Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 264 insertions, 0 deletions

diff --git a/drivers/arm/pl011/aarch32/pl011_console.S b/drivers/arm/pl011/aarch32/pl011_console.S
new file mode 100644
index 0000000..9caeb0c
--- /dev/null
+++ b/drivers/arm/pl011/aarch32/pl011_console.S
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 2016-2020, 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/arm/pl011.h>
+
+	/*
+	 * "core" functions are low-level implementations that don't require
+	 * writeable memory and are thus safe to call in BL1 crash context.
+	 */
+	.globl	console_pl011_core_init
+	.globl	console_pl011_core_putc
+	.globl	console_pl011_core_getc
+	.globl	console_pl011_core_flush
+
+	.globl	console_pl011_putc
+	.globl	console_pl011_getc
+	.globl	console_pl011_flush
+
+
+	/* -----------------------------------------------
+	 * int console_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 else 0 on error
+	 * Clobber list : r1, r2, r3
+	 * -----------------------------------------------
+	 */
+func console_pl011_core_init
+	/* Check the input base address */
+	cmp	r0, #0
+	beq	core_init_fail
+#if !PL011_GENERIC_UART
+	/* Check baud rate and uart clock for sanity */
+	cmp	r1, #0
+	beq	core_init_fail
+	cmp	r2, #0
+	beq	core_init_fail
+	/* Disable the UART before initialization */
+	ldr	r3, [r0, #UARTCR]
+	bic	r3, r3, #PL011_UARTCR_UARTEN
+	str	r3, [r0, #UARTCR]
+	/* Program the baudrate */
+	/* Divisor =  (Uart clock * 4) / baudrate */
+	lsl	r1, r1, #2
+#if (ARM_ARCH_MAJOR == 7) && !defined(ARMV7_SUPPORTS_VIRTUALIZATION)
+	push	{r0,r3}
+	softudiv	r0,r1,r2,r3
+	mov	r2, r0
+	pop	{r0,r3}
+#else
+	udiv	r2, r1, r2
+#endif
+	/* IBRD = Divisor >> 6 */
+	lsr	r1, r2, #6
+	/* Write the IBRD */
+	str	r1, [r0, #UARTIBRD]
+	/* FBRD = Divisor & 0x3F */
+	and	r1, r2, #0x3f
+	/* Write the FBRD */
+	str	r1, [r0, #UARTFBRD]
+	mov	r1, #PL011_LINE_CONTROL
+	str	r1, [r0, #UARTLCR_H]
+	/* Clear any pending errors */
+	mov	r1, #0
+	str	r1, [r0, #UARTECR]
+	/* Enable tx, rx, and uart overall */
+	ldr	r1, =(PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN)
+	str	r1, [r0, #UARTCR]
+#endif
+	mov	r0, #1
+	bx	lr
+core_init_fail:
+	mov	r0, #0
+	bx	lr
+endfunc console_pl011_core_init
+
+	.globl console_pl011_register
+
+	/* -------------------------------------------------------
+	 * int console_pl011_register(uintptr_t baseaddr,
+	 *     uint32_t clock, uint32_t baud,
+	 *     console_t *console);
+	 * Function to initialize and register a new PL011
+	 * 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_t struct
+	 * Out: return 1 on success, 0 on error
+	 * Clobber list : r0, r1, r2
+	 * -------------------------------------------------------
+	 */
+func console_pl011_register
+	push	{r4, lr}
+	mov	r4, r3
+	cmp	r4, #0
+	beq	register_fail
+	str	r0, [r4, #CONSOLE_T_BASE]
+
+	bl console_pl011_core_init
+	cmp	r0, #0
+	beq	register_fail
+
+	mov	r0, r4
+	pop	{r4, lr}
+	finish_console_register pl011 putc=1, getc=1, flush=1
+
+register_fail:
+	pop	{r4, pc}
+endfunc console_pl011_register
+
+	/* --------------------------------------------------------
+	 * int console_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_pl011_core_putc
+	/* Check the input parameter */
+	cmp	r1, #0
+	beq	putc_error
+	/* Prepend '\r' to '\n' */
+	cmp	r0, #0xA
+	bne	2f
+1:
+	/* Check if the transmit FIFO is full */
+	ldr	r2, [r1, #UARTFR]
+	tst	r2, #PL011_UARTFR_TXFF
+	bne	1b
+	mov	r2, #0xD
+	str	r2, [r1, #UARTDR]
+2:
+	/* Check if the transmit FIFO is full */
+	ldr	r2, [r1, #UARTFR]
+	tst	r2, #PL011_UARTFR_TXFF
+	bne	2b
+	str	r0, [r1, #UARTDR]
+	bx	lr
+putc_error:
+	mov	r0, #-1
+	bx	lr
+endfunc console_pl011_core_putc
+
+	/* --------------------------------------------------------
+	 * int console_pl011_putc(int c, console_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_pl011_putc
+#if ENABLE_ASSERTIONS
+	cmp	r1, #0
+	ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+	ldr	r1, [r1, #CONSOLE_T_BASE]
+	b	console_pl011_core_putc
+endfunc console_pl011_putc
+
+	/* ---------------------------------------------
+	 * int console_core_getc(uintptr_t base_addr)
+	 * Function to get a character from the console.
+	 * It returns the character grabbed on success
+	 * or -1 on error.
+	 * In : r0 - console base address
+	 * Clobber list : r0, r1
+	 * ---------------------------------------------
+	 */
+func console_pl011_core_getc
+	cmp	r0, #0
+	beq	getc_error
+1:
+	/* Check if the receive FIFO is empty */
+	ldr	r1, [r0, #UARTFR]
+	tst	r1, #PL011_UARTFR_RXFE
+	bne	1b
+	ldr	r1, [r0, #UARTDR]
+	mov	r0, r1
+	bx	lr
+getc_error:
+	mov	r0, #-1
+	bx	lr
+endfunc console_pl011_core_getc
+
+	/* ------------------------------------------------
+	 * int console_pl011_getc(console_t *console)
+	 * Function to get a character from the console.
+	 * It returns the character grabbed on success
+	 * or -1 if no character is available.
+	 * In : r0 - pointer to console_t structure
+	 * Out: r0 - character if available, else -1
+	 * Clobber list: r0, r1
+	 * ------------------------------------------------
+	 */
+func console_pl011_getc
+#if ENABLE_ASSERTIONS
+	cmp	r0, #0
+	ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+	ldr	r0, [r0, #CONSOLE_T_BASE]
+	b	console_pl011_core_getc
+endfunc console_pl011_getc
+
+	/* ---------------------------------------------
+	 * void console_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 : void
+	 * Clobber list : r0, r1
+	 * ---------------------------------------------
+	 */
+func console_pl011_core_flush
+#if ENABLE_ASSERTIONS
+	cmp	r0, #0
+	ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+
+1:
+	/* Loop while the transmit FIFO is busy */
+	ldr	r1, [r0, #UARTFR]
+	tst	r1, #PL011_UARTFR_BUSY
+	bne	1b
+
+	bx	lr
+endfunc console_pl011_core_flush
+
+	/* ---------------------------------------------
+	 * void console_pl011_flush(console_t *console)
+	 * Function to force a write of all buffered
+	 * data that hasn't been output.
+	 * In : r0 - pointer to console_t structure
+	 * Out : void
+	 * Clobber list: r0, r1
+	 * ---------------------------------------------
+	 */
+func console_pl011_flush
+#if ENABLE_ASSERTIONS
+	cmp	r0, #0
+	ASM_ASSERT(ne)
+#endif /* ENABLE_ASSERTIONS */
+	ldr	r0, [r0, #CONSOLE_T_BASE]
+	b	console_pl011_core_flush
+endfunc console_pl011_flush