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