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 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
  35 static struct sparc_ebus_info {
  36         struct ebus_dma_info info;
  37         unsigned int addr;
  38         unsigned int count;
  39         int lock;
  40
  41         struct parport *port;
  42 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
  43
  44 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
  45
  46 static inline int request_dma(unsigned int dmanr, const char *device_id)
  47 {
  48         if (dmanr >= PARPORT_PC_MAX_PORTS)
  49                 return -EINVAL;
  50         if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
  51                 return -EBUSY;
  52         return 0;
  53 }
  54
  55 static inline void free_dma(unsigned int dmanr)
  56 {
  57         if (dmanr >= PARPORT_PC_MAX_PORTS) {
  58                 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
  59                 return;
  60         }
  61         if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
  62                 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
  63                 return;
  64         }
  65 }
  66
  67 static inline void enable_dma(unsigned int dmanr)
  68 {
  69         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
  70
  71         if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
  72                              sparc_ebus_dmas[dmanr].addr,
  73                              sparc_ebus_dmas[dmanr].count))
  74                 BUG();
  75 }
  76
  77 static inline void disable_dma(unsigned int dmanr)
  78 {
  79         ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
  80 }
  81
  82 static inline void clear_dma_ff(unsigned int dmanr)
  83 {
  84         /* nothing */
  85 }
  86
  87 static inline void set_dma_mode(unsigned int dmanr, char mode)
  88 {
  89         ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
  90 }
  91
  92 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
  93 {
  94         sparc_ebus_dmas[dmanr].addr = addr;
  95 }
  96
  97 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
  98 {
  99         sparc_ebus_dmas[dmanr].count = count;
 100 }
 101
 102 static inline unsigned int get_dma_residue(unsigned int dmanr)
 103 {
 104         return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
 105 }
 106
 107 static int ecpp_probe(struct platform_device *op)
 108 {
 109         unsigned long base = op->resource[0].start;
 110         unsigned long config = op->resource[1].start;
 111         unsigned long d_base = op->resource[2].start;
 112         unsigned long d_len;
 113         struct device_node *parent;
 114         struct parport *p;
 115         int slot, err;
 116
 117         parent = op->dev.of_node->parent;
 118         if (!strcmp(parent->name, "dma")) {
 119                 p = parport_pc_probe_port(base, base + 0x400,
 120                                           op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
 121                                           op->dev.parent->parent, 0);
 122                 if (!p)
 123                         return -ENOMEM;
 124                 dev_set_drvdata(&op->dev, p);
 125                 return 0;
 126         }
 127
 128         for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
 129                 if (!test_and_set_bit(slot, dma_slot_map))
 130                         break;
 131         }
 132         err = -ENODEV;
 133         if (slot >= PARPORT_PC_MAX_PORTS)
 134                 goto out_err;
 135
 136         spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
 137
 138         d_len = (op->resource[2].end - d_base) + 1UL;
 139         sparc_ebus_dmas[slot].info.regs =
 140                 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
 141
 142         if (!sparc_ebus_dmas[slot].info.regs)
 143                 goto out_clear_map;
 144
 145         sparc_ebus_dmas[slot].info.flags = 0;
 146         sparc_ebus_dmas[slot].info.callback = NULL;
 147         sparc_ebus_dmas[slot].info.client_cookie = NULL;
 148         sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
 149         strcpy(sparc_ebus_dmas[slot].info.name, "parport");
 150         if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
 151                 goto out_unmap_regs;
 152
 153         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
 154
 155         /* Configure IRQ to Push Pull, Level Low */
 156         /* Enable ECP, set bit 2 of the CTR first */
 157         outb(0x04, base + 0x02);
 158         ns87303_modify(config, PCR,
 159                        PCR_EPP_ENABLE |
 160                        PCR_IRQ_ODRAIN,
 161                        PCR_ECP_ENABLE |
 162                        PCR_ECP_CLK_ENA |
 163                        PCR_IRQ_POLAR);
 164
 165         /* CTR bit 5 controls direction of port */
 166         ns87303_modify(config, PTR,
 167                        0, PTR_LPT_REG_DIR);
 168
 169         p = parport_pc_probe_port(base, base + 0x400,
 170                                   op->archdata.irqs[0],
 171                                   slot,
 172                                   op->dev.parent,
 173                                   0);
 174         err = -ENOMEM;
 175         if (!p)
 176                 goto out_disable_irq;
 177
 178         dev_set_drvdata(&op->dev, p);
 179
 180         return 0;
 181
 182 out_disable_irq:
 183         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 184         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 185
 186 out_unmap_regs:
 187         of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
 188
 189 out_clear_map:
 190         clear_bit(slot, dma_slot_map);
 191
 192 out_err:
 193         return err;
 194 }
 195
 196 static int ecpp_remove(struct platform_device *op)
 197 {
 198         struct parport *p = dev_get_drvdata(&op->dev);
 199         int slot = p->dma;
 200
 201         parport_pc_unregister_port(p);
 202
 203         if (slot != PARPORT_DMA_NOFIFO) {
 204                 unsigned long d_base = op->resource[2].start;
 205                 unsigned long d_len;
 206
 207                 d_len = (op->resource[2].end - d_base) + 1UL;
 208
 209                 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
 210                 ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
 211                 of_iounmap(&op->resource[2],
 212                            sparc_ebus_dmas[slot].info.regs,
 213                            d_len);
 214                 clear_bit(slot, dma_slot_map);
 215         }
 216
 217         return 0;
 218 }
 219
 220 static const struct of_device_id ecpp_match[] = {
 221         {
 222                 .name = "ecpp",
 223         },
 224         {
 225                 .name = "parallel",
 226                 .compatible = "ecpp",
 227         },
 228         {
 229                 .name = "parallel",
 230                 .compatible = "ns87317-ecpp",
 231         },
 232         {
 233                 .name = "parallel",
 234                 .compatible = "pnpALI,1533,3",
 235         },
 236         {},
 237 };
 238
 239 static struct platform_driver ecpp_driver = {
 240         .driver = {
 241                 .name = "ecpp",
 242                 .of_match_table = ecpp_match,
 243         },
 244         .probe                  = ecpp_probe,
 245         .remove                 = ecpp_remove,
 246 };
 247
 248 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
 249 {
 250         return platform_driver_register(&ecpp_driver);
 251 }
 252
 253 #endif /* !(_ASM_SPARC64_PARPORT_H */