spi.rar_LPC2292_LPC2292 SPI_SPI lpc2292_lpc2292 uclinux_spi

/****************************************Copyright (c)************************************************** ** Guangzou ZLG-MCU Development Co.,LTD. ** graduate school ** http://www.zlgmcu.com ** **--------------File Info------------------------------------------------------------------------------- ** File name: spi.c ** Last modified Date: 2005-04-29 ** Last Version: 1.0 ** Descriptions: This is a Kernel module for uClinux 2.4.x . ** This module let uClinux 2.4.x can use spi. **------------------------------------------------------------------------------------------------------ ** Created by: Chenmingji ** Created date: 2005-04-29 ** Version: 1.0 ** Descriptions: The original version ** **------------------------------------------------------------------------------------------------------ ** Modified by: ** Modified date: ** Version: ** Descriptions: ** ********************************************************************************************************/ #define IN_SPI #include "config.h" /******************************************************************************************************** function announce ********************************************************************************************************/ #if 0 static loff_t spi_llseek(struct file *filp, loff_t off, int whence); #endif static ssize_t spi_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos); static ssize_t spi_read(struct file *filp, char *buf, size_t count, loff_t *f_pos); static int spi_open(struct inode *inode, struct file *filp); static int spi_release(struct inode *inode, struct file *filp); static int spi_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long param); int spi_init(void); void spi_cleanup(void); /******************************************************************************************************** define announce ********************************************************************************************************/ #define MAJOR_NR major module_init(spi_init); module_exit(spi_cleanup); MODULE_PARM(major, "i"); MODULE_LICENSE("Proprietary"); MODULE_DESCRIPTION("Guangzou ZLG-MCU Development Co.,LTD.\ngraduate school\nhttp://www.zlgmcu.com"); MODULE_SUPPORTED_DEVICE("uClinux2.4.x LPC2200 spi"); MODULE_AUTHOR("chenmingji"); /********************************************************************************************************* ** "全局和静态变量在这里定义" ** global variables and static variables define here ********************************************************************************************************/ typedef struct Spi_Dev { u32 BaseAddr; unsigned int usage; /* device using count */ struct semaphore sem; /* mutual exclusion semaphore */ } Spi_Dev; static int major = SPI_MAJOR_NR; static u32 PinSel0Save, PinSel1Save; Spi_Dev SpiDevices[MAX_SPI]; /********************************************************************************************************/ static struct file_operations spi_fops = /* driver info */ { owner: THIS_MODULE, #if 0 llseek: spi_llseek, #endif write: spi_write, read: spi_read, ioctl: spi_ioctl, open: spi_open, release: spi_release, }; #if 0 /********************************************************************************************************* ** Function name: spi_llseek ** Descriptions: move read and write point ** Input: filp: pointer of file ** off: ofset ** whence: move mode ** 0: seek set ** 1: seek file' current point ** 2: seek file' end ** Output : new point ** Created by: Chenmingji ** Created Date: 2005-4-29 **------------------------------------------------------------------------------------------------------- ** Modified by: ** Modified Date: **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static loff_t spi_llseek(struct file *filp, loff_t off, int whence) { return 0; } #endif /********************************************************************************************************* ** Function name: spi_read ** Descriptions: read device ** Input: filp: pointer of file ** buf: buf for save data ** count: size for read ** f_pos: *f_pos = read point ** Output : read size ** Created by: Chenmingji ** Created Date: 2005-4-29 **------------------------------------------------------------------------------------------------------- ** Modified by: ** Modified Date: **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static ssize_t spi_read(struct file *filp, char *buf, size_t count, loff_t *f_pos) { size_t i; unsigned int temp; Spi_Dev *dep; if (!access_ok(VERIFY_WRITE, (void *)buf, _IOC_SIZE(cmd))) { return -EFAULT; } dep = filp->private_data; i = count; do { outl(0, dep->BaseAddr + S0PDR - S0PCR); while (1) { temp = inl(dep->BaseAddr + S0PSR - S0PCR); if ((temp & (1 << 7)) != 0) { break; } if (temp != 0) { goto end; } } temp = inl(dep->BaseAddr + S0PDR - S0PCR); put_user(temp, (u8 *)buf); buf++; } while (--i != 0); end: return count - i; } /********************************************************************************************************* ** Function name: spi_write ** Descriptions: write device ** Input: filp: pointer of file ** buf: buf to write data ** count: size for read ** f_pos: *f_pos = read point ** Output : write size ** Created by: Chenmingji ** Created Date: 2005-4-29 **------------------------------------------------------------------------------------------------------- ** Modified by: ** Modified Date: **------------------------------------------------------------------------------------------------------ ********************************************************************************************************/ static ssize_t spi_write(struct file *filp, const char *buf, size_t count, loff_t *f_pos) { size_t i; unsigned int temp; Spi_Dev *dep; if (!access_ok(VERIFY_READ, (void *)buf, count)) { return -EFAULT; } dep = filp->private_data; i = count; do { get_user(temp, (u8 *)buf); outl(temp, dep->BaseAddr + S0PDR - S0PCR); while (1) { temp = inl(dep->BaseAddr + S0PSR - S0PCR); if ((temp & (1 << 7)) != 0) { break; } if (temp != 0) { goto end; } } inl(dep->BaseAddr + S0PDR - S0PCR); buf++; } while (--i != 0); end: return count - i; } /********************************************************************************************************* ** Function name: spi_open ** Descriptions: open device ** Input:inode: information of device ** filp: pointer of fil