diff options
Diffstat (limited to 'drivers/serial/mxs_auart.c')
| -rw-r--r-- | drivers/serial/mxs_auart.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/drivers/serial/mxs_auart.c b/drivers/serial/mxs_auart.c deleted file mode 100644 index fc0fa96a0e..0000000000 --- a/drivers/serial/mxs_auart.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * Freescale i.MX23/i.MX28 AUART driver - * - * Copyright (C) 2013 Andreas Wass <andreas.wass@dalelven.com> - * - * Based on the MXC serial driver: - * - * (c) 2007 Sascha Hauer <s.hauer@pengutronix.de> - * - * Further based on the Linux mxs-auart.c driver: - * - * Freescale STMP37XX/STMP38X Application UART drkiver - * Copyright 2008-2010 Freescale Semiconductor, Inc. - * - * SPDX-License-Identifier: GPL-2.0+ - */ -#include <common.h> -#include <asm/io.h> -#include <serial.h> -#include <linux/compiler.h> -#include <asm/arch/regs-base.h> -#include <asm/arch/regs-uartapp.h> -#include <asm/arch/sys_proto.h> - -DECLARE_GLOBAL_DATA_PTR; - -#ifndef CONFIG_MXS_AUART_BASE -#error "CONFIG_MXS_AUART_BASE must be set to the base UART to use" -#endif - -/* AUART clock always supplied by XTAL and always 24MHz */ -#define MXS_AUART_CLK 24000000 - -static struct mxs_uartapp_regs *get_uartapp_registers(void) -{ - return (struct mxs_uartapp_regs *)CONFIG_MXS_AUART_BASE; -} - -/** - * Sets the baud rate and settings. - * The settings are: 8 data bits, no parit and 1 stop bit. - */ -static void mxs_auart_setbrg(void) -{ - u32 div; - u32 linectrl = 0; - struct mxs_uartapp_regs *regs = get_uartapp_registers(); - - if (!gd->baudrate) - gd->baudrate = CONFIG_BAUDRATE; - - /* - * From i.MX28 datasheet: - * div is calculated by calculating UARTCLK*32/baudrate, rounded to int - * div must be between 0xEC and 0x003FFFC0 inclusive - * Lowest 6 bits of div goes in BAUD_DIVFRAC part of LINECTRL register - * Next 16 bits goes in BAUD_DIVINT part of LINECTRL register - */ - div = (MXS_AUART_CLK * 32) / gd->baudrate; - if (div < 0xEC || div > 0x003FFFC0) - return; - - linectrl |= ((div & UARTAPP_LINECTRL_EXTRACT_BAUD_DIVFRAC_MASK) << - UARTAPP_LINECTRL_BAUD_DIVFRAC_OFFSET) & - UARTAPP_LINECTRL_BAUD_DIVFRAC_MASK; - linectrl |= ((div >> UARTAPP_LINECTRL_EXTRACT_BAUD_DIVINT_OFFSET) << - UARTAPP_LINECTRL_BAUD_DIVINT_OFFSET) & - UARTAPP_LINECTRL_BAUD_DIVINT_MASK; - - /* Word length: 8 bits */ - linectrl |= UARTAPP_LINECTRL_WLEN_8BITS; - - /* Enable FIFOs. */ - linectrl |= UARTAPP_LINECTRL_FEN_MASK; - - /* Write above settings, no parity, 1 stop bit */ - writel(linectrl, ®s->hw_uartapp_linectrl); -} - -static int mxs_auart_init(void) -{ - struct mxs_uartapp_regs *regs = get_uartapp_registers(); - /* Reset everything */ - mxs_reset_block(®s->hw_uartapp_ctrl0_reg); - /* Disable interrupts */ - writel(0, ®s->hw_uartapp_intr); - /* Set baud rate and settings */ - serial_setbrg(); - /* Disable RTS and CTS, ignore LINECTRL2 register */ - writel(UARTAPP_CTRL2_RTSEN_MASK | - UARTAPP_CTRL2_CTSEN_MASK | - UARTAPP_CTRL2_USE_LCR2_MASK, - ®s->hw_uartapp_ctrl2_clr); - /* Enable receiver, transmitter and UART */ - writel(UARTAPP_CTRL2_RXE_MASK | - UARTAPP_CTRL2_TXE_MASK | - UARTAPP_CTRL2_UARTEN_MASK, - ®s->hw_uartapp_ctrl2_set); - return 0; -} - -static void mxs_auart_putc(const char c) -{ - struct mxs_uartapp_regs *regs = get_uartapp_registers(); - /* Wait in loop while the transmit FIFO is full */ - while (readl(®s->hw_uartapp_stat) & UARTAPP_STAT_TXFF_MASK) - ; - - writel(c, ®s->hw_uartapp_data); - - if (c == '\n') - mxs_auart_putc('\r'); -} - -static int mxs_auart_tstc(void) -{ - struct mxs_uartapp_regs *regs = get_uartapp_registers(); - /* Checks if receive FIFO is empty */ - return !(readl(®s->hw_uartapp_stat) & UARTAPP_STAT_RXFE_MASK); -} - -static int mxs_auart_getc(void) -{ - struct mxs_uartapp_regs *regs = get_uartapp_registers(); - /* Wait until a character is available to read */ - while (!mxs_auart_tstc()) - ; - /* Read the character from the data register */ - return readl(®s->hw_uartapp_data) & 0xFF; -} - -static struct serial_device mxs_auart_drv = { - .name = "mxs_auart_serial", - .start = mxs_auart_init, - .stop = NULL, - .setbrg = mxs_auart_setbrg, - .putc = mxs_auart_putc, - .puts = default_serial_puts, - .getc = mxs_auart_getc, - .tstc = mxs_auart_tstc, -}; - -void mxs_auart_initialize(void) -{ - serial_register(&mxs_auart_drv); -} - -__weak struct serial_device *default_serial_console(void) -{ - return &mxs_auart_drv; -} |