add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/drivers/tty/serial/amba-pl011.c
..
..
@@ -16,11 +16,6 @@
16
16
  * and hooked into this driver.
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17
  */
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18
 
19
-
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-#if defined(CONFIG_SERIAL_AMBA_PL011_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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-#define SUPPORT_SYSRQ
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-#endif
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-
24
19
 #include <linux/module.h>
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20
 #include <linux/ioport.h>
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21
 #include <linux/init.h>
..
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@@ -417,7 +412,7 @@
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412
 	dma_cap_mask_t mask;
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413
 
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 	uap->dma_probed = true;
420
-	chan = dma_request_slave_channel_reason(dev, "tx");
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+	chan = dma_request_chan(dev, "tx");
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 	if (IS_ERR(chan)) {
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 		if (PTR_ERR(chan) == -EPROBE_DEFER) {
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 			uap->dma_probed = false;
..
..
@@ -1237,10 +1232,6 @@
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1232
 
1238
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 #else
1239
1234
 /* Blank functions if the DMA engine is not available */
1240
-static inline void pl011_dma_probe(struct uart_amba_port *uap)
1241
-{
1242
-}
1243
-
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1235
 static inline void pl011_dma_remove(struct uart_amba_port *uap)
1245
1236
 {
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1237
 }
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@@ -1333,6 +1324,15 @@
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1324
 	pl011_write(uap->im, uap, REG_IMSC);
1334
1325
 
1335
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 	pl011_dma_rx_stop(uap);
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+}
1328
+
1329
+static void pl011_throttle_rx(struct uart_port *port)
1330
+{
1331
+	unsigned long flags;
1332
+
1333
+	spin_lock_irqsave(&port->lock, flags);
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+	pl011_stop_rx(port);
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+	spin_unlock_irqrestore(&port->lock, flags);
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1336
 }
1337
1337
 
1338
1338
 static void pl011_enable_ms(struct uart_port *port)
..
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@@ -1459,8 +1459,6 @@
1459
1459
 
1460
1460
 static void check_apply_cts_event_workaround(struct uart_amba_port *uap)
1461
1461
 {
1462
-	unsigned int dummy_read;
1463
-
1464
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 	if (!uap->vendor->cts_event_workaround)
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 		return;
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1464
 
..
..
@@ -1472,8 +1470,8 @@
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 	 * single apb access will incur 2 pclk(133.12Mhz) delay,
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 	 * so add 2 dummy reads
1474
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 	 */
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-	dummy_read = pl011_read(uap, REG_ICR);
1476
-	dummy_read = pl011_read(uap, REG_ICR);
1473
+	pl011_read(uap, REG_ICR);
1474
+	pl011_read(uap, REG_ICR);
1477
1475
 }
1478
1476
 
1479
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 static irqreturn_t pl011_int(int irq, void *dev_id)
..
..
@@ -1718,7 +1716,7 @@
1718
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 {
1719
1717
 	pl011_write(uap->im, uap, REG_IMSC);
1720
1718
 
1721
-	return request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap);
1719
+	return request_irq(uap->port.irq, pl011_int, IRQF_SHARED, "uart-pl011", uap);
1722
1720
 }
1723
1721
 
1724
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 /*
..
..
@@ -1728,9 +1726,10 @@
1728
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  */
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 static void pl011_enable_interrupts(struct uart_amba_port *uap)
1730
1728
 {
1729
+	unsigned long flags;
1731
1730
 	unsigned int i;
1732
1731
 
1733
-	spin_lock_irq(&uap->port.lock);
1732
+	spin_lock_irqsave(&uap->port.lock, flags);
1734
1733
 
1735
1734
 	/* Clear out any spuriously appearing RX interrupts */
1736
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 	pl011_write(UART011_RTIS | UART011_RXIS, uap, REG_ICR);
..
..
@@ -1752,7 +1751,14 @@
1752
1751
 	if (!pl011_dma_rx_running(uap))
1753
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 		uap->im |= UART011_RXIM;
1754
1753
 	pl011_write(uap->im, uap, REG_IMSC);
1755
-	spin_unlock_irq(&uap->port.lock);
1754
+	spin_unlock_irqrestore(&uap->port.lock, flags);
1755
+}
1756
+
1757
+static void pl011_unthrottle_rx(struct uart_port *port)
1758
+{
1759
+	struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
1760
+
1761
+	pl011_enable_interrupts(uap);
1756
1762
 }
1757
1763
 
1758
1764
 static int pl011_startup(struct uart_port *port)
..
..
@@ -2127,6 +2133,8 @@
2127
2133
 	.stop_tx	= pl011_stop_tx,
2128
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 	.start_tx	= pl011_start_tx,
2129
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 	.stop_rx	= pl011_stop_rx,
2136
+	.throttle	= pl011_throttle_rx,
2137
+	.unthrottle	= pl011_unthrottle_rx,
2130
2138
 	.enable_ms	= pl011_enable_ms,
2131
2139
 	.break_ctl	= pl011_break_ctl,
2132
2140
 	.startup	= pl011_startup,
..
..
@@ -2432,6 +2440,37 @@
2432
2440
 	uart_console_write(&dev->port, s, n, pl011_putc);
2433
2441
 }
2434
2442
 
2443
+#ifdef CONFIG_CONSOLE_POLL
2444
+static int pl011_getc(struct uart_port *port)
2445
+{
2446
+	if (readl(port->membase + UART01x_FR) & UART01x_FR_RXFE)
2447
+		return NO_POLL_CHAR;
2448
+
2449
+	if (port->iotype == UPIO_MEM32)
2450
+		return readl(port->membase + UART01x_DR);
2451
+	else
2452
+		return readb(port->membase + UART01x_DR);
2453
+}
2454
+
2455
+static int pl011_early_read(struct console *con, char *s, unsigned int n)
2456
+{
2457
+	struct earlycon_device *dev = con->data;
2458
+	int ch, num_read = 0;
2459
+
2460
+	while (num_read < n) {
2461
+		ch = pl011_getc(&dev->port);
2462
+		if (ch == NO_POLL_CHAR)
2463
+			break;
2464
+
2465
+		s[num_read++] = ch;
2466
+	}
2467
+
2468
+	return num_read;
2469
+}
2470
+#else
2471
+#define pl011_early_read NULL
2472
+#endif
2473
+
2435
2474
 /*
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2475
  * On non-ACPI systems, earlycon is enabled by specifying
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2476
  * "earlycon=pl011,<address>" on the kernel command line.
..
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@@ -2451,6 +2490,7 @@
2451
2490
 		return -ENODEV;
2452
2491
 
2453
2492
 	device->con->write = pl011_early_write;
2493
+	device->con->read = pl011_early_read;
2454
2494
 
2455
2495
 	return 0;
2456
2496
 }
..
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@@ -2569,9 +2609,9 @@
2569
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 	uap->port.mapbase = mmiobase->start;
2570
2610
 	uap->port.membase = base;
2571
2611
 	uap->port.fifosize = uap->fifosize;
2612
+	uap->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_AMBA_PL011_CONSOLE);
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2613
 	uap->port.flags = UPF_BOOT_AUTOCONF;
2573
2614
 	uap->port.line = index;
2574
-	spin_lock_init(&uap->port.lock);
2575
2615
 
2576
2616
 	amba_ports[index] = uap;
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2617
 
..
..
@@ -2642,13 +2682,12 @@
2642
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 	return pl011_register_port(uap);
2643
2683
 }
2644
2684
 
2645
-static int pl011_remove(struct amba_device *dev)
2685
+static void pl011_remove(struct amba_device *dev)
2646
2686
 {
2647
2687
 	struct uart_amba_port *uap = amba_get_drvdata(dev);
2648
2688
 
2649
2689
 	uart_remove_one_port(&amba_reg, &uap->port);
2650
2690
 	pl011_unregister_port(uap);
2651
-	return 0;
2652
2691
 }
2653
2692
 
2654
2693
 #ifdef CONFIG_PM_SLEEP
..
..
@@ -2706,11 +2745,8 @@
2706
2745
 		return -ENOMEM;
2707
2746
 
2708
2747
 	ret = platform_get_irq(pdev, 0);
2709
-	if (ret < 0) {
2710
-		if (ret != -EPROBE_DEFER)
2711
-			dev_err(&pdev->dev, "cannot obtain irq\n");
2748
+	if (ret < 0)
2712
2749
 		return ret;
2713
-	}
2714
2750
 	uap->port.irq	= ret;
2715
2751
 
2716
2752
 #ifdef CONFIG_ACPI_SPCR_TABLE
..
..
@@ -2767,6 +2803,7 @@
2767
2803
 	.remove		= sbsa_uart_remove,
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2804
 	.driver	= {
2769
2805
 		.name	= "sbsa-uart",
2806
+		.pm	= &pl011_dev_pm_ops,
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2807
 		.of_match_table = of_match_ptr(sbsa_uart_of_match),
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2808
 		.acpi_match_table = ACPI_PTR(sbsa_uart_acpi_match),
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2809
 		.suppress_bind_attrs = IS_BUILTIN(CONFIG_SERIAL_AMBA_PL011),