#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_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;
unsigned int lsr;
#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;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct work_struct cts_workqueue;
int cts_pin;
int rts_pin;
#endif
};
/* The hardware clears the LSR bits upon read, so we need to cache
* some of the more fun bits in software so they don't get lost
* when checking the LSR in other code paths (TX).
*/
static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
{
unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
uart->lsr |= (lsr & (BI|FE|PE|OE));
return lsr | uart->lsr;
}
static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
{
uart->lsr = 0;
bfin_write16(uart->port.membase + OFFSET_LSR, -1);
}
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
}
