rtl88x2CE_WiFi_linux driver

hc

2024-05-10 cde9070d9970eef1f7ec2360586c802a16230ad8

 kernel/drivers/tty/serial/8250/8250_aspeed_vuart.c
..
..
@@ -10,6 +10,8 @@
10
10
 #include <linux/of_address.h>
11
11
 #include <linux/of_irq.h>
12
12
 #include <linux/of_platform.h>
13
+#include <linux/regmap.h>
14
+#include <linux/mfd/syscon.h>
13
15
 #include <linux/tty.h>
14
16
 #include <linux/tty_flip.h>
15
17
 #include <linux/clk.h>
..
..
@@ -18,6 +20,7 @@
18
20
 
19
21
 #define ASPEED_VUART_GCRA		0x20
20
22
 #define ASPEED_VUART_GCRA_VUART_EN		BIT(0)
23
+#define ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY	BIT(1)
21
24
 #define ASPEED_VUART_GCRA_DISABLE_HOST_TX_DISCARD BIT(5)
22
25
 #define ASPEED_VUART_GCRB		0x24
23
26
 #define ASPEED_VUART_GCRB_HOST_SIRQ_MASK	GENMASK(7, 4)
..
..
@@ -127,8 +130,53 @@
127
130
 
128
131
 static DEVICE_ATTR_RW(sirq);
129
132
 
133
+static ssize_t sirq_polarity_show(struct device *dev,
134
+				  struct device_attribute *attr, char *buf)
135
+{
136
+	struct aspeed_vuart *vuart = dev_get_drvdata(dev);
137
+	u8 reg;
138
+
139
+	reg = readb(vuart->regs + ASPEED_VUART_GCRA);
140
+	reg &= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
141
+
142
+	return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg ? 1 : 0);
143
+}
144
+
145
+static void aspeed_vuart_set_sirq_polarity(struct aspeed_vuart *vuart,
146
+					   bool polarity)
147
+{
148
+	u8 reg = readb(vuart->regs + ASPEED_VUART_GCRA);
149
+
150
+	if (polarity)
151
+		reg |= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
152
+	else
153
+		reg &= ~ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
154
+
155
+	writeb(reg, vuart->regs + ASPEED_VUART_GCRA);
156
+}
157
+
158
+static ssize_t sirq_polarity_store(struct device *dev,
159
+				   struct device_attribute *attr,
160
+				   const char *buf, size_t count)
161
+{
162
+	struct aspeed_vuart *vuart = dev_get_drvdata(dev);
163
+	unsigned long val;
164
+	int err;
165
+
166
+	err = kstrtoul(buf, 0, &val);
167
+	if (err)
168
+		return err;
169
+
170
+	aspeed_vuart_set_sirq_polarity(vuart, val != 0);
171
+
172
+	return count;
173
+}
174
+
175
+static DEVICE_ATTR_RW(sirq_polarity);
176
+
130
177
 static struct attribute *aspeed_vuart_attrs[] = {
131
178
 	&dev_attr_sirq.attr,
179
+	&dev_attr_sirq_polarity.attr,
132
180
 	&dev_attr_lpc_address.attr,
133
181
 	NULL,
134
182
 };
..
..
@@ -293,13 +341,35 @@
293
341
 	if (lsr & UART_LSR_THRE)
294
342
 		serial8250_tx_chars(up);
295
343
 
296
-	spin_unlock_irqrestore(&port->lock, flags);
344
+	uart_unlock_and_check_sysrq(port, flags);
297
345
 
298
346
 	return 1;
299
347
 }
300
348
 
349
+static void aspeed_vuart_auto_configure_sirq_polarity(
350
+	struct aspeed_vuart *vuart, struct device_node *syscon_np,
351
+	u32 reg_offset, u32 reg_mask)
352
+{
353
+	struct regmap *regmap;
354
+	u32 value;
355
+
356
+	regmap = syscon_node_to_regmap(syscon_np);
357
+	if (IS_ERR(regmap)) {
358
+		dev_warn(vuart->dev,
359
+			 "could not get regmap for aspeed,sirq-polarity-sense\n");
360
+		return;
361
+	}
362
+	if (regmap_read(regmap, reg_offset, &value)) {
363
+		dev_warn(vuart->dev, "could not read hw strap table\n");
364
+		return;
365
+	}
366
+
367
+	aspeed_vuart_set_sirq_polarity(vuart, (value & reg_mask) == 0);
368
+}
369
+
301
370
 static int aspeed_vuart_probe(struct platform_device *pdev)
302
371
 {
372
+	struct of_phandle_args sirq_polarity_sense_args;
303
373
 	struct uart_8250_port port;
304
374
 	struct aspeed_vuart *vuart;
305
375
 	struct device_node *np;
..
..
@@ -332,6 +402,8 @@
332
402
 	port.port.unthrottle = aspeed_vuart_unthrottle;
333
403
 	port.port.status = UPSTAT_SYNC_FIFO;
334
404
 	port.port.dev = &pdev->dev;
405
+	port.port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
406
+	port.bugs |= UART_BUG_TXRACE;
335
407
 
336
408
 	rc = sysfs_create_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
337
409
 	if (rc < 0)
..
..
@@ -397,6 +469,20 @@
397
469
 
398
470
 	vuart->line = rc;
399
471
 
472
+	rc = of_parse_phandle_with_fixed_args(
473
+		np, "aspeed,sirq-polarity-sense", 2, 0,
474
+		&sirq_polarity_sense_args);
475
+	if (rc < 0) {
476
+		dev_dbg(&pdev->dev,
477
+			"aspeed,sirq-polarity-sense property not found\n");
478
+	} else {
479
+		aspeed_vuart_auto_configure_sirq_polarity(
480
+			vuart, sirq_polarity_sense_args.np,
481
+			sirq_polarity_sense_args.args[0],
482
+			BIT(sirq_polarity_sense_args.args[1]));
483
+		of_node_put(sirq_polarity_sense_args.np);
484
+	}
485
+
400
486
 	aspeed_vuart_set_enabled(vuart, true);
401
487
 	aspeed_vuart_set_host_tx_discard(vuart, true);
402
488
 	platform_set_drvdata(pdev, vuart);