+// SPDX-License-Identifier: GPL-2.0+
/*
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ *
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
*
* 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
- *
+ * Modified to add driver model (DM) support
+ * (C) Copyright 2016 Marcel Ziswiler <marcel.ziswiler@toradex.com>
*/
#include <common.h>
-#include <watchdog.h>
-#include <serial.h>
+#include <hang.h>
#include <asm/arch/pxa-regs.h>
+#include <asm/arch/regs-uart.h>
#include <asm/io.h>
+#include <dm.h>
+#include <dm/platform_data/serial_pxa.h>
+#include <linux/compiler.h>
+#include <serial.h>
+#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
-#define FFUART_INDEX 0
-#define BTUART_INDEX 1
-#define STUART_INDEX 2
-
-#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
-#else
-#error "Bad: you didn't configure serial ..."
-#endif
-#endif
-
-void pxa_setbrg_dev (unsigned int uart_index)
+static uint32_t pxa_uart_get_baud_divider(int baudrate)
{
- unsigned int quot = 0;
-
- if (gd->baudrate == 1200)
- quot = 768;
- else if (gd->baudrate == 9600)
- quot = 96;
- else if (gd->baudrate == 19200)
- quot = 48;
- else if (gd->baudrate == 38400)
- quot = 24;
- else if (gd->baudrate == 57600)
- quot = 16;
- else if (gd->baudrate == 115200)
- quot = 8;
- else
- hang ();
-
- switch (uart_index) {
- case FFUART_INDEX:
-#ifdef CONFIG_CPU_MONAHANS
- writel(readl(CKENA) | CKENA_22_FFUART, CKENA);
-#else
- writel(readl(CKEN) | CKEN6_FFUART, CKEN);
-#endif /* CONFIG_CPU_MONAHANS */
+ return 921600 / baudrate;
+}
- writel(0, FFIER); /* Disable for now */
- writel(0, FFFCR); /* No fifos enabled */
+static void pxa_uart_toggle_clock(uint32_t uart_index, int enable)
+{
+ uint32_t clk_reg, clk_offset, reg;
- /* set baud rate */
- writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, FFLCR);
- writel(quot & 0xff, FFDLL);
- writel(quot >> 8, FFDLH);
- writel(LCR_WLS0 | LCR_WLS1, FFLCR);
+ clk_reg = UART_CLK_REG;
+ clk_offset = UART_CLK_BASE << uart_index;
- writel(IER_UUE, FFIER); /* Enable FFUART */
- break;
+ reg = readl(clk_reg);
- case BTUART_INDEX:
-#ifdef CONFIG_CPU_MONAHANS
- writel(readl(CKENA) | CKENA_21_BTUART, CKENA);
-#else
- writel(readl(CKEN) | CKEN7_BTUART, CKEN);
-#endif /* CONFIG_CPU_MONAHANS */
+ if (enable)
+ reg |= clk_offset;
+ else
+ reg &= ~clk_offset;
- writel(0, BTIER);
- writel(0, BTFCR);
+ writel(reg, clk_reg);
+}
- /* set baud rate */
- writel(LCR_DLAB, BTLCR);
- writel(quot & 0xff, BTDLL);
- writel(quot >> 8, BTDLH);
- writel(LCR_WLS0 | LCR_WLS1, BTLCR);
+/*
+ * Enable clock and set baud rate, parity etc.
+ */
+void pxa_setbrg_common(struct pxa_uart_regs *uart_regs, int port, int baudrate)
+{
+ uint32_t divider = pxa_uart_get_baud_divider(baudrate);
+ if (!divider)
+ hang();
- writel(IER_UUE, BTIER); /* Enable BFUART */
- break;
+ pxa_uart_toggle_clock(port, 1);
- case STUART_INDEX:
-#ifdef CONFIG_CPU_MONAHANS
- writel(readl(CKENA) | CKENA_23_STUART, CKENA);
-#else
- writel(readl(CKEN) | CKEN5_STUART, CKEN);
-#endif /* CONFIG_CPU_MONAHANS */
+ /* Disable interrupts and FIFOs */
+ writel(0, &uart_regs->ier);
+ writel(0, &uart_regs->fcr);
- writel(0, STIER);
- writel(0, STFCR);
+ /* 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);
- /* set baud rate */
- writel(LCR_DLAB, STLCR);
- writel(quot & 0xff, STDLL);
- writel(quot >> 8, STDLH);
- writel(LCR_WLS0 | LCR_WLS1, STLCR);
-
- writel(IER_UUE, STIER); /* Enable STUART */
- break;
+ /* Enable UART */
+ writel(IER_UUE, &uart_regs->ier);
+}
- default:
- hang();
+#ifndef CONFIG_DM_SERIAL
+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;
}
}
+/*
+ * Enable clock and set baud rate, parity etc.
+ */
+void pxa_setbrg_dev(uint32_t uart_index)
+{
+ struct pxa_uart_regs *uart_regs = pxa_uart_index_to_regs(uart_index);
+ if (!uart_regs)
+ panic("Failed getting UART registers\n");
+
+ pxa_setbrg_common(uart_regs, uart_index, gd->baudrate);
+}
/*
* 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)
+int pxa_init_dev(unsigned int uart_index)
{
- pxa_setbrg_dev (uart_index);
-
- return (0);
+ 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)
+void pxa_putc_dev(unsigned int uart_index, const char c)
{
- switch (uart_index) {
- case FFUART_INDEX:
- /* wait for room in the tx FIFO on FFUART */
- while ((readl(FFLSR) & LSR_TEMT) == 0)
- WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
- writel(c, FFTHR);
- break;
-
- case BTUART_INDEX:
- while ((readl(BTLSR) & LSR_TEMT) == 0)
- WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
- writel(c, BTTHR);
- break;
-
- case STUART_INDEX:
- while ((readl(STLSR) & LSR_TEMT) == 0)
- WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
- writel(c, STTHR);
- break;
- }
+ struct pxa_uart_regs *uart_regs;
/* If \n, also do \r */
if (c == '\n')
- pxa_putc_dev (uart_index,'\r');
+ pxa_putc_dev(uart_index, '\r');
+
+ 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);
}
/*
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
-int pxa_tstc_dev (unsigned int uart_index)
+int pxa_tstc_dev(unsigned int uart_index)
{
- switch (uart_index) {
- case FFUART_INDEX:
- return readl(FFLSR) & LSR_DR;
- case BTUART_INDEX:
- return readl(BTLSR) & LSR_DR;
- case STUART_INDEX:
- return readl(STLSR) & LSR_DR;
- }
- return -1;
+ 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;
}
/*
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
-int pxa_getc_dev (unsigned int uart_index)
-{
- switch (uart_index) {
- case FFUART_INDEX:
- while (!(readl(FFLSR) & LSR_DR))
- /* Reset HW Watchdog, if needed */
- WATCHDOG_RESET();
- return (char) readl(FFRBR) & 0xff;
-
- case BTUART_INDEX:
- while (!(readl(BTLSR) & LSR_DR))
- /* Reset HW Watchdog, if needed */
- WATCHDOG_RESET();
- return (char) readl(BTRBR) & 0xff;
- case STUART_INDEX:
- while (!(readl(STLSR) & LSR_DR))
- /* Reset HW Watchdog, if needed */
- WATCHDOG_RESET();
- return (char) readl(STRBR) & 0xff;
- }
- return -1;
-}
-
-void
-pxa_puts_dev (unsigned int uart_index,const char *s)
+int pxa_getc_dev(unsigned int uart_index)
{
- while (*s) {
- pxa_putc_dev (uart_index,*s++);
- }
-}
+ struct pxa_uart_regs *uart_regs;
-#if defined (CONFIG_FFUART)
-static int ffuart_init(void)
-{
- return pxa_init_dev(FFUART_INDEX);
-}
+ uart_regs = pxa_uart_index_to_regs(uart_index);
+ if (!uart_regs)
+ return -1;
-static void ffuart_setbrg(void)
-{
- return pxa_setbrg_dev(FFUART_INDEX);
+ while (!(readl(&uart_regs->lsr) & LSR_DR))
+ WATCHDOG_RESET();
+ return readl(&uart_regs->rbr) & 0xff;
}
-static void ffuart_putc(const char c)
+void pxa_puts_dev(unsigned int uart_index, const char *s)
{
- return pxa_putc_dev(FFUART_INDEX,c);
+ while (*s)
+ pxa_putc_dev(uart_index, *s++);
}
-static void ffuart_puts(const char *s)
-{
- return pxa_puts_dev(FFUART_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
-static int ffuart_getc(void)
+__weak struct serial_device *default_serial_console(void)
{
- return pxa_getc_dev(FFUART_INDEX);
+#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
}
-static int ffuart_tstc(void)
+void pxa_serial_initialize(void)
{
- return pxa_tstc_dev(FFUART_INDEX);
+#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
}
+#endif /* CONFIG_DM_SERIAL */
-struct serial_device serial_ffuart_device =
+#ifdef CONFIG_DM_SERIAL
+static int pxa_serial_probe(struct udevice *dev)
{
- "serial_ffuart",
- ffuart_init,
- NULL,
- ffuart_setbrg,
- ffuart_getc,
- ffuart_tstc,
- ffuart_putc,
- ffuart_puts,
-};
-#endif
+ struct pxa_serial_platdata *plat = dev->platdata;
-#if defined (CONFIG_BTUART)
-static int btuart_init(void)
-{
- return pxa_init_dev(BTUART_INDEX);
+ pxa_setbrg_common((struct pxa_uart_regs *)plat->base, plat->port,
+ plat->baudrate);
+ return 0;
}
-static void btuart_setbrg(void)
+static int pxa_serial_putc(struct udevice *dev, const char ch)
{
- return pxa_setbrg_dev(BTUART_INDEX);
-}
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
-static void btuart_putc(const char c)
-{
- return pxa_putc_dev(BTUART_INDEX,c);
-}
+ /* Wait for last character to go. */
+ if (!(readl(&uart_regs->lsr) & LSR_TEMT))
+ return -EAGAIN;
-static void btuart_puts(const char *s)
-{
- return pxa_puts_dev(BTUART_INDEX,s);
-}
+ writel(ch, &uart_regs->thr);
-static int btuart_getc(void)
-{
- return pxa_getc_dev(BTUART_INDEX);
+ return 0;
}
-static int btuart_tstc(void)
+static int pxa_serial_getc(struct udevice *dev)
{
- return pxa_tstc_dev(BTUART_INDEX);
-}
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
-struct serial_device serial_btuart_device =
-{
- "serial_btuart",
- btuart_init,
- NULL,
- btuart_setbrg,
- btuart_getc,
- btuart_tstc,
- btuart_putc,
- btuart_puts,
-};
-#endif
+ /* Wait for a character to arrive. */
+ if (!(readl(&uart_regs->lsr) & LSR_DR))
+ return -EAGAIN;
-#if defined (CONFIG_STUART)
-static int stuart_init(void)
-{
- return pxa_init_dev(STUART_INDEX);
+ return readl(&uart_regs->rbr) & 0xff;
}
-static void stuart_setbrg(void)
+int pxa_serial_setbrg(struct udevice *dev, int baudrate)
{
- return pxa_setbrg_dev(STUART_INDEX);
-}
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
+ int port = plat->port;
-static void stuart_putc(const char c)
-{
- return pxa_putc_dev(STUART_INDEX,c);
-}
+ pxa_setbrg_common(uart_regs, port, baudrate);
-static void stuart_puts(const char *s)
-{
- return pxa_puts_dev(STUART_INDEX,s);
+ return 0;
}
-static int stuart_getc(void)
+static int pxa_serial_pending(struct udevice *dev, bool input)
{
- return pxa_getc_dev(STUART_INDEX);
-}
+ struct pxa_serial_platdata *plat = dev->platdata;
+ struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
-static int stuart_tstc(void)
-{
- return pxa_tstc_dev(STUART_INDEX);
+ if (input)
+ return readl(&uart_regs->lsr) & LSR_DR ? 1 : 0;
+ else
+ return readl(&uart_regs->lsr) & LSR_TEMT ? 0 : 1;
+
+ return 0;
}
-struct serial_device serial_stuart_device =
-{
- "serial_stuart",
- stuart_init,
- NULL,
- stuart_setbrg,
- stuart_getc,
- stuart_tstc,
- stuart_putc,
- stuart_puts,
+static const struct dm_serial_ops pxa_serial_ops = {
+ .putc = pxa_serial_putc,
+ .pending = pxa_serial_pending,
+ .getc = pxa_serial_getc,
+ .setbrg = pxa_serial_setbrg,
};
-#endif
-
-#ifndef CONFIG_SERIAL_MULTI
-inline int serial_init(void) {
- return (pxa_init_dev(UART_INDEX));
-}
-void serial_setbrg(void) {
- pxa_setbrg_dev(UART_INDEX);
-}
-int serial_getc(void) {
- return(pxa_getc_dev(UART_INDEX));
-}
-int serial_tstc(void) {
- return(pxa_tstc_dev(UART_INDEX));
-}
-void serial_putc(const char c) {
- pxa_putc_dev(UART_INDEX,c);
-}
-void serial_puts(const char *s) {
- pxa_puts_dev(UART_INDEX,s);
-}
-#endif /* CONFIG_SERIAL_MULTI */
+U_BOOT_DRIVER(serial_pxa) = {
+ .name = "serial_pxa",
+ .id = UCLASS_SERIAL,
+ .probe = pxa_serial_probe,
+ .ops = &pxa_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
+#endif /* CONFIG_DM_SERIAL */
projects / oweals / u-boot.git / blobdiff