drivers: ti: uart: add a aarch32 variant
Rockchip re-uses the ti uart console driver and for aarch32 needs a
specific variant, so add it.
There are also aarch32 ti socs, so it may be useful for them as well
at some point.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Change-Id: I31ede7cc7b10347b3691cff051db2b985fd59e17
diff --git a/drivers/ti/uart/aarch32/16550_console.S b/drivers/ti/uart/aarch32/16550_console.S
new file mode 100644
index 0000000..6921884
--- /dev/null
+++ b/drivers/ti/uart/aarch32/16550_console.S
@@ -0,0 +1,267 @@
+/*
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <assert_macros.S>
+#include <console_macros.S>
+#include <drivers/ti/uart/uart_16550.h>
+
+ /*
+ * "core" functions are low-level implementations that don't require
+ * writable memory and are thus safe to call in BL1 crash context.
+ */
+ .globl console_16550_core_init
+ .globl console_16550_core_putc
+ .globl console_16550_core_getc
+ .globl console_16550_core_flush
+
+ .globl console_16550_putc
+ .globl console_16550_getc
+ .globl console_16550_flush
+
+ /* -----------------------------------------------
+ * int console_16550_core_init(uintptr_t base_addr,
+ * unsigned int uart_clk, unsigned int baud_rate)
+ * Function to initialize the console without a
+ * C Runtime to print debug information. This
+ * function will be accessed by console_init and
+ * crash reporting.
+ * In: r0 - console base address
+ * r1 - Uart clock in Hz
+ * r2 - Baud rate
+ * Out: return 1 on success, 0 on error
+ * Clobber list : r1, r2, r3
+ * -----------------------------------------------
+ */
+func console_16550_core_init
+ /* Check the input base address */
+ cmp r0, #0
+ beq init_fail
+ /* Check baud rate and uart clock for sanity */
+ cmp r1, #0
+ beq init_fail
+ cmp r2, #0
+ beq init_fail
+
+ /* Program the baudrate */
+ /* Divisor = Uart clock / (16 * baudrate) */
+ lsl r2, r2, #4
+ udiv r2, r1, r2
+ and r1, r2, #0xff /* w1 = DLL */
+ lsr r2, r2, #8
+ and r2, r2, #0xff /* w2 = DLLM */
+ ldr r3, [r0, #UARTLCR]
+ orr r3, r3, #UARTLCR_DLAB
+ str r3, [r0, #UARTLCR] /* enable DLL, DLLM programming */
+ str r1, [r0, #UARTDLL] /* program DLL */
+ str r2, [r0, #UARTDLLM] /* program DLLM */
+ mov r2, #~UARTLCR_DLAB
+ and r3, r3, r2
+ str r3, [r0, #UARTLCR] /* disable DLL, DLLM programming */
+
+ /* 8n1 */
+ mov r3, #3
+ str r3, [r0, #UARTLCR]
+ /* no interrupt */
+ mov r3, #0
+ str r3, [r0, #UARTIER]
+#ifdef TI_16550_MDR_QUIRK
+ /* UART must be enabled on some platforms via the MDR register */
+ str r3, [r0, #UARTMDR1]
+#endif /* TI_16550_MDR_QUIRK */
+ /* enable fifo, DMA */
+ mov r3, #(UARTFCR_FIFOEN | UARTFCR_DMAEN)
+ str r3, [r0, #UARTFCR]
+ /* DTR + RTS */
+ mov r3, #3
+ str r3, [r0, #UARTMCR]
+ mov r0, #1
+ bx lr
+init_fail:
+ mov r0, #0
+ bx lr
+endfunc console_16550_core_init
+
+ .globl console_16550_register
+
+ /* -------------------------------------------------------
+ * int console_stm32_register(uintptr_t baseaddr,
+ * uint32_t clock, uint32_t baud,
+ * struct console_stm32 *console);
+ * Function to initialize and register a new STM32
+ * console. Storage passed in for the console struct
+ * *must* be persistent (i.e. not from the stack).
+ * In: r0 - UART register base address
+ * r1 - UART clock in Hz
+ * r2 - Baud rate
+ * r3 - pointer to empty console_stm32 struct
+ * Out: return 1 on success, 0 on error
+ * Clobber list : r0, r1, r2
+ * -------------------------------------------------------
+ */
+func console_16550_register
+ push {r4, lr}
+ mov r4, r3
+ cmp r4, #0
+ beq register_fail
+ str r0, [r4, #CONSOLE_T_16550_BASE]
+
+ bl console_16550_core_init
+ cmp r0, #0
+ beq register_fail
+
+ mov r0, r4
+ pop {r4, lr}
+ finish_console_register 16550 putc=1, getc=1, flush=1
+
+register_fail:
+ pop {r4, pc}
+endfunc console_16550_register
+
+ /* --------------------------------------------------------
+ * int console_16550_core_putc(int c, uintptr_t base_addr)
+ * Function to output a character over the console. It
+ * returns the character printed on success or -1 on error.
+ * In : r0 - character to be printed
+ * r1 - console base address
+ * Out : return -1 on error else return character.
+ * Clobber list : r2
+ * --------------------------------------------------------
+ */
+func console_16550_core_putc
+#if ENABLE_ASSERTIONS
+ cmp r1, #0
+ ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+
+ /* Prepend '\r' to '\n' */
+ cmp r0, #0xA
+ bne 2f
+ /* Check if the transmit FIFO is full */
+1: ldr r2, [r1, #UARTLSR]
+ and r2, r2, #(UARTLSR_TEMT | UARTLSR_THRE)
+ cmp r2, #(UARTLSR_TEMT | UARTLSR_THRE)
+ bne 1b
+ mov r2, #0xD /* '\r' */
+ str r2, [r1, #UARTTX]
+
+ /* Check if the transmit FIFO is full */
+2: ldr r2, [r1, #UARTLSR]
+ and r2, r2, #(UARTLSR_TEMT | UARTLSR_THRE)
+ cmp r2, #(UARTLSR_TEMT | UARTLSR_THRE)
+ bne 2b
+ str r0, [r1, #UARTTX]
+ bx lr
+endfunc console_16550_core_putc
+
+ /* --------------------------------------------------------
+ * int console_16550_putc(int c, console_16550_t *console)
+ * Function to output a character over the console. It
+ * returns the character printed on success or -1 on error.
+ * In : r0 - character to be printed
+ * r1 - pointer to console_t structure
+ * Out : return -1 on error else return character.
+ * Clobber list : r2
+ * --------------------------------------------------------
+ */
+func console_16550_putc
+#if ENABLE_ASSERTIONS
+ cmp r1, #0
+ ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+ ldr r1, [r1, #CONSOLE_T_16550_BASE]
+ b console_16550_core_putc
+endfunc console_16550_putc
+
+ /* ---------------------------------------------
+ * int console_16550_core_getc(uintptr_t base_addr)
+ * Function to get a character from the console.
+ * It returns the character grabbed on success
+ * or -1 on if no character is available.
+ * In : r0 - console base address
+ * Clobber list : r0, r1
+ * ---------------------------------------------
+ */
+func console_16550_core_getc
+#if ENABLE_ASSERTIONS
+ cmp r0, #0
+ ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+
+ /* Check if the receive FIFO is empty */
+1: ldr r1, [r0, #UARTLSR]
+ tst r1, #UARTLSR_RDR_BIT
+ beq no_char
+ ldr r1, [r0, #UARTRX]
+ mov r0, r1
+ bx lr
+no_char:
+ mov r0, #ERROR_NO_PENDING_CHAR
+ bx lr
+endfunc console_16550_core_getc
+
+ /* ---------------------------------------------
+ * int console_16550_getc(console_16550_t *console)
+ * Function to get a character from the console.
+ * It returns the character grabbed on success
+ * or -1 on if no character is available.
+ * In : r0 - pointer to console_t stucture
+ * Out : r0 - character if available, else -1
+ * Clobber list : r0, r1
+ * ---------------------------------------------
+ */
+func console_16550_getc
+#if ENABLE_ASSERTIONS
+ cmp r0, #0
+ ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+ ldr r0, [r0, #CONSOLE_T_16550_BASE]
+ b console_16550_core_getc
+endfunc console_16550_getc
+
+ /* ---------------------------------------------
+ * int console_16550_core_flush(uintptr_t base_addr)
+ * Function to force a write of all buffered
+ * data that hasn't been output.
+ * In : r0 - console base address
+ * Out : return -1 on error else return 0.
+ * Clobber list : r0, r1
+ * ---------------------------------------------
+ */
+func console_16550_core_flush
+#if ENABLE_ASSERTIONS
+ cmp r0, #0
+ ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+
+ /* Loop until the transmit FIFO is empty */
+1: ldr r1, [r0, #UARTLSR]
+ and r1, r1, #(UARTLSR_TEMT | UARTLSR_THRE)
+ cmp r1, #(UARTLSR_TEMT | UARTLSR_THRE)
+ bne 1b
+
+ mov r0, #0
+ bx lr
+endfunc console_16550_core_flush
+
+ /* ---------------------------------------------
+ * int console_16550_flush(console_pl011_t *console)
+ * Function to force a write of all buffered
+ * data that hasn't been output.
+ * In : r0 - pointer to console_t structure
+ * Out : return -1 on error else return 0.
+ * Clobber list : r0, r1
+ * ---------------------------------------------
+ */
+func console_16550_flush
+#if ENABLE_ASSERTIONS
+ cmp r0, #0
+ ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+ ldr r0, [r0, #CONSOLE_T_16550_BASE]
+ b console_16550_core_flush
+endfunc console_16550_flush