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
# Makefile for HSI controllers drivers
#
-obj-$(CONFIG_OMAP_SSI) += omap_ssi.o
-obj-$(CONFIG_OMAP_SSI_PORT) += omap_ssi_port.o
+omap_ssi-objs += omap_ssi_core.o omap_ssi_port.o
+obj-$(CONFIG_OMAP_SSI) += omap_ssi.o
+++ /dev/null
-/* 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/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 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 (!omap_ssi->dir)
- return -ENOMEM;
-
- 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 (!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 -ENOMEM;
-}
-
-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 ssi_get_iomem(struct platform_device *pd,
- const char *name, void __iomem **pbase, dma_addr_t *phy)
-{
- struct resource *mem;
- void __iomem *base;
- struct hsi_controller *ssi = platform_get_drvdata(pd);
-
- mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name);
- base = devm_ioremap_resource(&ssi->device, mem);
- if (IS_ERR(base))
- return PTR_ERR(base);
-
- *pbase = base;
-
- if (phy)
- *phy = mem->start;
-
- return 0;
-}
-
-static int 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;
- }
-
- err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL);
- if (err < 0)
- goto out_err;
- ssi->id = 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;
- err = platform_get_irq_byname(pd, "gdd_mpu");
- if (err < 0) {
- dev_err(&pd->dev, "GDD IRQ resource missing\n");
- goto out_err;
- }
- omap_ssi->gdd_irq = 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 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);
-
- if (!dev->of_node)
- return 0;
-
- of_node_clear_flag(dev->of_node, OF_POPULATED);
- of_device_unregister(pdev);
-
- return 0;
-}
-
-static int 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 ssi_remove(struct platform_device *pd)
-{
- struct hsi_controller *ssi = platform_get_drvdata(pd);
-
- /* cleanup of of_platform_populate() call */
- device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
-
-#ifdef CONFIG_DEBUG_FS
- ssi_debug_remove_ctrl(ssi);
-#endif
- ssi_remove_controller(ssi);
- platform_set_drvdata(pd, NULL);
-
- pm_runtime_disable(&pd->dev);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-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 = {
- .probe = ssi_probe,
- .remove = ssi_remove,
- .driver = {
- .name = "omap_ssi",
- .pm = DEV_PM_OPS,
- .of_match_table = omap_ssi_of_match,
- },
-};
-
-module_platform_driver(ssi_pdriver);
-
-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");
#endif
};
+extern struct platform_driver ssi_port_pdriver;
+
#endif /* __LINUX_HSI_OMAP_SSI_H__ */
--- /dev/null
+/* 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/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 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 (!omap_ssi->dir)
+ return -ENOMEM;
+
+ 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 (!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 -ENOMEM;
+}
+
+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 ssi_get_iomem(struct platform_device *pd,
+ const char *name, void __iomem **pbase, dma_addr_t *phy)
+{
+ struct resource *mem;
+ void __iomem *base;
+ struct hsi_controller *ssi = platform_get_drvdata(pd);
+
+ mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name);
+ base = devm_ioremap_resource(&ssi->device, mem);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ *pbase = base;
+
+ if (phy)
+ *phy = mem->start;
+
+ return 0;
+}
+
+static int 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;
+ }
+
+ err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL);
+ if (err < 0)
+ goto out_err;
+ ssi->id = 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;
+ err = platform_get_irq_byname(pd, "gdd_mpu");
+ if (err < 0) {
+ dev_err(&pd->dev, "GDD IRQ resource missing\n");
+ goto out_err;
+ }
+ omap_ssi->gdd_irq = 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 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);
+
+ if (!dev->of_node)
+ return 0;
+
+ of_node_clear_flag(dev->of_node, OF_POPULATED);
+ of_device_unregister(pdev);
+
+ return 0;
+}
+
+static int 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 ssi_remove(struct platform_device *pd)
+{
+ struct hsi_controller *ssi = platform_get_drvdata(pd);
+
+ /* cleanup of of_platform_populate() call */
+ device_for_each_child(&pd->dev, NULL, ssi_remove_ports);
+
+#ifdef CONFIG_DEBUG_FS
+ ssi_debug_remove_ctrl(ssi);
+#endif
+ ssi_remove_controller(ssi);
+ platform_set_drvdata(pd, NULL);
+
+ pm_runtime_disable(&pd->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+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 = {
+ .probe = ssi_probe,
+ .remove = ssi_remove,
+ .driver = {
+ .name = "omap_ssi",
+ .pm = DEV_PM_OPS,
+ .of_match_table = omap_ssi_of_match,
+ },
+};
+
+static int __init ssi_init(void) {
+ int ret;
+
+ ret = platform_driver_register(&ssi_pdriver);
+ if (ret)
+ return ret;
+
+ return platform_driver_register(&ssi_port_pdriver);
+}
+module_init(ssi_init);
+
+static void __exit ssi_exit(void) {
+ platform_driver_unregister(&ssi_port_pdriver);
+ platform_driver_unregister(&ssi_pdriver);
+}
+module_exit(ssi_exit);
+
+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");
dev_dbg(&pd->dev, "init ssi port...\n");
- if (!try_module_get(ssi->owner)) {
- dev_err(&pd->dev, "could not increment parent module refcount\n");
- return -ENODEV;
- }
-
if (!ssi->port || !omap_ssi->port) {
dev_err(&pd->dev, "ssi controller not initialized!\n");
err = -ENODEV;
omap_ssi->port[omap_port->port_id] = NULL;
platform_set_drvdata(pd, NULL);
- module_put(ssi->owner);
pm_runtime_disable(&pd->dev);
return 0;
#define omap_ssi_port_of_match NULL
#endif
-static struct platform_driver ssi_port_pdriver = {
+struct platform_driver ssi_port_pdriver = {
.probe = ssi_port_probe,
.remove = ssi_port_remove,
.driver = {
.pm = DEV_PM_OPS,
},
};
-
-module_platform_driver(ssi_port_pdriver);
-
-MODULE_ALIAS("platform:omap_ssi_port");
-MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
-MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
-MODULE_DESCRIPTION("Synchronous Serial Interface Port Driver");
-MODULE_LICENSE("GPL v2");
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff