change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/drivers/tty/serial/8250/8250_fsl.c
..
..
@@ -1,15 +1,12 @@
1
1
 // SPDX-License-Identifier: GPL-2.0
2
-#include <linux/serial_reg.h>
3
-#include <linux/serial_8250.h>
4
-
5
-#include "8250.h"
6
-
7
2
 /*
8
3
  * Freescale 16550 UART "driver", Copyright (C) 2011 Paul Gortmaker.
4
+ * Copyright 2020 NXP
5
+ * Copyright 2020 Puresoftware Ltd.
9
6
  *
10
7
  * This isn't a full driver; it just provides an alternate IRQ
11
- * handler to deal with an errata.  Everything else is just
12
- * using the bog standard 8250 support.
8
+ * handler to deal with an errata and provide ACPI wrapper.
9
+ * Everything else is just using the bog standard 8250 support.
13
10
  *
14
11
  * We follow code flow of serial8250_default_handle_irq() but add
15
12
  * a check for a break and insert a dummy read on the Rx for the
..
..
@@ -19,6 +16,16 @@
19
16
  * field to carry the "what we just did" information from the one
20
17
  * IRQ event to the next one.
21
18
  */
19
+
20
+#include <linux/acpi.h>
21
+#include <linux/serial_reg.h>
22
+#include <linux/serial_8250.h>
23
+
24
+#include "8250.h"
25
+
26
+struct fsl8250_data {
27
+	int	line;
28
+};
22
29
 
23
30
 int fsl8250_handle_irq(struct uart_port *port)
24
31
 {
..
..
@@ -71,11 +78,98 @@
71
78
 
72
79
 	serial8250_modem_status(up);
73
80
 
74
-	if (lsr & UART_LSR_THRE)
81
+	if ((lsr & UART_LSR_THRE) && (up->ier & UART_IER_THRI))
75
82
 		serial8250_tx_chars(up);
76
83
 
77
84
 	up->lsr_saved_flags = orig_lsr;
78
-	spin_unlock_irqrestore(&up->port.lock, flags);
85
+	uart_unlock_and_check_sysrq(&up->port, flags);
79
86
 	return 1;
80
87
 }
81
88
 EXPORT_SYMBOL_GPL(fsl8250_handle_irq);
89
+
90
+#ifdef CONFIG_ACPI
91
+static int fsl8250_acpi_probe(struct platform_device *pdev)
92
+{
93
+	struct fsl8250_data *data;
94
+	struct uart_8250_port port8250;
95
+	struct device *dev = &pdev->dev;
96
+	struct resource *regs;
97
+
98
+	int ret, irq;
99
+
100
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101
+	if (!regs) {
102
+		dev_err(dev, "no registers defined\n");
103
+		return -EINVAL;
104
+	}
105
+
106
+	irq = platform_get_irq(pdev, 0);
107
+	if (irq < 0) {
108
+		if (irq != -EPROBE_DEFER)
109
+			dev_err(dev, "cannot get irq\n");
110
+		return irq;
111
+	}
112
+
113
+	memset(&port8250, 0, sizeof(port8250));
114
+
115
+	ret = device_property_read_u32(dev, "clock-frequency",
116
+					&port8250.port.uartclk);
117
+	if (ret)
118
+		return ret;
119
+
120
+	spin_lock_init(&port8250.port.lock);
121
+
122
+	port8250.port.mapbase           = regs->start;
123
+	port8250.port.irq               = irq;
124
+	port8250.port.handle_irq        = fsl8250_handle_irq;
125
+	port8250.port.type              = PORT_16550A;
126
+	port8250.port.flags             = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF
127
+						| UPF_FIXED_PORT | UPF_IOREMAP
128
+						| UPF_FIXED_TYPE;
129
+	port8250.port.dev               = dev;
130
+	port8250.port.mapsize           = resource_size(regs);
131
+	port8250.port.iotype            = UPIO_MEM;
132
+	port8250.port.irqflags          = IRQF_SHARED;
133
+
134
+	port8250.port.membase = devm_ioremap(dev,  port8250.port.mapbase,
135
+							port8250.port.mapsize);
136
+	if (!port8250.port.membase)
137
+		return -ENOMEM;
138
+
139
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
140
+	if (!data)
141
+		return -ENOMEM;
142
+
143
+	data->line = serial8250_register_8250_port(&port8250);
144
+	if (data->line < 0)
145
+		return data->line;
146
+
147
+	platform_set_drvdata(pdev, data);
148
+	return 0;
149
+}
150
+
151
+static int fsl8250_acpi_remove(struct platform_device *pdev)
152
+{
153
+	struct fsl8250_data *data = platform_get_drvdata(pdev);
154
+
155
+	serial8250_unregister_port(data->line);
156
+	return 0;
157
+}
158
+
159
+static const struct acpi_device_id fsl_8250_acpi_id[] = {
160
+	{ "NXP0018", 0 },
161
+	{ },
162
+};
163
+MODULE_DEVICE_TABLE(acpi, fsl_8250_acpi_id);
164
+
165
+static struct platform_driver fsl8250_platform_driver = {
166
+	.driver = {
167
+		.name			= "fsl-16550-uart",
168
+		.acpi_match_table	= ACPI_PTR(fsl_8250_acpi_id),
169
+	},
170
+	.probe			= fsl8250_acpi_probe,
171
+	.remove			= fsl8250_acpi_remove,
172
+};
173
+
174
+module_platform_driver(fsl8250_platform_driver);
175
+#endif