HSI: Introduce OMAP SSI driver (b209e047) · Commits · e / devices / android_kernel_teracube_2e

drivers/hsi/Kconfig

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Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@ config HSI_BOARDINFO
		bool
		default y

		source "drivers/hsi/controllers/Kconfig"
		source "drivers/hsi/clients/Kconfig"

		endif # HSI

drivers/hsi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -3,4 +3,5 @@
		#
		obj-$(CONFIG_HSI_BOARDINFO) += hsi_boardinfo.o
		obj-$(CONFIG_HSI) += hsi.o
		obj-y += controllers/
		obj-y += clients/

drivers/hsi/controllers/Kconfig

0 → 100644

+19 −0

Original line number	Diff line number	Diff line
		#
		# HSI controllers configuration
		#
		comment "HSI controllers"

		config OMAP_SSI
		tristate "OMAP SSI hardware driver"
		depends on HSI && OF && (ARCH_OMAP3 \|\| (ARM && COMPILE_TEST))
		---help---
		SSI is a legacy version of HSI. It is usually used to connect
		an application engine with a cellular modem.
		If you say Y here, you will enable the OMAP SSI hardware driver.

		If unsure, say N.

		config OMAP_SSI_PORT
		tristate
		default m if OMAP_SSI=m
		default y if OMAP_SSI=y

drivers/hsi/controllers/Makefile

0 → 100644

+6 −0

Original line number	Diff line number	Diff line
		#
		# Makefile for HSI controllers drivers
		#

		obj-$(CONFIG_OMAP_SSI) += omap_ssi.o
		obj-$(CONFIG_OMAP_SSI_PORT) += omap_ssi_port.o

drivers/hsi/controllers/omap_ssi.c

0 → 100644

+625 −0

Original line number	Diff line number	Diff line
		/* OMAP SSI driver.
		*
		* Copyright (C) 2010 Nokia Corporation. All rights reserved.
		* Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
		*
		* Contact: Carlos Chinea <carlos.chinea@nokia.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* version 2 as published by the Free Software Foundation.
		*
		* 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.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
		* 02110-1301 USA
		*/

		#include <linux/compiler.h>
		#include <linux/err.h>
		#include <linux/ioport.h>
		#include <linux/io.h>
		#include <linux/gpio.h>
		#include <linux/clk.h>
		#include <linux/device.h>
		#include <linux/platform_device.h>
		#include <linux/dma-mapping.h>
		#include <linux/dmaengine.h>
		#include <linux/delay.h>
		#include <linux/seq_file.h>
		#include <linux/scatterlist.h>
		#include <linux/interrupt.h>
		#include <linux/spinlock.h>
		#include <linux/debugfs.h>
		#include <linux/pm_runtime.h>
		#include <linux/of_platform.h>
		#include <linux/hsi/hsi.h>
		#include <linux/idr.h>

		#include "omap_ssi_regs.h"
		#include "omap_ssi.h"

		/* For automatically allocated device IDs */
		static DEFINE_IDA(platform_omap_ssi_ida);

		#ifdef CONFIG_DEBUG_FS
		static int ssi_debug_show(struct seq_file m, void p __maybe_unused)
		{
		struct hsi_controller *ssi = m->private;
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		void __iomem *sys = omap_ssi->sys;

		pm_runtime_get_sync(ssi->device.parent);
		seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG));
		seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG));
		seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG));
		pm_runtime_put_sync(ssi->device.parent);

		return 0;
		}

		static int ssi_debug_gdd_show(struct seq_file m, void p __maybe_unused)
		{
		struct hsi_controller *ssi = m->private;
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		void __iomem *gdd = omap_ssi->gdd;
		void __iomem *sys = omap_ssi->sys;
		int lch;

		pm_runtime_get_sync(ssi->device.parent);

		seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n",
		readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG));
		seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n",
		readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG));
		seq_printf(m, "HW_ID\t\t: 0x%08x\n",
		readl(gdd + SSI_GDD_HW_ID_REG));
		seq_printf(m, "PPORT_ID\t: 0x%08x\n",
		readl(gdd + SSI_GDD_PPORT_ID_REG));
		seq_printf(m, "MPORT_ID\t: 0x%08x\n",
		readl(gdd + SSI_GDD_MPORT_ID_REG));
		seq_printf(m, "TEST\t\t: 0x%08x\n",
		readl(gdd + SSI_GDD_TEST_REG));
		seq_printf(m, "GCR\t\t: 0x%08x\n",
		readl(gdd + SSI_GDD_GCR_REG));

		for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
		seq_printf(m, "\nGDD LCH %d\n=========\n", lch);
		seq_printf(m, "CSDP\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CSDP_REG(lch)));
		seq_printf(m, "CCR\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CCR_REG(lch)));
		seq_printf(m, "CICR\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CICR_REG(lch)));
		seq_printf(m, "CSR\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CSR_REG(lch)));
		seq_printf(m, "CSSA\t\t: 0x%08x\n",
		readl(gdd + SSI_GDD_CSSA_REG(lch)));
		seq_printf(m, "CDSA\t\t: 0x%08x\n",
		readl(gdd + SSI_GDD_CDSA_REG(lch)));
		seq_printf(m, "CEN\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CEN_REG(lch)));
		seq_printf(m, "CSAC\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CSAC_REG(lch)));
		seq_printf(m, "CDAC\t\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CDAC_REG(lch)));
		seq_printf(m, "CLNK_CTRL\t: 0x%04x\n",
		readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
		}

		pm_runtime_put_sync(ssi->device.parent);

		return 0;
		}

		static int ssi_regs_open(struct inode inode, struct file file)
		{
		return single_open(file, ssi_debug_show, inode->i_private);
		}

		static int ssi_gdd_regs_open(struct inode inode, struct file file)
		{
		return single_open(file, ssi_debug_gdd_show, inode->i_private);
		}

		static const struct file_operations ssi_regs_fops = {
		.open = ssi_regs_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = single_release,
		};

		static const struct file_operations ssi_gdd_regs_fops = {
		.open = ssi_gdd_regs_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = single_release,
		};

		static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		struct dentry *dir;

		/* SSI controller */
		omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
		if (IS_ERR(omap_ssi->dir))
		return PTR_ERR(omap_ssi->dir);

		debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi,
		&ssi_regs_fops);
		/* SSI GDD (DMA) */
		dir = debugfs_create_dir("gdd", omap_ssi->dir);
		if (IS_ERR(dir))
		goto rback;
		debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);

		return 0;
		rback:
		debugfs_remove_recursive(omap_ssi->dir);

		return PTR_ERR(dir);
		}

		static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);

		debugfs_remove_recursive(omap_ssi->dir);
		}
		#endif /* CONFIG_DEBUG_FS */

		/*
		* FIXME: Horrible HACK needed until we remove the useless wakeline test
		* in the CMT. To be removed !!!!
		*/
		void ssi_waketest(struct hsi_client *cl, unsigned int enable)
		{
		struct hsi_port *port = hsi_get_port(cl);
		struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
		struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);

		omap_port->wktest = !!enable;
		if (omap_port->wktest) {
		pm_runtime_get_sync(ssi->device.parent);
		writel_relaxed(SSI_WAKE(0),
		omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
		} else {
		writel_relaxed(SSI_WAKE(0),
		omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
		pm_runtime_put_sync(ssi->device.parent);
		}
		}
		EXPORT_SYMBOL_GPL(ssi_waketest);

		static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg;
		struct hsi_port *port = to_hsi_port(msg->cl->device.parent);
		struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
		unsigned int dir;
		u32 csr;
		u32 val;

		spin_lock(&omap_ssi->lock);

		val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
		val &= ~SSI_GDD_LCH(lch);
		writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);

		if (msg->ttype == HSI_MSG_READ) {
		dir = DMA_FROM_DEVICE;
		val = SSI_DATAAVAILABLE(msg->channel);
		pm_runtime_put_sync(ssi->device.parent);
		} else {
		dir = DMA_TO_DEVICE;
		val = SSI_DATAACCEPT(msg->channel);
		/* Keep clocks reference for write pio event */
		}
		dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir);
		csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch));
		omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */
		dev_dbg(&port->device, "DMA completed ch %d ttype %d\n",
		msg->channel, msg->ttype);
		spin_unlock(&omap_ssi->lock);
		if (csr & SSI_CSR_TOUR) { /* Timeout error */
		msg->status = HSI_STATUS_ERROR;
		msg->actual_len = 0;
		spin_lock(&omap_port->lock);
		list_del(&msg->link); /* Dequeue msg */
		spin_unlock(&omap_port->lock);
		msg->complete(msg);
		return;
		}
		spin_lock(&omap_port->lock);
		val \|= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
		writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
		spin_unlock(&omap_port->lock);

		msg->status = HSI_STATUS_COMPLETED;
		msg->actual_len = sg_dma_len(msg->sgt.sgl);
		}

		static void ssi_gdd_tasklet(unsigned long dev)
		{
		struct hsi_controller ssi = (struct hsi_controller )dev;
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		void __iomem *sys = omap_ssi->sys;
		unsigned int lch;
		u32 status_reg;

		pm_runtime_get_sync(ssi->device.parent);

		status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
		for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
		if (status_reg & SSI_GDD_LCH(lch))
		ssi_gdd_complete(ssi, lch);
		}
		writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
		status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);

		pm_runtime_put_sync(ssi->device.parent);

		if (status_reg)
		tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
		else
		enable_irq(omap_ssi->gdd_irq);

		}

		static irqreturn_t ssi_gdd_isr(int irq, void *ssi)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);

		tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
		disable_irq_nosync(irq);

		return IRQ_HANDLED;
		}

		static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		unsigned long rate = clk_get_rate(omap_ssi->fck);
		return rate;
		}

		static int __init ssi_get_iomem(struct platform_device *pd,
		const char name, void __iomem pbase, dma_addr_t phy)
		{
		struct resource *mem;
		struct resource *ioarea;
		void __iomem *base;
		struct hsi_controller *ssi = platform_get_drvdata(pd);

		mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name);
		if (!mem) {
		dev_err(&pd->dev, "IO memory region missing (%s)\n", name);
		return -ENXIO;
		}
		ioarea = devm_request_mem_region(&ssi->device, mem->start,
		resource_size(mem), dev_name(&pd->dev));
		if (!ioarea) {
		dev_err(&pd->dev, "%s IO memory region request failed\n",
		mem->name);
		return -ENXIO;
		}
		base = devm_ioremap(&ssi->device, mem->start, resource_size(mem));
		if (!base) {
		dev_err(&pd->dev, "%s IO remap failed\n", mem->name);
		return -ENXIO;
		}
		*pbase = base;

		if (phy)
		*phy = mem->start;

		return 0;
		}

		static int __init ssi_add_controller(struct hsi_controller *ssi,
		struct platform_device *pd)
		{
		struct omap_ssi_controller *omap_ssi;
		int err;

		omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL);
		if (!omap_ssi) {
		dev_err(&pd->dev, "not enough memory for omap ssi\n");
		return -ENOMEM;
		}

		ssi->id = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL);
		if (ssi->id < 0) {
		err = ssi->id;
		goto out_err;
		}

		ssi->owner = THIS_MODULE;
		ssi->device.parent = &pd->dev;
		dev_set_name(&ssi->device, "ssi%d", ssi->id);
		hsi_controller_set_drvdata(ssi, omap_ssi);
		omap_ssi->dev = &ssi->device;
		err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL);
		if (err < 0)
		goto out_err;
		err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL);
		if (err < 0)
		goto out_err;
		omap_ssi->gdd_irq = platform_get_irq_byname(pd, "gdd_mpu");
		if (omap_ssi->gdd_irq < 0) {
		dev_err(&pd->dev, "GDD IRQ resource missing\n");
		err = omap_ssi->gdd_irq;
		goto out_err;
		}
		tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet,
		(unsigned long)ssi);
		err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr,
		0, "gdd_mpu", ssi);
		if (err < 0) {
		dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)",
		omap_ssi->gdd_irq, err);
		goto out_err;
		}

		omap_ssi->port = devm_kzalloc(&ssi->device,
		sizeof(struct omap_ssi_port ) ssi->num_ports, GFP_KERNEL);
		if (!omap_ssi->port) {
		err = -ENOMEM;
		goto out_err;
		}

		omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck");
		if (IS_ERR(omap_ssi->fck)) {
		dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n",
		PTR_ERR(omap_ssi->fck));
		err = -ENODEV;
		goto out_err;
		}

		/* TODO: find register, which can be used to detect context loss */
		omap_ssi->get_loss = NULL;

		omap_ssi->max_speed = UINT_MAX;
		spin_lock_init(&omap_ssi->lock);
		err = hsi_register_controller(ssi);

		if (err < 0)
		goto out_err;

		return 0;

		out_err:
		ida_simple_remove(&platform_omap_ssi_ida, ssi->id);
		return err;
		}

		static int __init ssi_hw_init(struct hsi_controller *ssi)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		unsigned int i;
		u32 val;
		int err;

		err = pm_runtime_get_sync(ssi->device.parent);
		if (err < 0) {
		dev_err(&ssi->device, "runtime PM failed %d\n", err);
		return err;
		}
		/* Reseting SSI controller */
		writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG);
		val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
		for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) {
		msleep(20);
		val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
		}
		if (!(val & SSI_RESETDONE)) {
		dev_err(&ssi->device, "SSI HW reset failed\n");
		pm_runtime_put_sync(ssi->device.parent);
		return -EIO;
		}
		/* Reseting GDD */
		writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
		/* Get FCK rate in KHz */
		omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000);
		dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate);
		/* Set default PM settings */
		val = SSI_AUTOIDLE \| SSI_SIDLEMODE_SMART \| SSI_MIDLEMODE_SMART;
		writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG);
		omap_ssi->sysconfig = val;
		writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
		omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
		pm_runtime_put_sync(ssi->device.parent);

		return 0;
		}

		static void ssi_remove_controller(struct hsi_controller *ssi)
		{
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
		int id = ssi->id;
		tasklet_kill(&omap_ssi->gdd_tasklet);
		hsi_unregister_controller(ssi);
		ida_simple_remove(&platform_omap_ssi_ida, id);
		}

		static inline int ssi_of_get_available_ports_count(const struct device_node *np)
		{
		struct device_node *child;
		int num = 0;

		for_each_available_child_of_node(np, child)
		if (of_device_is_compatible(child, "ti,omap3-ssi-port"))
		num++;

		return num;
		}

		static int ssi_remove_ports(struct device dev, void c)
		{
		struct platform_device *pdev = to_platform_device(dev);

		of_device_unregister(pdev);

		return 0;
		}

		static int __init ssi_probe(struct platform_device *pd)
		{
		struct platform_device *childpdev;
		struct device_node *np = pd->dev.of_node;
		struct device_node *child;
		struct hsi_controller *ssi;
		int err;
		int num_ports;

		if (!np) {
		dev_err(&pd->dev, "missing device tree data\n");
		return -EINVAL;
		}

		num_ports = ssi_of_get_available_ports_count(np);

		ssi = hsi_alloc_controller(num_ports, GFP_KERNEL);
		if (!ssi) {
		dev_err(&pd->dev, "No memory for controller\n");
		return -ENOMEM;
		}

		platform_set_drvdata(pd, ssi);

		err = ssi_add_controller(ssi, pd);
		if (err < 0)
		goto out1;

		pm_runtime_irq_safe(&pd->dev);
		pm_runtime_enable(&pd->dev);

		err = ssi_hw_init(ssi);
		if (err < 0)
		goto out2;
		#ifdef CONFIG_DEBUG_FS
		err = ssi_debug_add_ctrl(ssi);
		if (err < 0)
		goto out2;
		#endif

		for_each_available_child_of_node(np, child) {
		if (!of_device_is_compatible(child, "ti,omap3-ssi-port"))
		continue;

		childpdev = of_platform_device_create(child, NULL, &pd->dev);
		if (!childpdev) {
		err = -ENODEV;
		dev_err(&pd->dev, "failed to create ssi controller port\n");
		goto out3;
		}
		}

		dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n",
		ssi->id, num_ports);
		return err;
		out3:
		device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
		out2:
		ssi_remove_controller(ssi);
		out1:
		platform_set_drvdata(pd, NULL);
		pm_runtime_disable(&pd->dev);

		return err;
		}

		static int __exit ssi_remove(struct platform_device *pd)
		{
		struct hsi_controller *ssi = platform_get_drvdata(pd);

		#ifdef CONFIG_DEBUG_FS
		ssi_debug_remove_ctrl(ssi);
		#endif
		ssi_remove_controller(ssi);
		platform_set_drvdata(pd, NULL);

		pm_runtime_disable(&pd->dev);

		/* cleanup of of_platform_populate() call */
		device_for_each_child(&pd->dev, NULL, ssi_remove_ports);

		return 0;
		}

		#ifdef CONFIG_PM_RUNTIME
		static int omap_ssi_runtime_suspend(struct device *dev)
		{
		struct hsi_controller *ssi = dev_get_drvdata(dev);
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);

		dev_dbg(dev, "runtime suspend!\n");

		if (omap_ssi->get_loss)
		omap_ssi->loss_count =
		omap_ssi->get_loss(ssi->device.parent);

		return 0;
		}

		static int omap_ssi_runtime_resume(struct device *dev)
		{
		struct hsi_controller *ssi = dev_get_drvdata(dev);
		struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);

		dev_dbg(dev, "runtime resume!\n");

		if ((omap_ssi->get_loss) && (omap_ssi->loss_count ==
		omap_ssi->get_loss(ssi->device.parent)))
		return 0;

		writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG);

		return 0;
		}

		static const struct dev_pm_ops omap_ssi_pm_ops = {
		SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume,
		NULL)
		};

		#define DEV_PM_OPS (&omap_ssi_pm_ops)
		#else
		#define DEV_PM_OPS NULL
		#endif

		#ifdef CONFIG_OF
		static const struct of_device_id omap_ssi_of_match[] = {
		{ .compatible = "ti,omap3-ssi", },
		{},
		};
		MODULE_DEVICE_TABLE(of, omap_ssi_of_match);
		#else
		#define omap_ssi_of_match NULL
		#endif

		static struct platform_driver ssi_pdriver = {
		.remove = __exit_p(ssi_remove),
		.driver = {
		.name = "omap_ssi",
		.owner = THIS_MODULE,
		.pm = DEV_PM_OPS,
		.of_match_table = omap_ssi_of_match,
		},
		};

		module_platform_driver_probe(ssi_pdriver, ssi_probe);

		MODULE_ALIAS("platform:omap_ssi");
		MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
		MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
		MODULE_DESCRIPTION("Synchronous Serial Interface Driver");
		MODULE_LICENSE("GPL v2");