arch/arm/mach-uniphier/debug-uart/debug-uart-ld20.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
   4  */
   5
   6 #include <config.h>
   7 #include <linux/kernel.h>
   8 #include <linux/io.h>
   9
  10 #include "../sc64-regs.h"
  11 #include "../sg-regs.h"
  12 #include "debug-uart.h"
  13
  14 #define UNIPHIER_LD20_UART_CLK          58820000
  15
  16 unsigned int uniphier_ld20_debug_uart_init(void)
  17 {
  18         u32 tmp;
  19
  20         sg_set_iectrl(54);              /* TXD0 */
  21         sg_set_iectrl(58);              /* TXD1 */
  22         sg_set_iectrl(90);              /* TXD2 */
  23         sg_set_iectrl(94);              /* TXD3 */
  24         sg_set_pinsel(54, 0, 8, 4);     /* TXD0 -> TXD0 */
  25         sg_set_pinsel(58, 1, 8, 4);     /* SPITXD1 -> TXD1 */
  26         sg_set_pinsel(90, 1, 8, 4);     /* PC0WE -> TXD2 */
  27         sg_set_pinsel(94, 1, 8, 4);     /* PCD00 -> TXD3 */
  28
  29         tmp = readl(SC_CLKCTRL4);
  30         tmp |= SC_CLKCTRL4_PERI;
  31         writel(tmp, SC_CLKCTRL4);
  32
  33         return DIV_ROUND_CLOSEST(UNIPHIER_LD20_UART_CLK, 16 * CONFIG_BAUDRATE);
  34 }