git.oblomov.eu Git - linux-2.6/blob - 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         int lock;
  27 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  28
  29 static __inline__ int request_dma(unsigned int dmanr, const char *device_id)
  30 {
  31         if (dmanr >= PARPORT_PC_MAX_PORTS)
  32                 return -EINVAL;
  33         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  34                 return -EBUSY;
  35         return 0;
  36 }
  37
  38 static __inline__ void free_dma(unsigned int dmanr)
  39 {
  40         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  41                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  42                 return;
  43         }
  44         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  45                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  46                 return;
  47         }
  48 }
  49
  50 static __inline__ void enable_dma(unsigned int dmanr)
  51 {
  52         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  53
  54         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  55                              sparc_ebus_dmas[dmanr].addr,
  56                              sparc_ebus_dmas[dmanr].count))
  57                 BUG();
  58 }
  59
  60 static __inline__ void disable_dma(unsigned int dmanr)
  61 {
  62         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  63 }
  64
  65 static __inline__ void clear_dma_ff(unsigned int dmanr)
  66 {
  67         /* nothing */
  68 }
  69
  70 static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
  71 {
  72         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  73 }
  74
  75 static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int addr)
  76 {
  77         sparc_ebus_dmas[dmanr].addr = addr;
  78 }
  79
  80 static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
  81 {
  82         sparc_ebus_dmas[dmanr].count = count;
  83 }
  84
  85 static __inline__ unsigned int get_dma_residue(unsigned int dmanr)
  86 {
  87         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
  88 }
  89
  90 static int ebus_ecpp_p(struct linux_ebus_device *edev)
  91 {
  92         if (!strcmp(edev->prom_node->name, "ecpp"))
  93                 return 1;
  94         if (!strcmp(edev->prom_node->name, "parallel")) {
  95                 char *compat;
  96
  97                 compat = of_get_property(edev->prom_node,
  98                                          "compatible", NULL);
  99                 if (compat &&
 100                     (!strcmp(compat, "ecpp") ||
 101                      !strcmp(compat, "ns87317-ecpp") ||
 102                      !strcmp(compat + 13, "ecpp")))
 103                         return 1;
 104         }
 105         return 0;
 106 }
 107
 108 static int parport_isa_probe(int count)
 109 {
 110         struct sparc_isa_bridge *isa_br;
 111         struct sparc_isa_device *isa_dev;
 112
 113         for_each_isa(isa_br) {
 114                 for_each_isadev(isa_dev, isa_br) {
 115                         struct sparc_isa_device *child;
 116                         unsigned long base;
 117
 118                         if (strcmp(isa_dev->prom_node->name, "dma"))
 119                                 continue;
 120
 121                         child = isa_dev->child;
 122                         while (child) {
 123                                 if (!strcmp(child->prom_node->name, "parallel"))
 124                                         break;
 125                                 child = child->next;
 126                         }
 127                         if (!child)
 128                                 continue;
 129
 130                         base = child->resource.start;
 131
 132                         /* No DMA, see commentary in
 133                          * asm-sparc64/floppy.h:isa_floppy_init()
 134                          */
 135                         if (parport_pc_probe_port(base, base + 0x400,
 136                                                   child->irq, PARPORT_DMA_NOFIFO,
 137                                                   child->bus->self))
 138                                 count++;
 139                 }
 140         }
 141
 142         return count;
 143 }
 144
 145 static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
 146 {
 147         struct linux_ebus *ebus;
 148         struct linux_ebus_device *edev;
 149         int count = 0;
 150
 151         for_each_ebus(ebus) {
 152                 for_each_ebusdev(edev, ebus) {
 153                         if (ebus_ecpp_p(edev)) {
 154                                 unsigned long base = edev->resource[0].start;
 155                                 unsigned long config = edev->resource[1].start;
 156                                 unsigned long d_base = edev->resource[2].start;
 157                                 unsigned long d_len;
 158
 159                                 spin_lock_init(&sparc_ebus_dmas[count].info.lock);
 160                                 d_len = (edev->resource[2].end -
 161                                          d_base) + 1;
 162                                 sparc_ebus_dmas[count].info.regs =
 163                                         ioremap(d_base, d_len);
 164                                 if (!sparc_ebus_dmas[count].info.regs)
 165                                         continue;
 166                                 sparc_ebus_dmas[count].info.flags = 0;
 167                                 sparc_ebus_dmas[count].info.callback = NULL;
 168                                 sparc_ebus_dmas[count].info.client_cookie = NULL;
 169                                 sparc_ebus_dmas[count].info.irq = 0xdeadbeef;
 170                                 strcpy(sparc_ebus_dmas[count].info.name, "parport");
 171                                 if (ebus_dma_register(&sparc_ebus_dmas[count].info))
 172                                         continue;
 173                                 ebus_dma_irq_enable(&sparc_ebus_dmas[count].info, 1);
 174
 175                                 /* Configure IRQ to Push Pull, Level Low */
 176                                 /* Enable ECP, set bit 2 of the CTR first */
 177                                 outb(0x04, base + 0x02);
 178                                 ns87303_modify(config, PCR,
 179                                                PCR_EPP_ENABLE |
 180                                                PCR_IRQ_ODRAIN,
 181                                                PCR_ECP_ENABLE |
 182                                                PCR_ECP_CLK_ENA |
 183                                                PCR_IRQ_POLAR);
 184
 185                                 /* CTR bit 5 controls direction of port */
 186                                 ns87303_modify(config, PTR,
 187                                                0, PTR_LPT_REG_DIR);
 188
 189                                 if (parport_pc_probe_port(base, base + 0x400,
 190                                                           edev->irqs[0],
 191                                                           count, ebus->self))
 192                                         count++;
 193                         }
 194                 }
 195         }
 196
 197         count = parport_isa_probe(count);
 198
 199         return count;
 200 }
 201
 202 #endif /* !(_ASM_SPARC64_PARPORT_H */