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authorPeter Robinson <pbrobinson@gmail.com>2020-02-07 19:40:59 +0000
committerPeter Robinson <pbrobinson@gmail.com>2020-02-07 19:40:59 +0000
commitfa6c2bfdb071daa969287eca8afab834b481b774 (patch)
treeec13ff02fa3c9bbe096ddb08a7a0ca821a17d1fa
parentdde56757001fccedd29c70657b63693be65aa486 (diff)
downloadkernel-fa6c2bfdb071daa969287eca8afab834b481b774.tar.gz
kernel-fa6c2bfdb071daa969287eca8afab834b481b774.tar.xz
kernel-fa6c2bfdb071daa969287eca8afab834b481b774.zip
Add a tegra serial patch
-rw-r--r--arm64-serial-8250_tegra-Create-Tegra-specific-8250-driver.patch396
-rw-r--r--configs/fedora/generic/arm/CONFIG_SERIAL_8250_TEGRA1
-rw-r--r--kernel-aarch64-debug-fedora.config1
-rw-r--r--kernel-aarch64-fedora.config1
-rw-r--r--kernel-armv7hl-debug-fedora.config1
-rw-r--r--kernel-armv7hl-fedora.config1
-rw-r--r--kernel-armv7hl-lpae-debug-fedora.config1
-rw-r--r--kernel-armv7hl-lpae-fedora.config1
-rw-r--r--kernel.spec2
9 files changed, 405 insertions, 0 deletions
diff --git a/arm64-serial-8250_tegra-Create-Tegra-specific-8250-driver.patch b/arm64-serial-8250_tegra-Create-Tegra-specific-8250-driver.patch
new file mode 100644
index 000000000..8f9dd4473
--- /dev/null
+++ b/arm64-serial-8250_tegra-Create-Tegra-specific-8250-driver.patch
@@ -0,0 +1,396 @@
+From patchwork Wed Jan 29 13:28:17 2020
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+ id <B5e3188740004>; Wed, 29 Jan 2020 05:28:21 -0800
+From: Jon Hunter <jonathanh@nvidia.com>
+To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
+ Jiri Slaby <jslaby@suse.com>, Thierry Reding <thierry.reding@gmail.com>
+CC: <linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
+ <linux-tegra@vger.kernel.org>, Jeff Brasen <jbrasen@nvidia.com>,
+ Jon Hunter <jonathanh@nvidia.com>
+Subject: [PATCH V3] serial: 8250_tegra: Create Tegra specific 8250 driver
+Date: Wed, 29 Jan 2020 13:28:17 +0000
+Message-ID: <20200129132817.26343-1-jonathanh@nvidia.com>
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+
+From: Jeff Brasen <jbrasen@nvidia.com>
+
+To support booting NVIDIA Tegra platforms with either Device-Tree or
+ACPI, create a Tegra specific 8250 serial driver that supports both
+firmware types. Another benefit from doing this, is that the Tegra
+specific codec in the generic Open Firmware 8250 driver can now be
+removed.
+
+Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
+Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
+---
+
+Changes since V2:
+- Added missing header for devm_ioremap (reported by kbuild test robot)
+Changes since V1:
+- Added support for COMPILE_TEST
+
+ drivers/tty/serial/8250/8250_of.c | 28 ----
+ drivers/tty/serial/8250/8250_tegra.c | 198 +++++++++++++++++++++++++++
+ drivers/tty/serial/8250/Kconfig | 9 ++
+ drivers/tty/serial/8250/Makefile | 1 +
+ 4 files changed, 208 insertions(+), 28 deletions(-)
+ create mode 100644 drivers/tty/serial/8250/8250_tegra.c
+
+diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
+index 531ad67395e0..5e45cf8dbc6e 100644
+--- a/drivers/tty/serial/8250/8250_of.c
++++ b/drivers/tty/serial/8250/8250_of.c
+@@ -7,7 +7,6 @@
+ #include <linux/console.h>
+ #include <linux/module.h>
+ #include <linux/slab.h>
+-#include <linux/delay.h>
+ #include <linux/serial_core.h>
+ #include <linux/serial_reg.h>
+ #include <linux/of_address.h>
+@@ -26,28 +25,6 @@ struct of_serial_info {
+ int line;
+ };
+
+-#ifdef CONFIG_ARCH_TEGRA
+-static void tegra_serial_handle_break(struct uart_port *p)
+-{
+- unsigned int status, tmout = 10000;
+-
+- do {
+- status = p->serial_in(p, UART_LSR);
+- if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
+- status = p->serial_in(p, UART_RX);
+- else
+- break;
+- if (--tmout == 0)
+- break;
+- udelay(1);
+- } while (1);
+-}
+-#else
+-static inline void tegra_serial_handle_break(struct uart_port *port)
+-{
+-}
+-#endif
+-
+ static int of_8250_rs485_config(struct uart_port *port,
+ struct serial_rs485 *rs485)
+ {
+@@ -211,10 +188,6 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
+ port->rs485_config = of_8250_rs485_config;
+
+ switch (type) {
+- case PORT_TEGRA:
+- port->handle_break = tegra_serial_handle_break;
+- break;
+-
+ case PORT_RT2880:
+ port->iotype = UPIO_AU;
+ break;
+@@ -359,7 +332,6 @@ static const struct of_device_id of_platform_serial_table[] = {
+ { .compatible = "ns16550", .data = (void *)PORT_16550, },
+ { .compatible = "ns16750", .data = (void *)PORT_16750, },
+ { .compatible = "ns16850", .data = (void *)PORT_16850, },
+- { .compatible = "nvidia,tegra20-uart", .data = (void *)PORT_TEGRA, },
+ { .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
+ { .compatible = "ralink,rt2880-uart", .data = (void *)PORT_RT2880, },
+ { .compatible = "intel,xscale-uart", .data = (void *)PORT_XSCALE, },
+diff --git a/drivers/tty/serial/8250/8250_tegra.c b/drivers/tty/serial/8250/8250_tegra.c
+new file mode 100644
+index 000000000000..c0ffad1572c6
+--- /dev/null
++++ b/drivers/tty/serial/8250/8250_tegra.c
+@@ -0,0 +1,198 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * Serial Port driver for Tegra devices
++ *
++ * Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
++ */
++
++#include <linux/acpi.h>
++#include <linux/clk.h>
++#include <linux/console.h>
++#include <linux/delay.h>
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/reset.h>
++#include <linux/slab.h>
++
++#include "8250.h"
++
++struct tegra_uart {
++ struct clk *clk;
++ struct reset_control *rst;
++ int line;
++};
++
++static void tegra_uart_handle_break(struct uart_port *p)
++{
++ unsigned int status, tmout = 10000;
++
++ do {
++ status = p->serial_in(p, UART_LSR);
++ if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
++ status = p->serial_in(p, UART_RX);
++ else
++ break;
++ if (--tmout == 0)
++ break;
++ udelay(1);
++ } while (1);
++}
++
++static int tegra_uart_probe(struct platform_device *pdev)
++{
++ struct uart_8250_port port8250;
++ struct tegra_uart *uart;
++ struct uart_port *port;
++ struct resource *res;
++ int ret;
++
++ uart = devm_kzalloc(&pdev->dev, sizeof(*uart), GFP_KERNEL);
++ if (!uart)
++ return -ENOMEM;
++
++ memset(&port8250, 0, sizeof(port8250));
++
++ port = &port8250.port;
++ spin_lock_init(&port->lock);
++
++ port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT |
++ UPF_FIXED_TYPE;
++ port->iotype = UPIO_MEM32;
++ port->regshift = 2;
++ port->type = PORT_TEGRA;
++ port->irqflags |= IRQF_SHARED;
++ port->dev = &pdev->dev;
++ port->handle_break = tegra_uart_handle_break;
++
++ ret = of_alias_get_id(pdev->dev.of_node, "serial");
++ if (ret >= 0)
++ port->line = ret;
++
++ ret = platform_get_irq(pdev, 0);
++ if (ret < 0)
++ return ret;
++
++ port->irq = ret;
++
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (!res)
++ return -ENODEV;
++
++ port->membase = devm_ioremap(&pdev->dev, res->start,
++ resource_size(res));
++ if (!port->membase)
++ return -ENOMEM;
++
++ port->mapbase = res->start;
++ port->mapsize = resource_size(res);
++
++ uart->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
++ if (IS_ERR(uart->rst))
++ return PTR_ERR(uart->rst);
++
++ if (device_property_read_u32(&pdev->dev, "clock-frequency",
++ &port->uartclk)) {
++ uart->clk = devm_clk_get(&pdev->dev, NULL);
++ if (IS_ERR(uart->clk)) {
++ dev_err(&pdev->dev, "failed to get clock!\n");
++ return -ENODEV;
++ }
++
++ ret = clk_prepare_enable(uart->clk);
++ if (ret < 0)
++ return ret;
++
++ port->uartclk = clk_get_rate(uart->clk);
++ }
++
++ ret = reset_control_deassert(uart->rst);
++ if (ret)
++ goto err_clkdisable;
++
++ ret = serial8250_register_8250_port(&port8250);
++ if (ret < 0)
++ goto err_clkdisable;
++
++ platform_set_drvdata(pdev, uart);
++ uart->line = ret;
++
++ return 0;
++
++err_clkdisable:
++ clk_disable_unprepare(uart->clk);
++
++ return ret;
++}
++
++static int tegra_uart_remove(struct platform_device *pdev)
++{
++ struct tegra_uart *uart = platform_get_drvdata(pdev);
++
++ serial8250_unregister_port(uart->line);
++ reset_control_assert(uart->rst);
++ clk_disable_unprepare(uart->clk);
++
++ return 0;
++}
++
++#ifdef CONFIG_PM_SLEEP
++static int tegra_uart_suspend(struct device *dev)
++{
++ struct tegra_uart *uart = dev_get_drvdata(dev);
++ struct uart_8250_port *port8250 = serial8250_get_port(uart->line);
++ struct uart_port *port = &port8250->port;
++
++ serial8250_suspend_port(uart->line);
++
++ if (!uart_console(port) || console_suspend_enabled)
++ clk_disable_unprepare(uart->clk);
++
++ return 0;
++}
++
++static int tegra_uart_resume(struct device *dev)
++{
++ struct tegra_uart *uart = dev_get_drvdata(dev);
++ struct uart_8250_port *port8250 = serial8250_get_port(uart->line);
++ struct uart_port *port = &port8250->port;
++
++ if (!uart_console(port) || console_suspend_enabled)
++ clk_prepare_enable(uart->clk);
++
++ serial8250_resume_port(uart->line);
++
++ return 0;
++}
++#endif
++
++static SIMPLE_DEV_PM_OPS(tegra_uart_pm_ops, tegra_uart_suspend,
++ tegra_uart_resume);
++
++static const struct of_device_id tegra_uart_of_match[] = {
++ { .compatible = "nvidia,tegra20-uart", },
++ { },
++};
++MODULE_DEVICE_TABLE(of, tegra_uart_of_match);
++
++static const struct acpi_device_id tegra_uart_acpi_match[] = {
++ { "NVDA0100", 0 },
++ { },
++};
++MODULE_DEVICE_TABLE(acpi, tegra_uart_acpi_match);
++
++static struct platform_driver tegra_uart_driver = {
++ .driver = {
++ .name = "tegra-uart",
++ .pm = &tegra_uart_pm_ops,
++ .of_match_table = tegra_uart_of_match,
++ .acpi_match_table = ACPI_PTR(tegra_uart_acpi_match),
++ },
++ .probe = tegra_uart_probe,
++ .remove = tegra_uart_remove,
++};
++
++module_platform_driver(tegra_uart_driver);
++
++MODULE_AUTHOR("Jeff Brasen <jbrasen@nvidia.com>");
++MODULE_DESCRIPTION("NVIDIA Tegra 8250 Driver");
++MODULE_LICENSE("GPL v2");
+diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
+index f16824bbb573..af0688156dd0 100644
+--- a/drivers/tty/serial/8250/Kconfig
++++ b/drivers/tty/serial/8250/Kconfig
+@@ -500,6 +500,15 @@ config SERIAL_8250_PXA
+ applicable to both devicetree and legacy boards, and early console is
+ part of its support.
+
++config SERIAL_8250_TEGRA
++ tristate "8250 support for Tegra serial ports"
++ default SERIAL_8250
++ depends on SERIAL_8250
++ depends on ARCH_TEGRA || COMPILE_TEST
++ help
++ Select this option if you have machine with an NVIDIA Tegra SoC and
++ wish to enable 8250 serial driver for the Tegra serial interfaces.
++
+ config SERIAL_OF_PLATFORM
+ tristate "Devicetree based probing for 8250 ports"
+ depends on SERIAL_8250 && OF
+diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
+index 51a6079d3f1f..a8bfb654d490 100644
+--- a/drivers/tty/serial/8250/Makefile
++++ b/drivers/tty/serial/8250/Makefile
+@@ -37,6 +37,7 @@ obj-$(CONFIG_SERIAL_8250_INGENIC) += 8250_ingenic.o
+ obj-$(CONFIG_SERIAL_8250_LPSS) += 8250_lpss.o
+ obj-$(CONFIG_SERIAL_8250_MID) += 8250_mid.o
+ obj-$(CONFIG_SERIAL_8250_PXA) += 8250_pxa.o
++obj-$(CONFIG_SERIAL_8250_TEGRA) += 8250_tegra.o
+ obj-$(CONFIG_SERIAL_OF_PLATFORM) += 8250_of.o
+
+ CFLAGS_8250_ingenic.o += -I$(srctree)/scripts/dtc/libfdt
diff --git a/configs/fedora/generic/arm/CONFIG_SERIAL_8250_TEGRA b/configs/fedora/generic/arm/CONFIG_SERIAL_8250_TEGRA
new file mode 100644
index 000000000..b9ebe4268
--- /dev/null
+++ b/configs/fedora/generic/arm/CONFIG_SERIAL_8250_TEGRA
@@ -0,0 +1 @@
+CONFIG_SERIAL_8250_TEGRA=y
diff --git a/kernel-aarch64-debug-fedora.config b/kernel-aarch64-debug-fedora.config
index ac579429a..19ba4c97c 100644
--- a/kernel-aarch64-debug-fedora.config
+++ b/kernel-aarch64-debug-fedora.config
@@ -5735,6 +5735,7 @@ CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_RT288X=y
CONFIG_SERIAL_8250_RUNTIME_UARTS=32
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_TEGRA=y
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
diff --git a/kernel-aarch64-fedora.config b/kernel-aarch64-fedora.config
index 7d304e100..390d90e27 100644
--- a/kernel-aarch64-fedora.config
+++ b/kernel-aarch64-fedora.config
@@ -5714,6 +5714,7 @@ CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_RT288X=y
CONFIG_SERIAL_8250_RUNTIME_UARTS=32
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_TEGRA=y
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
diff --git a/kernel-armv7hl-debug-fedora.config b/kernel-armv7hl-debug-fedora.config
index ae22e5879..243a7fc02 100644
--- a/kernel-armv7hl-debug-fedora.config
+++ b/kernel-armv7hl-debug-fedora.config
@@ -5857,6 +5857,7 @@ CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_RT288X=y
CONFIG_SERIAL_8250_RUNTIME_UARTS=32
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_TEGRA=y
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
diff --git a/kernel-armv7hl-fedora.config b/kernel-armv7hl-fedora.config
index eccfc3461..94e356dbd 100644
--- a/kernel-armv7hl-fedora.config
+++ b/kernel-armv7hl-fedora.config
@@ -5837,6 +5837,7 @@ CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_RT288X=y
CONFIG_SERIAL_8250_RUNTIME_UARTS=32
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_TEGRA=y
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
diff --git a/kernel-armv7hl-lpae-debug-fedora.config b/kernel-armv7hl-lpae-debug-fedora.config
index 32b943d46..9c4dfcbe3 100644
--- a/kernel-armv7hl-lpae-debug-fedora.config
+++ b/kernel-armv7hl-lpae-debug-fedora.config
@@ -5670,6 +5670,7 @@ CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_RT288X=y
CONFIG_SERIAL_8250_RUNTIME_UARTS=32
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_TEGRA=y
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
diff --git a/kernel-armv7hl-lpae-fedora.config b/kernel-armv7hl-lpae-fedora.config
index 41c581b52..269adfad6 100644
--- a/kernel-armv7hl-lpae-fedora.config
+++ b/kernel-armv7hl-lpae-fedora.config
@@ -5650,6 +5650,7 @@ CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_RT288X=y
CONFIG_SERIAL_8250_RUNTIME_UARTS=32
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_TEGRA=y
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
diff --git a/kernel.spec b/kernel.spec
index d003a3939..a312a4056 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -834,6 +834,8 @@ Patch313: usb-xhci-Raspberry-Pi-FW-loader-for-VIA-VL805.patch
Patch320: arm64-tegra-jetson-tx1-fixes.patch
# https://www.spinics.net/lists/linux-tegra/msg43110.html
Patch321: arm64-tegra-Jetson-TX2-Allow-bootloader-to-configure.patch
+# http://patchwork.ozlabs.org/patch/1230891/
+Patch322: arm64-serial-8250_tegra-Create-Tegra-specific-8250-driver.patch
# 400 - IBM (ppc/s390x) patches