@@ -1,24 +1,50 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Freescale 16550 UART "driver"
+//
+// Copyright (C) 2011 Paul Gortmaker.
+// Copyright 2020 NXP
+// Copyright 2020 Puresoftware Ltd
+//
+// This isn't a full driver; it just provides an alternate IRQ
+// handler to deal with an errata. Everything else is just
+// using the bog standard 8250 support.
+//
+// We follow code flow of serial8250_default_handle_irq() but add
+// a check for a break and insert a dummy read on the Rx for the
+// immediately following IRQ event.
+//
+// We re-use the already existing "bug handling" lsr_saved_flags
+// field to carry the "what we just did" information from the one
+// IRQ event to the next one.
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
#include <linux/serial_reg.h>
#include <linux/serial_8250.h>
+
+#include <asm/byteorder.h>
+
#include "8250.h"
-/*
- * Freescale 16550 UART "driver", Copyright (C) 2011 Paul Gortmaker.
- *
- * This isn't a full driver; it just provides an alternate IRQ
- * handler to deal with an errata. Everything else is just
- * using the bog standard 8250 support.
- *
- * We follow code flow of serial8250_default_handle_irq() but add
- * a check for a break and insert a dummy read on the Rx for the
- * immediately following IRQ event.
- *
- * We re-use the already existing "bug handling" lsr_saved_flags
- * field to carry the "what we just did" information from the one
- * IRQ event to the next one.
- */
+#define DRIVER_NAME "fsl-ns16550-uart"
+
+struct fsl8250_data {
+ int line;
+};
int fsl8250_handle_irq(struct uart_port *port)
{
@@ -79,3 +105,92 @@ int fsl8250_handle_irq(struct uart_port *port)
return 1;
}
EXPORT_SYMBOL_GPL(fsl8250_handle_irq);
+
+static int fsl8250_acpi_probe(struct platform_device *pdev)
+{
+ struct fsl8250_data *data;
+ struct uart_8250_port port8250;
+ struct device *dev = &pdev->dev;
+ struct resource *regs;
+
+ int ret, irq;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_err(dev, "no registers defined\n");
+ return -EINVAL;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ if (irq != -EPROBE_DEFER)
+ dev_err(dev, "cannot get irq\n");
+ return irq;
+ }
+
+ memset(&port8250, 0, sizeof(port8250));
+
+ ret = device_property_read_u32(dev, "clock-frequency",
+ &port8250.port.uartclk);
+ if (ret)
+ return ret;
+
+ spin_lock_init(&port8250.port.lock);
+
+ port8250.port.mapbase = regs->start;
+ port8250.port.irq = irq;
+ port8250.port.handle_irq = fsl8250_handle_irq;
+ port8250.port.type = PORT_16550A;
+ port8250.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF
+ | UPF_FIXED_PORT | UPF_IOREMAP
+ | UPF_FIXED_TYPE;
+ port8250.port.dev = dev;
+ port8250.port.mapsize = resource_size(regs);
+ port8250.port.iotype = UPIO_MEM;
+ port8250.port.irqflags = IRQF_SHARED;
+
+ port8250.port.membase = devm_ioremap(dev, port8250.port.mapbase,
+ port8250.port.mapsize);
+ if (!port8250.port.membase)
+ return -ENOMEM;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->line = serial8250_register_8250_port(&port8250);
+ if (data->line < 0)
+ ret = data->line;
+
+ platform_set_drvdata(pdev, data);
+ return 0;
+}
+
+static int fsl8250_acpi_remove(struct platform_device *pdev)
+{
+ struct fsl8250_data *data = platform_get_drvdata(pdev);
+
+ serial8250_unregister_port(data->line);
+ return 0;
+}
+
+static const struct acpi_device_id fsl8250_acpi_match[] = {
+ { "NXP0018", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, fsl8250_acpi_match);
+
+static struct platform_driver fsl8250_platform_driver = {
+ .driver = {
+ .name = "fsl-16550-uart",
+ .acpi_match_table = ACPI_PTR(fsl8250_acpi_match),
+ },
+ .probe = fsl8250_acpi_probe,
+ .remove = fsl8250_acpi_remove,
+};
+
+module_platform_driver(fsl8250_platform_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("FSL 8250 serial port driver");
+MODULE_ALIAS("platform:" DRIVER_NAME);
This adds support for ACPI enumerated FSL 16550 UARTs. Signed-off-by: kuldip dwivedi <kuldip.dwivedi@puresoftware.com> --- drivers/tty/serial/8250/8250_fsl.c | 147 +++++++++++++++++++++++++---- 1 file changed, 131 insertions(+), 16 deletions(-)