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 DEFINE_SPINLOCK(dma_spin_lock);
  23
  24 #define claim_dma_lock() \
  25 ({      unsigned long flags; \
  26         spin_lock_irqsave(&dma_spin_lock, flags); \
  27         flags; \
  28 })
  29
  30 #define release_dma_lock(__flags) \
  31         spin_unlock_irqrestore(&dma_spin_lock, __flags);
  32
  33 static struct sparc_ebus_info {
  34         struct ebus_dma_info info;
  35         unsigned int addr;
  36         unsigned int count;
  37         int lock;
  38 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  39
  40 static __inline__ int request_dma(unsigned int dmanr, const char *device_id)
  41 {
  42         if (dmanr >= PARPORT_PC_MAX_PORTS)
  43                 return -EINVAL;
  44         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  45                 return -EBUSY;
  46         return 0;
  47 }
  48
  49 static __inline__ void free_dma(unsigned int dmanr)
  50 {
  51         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  52                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  53                 return;
  54         }
  55         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  56                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  57                 return;
  58         }
  59 }
  60
  61 static __inline__ void enable_dma(unsigned int dmanr)
  62 {
  63         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  64
  65         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  66                              sparc_ebus_dmas[dmanr].addr,
  67                              sparc_ebus_dmas[dmanr].count))
  68                 BUG();
  69 }
  70
  71 static __inline__ void disable_dma(unsigned int dmanr)
  72 {
  73         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  74 }
  75
  76 static __inline__ void clear_dma_ff(unsigned int dmanr)
  77 {
  78         /* nothing */
  79 }
  80
  81 static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
  82 {
  83         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  84 }
  85
  86 static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int addr)
  87 {
  88         sparc_ebus_dmas[dmanr].addr = addr;
  89 }
  90
  91 static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
  92 {
  93         sparc_ebus_dmas[dmanr].count = count;
  94 }
  95
  96 static __inline__ unsigned int get_dma_residue(unsigned int dmanr)
  97 {
  98         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
  99 }
 100
 101 static int ebus_ecpp_p(struct linux_ebus_device *edev)
 102 {
 103         if (!strcmp(edev->prom_node->name, "ecpp"))
 104                 return 1;
 105         if (!strcmp(edev->prom_node->name, "parallel")) {
 106                 char *compat;
 107
 108                 compat = of_get_property(edev->prom_node,
 109                                          "compatible", NULL);
 110                 if (compat &&
 111                     (!strcmp(compat, "ecpp") ||
 112                      !strcmp(compat, "ns87317-ecpp") ||
 113                      !strcmp(compat + 13, "ecpp")))
 114                         return 1;
 115         }
 116         return 0;
 117 }
 118
 119 static int parport_isa_probe(int count)
 120 {
 121         struct sparc_isa_bridge *isa_br;
 122         struct sparc_isa_device *isa_dev;
 123
 124         for_each_isa(isa_br) {
 125                 for_each_isadev(isa_dev, isa_br) {
 126                         struct sparc_isa_device *child;
 127                         unsigned long base;
 128
 129                         if (strcmp(isa_dev->prom_node->name, "dma"))
 130                                 continue;
 131
 132                         child = isa_dev->child;
 133                         while (child) {
 134                                 if (!strcmp(child->prom_node->name, "parallel"))
 135                                         break;
 136                                 child = child->next;
 137                         }
 138                         if (!child)
 139                                 continue;
 140
 141                         base = child->resource.start;
 142
 143                         /* No DMA, see commentary in
 144                          * asm-sparc64/floppy.h:isa_floppy_init()
 145                          */
 146                         if (parport_pc_probe_port(base, base + 0x400,
 147                                                   child->irq, PARPORT_DMA_NOFIFO,
 148                                                   child->bus->self))
 149                                 count++;
 150                 }
 151         }
 152
 153         return count;
 154 }
 155
 156 static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
 157 {
 158         struct linux_ebus *ebus;
 159         struct linux_ebus_device *edev;
 160         int count = 0;
 161
 162         for_each_ebus(ebus) {
 163                 for_each_ebusdev(edev, ebus) {
 164                         if (ebus_ecpp_p(edev)) {
 165                                 unsigned long base = edev->resource[0].start;
 166                                 unsigned long config = edev->resource[1].start;
 167                                 unsigned long d_base = edev->resource[2].start;
 168                                 unsigned long d_len;
 169
 170                                 spin_lock_init(&sparc_ebus_dmas[count].info.lock);
 171                                 d_len = (edev->resource[2].end -
 172                                          d_base) + 1;
 173                                 sparc_ebus_dmas[count].info.regs =
 174                                         ioremap(d_base, d_len);
 175                                 if (!sparc_ebus_dmas[count].info.regs)
 176                                         continue;
 177                                 sparc_ebus_dmas[count].info.flags = 0;
 178                                 sparc_ebus_dmas[count].info.callback = NULL;
 179                                 sparc_ebus_dmas[count].info.client_cookie = NULL;
 180                                 sparc_ebus_dmas[count].info.irq = 0xdeadbeef;
 181                                 strcpy(sparc_ebus_dmas[count].info.name, "parport");
 182                                 if (ebus_dma_register(&sparc_ebus_dmas[count].info))
 183                                         continue;
 184                                 ebus_dma_irq_enable(&sparc_ebus_dmas[count].info, 1);
 185
 186                                 /* Configure IRQ to Push Pull, Level Low */
 187                                 /* Enable ECP, set bit 2 of the CTR first */
 188                                 outb(0x04, base + 0x02);
 189                                 ns87303_modify(config, PCR,
 190                                                PCR_EPP_ENABLE |
 191                                                PCR_IRQ_ODRAIN,
 192                                                PCR_ECP_ENABLE |
 193                                                PCR_ECP_CLK_ENA |
 194                                                PCR_IRQ_POLAR);
 195
 196                                 /* CTR bit 5 controls direction of port */
 197                                 ns87303_modify(config, PTR,
 198                                                0, PTR_LPT_REG_DIR);
 199
 200                                 if (parport_pc_probe_port(base, base + 0x400,
 201                                                           edev->irqs[0],
 202                                                           count, ebus->self))
 203                                         count++;
 204                         }
 205                 }
 206         }
 207
 208         count = parport_isa_probe(count);
 209
 210         return count;
 211 }
 212
 213 #endif /* !(_ASM_SPARC64_PARPORT_H */