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https://github.com/brain-hackers/u-boot-brain
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caa4daa2ae
We use 'priv' for private data but often use 'platdata' for platform data. We can't really use 'pdata' since that is ambiguous (it could mean private or platform data). Rename some of the latter variables to end with 'plat' for consistency. Signed-off-by: Simon Glass <sjg@chromium.org>
174 lines
3.6 KiB
C
174 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Stefan Roese <sr@denx.de>
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*/
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#include <common.h>
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#include <dm.h>
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#include <serial.h>
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#include <asm/io.h>
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struct mvebu_platdata {
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void __iomem *base;
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};
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/*
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* Register offset
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*/
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#define UART_RX_REG 0x00
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#define UART_TX_REG 0x04
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#define UART_CTRL_REG 0x08
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#define UART_STATUS_REG 0x0c
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#define UART_BAUD_REG 0x10
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#define UART_POSSR_REG 0x14
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#define UART_STATUS_RX_RDY 0x10
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#define UART_STATUS_TXFIFO_FULL 0x800
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#define UART_CTRL_RXFIFO_RESET 0x4000
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#define UART_CTRL_TXFIFO_RESET 0x8000
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#define CONFIG_UART_BASE_CLOCK 25804800
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static int mvebu_serial_putc(struct udevice *dev, const char ch)
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{
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struct mvebu_platdata *plat = dev_get_platdata(dev);
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void __iomem *base = plat->base;
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while (readl(base + UART_STATUS_REG) & UART_STATUS_TXFIFO_FULL)
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;
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writel(ch, base + UART_TX_REG);
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return 0;
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}
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static int mvebu_serial_getc(struct udevice *dev)
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{
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struct mvebu_platdata *plat = dev_get_platdata(dev);
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void __iomem *base = plat->base;
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while (!(readl(base + UART_STATUS_REG) & UART_STATUS_RX_RDY))
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;
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return readl(base + UART_RX_REG) & 0xff;
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}
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static int mvebu_serial_pending(struct udevice *dev, bool input)
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{
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struct mvebu_platdata *plat = dev_get_platdata(dev);
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void __iomem *base = plat->base;
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if (readl(base + UART_STATUS_REG) & UART_STATUS_RX_RDY)
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return 1;
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return 0;
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}
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static int mvebu_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct mvebu_platdata *plat = dev_get_platdata(dev);
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void __iomem *base = plat->base;
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/*
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* Calculate divider
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* baudrate = clock / 16 / divider
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*/
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writel(CONFIG_UART_BASE_CLOCK / baudrate / 16, base + UART_BAUD_REG);
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/*
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* Set Programmable Oversampling Stack to 0,
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* UART defaults to 16x scheme
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*/
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writel(0, base + UART_POSSR_REG);
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return 0;
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}
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static int mvebu_serial_probe(struct udevice *dev)
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{
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struct mvebu_platdata *plat = dev_get_platdata(dev);
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void __iomem *base = plat->base;
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/* reset FIFOs */
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writel(UART_CTRL_RXFIFO_RESET | UART_CTRL_TXFIFO_RESET,
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base + UART_CTRL_REG);
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/* No Parity, 1 Stop */
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writel(0, base + UART_CTRL_REG);
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return 0;
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}
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static int mvebu_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct mvebu_platdata *plat = dev_get_platdata(dev);
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plat->base = dev_read_addr_ptr(dev);
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return 0;
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}
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static const struct dm_serial_ops mvebu_serial_ops = {
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.putc = mvebu_serial_putc,
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.pending = mvebu_serial_pending,
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.getc = mvebu_serial_getc,
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.setbrg = mvebu_serial_setbrg,
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};
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static const struct udevice_id mvebu_serial_ids[] = {
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{ .compatible = "marvell,armada-3700-uart" },
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{ }
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};
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U_BOOT_DRIVER(serial_mvebu) = {
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.name = "serial_mvebu",
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.id = UCLASS_SERIAL,
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.of_match = mvebu_serial_ids,
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.ofdata_to_platdata = mvebu_serial_ofdata_to_platdata,
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.plat_auto = sizeof(struct mvebu_platdata),
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.probe = mvebu_serial_probe,
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.ops = &mvebu_serial_ops,
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};
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#ifdef CONFIG_DEBUG_MVEBU_A3700_UART
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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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void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
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/* reset FIFOs */
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writel(UART_CTRL_RXFIFO_RESET | UART_CTRL_TXFIFO_RESET,
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base + UART_CTRL_REG);
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/* No Parity, 1 Stop */
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writel(0, base + UART_CTRL_REG);
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/*
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* Calculate divider
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* baudrate = clock / 16 / divider
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*/
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writel(CONFIG_UART_BASE_CLOCK / 115200 / 16, base + UART_BAUD_REG);
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/*
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* Set Programmable Oversampling Stack to 0,
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* UART defaults to 16x scheme
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*/
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writel(0, base + UART_POSSR_REG);
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}
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static inline void _debug_uart_putc(int ch)
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{
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void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
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while (readl(base + UART_STATUS_REG) & UART_STATUS_TXFIFO_FULL)
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;
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writel(ch, base + UART_TX_REG);
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}
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DEBUG_UART_FUNCS
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#endif
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