mcs9900_linux驱动

/* * linux/drivers/serial/99xx.c * * Based on drivers/serial/8250.c by Russell King. * * 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. * * This code is modified to support moschip 99xx series serial devices by ravikanthg@moschip.com */ #include <linux/version.h> #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,15) #include <linux/config.h> #endif #if defined(CONFIG_SERIAL_99xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) #define SUPPORT_SYSRQ #endif #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/console.h> #include <linux/sysrq.h> #include <linux/mca.h> #include <linux/sched.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_reg.h> #include <linux/serial_core.h> #include <linux/serial.h> #include <linux/nmi.h> #include <linux/bitops.h> #include <asm/byteorder.h> #include <asm/io.h> #include <asm/irq.h> #include "99xx.h" #define NORMAL_MODE 1 #define CASCADE_MODE 2 #define UART99xx_NR 16 //All transactions are with memory mapped registers #define MEM_AXS 1 /* * Definitions for PCI support. */ #define FL_BASE_MASK 0x0007 #define FL_BASE0 0x0000 #define FL_BASE1 0x0001 #define FL_BASE2 0x0002 #define FL_BASE3 0x0003 #define FL_BASE4 0x0004 #define FL_GET_BASE(x) (x & FL_BASE_MASK) #if 0 #define DEBUG(fmt...) DEBUG(fmt) #else #define DEBUG(fmt...) do { } while (0) #endif //choose mode either as NORMAL_MODE or CASCADE_MODE int mode = CASCADE_MODE;//NORMAL_MODE struct uart_99xx_port { struct uart_port port; spinlock_t lock_99xx; //Per port lock int tx_dma; //Variable to serialise the start_tx calls in dma mode unsigned int dma_tx; //TX DMA enable or not unsigned int dma_rx; //RX DMA enable or not u8 ier; //Interrupt Enable Register u8 lcr; //Line Control Register u8 mcr; //Modem Control Register u8 acr; //Additional Control Register unsigned int capabilities; //port capabilities int rxfifotrigger; int txfifotrigger; u32 dma_tx_cnt; //Amount of data to be DMA in TX u32 dma_rx_cnt; //Amount of data to be DMA in RX char * dma_tx_buf_v; //Virtual Address of DMA Buffer for TX dma_addr_t dma_tx_buf_p; //Physical Address of DMA Buffer for TX char * dma_rx_buf_v; //Virtual Address of DMA Buffer for RX dma_addr_t dma_rx_buf_p; //Physical Address of DMA Buffer for TX u32 part_done_recv_cnt; //RX DMA CIRC buffer Read index int rx_dma_done_cnt; int uart_mode; //SERIAL TYPE int flow_control; //Flow control is enabled or not int flow_ctrl_type; //Type of Flow control u8 x_on; //X-ON Character u8 x_off; //X-OFF Character u32 ser_dcr_din_reg; //Device control register u32 ser_ven_reg; //Vendor register struct uart_99xx_port *next_port; struct uart_99xx_port *prev_port; }; static struct uart_99xx_port serial99xx_ports[UART99xx_NR]; static int test_mode=0;// Make it default to 0 after testing static int nr_funs = 4; struct uart_99xx_contxt{ int rx_dma_en; //0-I/O mode of RX //1 -DMA mode of RX int tx_dma_en; //0-I/O mode of TX //1 -DMA mode of TX int uart_mode; //MCS99XX_RS232_MODE //MCS99XX_RS422_MODE //MCS99XX_RS485_HALF_DUPLEX //MCS99XX_RS485_FULL_DUPLEX int en_flow_control; //0 - No H/W Flow Control //1 - H/W Flow Control int flow_ctrl_type; //MCS99XX_DTR_DSR_HW_FLOWCONTROL //MCS99XX_XON_XOFF_HW_FLOWCONTROL //MCS99XX_RTS_CTS_HW_FLOWCONTROL int rxfifotrigger; //0-127 int txfifotrigger; //0-127 int x_on; int x_off; }; static struct uart_99xx_contxt uart_99xx_contxts[] = { //Port 0 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL,//MCS99XX_RTS_CTS_HW_FLOWCONTROL, .rxfifotrigger = 64, .txfifotrigger = 64, .x_on = SERIAL_DEF_XON, .x_off = SERIAL_DEF_XOFF, }, //Port 1 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL,//MCS99XX_RTS_CTS_HW_FLOWCONTROL, .rxfifotrigger = 64, .txfifotrigger = 64, .x_on= SERIAL_DEF_XON, .x_off= SERIAL_DEF_XOFF, }, //Port 2 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL,//MCS99XX_RTS_CTS_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 3 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL,//MCS99XX_RTS_CTS_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 4 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL,//MCS99XX_RTS_CTS_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 5 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_DTR_DSR_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 6 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 7 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 8 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 9 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 10 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 11 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 12 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XOFF_HW_FLOWCONTROL, .rxfifotrigger=64, .txfifotrigger=64, .x_on=SERIAL_DEF_XON, .x_off=SERIAL_DEF_XOFF, }, //Port 13 { .rx_dma_en = 0, .tx_dma_en = 0, .uart_mode = MCS99XX_RS232_MODE, .en_flow_control= 0, .flow_ctrl_type = MCS99XX_XON_XO