300 lines
6.6 KiB
C
300 lines
6.6 KiB
C
/*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/regs-uart.h>
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#include <asm/io.h>
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#include <linux/compiler.h>
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#include <serial.h>
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#include <watchdog.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* The numbering scheme differs here for PXA25x, PXA27x and PXA3xx so we can
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* easily handle enabling of clock.
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*/
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#ifdef CONFIG_CPU_MONAHANS
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#define UART_CLK_BASE CKENA_21_BTUART
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#define UART_CLK_REG CKENA
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#define BTUART_INDEX 0
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#define FFUART_INDEX 1
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#define STUART_INDEX 2
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#elif CONFIG_CPU_PXA25X
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#define UART_CLK_BASE (1 << 4) /* HWUART */
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#define UART_CLK_REG CKEN
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#define HWUART_INDEX 0
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#define STUART_INDEX 1
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#define FFUART_INDEX 2
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#define BTUART_INDEX 3
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#else /* PXA27x */
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#define UART_CLK_BASE CKEN5_STUART
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#define UART_CLK_REG CKEN
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#define STUART_INDEX 0
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#define FFUART_INDEX 1
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#define BTUART_INDEX 2
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#endif
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/*
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* Only PXA250 has HWUART, to avoid poluting the code with more macros,
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* artificially introduce this.
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*/
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#ifndef CONFIG_CPU_PXA25X
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#define HWUART_INDEX 0xff
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#endif
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static uint32_t pxa_uart_get_baud_divider(void)
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{
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if (gd->baudrate == 1200)
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return 768;
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else if (gd->baudrate == 9600)
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return 96;
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else if (gd->baudrate == 19200)
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return 48;
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else if (gd->baudrate == 38400)
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return 24;
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else if (gd->baudrate == 57600)
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return 16;
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else if (gd->baudrate == 115200)
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return 8;
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else /* Unsupported baudrate */
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return 0;
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}
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static struct pxa_uart_regs *pxa_uart_index_to_regs(uint32_t uart_index)
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{
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switch (uart_index) {
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case FFUART_INDEX: return (struct pxa_uart_regs *)FFUART_BASE;
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case BTUART_INDEX: return (struct pxa_uart_regs *)BTUART_BASE;
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case STUART_INDEX: return (struct pxa_uart_regs *)STUART_BASE;
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case HWUART_INDEX: return (struct pxa_uart_regs *)HWUART_BASE;
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default:
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return NULL;
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}
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}
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static void pxa_uart_toggle_clock(uint32_t uart_index, int enable)
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{
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uint32_t clk_reg, clk_offset, reg;
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clk_reg = UART_CLK_REG;
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clk_offset = UART_CLK_BASE << uart_index;
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reg = readl(clk_reg);
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if (enable)
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reg |= clk_offset;
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else
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reg &= ~clk_offset;
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writel(reg, clk_reg);
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}
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/*
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* Enable clock and set baud rate, parity etc.
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*/
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void pxa_setbrg_dev(uint32_t uart_index)
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{
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uint32_t divider = 0;
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struct pxa_uart_regs *uart_regs;
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divider = pxa_uart_get_baud_divider();
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if (!divider)
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hang();
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uart_regs = pxa_uart_index_to_regs(uart_index);
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if (!uart_regs)
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hang();
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pxa_uart_toggle_clock(uart_index, 1);
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/* Disable interrupts and FIFOs */
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writel(0, &uart_regs->ier);
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writel(0, &uart_regs->fcr);
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/* Set baud rate */
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writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, &uart_regs->lcr);
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writel(divider & 0xff, &uart_regs->dll);
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writel(divider >> 8, &uart_regs->dlh);
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writel(LCR_WLS0 | LCR_WLS1, &uart_regs->lcr);
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/* Enable UART */
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writel(IER_UUE, &uart_regs->ier);
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*/
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int pxa_init_dev(unsigned int uart_index)
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{
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pxa_setbrg_dev (uart_index);
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return 0;
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}
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/*
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* Output a single byte to the serial port.
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*/
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void pxa_putc_dev(unsigned int uart_index, const char c)
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{
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struct pxa_uart_regs *uart_regs;
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/* If \n, also do \r */
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if (c == '\n')
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pxa_putc_dev(uart_index, '\r');
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uart_regs = pxa_uart_index_to_regs(uart_index);
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if (!uart_regs)
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hang();
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while (!(readl(&uart_regs->lsr) & LSR_TEMT))
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WATCHDOG_RESET();
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writel(c, &uart_regs->thr);
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int pxa_tstc_dev(unsigned int uart_index)
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{
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struct pxa_uart_regs *uart_regs;
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uart_regs = pxa_uart_index_to_regs(uart_index);
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if (!uart_regs)
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return -1;
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return readl(&uart_regs->lsr) & LSR_DR;
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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int pxa_getc_dev(unsigned int uart_index)
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{
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struct pxa_uart_regs *uart_regs;
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uart_regs = pxa_uart_index_to_regs(uart_index);
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if (!uart_regs)
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return -1;
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while (!(readl(&uart_regs->lsr) & LSR_DR))
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WATCHDOG_RESET();
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return readl(&uart_regs->rbr) & 0xff;
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}
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void pxa_puts_dev(unsigned int uart_index, const char *s)
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{
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while (*s)
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pxa_putc_dev(uart_index, *s++);
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}
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#define pxa_uart(uart, UART) \
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int uart##_init(void) \
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{ \
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return pxa_init_dev(UART##_INDEX); \
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} \
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\
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void uart##_setbrg(void) \
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{ \
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return pxa_setbrg_dev(UART##_INDEX); \
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} \
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\
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void uart##_putc(const char c) \
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{ \
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return pxa_putc_dev(UART##_INDEX, c); \
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} \
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\
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void uart##_puts(const char *s) \
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{ \
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return pxa_puts_dev(UART##_INDEX, s); \
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} \
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\
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int uart##_getc(void) \
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{ \
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return pxa_getc_dev(UART##_INDEX); \
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} \
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\
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int uart##_tstc(void) \
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{ \
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return pxa_tstc_dev(UART##_INDEX); \
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} \
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#define pxa_uart_desc(uart) \
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struct serial_device serial_##uart##_device = \
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{ \
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.name = "serial_"#uart, \
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.start = uart##_init, \
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.stop = NULL, \
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.setbrg = uart##_setbrg, \
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.getc = uart##_getc, \
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.tstc = uart##_tstc, \
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.putc = uart##_putc, \
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.puts = uart##_puts, \
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};
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#define pxa_uart_multi(uart, UART) \
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pxa_uart(uart, UART) \
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pxa_uart_desc(uart)
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#if defined(CONFIG_HWUART)
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pxa_uart_multi(hwuart, HWUART)
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#endif
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#if defined(CONFIG_STUART)
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pxa_uart_multi(stuart, STUART)
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#endif
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#if defined(CONFIG_FFUART)
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pxa_uart_multi(ffuart, FFUART)
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#endif
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#if defined(CONFIG_BTUART)
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pxa_uart_multi(btuart, BTUART)
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#endif
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__weak struct serial_device *default_serial_console(void)
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{
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#if CONFIG_CONS_INDEX == 1
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return &serial_hwuart_device;
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#elif CONFIG_CONS_INDEX == 2
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return &serial_stuart_device;
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#elif CONFIG_CONS_INDEX == 3
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return &serial_ffuart_device;
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#elif CONFIG_CONS_INDEX == 4
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return &serial_btuart_device;
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#else
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#error "Bad CONFIG_CONS_INDEX."
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#endif
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}
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void pxa_serial_initialize(void)
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{
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#if defined(CONFIG_FFUART)
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serial_register(&serial_ffuart_device);
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#endif
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#if defined(CONFIG_BTUART)
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serial_register(&serial_btuart_device);
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#endif
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#if defined(CONFIG_STUART)
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serial_register(&serial_stuart_device);
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#endif
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}
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