[mirror_ubuntu-focal-kernel.git] / arch / arm / mach-ixp2000 / ixdp2x00.c

/*
 * arch/arm/mach-ixp2000/ixdp2x00.c
 *
 * Code common to IXDP2400 and IXDP2800 platforms.
 *
 * Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright (C) 2002 Intel Corp.
 * Copyright (C) 2003-2004 MontaVista Software, Inc.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>

#include <asm/mach/pci.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/mach/flash.h>
#include <asm/mach/arch.h>

#include <mach/gpio.h>


/*************************************************************************
 * IXDP2x00 IRQ Initialization
 *************************************************************************/
static volatile unsigned long *board_irq_mask;
static volatile unsigned long *board_irq_stat;
static unsigned long board_irq_count;

#ifdef CONFIG_ARCH_IXDP2400
/*
 * Slowport configuration for accessing CPLD registers on IXDP2x00
 */
static struct slowport_cfg slowport_cpld_cfg = {
	.CCR =	SLOWPORT_CCR_DIV_2,
	.WTC = 0x00000070,
	.RTC = 0x00000070,
	.PCR = SLOWPORT_MODE_FLASH,
	.ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8
};
#endif

static void ixdp2x00_irq_mask(unsigned int irq)
{
	unsigned long dummy;
	static struct slowport_cfg old_cfg;

	/*
	 * This is ugly in common code but really don't know
	 * of a better way to handle it. :(
	 */
#ifdef CONFIG_ARCH_IXDP2400
	if (machine_is_ixdp2400())
		ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
#endif

	dummy = *board_irq_mask;
	dummy |=  IXP2000_BOARD_IRQ_MASK(irq);
	ixp2000_reg_wrb(board_irq_mask, dummy);

#ifdef CONFIG_ARCH_IXDP2400
	if (machine_is_ixdp2400())
		ixp2000_release_slowport(&old_cfg);
#endif
}

static void ixdp2x00_irq_unmask(unsigned int irq)
{
	unsigned long dummy;
	static struct slowport_cfg old_cfg;

#ifdef CONFIG_ARCH_IXDP2400
	if (machine_is_ixdp2400())
		ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
#endif

	dummy = *board_irq_mask;
	dummy &=  ~IXP2000_BOARD_IRQ_MASK(irq);
	ixp2000_reg_wrb(board_irq_mask, dummy);

	if (machine_is_ixdp2400()) 
		ixp2000_release_slowport(&old_cfg);
}

static void ixdp2x00_irq_handler(unsigned int irq, struct irq_desc *desc)
{
        volatile u32 ex_interrupt = 0;
	static struct slowport_cfg old_cfg;
	int i;

	desc->chip->mask(irq);

#ifdef CONFIG_ARCH_IXDP2400
	if (machine_is_ixdp2400())
		ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
#endif
        ex_interrupt = *board_irq_stat & 0xff;
	if (machine_is_ixdp2400())
		ixp2000_release_slowport(&old_cfg);

	if(!ex_interrupt) {
		printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n");
		return;
	}

	for(i = 0; i < board_irq_count; i++) {
		if(ex_interrupt & (1 << i))  {
			int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
			generic_handle_irq(cpld_irq);
		}
	}

	desc->chip->unmask(irq);
}

static struct irq_chip ixdp2x00_cpld_irq_chip = {
	.ack	= ixdp2x00_irq_mask,
	.mask	= ixdp2x00_irq_mask,
	.unmask	= ixdp2x00_irq_unmask
};

void __init ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_irqs)
{
	unsigned int irq;

	ixp2000_init_irq();
	
	if (!ixdp2x00_master_npu())
		return;

	board_irq_stat = stat_reg;
	board_irq_mask = mask_reg;
	board_irq_count = nr_irqs;

	*board_irq_mask = 0xffffffff;

	for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
		set_irq_chip(irq, &ixdp2x00_cpld_irq_chip);
		set_irq_handler(irq, handle_level_irq);
		set_irq_flags(irq, IRQF_VALID);
	}

	/* Hook into PCI interrupt */
	set_irq_chained_handler(IRQ_IXP2000_PCIB, ixdp2x00_irq_handler);
}

/*************************************************************************
 * IXDP2x00 memory map
 *************************************************************************/
static struct map_desc ixdp2x00_io_desc __initdata = {
	.virtual	= IXDP2X00_VIRT_CPLD_BASE, 
	.pfn		= __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE),
	.length		= IXDP2X00_CPLD_SIZE,
	.type		= MT_DEVICE
};

void __init ixdp2x00_map_io(void)
{
	ixp2000_map_io();	

	iotable_init(&ixdp2x00_io_desc, 1);
}

/*************************************************************************
 * IXDP2x00-common PCI init
 *
 * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board 
 * contains two NPUs (ingress and egress) connected over PCI,  both running 
 * instances  of the kernel. So far so good. Peers on the PCI bus running 
 * Linux is a common design in telecom systems. The problem is that instead 
 * of all the devices being controlled by a single host, different
 * devices are controlled by different NPUs on the same bus, leading to
 * multiple hosts on the bus. The exact bus layout looks like:
 *
 *                   Bus 0
 *    Master NPU <-------------------+-------------------> Slave NPU
 *                                   |
 *                                   |
 *                                  P2P 
 *                                   |
 *
 *                  Bus 1            |
 *               <--+------+---------+---------+------+-->
 *                  |      |         |         |      |
 *                  |      |         |         |      |
 *             ... Dev    PMC       Media     Eth0   Eth1 ...
 *
 * The master controls all but Eth1, which is controlled by the
 * slave. What this means is that the both the master and the slave
 * have to scan the bus, but only one of them can enumerate the bus.
 * In addition, after the bus is scanned, each kernel must remove
 * the device(s) it does not control from the PCI dev list otherwise
 * a driver on each NPU will try to manage it and we will have horrible
 * conflicts. Oh..and the slave NPU needs to see the master NPU
 * for Intel's drivers to work properly. Closed source drivers...
 *
 * The way we deal with this is fairly simple but ugly:
 *
 * 1) Let master scan and enumerate the bus completely.
 * 2) Master deletes Eth1 from device list.
 * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave)
 *    from device list.
 * 4) Find HW designers and LART them.
 *
 * The boards also do not do normal PCI IRQ routing, or any sort of 
 * sensical  swizzling, so we just need to check where on the  bus a
 * device sits and figure out to which CPLD pin the interrupt is routed.
 * See ixdp2[48]00.c files.
 *
 *************************************************************************/
void ixdp2x00_slave_pci_postinit(void)
{
	struct pci_dev *dev;

	/*
	 * Remove PMC device is there is one
	 */
	if((dev = pci_get_bus_and_slot(1, IXDP2X00_PMC_DEVFN))) {
		pci_remove_bus_device(dev);
		pci_dev_put(dev);
	}

	dev = pci_get_bus_and_slot(0, IXDP2X00_21555_DEVFN);
	pci_remove_bus_device(dev);
	pci_dev_put(dev);
}

/**************************************************************************
 * IXDP2x00 Machine Setup
 *************************************************************************/
static struct flash_platform_data ixdp2x00_platform_data = {
	.map_name	= "cfi_probe",
	.width		= 1,
};

static struct ixp2000_flash_data ixdp2x00_flash_data = {
	.platform_data	= &ixdp2x00_platform_data,
	.nr_banks	= 1
};

static struct resource ixdp2x00_flash_resource = {
	.start		= 0xc4000000,
	.end		= 0xc4000000 + 0x00ffffff,
	.flags		= IORESOURCE_MEM,
};

static struct platform_device ixdp2x00_flash = {
	.name		= "IXP2000-Flash",
	.id		= 0,
	.dev		= {
		.platform_data = &ixdp2x00_flash_data,
	},
	.num_resources	= 1,
	.resource	= &ixdp2x00_flash_resource,
};

static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = {
	.sda_pin	= IXDP2X00_GPIO_SDA,
	.scl_pin	= IXDP2X00_GPIO_SCL,
};

static struct platform_device ixdp2x00_i2c_controller = {
	.name		= "IXP2000-I2C",
	.id		= 0,
	.dev		= {
		.platform_data = &ixdp2x00_i2c_gpio_pins,
	},
	.num_resources	= 0
};

static struct platform_device *ixdp2x00_devices[] __initdata = {
	&ixdp2x00_flash,
	&ixdp2x00_i2c_controller
};

void __init ixdp2x00_init_machine(void)
{
	gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1);
	gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT);

	platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices));
	ixp2000_uart_init();
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/arm/mach-ixp2000/ixdp2x00.c
	3	*
	4	* Code common to IXDP2400 and IXDP2800 platforms.
	5	*
	6	* Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
	7	* Maintainer: Deepak Saxena <dsaxena@plexity.net>
	8	*
	9	* Copyright (C) 2002 Intel Corp.
	10	* Copyright (C) 2003-2004 MontaVista Software, Inc.
	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License as published by the
	14	* Free Software Foundation; either version 2 of the License, or (at your
	15	* option) any later version.
	16	*/
1da177e4 LT	17	#include <linux/kernel.h>
	18	#include <linux/init.h>
	19	#include <linux/mm.h>
	20	#include <linux/sched.h>
	21	#include <linux/interrupt.h>
d052d1be	22	#include <linux/platform_device.h>
1da177e4 LT	23	#include <linux/bitops.h>
	24	#include <linux/pci.h>
	25	#include <linux/ioport.h>
	26	#include <linux/slab.h>
	27	#include <linux/delay.h>
fced80c7	28	#include <linux/io.h>
1da177e4	29
1da177e4 LT	30	#include <asm/irq.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/page.h>
	33	#include <asm/system.h>
a09e64fb	34	#include <mach/hardware.h>
1da177e4 LT	35	#include <asm/mach-types.h>
	36
	37	#include <asm/mach/pci.h>
	38	#include <asm/mach/map.h>
	39	#include <asm/mach/irq.h>
	40	#include <asm/mach/time.h>
	41	#include <asm/mach/flash.h>
	42	#include <asm/mach/arch.h>
	43
a09e64fb	44	#include <mach/gpio.h>
8144f56b LB	45
8144f56b LB	46
1da177e4 LT	47	/*************************************************************************
	48	* IXDP2x00 IRQ Initialization
	49	*************************************************************************/
	50	static volatile unsigned long *board_irq_mask;
	51	static volatile unsigned long *board_irq_stat;
	52	static unsigned long board_irq_count;
	53
	54	#ifdef CONFIG_ARCH_IXDP2400
	55	/*
	56	* Slowport configuration for accessing CPLD registers on IXDP2x00
	57	*/
	58	static struct slowport_cfg slowport_cpld_cfg = {
	59	.CCR = SLOWPORT_CCR_DIV_2,
	60	.WTC = 0x00000070,
	61	.RTC = 0x00000070,
	62	.PCR = SLOWPORT_MODE_FLASH,
	63	.ADC = SLOWPORT_ADDR_WIDTH_24 \| SLOWPORT_DATA_WIDTH_8
	64	};
	65	#endif
	66
	67	static void ixdp2x00_irq_mask(unsigned int irq)
	68	{
	69	unsigned long dummy;
	70	static struct slowport_cfg old_cfg;
	71
	72	/*
	73	* This is ugly in common code but really don't know
	74	* of a better way to handle it. :(
	75	*/
	76	#ifdef CONFIG_ARCH_IXDP2400
	77	if (machine_is_ixdp2400())
	78	ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
	79	#endif
	80
	81	dummy = *board_irq_mask;
	82	dummy \|= IXP2000_BOARD_IRQ_MASK(irq);
e9b72e43	83	ixp2000_reg_wrb(board_irq_mask, dummy);
1da177e4 LT	84
	85	#ifdef CONFIG_ARCH_IXDP2400
	86	if (machine_is_ixdp2400())
	87	ixp2000_release_slowport(&old_cfg);
	88	#endif
	89	}
	90
	91	static void ixdp2x00_irq_unmask(unsigned int irq)
	92	{
	93	unsigned long dummy;
	94	static struct slowport_cfg old_cfg;
	95
	96	#ifdef CONFIG_ARCH_IXDP2400
	97	if (machine_is_ixdp2400())
	98	ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
	99	#endif
	100
	101	dummy = *board_irq_mask;
	102	dummy &= ~IXP2000_BOARD_IRQ_MASK(irq);
e9b72e43	103	ixp2000_reg_wrb(board_irq_mask, dummy);
1da177e4 LT	104
	105	if (machine_is_ixdp2400())
	106	ixp2000_release_slowport(&old_cfg);
	107	}
	108
10dd5ce2	109	static void ixdp2x00_irq_handler(unsigned int irq, struct irq_desc *desc)
1da177e4 LT	110	{
	111	volatile u32 ex_interrupt = 0;
	112	static struct slowport_cfg old_cfg;
	113	int i;
	114
	115	desc->chip->mask(irq);
	116
	117	#ifdef CONFIG_ARCH_IXDP2400
	118	if (machine_is_ixdp2400())
	119	ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
	120	#endif
	121	ex_interrupt = *board_irq_stat & 0xff;
	122	if (machine_is_ixdp2400())
	123	ixp2000_release_slowport(&old_cfg);
	124
	125	if(!ex_interrupt) {
	126	printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n");
	127	return;
	128	}
	129
	130	for(i = 0; i < board_irq_count; i++) {
	131	if(ex_interrupt & (1 << i)) {
1da177e4	132	int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
d8aa0251	133	generic_handle_irq(cpld_irq);
1da177e4 LT	134	}
	135	}
	136
	137	desc->chip->unmask(irq);
	138	}
	139
10dd5ce2	140	static struct irq_chip ixdp2x00_cpld_irq_chip = {
1da177e4 LT	141	.ack = ixdp2x00_irq_mask,
	142	.mask = ixdp2x00_irq_mask,
	143	.unmask = ixdp2x00_irq_unmask
	144	};
	145
cdea4606	146	void __init ixdp2x00_init_irq(volatile unsigned long stat_reg, volatile unsigned long mask_reg, unsigned long nr_irqs)
1da177e4 LT	147	{
	148	unsigned int irq;
	149
	150	ixp2000_init_irq();
	151
	152	if (!ixdp2x00_master_npu())
	153	return;
	154
	155	board_irq_stat = stat_reg;
	156	board_irq_mask = mask_reg;
	157	board_irq_count = nr_irqs;
	158
	159	*board_irq_mask = 0xffffffff;
	160
	161	for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
	162	set_irq_chip(irq, &ixdp2x00_cpld_irq_chip);
10dd5ce2	163	set_irq_handler(irq, handle_level_irq);
1da177e4 LT	164	set_irq_flags(irq, IRQF_VALID);
	165	}
	166
	167	/* Hook into PCI interrupt */
64ffae8a	168	set_irq_chained_handler(IRQ_IXP2000_PCIB, ixdp2x00_irq_handler);
1da177e4 LT	169	}
	170
	171	/*************************************************************************
	172	* IXDP2x00 memory map
	173	*************************************************************************/
	174	static struct map_desc ixdp2x00_io_desc __initdata = {
	175	.virtual = IXDP2X00_VIRT_CPLD_BASE,
db0d087e	176	.pfn = __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE),
1da177e4 LT	177	.length = IXDP2X00_CPLD_SIZE,
	178	.type = MT_DEVICE
	179	};
	180
	181	void __init ixdp2x00_map_io(void)
	182	{
	183	ixp2000_map_io();
	184
	185	iotable_init(&ixdp2x00_io_desc, 1);
	186	}
	187
	188	/*************************************************************************
	189	* IXDP2x00-common PCI init
	190	*
	191	* The IXDP2[48]00 has a horrid PCI bus layout. Basically the board
	192	* contains two NPUs (ingress and egress) connected over PCI, both running
	193	* instances of the kernel. So far so good. Peers on the PCI bus running
	194	* Linux is a common design in telecom systems. The problem is that instead
	195	* of all the devices being controlled by a single host, different
6cbdc8c5	196	* devices are controlled by different NPUs on the same bus, leading to
1da177e4 LT	197	* multiple hosts on the bus. The exact bus layout looks like:
	198	*
	199	* Bus 0
	200	* Master NPU <-------------------+-------------------> Slave NPU
	201	* \|
	202	* \|
	203	* P2P
	204	* \|
	205	*
	206	* Bus 1 \|
	207	* <--+------+---------+---------+------+-->
	208	* \| \| \| \| \|
	209	* \| \| \| \| \|
	210	* ... Dev PMC Media Eth0 Eth1 ...
	211	*
6cbdc8c5	212	* The master controls all but Eth1, which is controlled by the
1da177e4 LT	213	* slave. What this means is that the both the master and the slave
	214	* have to scan the bus, but only one of them can enumerate the bus.
	215	* In addition, after the bus is scanned, each kernel must remove
	216	* the device(s) it does not control from the PCI dev list otherwise
	217	* a driver on each NPU will try to manage it and we will have horrible
	218	* conflicts. Oh..and the slave NPU needs to see the master NPU
	219	* for Intel's drivers to work properly. Closed source drivers...
	220	*
	221	* The way we deal with this is fairly simple but ugly:
	222	*
	223	* 1) Let master scan and enumerate the bus completely.
	224	* 2) Master deletes Eth1 from device list.
	225	* 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave)
	226	* from device list.
	227	* 4) Find HW designers and LART them.
	228	*
	229	* The boards also do not do normal PCI IRQ routing, or any sort of
	230	* sensical swizzling, so we just need to check where on the bus a
	231	* device sits and figure out to which CPLD pin the interrupt is routed.
	232	* See ixdp2[48]00.c files.
	233	*
	234	*************************************************************************/
	235	void ixdp2x00_slave_pci_postinit(void)
	236	{
	237	struct pci_dev *dev;
	238
	239	/*
	240	* Remove PMC device is there is one
	241	*/
7281c248	242	if((dev = pci_get_bus_and_slot(1, IXDP2X00_PMC_DEVFN))) {
1da177e4	243	pci_remove_bus_device(dev);
7281c248 AC	244	pci_dev_put(dev);
7281c248 AC	245	}
1da177e4	246
7281c248	247	dev = pci_get_bus_and_slot(0, IXDP2X00_21555_DEVFN);
1da177e4	248	pci_remove_bus_device(dev);
7281c248	249	pci_dev_put(dev);
1da177e4 LT	250	}
	251
	252	/**************************************************************************
	253	* IXDP2x00 Machine Setup
	254	*************************************************************************/
	255	static struct flash_platform_data ixdp2x00_platform_data = {
	256	.map_name = "cfi_probe",
	257	.width = 1,
	258	};
	259
	260	static struct ixp2000_flash_data ixdp2x00_flash_data = {
	261	.platform_data = &ixdp2x00_platform_data,
	262	.nr_banks = 1
	263	};
	264
	265	static struct resource ixdp2x00_flash_resource = {
	266	.start = 0xc4000000,
	267	.end = 0xc4000000 + 0x00ffffff,
	268	.flags = IORESOURCE_MEM,
	269	};
	270
	271	static struct platform_device ixdp2x00_flash = {
	272	.name = "IXP2000-Flash",
	273	.id = 0,
	274	.dev = {
	275	.platform_data = &ixdp2x00_flash_data,
	276	},
	277	.num_resources = 1,
	278	.resource = &ixdp2x00_flash_resource,
	279	};
	280
	281	static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = {
	282	.sda_pin = IXDP2X00_GPIO_SDA,
	283	.scl_pin = IXDP2X00_GPIO_SCL,
	284	};
	285
	286	static struct platform_device ixdp2x00_i2c_controller = {
	287	.name = "IXP2000-I2C",
	288	.id = 0,
	289	.dev = {
	290	.platform_data = &ixdp2x00_i2c_gpio_pins,
	291	},
	292	.num_resources = 0
	293	};
	294
	295	static struct platform_device *ixdp2x00_devices[] __initdata = {
	296	&ixdp2x00_flash,
	297	&ixdp2x00_i2c_controller
	298	};
	299
	300	void __init ixdp2x00_init_machine(void)
	301	{
	302	gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1);
	303	gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT);
	304
	305	platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices));
28187f2c	306	ixp2000_uart_init();
1da177e4 LT	307	}
1da177e4 LT	308