arch/sparc/include/asm/parport.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   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 <linux/of_device.h>
  11
  12 #include <asm/ebus_dma.h>
  13 #include <asm/ns87303.h>
  14 #include <asm/prom.h>
  15
  16 #define PARPORT_PC_MAX_PORTS    PARPORT_MAX
  17
  18 /*
  19  * While sparc64 doesn't have an ISA DMA API, we provide something that looks
  20  * close enough to make parport_pc happy
  21  */
  22 #define HAS_DMA
  23
  24 #ifdef CONFIG_PARPORT_PC_FIFO
  25 static DEFINE_SPINLOCK(dma_spin_lock);
  26
  27 #define claim_dma_lock() \
  28 ({      unsigned long flags; \
  29         spin_lock_irqsave(&dma_spin_lock, flags); \
  30         flags; \
  31 })
  32
  33 #define release_dma_lock(__flags) \
  34         spin_unlock_irqrestore(&dma_spin_lock, __flags);
  35 #endif
  36
  37 static struct sparc_ebus_info {
  38         struct ebus_dma_info info;
  39         unsigned int addr;
  40         unsigned int count;
  41         int lock;
  42
  43         struct parport *port;
  44 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  45
  46 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
  47
  48 static inline int request_dma(unsigned int dmanr, const char *device_id)
  49 {
  50         if (dmanr >= PARPORT_PC_MAX_PORTS)
  51                 return -EINVAL;
  52         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  53                 return -EBUSY;
  54         return 0;
  55 }
  56
  57 static inline void free_dma(unsigned int dmanr)
  58 {
  59         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  60                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  61                 return;
  62         }
  63         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  64                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  65                 return;
  66         }
  67 }
  68
  69 static inline void enable_dma(unsigned int dmanr)
  70 {
  71         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  72
  73         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  74                              sparc_ebus_dmas[dmanr].addr,
  75                              sparc_ebus_dmas[dmanr].count))
  76                 BUG();
  77 }
  78
  79 static inline void disable_dma(unsigned int dmanr)
  80 {
  81         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  82 }
  83
  84 static inline void clear_dma_ff(unsigned int dmanr)
  85 {
  86         /* nothing */
  87 }
  88
  89 static inline void set_dma_mode(unsigned int dmanr, char mode)
  90 {
  91         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  92 }
  93
  94 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
  95 {
  96         sparc_ebus_dmas[dmanr].addr = addr;
  97 }
  98
  99 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
 100 {
 101         sparc_ebus_dmas[dmanr].count = count;
 102 }
 103
 104 static inline unsigned int get_dma_residue(unsigned int dmanr)
 105 {
 106         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
 107 }
 108
 109 static int ecpp_probe(struct platform_device *op)
 110 {
 111         unsigned long base = op->resource[0].start;
 112         unsigned long config = op->resource[1].start;
 113         unsigned long d_base = op->resource[2].start;
 114         unsigned long d_len;
 115         struct device_node *parent;
 116         struct parport *p;
 117         int slot, err;
 118
 119         parent = op->dev.of_node->parent;
 120         if (of_node_name_eq(parent, "dma")) {
 121                 p = parport_pc_probe_port(base, base + 0x400,
 122                                           op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
 123                                           op->dev.parent->parent, 0);
 124                 if (!p)
 125                         return -ENOMEM;
 126                 dev_set_drvdata(&op->dev, p);
 127                 return 0;
 128         }
 129
 130         for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
 131                 if (!test_and_set_bit(slot, dma_slot_map))
 132                         break;
 133         }
 134         err = -ENODEV;
 135         if (slot >= PARPORT_PC_MAX_PORTS)
 136                 goto out_err;
 137
 138         spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
 139
 140         d_len = (op->resource[2].end - d_base) + 1UL;
 141         sparc_ebus_dmas[slot].info.regs =
 142                 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
 143
 144         if (!sparc_ebus_dmas[slot].info.regs)
 145                 goto out_clear_map;
 146
 147         sparc_ebus_dmas[slot].info.flags = 0;
 148         sparc_ebus_dmas[slot].info.callback = NULL;
 149         sparc_ebus_dmas[slot].info.client_cookie = NULL;
 150         sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
 151         strcpy(sparc_ebus_dmas[slot].info.name, "parport");
 152         if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
 153                 goto out_unmap_regs;
 154
 155         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
 156
 157         /* Configure IRQ to Push Pull, Level Low */
 158         /* Enable ECP, set bit 2 of the CTR first */
 159         outb(0x04, base + 0x02);
 160         ns87303_modify(config, PCR,
 161                        PCR_EPP_ENABLE |
 162                        PCR_IRQ_ODRAIN,
 163                        PCR_ECP_ENABLE |
 164                        PCR_ECP_CLK_ENA |
 165                        PCR_IRQ_POLAR);
 166
 167         /* CTR bit 5 controls direction of port */
 168         ns87303_modify(config, PTR,
 169                        0, PTR_LPT_REG_DIR);
 170
 171         p = parport_pc_probe_port(base, base + 0x400,
 172                                   op->archdata.irqs[0],
 173                                   slot,
 174                                   op->dev.parent,
 175                                   0);
 176         err = -ENOMEM;
 177         if (!p)
 178                 goto out_disable_irq;
 179
 180         dev_set_drvdata(&op->dev, p);
 181
 182         return 0;
 183
 184 out_disable_irq:
 185         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 186         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 187
 188 out_unmap_regs:
 189         of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
 190
 191 out_clear_map:
 192         clear_bit(slot, dma_slot_map);
 193
 194 out_err:
 195         return err;
 196 }
 197
 198 static int ecpp_remove(struct platform_device *op)
 199 {
 200         struct parport *p = dev_get_drvdata(&op->dev);
 201         int slot = p->dma;
 202
 203         parport_pc_unregister_port(p);
 204
 205         if (slot != PARPORT_DMA_NOFIFO) {
 206                 unsigned long d_base = op->resource[2].start;
 207                 unsigned long d_len;
 208
 209                 d_len = (op->resource[2].end - d_base) + 1UL;
 210
 211                 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 212                 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 213                 of_iounmap(&op->resource[2],
 214                            sparc_ebus_dmas[slot].info.regs,
 215                            d_len);
 216                 clear_bit(slot, dma_slot_map);
 217         }
 218
 219         return 0;
 220 }
 221
 222 static const struct of_device_id ecpp_match[] = {
 223         {
 224                 .name = "ecpp",
 225         },
 226         {
 227                 .name = "parallel",
 228                 .compatible = "ecpp",
 229         },
 230         {
 231                 .name = "parallel",
 232                 .compatible = "ns87317-ecpp",
 233         },
 234         {
 235                 .name = "parallel",
 236                 .compatible = "pnpALI,1533,3",
 237         },
 238         {},
 239 };
 240
 241 static struct platform_driver ecpp_driver = {
 242         .driver = {
 243                 .name = "ecpp",
 244                 .of_match_table = ecpp_match,
 245         },
 246         .probe                  = ecpp_probe,
 247         .remove                 = ecpp_remove,
 248 };
 249
 250 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
 251 {
 252         return platform_driver_register(&ecpp_driver);
 253 }
 254
 255 #endif /* !(_ASM_SPARC64_PARPORT_H */