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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
219 lines
5.2 KiB
C
219 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2013-2016 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <watchdog.h>
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#include <asm/io.h>
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#include <serial.h>
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#include <linux/compiler.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/clock.h>
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#define US1_TDRE (1 << 7)
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#define US1_RDRF (1 << 5)
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#define UC2_TE (1 << 3)
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#define LINCR1_INIT (1 << 0)
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#define LINCR1_MME (1 << 4)
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#define LINCR1_BF (1 << 7)
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#define LINSR_LINS_INITMODE (0x00001000)
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#define LINSR_LINS_MASK (0x0000F000)
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#define UARTCR_UART (1 << 0)
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#define UARTCR_WL0 (1 << 1)
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#define UARTCR_PCE (1 << 2)
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#define UARTCR_PC0 (1 << 3)
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#define UARTCR_TXEN (1 << 4)
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#define UARTCR_RXEN (1 << 5)
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#define UARTCR_PC1 (1 << 6)
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#define UARTSR_DTF (1 << 1)
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#define UARTSR_DRF (1 << 2)
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#define UARTSR_RMB (1 << 9)
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DECLARE_GLOBAL_DATA_PTR;
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static void _linflex_serial_setbrg(struct linflex_fsl *base, int baudrate)
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{
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u32 clk = mxc_get_clock(MXC_UART_CLK);
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u32 ibr, fbr;
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if (!baudrate)
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baudrate = CONFIG_BAUDRATE;
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ibr = (u32) (clk / (16 * gd->baudrate));
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fbr = (u32) (clk % (16 * gd->baudrate)) * 16;
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__raw_writel(ibr, &base->linibrr);
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__raw_writel(fbr, &base->linfbrr);
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}
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static int _linflex_serial_getc(struct linflex_fsl *base)
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{
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char c;
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if (!(__raw_readb(&base->uartsr) & UARTSR_DRF))
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return -EAGAIN;
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if (!(__raw_readl(&base->uartsr) & UARTSR_RMB))
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return -EAGAIN;
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c = __raw_readl(&base->bdrm);
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__raw_writeb((__raw_readb(&base->uartsr) | (UARTSR_DRF | UARTSR_RMB)),
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&base->uartsr);
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return c;
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}
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static int _linflex_serial_putc(struct linflex_fsl *base, const char c)
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{
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__raw_writeb(c, &base->bdrl);
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if (!(__raw_readb(&base->uartsr) & UARTSR_DTF))
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return -EAGAIN;
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__raw_writeb((__raw_readb(&base->uartsr) | UARTSR_DTF), &base->uartsr);
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return 0;
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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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static int _linflex_serial_init(struct linflex_fsl *base)
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{
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volatile u32 ctrl;
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/* set the Linflex in master mode amd activate by-pass filter */
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ctrl = LINCR1_BF | LINCR1_MME;
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__raw_writel(ctrl, &base->lincr1);
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/* init mode */
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ctrl |= LINCR1_INIT;
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__raw_writel(ctrl, &base->lincr1);
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/* waiting for init mode entry - TODO: add a timeout */
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while ((__raw_readl(&base->linsr) & LINSR_LINS_MASK) !=
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LINSR_LINS_INITMODE);
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/* set UART bit to allow writing other bits */
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__raw_writel(UARTCR_UART, &base->uartcr);
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/* provide data bits, parity, stop bit, etc */
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serial_setbrg();
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/* 8 bit data, no parity, Tx and Rx enabled, UART mode */
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__raw_writel(UARTCR_PC1 | UARTCR_RXEN | UARTCR_TXEN | UARTCR_PC0
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| UARTCR_WL0 | UARTCR_UART, &base->uartcr);
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ctrl = __raw_readl(&base->lincr1);
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ctrl &= ~LINCR1_INIT;
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__raw_writel(ctrl, &base->lincr1); /* end init mode */
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return 0;
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}
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struct linflex_serial_platdata {
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struct linflex_fsl *base_addr;
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u8 port_id; /* do we need this? */
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};
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struct linflex_serial_priv {
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struct linflex_fsl *lfuart;
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};
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int linflex_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct linflex_serial_priv *priv = dev_get_priv(dev);
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_linflex_serial_setbrg(priv->lfuart, baudrate);
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return 0;
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}
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static int linflex_serial_getc(struct udevice *dev)
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{
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struct linflex_serial_priv *priv = dev_get_priv(dev);
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return _linflex_serial_getc(priv->lfuart);
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}
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static int linflex_serial_putc(struct udevice *dev, const char ch)
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{
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struct linflex_serial_priv *priv = dev_get_priv(dev);
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return _linflex_serial_putc(priv->lfuart, ch);
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}
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static int linflex_serial_pending(struct udevice *dev, bool input)
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{
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struct linflex_serial_priv *priv = dev_get_priv(dev);
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uint32_t uartsr = __raw_readl(&priv->lfuart->uartsr);
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if (input)
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return ((uartsr & UARTSR_DRF) && (uartsr & UARTSR_RMB)) ? 1 : 0;
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else
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return uartsr & UARTSR_DTF ? 0 : 1;
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}
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static void linflex_serial_init_internal(struct linflex_fsl *lfuart)
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{
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_linflex_serial_init(lfuart);
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_linflex_serial_setbrg(lfuart, CONFIG_BAUDRATE);
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return;
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}
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static int linflex_serial_probe(struct udevice *dev)
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{
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struct linflex_serial_platdata *plat = dev->platdata;
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struct linflex_serial_priv *priv = dev_get_priv(dev);
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priv->lfuart = (struct linflex_fsl *)plat->base_addr;
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linflex_serial_init_internal(priv->lfuart);
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return 0;
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}
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static const struct dm_serial_ops linflex_serial_ops = {
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.putc = linflex_serial_putc,
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.pending = linflex_serial_pending,
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.getc = linflex_serial_getc,
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.setbrg = linflex_serial_setbrg,
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};
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U_BOOT_DRIVER(serial_linflex) = {
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.name = "serial_linflex",
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.id = UCLASS_SERIAL,
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.probe = linflex_serial_probe,
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.ops = &linflex_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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.priv_auto_alloc_size = sizeof(struct linflex_serial_priv),
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};
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#ifdef CONFIG_DEBUG_UART_LINFLEXUART
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#include <debug_uart.h>
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static inline void _debug_uart_init(void)
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{
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struct linflex_fsl *base = (struct linflex_fsl *)CONFIG_DEBUG_UART_BASE;
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linflex_serial_init_internal(base);
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}
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static inline void _debug_uart_putc(int ch)
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{
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struct linflex_fsl *base = (struct linflex_fsl *)CONFIG_DEBUG_UART_BASE;
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/* XXX: Is this OK? Should this use the non-DM version? */
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_linflex_serial_putc(base, ch);
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}
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DEBUG_UART_FUNCS
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#endif /* CONFIG_DEBUG_UART_LINFLEXUART */
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