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/* $Id: parport.h,v 1.1.1.1 2004-04-15 03:00:53 phoenix Exp $
 * 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 <asm/ebus.h>
#include <asm/isa.h>
#include <asm/ns87303.h>
 
#define PARPORT_PC_MAX_PORTS	PARPORT_MAX
 
static struct linux_ebus_dma *sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
 
static __inline__ void
reset_dma(unsigned int dmanr)
{
	unsigned int dcsr;
 
	writel(EBUS_DCSR_RESET, &sparc_ebus_dmas[dmanr]->dcsr);
	udelay(1);
	dcsr = EBUS_DCSR_BURST_SZ_16 | EBUS_DCSR_TCI_DIS |
	       EBUS_DCSR_EN_CNT | EBUS_DCSR_INT_EN;
	writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
}
 
static __inline__ void
enable_dma(unsigned int dmanr)
{
	unsigned int dcsr;
 
	dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
	dcsr |= EBUS_DCSR_EN_DMA;
	writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
}
 
static __inline__ void
disable_dma(unsigned int dmanr)
{
	unsigned int dcsr;
 
	dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
	if (dcsr & EBUS_DCSR_EN_DMA) {
		while (dcsr & EBUS_DCSR_DRAIN) {
			udelay(1);
			dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
		}
		dcsr &= ~(EBUS_DCSR_EN_DMA);
		writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
 
		dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
		if (dcsr & EBUS_DCSR_ERR_PEND)
			reset_dma(dmanr);
	}
}
 
static __inline__ void
clear_dma_ff(unsigned int dmanr)
{
	/* nothing */
}
 
static __inline__ void
set_dma_mode(unsigned int dmanr, char mode)
{
	unsigned int dcsr;
 
	dcsr = readl(&sparc_ebus_dmas[dmanr]->dcsr);
	dcsr |= EBUS_DCSR_EN_CNT | EBUS_DCSR_TC;
	if (mode == DMA_MODE_WRITE)
		dcsr &= ~(EBUS_DCSR_WRITE);
	else
		dcsr |= EBUS_DCSR_WRITE;
	writel(dcsr, &sparc_ebus_dmas[dmanr]->dcsr);
}
 
static __inline__ void
set_dma_addr(unsigned int dmanr, unsigned int addr)
{
	writel(addr, &sparc_ebus_dmas[dmanr]->dacr);
}
 
static __inline__ void
set_dma_count(unsigned int dmanr, unsigned int count)
{
	writel(count, &sparc_ebus_dmas[dmanr]->dbcr);
}
 
static __inline__ int
get_dma_residue(unsigned int dmanr)
{
	int res;
 
	res = readl(&sparc_ebus_dmas[dmanr]->dbcr);
	if (res != 0)
		reset_dma(dmanr);
	return res;
}
 
static int ebus_ecpp_p(struct linux_ebus_device *edev)
{
	if (!strcmp(edev->prom_name, "ecpp"))
		return 1;
	if (!strcmp(edev->prom_name, "parallel")) {
		char compat[19];
		prom_getstring(edev->prom_node,
			       "compatible",
			       compat, sizeof(compat));
		compat[18] = '\0';
		if (!strcmp(compat, "ecpp"))
			return 1;
		if (!strcmp(compat, "ns87317-ecpp") &&
		    !strcmp(compat + 13, "ecpp"))
			return 1;
	}
	return 0;
}
 
static int parport_isa_probe(int count)
{
	struct isa_bridge *isa_br;
	struct isa_device *isa_dev;
 
	for_each_isa(isa_br) {
		for_each_isadev(isa_dev, isa_br) {
			struct isa_device *child;
			unsigned long base;
 
			if (strcmp(isa_dev->prom_name, "dma"))
				continue;
 
			child = isa_dev->child;
			while (child) {
				if (!strcmp(child->prom_name, "parallel"))
					break;
				child = child->next;
			}
			if (!child)
				continue;
 
			base = child->resource.start;
 
			/* No DMA, see commentary in
			 * asm-sparc64/floppy.h:isa_floppy_init()
			 */
			if (parport_pc_probe_port(base, base + 0x400,
						  child->irq, PARPORT_DMA_NOFIFO,
						  child->bus->self))
				count++;
		}
	}
 
	return count;
}
 
static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
{
	struct linux_ebus *ebus;
	struct linux_ebus_device *edev;
	int count = 0;
 
	if (!pci_present())
		return 0;
 
	for_each_ebus(ebus) {
		for_each_ebusdev(edev, ebus) {
			if (ebus_ecpp_p(edev)) {
				unsigned long base = edev->resource[0].start;
				unsigned long config = edev->resource[1].start;
 
				sparc_ebus_dmas[count] =
						(struct linux_ebus_dma *)
							edev->resource[2].start;
				reset_dma(count);
 
				/* 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);
 
				if (parport_pc_probe_port(base, base + 0x400,
							  edev->irqs[0],
							  count, ebus->self))
					count++;
			}
		}
	}
 
	count = parport_isa_probe(count);
 
	return count;
}
 
#endif /* !(_ASM_SPARC64_PARPORT_H */