acbcd26319
signef-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
152 lines
4.5 KiB
C
152 lines
4.5 KiB
C
#include <linux/serial.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/portmux.h>
|
|
|
|
#define NR_PORTS 2
|
|
|
|
#define OFFSET_THR 0x00 /* Transmit Holding register */
|
|
#define OFFSET_RBR 0x00 /* Receive Buffer register */
|
|
#define OFFSET_DLL 0x00 /* Divisor Latch (Low-Byte) */
|
|
#define OFFSET_IER 0x04 /* Interrupt Enable Register */
|
|
#define OFFSET_DLH 0x04 /* Divisor Latch (High-Byte) */
|
|
#define OFFSET_IIR 0x08 /* Interrupt Identification Register */
|
|
#define OFFSET_LCR 0x0C /* Line Control Register */
|
|
#define OFFSET_MCR 0x10 /* Modem Control Register */
|
|
#define OFFSET_LSR 0x14 /* Line Status Register */
|
|
#define OFFSET_MSR 0x18 /* Modem Status Register */
|
|
#define OFFSET_SCR 0x1C /* SCR Scratch Register */
|
|
#define OFFSET_GCTL 0x24 /* Global Control Register */
|
|
|
|
#define UART_GET_CHAR(uart) bfin_read16(((uart)->port.membase + OFFSET_RBR))
|
|
#define UART_GET_DLL(uart) bfin_read16(((uart)->port.membase + OFFSET_DLL))
|
|
#define UART_GET_IER(uart) bfin_read16(((uart)->port.membase + OFFSET_IER))
|
|
#define UART_GET_DLH(uart) bfin_read16(((uart)->port.membase + OFFSET_DLH))
|
|
#define UART_GET_IIR(uart) bfin_read16(((uart)->port.membase + OFFSET_IIR))
|
|
#define UART_GET_LCR(uart) bfin_read16(((uart)->port.membase + OFFSET_LCR))
|
|
#define UART_GET_LSR(uart) bfin_read16(((uart)->port.membase + OFFSET_LSR))
|
|
#define UART_GET_GCTL(uart) bfin_read16(((uart)->port.membase + OFFSET_GCTL))
|
|
|
|
#define UART_PUT_CHAR(uart, v) bfin_write16(((uart)->port.membase + OFFSET_THR), v)
|
|
#define UART_PUT_DLL(uart, v) bfin_write16(((uart)->port.membase + OFFSET_DLL), v)
|
|
#define UART_PUT_IER(uart, v) bfin_write16(((uart)->port.membase + OFFSET_IER), v)
|
|
#define UART_PUT_DLH(uart, v) bfin_write16(((uart)->port.membase + OFFSET_DLH), v)
|
|
#define UART_PUT_LCR(uart, v) bfin_write16(((uart)->port.membase + OFFSET_LCR), v)
|
|
#define UART_PUT_GCTL(uart, v) bfin_write16(((uart)->port.membase + OFFSET_GCTL), v)
|
|
|
|
#if defined(CONFIG_BFIN_UART0_CTSRTS) || defined(CONFIG_BFIN_UART1_CTSRTS)
|
|
# define CONFIG_SERIAL_BFIN_CTSRTS
|
|
|
|
# ifndef CONFIG_UART0_CTS_PIN
|
|
# define CONFIG_UART0_CTS_PIN -1
|
|
# endif
|
|
|
|
# ifndef CONFIG_UART0_RTS_PIN
|
|
# define CONFIG_UART0_RTS_PIN -1
|
|
# endif
|
|
|
|
# ifndef CONFIG_UART1_CTS_PIN
|
|
# define CONFIG_UART1_CTS_PIN -1
|
|
# endif
|
|
|
|
# ifndef CONFIG_UART1_RTS_PIN
|
|
# define CONFIG_UART1_RTS_PIN -1
|
|
# endif
|
|
#endif
|
|
/*
|
|
* The pin configuration is different from schematic
|
|
*/
|
|
struct bfin_serial_port {
|
|
struct uart_port port;
|
|
unsigned int old_status;
|
|
#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
int tx_done;
|
|
int tx_count;
|
|
struct circ_buf rx_dma_buf;
|
|
struct timer_list rx_dma_timer;
|
|
int rx_dma_nrows;
|
|
unsigned int tx_dma_channel;
|
|
unsigned int rx_dma_channel;
|
|
struct work_struct tx_dma_workqueue;
|
|
#else
|
|
struct work_struct cts_workqueue;
|
|
#endif
|
|
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
|
|
int cts_pin;
|
|
int rts_pin;
|
|
#endif
|
|
};
|
|
|
|
struct bfin_serial_port bfin_serial_ports[NR_PORTS];
|
|
struct bfin_serial_res {
|
|
unsigned long uart_base_addr;
|
|
int uart_irq;
|
|
#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
unsigned int uart_tx_dma_channel;
|
|
unsigned int uart_rx_dma_channel;
|
|
#endif
|
|
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
|
|
int uart_cts_pin;
|
|
int uart_rts_pin;
|
|
#endif
|
|
};
|
|
|
|
struct bfin_serial_res bfin_serial_resource[] = {
|
|
#ifdef CONFIG_SERIAL_BFIN_UART0
|
|
{
|
|
0xFFC00400,
|
|
IRQ_UART0_RX,
|
|
#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
CH_UART0_TX,
|
|
CH_UART0_RX,
|
|
#endif
|
|
#ifdef CONFIG_BFIN_UART0_CTSRTS
|
|
CONFIG_UART0_CTS_PIN,
|
|
CONFIG_UART0_RTS_PIN,
|
|
#endif
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SERIAL_BFIN_UART1
|
|
{
|
|
0xFFC02000,
|
|
IRQ_UART1_RX,
|
|
#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
CH_UART1_TX,
|
|
CH_UART1_RX,
|
|
#endif
|
|
#ifdef CONFIG_BFIN_UART1_CTSRTS
|
|
CONFIG_UART1_CTS_PIN,
|
|
CONFIG_UART1_RTS_PIN,
|
|
#endif
|
|
},
|
|
#endif
|
|
};
|
|
|
|
int nr_ports = ARRAY_SIZE(bfin_serial_resource);
|
|
|
|
#define DRIVER_NAME "bfin-uart"
|
|
|
|
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
|
|
{
|
|
|
|
#ifdef CONFIG_SERIAL_BFIN_UART0
|
|
peripheral_request(P_UART0_TX, DRIVER_NAME);
|
|
peripheral_request(P_UART0_RX, DRIVER_NAME);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SERIAL_BFIN_UART1
|
|
peripheral_request(P_UART1_TX, DRIVER_NAME);
|
|
peripheral_request(P_UART1_RX, DRIVER_NAME);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
|
|
if (uart->cts_pin >= 0) {
|
|
gpio_request(uart->cts_pin, DRIVER_NAME);
|
|
gpio_direction_input(uart->cts_pin);
|
|
}
|
|
|
|
if (uart->rts_pin >= 0) {
|
|
gpio_request(uart->rts_pin, DRIVER_NAME);
|
|
gpio_direction_output(uart->rts_pin, 0);
|
|
}
|
|
#endif
|
|
}
|