- 根目录:
- drivers
- hsi
- controllers
- omap_ssi.c
/* 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 (!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 __init 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 __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;
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 __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
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",
.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");