/* * Copyright (C) 2011 Marek Vasut * * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Alex Zuepke * * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; /* * The numbering scheme differs here for PXA25x, PXA27x and PXA3xx so we can * easily handle enabling of clock. */ #ifdef CONFIG_CPU_MONAHANS #define UART_CLK_BASE CKENA_21_BTUART #define UART_CLK_REG CKENA #define BTUART_INDEX 0 #define FFUART_INDEX 1 #define STUART_INDEX 2 #elif CONFIG_CPU_PXA25X #define UART_CLK_BASE (1 << 4) /* HWUART */ #define UART_CLK_REG CKEN #define HWUART_INDEX 0 #define STUART_INDEX 1 #define FFUART_INDEX 2 #define BTUART_INDEX 3 #else /* PXA27x */ #define UART_CLK_BASE CKEN5_STUART #define UART_CLK_REG CKEN #define STUART_INDEX 0 #define FFUART_INDEX 1 #define BTUART_INDEX 2 #endif /* * Only PXA250 has HWUART, to avoid poluting the code with more macros, * artificially introduce this. */ #ifndef CONFIG_CPU_PXA25X #define HWUART_INDEX 0xff #endif #ifndef CONFIG_SERIAL_MULTI #if defined(CONFIG_FFUART) #define UART_INDEX FFUART_INDEX #elif defined(CONFIG_BTUART) #define UART_INDEX BTUART_INDEX #elif defined(CONFIG_STUART) #define UART_INDEX STUART_INDEX #elif defined(CONFIG_HWUART) #define UART_INDEX HWUART_INDEX #else #error "Please select CONFIG_(FF|BT|ST|HW)UART in board config file." #endif #endif uint32_t pxa_uart_get_baud_divider(void) { if (gd->baudrate == 1200) return 768; else if (gd->baudrate == 9600) return 96; else if (gd->baudrate == 19200) return 48; else if (gd->baudrate == 38400) return 24; else if (gd->baudrate == 57600) return 16; else if (gd->baudrate == 115200) return 8; else /* Unsupported baudrate */ return 0; } struct pxa_uart_regs *pxa_uart_index_to_regs(uint32_t uart_index) { switch (uart_index) { case FFUART_INDEX: return (struct pxa_uart_regs *)FFUART_BASE; case BTUART_INDEX: return (struct pxa_uart_regs *)BTUART_BASE; case STUART_INDEX: return (struct pxa_uart_regs *)STUART_BASE; case HWUART_INDEX: return (struct pxa_uart_regs *)HWUART_BASE; default: return NULL; } } void pxa_uart_toggle_clock(uint32_t uart_index, int enable) { uint32_t clk_reg, clk_offset, reg; clk_reg = UART_CLK_REG; clk_offset = UART_CLK_BASE << uart_index; reg = readl(clk_reg); if (enable) reg |= clk_offset; else reg &= ~clk_offset; writel(reg, clk_reg); } /* * Enable clock and set baud rate, parity etc. */ void pxa_setbrg_dev(uint32_t uart_index) { uint32_t divider = 0; struct pxa_uart_regs *uart_regs; divider = pxa_uart_get_baud_divider(); if (!divider) hang(); uart_regs = pxa_uart_index_to_regs(uart_index); if (!uart_regs) hang(); pxa_uart_toggle_clock(uart_index, 1); /* Disable interrupts and FIFOs */ writel(0, &uart_regs->ier); writel(0, &uart_regs->fcr); /* Set baud rate */ writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, &uart_regs->lcr); writel(divider & 0xff, &uart_regs->dll); writel(divider >> 8, &uart_regs->dlh); writel(LCR_WLS0 | LCR_WLS1, &uart_regs->lcr); /* Enable UART */ writel(IER_UUE, &uart_regs->ier); } /* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. */ int pxa_init_dev(unsigned int uart_index) { pxa_setbrg_dev (uart_index); return 0; } /* * Output a single byte to the serial port. */ void pxa_putc_dev(unsigned int uart_index, const char c) { struct pxa_uart_regs *uart_regs; uart_regs = pxa_uart_index_to_regs(uart_index); if (!uart_regs) hang(); while (!(readl(&uart_regs->lsr) & LSR_TEMT)) WATCHDOG_RESET(); writel(c, &uart_regs->thr); /* If \n, also do \r */ if (c == '\n') pxa_putc_dev (uart_index,'\r'); } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is succesfull, the character read is * written into its argument c. */ int pxa_tstc_dev(unsigned int uart_index) { struct pxa_uart_regs *uart_regs; uart_regs = pxa_uart_index_to_regs(uart_index); if (!uart_regs) return -1; return readl(&uart_regs->lsr) & LSR_DR; } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is succesfull, the character read is * written into its argument c. */ int pxa_getc_dev(unsigned int uart_index) { struct pxa_uart_regs *uart_regs; uart_regs = pxa_uart_index_to_regs(uart_index); if (!uart_regs) return -1; while (!(readl(&uart_regs->lsr) & LSR_DR)) WATCHDOG_RESET(); return readl(&uart_regs->rbr) & 0xff; } void pxa_puts_dev(unsigned int uart_index, const char *s) { while (*s) pxa_putc_dev(uart_index, *s++); } #define pxa_uart(uart, UART) \ int uart##_init(void) \ { \ return pxa_init_dev(UART##_INDEX); \ } \ \ void uart##_setbrg(void) \ { \ return pxa_setbrg_dev(UART##_INDEX); \ } \ \ void uart##_putc(const char c) \ { \ return pxa_putc_dev(UART##_INDEX, c); \ } \ \ void uart##_puts(const char *s) \ { \ return pxa_puts_dev(UART##_INDEX, s); \ } \ \ int uart##_getc(void) \ { \ return pxa_getc_dev(UART##_INDEX); \ } \ \ int uart##_tstc(void) \ { \ return pxa_tstc_dev(UART##_INDEX); \ } \ #define pxa_uart_desc(uart) \ struct serial_device serial_##uart##_device = \ { \ .name = "serial_"#uart, \ .start = uart##_init, \ .stop = NULL, \ .setbrg = uart##_setbrg, \ .getc = uart##_getc, \ .tstc = uart##_tstc, \ .putc = uart##_putc, \ .puts = uart##_puts, \ }; #define pxa_uart_multi(uart, UART) \ pxa_uart(uart, UART) \ pxa_uart_desc(uart) #if defined(CONFIG_HWUART) pxa_uart_multi(hwuart, HWUART) #endif #if defined(CONFIG_STUART) pxa_uart_multi(stuart, STUART) #endif #if defined(CONFIG_FFUART) pxa_uart_multi(ffuart, FFUART) #endif #if defined(CONFIG_BTUART) pxa_uart_multi(btuart, BTUART) #endif #ifndef CONFIG_SERIAL_MULTI pxa_uart(serial, UART) #endif