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Date: Wed, 12 Aug 2009 18:04:46 +0200
From: "Sander, Tim" <Tim.Sander@....com>
To: <linux-kernel@...r.kernel.org>
Subject: automagic udev device node creation?
Hi
I have written a simple mmap test driver which seems to work so far.=20
The only problem i have, is that no udev device node is automatically =
created?=20
So i really would like to know what part is missing to make udev =
automatically create
the device node?
Everything works alright if i just create the device node by hand.
I suspect that these should be created out of the sysfs information =
created by the module.
I am not on the list, so please cc.
Thanks
Tim
Start of file:
/*
* Memory Map Test Kernel Part
*
* 2009 (C) Tim Sander <tim.sander@....com>
*
* 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 <mach/hardware.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
/* generic values of CSCRXU (Chip Select Control Register X Upper) */
/* (bit_mask & value) << position */
#define CSCRXU_SP(val) ( 0x1 & val) << 31
#define CSCRXU_WP(val) ( 0x1 & val) << 30
#define CSCRXU_BCD(val) ( 0x3 & val) << 28
#define CSCRXU_BCS(val) ( 0xf & val) << 24
#define CSCRXU_PSZ(val) ( 0x3 & val) << 22
#define CSCRXU_PME(val) ( 0x1 & val) << 21
#define CSCRXU_SYNC(val) ( 0x1 & val) << 20
#define CSCRXU_DOL(val) ( 0xf & val) << 16
#define CSCRXU_CNC(val) ( 0x3 & val) << 14
#define CSCRXU_WSC(val) (0x3f & val) << 8
#define CSCRXU_EW(val) ( 0x1 & val) << 7
#define CSCRXU_WWS(val) ( 0x7 & val) << 4
#define CSCRXU_EDC(val) ( 0xf & val) << 0
/* generic values of CSCRXL (Chip Select Control Register X Lower) */
#define CSCRXL_OEA(val) ( 0xf & val) << 28
#define CSCRXL_OEN(val) ( 0xf & val) << 24
#define CSCRXL_EBWA(val) ( 0xf & val) << 20
#define CSCRXL_EBWN(val) ( 0xf & val) << 16
#define CSCRXL_CSA(val) ( 0xf & val) << 12
#define CSCRXL_EBC(val) ( 0x1 & val) << 11
#define CSCRXL_DSZ(val) ( 0x7 & val) << 8
#define CSCRXL_CSN(val) ( 0xf & val) << 4
#define CSCRXL_PSR(val) ( 0x1 & val) << 3
#define CSCRXL_CRE(val) ( 0x1 & val) << 2
#define CSCRXL_WRAP(val) ( 0x1 & val) << 1
#define CSCRXL_CSEN(val) ( 0x1 & val) << 0
/* generic values of CSCRXA (Chip Select Control Register X Additional) */
#define CSCRXA_EBRA(val) ( 0xf & val) << 28
#define CSCRXA_EBRN(val) ( 0xf & val) << 24
#define CSCRXA_RWA(val) ( 0xf & val) << 20
#define CSCRXA_RWN(val) ( 0xf & val) << 16
#define CSCRXA_MUM(val) ( 0x1 & val) << 15
#define CSCRXA_LAH(val) ( 0x3 & val) << 13
#define CSCRXA_LBN(val) ( 0x7 & val) << 10
#define CSCRXA_LBA(val) ( 0x3 & val) << 8
#define CSCRXA_DWW(val) ( 0x3 & val) << 6
#define CSCRXA_DCT(val) ( 0x3 & val) << 4
#define CSCRXA_WWU(val) ( 0x1 & val) << 3
#define CSCRXA_AGE(val) ( 0x3 & val) << 2
#define CSCRXA_CNC2(val) ( 0x1 & val) << 1
#define CSCRXA_FCE(val) ( 0x1 & val) << 0
/* Chip Select 5: CSCR5U value */
#define CSCR5U_VAL 0 \
| CSCRXU_SP(0) \
| CSCRXU_WP(0) \
| CSCRXU_BCD(0) \
| CSCRXU_BCS(0) \
| CSCRXU_PSZ(3) \
| CSCRXU_PME(0) \
| CSCRXU_SYNC(0)\
| CSCRXU_DOL(2) \
| CSCRXU_CNC(3) \
| CSCRXU_WSC(8) \
| CSCRXU_EW(0) \
| CSCRXU_WWS(0) \
| CSCRXU_EDC(0)
/* Chip Select 5: CSCR5L value */
#define CSCR5L_VAL 0 \
| CSCRXL_OEA(0) \
| CSCRXL_OEN(2) \
| CSCRXL_EBWA(0)\
| CSCRXL_EBWN(0)\
| CSCRXL_CSA(0) \
| CSCRXL_EBC(0) \
| CSCRXL_DSZ(5) \
| CSCRXL_CSN(0) \
| CSCRXL_PSR(0) \
| CSCRXL_CRE(0) \
| CSCRXL_WRAP(0)\
| CSCRXL_CSEN(1)
/* Chip Select 5: CSCR5A value */
#define CSCR5A_VAL 0 \
| CSCRXA_EBRA(1)\
| CSCRXA_EBRN(0)\
| CSCRXA_RWA(0) \
| CSCRXA_RWN(0) \
| CSCRXA_MUM(0) \
| CSCRXA_LAH(0) \
| CSCRXA_LBN(2) \
| CSCRXA_LBA(0) \
| CSCRXA_DWW(0) \
| CSCRXA_DCT(0) \
| CSCRXA_WWU(0) \
| CSCRXA_AGE(0) \
| CSCRXA_CNC2(0)\
| CSCRXA_FCE(1)
/* permanent Burst Clock Mode enable */
#define BCM_VAL 0
#define MMAP_MEMSIZE 128*1024
#define WCR IO_ADDRESS(0xB8002060)
#define CSCR0U IO_ADDRESS(0xB8002000)
#define CSCR1U IO_ADDRESS(0xB8002010)
#define CSCR2U IO_ADDRESS(0xB8002020)
#define CSCR3U IO_ADDRESS(0xB8002030)
#define CSCR4U IO_ADDRESS(0xB8002040)
#define CSCR5U IO_ADDRESS(0xB8002050)
#define CSCR0L IO_ADDRESS(0xB8002004)
#define CSCR1L IO_ADDRESS(0xB8002014)
#define CSCR2L IO_ADDRESS(0xB8002024)
#define CSCR3L IO_ADDRESS(0xB8002034)
#define CSCR4L IO_ADDRESS(0xB8002044)
#define CSCR5L IO_ADDRESS(0xB8002054)
#define CSCR0A IO_ADDRESS(0xB8002008)
#define CSCR1A IO_ADDRESS(0xB8002018)
#define CSCR2A IO_ADDRESS(0xB8002028)
#define CSCR3A IO_ADDRESS(0xB8002038)
#define CSCR4A IO_ADDRESS(0xB8002048)
#define CSCR5A IO_ADDRESS(0xB8002058)
/*
0xA0000000 … 0xA7FF_FFFF CS0 memory region R/W = 128MB
0xA8000000 … 0xAFFF_FFFF CS1 memory region R/W = 128MB
0xB0000000 … 0xB1FF_FFFF CS2 memory region R/W = 32MB
0xB2000000 … 0xB3FF_FFFF CS3 memory region R/W = 32MB
0xB4000000 … 0xB5FF_FFFF CS4 memory region R/W = 32MB
0xB6000000 … 0xB7FF_FFFF CS5 memory region R/W = 32MB
*/
#define PHYS_MEM_POS 0xB6000000
static int hbm_mmap_count=1;
static dev_t hbm_mmap_dev;
static struct cdev hbm_mmap_cdev;
static struct platform_device *platform_device;
static struct attribute *hbm_attributes[] = {
NULL
};
static struct attribute_group hbm_attribute_group = {
.attrs = hbm_attributes
};
static ssize_t hbm_mmap_read(struct file *file, char __user *buf, size_t count, loff_t * ppos);
static ssize_t hbm_mmap_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos);
static int hbm_mmap_mmap(struct file *file, struct vm_area_struct *vma);
static struct file_operations hbm_mmap_fops =
{
.owner = THIS_MODULE,
.read = hbm_mmap_read,
.write = hbm_mmap_write,
.mmap = hbm_mmap_mmap,
};
static struct platform_driver hbm_mmap_driver=
{
.driver = {
.name = "hbm",
.owner = THIS_MODULE,
}
};
static int hbm_mmap_mmap(struct file *file, struct vm_area_struct *vma) {
int size=vma->vm_end-vma->vm_start;
if(size>MMAP_MEMSIZE) {
return -EINVAL;
}
vma->vm_flags |= VM_IO |VM_RESERVED;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if(remap_pfn_range(vma, vma->vm_start, __pa(PHYS_MEM_POS)>>PAGE_SHIFT, size, vma->vm_page_prot)) {
//if(remap_pfn_range(vma, vma->vm_start, IO_ADDRESS(PHYS_MEM_POS), size, vma->vm_page_prot)) {
return -EAGAIN;
};
return 0;
}
static ssize_t hbm_mmap_read(struct file *file, char __user *buf, size_t count, loff_t * ppos) {
return -EINVAL;
}
static ssize_t hbm_mmap_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos) {
/* no writes on device for the time beeing */
return -EROFS; //RO FS
}
static int __init hbm_mmap_init(void) {
int err;
if(alloc_chrdev_region(&hbm_mmap_dev, 0, hbm_mmap_count, "hbm%d")) {
err=-ENODEV;
goto err_exit;
}
cdev_init(&hbm_mmap_cdev, &hbm_mmap_fops);
if(cdev_add(&hbm_mmap_cdev, hbm_mmap_dev,hbm_mmap_count)) {
err=-ENODEV;
goto err_dev_unregister;
}
if(platform_driver_register(&hbm_mmap_driver)!=0) {
err=-ENODEV;
goto err_cdev_unregister;
}
platform_device=platform_device_alloc("hbm%d",-1);
if (!platform_device) {
err = -ENOMEM;
goto err_platform_device_alloc;
}
if(platform_device_add(platform_device)) {
goto err_platform_device_add;
}
if(sysfs_create_group(&platform_device->dev.kobj, &hbm_attribute_group)) {
err= -ENODEV;
goto err_create_group;
}
printk(KERN_INFO "hbm mmap loaded successfully\n");
/*
__raw_writel für 32 bit
__raw_writew für 16 bit
__raw_writeb für 8 bit zugriffe
read equivalent
*/
/* Hier werden die Register für CS5 gesetzt */
/*
reg=__raw_readl(WCR);
reg|=(BCM_VAL<<2);
__raw_writel(reg,WCR); */ /* BCLK enable ist böse aka unstabil*/
__raw_writel(CSCR5U_VAL,CSCR5U); /* CS 5 setup */
__raw_writel(CSCR5L_VAL,CSCR5L);
__raw_writel(CSCR5A_VAL,CSCR5A);
printk(KERN_INFO "WEIM registers set up:\n");
printk(KERN_INFO "CSCR5U_VAL = 0x%x\n", CSCR5U_VAL);
printk(KERN_INFO "CSCR5L_VAL = 0x%x\n", CSCR5L_VAL);
printk(KERN_INFO "CSCR5A_VAL = 0x%x\n", CSCR5A_VAL);
printk(KERN_INFO "BCM_VAL = %x\n", BCM_VAL);
return 0;
err_create_group:
platform_device_unregister(platform_device);
err_platform_device_add:
platform_device_put(platform_device);
err_platform_device_alloc:
platform_driver_unregister(&hbm_mmap_driver);
err_cdev_unregister:
cdev_del(&hbm_mmap_cdev);
err_dev_unregister:
unregister_chrdev_region(hbm_mmap_dev, hbm_mmap_count);
err_exit:
return err;
}
static void __exit hbm_mmap_exit(void) {
unsigned int reg;
sysfs_remove_group(&platform_device->dev.kobj, &hbm_attribute_group);
platform_device_unregister(platform_device);
platform_driver_unregister(&hbm_mmap_driver);
cdev_del(&hbm_mmap_cdev);
unregister_chrdev_region(hbm_mmap_dev, hbm_mmap_count);
reg=__raw_readl(WCR);
reg&=~(BCM_VAL<<2);
__raw_writel(reg,WCR); //BCLK enable
printk(KERN_ALERT "hbm mmap unloaded\n");
}
module_init(hbm_mmap_init);
module_exit(hbm_mmap_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("hbm memory map test");
MODULE_AUTHOR("Tim Sander");
MODULE_ALIAS("platform:hbm");
EOF
Hottinger Baldwin Messtechnik GmbH, Im Tiefen See 45, 64293 Darmstadt, Germany | www.hbm.com
Registered as GmbH (German limited liability corporation) in the commercial register at the local court of Darmstadt, HRB 1147
Company domiciled in Darmstadt | CEO: Andreas Huellhorst | Chairman of the board: James Charles Webster
Als Gesellschaft mit beschraenkter Haftung eingetragen im Handelsregister des Amtsgerichts Darmstadt unter HRB 1147
Sitz der Gesellschaft: Darmstadt | Geschaeftsfuehrung: Andreas Huellhorst | Aufsichtsratsvorsitzender: James Charles Webster
The information in this email is confidential. It is intended solely for the addressee. If you are not the intended recipient, please let me know and delete this email.
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