/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Debugging macro include header
 *
 *  Copyright (C) 1994-1999 Russell King
 *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
*/

#include <linux/serial_reg.h>

/* External port on Zoom2/3 */
#define ZOOM_UART_BASE          0x10000000
#define ZOOM_UART_VIRT          0xfa400000

#define OMAP_PORT_SHIFT         2
#define ZOOM_PORT_SHIFT         1

#define UART_OFFSET(addr)       ((addr) & 0x00ffffff)

                .pushsection .data
                .align  2
omap_uart_phys: .word   0
omap_uart_virt: .word   0
omap_uart_lsr:  .word   0
                .popsection

                .macro  addruart, rp, rv, tmp

                /* Use omap_uart_phys/virt if already configured */
10:             adr     \rp, 99f                @ get effective addr of 99f
                ldr     \rv, [\rp]              @ get absolute addr of 99f
                sub     \rv, \rv, \rp           @ offset between the two
                ldr     \rp, [\rp, #4]          @ abs addr of omap_uart_phys
                sub     \tmp, \rp, \rv          @ make it effective
                ldr     \rp, [\tmp, #0]         @ omap_uart_phys
                ldr     \rv, [\tmp, #4]         @ omap_uart_virt
                cmp     \rp, #0                 @ is port configured?
                cmpne   \rv, #0
                bne     100f                    @ already configured

                /* Configure the UART offset from the phys/virt base */
#ifdef CONFIG_DEBUG_ZOOM_UART
                ldr     \rp, =ZOOM_UART_BASE
                str     \rp, [\tmp, #0]         @ omap_uart_phys
                ldr     \rp, =ZOOM_UART_VIRT
                str     \rp, [\tmp, #4]         @ omap_uart_virt
                mov     \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
                str     \rp, [\tmp, #8]         @ omap_uart_lsr
#endif
                b       10b

                .align
99:             .word   .
                .word   omap_uart_phys
                .ltorg

100:            /* Pass the UART_LSR reg address */
                ldr     \tmp, [\tmp, #8]        @ omap_uart_lsr
                add     \rp, \rp, \tmp
                add     \rv, \rv, \tmp
                .endm

                .macro  senduart,rd,rx
                orr     \rd, \rd, \rx, lsl #24  @ preserve LSR reg offset
                bic     \rx, \rx, #0xff         @ get base (THR) reg address
                strb    \rd, [\rx]              @ send lower byte of rd
                orr     \rx, \rx, \rd, lsr #24  @ restore original rx (LSR)
                bic     \rd, \rd, #(0xff << 24) @ restore original rd
                .endm

                .macro  busyuart,rd,rx
1001:           ldrb    \rd, [\rx]              @ rx contains UART_LSR address
                and     \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
                teq     \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
                bne     1001b
                .endm

                .macro  waituartcts,rd,rx
                .endm

                .macro  waituarttxrdy,rd,rx
                .endm