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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
178 lines
5.0 KiB
C
178 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012-2015 Panasonic Corporation
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* Copyright (C) 2015-2016 Socionext Inc.
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* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/io.h>
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#include <linux/serial_reg.h>
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#include <linux/sizes.h>
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#include <linux/errno.h>
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#include <serial.h>
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#include <fdtdec.h>
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#define UNIPHIER_UART_REGSHIFT 2
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#define UNIPHIER_UART_RX (0 << (UNIPHIER_UART_REGSHIFT))
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#define UNIPHIER_UART_TX UNIPHIER_UART_RX
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/* bit[15:8] = CHAR, bit[7:0] = FCR */
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#define UNIPHIER_UART_CHAR_FCR (3 << (UNIPHIER_UART_REGSHIFT))
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#define UNIPHIER_UART_FCR_MASK GENMASK(7, 0)
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/* bit[15:8] = LCR, bit[7:0] = MCR */
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#define UNIPHIER_UART_LCR_MCR (4 << (UNIPHIER_UART_REGSHIFT))
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#define UNIPHIER_UART_LCR_MASK GENMASK(15, 8)
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#define UNIPHIER_UART_LSR (5 << (UNIPHIER_UART_REGSHIFT))
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/* Divisor Latch Register */
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#define UNIPHIER_UART_DLR (9 << (UNIPHIER_UART_REGSHIFT))
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struct uniphier_serial_priv {
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void __iomem *membase;
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unsigned int uartclk;
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};
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static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct uniphier_serial_priv *priv = dev_get_priv(dev);
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static const unsigned int mode_x_div = 16;
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unsigned int divisor;
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divisor = DIV_ROUND_CLOSEST(priv->uartclk, mode_x_div * baudrate);
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/* flush the trasmitter before changing hw setting */
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while (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_TEMT))
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;
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writel(divisor, priv->membase + UNIPHIER_UART_DLR);
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return 0;
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}
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static int uniphier_serial_getc(struct udevice *dev)
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{
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struct uniphier_serial_priv *priv = dev_get_priv(dev);
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if (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_DR))
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return -EAGAIN;
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return readl(priv->membase + UNIPHIER_UART_RX);
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}
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static int uniphier_serial_putc(struct udevice *dev, const char c)
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{
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struct uniphier_serial_priv *priv = dev_get_priv(dev);
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if (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_THRE))
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return -EAGAIN;
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writel(c, priv->membase + UNIPHIER_UART_TX);
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return 0;
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}
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static int uniphier_serial_pending(struct udevice *dev, bool input)
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{
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struct uniphier_serial_priv *priv = dev_get_priv(dev);
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if (input)
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return readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_DR;
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else
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return !(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_THRE);
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}
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/*
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* SPL does not have enough memory footprint for the clock driver.
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* Hardcode clock frequency for each SoC.
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*/
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struct uniphier_serial_clk_data {
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const char *compatible;
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unsigned int clk_rate;
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};
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static const struct uniphier_serial_clk_data uniphier_serial_clk_data[] = {
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{ .compatible = "socionext,uniphier-ld4", .clk_rate = 36864000 },
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{ .compatible = "socionext,uniphier-pro4", .clk_rate = 73728000 },
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{ .compatible = "socionext,uniphier-sld8", .clk_rate = 80000000 },
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{ .compatible = "socionext,uniphier-pro5", .clk_rate = 73728000 },
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{ .compatible = "socionext,uniphier-pxs2", .clk_rate = 88888888 },
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{ .compatible = "socionext,uniphier-ld6b", .clk_rate = 88888888 },
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{ .compatible = "socionext,uniphier-ld11", .clk_rate = 58823529 },
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{ .compatible = "socionext,uniphier-ld20", .clk_rate = 58823529 },
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{ .compatible = "socionext,uniphier-pxs3", .clk_rate = 58823529 },
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{ /* sentinel */ },
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};
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static int uniphier_serial_probe(struct udevice *dev)
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{
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struct uniphier_serial_priv *priv = dev_get_priv(dev);
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const struct uniphier_serial_clk_data *clk_data;
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ofnode root_node;
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fdt_addr_t base;
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u32 tmp;
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base = dev_read_addr(dev);
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if (base == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->membase = devm_ioremap(dev, base, SZ_64);
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if (!priv->membase)
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return -ENOMEM;
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root_node = ofnode_path("/");
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clk_data = uniphier_serial_clk_data;
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while (clk_data->compatible) {
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if (ofnode_device_is_compatible(root_node,
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clk_data->compatible))
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break;
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clk_data++;
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}
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if (WARN_ON(!clk_data->compatible))
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return -ENOTSUPP;
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priv->uartclk = clk_data->clk_rate;
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/* flush the trasmitter before changing hw setting */
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while (!(readl(priv->membase + UNIPHIER_UART_LSR) & UART_LSR_TEMT))
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;
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/* enable FIFO */
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tmp = readl(priv->membase + UNIPHIER_UART_CHAR_FCR);
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tmp &= ~UNIPHIER_UART_FCR_MASK;
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tmp |= FIELD_PREP(UNIPHIER_UART_FCR_MASK, UART_FCR_ENABLE_FIFO);
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writel(tmp, priv->membase + UNIPHIER_UART_CHAR_FCR);
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tmp = readl(priv->membase + UNIPHIER_UART_LCR_MCR);
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tmp &= ~UNIPHIER_UART_LCR_MASK;
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tmp |= FIELD_PREP(UNIPHIER_UART_LCR_MASK, UART_LCR_WLEN8);
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writel(tmp, priv->membase + UNIPHIER_UART_LCR_MCR);
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return 0;
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}
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static const struct udevice_id uniphier_uart_of_match[] = {
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{ .compatible = "socionext,uniphier-uart" },
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{ /* sentinel */ }
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};
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static const struct dm_serial_ops uniphier_serial_ops = {
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.setbrg = uniphier_serial_setbrg,
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.getc = uniphier_serial_getc,
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.putc = uniphier_serial_putc,
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.pending = uniphier_serial_pending,
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};
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U_BOOT_DRIVER(uniphier_serial) = {
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.name = "uniphier-uart",
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.id = UCLASS_SERIAL,
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.of_match = uniphier_uart_of_match,
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.probe = uniphier_serial_probe,
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.priv_auto = sizeof(struct uniphier_serial_priv),
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.ops = &uniphier_serial_ops,
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};
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