Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 177 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250_men_mcb.c b/drivers/tty/serial/8250/8250_men_mcb.c
new file mode 100644
index 000000000..737c4c31e
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_men_mcb.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/mcb.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <uapi/linux/serial_core.h>
+
+#define MEN_UART_ID_Z025 0x19
+#define MEN_UART_ID_Z057 0x39
+#define MEN_UART_ID_Z125 0x7d
+
+#define MEN_UART_MEM_SIZE 0x10
+
+struct serial_8250_men_mcb_data {
+	struct uart_8250_port uart;
+	int line;
+};
+
+/*
+ * The Z125 16550-compatible UART has no fixed base clock assigned
+ * So, depending on the board we're on, we need to adjust the
+ * parameter in order to really set the correct baudrate, and
+ * do so if possible without user interaction
+ */
+static u32 men_lookup_uartclk(struct mcb_device *mdev)
+{
+	/* use default value if board is not available below */
+	u32 clkval = 1041666;
+
+	dev_info(&mdev->dev, "%s on board %s\n",
+		dev_name(&mdev->dev),
+		mdev->bus->name);
+	if  (strncmp(mdev->bus->name, "F075", 4) == 0)
+		clkval = 1041666;
+	else if (strncmp(mdev->bus->name, "F216", 4) == 0)
+		clkval = 1843200;
+	else if (strncmp(mdev->bus->name, "G215", 4) == 0)
+		clkval = 1843200;
+	else if (strncmp(mdev->bus->name, "F210", 4) == 0)
+		clkval = 115200;
+	else
+		dev_info(&mdev->dev,
+			 "board not detected, using default uartclk\n");
+
+	clkval = clkval  << 4;
+
+	return clkval;
+}
+
+static int get_num_ports(struct mcb_device *mdev,
+				  void __iomem *membase)
+{
+	switch (mdev->id) {
+	case MEN_UART_ID_Z125:
+		return 1U;
+	case MEN_UART_ID_Z025:
+		return readb(membase) >> 4;
+	case MEN_UART_ID_Z057:
+		return 4U;
+	default:
+		dev_err(&mdev->dev, "no supported device!\n");
+		return -ENODEV;
+	}
+}
+
+static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
+				     const struct mcb_device_id *id)
+{
+	struct serial_8250_men_mcb_data *data;
+	struct resource *mem;
+	int num_ports;
+	int i;
+	void __iomem *membase;
+
+	mem = mcb_get_resource(mdev, IORESOURCE_MEM);
+	if (mem == NULL)
+		return -ENXIO;
+	membase = devm_ioremap_resource(&mdev->dev, mem);
+	if (IS_ERR(membase))
+		return PTR_ERR_OR_ZERO(membase);
+
+	num_ports = get_num_ports(mdev, membase);
+
+	dev_dbg(&mdev->dev, "found a 16z%03u with %u ports\n",
+		mdev->id, num_ports);
+
+	if (num_ports <= 0 || num_ports > 4) {
+		dev_err(&mdev->dev, "unexpected number of ports: %u\n",
+			num_ports);
+		return -ENODEV;
+	}
+
+	data = devm_kcalloc(&mdev->dev, num_ports,
+			    sizeof(struct serial_8250_men_mcb_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	mcb_set_drvdata(mdev, data);
+
+	for (i = 0; i < num_ports; i++) {
+		data[i].uart.port.dev = mdev->dma_dev;
+		spin_lock_init(&data[i].uart.port.lock);
+
+		data[i].uart.port.type = PORT_16550;
+		data[i].uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ
+					  | UPF_FIXED_TYPE;
+		data[i].uart.port.iotype = UPIO_MEM;
+		data[i].uart.port.uartclk = men_lookup_uartclk(mdev);
+		data[i].uart.port.regshift = 0;
+		data[i].uart.port.irq = mcb_get_irq(mdev);
+		data[i].uart.port.membase = membase;
+		data[i].uart.port.fifosize = 60;
+		data[i].uart.port.mapbase = (unsigned long) mem->start
+					    + i * MEN_UART_MEM_SIZE;
+		data[i].uart.port.iobase = data[i].uart.port.mapbase;
+
+		/* ok, register the port */
+		data[i].line = serial8250_register_8250_port(&data[i].uart);
+		if (data[i].line < 0) {
+			dev_err(&mdev->dev, "unable to register UART port\n");
+			return data[i].line;
+		}
+		dev_info(&mdev->dev, "found MCB UART: ttyS%d\n", data[i].line);
+	}
+
+	return 0;
+}
+
+static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
+{
+	int num_ports, i;
+	struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
+
+	if (!data)
+		return;
+
+	num_ports = get_num_ports(mdev, data[0].uart.port.membase);
+	if (num_ports <= 0 || num_ports > 4) {
+		dev_err(&mdev->dev, "error retrieving number of ports!\n");
+		return;
+	}
+
+	for (i = 0; i < num_ports; i++)
+		serial8250_unregister_port(data[i].line);
+}
+
+static const struct mcb_device_id serial_8250_men_mcb_ids[] = {
+	{ .device = MEN_UART_ID_Z025 },
+	{ .device = MEN_UART_ID_Z057 },
+	{ .device = MEN_UART_ID_Z125 },
+	{ }
+};
+MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids);
+
+static struct mcb_driver mcb_driver = {
+	.driver = {
+		.name = "8250_men_mcb",
+		.owner = THIS_MODULE,
+	},
+	.probe = serial_8250_men_mcb_probe,
+	.remove = serial_8250_men_mcb_remove,
+	.id_table = serial_8250_men_mcb_ids,
+};
+module_mcb_driver(mcb_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MEN 8250 UART driver");
+MODULE_AUTHOR("Michael Moese <michael.moese@men.de");
+MODULE_ALIAS("mcb:16z125");
+MODULE_ALIAS("mcb:16z025");
+MODULE_ALIAS("mcb:16z057");
+MODULE_IMPORT_NS(MCB);