From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [RFC 2/8] serial: add driver for Canon DIGIC UART
Date: Mon, 26 Aug 2013 08:57:11 +0400 [thread overview]
Message-ID: <1377493037-2229-3-git-send-email-antonynpavlov@gmail.com> (raw)
In-Reply-To: <1377493037-2229-1-git-send-email-antonynpavlov@gmail.com>
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
drivers/serial/Kconfig | 4 ++
drivers/serial/Makefile | 1 +
drivers/serial/serial_digic.c | 131 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 136 insertions(+)
create mode 100644 drivers/serial/serial_digic.c
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 11fc155..541350d 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -122,4 +122,8 @@ config DRIVER_SERIAL_CADENCE
help
Say Y here if you have a Cadence serial IP core.
+config DRIVER_SERIAL_DIGIC
+ bool "Canon DIGIC serial driver"
+ depends on ARCH_DIGIC
+
endmenu
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 93790b5..485a3ef 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_DRIVER_SERIAL_PXA) += serial_pxa.o
obj-$(CONFIG_DRIVER_SERIAL_OMAP4_USBBOOT) += serial_omap4_usbboot.o
obj-$(CONFIG_DRIVER_SERIAL_AUART) += serial_auart.o
obj-$(CONFIG_DRIVER_SERIAL_CADENCE) += serial_cadence.o
+obj-$(CONFIG_DRIVER_SERIAL_DIGIC) += serial_digic.o
diff --git a/drivers/serial/serial_digic.c b/drivers/serial/serial_digic.c
new file mode 100644
index 0000000..938172f
--- /dev/null
+++ b/drivers/serial/serial_digic.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2013 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <malloc.h>
+#include <io.h>
+
+/* Serial interface registers offsets */
+#define UART_TX 0x0
+#define UART_RX 0x4
+#define UART_ST 0x14
+ #define UART_ST_RX_RDY 1
+ #define UART_ST_TX_RDY 2
+
+/*
+ * This driver is based on the "Serial terminal" docs here:
+ * http://magiclantern.wikia.com/wiki/Register_Map#Misc_Registers
+ *
+ * See also disassembler output for Canon A1100IS firmware
+ * (version a1100_100c):
+ * * a outc-like function can be found at address 0xffff18f0;
+ * * a getc-like function can be found at address 0xffff192c.
+ */
+
+static inline uint32_t digic_serial_readl(struct console_device *cdev, uint32_t off)
+{
+ void *digic = cdev->dev->priv;
+
+ return readl(digic + off);
+}
+
+static inline void digic_serial_writel(struct console_device *cdev, uint32_t val,
+ uint32_t off)
+{
+ void *digic = cdev->dev->priv;
+
+ writel(val, digic + off);
+}
+
+static int digic_serial_setbaudrate(struct console_device *cdev, int baudrate)
+{
+ /* FIXME: empty */
+
+ return 0;
+}
+
+static void digic_serial_putc(struct console_device *cdev, char c)
+{
+ while (!(digic_serial_readl(cdev, UART_ST) & UART_ST_TX_RDY))
+ ; /* noop */
+
+ digic_serial_writel(cdev, 0x06, UART_ST);
+ digic_serial_writel(cdev, c, UART_TX);
+}
+
+static int digic_serial_getc(struct console_device *cdev)
+{
+ while (!(digic_serial_readl(cdev, UART_ST) & UART_ST_RX_RDY))
+ ; /* noop */
+
+ digic_serial_writel(cdev, 0x01, UART_ST);
+
+ return digic_serial_readl(cdev, UART_RX);
+}
+
+static int digic_serial_tstc(struct console_device *cdev)
+{
+ return ((digic_serial_readl(cdev, UART_ST) & UART_ST_RX_RDY) != 0);
+
+ /*
+ * Canon folks use additional check, something like this:
+ *
+ * if (digic_serial_readl(cdev, UART_ST) & 0x38) {
+ * digic_serial_writel(cdev, 0x38, UART_ST);
+ * return 0;
+ * }
+ *
+ * But I know nothing about these magic bits in the status regster...
+ *
+ */
+}
+
+static int digic_serial_probe(struct device_d *dev)
+{
+ struct console_device *cdev;
+
+ cdev = xzalloc(sizeof(struct console_device));
+ dev->priv = dev_request_mem_region(dev, 0);
+ cdev->dev = dev;
+ cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+ cdev->tstc = &digic_serial_tstc;
+ cdev->putc = &digic_serial_putc;
+ cdev->getc = &digic_serial_getc;
+ cdev->setbrg = &digic_serial_setbaudrate;
+
+ /* FIXME: need digic_init_port(cdev); */
+
+ console_register(cdev);
+
+ return 0;
+}
+
+static __maybe_unused struct of_device_id digic_serial_dt_ids[] = {
+ {
+ .compatible = "canon,digic-serial",
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct driver_d digic_serial_driver = {
+ .name = "digic-serial",
+ .probe = digic_serial_probe,
+ .of_compatible = DRV_OF_COMPAT(digic_serial_dt_ids),
+};
+console_platform_driver(digic_serial_driver);
--
1.8.4.rc3
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next prev parent reply other threads:[~2013-08-26 5:00 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-26 4:57 [RFC 0/8] barebox on Canon cameras: serial console and dts support Antony Pavlov
2013-08-26 4:57 ` [RFC 1/8] ARM: add very initial support for Canon DIGIC chips Antony Pavlov
2013-08-26 13:20 ` Jason Cooper
2013-08-26 18:51 ` Antony Pavlov
2013-08-26 19:47 ` Jason Cooper
2013-08-26 23:32 ` Sebastian Hesselbarth
2013-08-27 1:46 ` Jason Cooper
2013-08-27 4:57 ` Antony Pavlov
2013-08-27 7:00 ` Jürgen Beisert
2013-08-26 4:57 ` Antony Pavlov [this message]
2013-08-26 13:28 ` [RFC 2/8] serial: add driver for Canon DIGIC UART Jason Cooper
2013-08-26 4:57 ` [RFC 3/8] gpio: add driver for Canon DIGIC Antony Pavlov
2013-08-26 4:57 ` [RFC 4/8] ARM: DIGIC: add Canon PowerShot A1100 IS support Antony Pavlov
2013-08-26 4:57 ` [RFC 5/8] ARM: DIGIC: add canon-a1100_defconfig Antony Pavlov
2013-08-26 4:57 ` [RFC 6/8] ARM: DIGIC: add csrc-dummy Antony Pavlov
2013-08-26 4:57 ` [RFC 7/8] ARM: DIGIC: add Canon EOS 600D support Antony Pavlov
2013-08-26 4:57 ` [RFC 8/8] ARM: DIGIC: add canon-600d_defconfig Antony Pavlov
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