Support for NXP's imx SoC debug uart

Add NXP's imx SoC debug uart driver.

Signed-off-by: Anson Huang <[email protected]>

diff --git a/plat/imx/common/include/imx8_lpuart.h b/plat/imx/common/include/imx8_lpuart.h
new file mode 100644 (file)
index 0000000..4ff91bd
--- /dev/null
+++ b/plat/imx/common/include/imx8_lpuart.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __IMX_LPUART_H__
+#define __IMX_LPUART_H__
+
+#include <console.h>
+
+#define VERID  0x0
+#define PARAM  0x4
+#define GLOBAL 0x8
+#define PINCFG 0xC
+#define BAUD   0x10
+#define STAT   0x14
+#define CTRL   0x18
+#define DATA   0x1C
+#define MATCH  0x20
+#define MODIR  0x24
+#define FIFO   0x28
+#define WATER  0x2c
+
+#define US1_TDRE       (1 << 23)
+#define US1_RDRF       (1 << 21)
+
+#define CTRL_TE                (1 << 19)
+#define CTRL_RE                (1 << 18)
+
+#define FIFO_TXFE      0x80
+#define FIFO_RXFE      0x40
+
+#define WATER_TXWATER_OFF      1
+#define WATER_RXWATER_OFF      16
+
+#define LPUART_CTRL_PT_MASK    0x1
+#define LPUART_CTRL_PE_MASK    0x2
+#define LPUART_CTRL_M_MASK     0x10
+
+#define LPUART_BAUD_OSR_MASK                     (0x1F000000U)
+#define LPUART_BAUD_OSR_SHIFT                    (24U)
+#define LPUART_BAUD_OSR(x)                       (((uint32_t)(((uint32_t)(x)) << LPUART_BAUD_OSR_SHIFT)) & LPUART_BAUD_OSR_MASK)
+
+#define LPUART_BAUD_SBR_MASK                     (0x1FFFU)
+#define LPUART_BAUD_SBR_SHIFT                    (0U)
+#define LPUART_BAUD_SBR(x)                       (((uint32_t)(((uint32_t)(x)) << LPUART_BAUD_SBR_SHIFT)) & LPUART_BAUD_SBR_MASK)
+
+#define LPUART_BAUD_SBNS_MASK                    (0x2000U)
+#define LPUART_BAUD_BOTHEDGE_MASK                (0x20000U)
+#define LPUART_BAUD_M10_MASK                     (0x20000000U)
+
+#ifndef __ASSEMBLY__
+
+#include <types.h>
+
+typedef struct {
+       console_t console;
+       uintptr_t base;
+} console_lpuart_t;
+
+int console_lpuart_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
+                          console_lpuart_t *console);
+#endif /*__ASSEMBLY__*/
+
+#endif  /* __IMX_LPUART_H__*/

diff --git a/plat/imx/common/lpuart_console.S b/plat/imx/common/lpuart_console.S
new file mode 100644 (file)
index 0000000..ad71b89
--- /dev/null
+++ b/plat/imx/common/lpuart_console.S
@@ -0,0 +1,71 @@
+/*
+ * 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 <console_macros.S>
+#include <assert_macros.S>
+#include "imx8_lpuart.h"
+
+       .globl  console_lpuart_register
+       .globl  console_lpuart_init
+       .globl  console_lpuart_putc
+       .globl  console_lpuart_getc
+
+func console_lpuart_register
+       mov     x7, x30
+       mov     x6, x3
+       cbz     x6, register_fail
+       str     x0, [x6, #CONSOLE_T_DRVDATA]
+
+       bl      console_lpuart_init
+       cbz     x0, register_fail
+
+       mov     x0, x6
+       mov     x30, x7
+       finish_console_register lpuart
+
+register_fail:
+       ret     x7
+endfunc console_lpuart_register
+
+func console_lpuart_init
+       mov     w0, #1
+       ret
+endfunc console_lpuart_init
+
+func console_lpuart_putc
+       ldr     x1, [x1, #CONSOLE_T_DRVDATA]
+       cbz     x1, putc_error
+       /* Prepare '\r' to '\n' */
+       cmp     w0, #0xA
+       b.ne    2f
+1:
+       /* Check if the transmit FIFO is full */
+       ldr     w2, [x1, #STAT]
+       tbz     w2, #23, 1b
+       mov     w2, #0xD
+       str     w2, [x1, #DATA]
+2:
+       /* Check if the transmit FIFO is full */
+       ldr     w2, [x1, #STAT]
+       tbz     w2, #23, 2b
+       str     w0, [x1, #DATA]
+       ret
+putc_error:
+       mov     w0, #-1
+       ret
+endfunc console_lpuart_putc
+
+func console_lpuart_getc
+       ldr     x0, [x0, #CONSOLE_T_DRVDATA]
+       cbz     x0, getc_error
+       /* Check if the receive FIFO state */
+       ret
+getc_error:
+       mov     w0, #-1
+       ret
+endfunc console_lpuart_getc