我想配置PWM，代码如下：
#include <linux/delay.h>
#include <linux/poll.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-irq.h>
#include <asm/mach/time.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <asm/io.h>
#include <mach/hardware.h>
#include <mach/regs-gpio.h>
#include <plat/regs-timer.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <mach/gpio.h>
#include <plat/gpio-cfg.h>
#define DEVICE_NAME "aibo_pwm"
#define PWM_IOCTL_SET_FREQ 1
#define PWM_IOCTL_STOP 2
static struct semaphore lock;
#define REMAP_SIZE 0x14
#define PWMTIMER_BASE 0xE2500000
#define TCFG0 (*(volatile unsigned long *)(PWMTIMER_BASE + 0x00))
#define TCFG1 (*(volatile unsigned long *)(PWMTIMER_BASE + 0x04))
#define TCON (*(volatile unsigned long *)(PWMTIMER_BASE + 0x08)) // 控制寄存器
#define TCNTB0 (*(volatile unsigned long *)(PWMTIMER_BASE + 0x0c)) // 计数缓冲寄存器
#define TCMPB0 (*(volatile unsigned long *)(PWMTIMER_BASE + 0x10)) // 比较计数寄存器
/*---------------------------------------------------------------------------------------
Timer 0 Freq=20KHz Duty=0~100%
* human ear : 20Hz~ 20KHz
------------------------------------------------------------------------------------------ */
static void PWM_Set(unsigned int duty)
{
unsigned long tcon;
unsigned long tcnt;
unsigned long tcfg1;
unsigned long tcfg0;
unsigned long tmp; //debug
struct clk *clk_p;
unsigned long pclk;
//get cpu clock
clk_p = clk_get(NULL, "pclk");
pclk = clk_get_rate(clk_p);
/*---------------------------------------------------------
printk() //Debug only
----------------------------------------------------------*/
/*---------------------------------------------------------
Timer0 pwm output
--------------------------------------------------------*/
tcon = readl(TCON);
printk("Tcon=%x\n",tcon); //Only Timer4 is running
tcfg1 = readl(TCFG1);
printk("Tcfg1=%x\n",tcfg1); //All mux=1/2
tcfg0 = readl(TCFG0);
printk("Tcfg0=%x\n",tcfg0); //prescaler0=None,prescaler1=2
/*tcon = __raw_readl(S3C2410_TCON);
printk("Tcon=%x\n",tcon); //Only Timer4 is running
tcfg1 = __raw_readl(S3C2410_TCFG1);
printk("Tcfg1=%x\n",tcfg1); //All mux=1/2
tcfg0 = __raw_readl(S3C2410_TCFG0);
printk("Tcfg0=%x\n",tcfg0); //prescaler0=None,prescaler1=2*/
//set GPB0 as tout0, pwm output mode
//s3c_gpio_cfgpin(S5PV210_GPB(0), S3C_GPIO_SFN(2));
s3c_gpio_cfgpin(S5PV210_GPB(0), 0x02);
//prescaler0= 50
tcfg0 &= ~S3C2410_TCFG_PRESCALER0_MASK;
tcfg0 |= (50 - 1);
//mux0 = 1/2
tcfg1 &= ~S3C2410_TCFG1_MUX0_MASK;
tcfg1 |= S3C2410_TCFG1_MUX0_DIV2;
writel(tcfg0, TCFG0);
writel(tcfg1, TCFG1);
//__raw_writel(tcfg0, S3C2410_TCFG0);
//__raw_writel(tcfg1, S3C2410_TCFG1);
tcnt = (pclk/50)/1000; //Freq=20KHz
writel(tcnt, TCNTB0); //write to Timer0 TCNTB
//__raw_writel(tcnt, S3C2410_TCNTB(0)); //write to Timer0 TCNTB
tmp= readl(TCNTB0);
//tmp= __raw_readl(S3C2410_TCNTB(0));
printk("S3C2410_TCNTB(0)=%x\n",tmp);
writel(duty*tcnt/100,TCMPB0); //write to Timer0 TCMPB
//__raw_writel(duty*tcnt/100, S3C2410_TCMPB(0)); //write to Timer0 TCMPB
tmp= readl(TCMPB0);
//tmp= __raw_readl(S3C2410_TCMPB(0));
printk("S3C2410_TCMPB(0)=%x\n",tmp);
tcon &= ~0x1f;
tcon |= 0xb; //disable deadzone, auto-reload, inv-off, update TCNTB0&TCMPB0, start timer 0
writel(tcon, TCON);
//__raw_writel(tcon, S3C2410_TCON);
tcon &= ~2; //clear manual update bit
writel(tcon, TCON);
//__raw_writel(tcon, S3C2410_TCON);
printk("Tcon=%x\n",tcon);
return 0;
}
void PWM_Stop( void )
{
//TOUT0 OUTPUT
s3c_gpio_cfgpin(S5PV210_GPB(0), S3C_GPIO_OUTPUT);
gpio_set_value(S5PV210_GPB(0), 1);
}
static int s3c24xx_pwm_ioctl(struct file *file, unsigned int cmd, unsigned int duty_tmp)
{
switch (cmd) {
case PWM_IOCTL_SET_FREQ:
PWM_Set(duty_tmp);
break;
case PWM_IOCTL_STOP:
PWM_Stop();
break;
}
/*gpio_set_value(S5PV210_GPB(0), !cmd);
printk(DEVICE_NAME": %d %d\n", duty_tmp, cmd);*/
return 0;
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
//.open = s3c24xx_pwm_open,
//.release = s3c24xx_pwm_close,
.unlocked_ioctl = s3c24xx_pwm_ioctl,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init dev_init(void)
{
int ret;
ret = gpio_request(S5PV210_GPB(0), DEVICE_NAME);
if (ret) {
printk("request GPIO %d for pwm failed\n", S5PV210_GPB(0));
return ret;
}
s3c_gpio_cfgpin(S5PV210_GPB(0), S3C_GPIO_OUTPUT);
gpio_set_value(S5PV210_GPB(0), 0);
//init_MUTEX(&lock);
//sema_init(&lock,1);
ret = misc_register(&misc);
printk (DEVICE_NAME"\tinitialized\n");
return ret;
}
static void __exit dev_exit(void)
{
misc_deregister(&misc);
}
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("FriendlyARM Inc.");
MODULE_DESCRIPTION("S3C2410/S3C2440 PWM Driver");
报错：
[ 11.333523] Unable to handle kernel paging request at virtual address e250008
[ 11.333592] pgd = dbfa4000
[ 11.333617] [e2500008] *pgd=3bc5b811, *pte=00000000, *ppte=00000000
[ 11.333677] Internal error: Oops: 7 [#1] PREEMPT
[ 11.333718] Modules linked in: aibo_pwm aibo_gpio libertas_sdio libertas zd10
[ 11.357023] CPU: 0 Not tainted (3.0.8-FriendlyARM #3)
[ 11.362401] PC is at s3c24xx_pwm_ioctl+0x3c/0x170 [aibo_pwm]
[ 11.368028] LR is at s3c24xx_pwm_ioctl+0x38/0x170 [aibo_pwm]
[ 11.373662] pc : [<bf1e905c>] lr : [<bf1e9058>] psr: 20000013
[ 11.373666] sp : dbf93ef8 ip : 00000000 fp : 00000000
[ 11.385098] r10: dc2086c0 r9 : dbf92000 r8 : c017f7e8
[ 11.390298] r7 : 0000000f r6 : 000003e8 r5 : 000003e8 r4 : e2500000
[ 11.396797] r3 : 00000000 r2 : c08dba38 r1 : c0801ce8 r0 : 03f9c2e0
[ 11.403298] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 11.410403] Control: 10c5387d Table: 3bfa4019 DAC: 00000015
[ 11.416121]
[ 11.416124] SP: 0xdbf93e78:
[ 11.420366] 3e78 dbcd6c00 dbf93ef8 dbf93f78 00000000 dbf93ebc dbf92000 dbf90
[ 11.428512] 3e98 ffffffff dbf93ee4 000003e8 0000000f c017f7e8 c017f12c 03f98
[ 11.436658] 3eb8 c08dba38 00000000 e2500000 000003e8 000003e8 0000000f c0170
[ 11.444804] 3ed8 dc2086c0 00000000 00000000 dbf93ef8 bf1e9058 bf1e905c 2000f
[ 11.452949] 3ef8 bf1e9020 dbf59c00 000003e8 000003e8 0000000f c017f7e8 dc20c
[ 11.461095] 3f18 00000101 00000004 00000000 00000000 00000000 00000020 00000
[ 11.469241] 3f38 0000000f dbf576e4 dbf59c00 00000020 dbf92000 dc2086c0 00008
[ 11.477387] 3f58 c08cc340 dbfb0000 dbf59c00 0000000f dbf59c00 000003e8 0000f
[ 11.485534]
[ 11.485536] R1: 0xc0801c68:
[ 11.489779] 1c68 6b6c6373 636d6d5f 00000000 6b6c6373 63666d5f 00000000 6b6cf
[ 11.497925] 1c88 00000000 6b6c6373 6433675f 00000000 6b6c6373 6973635f 00003
[ 11.506071] 1ca8 6970735f 00000000 6b6c6373 6977705f 00000000 6b6c6373 6d770
[ 11.514217] 1cc8 6b6c6368 656d695f 0000006d 6d6f7273 00000063 5f6b6c63 00741
[ 11.522362] 1ce8 6b6c6370 00000000 00746f72 6765706a 00000000 2d633269 696d0
[ 11.530508] 1d08 696d6468 00000000 6e657674 00000063 00007076 6d697364 0000f
[ 11.538654] 1d28 68627375 0074736f 6f636663 0000006e 73636573 00000073 6b635
[ 11.546800] 1d48 74737973 72656d69 00000000 656d6974 00007372 5f733269 00300
[ 11.554946]
[ 11.554949] R2: 0xc08db9b8:
[ 11.559192] b9b8 c0802e74 ffffffff 00000000 00000000 00000000 00000000 0000c
[ 11.567338] b9d8 c08db9a8 c08dba08 00000000 c08db978 c0802e7c ffffffff 00000
[ 11.575484] b9f8 00000000 00000000 00000000 c018ee4c c08db9d8 c08dba38 00000
[ 11.583630] ba18 c0802e84 ffffffff 00000000 07f385c0 00000000 c08dba68 0000c
[ 11.591775] ba38 c08dba08 c08d9940 00000000 00000000 c0801ce8 ffffffff 00000
[ 11.599921] ba58 00000000 c08dba68 00000000 c018ee4c c018ee5c 00000000 00000
[ 11.608067] ba78 00000000 00000000 00000000 00000000 c07fff4c ffffffff 00000
[ 11.616213] ba98 00000000 00000000 00000000 00000000 00000000 00000000 00000
[ 11.624360]
[ 11.624362] R4: 0xe24fff80:
[ 11.628605] ff80 00000000 00000000 00000000 00000000 00000000 00000000 00000
[ 11.636751] ffa0 00000000 00000000 00000000 00000000 00000000 00000000 00000
[ 11.644897] ffc0 00000000 00000000 00000000 00000000 00000000 00000000 00000
[ 11.653043] ffe0 00000000 00000000 00000000 00000000 00000000 00000000 00000
[ 11.661189] 0000 ******** ******** ******** ******** ******** ******** *****
[ 11.669335] 0020 ******** ******** ******** ******** ******** ******** *****
[ 11.677480] 0040 ******** ******** ******** ******** ******** ******** *****
[ 11.685626] 0060 ******** ******** ******** ******** ******** ******** *****
[ 11.693773]
[ 11.693775] R8: 0xc017f768:
[ 11.698018] f768 e24fee13 3798f107 e28d1008 e3a08000 e357080f e2270000 2a00e
[ 11.706164] f788 e1a02007 e28d1008 e3a00000 eb00082e e28fe014 e1a07000 e28de
[ 11.714310] f7a8 3891000f 3798f107 eaffffef e5ad0008 e1a02007 e1a0100d e3a02
[ 11.722456] f7c8 eaffffb4 e320f000 e320f000 e320f000 e320f000 e320f000 c08dc
[ 11.730602] f7e8 c01ac90c c01a18b8 c017fdf0 c0213c50 c0213cc0 c0213058 c0214
[ 11.738748] f808 c0213080 c0220ef4 c0220cb0 c017fe00 c02129dc c01b8484 c022c
[ 11.746894] f828 c01caabc c01b8484 c01b8484 c02135d0 c01a9ae8 c022f8a4 c01bc
[ 11.755039] f848 c01cae7c c01b8484 c01a856c c01b8484 c01b8484 c01ada34 c01b4
[ 11.763186]
[ 11.763188] R9: 0xdbf91f80:
[ 11.767432] 1f80 0002057f c01a1904 00000001 00000001 401f775c 401f775c 00004
[ 11.775577] 1fa0 00000001 c017f640 00000001 401f775c 00000001 401fd870 00001
[ 11.783723] 1fc0 00000001 401f775c 401f775c 000000f8 00000001 0001d198 0000f
[ 11.791869] 1fe0 00099f14 bebdfc80 00099f30 4015f224 60000010 00000001 00000
[ 11.800015] 2000 00000000 00000002 00000000 dbdef740 c08deb1c 00000000 00000
[ 11.808161] 2020 dbf92000 c08ddf80 c08ddf80 dbdecd00 dbdb4380 00000000 dbf98
[ 11.816307] 2040 c0682188 00000000 00000000 00000000 00000000 00000000 01010
[ 11.824452] 2060 40f564c0 00000000 00000000 00000000 00000000 00000000 00000
[ 11.832599]
[ 11.832601] R10: 0xdc208640:
[ 11.836931] 8640 dead4ead ffffffff ffffffff dc20864c dc20864c 00000000 00008
[ 11.845077] 8660 00000000 00000000 c068d980 000200da c08effb8 00000001 deadf
[ 11.853223] 8680 ffffffff dc208684 dc208684 00000000 dc208690 dc208690 00000
[ 11.861369] 86a0 00000000 00000000 00000000 ffffffff ffffffff dc6fb990 dc208
[ 11.869515] 86c0 000021b0 00000000 00000000 c0949f80 dbde5400 00000001 deadf
[ 11.877660] 86e0 ffffffff 00000000 00000007 00000001 00000001 dead4ead fffff
[ 11.885806] 8700 dc208700 dc208700 00000000 00000000 dc2086ec 00000000 00000
[ 11.893952] 8720 dc208720 dc208720 dc208728 dc208728 dc207df0 dc209070 dc208
[ 11.902100] Process test2 (pid: 1167, stack limit = 0xdbf922f0)
[ 11.907993] Stack: (0xdbf93ef8 to 0xdbf94000)
[ 11.912327] 3ee0: bf1e0
[ 11.920475] 3f00: 000003e8 000003e8 0000000f c017f7e8 dc2086c0 c02227fc 00004
[ 11.928620] 3f20: 00000000 00000000 00000000 00000020 00000001 dbf576c0 00004
[ 11.936767] 3f40: dbf59c00 00000020 dbf92000 dc2086c0 00000000 c0211e78 c08c0
[ 11.944913] 3f60: dbf59c00 0000000f dbf59c00 000003e8 00000001 0000000f c0170
[ 11.953058] 3f80: 00000000 c0222d6c dbf92000 00000000 be856bcc be856b24 00010
[ 11.961204] 3fa0: 00000036 c017f640 be856b24 000161b8 0000000f 00000001 00004
[ 11.969350] 3fc0: be856b24 000161b8 be856bb0 00000036 00000000 00000000 400f0
[ 11.977496] 3fe0: 00000000 be856b18 0000aedc 40ed74ec 60000010 0000000f 3fff1
[ 11.985670] [<bf1e905c>] (s3c24xx_pwm_ioctl+0x3c/0x170 [aibo_pwm]) from [<c0)
[ 11.995611] [<c02227fc>] (do_vfs_ioctl+0x80/0x5b8) from [<c0222d6c>] (sys_io)
[ 12.003844] [<c0222d6c>] (sys_ioctl+0x38/0x60) from [<c017f640>] (ret_fast_s)
[ 12.012247] Code: e1a04000 eb3e982a eb3e9791 e34e4250 (e5943008)
[ 12.019549] ---[ end trace e84a0a3985a0941d ]---
[ 19.524174] eth0: no IPv6 routers present
请求帮忙，谢谢！
