cm-x270-pci.c

linux 内核源代码

/*
 * linux/arch/arm/mach-pxa/cm-x270-pci.c
 *
 * PCI bios-type initialisation for PCI machines
 *
 * Bits taken from various places.
 *
 * Copyright (C) 2007 Compulab, Ltd.
 * Mike Rapoport <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/irq.h>

#include <asm/mach/pci.h>
#include <asm/arch/cm-x270.h>
#include <asm/arch/pxa-regs.h>
#include <asm/mach-types.h>

#include <asm/hardware/it8152.h>

unsigned long it8152_base_address = CMX270_IT8152_VIRT;

/*
 * Only first 64MB of memory can be accessed via PCI.
 * We use GFP_DMA to allocate safe buffers to do map/unmap.
 * This is really ugly and we need a better way of specifying
 * DMA-capable regions of memory.
 */
void __init cmx270_pci_adjust_zones(int node, unsigned long *zone_size,
	unsigned long *zhole_size)
{
	unsigned int sz = SZ_64M >> PAGE_SHIFT;

	pr_info("Adjusting zones for CM-x270\n");

	/*
	 * Only adjust if > 64M on current system
	 */
	if (node || (zone_size[0] <= sz))
		return;

	zone_size[1] = zone_size[0] - sz;
	zone_size[0] = sz;
	zhole_size[1] = zhole_size[0];
	zhole_size[0] = 0;
}

static void cmx270_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
{
	/* clear our parent irq */
	GEDR(GPIO_IT8152_IRQ) = GPIO_bit(GPIO_IT8152_IRQ);

	it8152_irq_demux(irq, desc);
}

void __cmx270_pci_init_irq(void)
{
	it8152_init_irq();
	pxa_gpio_mode(IRQ_TO_GPIO(GPIO_IT8152_IRQ));
	set_irq_type(IRQ_GPIO(GPIO_IT8152_IRQ), IRQT_RISING);

	set_irq_chained_handler(IRQ_GPIO(GPIO_IT8152_IRQ),
				cmx270_it8152_irq_demux);
}

#ifdef CONFIG_PM
static unsigned long sleep_save_ite[10];

void __cmx270_pci_suspend(void)
{
	/* save ITE state */
	sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
	sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
	sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);

	/* Clear ITE IRQ's */
	__raw_writel((0), IT8152_INTC_PDCNIRR);
	__raw_writel((0), IT8152_INTC_LPCNIRR);
}

void __cmx270_pci_resume(void)
{
	/* restore IT8152 state */
	__raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
	__raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
	__raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
}
#else
void cmx270_pci_suspend(void) {}
void cmx270_pci_resume(void) {}
#endif

/* PCI IRQ mapping*/
static int __init cmx270_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
	int irq;

	dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __FUNCTION__, slot, pin);

	irq = it8152_pci_map_irq(dev, slot, pin);
	if (irq)
		return irq;

	/*
	  Here comes the ugly part. The routing is baseboard specific,
	  but defining a platform for each possible base of CM-x270 is
	  unrealistic. Here we keep mapping for ATXBase and SB-x270.
	*/
	/* ATXBASE PCI slot */
	if (slot == 7)
		return IT8152_PCI_INTA;

	/* ATXBase/SB-x270 CardBus */
	if (slot == 8 || slot == 0)
		return IT8152_PCI_INTB;

	/* ATXBase Ethernet */
	if (slot == 9)
		return IT8152_PCI_INTA;

	/* SB-x270 Ethernet */
	if (slot == 16)
		return IT8152_PCI_INTA;

	/* PC104+ interrupt routing */
	if ((slot == 17) || (slot == 19))
		return IT8152_PCI_INTA;
	if ((slot == 18) || (slot == 20))
		return IT8152_PCI_INTB;

	return(0);
}

static void cmx270_pci_preinit(void)
{
	pr_info("Initializing CM-X270 PCI subsystem\n");

	__raw_writel(0x800, IT8152_PCI_CFG_ADDR);
	if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
		pr_info("PCI Bridge found.\n");

		/* set PCI I/O base at 0 */
		writel(0x848, IT8152_PCI_CFG_ADDR);
		writel(0, IT8152_PCI_CFG_DATA);

		/* set PCI memory base at 0 */
		writel(0x840, IT8152_PCI_CFG_ADDR);
		writel(0, IT8152_PCI_CFG_DATA);

		writel(0x20, IT8152_GPIO_GPDR);

		/* CardBus Controller on ATXbase baseboard */
		writel(0x4000, IT8152_PCI_CFG_ADDR);
		if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
			pr_info("CardBus Bridge found.\n");

			/* Configure socket 0 */
			writel(0x408C, IT8152_PCI_CFG_ADDR);
			writel(0x1022, IT8152_PCI_CFG_DATA);

			writel(0x4080, IT8152_PCI_CFG_ADDR);
			writel(0x3844d060, IT8152_PCI_CFG_DATA);

			writel(0x4090, IT8152_PCI_CFG_ADDR);
			writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
				0x60440000),
			       IT8152_PCI_CFG_DATA);

			writel(0x4018, IT8152_PCI_CFG_ADDR);
			writel(0xb0000000, IT8152_PCI_CFG_DATA);

			/* Configure socket 1 */
			writel(0x418C, IT8152_PCI_CFG_ADDR);
			writel(0x1022, IT8152_PCI_CFG_DATA);

			writel(0x4180, IT8152_PCI_CFG_ADDR);
			writel(0x3844d060, IT8152_PCI_CFG_DATA);

			writel(0x4190, IT8152_PCI_CFG_ADDR);
			writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
				0x60440000),
			       IT8152_PCI_CFG_DATA);

			writel(0x4118, IT8152_PCI_CFG_ADDR);
			writel(0xb0000000, IT8152_PCI_CFG_DATA);
		}
	}
}

static struct hw_pci cmx270_pci __initdata = {
	.swizzle	= pci_std_swizzle,
	.map_irq	= cmx270_pci_map_irq,
	.nr_controllers	= 1,
	.setup		= it8152_pci_setup,
	.scan		= it8152_pci_scan_bus,
	.preinit	= cmx270_pci_preinit,
};

static int __init cmx270_init_pci(void)
{
	if (machine_is_armcore())
		pci_common_init(&cmx270_pci);

	return 0;
}

subsys_initcall(cmx270_init_pci);