RK3399-Wk2114串口扩展驱动_RK3399串口扩展_wk2114

/* * WKIC Ltd. * By David Tech * DEMO Version :1.0 Data:2020-2-25 * * * * 1. compiler warnings all changes */ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/console.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/freezer.h> #include <linux/timer.h> #include <linux/of_gpio.h> #include <linux/gpio.h> #include <linux/workqueue.h> #include <linux/platform_device.h> //#include <asm/mach/map.h> #include <linux/regmap.h> #include <asm/irq.h> #include <asm/io.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/fcntl.h> #include <linux/unistd.h> #include <uapi/asm/unistd.h> #include <linux/termios.h> #include <linux/interrupt.h> #include <linux/of.h> #include <linux/printk.h> #include <linux/miscdevice.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/sysfs.h> #include <linux/miscdevice.h> #include <linux/uaccess.h> #include <linux/mutex.h> #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/clk.h> #include <linux/serial.h> #include "wk2xxx.h" //#define _DEBUG_RK_FUNCTION //#define _DEBUG_WK_FUNCTION //#define _DEBUG_WK_RX //#define _DEBUG_WK_TX //#define _DEBUG_WK_IRQ //#define _DEBUG_WK_VALUE //#define _DEBUG_WK_FIFO //#define _DEBUG_WK_TEST //#define WK_RS485_FUNCTION //#define WK_FIFO_FUNCTION #define CONFIG_DEVFS_FS #define WK2XXX_PAGE1 1 #define WK2XXX_PAGE0 0 #define WK2XXX_STATUS_PE 1 #define WK2XXX_STATUS_FE 2 #define WK2XXX_STATUS_BRK 4 #define WK2XXX_STATUS_OE 8 ///////////////////////////////////////// /**RK3288 uart offset***/ #define UART1RK_RX 0x00 #define UART1RK_TX 0x00 #define UART1RK_DLL 0x00 #define UART1RK_DLH 0x04 #define UART1RK_IER 0x04 #define UART1RK_IIR 0x08 #define UART1RK_FCR 0x08 #define UART1RK_LCR 0x0C #define UART1RK_MCR 0x10 #define UART1RK_LSR 0x14 #define UART1RK_MSR 0x18 #define UART1RK_SCR 0x1C #define UART1RK_SRBR 0x30 #define UART1RK_STHR 0x30 #define UART1RK_FAR 0x70 #define UART1RK_TFR 0x74 #define UART1RK_RFW 0x78 #define UART1RK_USR 0x7C #define UART1RK_TFL 0x80 #define UART1RK_RFL 0x84 #define UART1RK_SRR 0x88 #define UART1RK_SRTS 0x8C #define UART1RK_SBCR 0x90 #define UART1RK_SDMAM 0x94 #define UART1RK_SFE 0x98 #define UART1RK_SRT 0x9C #define UART1RK_STET 0xA0 #define UART1RK_HTX 0xA4 #define UART1RK_DMASA 0xA8 #define UART1RK_CPR 0xF4 #define UART1RK_UCV 0xF8 #define UART1RK_CTR 0xFC /***************************/ static DEFINE_MUTEX(wk2xxxs_lock); /* race on probe */ static DEFINE_MUTEX(wk2xxxs_wr_lock); static DEFINE_MUTEX(wk2xxs_work_lock); /* work on probe */ static DEFINE_MUTEX(wk2xxxs_global_lock); ////static struct uart_driver rk_uart_reg; /************************ROCHCHIP*************START*************************/ #define CONFIG_CLOCK_CTRL #define PORT_RK 90 #define DBG_PORT 1 //DBG_PORT which uart is used to print log message #ifdef CONFIG_OF struct of_rk_serial { unsigned int id; unsigned int use_dma; unsigned int uartclk; unsigned int uartbaud; }; #endif struct uart_rk_port { struct uart_port port; struct platform_device *pdev; struct clk *clk; struct clk *pclk; unsigned int tx_loadsz; /* transmit fifo load size */ unsigned char ier; unsigned char lcr; unsigned char mcr; unsigned char iir; unsigned char fcr; /* * Some bits in registers are cleared on a read, so they must * be saved whenever the register is read but the bits will not * be immediately processed. */ #define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS unsigned char lsr_saved_flags; #if 0 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA unsigned char msr_saved_flags; #endif char name[16]; char fifo[64]; char fifo_size; unsigned long port_activity; struct work_struct uart_work; struct work_struct uart_work_rx; struct workqueue_struct *uart_wq; struct rk_uart_dma *dma; }; struct uart_rk_port *g_uart_port;; static inline unsigned int serial_in(struct uart_rk_port *up, int offset) { //offset = offset << 2; // printk(KERN_ALERT "%s! address=0x%x!!\n",__func__,up->port.membase + offset); return __raw_readl(up->port.membase + offset); } /* Save the LCR value so it can be re-written when a Busy Detect IRQ occurs. */ static inline void dwapb_save_out_value(struct uart_rk_port *up, int offset, unsigned char value) { if (offset == UART1RK_LCR) up->lcr = value; } /* Read the IER to ensure any interrupt is cleared before returning from ISR. */ static inline void dwapb_check_clear_ier(struct uart_rk_port *up, int offset) { if (offset == UART1RK_TX || offset == UART1RK_IER) serial_in(up, UART1RK_IER); } static inline void serial_out(struct uart_rk_port *up, int offset, unsigned char value) { dwapb_save_out_value(up, offset, value); __raw_writel(value, up->port.membase + (offset )); if (offset != UART1RK_TX) dsb(); dwapb_check_clear_ier(up, offset); } /* Uart divisor latch read */ static inline int serial_dl_read(struct uart_rk_port *up) { return serial_in(up, UART1RK_DLL) | serial_in(up, UART1RK_DLH) << 8; } /* Uart divisor latch write */ static int serial_dl_write(struct uart_rk_port *up, unsigned int value) { unsigned int tmout = 100; while(!(serial_in(up, UART1RK_LCR) & 0x80)){ if (--tmout == 0){ if(up->port.line != DBG_PORT) printk(KERN_ALERT"set serial.%d baudrate fail with DLAB not set\n", up->port.line); return -1; } } tmout = 15000; while(serial_in(up, UART1RK_USR) & 0x01){ if (--tmout == 0){ if(up->port.line != DBG_PORT) printk(KERN_ALERT "set serial.%d baudrate timeout\n", up->port.line); return -1; } udelay(1); } serial_out(up, UART1RK_DLL, value & 0xff); serial_out(up, UART1RK_DLH, value >> 8 & 0xff); return 0; } static int rk32_uart_dump_register(struct uart_rk_port *up) { unsigned int reg_value = 0; reg_value =serial_dl_read(up); printk(KERN_ALERT "%s!!--UART1RK_DLL and DLH =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_IER); printk(KERN_ALERT "%s!!--UART1RK_IER =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_IIR); printk(KERN_ALERT "%s!!--UART1RK_IIR =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_LSR); printk(KERN_ALERT "%s!!--UART1RK_LSR =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_MSR); printk(KERN_ALERT "%s!!--UART1RK_MSR =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_MCR); printk(KERN_ALERT "%s!!--UART1RK_MCR =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_SCR); printk(KERN_ALERT "%s!!--UART1RK_SCR =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_LCR); printk(KERN_ALERT "%s!!--UART1RK_LCR =0x:%X-\n", __func__,reg_value); reg_value = serial_in(up, UART1RK_USR); printk(KERN_ALERT "%s!!--UART1RK_USR =0x:%X-\n", __func__,reg_value); return 0; } static int serial_lcr_write(struct uart_rk_port *up, unsigned char value) { unsigned int tmout = 15000; while(serial_in(up, UART1RK_USR) & 0X01){ if (--tmout == 0){ if(up->port.line != DBG_PORT) printk(KERN_ALERT"set serial.%d lcr = 0x%02x timeout\n", up->port.line, value); return -1; } udelay(1); } serial_out(up, UART1RK_LCR, value); return 0; } void uart_putc(struct uart_rk_port *up,unsigned char ch) { int timeout=500; while(!(serial_in(up, UART1RK_LSR)&0x40)&&timeout) timeout--; serial_out(up, UART1RK_TX ,ch); t