serial: add driver for Canon DIGIC UART
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -129,4 +129,8 @@ config DRIVER_SERIAL_CADENCE
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help
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Say Y here if you have a Cadence serial IP core.
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config DRIVER_SERIAL_DIGIC
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bool "Canon DIGIC serial driver"
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depends on ARCH_DIGIC
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endmenu
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@ -18,3 +18,4 @@ obj-$(CONFIG_DRIVER_SERIAL_PXA) += serial_pxa.o
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obj-$(CONFIG_DRIVER_SERIAL_OMAP4_USBBOOT) += serial_omap4_usbboot.o
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obj-$(CONFIG_DRIVER_SERIAL_AUART) += serial_auart.o
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obj-$(CONFIG_DRIVER_SERIAL_CADENCE) += serial_cadence.o
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obj-$(CONFIG_DRIVER_SERIAL_DIGIC) += serial_digic.o
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@ -0,0 +1,132 @@
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/*
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* Copyright (C) 2013, 2014 Antony Pavlov <antonynpavlov@gmail.com>
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*
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* This file is part of barebox.
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* See file CREDITS for list of people who contributed to this project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <malloc.h>
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#include <io.h>
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#include <mach/uart.h>
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/*
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* This driver is based on the "Serial terminal" docs here:
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* http://magiclantern.wikia.com/wiki/Register_Map#Misc_Registers
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*
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* See also disassembler output for Canon A1100IS firmware
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* (version a1100_100c):
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* * a outc-like function can be found at address 0xffff18f0;
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* * a getc-like function can be found at address 0xffff192c.
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*/
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static inline uint32_t digic_serial_readl(struct console_device *cdev,
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uint32_t offset)
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{
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void __iomem *base = cdev->dev->priv;
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return readl(base + offset);
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}
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static inline void digic_serial_writel(struct console_device *cdev,
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uint32_t value, uint32_t offset)
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{
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void __iomem *base = cdev->dev->priv;
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writel(value, base + offset);
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}
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static int digic_serial_setbaudrate(struct console_device *cdev, int baudrate)
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{
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/* I don't know how to setup baudrate :( */
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return 0;
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}
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static void digic_serial_putc(struct console_device *cdev, char c)
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{
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uint32_t status;
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do {
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status = digic_serial_readl(cdev, DIGIC_UART_ST);
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} while (!(status & DIGIC_UART_ST_TX_RDY));
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digic_serial_writel(cdev, 0x06, DIGIC_UART_ST);
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digic_serial_writel(cdev, c, DIGIC_UART_TX);
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}
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static int digic_serial_getc(struct console_device *cdev)
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{
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uint32_t status;
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do {
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status = digic_serial_readl(cdev, DIGIC_UART_ST);
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} while (!(status & DIGIC_UART_ST_RX_RDY));
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digic_serial_writel(cdev, 0x01, DIGIC_UART_ST);
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return digic_serial_readl(cdev, DIGIC_UART_RX);
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}
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static int digic_serial_tstc(struct console_device *cdev)
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{
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uint32_t status = digic_serial_readl(cdev, DIGIC_UART_ST);
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return ((status & DIGIC_UART_ST_RX_RDY) != 0);
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/*
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* Canon folks use additional check, something like this:
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*
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* if (digic_serial_readl(cdev, DIGIC_UART_ST) & 0x38) {
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* digic_serial_writel(cdev, 0x38, DIGIC_UART_ST);
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* return 0;
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* }
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*
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* But I know nothing about these magic bits in the status register...
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*
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*/
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}
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static int digic_serial_probe(struct device_d *dev)
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{
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struct console_device *cdev;
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cdev = xzalloc(sizeof(struct console_device));
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dev->priv = dev_request_mem_region(dev, 0);
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cdev->dev = dev;
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cdev->tstc = &digic_serial_tstc;
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cdev->putc = &digic_serial_putc;
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cdev->getc = &digic_serial_getc;
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cdev->setbrg = &digic_serial_setbaudrate;
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console_register(cdev);
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return 0;
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}
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static __maybe_unused struct of_device_id digic_serial_dt_ids[] = {
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{
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.compatible = "canon,digic-uart",
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}, {
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/* sentinel */
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}
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};
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static struct driver_d digic_serial_driver = {
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.name = "digic-uart",
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.probe = digic_serial_probe,
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.of_compatible = DRV_OF_COMPAT(digic_serial_dt_ids),
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};
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console_platform_driver(digic_serial_driver);
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