goldfish: tty driver (666b7793) · Commits · 戴 / test

drivers/tty/Kconfig

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -400,4 +400,10 @@ config PPC_EARLY_DEBUG_EHV_BC_HANDLE
	there simply will be no early console output. This is true also		there simply will be no early console output. This is true also
	if you don't boot under a hypervisor at all.		if you don't boot under a hypervisor at all.

			config GOLDFISH_TTY
			tristate "Goldfish TTY Driver"
			depends on GOLDFISH
			help
			Console and system TTY driver for the Goldfish virtual platform.

	endif # TTY		endif # TTY

drivers/tty/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -27,5 +27,6 @@ obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o
	obj-$(CONFIG_SYNCLINKMP) += synclinkmp.o		obj-$(CONFIG_SYNCLINKMP) += synclinkmp.o
	obj-$(CONFIG_SYNCLINK) += synclink.o		obj-$(CONFIG_SYNCLINK) += synclink.o
	obj-$(CONFIG_PPC_EPAPR_HV_BYTECHAN) += ehv_bytechan.o		obj-$(CONFIG_PPC_EPAPR_HV_BYTECHAN) += ehv_bytechan.o
			obj-$(CONFIG_GOLDFISH_TTY) += goldfish.o

	obj-y += ipwireless/		obj-y += ipwireless/

drivers/tty/goldfish.c

0 → 100644

+333 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Copyright (C) 2007 Google, Inc.
			* Copyright (C) 2012 Intel, Inc.
			*
			* This software is licensed under the terms of the GNU General Public
			* License version 2, as published by the Free Software Foundation, and
			* may be copied, distributed, and modified under those terms.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			*/

			#include <linux/console.h>
			#include <linux/init.h>
			#include <linux/interrupt.h>
			#include <linux/platform_device.h>
			#include <linux/tty.h>
			#include <linux/tty_flip.h>
			#include <linux/slab.h>
			#include <linux/io.h>
			#include <linux/module.h>

			enum {
			GOLDFISH_TTY_PUT_CHAR = 0x00,
			GOLDFISH_TTY_BYTES_READY = 0x04,
			GOLDFISH_TTY_CMD = 0x08,

			GOLDFISH_TTY_DATA_PTR = 0x10,
			GOLDFISH_TTY_DATA_LEN = 0x14,

			GOLDFISH_TTY_CMD_INT_DISABLE = 0,
			GOLDFISH_TTY_CMD_INT_ENABLE = 1,
			GOLDFISH_TTY_CMD_WRITE_BUFFER = 2,
			GOLDFISH_TTY_CMD_READ_BUFFER = 3,
			};

			struct goldfish_tty {
			struct tty_port port;
			spinlock_t lock;
			void __iomem *base;
			u32 irq;
			int opencount;
			struct console console;
			};

			static DEFINE_MUTEX(goldfish_tty_lock);
			static struct tty_driver *goldfish_tty_driver;
			static u32 goldfish_tty_line_count = 8;
			static u32 goldfish_tty_current_line_count;
			static struct goldfish_tty *goldfish_ttys;

			static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
			{
			unsigned long irq_flags;
			struct goldfish_tty *qtty = &goldfish_ttys[line];
			void __iomem *base = qtty->base;
			spin_lock_irqsave(&qtty->lock, irq_flags);
			writel((u32)buf, base + GOLDFISH_TTY_DATA_PTR);
			writel(count, base + GOLDFISH_TTY_DATA_LEN);
			writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
			spin_unlock_irqrestore(&qtty->lock, irq_flags);
			}

			static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
			{
			struct platform_device *pdev = dev_id;
			struct goldfish_tty *qtty = &goldfish_ttys[pdev->id];
			void __iomem *base = qtty->base;
			unsigned long irq_flags;
			unsigned char *buf;
			u32 count;
			struct tty_struct *tty;

			count = readl(base + GOLDFISH_TTY_BYTES_READY);
			if(count == 0)
			return IRQ_NONE;

			tty = tty_port_tty_get(&qtty->port);
			if (tty) {
			count = tty_prepare_flip_string(tty, &buf, count);
			spin_lock_irqsave(&qtty->lock, irq_flags);
			writel((u32)buf, base + GOLDFISH_TTY_DATA_PTR);
			writel(count, base + GOLDFISH_TTY_DATA_LEN);
			writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
			spin_unlock_irqrestore(&qtty->lock, irq_flags);
			tty_schedule_flip(tty);
			tty_kref_put(tty);
			}
			return IRQ_HANDLED;
			}

			static int goldfish_tty_activate(struct tty_port port, struct tty_struct tty)
			{
			struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, port);
			writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
			return 0;
			}

			static void goldfish_tty_shutdown(struct tty_port *port)
			{
			struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, port);
			writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
			}

			static int goldfish_tty_open(struct tty_struct * tty, struct file * filp)
			{
			struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
			return tty_port_open(&qtty->port, tty, filp);
			}

			static void goldfish_tty_close(struct tty_struct * tty, struct file * filp)
			{
			tty_port_close(tty->port, tty, filp);
			}

			static void goldfish_tty_hangup(struct tty_struct *tty)
			{
			tty_port_hangup(tty->port);
			}

			static int goldfish_tty_write(struct tty_struct * tty, const unsigned char *buf, int count)
			{
			goldfish_tty_do_write(tty->index, buf, count);
			return count;
			}

			static int goldfish_tty_write_room(struct tty_struct *tty)
			{
			return 0x10000;
			}

			static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
			{
			struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
			void __iomem *base = qtty->base;
			return readl(base + GOLDFISH_TTY_BYTES_READY);
			}

			static void goldfish_tty_console_write(struct console co, const char b, unsigned count)
			{
			goldfish_tty_do_write(co->index, b, count);
			}

			static struct tty_driver goldfish_tty_console_device(struct console c, int *index)
			{
			*index = c->index;
			return goldfish_tty_driver;
			}

			static int goldfish_tty_console_setup(struct console co, char options)
			{
			if((unsigned)co->index > goldfish_tty_line_count)
			return -ENODEV;
			if(goldfish_ttys[co->index].base == 0)
			return -ENODEV;
			return 0;
			}

			static struct tty_port_operations goldfish_port_ops = {
			.activate = goldfish_tty_activate,
			.shutdown = goldfish_tty_shutdown
			};

			static struct tty_operations goldfish_tty_ops = {
			.open = goldfish_tty_open,
			.close = goldfish_tty_close,
			.hangup = goldfish_tty_hangup,
			.write = goldfish_tty_write,
			.write_room = goldfish_tty_write_room,
			.chars_in_buffer = goldfish_tty_chars_in_buffer,
			};

			static int goldfish_tty_create_driver(void)
			{
			int ret;
			struct tty_driver *tty;

			goldfish_ttys = kzalloc(sizeof(goldfish_ttys) goldfish_tty_line_count, GFP_KERNEL);
			if(goldfish_ttys == NULL) {
			ret = -ENOMEM;
			goto err_alloc_goldfish_ttys_failed;
			}
			tty = alloc_tty_driver(goldfish_tty_line_count);
			if(tty == NULL) {
			ret = -ENOMEM;
			goto err_alloc_tty_driver_failed;
			}
			tty->driver_name = "goldfish";
			tty->name = "ttyGF";
			tty->type = TTY_DRIVER_TYPE_SERIAL;
			tty->subtype = SERIAL_TYPE_NORMAL;
			tty->init_termios = tty_std_termios;
			tty->flags = TTY_DRIVER_RESET_TERMIOS \| TTY_DRIVER_REAL_RAW \| TTY_DRIVER_DYNAMIC_DEV;
			tty_set_operations(tty, &goldfish_tty_ops);
			ret = tty_register_driver(tty);
			if(ret)
			goto err_tty_register_driver_failed;

			goldfish_tty_driver = tty;
			return 0;

			err_tty_register_driver_failed:
			put_tty_driver(tty);
			err_alloc_tty_driver_failed:
			kfree(goldfish_ttys);
			goldfish_ttys = NULL;
			err_alloc_goldfish_ttys_failed:
			return ret;
			}

			static void goldfish_tty_delete_driver(void)
			{
			tty_unregister_driver(goldfish_tty_driver);
			put_tty_driver(goldfish_tty_driver);
			goldfish_tty_driver = NULL;
			kfree(goldfish_ttys);
			goldfish_ttys = NULL;
			}

			static int goldfish_tty_probe(struct platform_device *pdev)
			{
			struct goldfish_tty *qtty;
			int ret = -EINVAL;
			int i;
			struct resource *r;
			struct device *ttydev;
			void __iomem *base;
			u32 irq;

			r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
			if(r == NULL)
			return -EINVAL;

			base = ioremap(r->start, 0x1000);
			if (base == NULL)
			pr_err("goldfish_tty: unable to remap base\n");

			r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
			if(r == NULL)
			goto err_unmap;

			irq = r->start;

			if(pdev->id >= goldfish_tty_line_count)
			goto err_unmap;

			mutex_lock(&goldfish_tty_lock);
			if(goldfish_tty_current_line_count == 0) {
			ret = goldfish_tty_create_driver();
			if(ret)
			goto err_create_driver_failed;
			}
			goldfish_tty_current_line_count++;

			qtty = &goldfish_ttys[pdev->id];
			spin_lock_init(&qtty->lock);
			tty_port_init(&qtty->port);
			qtty->port.ops = &goldfish_port_ops;
			qtty->base = base;
			qtty->irq = irq;

			writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);

			ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, "goldfish_tty", pdev);
			if(ret)
			goto err_request_irq_failed;


			ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
			pdev->id, &pdev->dev);
			if(IS_ERR(ttydev)) {
			ret = PTR_ERR(ttydev);
			goto err_tty_register_device_failed;
			}

			strcpy(qtty->console.name, "ttyGF");
			qtty->console.write = goldfish_tty_console_write;
			qtty->console.device = goldfish_tty_console_device;
			qtty->console.setup = goldfish_tty_console_setup;
			qtty->console.flags = CON_PRINTBUFFER;
			qtty->console.index = pdev->id;
			register_console(&qtty->console);

			mutex_unlock(&goldfish_tty_lock);
			return 0;

			tty_unregister_device(goldfish_tty_driver, i);
			err_tty_register_device_failed:
			free_irq(irq, pdev);
			err_request_irq_failed:
			goldfish_tty_current_line_count--;
			if(goldfish_tty_current_line_count == 0)
			goldfish_tty_delete_driver();
			err_create_driver_failed:
			mutex_unlock(&goldfish_tty_lock);
			err_unmap:
			iounmap(base);
			return ret;
			}

			static int goldfish_tty_remove(struct platform_device *pdev)
			{
			struct goldfish_tty *qtty;

			mutex_lock(&goldfish_tty_lock);

			qtty = &goldfish_ttys[pdev->id];
			unregister_console(&qtty->console);
			tty_unregister_device(goldfish_tty_driver, pdev->id);
			iounmap(qtty->base);
			qtty->base = 0;
			free_irq(qtty->irq, pdev);
			goldfish_tty_current_line_count--;
			if(goldfish_tty_current_line_count == 0)
			goldfish_tty_delete_driver();
			mutex_unlock(&goldfish_tty_lock);
			return 0;
			}

			static struct platform_driver goldfish_tty_platform_driver = {
			.probe = goldfish_tty_probe,
			.remove = goldfish_tty_remove,
			.driver = {
			.name = "goldfish_tty"
			}
			};

			module_platform_driver(goldfish_tty_platform_driver);

			MODULE_LICENSE("GPL v2");

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