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 static struct linux_ebus_dma *sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  17
  18 static __inline__ void
  19 reset_dma(unsigned int dmanr)
  20 {
  21         unsigned int dcsr;
  22
  23         writel(EBUS_DCSR_RESET, &sparc_ebus_dmas[dmanr]->dcsr);
  24         udelay(1);
  25         dcsr = EBUS_DCSR_BURST_SZ_16 | EBUS_DCSR_TCI_DIS |
  26                EBUS_DCSR_EN_CNT | EBUS_DCSR_INT_EN;
  27         writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
  28 }
  29
  30 static __inline__ void
  31 enable_dma(unsigned int dmanr)
  32 {
  33         unsigned int dcsr;
  34
  35         dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
  36         dcsr |= EBUS_DCSR_EN_DMA;
  37         writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
  38 }
  39
  40 static __inline__ void
  41 disable_dma(unsigned int dmanr)
  42 {
  43         unsigned int dcsr;
  44
  45         dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
  46         if (dcsr & EBUS_DCSR_EN_DMA) {
  47                 while (dcsr & EBUS_DCSR_DRAIN) {
  48                         udelay(1);
  49                         dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
  50                 }
  51                 dcsr &= ~(EBUS_DCSR_EN_DMA);
  52                 writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
  53
  54                 dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
  55                 if (dcsr & EBUS_DCSR_ERR_PEND)
  56                         reset_dma(dmanr);
  57         }
  58 }
  59
  60 static __inline__ void
  61 clear_dma_ff(unsigned int dmanr)
  62 {
  63         /* nothing */
  64 }
  65
  66 static __inline__ void
  67 set_dma_mode(unsigned int dmanr, char mode)
  68 {
  69         unsigned int dcsr;
  70
  71         dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
  72         dcsr |= EBUS_DCSR_EN_CNT | EBUS_DCSR_TC;
  73         if (mode == DMA_MODE_WRITE)
  74                 dcsr &= ~(EBUS_DCSR_WRITE);
  75         else
  76                 dcsr |= EBUS_DCSR_WRITE;
  77         writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
  78 }
  79
  80 static __inline__ void
  81 set_dma_addr(unsigned int dmanr, unsigned int addr)
  82 {
  83         writel(addr, &sparc_ebus_dmas[dmanr]->dacr);
  84 }
  85
  86 static __inline__ void
  87 set_dma_count(unsigned int dmanr, unsigned int count)
  88 {
  89         writel(count, &sparc_ebus_dmas[dmanr]->dbcr);
  90 }
  91
  92 static __inline__ int
  93 get_dma_residue(unsigned int dmanr)
  94 {
  95         int res;
  96
  97         res = readl(&sparc_ebus_dmas[dmanr]->dbcr);
  98         if (res != 0)
  99                 reset_dma(dmanr);
 100         return res;
 101 }
 102
 103 static int ebus_ecpp_p(struct linux_ebus_device *edev)
 104 {
 105         if (!strcmp(edev->prom_name, "ecpp"))
 106                 return 1;
 107         if (!strcmp(edev->prom_name, "parallel")) {
 108                 char compat[19];
 109                 prom_getstring(edev->prom_node,
 110                                "compatible",
 111                                compat, sizeof(compat));
 112                 compat[18] = '\0';
 113                 if (!strcmp(compat, "ecpp"))
 114                         return 1;
 115                 if (!strcmp(compat, "ns87317-ecpp") &&
 116                     !strcmp(compat + 13, "ecpp"))
 117                         return 1;
 118         }
 119         return 0;
 120 }
 121
 122 static int parport_isa_probe(int count)
 123 {
 124         struct isa_bridge *isa_br;
 125         struct isa_device *isa_dev;
 126
 127         for_each_isa(isa_br) {
 128                 for_each_isadev(isa_dev, isa_br) {
 129                         struct isa_device *child;
 130                         unsigned long base;
 131
 132                         if (strcmp(isa_dev->prom_name, "dma"))
 133                                 continue;
 134
 135                         child = isa_dev->child;
 136                         while (child) {
 137                                 if (!strcmp(child->prom_name, "parallel"))
 138                                         break;
 139                                 child = child->next;
 140                         }
 141                         if (!child)
 142                                 continue;
 143
 144                         base = child->resource.start;
 145
 146                         /* No DMA, see commentary in
 147                          * asm-sparc64/floppy.h:isa_floppy_init()
 148                          */
 149                         if (parport_pc_probe_port(base, base + 0x400,
 150                                                   child->irq, PARPORT_DMA_NOFIFO,
 151                                                   child->bus->self))
 152                                 count++;
 153                 }
 154         }
 155
 156         return count;
 157 }
 158
 159 static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
 160 {
 161         struct linux_ebus *ebus;
 162         struct linux_ebus_device *edev;
 163         int count = 0;
 164
 165         if (!pci_present())
 166                 return 0;
 167
 168         for_each_ebus(ebus) {
 169                 for_each_ebusdev(edev, ebus) {
 170                         if (ebus_ecpp_p(edev)) {
 171                                 unsigned long base = edev->resource[0].start;
 172                                 unsigned long config = edev->resource[1].start;
 173
 174                                 sparc_ebus_dmas[count] =
 175                                                 (struct linux_ebus_dma *)
 176                                                         edev->resource[2].start;
 177                                 reset_dma(count);
 178
 179                                 /* Configure IRQ to Push Pull, Level Low */
 180                                 /* Enable ECP, set bit 2 of the CTR first */
 181                                 outb(0x04, base + 0x02);
 182                                 ns87303_modify(config, PCR,
 183                                                PCR_EPP_ENABLE |
 184                                                PCR_IRQ_ODRAIN,
 185                                                PCR_ECP_ENABLE |
 186                                                PCR_ECP_CLK_ENA |
 187                                                PCR_IRQ_POLAR);
 188
 189                                 /* CTR bit 5 controls direction of port */
 190                                 ns87303_modify(config, PTR,
 191                                                0, PTR_LPT_REG_DIR);
 192
 193                                 if (parport_pc_probe_port(base, base + 0x400,
 194                                                           edev->irqs[0],
 195                                                           count, ebus->self))
 196                                         count++;
 197                         }
 198                 }
 199         }
 200
 201         count = parport_isa_probe(count);
 202
 203         return count;
 204 }
 205
 206 #endif /* !(_ASM_SPARC64_PARPORT_H */