at91: upgrade to kernel 3.8.7 and use devicetree

This upgrades the AT91 target to 3.8.7, and migrates to device tree.
This allows a single kernel to be built for most at91 variants which
simplifies things quite a bit. The immediate result is that all
subtargets are nuked, and any boards without dts files are no longer
supported, though the target now includes more boards than before. The
adc driver was also nuked as 3.8.7 includes a new one under the IIO
subsystem.

Signed-off-by: Adam Porter <porter.adam@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36452 3c298f89-4303-0410-b956-a3cf2f4a3e73

3 files changed, 125 insertions, 417 deletions

diff --git a/target/linux/at91/files/arch/arm/boot/dts/lmu5000.dts b/target/linux/at91/files/arch/arm/boot/dts/lmu5000.dts
new file mode 100644
index 000000000..671f45241
--- /dev/null
+++ b/target/linux/at91/files/arch/arm/boot/dts/lmu5000.dts
@@ -0,0 +1,125 @@
+/*
+ * lmu5000.dst - Device Tree file for CalAmp LMU5000 board
+ *
+ * Copyright (C) 2013 Adam Porter <porter.adam@gmail.com>
+ *
+ * Licensed under GPLv2.
+ */
+/dts-v1/;
+/include/ "at91sam9g20.dtsi"
+
+/ {
+	model = "CalAmp LMU5000";
+	compatible = "calamp,lmu5000", "atmel,at91sam9g20", "atmel,at91sam9";
+
+	chosen {
+		bootargs = "mem=64M console=ttyS0,115200 rootfstype=jffs2";
+	};
+
+	memory {
+		reg = <0x20000000 0x4000000>;
+	};
+
+	clocks {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		main_clock: clock@0 {
+			compatible = "atmel,osc", "fixed-clock";
+			clock-frequency = <18432000>;
+		};
+	};
+
+	ahb {
+		apb {
+			pinctrl@fffff400 {
+				board {
+					pinctrl_pck0_as_mck: pck0_as_mck {
+						atmel,pins =
+							<2 1 0x2 0x0>;	/* PC1 periph B */
+					};
+
+				};
+			};
+
+			dbgu: serial@fffff200 {
+				status = "okay";
+			};
+
+			usart0: serial@fffb0000 {
+				pinctrl-0 =
+					<&pinctrl_usart0
+					 &pinctrl_usart0_rts
+					 &pinctrl_usart0_cts
+					 &pinctrl_usart0_dtr_dsr
+					 &pinctrl_usart0_dcd
+					 &pinctrl_usart0_ri>;
+				status = "okay";
+			};
+
+			usart2: serial@fffb8000 {
+				status = "okay";
+			};
+
+			uart0: serial@fffd4000 {
+				status = "okay";
+			};
+
+			uart1: serial@fffd8000 {
+				status = "okay";
+			};
+
+			macb0: ethernet@fffc4000 {
+				phy-mode = "mii";
+				status = "okay";
+			};
+
+			usb1: gadget@fffa4000 {
+				atmel,vbus-gpio = <&pioC 5 0>;
+				status = "okay";
+			};
+
+			ssc0: ssc@fffbc000 {
+				status = "okay";
+				pinctrl-0 = <&pinctrl_ssc0_tx>;
+			};
+
+			watchdog@fffffd40 {
+				status = "okay";
+			};
+		};
+
+		nand0: nand@40000000 {
+			nand-bus-width = <8>;
+			nand-ecc-mode = "soft";
+			nand-on-flash-bbt;
+			status = "okay";
+
+			kernel@0 {
+				label = "kernel";
+				reg = <0x0 0x400000>;
+			};
+
+			rootfs@400000 {
+				label = "rootfs";
+				reg = <0x400000 0x3C00000>;
+			};
+
+			user1@4000000 {
+				label = "user1";
+				reg = <0x4000000 0x2000000>;
+			};
+
+			user2@6000000 {
+				label = "user2";
+				reg = <0x6000000 0x2000000>;
+			};
+		};
+
+		usb0: ohci@00500000 {
+			num-ports = <2>;
+			status = "okay";
+		};
+	};
+};
diff --git a/target/linux/at91/files/drivers/misc/at91-adc.c b/target/linux/at91/files/drivers/misc/at91-adc.c
deleted file mode 100644
index 90ea8181b..000000000
--- a/target/linux/at91/files/drivers/misc/at91-adc.c
+++ /dev/null
@@ -1,355 +0,0 @@
-/*
- *	Driver for ADC on Atmel AT91 SoC Family
- *
- *	Copyright (C) 2010 Claudio Mignanti - c.mignanti@gmail.com
- *	Based on http://www.at91.com/forum/viewtopic.php/p,9409/#p9409
- *
- *	Copyright (C) 2010 Stefano Barbato - stefano@codesink.org
- *
- *	2010/05/18 Antonio Galea
- *		Sysfs device model, different drivers integration
- *
- *	WISHLIST:
- *	- concurrent access control
- *	- add support for dynamic reconfiguration
- *	- hardware triggers
- *
- *	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.
- *
- * ---------------------------------------------------------------------------
-*/
-
-#include <linux/cdev.h>
-#include <linux/clk.h>
-#include <linux/fs.h>
-#include <linux/gpio.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/kernel.h>
-#include <linux/smp_lock.h>
-
-#include <asm/io.h>
-
-#include "at91_adc.h"
-
-#define DRV_CLASS	"at91_adc"
-
-#define ADC_REQUEST 		1	//un-used atm
-#define ADC_READ		2
-#define ADC_FREE		3
-
-/* Device functions */
-#define at91_adc_read(reg)				ioread32(at91_adc_base + (reg))
-#define at91_adc_write(reg, val)	iowrite32((val), at91_adc_base + (reg))
-#define AT91_DEFAULT_CONFIG			 AT91_ADC_SHTIM	 | \
-																	AT91_ADC_STARTUP | \
-																	AT91_ADC_PRESCAL | \
-																	AT91_ADC_SLEEP
-
-static void at91_adc_device_release(struct device *dev) {}
-
-struct platform_device at91_adc_device = {
-	.name					= "at91_adc",
-	.id						= -1,
-	.dev.release	 = at91_adc_device_release,
-};
-
-struct clk				*at91_adc_clk;
-void __iomem				*at91_adc_base;
-void __iomem				*at91_pioc_base;
-static struct cdev			*at91_adc_cdev	= NULL;
-static dev_t				at91_adc_devno 	= 0;
-static struct class			*at91_adc_class	= NULL;
-
-static int at91_adc_read_chan(int chan){
-	int val, sr;
-
-	if(chan<0 || chan>3){
-		return -EINVAL;
-	}
-	/* disable pull-up resistor */
-	iowrite32(1 << chan, at91_pioc_base + 0x60);
-
-	at91_adc_write(AT91_ADC_CHER,AT91_ADC_CH(chan));	// Enable Channel
-	at91_adc_write(AT91_ADC_CR,AT91_ADC_START);		//Start the ADC
-	
-	for(sr=0; !(sr & AT91_ADC_EOC(chan)); sr=at91_adc_read(AT91_ADC_SR))
-		cpu_relax();
-
-	val=at91_adc_read(AT91_ADC_CHR(chan)) & AT91_ADC_DATA; //Read up to 10 bits
-
-	return val;
-}
-
-/* 	PC0 ->  AD0
-	PC1 -> 	AD1
-	PC2 -> 	AD2
-	PC3 -> 	AD3 */
-static int mux_chan (int chan, int operation) {
-
-	int pin_chan;
-
-	if(chan<0 || chan>3){
-		return -EINVAL;
-	}
-
-	switch (chan) { 
-		case 0:
-			pin_chan=AT91_PIN_PC0;
-			break;
-		case 1:
-			pin_chan=AT91_PIN_PC1;
-			break;
-		case 2:
-			pin_chan=AT91_PIN_PC2;
-			break;
-		case 3:
-			pin_chan=AT91_PIN_PC3;
-			break;
-		default:
-			return -EINVAL;
-	}
-
-	if (operation == 1)		//request_chan
-		at91_set_A_periph(pin_chan, 0);				//Mux PIN to GPIO
-	else					//free_chan
-		at91_set_B_periph(pin_chan, 0);				//Mux PIN to GPIO
-
-	return 0;
-}
-
-static int at91_adc_config(int requested_config){
-	int actual_config;
-
-	at91_adc_write(AT91_ADC_CR,AT91_ADC_SWRST);	 //Reset the ADC
-	at91_adc_write(AT91_ADC_MR,requested_config); //Mode setup
-	actual_config = at91_adc_read(AT91_ADC_MR);	 //Read it back
-
-	return (requested_config==actual_config? 0: -EINVAL);
-}
-
-/* Sysfs interface */
-static ssize_t at91_adc_chanX_show(
-	struct device *dev, struct device_attribute *attr, char *buf ){
-
-	ssize_t status = 0;
-	int		 chan = -1;
-	int		 value;
-
-	if(strlen(attr->attr.name)==5 && strncmp(attr->attr.name,"chan",4)==0){
-		chan = attr->attr.name[4]-'0';
-	}
-
-	if(chan<0 || chan>3){
-		return -EIO;
-	}
-
-	value	= at91_adc_read_chan(chan);
-	status = sprintf(buf, "%d\n", value);
-
-	return status;
-}
-
-static DEVICE_ATTR(chan0, 0444, at91_adc_chanX_show, NULL);
-static DEVICE_ATTR(chan1, 0444, at91_adc_chanX_show, NULL);
-static DEVICE_ATTR(chan2, 0444, at91_adc_chanX_show, NULL);
-static DEVICE_ATTR(chan3, 0444, at91_adc_chanX_show, NULL);
-
-static const struct attribute *at91_adc_dev_attrs[] = {
-	&dev_attr_chan0.attr,
-	&dev_attr_chan1.attr,
-	&dev_attr_chan2.attr,
-	&dev_attr_chan3.attr,
-	NULL,
-};
-
-static const struct attribute_group at91_adc_dev_attr_group = {
-	.attrs = (struct attribute **) at91_adc_dev_attrs,
-};
-
-/* IOCTL interface */
-#ifdef HAVE_UNLOCKED_IOCTL
-static long at91_adc_unlocked_ioctl(
-	struct file *file, unsigned int cmd, unsigned long arg){
-#else
-static int at91_adc_ioctl(
-	struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg){
-#endif
-
-	long retval = 0;
-
-#ifdef HAVE_UNLOCKED_IOCTL
-  lock_kernel();
-#endif
-
-	switch (cmd) {
-		case ADC_REQUEST:
-			retval = mux_chan ((int)arg, 1);
-			break;
-
-		case ADC_READ:
-			retval = at91_adc_read_chan((int)arg);
-			break;
-
-		case ADC_FREE:
-			retval = mux_chan ((int)arg, 0);
-			break;
-
-		default:
-			retval = -EINVAL;
-	}
-
-#ifdef HAVE_UNLOCKED_IOCTL
-  unlock_kernel();
-#endif
-
-	return retval;
-}
-
-struct file_operations at91_adc_fops = {
-	.owner = THIS_MODULE,
-#ifdef HAVE_UNLOCKED_IOCTL
-	.unlocked_ioctl = at91_adc_unlocked_ioctl,
-#else
-	.ioctl = at91_adc_ioctl,
-#endif
-};
-
-static void at91_adc_cdev_teardown(void){
-	if(at91_adc_class){
-		device_destroy(at91_adc_class, at91_adc_devno);
-		class_destroy(at91_adc_class);
-	}
-
-	if(at91_adc_devno){
-		unregister_chrdev_region(at91_adc_devno,1);
-		if(at91_adc_cdev){ cdev_del(at91_adc_cdev); }
-	}
-
-	at91_adc_devno = 0;
-	at91_adc_cdev	= NULL;
-	at91_adc_class = NULL;
-	return;
-}
-
-static int at91_adc_cdev_setup(void){
-
-	int status;
-	/* alloc a new device number (major: dynamic, minor: 0) */
-	status = alloc_chrdev_region(&at91_adc_devno,0,1,at91_adc_device.name);
-
-	if(status){
-		goto err;
-	}
-
-	/* create a new char device */
-	at91_adc_cdev = cdev_alloc();
-	if(at91_adc_cdev == NULL){ status=-ENOMEM; goto err; }
-	at91_adc_cdev->owner = THIS_MODULE;
-	at91_adc_cdev->ops	 = &at91_adc_fops;
-	status = cdev_add(at91_adc_cdev,at91_adc_devno,1);
-	if(status){
-		goto err;
-	}
-	
-	/* register the class */
-	at91_adc_class = class_create(THIS_MODULE, DRV_CLASS);
-	if(IS_ERR(at91_adc_class)){ status=-EFAULT; goto err; }
-	device_create(at91_adc_class, NULL, at91_adc_devno, NULL, at91_adc_device.name);
-	printk(KERN_INFO "Major: %u; minor: %u\n", \
-		MAJOR(at91_adc_devno), MINOR(at91_adc_devno) \
-	);
-
-	return 0;
-
-err:
-	at91_adc_cdev_teardown();
-	return status;
-}
-
-/* Module init/exit */
-static int __init at91_adc_init(void){
-
-	int status;
-
-	at91_adc_clk = clk_get(NULL,"adc_clk");
-	clk_enable(at91_adc_clk);
-
-	at91_adc_base = ioremap(AT91SAM9260_BASE_ADC,SZ_256);
-	if(!at91_adc_base){
-		status=-ENODEV;
-		goto fail_no_iomem_adc;
-	}
-
-	at91_pioc_base = ioremap(AT91_BASE_SYS + AT91_PIOC,SZ_512);
-	if(!at91_pioc_base){
-		status=-ENODEV;
-		goto fail_no_iomem_pioc;
-	}
-
-	status = platform_device_register(&at91_adc_device);
-	if(status){
-		goto fail_no_dev;
-	}
-
-	status = at91_adc_config(AT91_DEFAULT_CONFIG);
-	if(status){
-		goto fail_no_config;
-	}
-
-	status = sysfs_create_group(
-		&(at91_adc_device.dev.kobj), &at91_adc_dev_attr_group
-	);
-
-	if(status){
-		goto fail_no_sysfs;
-	}
-
-	status = at91_adc_cdev_setup();
-	if(status){
-		goto fail_no_cdev;
-	}
-
-	printk(KERN_INFO "Registered device at91_adc.\n");
-	return 0;
-
-fail_no_cdev:
-fail_no_sysfs:
-	// nothing to undo
-fail_no_config:
-	platform_device_unregister(&at91_adc_device);
-fail_no_dev:
-	iounmap(at91_adc_base);
-fail_no_iomem_pioc:
-	iounmap(at91_pioc_base);
-fail_no_iomem_adc:
-	clk_disable(at91_adc_clk);
-	clk_put(at91_adc_clk);
-	return status;
-}
-
-static void __exit at91_adc_exit(void){
-
-	at91_adc_cdev_teardown();
-	platform_device_unregister(&at91_adc_device);
-	iounmap(at91_adc_base);
-	iounmap(at91_pioc_base);
-
-	clk_disable(at91_adc_clk);
-	clk_put(at91_adc_clk);
-
-	printk(KERN_INFO "Unregistered device at91_adc.\n");
-}
-
-module_init(at91_adc_init);
-module_exit(at91_adc_exit);
-
-MODULE_AUTHOR("Paul Kavan");
-MODULE_AUTHOR("Claudio Mignanti");
-MODULE_AUTHOR("Antonio Galea");
-MODULE_AUTHOR("Stefano Barbato");
-MODULE_DESCRIPTION("ADC Driver for the AT91SAM9G20");
-MODULE_LICENSE("GPL");
diff --git a/target/linux/at91/files/drivers/misc/at91_adc.h b/target/linux/at91/files/drivers/misc/at91_adc.h
deleted file mode 100644
index 2d6f01d84..000000000
--- a/target/linux/at91/files/drivers/misc/at91_adc.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * include/asm-arm/arch-at91/at91_adc.h
- *
- * Copyright (C) SAN People
- *
- * Analog-to-Digital Converter (ADC) registers.
- * Based on AT91SAM9260 datasheet revision D.
- *
- * 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.
- */
-
-#ifndef AT91_ADC_H
-#define AT91_ADC_H
-
-#define AT91_ADC_CR		0x00		/* Control Register */
-#define		AT91_ADC_SWRST		(1 << 0)	/* Software Reset */
-#define		AT91_ADC_START		(1 << 1)	/* Start Conversion */
-
-#define AT91_ADC_MR		0x04		/* Mode Register */
-#define		AT91_ADC_TRGEN		(1 << 0)	/* Trigger Enable */
-#define		AT91_ADC_TRGSEL		(7 << 1)	/* Trigger Selection */
-#define			AT91_ADC_TRGSEL_TC0		(0 << 1)
-#define			AT91_ADC_TRGSEL_TC1		(1 << 1)
-#define			AT91_ADC_TRGSEL_TC2		(2 << 1)
-#define			AT91_ADC_TRGSEL_EXTERNAL	(6 << 1)
-#define		AT91_ADC_LOWRES		(1 << 4)	/* Low Resolution */
-#define		AT91_ADC_SLEEP		(1 << 5)	/* Sleep Mode */
-#define		AT91_ADC_PRESCAL	(0x3f << 8)	/* Prescalar Rate Selection */
-#define			AT91_ADC_PRESCAL_(x)	((x) << 8)
-#define		AT91_ADC_STARTUP	(0x1f << 16)	/* Startup Up Time */
-#define			AT91_ADC_STARTUP_(x)	((x) << 16)
-#define		AT91_ADC_SHTIM		(0xf  << 24)	/* Sample & Hold Time */
-#define			AT91_ADC_SHTIM_(x)	((x) << 24)
-
-#define AT91_ADC_CHER		0x10		/* Channel Enable Register */
-#define AT91_ADC_CHDR		0x14		/* Channel Disable Register */
-#define AT91_ADC_CHSR		0x18		/* Channel Status Register */
-#define		AT91_ADC_CH(n)		(1 << (n))	/* Channel Number */
-
-#define AT91_ADC_SR		0x1C		/* Status Register */
-#define		AT91_ADC_EOC(n)		(1 << (n))	/* End of Conversion on Channel N */
-#define		AT91_ADC_OVRE(n)	(1 << ((n) + 8))/* Overrun Error on Channel N */
-#define		AT91_ADC_DRDY		(1 << 16)	/* Data Ready */
-#define		AT91_ADC_GOVRE		(1 << 17)	/* General Overrun Error */
-#define		AT91_ADC_ENDRX		(1 << 18)	/* End of RX Buffer */
-#define		AT91_ADC_RXFUFF		(1 << 19)	/* RX Buffer Full */
-
-#define AT91_ADC_LCDR		0x20		/* Last Converted Data Register */
-#define		AT91_ADC_LDATA		(0x3ff)
-
-#define AT91_ADC_IER		0x24		/* Interrupt Enable Register */
-#define AT91_ADC_IDR		0x28		/* Interrupt Disable Register */
-#define AT91_ADC_IMR		0x2C		/* Interrupt Mask Register */
-
-#define AT91_ADC_CHR(n)		(0x30 + ((n) * 4))	/* Channel Data Register N */
-#define		AT91_ADC_DATA		(0x3ff)
-
-#endif
-