arch/sparc/include/asm/parport.h

   1 /* parport.h: sparc64 specific parport initialization and dma.
   2  *
   3  * Copyright (C) 1999  Eddie C. Dost  (ecd@skynet.be)
   4  */
   5
   6 #ifndef _ASM_SPARC64_PARPORT_H
   7 #define _ASM_SPARC64_PARPORT_H 1
   8
   9 #include <linux/of_device.h>
  10
  11 #include <asm/ebus_dma.h>
  12 #include <asm/ns87303.h>
  13 #include <asm/prom.h>
  14
  15 #define PARPORT_PC_MAX_PORTS    PARPORT_MAX
  16
  17 /*
  18  * While sparc64 doesn't have an ISA DMA API, we provide something that looks
  19  * close enough to make parport_pc happy
  20  */
  21 #define HAS_DMA
  22
  23 #ifdef CONFIG_PARPORT_PC_FIFO
  24 static DEFINE_SPINLOCK(dma_spin_lock);
  25
  26 #define claim_dma_lock() \
  27 ({      unsigned long flags; \
  28         spin_lock_irqsave(&dma_spin_lock, flags); \
  29         flags; \
  30 })
  31
  32 #define release_dma_lock(__flags) \
  33         spin_unlock_irqrestore(&dma_spin_lock, __flags);
  34 #endif
  35
  36 static struct sparc_ebus_info {
  37         struct ebus_dma_info info;
  38         unsigned int addr;
  39         unsigned int count;
  40         int lock;
  41
  42         struct parport *port;
  43 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  44
  45 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
  46
  47 static inline int request_dma(unsigned int dmanr, const char *device_id)
  48 {
  49         if (dmanr >= PARPORT_PC_MAX_PORTS)
  50                 return -EINVAL;
  51         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  52                 return -EBUSY;
  53         return 0;
  54 }
  55
  56 static inline void free_dma(unsigned int dmanr)
  57 {
  58         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  59                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  60                 return;
  61         }
  62         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  63                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  64                 return;
  65         }
  66 }
  67
  68 static inline void enable_dma(unsigned int dmanr)
  69 {
  70         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  71
  72         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  73                              sparc_ebus_dmas[dmanr].addr,
  74                              sparc_ebus_dmas[dmanr].count))
  75                 BUG();
  76 }
  77
  78 static inline void disable_dma(unsigned int dmanr)
  79 {
  80         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  81 }
  82
  83 static inline void clear_dma_ff(unsigned int dmanr)
  84 {
  85         /* nothing */
  86 }
  87
  88 static inline void set_dma_mode(unsigned int dmanr, char mode)
  89 {
  90         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  91 }
  92
  93 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
  94 {
  95         sparc_ebus_dmas[dmanr].addr = addr;
  96 }
  97
  98 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
  99 {
 100         sparc_ebus_dmas[dmanr].count = count;
 101 }
 102
 103 static inline unsigned int get_dma_residue(unsigned int dmanr)
 104 {
 105         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
 106 }
 107
 108 static int ecpp_probe(struct platform_device *op)
 109 {
 110         unsigned long base = op->resource[0].start;
 111         unsigned long config = op->resource[1].start;
 112         unsigned long d_base = op->resource[2].start;
 113         unsigned long d_len;
 114         struct device_node *parent;
 115         struct parport *p;
 116         int slot, err;
 117
 118         parent = op->dev.of_node->parent;
 119         if (!strcmp(parent->name, "dma")) {
 120                 p = parport_pc_probe_port(base, base + 0x400,
 121                                           op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
 122                                           op->dev.parent->parent, 0);
 123                 if (!p)
 124                         return -ENOMEM;
 125                 dev_set_drvdata(&op->dev, p);
 126                 return 0;
 127         }
 128
 129         for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
 130                 if (!test_and_set_bit(slot, dma_slot_map))
 131                         break;
 132         }
 133         err = -ENODEV;
 134         if (slot >= PARPORT_PC_MAX_PORTS)
 135                 goto out_err;
 136
 137         spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
 138
 139         d_len = (op->resource[2].end - d_base) + 1UL;
 140         sparc_ebus_dmas[slot].info.regs =
 141                 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
 142
 143         if (!sparc_ebus_dmas[slot].info.regs)
 144                 goto out_clear_map;
 145
 146         sparc_ebus_dmas[slot].info.flags = 0;
 147         sparc_ebus_dmas[slot].info.callback = NULL;
 148         sparc_ebus_dmas[slot].info.client_cookie = NULL;
 149         sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
 150         strcpy(sparc_ebus_dmas[slot].info.name, "parport");
 151         if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
 152                 goto out_unmap_regs;
 153
 154         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
 155
 156         /* Configure IRQ to Push Pull, Level Low */
 157         /* Enable ECP, set bit 2 of the CTR first */
 158         outb(0x04, base + 0x02);
 159         ns87303_modify(config, PCR,
 160                        PCR_EPP_ENABLE |
 161                        PCR_IRQ_ODRAIN,
 162                        PCR_ECP_ENABLE |
 163                        PCR_ECP_CLK_ENA |
 164                        PCR_IRQ_POLAR);
 165
 166         /* CTR bit 5 controls direction of port */
 167         ns87303_modify(config, PTR,
 168                        0, PTR_LPT_REG_DIR);
 169
 170         p = parport_pc_probe_port(base, base + 0x400,
 171                                   op->archdata.irqs[0],
 172                                   slot,
 173                                   op->dev.parent,
 174                                   0);
 175         err = -ENOMEM;
 176         if (!p)
 177                 goto out_disable_irq;
 178
 179         dev_set_drvdata(&op->dev, p);
 180
 181         return 0;
 182
 183 out_disable_irq:
 184         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 185         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 186
 187 out_unmap_regs:
 188         of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
 189
 190 out_clear_map:
 191         clear_bit(slot, dma_slot_map);
 192
 193 out_err:
 194         return err;
 195 }
 196
 197 static int ecpp_remove(struct platform_device *op)
 198 {
 199         struct parport *p = dev_get_drvdata(&op->dev);
 200         int slot = p->dma;
 201
 202         parport_pc_unregister_port(p);
 203
 204         if (slot != PARPORT_DMA_NOFIFO) {
 205                 unsigned long d_base = op->resource[2].start;
 206                 unsigned long d_len;
 207
 208                 d_len = (op->resource[2].end - d_base) + 1UL;
 209
 210                 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 211                 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 212                 of_iounmap(&op->resource[2],
 213                            sparc_ebus_dmas[slot].info.regs,
 214                            d_len);
 215                 clear_bit(slot, dma_slot_map);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static const struct of_device_id ecpp_match[] = {
 222         {
 223                 .name = "ecpp",
 224         },
 225         {
 226                 .name = "parallel",
 227                 .compatible = "ecpp",
 228         },
 229         {
 230                 .name = "parallel",
 231                 .compatible = "ns87317-ecpp",
 232         },
 233         {
 234                 .name = "parallel",
 235                 .compatible = "pnpALI,1533,3",
 236         },
 237         {},
 238 };
 239
 240 static struct platform_driver ecpp_driver = {
 241         .driver = {
 242                 .name = "ecpp",
 243                 .of_match_table = ecpp_match,
 244         },
 245         .probe                  = ecpp_probe,
 246         .remove                 = ecpp_remove,
 247 };
 248
 249 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
 250 {
 251         return platform_driver_register(&ecpp_driver);
 252 }
 253
 254 #endif /* !(_ASM_SPARC64_PARPORT_H */