pcm990-baseboard.c

/*
 *  arch/arm/mach-pxa/pcm990-baseboard.c
 *  Support for the Phytec phyCORE-PXA270 Development Platform (PCM-990).
 *
 *  Refer
 *   http://www.phytec.com/products/rdk/ARM-XScale/phyCORE-XScale-PXA270.html
 *  for additional hardware info
 *
 *  Author:	Juergen Kilb
 *  Created:	April 05, 2005
 *  Copyright:	Phytec Messtechnik GmbH
 *  e-Mail:	armlinux@phytec.de
 *
 *  based on Intel Mainstone Board
 *
 *  Copyright 2007 Juergen Beisert @ Pengutronix (j.beisert@pengutronix.de)
 *
 *  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/irq.h>
#include <linux/platform_device.h>
#include <linux/ide.h>
#include <asm/mach/map.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/pxa2xx-gpio.h>
#include <asm/arch/mmc.h>
#include <asm/arch/ohci.h>
#include <asm/arch/pcm990_baseboard.h>

/*
 * The PCM-990 development baseboard uses PCM-027's hardeware in the
 * following way:
 *
 * - LCD support is in use
 *  - GPIO16 is output for back light on/off with PWM
 *  - GPIO58 ... GPIO73 are outputs for display data
 *  - GPIO74 is output output for LCDFCLK
 *  - GPIO75 is output for LCDLCLK
 *  - GPIO76 is output for LCDPCLK
 *  - GPIO77 is output for LCDBIAS
 * - MMC support is in use
 *  - GPIO32 is output for MMCCLK
 *  - GPIO92 is MMDAT0
 *  - GPIO109 is MMDAT1
 *  - GPIO110 is MMCS0
 *  - GPIO111 is MMCS1
 *  - GPIO112 is MMCMD
 * - IDE/CF card is in use
 *  - GPIO48 is output /POE
 *  - GPIO49 is output /PWE
 *  - GPIO50 is output /PIOR
 *  - GPIO51 is output /PIOW
 *  - GPIO54 is output /PCE2
 *  - GPIO55 is output /PREG
 *  - GPIO56 is input /PWAIT
 *  - GPIO57 is output /PIOS16
 *  - GPIO79 is output PSKTSEL
 *  - GPIO85 is output /PCE1
 * - FFUART is in use
 *  - GPIO34 is input FFRXD
 *  - GPIO35 is input FFCTS
 *  - GPIO36 is input FFDCD
 *  - GPIO37 is input FFDSR
 *  - GPIO38 is input FFRI
 *  - GPIO39 is output FFTXD
 *  - GPIO40 is output FFDTR
 *  - GPIO41 is output FFRTS
 * - BTUART is in use
 *  - GPIO42 is input BTRXD
 *  - GPIO43 is output BTTXD
 *  - GPIO44 is input BTCTS
 *  - GPIO45 is output BTRTS
 * - IRUART is in use
 *  - GPIO46 is input STDRXD
 *  - GPIO47 is output STDTXD
 * - AC97 is in use*)
 *  - GPIO28 is input AC97CLK
 *  - GPIO29 is input AC97DatIn
 *  - GPIO30 is output AC97DatO
 *  - GPIO31 is output AC97SYNC
 *  - GPIO113 is output AC97_RESET
 * - SSP is in use
 *  - GPIO23 is output SSPSCLK
 *  - GPIO24 is output chip select to Max7301
 *  - GPIO25 is output SSPTXD
 *  - GPIO26 is input SSPRXD
 *  - GPIO27 is input for Max7301 IRQ
 *  - GPIO53 is input SSPSYSCLK
 * - SSP3 is in use
 *  - GPIO81 is output SSPTXD3
 *  - GPIO82 is input SSPRXD3
 *  - GPIO83 is output SSPSFRM
 *  - GPIO84 is output SSPCLK3
 *
 * Otherwise claimed GPIOs:
 * GPIO1 -> IRQ from user switch
 * GPIO9 -> IRQ from power management
 * GPIO10 -> IRQ from WML9712 AC97 controller
 * GPIO11 -> IRQ from IDE controller
 * GPIO12 -> IRQ from CF controller
 * GPIO13 -> IRQ from CF controller
 * GPIO14 -> GPIO free
 * GPIO15 -> /CS1 selects baseboard's Control CPLD (U7, 16 bit wide data path)
 * GPIO19 -> GPIO free
 * GPIO20 -> /SDCS2
 * GPIO21 -> /CS3 PC card socket select
 * GPIO33 -> /CS5  network controller select
 * GPIO78 -> /CS2  (16 bit wide data path)
 * GPIO80 -> /CS4  (16 bit wide data path)
 * GPIO86 -> GPIO free
 * GPIO87 -> GPIO free
 * GPIO90 -> LED0 on CPU module
 * GPIO91 -> LED1 on CPI module
 * GPIO117 -> SCL
 * GPIO118 -> SDA
 */

static unsigned long pcm990_irq_enabled;

static void pcm990_mask_ack_irq(unsigned int irq)
{
	int pcm990_irq = (irq - PCM027_IRQ(0));
	PCM990_INTMSKENA = (pcm990_irq_enabled &= ~(1 << pcm990_irq));
}

static void pcm990_unmask_irq(unsigned int irq)
{
	int pcm990_irq = (irq - PCM027_IRQ(0));
	/* the irq can be acknowledged only if deasserted, so it's done here */
	PCM990_INTSETCLR |= 1 << pcm990_irq;
	PCM990_INTMSKENA  = (pcm990_irq_enabled |= (1 << pcm990_irq));
}

static struct irq_chip pcm990_irq_chip = {
	.mask_ack	= pcm990_mask_ack_irq,
	.unmask		= pcm990_unmask_irq,
};

static void pcm990_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	unsigned long pending = (~PCM990_INTSETCLR) & pcm990_irq_enabled;

	do {
		GEDR(PCM990_CTRL_INT_IRQ_GPIO) =
					GPIO_bit(PCM990_CTRL_INT_IRQ_GPIO);
		if (likely(pending)) {
			irq = PCM027_IRQ(0) + __ffs(pending);
			desc = irq_desc + irq;
			desc_handle_irq(irq, desc);
		}
		pending = (~PCM990_INTSETCLR) & pcm990_irq_enabled;
	} while (pending);
}

static void __init pcm990_init_irq(void)
{
	int irq;

	/* setup extra PCM990 irqs */
	for (irq = PCM027_IRQ(0); irq <= PCM027_IRQ(3); irq++) {
		set_irq_chip(irq, &pcm990_irq_chip);
		set_irq_handler(irq, handle_level_irq);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}

	PCM990_INTMSKENA = 0x00;	/* disable all Interrupts */
	PCM990_INTSETCLR = 0xFF;

	set_irq_chained_handler(PCM990_CTRL_INT_IRQ, pcm990_irq_handler);
	set_irq_type(PCM990_CTRL_INT_IRQ, PCM990_CTRL_INT_IRQ_EDGE);
}

static int pcm990_mci_init(struct device *dev, irq_handler_t mci_detect_int,
			void *data)
{
	int err;

	/*
	 * enable GPIO for PXA27x MMC controller
	 */
	pxa_gpio_mode(GPIO32_MMCCLK_MD);
	pxa_gpio_mode(GPIO112_MMCCMD_MD);
	pxa_gpio_mode(GPIO92_MMCDAT0_MD);
	pxa_gpio_mode(GPIO109_MMCDAT1_MD);
	pxa_gpio_mode(GPIO110_MMCDAT2_MD);
	pxa_gpio_mode(GPIO111_MMCDAT3_MD);

	err = request_irq(PCM027_MMCDET_IRQ, mci_detect_int, IRQF_DISABLED,
			     "MMC card detect", data);
	if (err)
		printk(KERN_ERR "pcm990_mci_init: MMC/SD: can't request MMC "
				"card detect IRQ\n");

	return err;
}

static void pcm990_mci_setpower(struct device *dev, unsigned int vdd)
{
	struct pxamci_platform_data *p_d = dev->platform_data;

	if ((1 << vdd) & p_d->ocr_mask)
		__PCM990_CTRL_REG(PCM990_CTRL_PHYS + PCM990_CTRL_REG5) =
						PCM990_CTRL_MMC2PWR;
	else
		__PCM990_CTRL_REG(PCM990_CTRL_PHYS + PCM990_CTRL_REG5) =
						~PCM990_CTRL_MMC2PWR;
}

static void pcm990_mci_exit(struct device *dev, void *data)
{
	free_irq(PCM027_MMCDET_IRQ, data);
}

#define MSECS_PER_JIFFY (1000/HZ)

static struct pxamci_platform_data pcm990_mci_platform_data = {
	.detect_delay	= 250 / MSECS_PER_JIFFY,
	.ocr_mask	= MMC_VDD_32_33 | MMC_VDD_33_34,
	.init 		= pcm990_mci_init,
	.setpower 	= pcm990_mci_setpower,
	.exit		= pcm990_mci_exit,
};

/*
 * init OHCI hardware to work with
 *
 * Note: Only USB port 1 (host only) is connected
 *
 * GPIO88 (USBHPWR#1): overcurrent in, overcurrent when low
 * GPIO89 (USBHPEN#1): power-on out, on when low
 */
static int pcm990_ohci_init(struct device *dev)
{
	pxa_gpio_mode(PCM990_USB_OVERCURRENT);
	pxa_gpio_mode(PCM990_USB_PWR_EN);
	/*
	 * disable USB port 2 and 3
	 * power sense is active low
	 */
	UHCHR = ((UHCHR) | UHCHR_PCPL | UHCHR_PSPL | UHCHR_SSEP2 |
				UHCHR_SSEP3) & ~(UHCHR_SSEP1 | UHCHR_SSE);
	/*
	 * wait 10ms after Power on
	 * overcurrent per port
	 * power switch per port
	 */
	UHCRHDA = (5<<24) | (1<<11) | (1<<8);	/* FIXME: Required? */

	return 0;
}

static struct pxaohci_platform_data pcm990_ohci_platform_data = {
	.port_mode	= PMM_PERPORT_MODE,
	.init		= pcm990_ohci_init,
	.exit		= NULL,
};

/*
 * AC97 support
 * Note: The connected AC97 mixer also reports interrupts at PCM990_AC97_IRQ
 */
static struct resource pxa27x_ac97_resources[] = {
	[0] = {
		.start  = 0x40500000,
		.end	= 0x40500000 + 0xfff,
		.flags  = IORESOURCE_MEM,
	},
	[1] = {
		.start  = IRQ_AC97,
		.end    = IRQ_AC97,
		.flags  = IORESOURCE_IRQ,
	},
};

static u64 pxa_ac97_dmamask = 0xffffffffUL;

static struct platform_device pxa27x_device_ac97 = {
	.name           = "pxa2xx-ac97",
	.id             = -1,
	.dev            = {
		.dma_mask = &pxa_ac97_dmamask,
		.coherent_dma_mask = 0xffffffff,
	},
	.num_resources  = ARRAY_SIZE(pxa27x_ac97_resources),
	.resource       = pxa27x_ac97_resources,
};

/*
 * enable generic access to the base board control CPLDs U6 and U7
 */
static struct map_desc pcm990_io_desc[] __initdata = {
	{
		.virtual	= PCM990_CTRL_BASE,
		.pfn		= __phys_to_pfn(PCM990_CTRL_PHYS),
		.length		= PCM990_CTRL_SIZE,
		.type		= MT_DEVICE	/* CPLD */
	}, {
		.virtual	= PCM990_CF_PLD_BASE,
		.pfn		= __phys_to_pfn(PCM990_CF_PLD_PHYS),
		.length		= PCM990_CF_PLD_SIZE,
		.type		= MT_DEVICE	/* CPLD */
	}
};

/*
 * system init for baseboard usage. Will be called by pcm027 init.
 *
 * Add platform devices present on this baseboard and init
 * them from CPU side as far as required to use them later on
 */
void __init pcm990_baseboard_init(void)
{
	/* register CPLD access */
	iotable_init(pcm990_io_desc, ARRAY_SIZE(pcm990_io_desc));

	/* register CPLD's IRQ controller */
	pcm990_init_irq();

	platform_device_register(&pxa27x_device_ac97);

	/* MMC */
	pxa_set_mci_info(&pcm990_mci_platform_data);

	/* USB host */
	pxa_set_ohci_info(&pcm990_ohci_platform_data);

	printk(KERN_INFO"PCM-990 Evaluation baseboard initialized\n");
}