa_dev;
  91
  92         for_each_isa(isa_br) {
  93                 for_each_isadev(isa_dev, isa_br) {
  94                         struct sparc_isa_device *child;
  95                         unsigned long base;
  96
  97                         if (strcmp(isa_dev->prom_name, "dma"))
  98                                 continue;
  99
 100                         child = isa_dev->child;
 101                         while (child) {
 102                                 if (!strcmp(child->prom_name, "parallel"))
 103                                         break;
 104                                 child = child->next;
 105                         }
 106                         if (!child)
 107                                 continue;
 108
 109                         base = child->resource.start;
 110
 111                         /* No DMA, see commentary in
 112                          * asm-sparc64/floppy.h:isa_floppy_init()
 113                          */
 114                         if (parport_pc_probe_port(base, base + 0x400,
 115                                                   child->irq, PARPORT_DMA_NOFIFO,
 116                                                   child->bus->self))
 117                                 count++;
 118                 }
 119         }
 120
 121         return count;
 122 }
 123
 124 static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
 125 {
 126         struct linux_ebus *ebus;
 127         struct linux_ebus_device *edev;
 128         int count = 0;
 129
 130         for_each_ebus(ebus) {
 131                 for_each_ebusdev(edev, ebus) {
 132                         if (ebus_ecpp_p(edev)) {
 133                                 unsigned long base = edev->resource[0].start;
 134                                 unsigned long config = edev->resource[1].start;
 135                                 unsigned long d_base = edev->resource[2].start;
 136                                 unsigned long d_len;
 137
 138                                 spin_lock_init(&sparc_ebus_dmas[count].info.lock);
 139                                 d_len = (edev->resource[2].end -
 140                                          d_base) + 1;
 141                                 sparc_ebus_dmas[count].info.regs =
 142                                         ioremap(d_base, d_len);
 143                                 if (!sparc_ebus_dmas[count].info.regs)
 144                                         continue;
 145                                 sparc_ebus_dmas[count].info.flags = 0;
 146                                 sparc_ebus_dmas[count].info.callback = NULL;
 147                                 sparc_ebus_dmas[count].info.client_cookie = NULL;
 148                                 sparc_ebus_dmas[count].info.irq = 0xdeadbeef;
 149                                 strcpy(sparc_ebus_dmas[count].info.name, "parport");
 150                                 if (ebus_dma_register(&sparc_ebus_dmas[count].info))
 151                                         continue;
 152                                 ebus_dma_irq_enable(&sparc_ebus_dmas[count].info, 1);
 153
 154                                 /* Configure IRQ to Push Pull, Level Low */
 155                                 /* Enable ECP, set bit 2 of the CTR first */
 156                                 outb(0x04, base + 0x02);
 157                                 ns87303_modify(config, PCR,
 158                                                PCR_EPP_ENABLE |
 159                                                PCR_IRQ_ODRAIN,
 160                                                PCR_ECP_ENABLE |
 161                                                PCR_ECP_CLK_ENA |
 162                                                PCR_IRQ_POLAR);
 163
 164                                 /* CTR bit 5 controls direction of port */
 165                                 ns87303_modify(config, PTR,
 166                                                0, PTR_LPT_REG_DIR);
 167
 168                                 if (parport_pc_probe_port(base, base + 0x400,
 169                                                           edev->irqs[0],
 170                                                           count, ebus->self))
 171                                         count++;
 172                         }
 173                 }
 174         }
 175
 176         count = parport_isa_probe(count);
 177
 178         return count;
 179 }
 180
 181 #endif /* !(_ASM_SPARC64_PARPORT_H */