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net: mvmdio: enhance driver to support SMI error/done interrupts 

This patch enhances the "mvmdio" to support a SMI error/done interrupt
line which can be used along with a wait queue instead of doing
busy-waiting on the registers. This is a feature which is available in
the mv643xx_eth SMI code and thus reduces again the gap between the two.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2013-03-22 03:39:27 +00:00 committed by David S. Miller
parent 3712b71769
commit 2ec9852138
2 changed files with 83 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/net/marvell-orion-mdio.txt
View File

@ -9,6 +9,9 @@ Required properties:
- compatible: "marvell,orion-mdio"
- reg: address and length of the SMI register
Optional properties:
- interrupts: interrupt line number for the SMI error/done interrupt
The child nodes of the MDIO driver are the individual PHY devices
connected to this MDIO bus. They must have a "reg" property given the
PHY address on the MDIO bus.

98
drivers/net/ethernet/marvell/mvmdio.c
View File

@ -24,10 +24,13 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/phy.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of_mdio.h>
#include <linux/sched.h>
#include <linux/wait.h>
#define MVMDIO_SMI_DATA_SHIFT 0
#define MVMDIO_SMI_PHY_ADDR_SHIFT 16
@ -36,33 +39,58 @@
#define MVMDIO_SMI_WRITE_OPERATION 0
#define MVMDIO_SMI_READ_VALID BIT(27)
#define MVMDIO_SMI_BUSY BIT(28)
#define MVMDIO_ERR_INT_CAUSE 0x007C
#define MVMDIO_ERR_INT_SMI_DONE 0x00000010
#define MVMDIO_ERR_INT_MASK 0x0080
struct orion_mdio_dev {
struct mutex lock;
void __iomem *regs;
/*
* If we have access to the error interrupt pin (which is
* somewhat misnamed as it not only reflects internal errors
* but also reflects SMI completion), use that to wait for
* SMI access completion instead of polling the SMI busy bit.
*/
int err_interrupt;
wait_queue_head_t smi_busy_wait;
};
static int orion_mdio_smi_is_done(struct orion_mdio_dev *dev)
{
return !(readl(dev->regs) & MVMDIO_SMI_BUSY);
}
/* Wait for the SMI unit to be ready for another operation
*/
static int orion_mdio_wait_ready(struct mii_bus *bus)
{
struct orion_mdio_dev *dev = bus->priv;
int count;
u32 val;
count = 0;
while (1) {
val = readl(dev->regs);
if (!(val & MVMDIO_SMI_BUSY))
break;
if (dev->err_interrupt <= 0) {
count = 0;
while (1) {
if (orion_mdio_smi_is_done(dev))
break;
if (count > 100) {
dev_err(bus->parent, "Timeout: SMI busy for too long\n");
return -ETIMEDOUT;
if (count > 100) {
dev_err(bus->parent,
"Timeout: SMI busy for too long\n");
return -ETIMEDOUT;
}
udelay(10);
count++;
}
} else {
if (!orion_mdio_smi_is_done(dev)) {
wait_event_timeout(dev->smi_busy_wait,
orion_mdio_smi_is_done(dev),
msecs_to_jiffies(100));
if (!orion_mdio_smi_is_done(dev))
return -ETIMEDOUT;
}
udelay(10);
count++;
}
return 0;
@ -141,6 +169,21 @@ static int orion_mdio_reset(struct mii_bus *bus)
return 0;
}
static irqreturn_t orion_mdio_err_irq(int irq, void *dev_id)
{
struct orion_mdio_dev *dev = dev_id;
if (readl(dev->regs + MVMDIO_ERR_INT_CAUSE) &
MVMDIO_ERR_INT_SMI_DONE) {
writel(~MVMDIO_ERR_INT_SMI_DONE,
dev->regs + MVMDIO_ERR_INT_CAUSE);
wake_up(&dev->smi_busy_wait);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int orion_mdio_probe(struct platform_device *pdev)
{
struct resource *r;
@ -181,9 +224,22 @@ static int orion_mdio_probe(struct platform_device *pdev)
dev->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
if (!dev->regs) {
dev_err(&pdev->dev, "Unable to remap SMI register\n");
kfree(bus->irq);
mdiobus_free(bus);
return -ENODEV;
ret = -ENODEV;
goto out_mdio;
}
init_waitqueue_head(&dev->smi_busy_wait);
dev->err_interrupt = platform_get_irq(pdev, 0);
if (dev->err_interrupt != -ENXIO) {
ret = devm_request_irq(&pdev->dev, dev->err_interrupt,
orion_mdio_err_irq,
IRQF_SHARED, pdev->name, dev);
if (ret)
goto out_mdio;
writel(MVMDIO_ERR_INT_SMI_DONE,
dev->regs + MVMDIO_ERR_INT_MASK);
}
mutex_init(&dev->lock);
@ -194,19 +250,25 @@ static int orion_mdio_probe(struct platform_device *pdev)
ret = mdiobus_register(bus);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
kfree(bus->irq);
mdiobus_free(bus);
return ret;
goto out_mdio;
}
platform_set_drvdata(pdev, bus);
return 0;
out_mdio:
kfree(bus->irq);
mdiobus_free(bus);
return ret;
}
static int orion_mdio_remove(struct platform_device *pdev)
{
struct mii_bus *bus = platform_get_drvdata(pdev);
struct orion_mdio_dev *dev = bus->priv;
writel(0, dev->regs + MVMDIO_ERR_INT_MASK);
mdiobus_unregister(bus);
kfree(bus->irq);
mdiobus_free(bus);