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.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 static DEFINE_SPINLOCK(dma_spin_lock);
  24
  25 #define claim_dma_lock() \
  26 ({      unsigned long flags; \
  27         spin_lock_irqsave(&dma_spin_lock, flags); \
  28         flags; \
  29 })
  30
  31 #define release_dma_lock(__flags) \
  32         spin_unlock_irqrestore(&dma_spin_lock, __flags);
  33
  34 static struct sparc_ebus_info {
  35         struct ebus_dma_info info;
  36         unsigned int addr;
  37         unsigned int count;
  38         int lock;
  39
  40         struct parport *port;
  41 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  42
  43 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
  44
  45 static inline int request_dma(unsigned int dmanr, const char *device_id)
  46 {
  47         if (dmanr >= PARPORT_PC_MAX_PORTS)
  48                 return -EINVAL;
  49         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  50                 return -EBUSY;
  51         return 0;
  52 }
  53
  54 static inline void free_dma(unsigned int dmanr)
  55 {
  56         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  57                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  58                 return;
  59         }
  60         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  61                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  62                 return;
  63         }
  64 }
  65
  66 static inline void enable_dma(unsigned int dmanr)
  67 {
  68         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  69
  70         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  71                              sparc_ebus_dmas[dmanr].addr,
  72                              sparc_ebus_dmas[dmanr].count))
  73                 BUG();
  74 }
  75
  76 static inline void disable_dma(unsigned int dmanr)
  77 {
  78         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  79 }
  80
  81 static inline void clear_dma_ff(unsigned int dmanr)
  82 {
  83         /* nothing */
  84 }
  85
  86 static inline void set_dma_mode(unsigned int dmanr, char mode)
  87 {
  88         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  89 }
  90
  91 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
  92 {
  93         sparc_ebus_dmas[dmanr].addr = addr;
  94 }
  95
  96 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
  97 {
  98         sparc_ebus_dmas[dmanr].count = count;
  99 }
 100
 101 static inline unsigned int get_dma_residue(unsigned int dmanr)
 102 {
 103         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
 104 }
 105
 106 static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match)
 107 {
 108         unsigned long base = op->resource[0].start;
 109         unsigned long config = op->resource[1].start;
 110         unsigned long d_base = op->resource[2].start;
 111         unsigned long d_len;
 112         struct device_node *parent;
 113         struct parport *p;
 114         int slot, err;
 115
 116         parent = op->node->parent;
 117         if (!strcmp(parent->name, "dma")) {
 118                 p = parport_pc_probe_port(base, base + 0x400,
 119                                           op->irqs[0], PARPORT_DMA_NOFIFO,
 120                                           op->dev.parent->parent);
 121                 if (!p)
 122                         return -ENOMEM;
 123                 dev_set_drvdata(&op->dev, p);
 124                 return 0;
 125         }
 126
 127         for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
 128                 if (!test_and_set_bit(slot, dma_slot_map))
 129                         break;
 130         }
 131         err = -ENODEV;
 132         if (slot >= PARPORT_PC_MAX_PORTS)
 133                 goto out_err;
 134
 135         spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
 136
 137         d_len = (op->resource[2].end - d_base) + 1UL;
 138         sparc_ebus_dmas[slot].info.regs =
 139                 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
 140
 141         if (!sparc_ebus_dmas[slot].info.regs)
 142                 goto out_clear_map;
 143
 144         sparc_ebus_dmas[slot].info.flags = 0;
 145         sparc_ebus_dmas[slot].info.callback = NULL;
 146         sparc_ebus_dmas[slot].info.client_cookie = NULL;
 147         sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
 148         strcpy(sparc_ebus_dmas[slot].info.name, "parport");
 149         if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
 150                 goto out_unmap_regs;
 151
 152         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].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         p = parport_pc_probe_port(base, base + 0x400,
 169                                   op->irqs[0],
 170                                   slot,
 171                                   op->dev.parent);
 172         err = -ENOMEM;
 173         if (!p)
 174                 goto out_disable_irq;
 175
 176         dev_set_drvdata(&op->dev, p);
 177
 178         return 0;
 179
 180 out_disable_irq:
 181         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 182         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 183
 184 out_unmap_regs:
 185         of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
 186
 187 out_clear_map:
 188         clear_bit(slot, dma_slot_map);
 189
 190 out_err:
 191         return err;
 192 }
 193
 194 static int __devexit ecpp_remove(struct of_device *op)
 195 {
 196         struct parport *p = dev_get_drvdata(&op->dev);
 197         int slot = p->dma;
 198
 199         parport_pc_unregister_port(p);
 200
 201         if (slot != PARPORT_DMA_NOFIFO) {
 202                 unsigned long d_base = op->resource[2].start;
 203                 unsigned long d_len;
 204
 205                 d_len = (op->resource[2].end - d_base) + 1UL;
 206
 207                 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 208                 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 209                 of_iounmap(&op->resource[2],
 210                            sparc_ebus_dmas[slot].info.regs,
 211                            d_len);
 212                 clear_bit(slot, dma_slot_map);
 213         }
 214
 215         return 0;
 216 }
 217
 218 static struct of_device_id ecpp_match[] = {
 219         {
 220                 .name = "ecpp",
 221         },
 222         {
 223                 .name = "parallel",
 224                 .compatible = "ecpp",
 225         },
 226         {
 227                 .name = "parallel",
 228                 .compatible = "ns87317-ecpp",
 229         },
 230         {},
 231 };
 232
 233 static struct of_platform_driver ecpp_driver = {
 234         .name                   = "ecpp",
 235         .match_table            = ecpp_match,
 236         .probe                  = ecpp_probe,
 237         .remove                 = __devexit_p(ecpp_remove),
 238 };
 239
 240 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
 241 {
 242         of_register_driver(&ecpp_driver, &of_bus_type);
 243
 244         return 0;
 245 }
 246
 247 #endif /* !(_ASM_SPARC64_PARPORT_H */