f30ac0ce34
This allows other threads to run when the serial driver polls the CTS PIN in a loop. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
195 lines
5.6 KiB
C
195 lines
5.6 KiB
C
/*
|
|
* file: include/asm-blackfin/mach-bf527/bfin_serial_5xx.h
|
|
* based on:
|
|
* author:
|
|
*
|
|
* created:
|
|
* description:
|
|
* blackfin serial driver head file
|
|
* rev:
|
|
*
|
|
* modified:
|
|
*
|
|
*
|
|
* bugs: enter bugs at http://blackfin.uclinux.org/
|
|
*
|
|
* 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, or (at your option)
|
|
* any later version.
|
|
*
|
|
* this program is distributed in the hope that it will be useful,
|
|
* but without any warranty; without even the implied warranty of
|
|
* merchantability or fitness for a particular purpose. see the
|
|
* gnu general public license for more details.
|
|
*
|
|
* you should have received a copy of the gnu general public license
|
|
* along with this program; see the file copying.
|
|
* if not, write to the free software foundation,
|
|
* 59 temple place - suite 330, boston, ma 02111-1307, usa.
|
|
*/
|
|
|
|
#include <linux/serial.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/portmux.h>
|
|
|
|
#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_SET_IER(uart, v) UART_PUT_IER(uart, UART_GET_IER(uart) | (v))
|
|
#define UART_CLEAR_IER(uart, v) UART_PUT_IER(uart, UART_GET_IER(uart) & ~(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)
|
|
|
|
#define UART_SET_DLAB(uart) do { UART_PUT_LCR(uart, UART_GET_LCR(uart) | DLAB); SSYNC(); } while (0)
|
|
#define UART_CLEAR_DLAB(uart) do { UART_PUT_LCR(uart, UART_GET_LCR(uart) & ~DLAB); SSYNC(); } while (0)
|
|
|
|
#define UART_GET_CTS(x) gpio_get_value(x->cts_pin)
|
|
#define UART_SET_RTS(x) gpio_set_value(x->rts_pin, 1)
|
|
#define UART_CLEAR_RTS(x) gpio_set_value(x->rts_pin, 0)
|
|
#define UART_ENABLE_INTS(x, v) UART_PUT_IER(x, v)
|
|
#define UART_DISABLE_INTS(x) UART_PUT_IER(x, 0)
|
|
|
|
#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 timer_list cts_timer;
|
|
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[BFIN_UART_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
|
|
}
|