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dm: serial: Add driver model support for ns16550

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Add driver model support so that ns16550 can support operation both with
and without driver model.

The driver needs a clock frequency so cannot stand alone unfortunately. The
clock frequency must be provided by a separate driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2014-09-04 16:27:34 -06:00
parent 8bbe33c829
commit 12e431b277
4 changed files with 218 additions and 3 deletions
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53
include/ns16550.h
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@@ -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
@@ -183,3 +209,30 @@ void NS16550_reinit(NS16550_t com_port, int baud_divisor);
* @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;