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218 lines
5.2 KiB
218 lines
5.2 KiB
// 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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