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serial: ns16550: Support run-time configuration

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At present this driver uses an assortment of CONFIG options to control
how it accesses the hardware. This is painful for platforms that are
supposed to be controlled by a device tree or a previous-stage bootloader.

Add a new CONFIG option to enable fully dynamic configuration. This
controls register spacing, size, offset and endianness.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Aiden Park <aiden.park@intel.com>
Tested-by: Aiden Park <aiden.park@intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: squashed in http://patchwork.ozlabs.org/patch/1232929/]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2019-12-19 17:58:18 -07:00
committed by Bin Meng
parent 31a790bee9
commit 62cbde4c4e
3 changed files with 107 additions and 9 deletions
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16
include/ns16550.h
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@@ -31,6 +31,9 @@
#define CONFIG_SYS_NS16550_REG_SIZE (-1)
#endif
#ifdef CONFIG_NS16550_DYNAMIC
#define UART_REG(x) unsigned char x
#else
#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) && !defined(CONFIG_DM_SERIAL)
@@ -44,14 +47,24 @@
unsigned char x; \
unsigned char postpad_##x[-CONFIG_SYS_NS16550_REG_SIZE - 1];
#endif
#endif /* CONFIG_NS16550_DYNAMIC */
enum ns16550_flags {
NS16550_FLAG_IO = 1 << 0, /* Use I/O access (else mem-mapped) */
NS16550_FLAG_ENDIAN = 1 << 1, /* Use out_le/be_32() */
NS16550_FLAG_BE = 1 << 2, /* Big-endian access (else little) */
};
/**
* struct ns16550_platdata - information about a NS16550 port
*
* @base: Base register address
* @reg_width: IO accesses size of registers (in bytes)
* @reg_width: IO accesses size of registers (in bytes, 1 or 4)
* @reg_shift: Shift size of registers (0=byte, 1=16bit, 2=32bit...)
* @reg_offset: Offset to start of registers (normally 0)
* @clock: UART base clock speed in Hz
* @fcr: Offset of FCR register (normally UART_FCR_DEFVAL)
* @flags: A few flags (enum ns16550_flags)
* @bdf: PCI slot/function (pci_dev_t)
*/
struct ns16550_platdata {
@@ -61,6 +74,7 @@ struct ns16550_platdata {
int reg_offset;
int clock;
u32 fcr;
int flags;
#if defined(CONFIG_PCI) && defined(CONFIG_SPL)
int bdf;
#endif