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parport.h

/* parport.h: sparc64 specific parport initialization and dma.
 *
 * Copyright (C) 1999  Eddie C. Dost  (ecd@skynet.be)
 */

#ifndef _ASM_SPARC64_PARPORT_H
#define _ASM_SPARC64_PARPORT_H 1

#include <linux/of_device.h>

#include <asm/ebus.h>
#include <asm/ns87303.h>
#include <asm/prom.h>

#define PARPORT_PC_MAX_PORTS  PARPORT_MAX

/*
 * While sparc64 doesn't have an ISA DMA API, we provide something that looks
 * close enough to make parport_pc happy
 */
#define HAS_DMA

static DEFINE_SPINLOCK(dma_spin_lock);

#define claim_dma_lock() \
({    unsigned long flags; \
      spin_lock_irqsave(&dma_spin_lock, flags); \
      flags; \
})

#define release_dma_lock(__flags) \
      spin_unlock_irqrestore(&dma_spin_lock, __flags);

static struct sparc_ebus_info {
      struct ebus_dma_info info;
      unsigned int addr;
      unsigned int count;
      int lock;

      struct parport *port;
} sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];

static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);

static inline int request_dma(unsigned int dmanr, const char *device_id)
{
      if (dmanr >= PARPORT_PC_MAX_PORTS)
            return -EINVAL;
      if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
            return -EBUSY;
      return 0;
}

static inline void free_dma(unsigned int dmanr)
{
      if (dmanr >= PARPORT_PC_MAX_PORTS) {
            printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
            return;
      }
      if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
            printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
            return;
      }
}

static inline void enable_dma(unsigned int dmanr)
{
      ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);

      if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
                       sparc_ebus_dmas[dmanr].addr,
                       sparc_ebus_dmas[dmanr].count))
            BUG();
}

static inline void disable_dma(unsigned int dmanr)
{
      ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
}

static inline void clear_dma_ff(unsigned int dmanr)
{
      /* nothing */
}

static inline void set_dma_mode(unsigned int dmanr, char mode)
{
      ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
}

static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
{
      sparc_ebus_dmas[dmanr].addr = addr;
}

static inline void set_dma_count(unsigned int dmanr, unsigned int count)
{
      sparc_ebus_dmas[dmanr].count = count;
}

static inline unsigned int get_dma_residue(unsigned int dmanr)
{
      return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
}

static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match)
{
      unsigned long base = op->resource[0].start;
      unsigned long config = op->resource[1].start;
      unsigned long d_base = op->resource[2].start;
      unsigned long d_len;
      struct device_node *parent;
      struct parport *p;
      int slot, err;

      parent = op->node->parent;
      if (!strcmp(parent->name, "dma")) {
            p = parport_pc_probe_port(base, base + 0x400,
                                op->irqs[0], PARPORT_DMA_NOFIFO,
                                op->dev.parent->parent);
            if (!p)
                  return -ENOMEM;
            dev_set_drvdata(&op->dev, p);
            return 0;
      }

      for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
            if (!test_and_set_bit(slot, dma_slot_map))
                  break;
      }
      err = -ENODEV;
      if (slot >= PARPORT_PC_MAX_PORTS)
            goto out_err;

      spin_lock_init(&sparc_ebus_dmas[slot].info.lock);

      d_len = (op->resource[2].end - d_base) + 1UL;
      sparc_ebus_dmas[slot].info.regs =
            of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");

      if (!sparc_ebus_dmas[slot].info.regs)
            goto out_clear_map;

      sparc_ebus_dmas[slot].info.flags = 0;
      sparc_ebus_dmas[slot].info.callback = NULL;
      sparc_ebus_dmas[slot].info.client_cookie = NULL;
      sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
      strcpy(sparc_ebus_dmas[slot].info.name, "parport");
      if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
            goto out_unmap_regs;

      ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);

      /* Configure IRQ to Push Pull, Level Low */
      /* Enable ECP, set bit 2 of the CTR first */
      outb(0x04, base + 0x02);
      ns87303_modify(config, PCR,
                   PCR_EPP_ENABLE |
                   PCR_IRQ_ODRAIN,
                   PCR_ECP_ENABLE |
                   PCR_ECP_CLK_ENA |
                   PCR_IRQ_POLAR);

      /* CTR bit 5 controls direction of port */
      ns87303_modify(config, PTR,
                   0, PTR_LPT_REG_DIR);

      p = parport_pc_probe_port(base, base + 0x400,
                          op->irqs[0],
                          slot,
                          op->dev.parent);
      err = -ENOMEM;
      if (!p)
            goto out_disable_irq;

      dev_set_drvdata(&op->dev, p);

      return 0;

out_disable_irq:
      ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
      ebus_dma_unregister(&sparc_ebus_dmas[slot].info);

out_unmap_regs:
      of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);

out_clear_map:
      clear_bit(slot, dma_slot_map);

out_err:
      return err;
}

static int __devexit ecpp_remove(struct of_device *op)
{
      struct parport *p = dev_get_drvdata(&op->dev);
      int slot = p->dma;

      parport_pc_unregister_port(p);

      if (slot != PARPORT_DMA_NOFIFO) {
            unsigned long d_base = op->resource[2].start;
            unsigned long d_len;

            d_len = (op->resource[2].end - d_base) + 1UL;

            ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
            ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
            of_iounmap(&op->resource[2],
                     sparc_ebus_dmas[slot].info.regs,
                     d_len);
            clear_bit(slot, dma_slot_map);
      }

      return 0;
}

static struct of_device_id ecpp_match[] = {
      {
            .name = "ecpp",
      },
      {
            .name = "parallel",
            .compatible = "ecpp",
      },
      {
            .name = "parallel",
            .compatible = "ns87317-ecpp",
      },
      {},
};

static struct of_platform_driver ecpp_driver = {
      .name             = "ecpp",
      .match_table            = ecpp_match,
      .probe                  = ecpp_probe,
      .remove                 = __devexit_p(ecpp_remove),
};

static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
{
      of_register_driver(&ecpp_driver, &of_bus_type);

      return 0;
}

#endif /* !(_ASM_SPARC64_PARPORT_H */

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