/* parport.h: sparc64 specific parport initialization and dma.
*
* Copyright (C) 1999 Eddie C. Dost ([email protected])
*/

#ifndef _ASM_SPARC64_PARPORT_H
#define _ASM_SPARC64_PARPORT_H 1

#include <linux/of_device.h>

#include <asm/ebus_dma.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 ecpp_probe(struct platform_device *op)
{
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->dev.of_node->parent;
if (!strcmp(parent->name, "dma")) {
p = parport_pc_probe_port(base, base + 0x400,
op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
op->dev.parent->parent, 0);
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->archdata.irqs[0],
slot,
op->dev.parent,
0);
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 ecpp_remove(struct platform_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 const struct of_device_id ecpp_match[] = {
{
.name = "ecpp",
},
{
.name = "parallel",
.compatible = "ecpp",
},
{
.name = "parallel",
.compatible = "ns87317-ecpp",
},
{
.name = "parallel",
.compatible = "pnpALI,1533,3",
},
{},
};

static struct platform_driver ecpp_driver = {
.driver = {
.name = "ecpp",
.owner = THIS_MODULE,
.of_match_table = ecpp_match,
},
.probe = ecpp_probe,
.remove = ecpp_remove,
};

static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
{
return platform_driver_register(&ecpp_driver);
}

#endif /* !(_ASM_SPARC64_PARPORT_H */