[mirror_ubuntu-bionic-kernel.git] / arch / arm / mach-pxa / cm-x2xx-pci.c

/*
 * linux/arch/arm/mach-pxa/cm-x2xx-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/mach-types.h>

#include <asm/hardware/it8152.h>

unsigned long it8152_base_address;
static int cmx2xx_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 cmx2xx_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-X2XX\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 cmx2xx_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
{
	/* clear our parent irq */
	GEDR(cmx2xx_it8152_irq_gpio) = GPIO_bit(cmx2xx_it8152_irq_gpio);

	it8152_irq_demux(irq, desc);
}

void __cmx2xx_pci_init_irq(int irq_gpio)
{
	it8152_init_irq();

	cmx2xx_it8152_irq_gpio = irq_gpio;

	set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);

	set_irq_chained_handler(gpio_to_irq(irq_gpio), cmx2xx_it8152_irq_demux);
}

#ifdef CONFIG_PM
static unsigned long sleep_save_ite[10];

void __cmx2xx_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 __cmx2xx_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 cmx2xx_pci_suspend(void) {}
void cmx2xx_pci_resume(void) {}
#endif

/* PCI IRQ mapping*/
static int __init cmx2xx_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-X2XX is
	  unrealistic. Here we keep mapping for ATXBase and SB-X2XX.
	*/
	/* ATXBASE PCI slot */
	if (slot == 7)
		return IT8152_PCI_INTA;

	/* ATXBase/SB-X2XX CardBus */
	if (slot == 8 || slot == 0)
		return IT8152_PCI_INTB;

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

	/* CM-x255 Onboard Ethernet */
	if (slot == 15)
		return IT8152_PCI_INTC;

	/* SB-x2xx 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 cmx2xx_pci_preinit(void)
{
	pr_info("Initializing CM-X2XX 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 cmx2xx_pci __initdata = {
	.swizzle	= pci_std_swizzle,
	.map_irq	= cmx2xx_pci_map_irq,
	.nr_controllers	= 1,
	.setup		= it8152_pci_setup,
	.scan		= it8152_pci_scan_bus,
	.preinit	= cmx2xx_pci_preinit,
};

static int __init cmx2xx_init_pci(void)
{
	if (machine_is_armcore())
		pci_common_init(&cmx2xx_pci);

	return 0;
}

subsys_initcall(cmx2xx_init_pci);
Commit	Line	Data
3696a8a4	1	/*
da591937	2	* linux/arch/arm/mach-pxa/cm-x2xx-pci.c
3696a8a4 MR	3	*
	4	* PCI bios-type initialisation for PCI machines
	5	*
	6	* Bits taken from various places.
	7	*
2f01a973	8	* Copyright (C) 2007, 2008 Compulab, Ltd.
3696a8a4 MR	9	* Mike Rapoport <mike@compulab.co.il>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/pci.h>
	18	#include <linux/init.h>
	19	#include <linux/device.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/irq.h>
2f01a973	22	#include <linux/gpio.h>
3696a8a4 MR	23
3696a8a4 MR	24	#include <asm/mach/pci.h>
3696a8a4 MR	25	#include <asm/mach-types.h>
	26
	27	#include <asm/hardware/it8152.h>
	28
2f01a973	29	unsigned long it8152_base_address;
da591937	30	static int cmx2xx_it8152_irq_gpio;
3696a8a4 MR	31
	32	/*
	33	* Only first 64MB of memory can be accessed via PCI.
	34	* We use GFP_DMA to allocate safe buffers to do map/unmap.
	35	* This is really ugly and we need a better way of specifying
	36	* DMA-capable regions of memory.
	37	*/
da591937	38	void __init cmx2xx_pci_adjust_zones(int node, unsigned long *zone_size,
3696a8a4 MR	39	unsigned long *zhole_size)
	40	{
	41	unsigned int sz = SZ_64M >> PAGE_SHIFT;
	42
5855a1e3	43	if (machine_is_armcore()) {
da591937	44	pr_info("Adjusting zones for CM-X2XX\n");
5855a1e3 MR	45
	46	/*
	47	* Only adjust if > 64M on current system
	48	*/
	49	if (node \|\| (zone_size[0] <= sz))
	50	return;
	51
	52	zone_size[1] = zone_size[0] - sz;
	53	zone_size[0] = sz;
	54	zhole_size[1] = zhole_size[0];
	55	zhole_size[0] = 0;
	56	}
3696a8a4 MR	57	}
3696a8a4 MR	58
da591937	59	static void cmx2xx_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
3696a8a4 MR	60	{
3696a8a4 MR	61	/* clear our parent irq */
da591937	62	GEDR(cmx2xx_it8152_irq_gpio) = GPIO_bit(cmx2xx_it8152_irq_gpio);
3696a8a4 MR	63
	64	it8152_irq_demux(irq, desc);
	65	}
	66
da591937	67	void __cmx2xx_pci_init_irq(int irq_gpio)
3696a8a4 MR	68	{
3696a8a4 MR	69	it8152_init_irq();
3696a8a4	70
da591937	71	cmx2xx_it8152_irq_gpio = irq_gpio;
2f01a973	72
6cab4860	73	set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);
2f01a973	74
da591937	75	set_irq_chained_handler(gpio_to_irq(irq_gpio), cmx2xx_it8152_irq_demux);
3696a8a4 MR	76	}
	77
	78	#ifdef CONFIG_PM
	79	static unsigned long sleep_save_ite[10];
	80
da591937	81	void __cmx2xx_pci_suspend(void)
3696a8a4 MR	82	{
	83	/* save ITE state */
	84	sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
	85	sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
	86	sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);
	87
	88	/* Clear ITE IRQ's */
	89	__raw_writel((0), IT8152_INTC_PDCNIRR);
	90	__raw_writel((0), IT8152_INTC_LPCNIRR);
	91	}
	92
da591937	93	void __cmx2xx_pci_resume(void)
3696a8a4 MR	94	{
	95	/* restore IT8152 state */
	96	__raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
	97	__raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
	98	__raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
	99	}
	100	#else
da591937 MR	101	void cmx2xx_pci_suspend(void) {}
da591937 MR	102	void cmx2xx_pci_resume(void) {}
3696a8a4 MR	103	#endif
	104
	105	/* PCI IRQ mapping*/
da591937	106	static int __init cmx2xx_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
3696a8a4 MR	107	{
	108	int irq;
	109
8e86f427	110	dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
3696a8a4 MR	111
	112	irq = it8152_pci_map_irq(dev, slot, pin);
	113	if (irq)
	114	return irq;
	115
	116	/*
	117	Here comes the ugly part. The routing is baseboard specific,
da591937 MR	118	but defining a platform for each possible base of CM-X2XX is
da591937 MR	119	unrealistic. Here we keep mapping for ATXBase and SB-X2XX.
3696a8a4 MR	120	*/
	121	/* ATXBASE PCI slot */
	122	if (slot == 7)
	123	return IT8152_PCI_INTA;
	124
da591937	125	/* ATXBase/SB-X2XX CardBus */
3696a8a4 MR	126	if (slot == 8 \|\| slot == 0)
	127	return IT8152_PCI_INTB;
	128
	129	/* ATXBase Ethernet */
	130	if (slot == 9)
	131	return IT8152_PCI_INTA;
	132
a7f3f030 MR	133	/* CM-x255 Onboard Ethernet */
	134	if (slot == 15)
	135	return IT8152_PCI_INTC;
	136
	137	/* SB-x2xx Ethernet */
3696a8a4 MR	138	if (slot == 16)
	139	return IT8152_PCI_INTA;
	140
	141	/* PC104+ interrupt routing */
	142	if ((slot == 17) \|\| (slot == 19))
	143	return IT8152_PCI_INTA;
	144	if ((slot == 18) \|\| (slot == 20))
	145	return IT8152_PCI_INTB;
	146
	147	return(0);
	148	}
	149
da591937	150	static void cmx2xx_pci_preinit(void)
3696a8a4	151	{
da591937	152	pr_info("Initializing CM-X2XX PCI subsystem\n");
3696a8a4 MR	153
	154	__raw_writel(0x800, IT8152_PCI_CFG_ADDR);
	155	if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
a0113a99	156	pr_info("PCI Bridge found.\n");
3696a8a4 MR	157
	158	/* set PCI I/O base at 0 */
	159	writel(0x848, IT8152_PCI_CFG_ADDR);
	160	writel(0, IT8152_PCI_CFG_DATA);
	161
	162	/* set PCI memory base at 0 */
	163	writel(0x840, IT8152_PCI_CFG_ADDR);
	164	writel(0, IT8152_PCI_CFG_DATA);
	165
	166	writel(0x20, IT8152_GPIO_GPDR);
	167
	168	/* CardBus Controller on ATXbase baseboard */
	169	writel(0x4000, IT8152_PCI_CFG_ADDR);
	170	if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
a0113a99	171	pr_info("CardBus Bridge found.\n");
3696a8a4 MR	172
	173	/* Configure socket 0 */
	174	writel(0x408C, IT8152_PCI_CFG_ADDR);
	175	writel(0x1022, IT8152_PCI_CFG_DATA);
	176
	177	writel(0x4080, IT8152_PCI_CFG_ADDR);
	178	writel(0x3844d060, IT8152_PCI_CFG_DATA);
	179
	180	writel(0x4090, IT8152_PCI_CFG_ADDR);
	181	writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) \|
	182	0x60440000),
	183	IT8152_PCI_CFG_DATA);
	184
	185	writel(0x4018, IT8152_PCI_CFG_ADDR);
	186	writel(0xb0000000, IT8152_PCI_CFG_DATA);
	187
	188	/* Configure socket 1 */
	189	writel(0x418C, IT8152_PCI_CFG_ADDR);
	190	writel(0x1022, IT8152_PCI_CFG_DATA);
	191
	192	writel(0x4180, IT8152_PCI_CFG_ADDR);
	193	writel(0x3844d060, IT8152_PCI_CFG_DATA);
	194
	195	writel(0x4190, IT8152_PCI_CFG_ADDR);
	196	writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) \|
	197	0x60440000),
	198	IT8152_PCI_CFG_DATA);
	199
	200	writel(0x4118, IT8152_PCI_CFG_ADDR);
	201	writel(0xb0000000, IT8152_PCI_CFG_DATA);
	202	}
	203	}
3696a8a4 MR	204	}
3696a8a4 MR	205
da591937	206	static struct hw_pci cmx2xx_pci __initdata = {
3696a8a4	207	.swizzle = pci_std_swizzle,
da591937	208	.map_irq = cmx2xx_pci_map_irq,
3696a8a4 MR	209	.nr_controllers = 1,
3696a8a4 MR	210	.setup = it8152_pci_setup,
a0113a99	211	.scan = it8152_pci_scan_bus,
da591937	212	.preinit = cmx2xx_pci_preinit,
3696a8a4 MR	213	};
3696a8a4 MR	214
da591937	215	static int __init cmx2xx_init_pci(void)
3696a8a4 MR	216	{
3696a8a4 MR	217	if (machine_is_armcore())
da591937	218	pci_common_init(&cmx2xx_pci);
3696a8a4 MR	219
	220	return 0;
	221	}
	222
da591937	223	subsys_initcall(cmx2xx_init_pci);