--- /dev/null
+/*
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <serial.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/regs-uart.h>
+#include <asm/io.h>
+#include <linux/compiler.h>
+
+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
+
+static 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;
+}
+
+static 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;
+ }
+}
+
+static 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
+
+__weak struct serial_device *default_serial_console(void)
+{
+#if CONFIG_CONS_INDEX == 1
+ return &serial_hwuart_device;
+#elif CONFIG_CONS_INDEX == 2
+ return &serial_stuart_device;
+#elif CONFIG_CONS_INDEX == 3
+ return &serial_ffuart_device;
+#elif CONFIG_CONS_INDEX == 4
+ return &serial_btuart_device;
+#else
+#error "Bad CONFIG_CONS_INDEX."
+#endif
+}
+
+void pxa_serial_initialize(void)
+{
+#if defined(CONFIG_FFUART)
+ serial_register(&serial_ffuart_device);
+#endif
+#if defined(CONFIG_BTUART)
+ serial_register(&serial_btuart_device);
+#endif
+#if defined(CONFIG_STUART)
+ serial_register(&serial_stuart_device);
+#endif
+}
Code Review / kvmfornfv.git / blobdiff