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   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 <asm/ebus.h>
  10 #include <asm/ns87303.h>
  11 #include <asm/of_device.h>
  12 #include <asm/prom.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
  39         struct parport *port;
  40 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  41
  42 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
  43
  44 static inline int request_dma(unsigned int dmanr, const char *device_id)
  45 {
  46         if (dmanr >= PARPORT_PC_MAX_PORTS)
  47                 return -EINVAL;
  48         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  49                 return -EBUSY;
  50         return 0;
  51 }
  52
  53 static inline void free_dma(unsigned int dmanr)
  54 {
  55         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  56                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  57                 return;
  58         }
  59         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  60                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  61                 return;
  62         }
  63 }
  64
  65 static inline void enable_dma(unsigned int dmanr)
  66 {
  67         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  68
  69         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  70                              sparc_ebus_dmas[dmanr].addr,
  71                              sparc_ebus_dmas[dmanr].count))
  72                 BUG();
  73 }
  74
  75 static inline void disable_dma(unsigned int dmanr)
  76 {
  77         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  78 }
  79
  80 static inline void clear_dma_ff(unsigned int dmanr)
  81 {
  82         /* nothing */
  83 }
  84
  85 static inline void set_dma_mode(unsigned int dmanr, char mode)
  86 {
  87         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  88 }
  89
  90 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
  91 {
  92         sparc_ebus_dmas[dmanr].addr = addr;
  93 }
  94
  95 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
  96 {
  97         sparc_ebus_dmas[dmanr].count = count;
  98 }
  99
 100 static inline unsigned int get_dma_residue(unsigned int dmanr)
 101 {
 102         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
 103 }
 104
 105 static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match)
 106 {
 107         unsigned long base = op->resource[0].start;
 108         unsigned long config = op->resource[1].start;
 109         unsigned long d_base = op->resource[2].start;
 110         unsigned long d_len;
 111         struct device_node *parent;
 112         struct parport *p;
 113         int slot, err;
 114
 115         parent = op->node->parent;
 116         if (!strcmp(parent->name, "dma")) {
 117                 p = parport_pc_probe_port(base, base + 0x400,
 118                                           op->irqs[0], PARPORT_DMA_NOFIFO,
 119                                           op->dev.parent->parent);
 120                 if (!p)
 121                         return -ENOMEM;
 122                 dev_set_drvdata(&op->dev, p);
 123                 return 0;
 124         }
 125
 126         for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
 127                 if (!test_and_set_bit(slot, dma_slot_map))
 128                         break;
 129         }
 130         err = -ENODEV;
 131         if (slot >= PARPORT_PC_MAX_PORTS)
 132                 goto out_err;
 133
 134         spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
 135
 136         d_len = (op->resource[2].end - d_base) + 1UL;
 137         sparc_ebus_dmas[slot].info.regs =
 138                 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
 139
 140         if (!sparc_ebus_dmas[slot].info.regs)
 141                 goto out_clear_map;
 142
 143         sparc_ebus_dmas[slot].info.flags = 0;
 144         sparc_ebus_dmas[slot].info.callback = NULL;
 145         sparc_ebus_dmas[slot].info.client_cookie = NULL;
 146         sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
 147         strcpy(sparc_ebus_dmas[slot].info.name, "parport");
 148         if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
 149                 goto out_unmap_regs;
 150
 151         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
 152
 153         /* Configure IRQ to Push Pull, Level Low */
 154         /* Enable ECP, set bit 2 of the CTR first */
 155         outb(0x04, base + 0x02);
 156         ns87303_modify(config, PCR,
 157                        PCR_EPP_ENABLE |
 158                        PCR_IRQ_ODRAIN,
 159                        PCR_ECP_ENABLE |
 160                        PCR_ECP_CLK_ENA |
 161                        PCR_IRQ_POLAR);
 162
 163         /* CTR bit 5 controls direction of port */
 164         ns87303_modify(config, PTR,
 165                        0, PTR_LPT_REG_DIR);
 166
 167         p = parport_pc_probe_port(base, base + 0x400,
 168                                   op->irqs[0],
 169                                   slot,
 170                                   op->dev.parent);
 171         err = -ENOMEM;
 172         if (!p)
 173                 goto out_disable_irq;
 174
 175         dev_set_drvdata(&op->dev, p);
 176
 177         return 0;
 178
 179 out_disable_irq:
 180         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 181         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 182
 183 out_unmap_regs:
 184         of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
 185
 186 out_clear_map:
 187         clear_bit(slot, dma_slot_map);
 188
 189 out_err:
 190         return err;
 191 }
 192
 193 static int __devexit ecpp_remove(struct of_device *op)
 194 {
 195         struct parport *p = dev_get_drvdata(&op->dev);
 196         int slot = p->dma;
 197
 198         parport_pc_unregister_port(p);
 199
 200         if (slot != PARPORT_DMA_NOFIFO) {
 201                 unsigned long d_base = op->resource[2].start;
 202                 unsigned long d_len;
 203
 204                 d_len = (op->resource[2].end - d_base) + 1UL;
 205
 206                 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 207                 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 208                 of_iounmap(&op->resource[2],
 209                            sparc_ebus_dmas[slot].info.regs,
 210                            d_len);
 211                 clear_bit(slot, dma_slot_map);
 212         }
 213
 214         return 0;
 215 }
 216
 217 static struct of_device_id ecpp_match[] = {
 218         {
 219                 .name = "ecpp",
 220         },
 221         {
 222                 .name = "parallel",
 223                 .compatible = "ecpp",
 224         },
 225         {
 226                 .name = "parallel",
 227                 .compatible = "ns87317-ecpp",
 228         },
 229         {},
 230 };
 231
 232 static struct of_platform_driver ecpp_driver = {
 233         .name                   = "ecpp",
 234         .match_table            = ecpp_match,
 235         .probe                  = ecpp_probe,
 236         .remove                 = __devexit_p(ecpp_remove),
 237 };
 238
 239 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
 240 {
 241         of_register_driver(&ecpp_driver, &of_bus_type);
 242
 243         return 0;
 244 }
 245
 246 #endif /* !(_ASM_SPARC64_PARPORT_H */