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/*
* linux/arch/arm/mach-pxa/cm-x270-pci.c
*
* PCI bios-type initialisation for PCI machines
*
* Bits taken from various places.
*
* Copyright (C) 2007, 2008 Compulab, Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* 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 <linux/gpio.h>
#include <asm/mach/pci.h>
#include <asm/arch/pxa-regs.h>
#include <asm/mach-types.h>
#include <asm/hardware/it8152.h>
unsigned long it8152_base_address;
static int cmx270_it8152_irq_gpio;
/*
* 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;
if (machine_is_armcore()) {
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(cmx270_it8152_irq_gpio) = GPIO_bit(cmx270_it8152_irq_gpio);
it8152_irq_demux(irq, desc);
}
void __cmx270_pci_init_irq(int irq_gpio)
{
it8152_init_irq();
cmx270_it8152_irq_gpio = irq_gpio;
set_irq_type(gpio_to_irq(irq_gpio), IRQT_RISING);
set_irq_chained_handler(gpio_to_irq(irq_gpio), 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", __func__, 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);
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