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![Simon Glass](/assets/img/avatar_default.png)
These support the flat device tree. We want to use the dev_read_..() prefix for functions that support both flat tree and live tree. So rename the existing functions to avoid confusion. In the end we will have: 1. dev_read_addr...() - works on devices, supports flat/live tree 2. devfdt_get_addr...() - current functions, flat tree only 3. of_get_address() etc. - new functions, live tree only All drivers will be written to use 1. That function will in turn call either 2 or 3 depending on whether the flat or live tree is in use. Note this involves changing some dead code - the imx_lpi2c.c file. Signed-off-by: Simon Glass <sjg@chromium.org>
233 lines
5.5 KiB
C
233 lines
5.5 KiB
C
/*
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* Copyright (C) 2012 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2011-2012 Xilinx, Inc. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <clk.h>
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#include <common.h>
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#include <debug_uart.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <watchdog.h>
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#include <asm/io.h>
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#include <linux/compiler.h>
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#include <serial.h>
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#include <asm/arch/hardware.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define ZYNQ_UART_SR_TXEMPTY (1 << 3) /* TX FIFO empty */
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#define ZYNQ_UART_SR_TXACTIVE (1 << 11) /* TX active */
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#define ZYNQ_UART_SR_RXEMPTY 0x00000002 /* RX FIFO empty */
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#define ZYNQ_UART_CR_TX_EN 0x00000010 /* TX enabled */
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#define ZYNQ_UART_CR_RX_EN 0x00000004 /* RX enabled */
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#define ZYNQ_UART_CR_TXRST 0x00000002 /* TX logic reset */
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#define ZYNQ_UART_CR_RXRST 0x00000001 /* RX logic reset */
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#define ZYNQ_UART_MR_PARITY_NONE 0x00000020 /* No parity mode */
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struct uart_zynq {
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u32 control; /* 0x0 - Control Register [8:0] */
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u32 mode; /* 0x4 - Mode Register [10:0] */
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u32 reserved1[4];
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u32 baud_rate_gen; /* 0x18 - Baud Rate Generator [15:0] */
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u32 reserved2[4];
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u32 channel_sts; /* 0x2c - Channel Status [11:0] */
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u32 tx_rx_fifo; /* 0x30 - FIFO [15:0] or [7:0] */
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u32 baud_rate_divider; /* 0x34 - Baud Rate Divider [7:0] */
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};
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struct zynq_uart_priv {
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struct uart_zynq *regs;
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};
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/* Set up the baud rate in gd struct */
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static void _uart_zynq_serial_setbrg(struct uart_zynq *regs,
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unsigned long clock, unsigned long baud)
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{
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/* Calculation results. */
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unsigned int calc_bauderror, bdiv, bgen;
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unsigned long calc_baud = 0;
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/* Covering case where input clock is so slow */
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if (clock < 1000000 && baud > 4800)
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baud = 4800;
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/* master clock
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* Baud rate = ------------------
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* bgen * (bdiv + 1)
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*
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* Find acceptable values for baud generation.
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*/
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for (bdiv = 4; bdiv < 255; bdiv++) {
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bgen = clock / (baud * (bdiv + 1));
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if (bgen < 2 || bgen > 65535)
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continue;
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calc_baud = clock / (bgen * (bdiv + 1));
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/*
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* Use first calculated baudrate with
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* an acceptable (<3%) error
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*/
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if (baud > calc_baud)
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calc_bauderror = baud - calc_baud;
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else
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calc_bauderror = calc_baud - baud;
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if (((calc_bauderror * 100) / baud) < 3)
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break;
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}
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writel(bdiv, ®s->baud_rate_divider);
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writel(bgen, ®s->baud_rate_gen);
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}
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/* Initialize the UART, with...some settings. */
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static void _uart_zynq_serial_init(struct uart_zynq *regs)
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{
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/* RX/TX enabled & reset */
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writel(ZYNQ_UART_CR_TX_EN | ZYNQ_UART_CR_RX_EN | ZYNQ_UART_CR_TXRST | \
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ZYNQ_UART_CR_RXRST, ®s->control);
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writel(ZYNQ_UART_MR_PARITY_NONE, ®s->mode); /* 8 bit, no parity */
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}
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static int _uart_zynq_serial_putc(struct uart_zynq *regs, const char c)
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{
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if (!(readl(®s->channel_sts) & ZYNQ_UART_SR_TXEMPTY))
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return -EAGAIN;
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writel(c, ®s->tx_rx_fifo);
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return 0;
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}
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int zynq_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct zynq_uart_priv *priv = dev_get_priv(dev);
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unsigned long clock;
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int ret;
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struct clk clk;
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret < 0) {
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dev_err(dev, "failed to get clock\n");
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return ret;
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}
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clock = clk_get_rate(&clk);
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if (IS_ERR_VALUE(clock)) {
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dev_err(dev, "failed to get rate\n");
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return clock;
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}
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debug("%s: CLK %ld\n", __func__, clock);
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ret = clk_enable(&clk);
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if (ret && ret != -ENOSYS) {
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dev_err(dev, "failed to enable clock\n");
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return ret;
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}
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_uart_zynq_serial_setbrg(priv->regs, clock, baudrate);
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return 0;
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}
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static int zynq_serial_probe(struct udevice *dev)
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{
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struct zynq_uart_priv *priv = dev_get_priv(dev);
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_uart_zynq_serial_init(priv->regs);
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return 0;
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}
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static int zynq_serial_getc(struct udevice *dev)
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{
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struct zynq_uart_priv *priv = dev_get_priv(dev);
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struct uart_zynq *regs = priv->regs;
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if (readl(®s->channel_sts) & ZYNQ_UART_SR_RXEMPTY)
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return -EAGAIN;
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return readl(®s->tx_rx_fifo);
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}
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static int zynq_serial_putc(struct udevice *dev, const char ch)
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{
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struct zynq_uart_priv *priv = dev_get_priv(dev);
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return _uart_zynq_serial_putc(priv->regs, ch);
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}
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static int zynq_serial_pending(struct udevice *dev, bool input)
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{
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struct zynq_uart_priv *priv = dev_get_priv(dev);
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struct uart_zynq *regs = priv->regs;
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if (input)
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return !(readl(®s->channel_sts) & ZYNQ_UART_SR_RXEMPTY);
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else
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return !!(readl(®s->channel_sts) & ZYNQ_UART_SR_TXACTIVE);
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}
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static int zynq_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct zynq_uart_priv *priv = dev_get_priv(dev);
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priv->regs = (struct uart_zynq *)devfdt_get_addr(dev);
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return 0;
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}
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static const struct dm_serial_ops zynq_serial_ops = {
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.putc = zynq_serial_putc,
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.pending = zynq_serial_pending,
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.getc = zynq_serial_getc,
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.setbrg = zynq_serial_setbrg,
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};
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static const struct udevice_id zynq_serial_ids[] = {
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{ .compatible = "xlnx,xuartps" },
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{ .compatible = "cdns,uart-r1p8" },
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{ .compatible = "cdns,uart-r1p12" },
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{ }
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};
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U_BOOT_DRIVER(serial_zynq) = {
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.name = "serial_zynq",
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.id = UCLASS_SERIAL,
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.of_match = zynq_serial_ids,
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.ofdata_to_platdata = zynq_serial_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct zynq_uart_priv),
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.probe = zynq_serial_probe,
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.ops = &zynq_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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#ifdef CONFIG_DEBUG_UART_ZYNQ
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static inline void _debug_uart_init(void)
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{
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struct uart_zynq *regs = (struct uart_zynq *)CONFIG_DEBUG_UART_BASE;
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_uart_zynq_serial_init(regs);
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_uart_zynq_serial_setbrg(regs, CONFIG_DEBUG_UART_CLOCK,
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CONFIG_BAUDRATE);
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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 uart_zynq *regs = (struct uart_zynq *)CONFIG_DEBUG_UART_BASE;
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while (_uart_zynq_serial_putc(regs, ch) == -EAGAIN)
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WATCHDOG_RESET();
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}
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DEBUG_UART_FUNCS
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#endif
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