mirror of https://gitee.com/openkylin/linux.git
138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
#include <linux/serial.h>
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#include <asm/dma.h>
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#include <asm/portmux.h>
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#define NR_PORTS 1
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#define OFFSET_THR 0x00 /* Transmit Holding register */
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#define OFFSET_RBR 0x00 /* Receive Buffer register */
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#define OFFSET_DLL 0x00 /* Divisor Latch (Low-Byte) */
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#define OFFSET_IER 0x04 /* Interrupt Enable Register */
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#define OFFSET_DLH 0x04 /* Divisor Latch (High-Byte) */
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#define OFFSET_IIR 0x08 /* Interrupt Identification Register */
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#define OFFSET_LCR 0x0C /* Line Control Register */
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#define OFFSET_MCR 0x10 /* Modem Control Register */
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#define OFFSET_LSR 0x14 /* Line Status Register */
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#define OFFSET_MSR 0x18 /* Modem Status Register */
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#define OFFSET_SCR 0x1C /* SCR Scratch Register */
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#define OFFSET_GCTL 0x24 /* Global Control Register */
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#define UART_GET_CHAR(uart) bfin_read16(((uart)->port.membase + OFFSET_RBR))
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#define UART_GET_DLL(uart) bfin_read16(((uart)->port.membase + OFFSET_DLL))
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#define UART_GET_IER(uart) bfin_read16(((uart)->port.membase + OFFSET_IER))
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#define UART_GET_DLH(uart) bfin_read16(((uart)->port.membase + OFFSET_DLH))
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#define UART_GET_IIR(uart) bfin_read16(((uart)->port.membase + OFFSET_IIR))
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#define UART_GET_LCR(uart) bfin_read16(((uart)->port.membase + OFFSET_LCR))
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#define UART_GET_GCTL(uart) bfin_read16(((uart)->port.membase + OFFSET_GCTL))
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#define UART_PUT_CHAR(uart,v) bfin_write16(((uart)->port.membase + OFFSET_THR),v)
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#define UART_PUT_DLL(uart,v) bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
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#define UART_PUT_IER(uart,v) bfin_write16(((uart)->port.membase + OFFSET_IER),v)
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#define UART_PUT_DLH(uart,v) bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
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#define UART_PUT_LCR(uart,v) bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
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#define UART_PUT_GCTL(uart,v) bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
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#ifdef CONFIG_BFIN_UART0_CTSRTS
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# define CONFIG_SERIAL_BFIN_CTSRTS
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# ifndef CONFIG_UART0_CTS_PIN
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# define CONFIG_UART0_CTS_PIN -1
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# endif
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# ifndef CONFIG_UART0_RTS_PIN
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# define CONFIG_UART0_RTS_PIN -1
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# endif
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#endif
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struct bfin_serial_port {
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struct uart_port port;
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unsigned int old_status;
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unsigned int lsr;
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#ifdef CONFIG_SERIAL_BFIN_DMA
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int tx_done;
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int tx_count;
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struct circ_buf rx_dma_buf;
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struct timer_list rx_dma_timer;
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int rx_dma_nrows;
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unsigned int tx_dma_channel;
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unsigned int rx_dma_channel;
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struct work_struct tx_dma_workqueue;
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#else
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# if ANOMALY_05000230
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unsigned int anomaly_threshold;
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# endif
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#endif
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#ifdef CONFIG_SERIAL_BFIN_CTSRTS
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struct work_struct cts_workqueue;
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int cts_pin;
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int rts_pin;
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#endif
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};
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/* The hardware clears the LSR bits upon read, so we need to cache
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* some of the more fun bits in software so they don't get lost
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* when checking the LSR in other code paths (TX).
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*/
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static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
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{
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unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
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uart->lsr |= (lsr & (BI|FE|PE|OE));
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return lsr | uart->lsr;
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}
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static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
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{
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uart->lsr = 0;
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bfin_write16(uart->port.membase + OFFSET_LSR, -1);
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}
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struct bfin_serial_port bfin_serial_ports[NR_PORTS];
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struct bfin_serial_res {
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unsigned long uart_base_addr;
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int uart_irq;
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#ifdef CONFIG_SERIAL_BFIN_DMA
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unsigned int uart_tx_dma_channel;
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unsigned int uart_rx_dma_channel;
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#endif
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#ifdef CONFIG_SERIAL_BFIN_CTSRTS
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int uart_cts_pin;
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int uart_rts_pin;
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#endif
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};
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struct bfin_serial_res bfin_serial_resource[] = {
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{
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0xFFC00400,
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IRQ_UART_RX,
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#ifdef CONFIG_SERIAL_BFIN_DMA
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CH_UART_TX,
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CH_UART_RX,
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#endif
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#ifdef CONFIG_BFIN_UART0_CTSRTS
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CONFIG_UART0_CTS_PIN,
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CONFIG_UART0_RTS_PIN,
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#endif
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}
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};
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#define DRIVER_NAME "bfin-uart"
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int nr_ports = NR_PORTS;
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static void bfin_serial_hw_init(struct bfin_serial_port *uart)
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{
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#ifdef CONFIG_SERIAL_BFIN_UART0
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peripheral_request(P_UART0_TX, DRIVER_NAME);
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peripheral_request(P_UART0_RX, DRIVER_NAME);
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#endif
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#ifdef CONFIG_SERIAL_BFIN_CTSRTS
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if (uart->cts_pin >= 0) {
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gpio_request(uart->cts_pin, DRIVER_NAME);
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gpio_direction_input(uart->cts_pin);
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}
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if (uart->rts_pin >= 0) {
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gpio_request(uart->rts_pin, DRIVER_NAME);
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gpio_direction_input(uart->rts_pin, 0);
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}
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#endif
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}
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