[POWERPC] Add of_platform_bus support to mpc52xx psc uart driver (b9272dfd) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/serial/mpc52xx_uart.c

+337 −16

Original line number	Diff line number	Diff line
		@@ -16,7 +16,9 @@
		* Some of the code has been inspired/copied from the 2.4 code written
		* by Dale Farnsworth <dfarnsworth@mvista.com>.
		*
		* Copyright (C) 2004-2005 Sylvain Munaut <tnt@246tNt.com>
		* Copyright (C) 2006 Secret Lab Technologies Ltd.
		* Grant Likely <grant.likely@secretlab.ca>
		* Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
		* Copyright (C) 2003 MontaVista, Software, Inc.
		*
		* This file is licensed under the terms of the GNU General Public License
		@@ -42,7 +44,24 @@
		* will be mapped to.
		*/

		#include <linux/platform_device.h>
		/* OF Platform device Usage :
		*
		* This driver is only used for PSCs configured in uart mode. The device
		* tree will have a node for each PSC in uart mode w/ device_type = "serial"
		* and "mpc52xx-psc-uart" in the compatible string
		*
		* By default, PSC devices are enumerated in the order they are found. However
		* a particular PSC number can be forces by adding 'device_no = <port#>'
		* to the device node.
		*
		* The driver init all necessary registers to place the PSC in uart mode without
		* DCD. However, the pin multiplexing aren't changed and should be set either
		* by the bootloader or in the platform init code.
		*/

		#undef DEBUG

		#include <linux/device.h>
		#include <linux/module.h>
		#include <linux/tty.h>
		#include <linux/serial.h>
		@@ -52,6 +71,12 @@
		#include <asm/delay.h>
		#include <asm/io.h>

		#if defined(CONFIG_PPC_MERGE)
		#include <asm/of_platform.h>
		#else
		#include <linux/platform_device.h>
		#endif

		#include <asm/mpc52xx.h>
		#include <asm/mpc52xx_psc.h>

		@@ -78,6 +103,12 @@ static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
		* it's cleared, then a memset(...,0,...) should be added to
		* the console_init
		*/
		#if defined(CONFIG_PPC_MERGE)
		/* lookup table for matching device nodes to index numbers */
		static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];

		static void mpc52xx_uart_of_enumerate(void);
		#endif

		#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))

		@@ -94,6 +125,14 @@ static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id);
		#define uart_console(port) (0)
		#endif

		#if defined(CONFIG_PPC_MERGE)
		static struct of_device_id mpc52xx_uart_of_match[] = {
		{ .type = "serial", .compatible = "mpc52xx-psc-uart", },
		{ .type = "serial", .compatible = "mpc5200-psc", }, /* Efika only! */
		{},
		};
		#endif


		/* ======================================================================== */
		/* UART operations */
		@@ -330,7 +369,7 @@ mpc52xx_uart_release_port(struct uart_port *port)
		port->membase = NULL;
		}

		release_mem_region(port->mapbase, MPC52xx_PSC_SIZE);
		release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
		}

		static int
		@@ -339,12 +378,13 @@ mpc52xx_uart_request_port(struct uart_port *port)
		int err;

		if (port->flags & UPF_IOREMAP) /* Need to remap ? */
		port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
		port->membase = ioremap(port->mapbase,
		sizeof(struct mpc52xx_psc));

		if (!port->membase)
		return -EINVAL;

		err = request_mem_region(port->mapbase, MPC52xx_PSC_SIZE,
		err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
		"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;

		if (err && (port->flags & UPF_IOREMAP)) {
		@@ -561,13 +601,18 @@ mpc52xx_console_get_options(struct uart_port *port,
		struct mpc52xx_psc __iomem *psc = PSC(port);
		unsigned char mr1;

		pr_debug("mpc52xx_console_get_options(port=%p)\n", port);

		/* Read the mode registers */
		out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
		mr1 = in_8(&psc->mode);

		/* CT{U,L}R are write-only ! */
		*baud = __res.bi_baudrate ?
		__res.bi_baudrate : CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
		*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
		#if !defined(CONFIG_PPC_MERGE)
		if (__res.bi_baudrate)
		*baud = __res.bi_baudrate;
		#endif

		/* Parse them */
		switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
		@@ -620,6 +665,7 @@ mpc52xx_console_write(struct console co, const char s, unsigned int count)
		out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
		}

		#if !defined(CONFIG_PPC_MERGE)
		static int __init
		mpc52xx_console_setup(struct console co, char options)
		{
		@@ -654,6 +700,78 @@ mpc52xx_console_setup(struct console co, char options)
		return uart_set_options(port, co, baud, parity, bits, flow);
		}

		#else

		static int __init
		mpc52xx_console_setup(struct console co, char options)
		{
		struct uart_port *port = &mpc52xx_uart_ports[co->index];
		struct device_node *np = mpc52xx_uart_nodes[co->index];
		unsigned int ipb_freq;
		struct resource res;
		int ret;

		int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
		int bits = 8;
		int parity = 'n';
		int flow = 'n';

		pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
		co, co->index, options);

		if ((co->index < 0) \|\| (co->index > MPC52xx_PSC_MAXNUM)) {
		pr_debug("PSC%x out of range\n", co->index);
		return -EINVAL;
		}

		if (!np) {
		pr_debug("PSC%x not found in device tree\n", co->index);
		return -EINVAL;
		}

		pr_debug("Console on ttyPSC%x is %s\n",
		co->index, mpc52xx_uart_nodes[co->index]->full_name);

		/* Fetch register locations */
		if ((ret = of_address_to_resource(np, 0, &res)) != 0) {
		pr_debug("Could not get resources for PSC%x\n", co->index);
		return ret;
		}

		/* Search for bus-frequency property in this node or a parent */
		if ((ipb_freq = mpc52xx_find_ipb_freq(np)) == 0) {
		pr_debug("Could not find IPB bus frequency!\n");
		return -EINVAL;
		}

		/* Basic port init. Needed since we use some uart_??? func before
		* real init for early access */
		spin_lock_init(&port->lock);
		port->uartclk = ipb_freq / 2;
		port->ops = &mpc52xx_uart_ops;
		port->mapbase = res.start;
		port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
		port->irq = irq_of_parse_and_map(np, 0);

		if (port->membase == NULL)
		return -EINVAL;

		pr_debug("mpc52xx-psc uart at %lx, mapped to %p, irq=%x, freq=%i\n",
		port->mapbase, port->membase, port->irq, port->uartclk);

		/* Setup the port parameters accoding to options */
		if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
		else
		mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);

		pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
		baud, bits, parity, flow);

		return uart_set_options(port, co, baud, parity, bits, flow);
		}
		#endif /* defined(CONFIG_PPC_MERGE) */


		static struct uart_driver mpc52xx_uart_driver;

		@@ -671,6 +789,7 @@ static struct console mpc52xx_console = {
		static int __init
		mpc52xx_console_init(void)
		{
		mpc52xx_uart_of_enumerate();
		register_console(&mpc52xx_console);
		return 0;
		}
		@@ -698,6 +817,7 @@ static struct uart_driver mpc52xx_uart_driver = {
		};


		#if !defined(CONFIG_PPC_MERGE)
		/* ======================================================================== */
		/* Platform Driver */
		/* ======================================================================== */
		@@ -721,8 +841,6 @@ mpc52xx_uart_probe(struct platform_device *dev)
		/* Init the port structure */
		port = &mpc52xx_uart_ports[idx];

		memset(port, 0x00, sizeof(struct uart_port));

		spin_lock_init(&port->lock);
		port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
		port->fifosize = 512;
		@@ -731,6 +849,7 @@ mpc52xx_uart_probe(struct platform_device *dev)
		( uart_console(port) ? 0 : UPF_IOREMAP );
		port->line = idx;
		port->ops = &mpc52xx_uart_ops;
		port->dev = &dev->dev;

		/* Search for IRQ and mapbase */
		for (i=0 ; i<dev->num_resources ; i++, res++) {
		@@ -787,6 +906,7 @@ mpc52xx_uart_resume(struct platform_device *dev)
		}
		#endif


		static struct platform_driver mpc52xx_uart_platform_driver = {
		.probe = mpc52xx_uart_probe,
		.remove = mpc52xx_uart_remove,
		@@ -798,6 +918,184 @@ static struct platform_driver mpc52xx_uart_platform_driver = {
		.name = "mpc52xx-psc",
		},
		};
		#endif /* !defined(CONFIG_PPC_MERGE) */


		#if defined(CONFIG_PPC_MERGE)
		/* ======================================================================== */
		/* OF Platform Driver */
		/* ======================================================================== */

		static int __devinit
		mpc52xx_uart_of_probe(struct of_device op, const struct of_device_id match)
		{
		int idx = -1;
		unsigned int ipb_freq;
		struct uart_port *port = NULL;
		struct resource res;
		int ret;

		dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);

		/* Check validity & presence */
		for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
		if (mpc52xx_uart_nodes[idx] == op->node)
		break;
		if (idx >= MPC52xx_PSC_MAXNUM)
		return -EINVAL;
		pr_debug("Found %s assigned to ttyPSC%x\n",
		mpc52xx_uart_nodes[idx]->full_name, idx);

		/* Search for bus-frequency property in this node or a parent */
		if ((ipb_freq = mpc52xx_find_ipb_freq(op->node)) == 0) {
		dev_dbg(&op->dev, "Could not find IPB bus frequency!\n");
		return -EINVAL;
		}

		/* Init the port structure */
		port = &mpc52xx_uart_ports[idx];

		spin_lock_init(&port->lock);
		port->uartclk = ipb_freq / 2;
		port->fifosize = 512;
		port->iotype = UPIO_MEM;
		port->flags = UPF_BOOT_AUTOCONF \|
		( uart_console(port) ? 0 : UPF_IOREMAP );
		port->line = idx;
		port->ops = &mpc52xx_uart_ops;
		port->dev = &op->dev;

		/* Search for IRQ and mapbase */
		if ((ret = of_address_to_resource(op->node, 0, &res)) != 0)
		return ret;

		port->mapbase = res.start;
		port->irq = irq_of_parse_and_map(op->node, 0);

		dev_dbg(&op->dev, "mpc52xx-psc uart at %lx, irq=%x, freq=%i\n",
		port->mapbase, port->irq, port->uartclk);

		if ((port->irq==NO_IRQ) \|\| !port->mapbase) {
		printk(KERN_ERR "Could not allocate resources for PSC\n");
		return -EINVAL;
		}

		/* Add the port to the uart sub-system */
		ret = uart_add_one_port(&mpc52xx_uart_driver, port);
		if (!ret)
		dev_set_drvdata(&op->dev, (void*)port);

		return ret;
		}

		static int
		mpc52xx_uart_of_remove(struct of_device *op)
		{
		struct uart_port *port = dev_get_drvdata(&op->dev);
		dev_set_drvdata(&op->dev, NULL);

		if (port)
		uart_remove_one_port(&mpc52xx_uart_driver, port);

		return 0;
		}

		#ifdef CONFIG_PM
		static int
		mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
		{
		struct uart_port port = (struct uart_port ) dev_get_drvdata(&op->dev);

		if (port)
		uart_suspend_port(&mpc52xx_uart_driver, port);

		return 0;
		}

		static int
		mpc52xx_uart_of_resume(struct of_device *op)
		{
		struct uart_port port = (struct uart_port ) dev_get_drvdata(&op->dev);

		if (port)
		uart_resume_port(&mpc52xx_uart_driver, port);

		return 0;
		}
		#endif

		static void
		mpc52xx_uart_of_assign(struct device_node *np, int idx)
		{
		int free_idx = -1;
		int i;

		/* Find the first free node */
		for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
		if (mpc52xx_uart_nodes[i] == NULL) {
		free_idx = i;
		break;
		}
		}

		if ((idx < 0) \|\| (idx >= MPC52xx_PSC_MAXNUM))
		idx = free_idx;

		if (idx < 0)
		return; /* No free slot; abort */

		/* If the slot is already occupied, then swap slots */
		if (mpc52xx_uart_nodes[idx] && (free_idx != -1))
		mpc52xx_uart_nodes[free_idx] = mpc52xx_uart_nodes[idx];
		mpc52xx_uart_nodes[i] = np;
		}

		static void
		mpc52xx_uart_of_enumerate(void)
		{
		static int enum_done = 0;
		struct device_node *np;
		const unsigned int *devno;
		int i;

		if (enum_done)
		return;

		for_each_node_by_type(np, "serial") {
		if (!of_match_node(mpc52xx_uart_of_match, np))
		continue;

		/* Is a particular device number requested? */
		devno = get_property(np, "device_no", NULL);
		mpc52xx_uart_of_assign(of_node_get(np), devno ? *devno : -1);
		}

		enum_done = 1;

		for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
		if (mpc52xx_uart_nodes[i])
		pr_debug("%s assigned to ttyPSC%x\n",
		mpc52xx_uart_nodes[i]->full_name, i);
		}
		}

		MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);

		static struct of_platform_driver mpc52xx_uart_of_driver = {
		.owner = THIS_MODULE,
		.name = "mpc52xx-psc-uart",
		.match_table = mpc52xx_uart_of_match,
		.probe = mpc52xx_uart_of_probe,
		.remove = mpc52xx_uart_of_remove,
		#ifdef CONFIG_PM
		.suspend = mpc52xx_uart_of_suspend,
		.resume = mpc52xx_uart_of_resume,
		#endif
		.driver = {
		.name = "mpc52xx-psc-uart",
		},
		};
		#endif /* defined(CONFIG_PPC_MERGE) */


		/* ======================================================================== */
		@@ -809,22 +1107,45 @@ mpc52xx_uart_init(void)
		{
		int ret;

		printk(KERN_INFO "Serial: MPC52xx PSC driver\n");
		printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");

		if ((ret = uart_register_driver(&mpc52xx_uart_driver)) != 0) {
		printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
		__FILE__, ret);
		return ret;
		}

		#if defined(CONFIG_PPC_MERGE)
		mpc52xx_uart_of_enumerate();

		ret = uart_register_driver(&mpc52xx_uart_driver);
		if (ret == 0) {
		ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
		if (ret) {
		printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
		__FILE__, ret);
		uart_unregister_driver(&mpc52xx_uart_driver);
		return ret;
		}
		#else
		ret = platform_driver_register(&mpc52xx_uart_platform_driver);
		if (ret)
		if (ret) {
		printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
		__FILE__, ret);
		uart_unregister_driver(&mpc52xx_uart_driver);
		return ret;
		}
		#endif

		return ret;
		return 0;
		}

		static void __exit
		mpc52xx_uart_exit(void)
		{
		#if defined(CONFIG_PPC_MERGE)
		of_unregister_platform_driver(&mpc52xx_uart_of_driver);
		#else
		platform_driver_unregister(&mpc52xx_uart_platform_driver);
		#endif
		uart_unregister_driver(&mpc52xx_uart_driver);
		}