[ARM] 4747/1: pcm027: support for pcm990 baseboard for phyCORE-PXA270

This patch adds baseboard support for the phyCORE-PXA270 development
kit (aka PCM-990).

This example shows how to use some phyCORE-PXA270 CPU module features
on a baseboard in a standard manner. It could be used as a starting
point for custom baseboard development.

V2:
 After comments by Eric Miao:
  - IRQ chained handler fixed
  - video/graphic support moved to separate patch
  - ifdef/endif hell reduced ;-)

V3:
 After comments by Russell King
  - initialise the mmci platform data statically

V4:
 After comments by Russell King
  - wrong return value in pcm990_mci_init() fixed
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/Kconfig

@@ -130,6 +130,15 @@ config MACH_PCM027
 
 endchoice
 
+choice
+	prompt "Used baseboard"
+	depends on MACH_PCM027
+
+config MACH_PCM990_BASEBOARD
+	bool "PHYTEC PCM-990 development board"
+
+endchoice
+
 if PXA_SHARPSL
 
 choice

arch/arm/mach-pxa/Makefile

@@ -21,6 +21,7 @@ obj-$(CONFIG_PXA_SHARP_Cxx00)	+= spitz.o corgi_ssp.o corgi_lcd.o sharpsl_pm.o sp
 obj-$(CONFIG_MACH_AKITA)	+= akita-ioexp.o
 obj-$(CONFIG_MACH_POODLE)	+= poodle.o corgi_ssp.o
 obj-$(CONFIG_MACH_PCM027)	+= pcm027.o
+obj-$(CONFIG_MACH_PCM990_BASEBOARD)	+= pcm990-baseboard.o
 obj-$(CONFIG_MACH_TOSA)		+= tosa.o
 obj-$(CONFIG_MACH_EM_X270)	+= em-x270.o
 obj-$(CONFIG_MACH_MAGICIAN)	+= magician.o

arch/arm/mach-pxa/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/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");
+}