diff options
Diffstat (limited to 'arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h')
| -rw-r--r-- | arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h b/arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h new file mode 100644 index 000000000000..1bf56ffa22f9 --- /dev/null +++ b/arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h @@ -0,0 +1,195 @@ +/* + * file: include/asm-blackfin/mach-bf537/bfin_serial_5xx.h + * based on: + * author: + * + * created: + * description: + * blackfin serial driver header files + * 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 +} |