diff options
Diffstat (limited to 'include/ns16550.h')
| -rw-r--r-- | include/ns16550.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/include/ns16550.h b/include/ns16550.h index d1f3a90..5784cfd 100644 --- a/include/ns16550.h +++ b/include/ns16550.h @@ -23,6 +23,14 @@ #include <linux/types.h> +#ifdef CONFIG_DM_SERIAL +/* + * For driver model we always use one byte per register, and sort out the + * differences in the driver + */ +#define CONFIG_SYS_NS16550_REG_SIZE (-1) +#endif + #if !defined(CONFIG_SYS_NS16550_REG_SIZE) || (CONFIG_SYS_NS16550_REG_SIZE == 0) #error "Please define NS16550 registers size." #elif defined(CONFIG_SYS_NS16550_MEM32) @@ -37,6 +45,21 @@ unsigned char postpad_##x[-CONFIG_SYS_NS16550_REG_SIZE - 1]; #endif +/** + * struct ns16550_platdata - information about a NS16550 port + * + * @base: Base register address + * @reg_shift: Shift size of registers (0=byte, 1=16bit, 2=32bit...) + * @clock: UART base clock speed in Hz + */ +struct ns16550_platdata { + unsigned char *base; + int reg_shift; + int clock; +}; + +struct udevice; + struct NS16550 { UART_REG(rbr); /* 0 */ UART_REG(ier); /* 1 */ @@ -65,6 +88,9 @@ struct NS16550 { UART_REG(scr); /* 10*/ UART_REG(ssr); /* 11*/ #endif +#ifdef CONFIG_DM_SERIAL + struct ns16550_platdata *plat; +#endif }; #define thr rbr @@ -170,3 +196,43 @@ void NS16550_putc(NS16550_t com_port, char c); char NS16550_getc(NS16550_t com_port); int NS16550_tstc(NS16550_t com_port); void NS16550_reinit(NS16550_t com_port, int baud_divisor); + +/** + * ns16550_calc_divisor() - calculate the divisor given clock and baud rate + * + * Given the UART input clock and required baudrate, calculate the divisor + * that should be used. + * + * @port: UART port + * @clock: UART input clock speed in Hz + * @baudrate: Required baud rate + * @return baud rate divisor that should be used + */ +int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate); + +/** + * ns16550_serial_ofdata_to_platdata() - convert DT to platform data + * + * Decode a device tree node for an ns16550 device. This includes the + * register base address and register shift properties. The caller must set + * up the clock frequency. + * + * @dev: dev to decode platform data for + * @return: 0 if OK, -EINVAL on error + */ +int ns16550_serial_ofdata_to_platdata(struct udevice *dev); + +/** + * ns16550_serial_probe() - probe a serial port + * + * This sets up the serial port ready for use, except for the baud rate + * @return 0, or -ve on error + */ +int ns16550_serial_probe(struct udevice *dev); + +/** + * struct ns16550_serial_ops - ns16550 serial operations + * + * These should be used by the client driver for the driver's 'ops' member + */ +extern const struct dm_serial_ops ns16550_serial_ops; |