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Message-ID: <1398265117-11793-13-git-send-email-balbi@ti.com>
Date: Wed, 23 Apr 2014 09:58:37 -0500
From: Felipe Balbi <balbi@...com>
To: Greg KH <gregkh@...uxfoundation.org>
CC: <marcel@...tmann.org>, <gustavo@...ovan.org>,
<johan.hedberg@...il.com>, <jslaby@...e.cz>,
<grant.likely@...aro.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
<linux-bluetooth@...r.kernel.org>, <linux-serial@...r.kernel.org>,
<devicetree@...r.kernel.org>,
Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>
Subject: [PATCH 13/13] serial: 8250: add OMAP glue
NOT COMPLETE
NYET-Signed-off-by: Felipe Balbi <balbi@...com>
---
drivers/tty/serial/8250/8250_omap.c | 233 ++++++++++++++++++++++++++++++++++++
drivers/tty/serial/8250/Kconfig | 7 ++
drivers/tty/serial/8250/Makefile | 1 +
3 files changed, 241 insertions(+)
create mode 100644 drivers/tty/serial/8250/8250_omap.c
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
new file mode 100644
index 0000000..e8ae479
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -0,0 +1,233 @@
+/*
+ * 8250-omap.c - OMAP adaptation for 8250 driver
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Felipe Balbi <balbi@...com>
+ *
+ * Based on omap-serial.c:
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * Authors:
+ * Govindraj R <govindraj.raja@...com>
+ * Thara Gopinath <thara@...com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Note: This driver is made separate from 8250 driver as we cannot
+ * over load 8250 driver with omap platform specific configuration for
+ * features like DMA, it makes easier to implement features like DMA and
+ * hardware flow control and software flow control configuration with
+ * this driver as required for the omap-platform.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_data/serial-omap.h>
+
+#include <dt-bindings/gpio/gpio.h>
+
+#define OMAP_MAX_HSUART_PORTS 6
+
+#define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
+
+#define OMAP_UART_REV_42 0x0402
+#define OMAP_UART_REV_46 0x0406
+#define OMAP_UART_REV_52 0x0502
+#define OMAP_UART_REV_63 0x0603
+
+#define OMAP_UART_TX_WAKEUP_EN BIT(7)
+
+/* Feature flags */
+#define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0)
+
+#define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
+#define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
+
+#define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
+
+/* SCR register bitmasks */
+#define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
+#define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6)
+#define OMAP_UART_SCR_TX_EMPTY (1 << 3)
+
+/* FCR register bitmasks */
+#define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
+#define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
+
+/* MVR register bitmasks */
+#define OMAP_UART_MVR_SCHEME_SHIFT 30
+
+#define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
+#define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
+#define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
+
+#define OMAP_UART_MVR_MAJ_MASK 0x700
+#define OMAP_UART_MVR_MAJ_SHIFT 8
+#define OMAP_UART_MVR_MIN_MASK 0x3f
+
+#define OMAP_UART_DMA_CH_FREE -1
+
+#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
+#define OMAP_MODE13X_SPEED 230400
+
+/* WER = 0x7F
+ * Enable module level wakeup in WER reg
+ */
+#define OMAP_UART_WER_MOD_WKUP 0X7F
+
+/* Enable XON/XOFF flow control on output */
+#define OMAP_UART_SW_TX 0x08
+
+/* Enable XON/XOFF flow control on input */
+#define OMAP_UART_SW_RX 0x02
+
+#define OMAP_UART_SW_CLR 0xF0
+
+#define OMAP_UART_TCR_TRIG 0x0F
+
+struct uart_omap_port {
+ struct uart_8250_port uart;
+ struct device *dev;
+ int wakeirq;
+
+ unsigned char ier;
+ unsigned char lcr;
+ unsigned char mcr;
+ unsigned char fcr;
+ unsigned char efr;
+ unsigned char dll;
+ unsigned char dlh;
+ unsigned char mdr1;
+ unsigned char scr;
+ unsigned char wer;
+
+ int line;
+
+ /*
+ * Some bits in registers are cleared on a read, so they must
+ * be saved whenever the register is read but the bits will not
+ * be immediately processed.
+ */
+ unsigned int lsr_break_flag;
+ unsigned char msr_saved_flags;
+ char name[20];
+ unsigned long port_activity;
+ int context_loss_cnt;
+ u32 errata;
+ u8 wakeups_enabled;
+ u32 features;
+};
+
+#define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
+
+static int serial_omap_probe(struct platform_device *pdev)
+{
+ struct uart_omap_port *up;
+ struct resource *mem;
+ void __iomem *base;
+ int uartirq = 0;
+ int ret;
+
+ if (!pdev->dev.of_node)
+ return -ENODEV;
+
+ uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (!uartirq)
+ return -EPROBE_DEFER;
+
+ up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
+ if (!up)
+ return -ENOMEM;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ up->dev = &pdev->dev;
+ up->uart.port.mapbase = mem->start;
+ up->uart.port.membase = base;
+ up->uart.port.irq = uartirq;
+ up->uart.port.dev = &pdev->dev;
+ up->uart.port.type = PORT_16750;
+ up->uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT;
+ up->uart.port.iotype = UPIO_MEM;
+
+ if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+ &up->uart.port.uartclk)) {
+ up->uart.port.uartclk = DEFAULT_CLK_SPEED;
+ dev_warn(&pdev->dev,
+ "No clock speed specified: using default: %d\n",
+ DEFAULT_CLK_SPEED);
+ }
+
+ platform_set_drvdata(pdev, up);
+
+ device_init_wakeup(up->dev, true);
+ pm_runtime_irq_safe(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ ret = serial8250_register_8250_port(&up->uart);
+ if (ret < 0)
+ goto err_add_port;
+
+ up->line = ret;
+
+ return 0;
+
+err_add_port:
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
+ pdev->id, __func__, ret);
+ return ret;
+}
+
+static int serial_omap_remove(struct platform_device *dev)
+{
+ struct uart_omap_port *up = platform_get_drvdata(dev);
+
+ serial8250_unregister_port(up->line);
+
+ pm_runtime_put_sync(up->dev);
+ pm_runtime_disable(up->dev);
+
+ return 0;
+}
+
+static const struct of_device_id omap_serial_of_match[] = {
+ { .compatible = "ti,am335x-uart" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, omap_serial_of_match);
+
+static struct platform_driver serial_omap_driver = {
+ .probe = serial_omap_probe,
+ .remove = serial_omap_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = of_match_ptr(omap_serial_of_match),
+ },
+};
+
+module_platform_driver(serial_omap_driver);
+
+MODULE_DESCRIPTION("OMAP High Speed UART driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Texas Instruments Incorporated");
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 2332991..ad092d5 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -287,6 +287,13 @@ config SERIAL_8250_DW
Selecting this option will enable handling of the extra features
present in the Synopsys DesignWare APB UART.
+config SERIAL_8250_OMAP
+ tristate "Support for OMAP 8250 quirks"
+ depends on SERIAL_8250
+ help
+ Selecting this option will enable handling of the extra features
+ present in the TI OMAP UART.
+
config SERIAL_8250_EM
tristate "Support for Emma Mobile integrated serial port"
depends on SERIAL_8250 && ARM && HAVE_CLK
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 36d68d0..0119a11 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -19,4 +19,5 @@ obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o
obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
+obj-$(CONFIG_SERIAL_8250_OMAP) += 8250_omap.o
obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o
--
1.9.2.459.g68773ac
--
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