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author | Gabor Juhos <juhosg@openwrt.org> | 2013-04-26 16:55:40 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2013-04-26 16:55:40 +0000 |
commit | 2105af06d446c913b2af82ce9c07e2df78952f7a (patch) | |
tree | ce5f52cf76d23ea9617d1b0630fcb709864ddbc9 /target/linux/at91/files/drivers/misc | |
parent | fd01a68863b8207e60b15d1ed33bdf76bfe5c867 (diff) | |
download | master-187ad058-2105af06d446c913b2af82ce9c07e2df78952f7a.tar.gz master-187ad058-2105af06d446c913b2af82ce9c07e2df78952f7a.tar.bz2 master-187ad058-2105af06d446c913b2af82ce9c07e2df78952f7a.zip |
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
Diffstat (limited to 'target/linux/at91/files/drivers/misc')
-rw-r--r-- | target/linux/at91/files/drivers/misc/at91-adc.c | 355 | ||||
-rw-r--r-- | target/linux/at91/files/drivers/misc/at91_adc.h | 62 |
2 files changed, 0 insertions, 417 deletions
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 90ea8181b2..0000000000 --- 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 2d6f01d84a..0000000000 --- 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 - |