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Commit fa94f8dc authored by Jason Wang's avatar Jason Wang Committed by Sascha Hauer
Browse files

mxc: add common debug board for 3-stack platforms 



The debug board is little different for all mxc 3-stack(PDK)
platforms, it is possible here to add a common implementation to
support this board.

Signed-off-by: default avatarJason Wang <jason77.wang@gmail.com>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent 2dcf78c0

arch/arm/plat-mxc/3ds_debugboard.c

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/*

 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.

 * Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com>

 *

 * The code contained herein is licensed under the GNU General Public

 * License. You may obtain a copy of the GNU General Public License

 * Version 2 or later at the following locations:

 *

 * http://www.opensource.org/licenses/gpl-license.html

 * http://www.gnu.org/copyleft/gpl.html

 */



#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/io.h>

#include <linux/platform_device.h>

#include <linux/gpio.h>

#include <linux/smsc911x.h>



#include <mach/hardware.h>



/* LAN9217 ethernet base address */

#define LAN9217_BASE_ADDR(n)	(n + 0x0)

/* External UART */

#define UARTA_BASE_ADDR(n)	(n + 0x8000)

#define UARTB_BASE_ADDR(n)	(n + 0x10000)



#define BOARD_IO_ADDR(n)	(n + 0x20000)

/* LED switchs */

#define LED_SWITCH_REG		0x00

/* buttons */

#define SWITCH_BUTTONS_REG	0x08

/* status, interrupt */

#define INTR_STATUS_REG	0x10

#define INTR_MASK_REG		0x38

#define INTR_RESET_REG		0x20

/* magic word for debug CPLD */

#define MAGIC_NUMBER1_REG	0x40

#define MAGIC_NUMBER2_REG	0x48

/* CPLD code version */

#define CPLD_CODE_VER_REG	0x50

/* magic word for debug CPLD */

#define MAGIC_NUMBER3_REG	0x58

/* module reset register*/

#define MODULE_RESET_REG	0x60

/* CPU ID and Personality ID */

#define MCU_BOARD_ID_REG	0x68



#define MXC_IRQ_TO_EXPIO(irq)   ((irq) - MXC_BOARD_IRQ_START)

#define MXC_IRQ_TO_GPIO(irq)	((irq) - MXC_INTERNAL_IRQS)



#define MXC_EXP_IO_BASE		(MXC_BOARD_IRQ_START)

#define MXC_MAX_EXP_IO_LINES	16



/* interrupts like external uart , external ethernet etc*/

#define EXPIO_INT_ENET		(MXC_BOARD_IRQ_START + 0)

#define EXPIO_INT_XUART_A	(MXC_BOARD_IRQ_START + 1)

#define EXPIO_INT_XUART_B	(MXC_BOARD_IRQ_START + 2)

#define EXPIO_INT_BUTTON_A	(MXC_BOARD_IRQ_START + 3)

#define EXPIO_INT_BUTTON_B	(MXC_BOARD_IRQ_START + 4)



static void __iomem *brd_io;

static void expio_ack_irq(u32 irq);



static struct resource smsc911x_resources[] = {

	{

		.flags = IORESOURCE_MEM,

	} , {

		.start = EXPIO_INT_ENET,

		.end = EXPIO_INT_ENET,

		.flags = IORESOURCE_IRQ,

	},

};



static struct smsc911x_platform_config smsc911x_config = {

	.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,

	.flags = SMSC911X_USE_32BIT | SMSC911X_FORCE_INTERNAL_PHY,

};



static struct platform_device smsc_lan9217_device = {

	.name = "smsc911x",

	.id = 0,

	.dev = {

		.platform_data = &smsc911x_config,

	},

	.num_resources = ARRAY_SIZE(smsc911x_resources),

	.resource = smsc911x_resources,

};



static void mxc_expio_irq_handler(u32 irq, struct irq_desc *desc)

{

	u32 imr_val;

	u32 int_valid;

	u32 expio_irq;



	desc->chip->mask(irq);	/* irq = gpio irq number */



	imr_val = __raw_readw(brd_io + INTR_MASK_REG);

	int_valid = __raw_readw(brd_io + INTR_STATUS_REG) & ~imr_val;



	expio_irq = MXC_BOARD_IRQ_START;

	for (; int_valid != 0; int_valid >>= 1, expio_irq++) {

		struct irq_desc *d;

		if ((int_valid & 1) == 0)

			continue;

		d = irq_desc + expio_irq;

		if (unlikely(!(d->handle_irq)))

			pr_err("\nEXPIO irq: %d unhandled\n", expio_irq);

		else

			d->handle_irq(expio_irq, d);

	}



	desc->chip->ack(irq);

	desc->chip->unmask(irq);

}



/*

 * Disable an expio pin's interrupt by setting the bit in the imr.

 * Irq is an expio virtual irq number

 */

static void expio_mask_irq(u32 irq)

{

	u16 reg;

	u32 expio = MXC_IRQ_TO_EXPIO(irq);



	reg = __raw_readw(brd_io + INTR_MASK_REG);

	reg |= (1 << expio);

	__raw_writew(reg, brd_io + INTR_MASK_REG);

}



static void expio_ack_irq(u32 irq)

{

	u32 expio = MXC_IRQ_TO_EXPIO(irq);



	__raw_writew(1 << expio, brd_io + INTR_RESET_REG);

	__raw_writew(0, brd_io + INTR_RESET_REG);

	expio_mask_irq(irq);

}



static void expio_unmask_irq(u32 irq)

{

	u16 reg;

	u32 expio = MXC_IRQ_TO_EXPIO(irq);



	reg = __raw_readw(brd_io + INTR_MASK_REG);

	reg &= ~(1 << expio);

	__raw_writew(reg, brd_io + INTR_MASK_REG);

}



static struct irq_chip expio_irq_chip = {

	.ack = expio_ack_irq,

	.mask = expio_mask_irq,

	.unmask = expio_unmask_irq,

};



int __init mxc_expio_init(u32 base, u32 p_irq)

{

	int i;



	brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K);

	if (brd_io == NULL)

		return -ENOMEM;



	if ((__raw_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) ||

	    (__raw_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) ||

	    (__raw_readw(brd_io + MAGIC_NUMBER3_REG) != 0xCAFE)) {

		pr_info("3-Stack Debug board not detected\n");

		iounmap(brd_io);

		brd_io = NULL;

		return -ENODEV;

	}



	pr_info("3-Stack Debug board detected, rev = 0x%04X\n",

		readw(brd_io + CPLD_CODE_VER_REG));



	/*

	 * Configure INT line as GPIO input

	 */

	gpio_request(MXC_IRQ_TO_GPIO(p_irq), "expio_pirq");

	gpio_direction_input(MXC_IRQ_TO_GPIO(p_irq));



	/* disable the interrupt and clear the status */

	__raw_writew(0, brd_io + INTR_MASK_REG);

	__raw_writew(0xFFFF, brd_io + INTR_RESET_REG);

	__raw_writew(0, brd_io + INTR_RESET_REG);

	__raw_writew(0x1F, brd_io + INTR_MASK_REG);

	for (i = MXC_EXP_IO_BASE;

	     i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES); i++) {

		set_irq_chip(i, &expio_irq_chip);

		set_irq_handler(i, handle_level_irq);

		set_irq_flags(i, IRQF_VALID);

	}

	set_irq_type(p_irq, IRQF_TRIGGER_LOW);

	set_irq_chained_handler(p_irq, mxc_expio_irq_handler);



	/* Register Lan device on the debugboard */

	smsc911x_resources[0].start = LAN9217_BASE_ADDR(base);

	smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1;

	platform_device_register(&smsc_lan9217_device);



	return 0;

}

arch/arm/plat-mxc/Kconfig

+11 −0
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@@ -80,6 +80,17 @@ config MXC_PWM 
	help

	  Enable support for the i.MX PWM controller(s).



config MXC_DEBUG_BOARD

	bool "Enable MXC debug board(for 3-stack)"

	help

	  The debug board is an integral part of the MXC 3-stack(PDK)

	  platforms, it can be attached or removed from the peripheral

	  board. On debug board, several debug devices(ethernet, UART,

	  buttons, LEDs and JTAG) are implemented. Between the MCU and

	  these devices, a CPLD is added as a bridge which performs

	  data/address de-multiplexing and decode, signal level shift,

	  interrupt control and various board functions.



config MXC_ULPI

	bool

arch/arm/plat-mxc/Makefile

+1 −0
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@@ -15,6 +15,7 @@ obj-$(CONFIG_USB_EHCI_MXC) += ehci.o 
obj-$(CONFIG_MXC_ULPI) += ulpi.o

obj-$(CONFIG_ARCH_MXC_AUDMUX_V1) += audmux-v1.o

obj-$(CONFIG_ARCH_MXC_AUDMUX_V2) += audmux-v2.o

obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o

ifdef CONFIG_SND_IMX_SOC

obj-y += ssi-fiq.o

obj-y += ssi-fiq-ksym.o

arch/arm/plat-mxc/include/mach/3ds_debugboard.h

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/*

 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.

 *

 *

 * The code contained herein is licensed under the GNU General Public

 * License. You may obtain a copy of the GNU General Public License

 * Version 2 or later at the following locations:

 *

 * http://www.opensource.org/licenses/gpl-license.html

 * http://www.gnu.org/copyleft/gpl.html

 */



#ifndef __ASM_ARCH_MXC_3DS_DB_H__

#define __ASM_ARCH_MXC_3DS_DB_H__



extern int __init mxc_expio_init(u32 base, u32 p_irq);



#endif /* __ASM_ARCH_MXC_3DS_DB_H__ */