diff options
Diffstat (limited to 'drivers/net/ethernet/marvell/mvmdio.c')
| -rw-r--r-- | drivers/net/ethernet/marvell/mvmdio.c | 142 |
1 files changed, 112 insertions, 30 deletions
diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c index 77b7c80..e2f6626 100644 --- a/drivers/net/ethernet/marvell/mvmdio.c +++ b/drivers/net/ethernet/marvell/mvmdio.c @@ -24,10 +24,14 @@ #include <linux/module.h> #include <linux/mutex.h> #include <linux/phy.h> -#include <linux/of_address.h> -#include <linux/of_mdio.h> +#include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/delay.h> +#include <linux/io.h> +#include <linux/clk.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 +40,59 @@ #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 *smireg; + void __iomem *regs; + struct clk *clk; + /* + * 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->smireg); - 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++; + 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; + } } return 0; @@ -87,12 +117,12 @@ static int orion_mdio_read(struct mii_bus *bus, int mii_id, writel(((mii_id << MVMDIO_SMI_PHY_ADDR_SHIFT) | (regnum << MVMDIO_SMI_PHY_REG_SHIFT) | MVMDIO_SMI_READ_OPERATION), - dev->smireg); + dev->regs); /* Wait for the value to become available */ count = 0; while (1) { - val = readl(dev->smireg); + val = readl(dev->regs); if (val & MVMDIO_SMI_READ_VALID) break; @@ -129,7 +159,7 @@ static int orion_mdio_write(struct mii_bus *bus, int mii_id, (regnum << MVMDIO_SMI_PHY_REG_SHIFT) | MVMDIO_SMI_WRITE_OPERATION | (value << MVMDIO_SMI_DATA_SHIFT)), - dev->smireg); + dev->regs); mutex_unlock(&dev->lock); @@ -141,13 +171,34 @@ 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 device_node *np = pdev->dev.of_node; + struct resource *r; struct mii_bus *bus; struct orion_mdio_dev *dev; int i, ret; + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + dev_err(&pdev->dev, "No SMI register address given\n"); + return -ENODEV; + } + bus = mdiobus_alloc_size(sizeof(struct orion_mdio_dev)); if (!bus) { dev_err(&pdev->dev, "Cannot allocate MDIO bus\n"); @@ -172,36 +223,66 @@ static int orion_mdio_probe(struct platform_device *pdev) bus->irq[i] = PHY_POLL; dev = bus->priv; - dev->smireg = of_iomap(pdev->dev.of_node, 0); - if (!dev->smireg) { - dev_err(&pdev->dev, "No SMI register address given in DT\n"); - kfree(bus->irq); - mdiobus_free(bus); - return -ENODEV; + dev->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r)); + if (!dev->regs) { + dev_err(&pdev->dev, "Unable to remap SMI register\n"); + ret = -ENODEV; + goto out_mdio; + } + + init_waitqueue_head(&dev->smi_busy_wait); + + dev->clk = devm_clk_get(&pdev->dev, NULL); + if (!IS_ERR(dev->clk)) + clk_prepare_enable(dev->clk); + + 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); - ret = of_mdiobus_register(bus, np); + if (pdev->dev.of_node) + ret = of_mdiobus_register(bus, pdev->dev.of_node); + else + ret = mdiobus_register(bus); if (ret < 0) { dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret); - iounmap(dev->smireg); - kfree(bus->irq); - mdiobus_free(bus); - return ret; + goto out_mdio; } platform_set_drvdata(pdev, bus); return 0; + +out_mdio: + if (!IS_ERR(dev->clk)) + clk_disable_unprepare(dev->clk); + 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); + if (!IS_ERR(dev->clk)) + clk_disable_unprepare(dev->clk); + return 0; } @@ -225,3 +306,4 @@ module_platform_driver(orion_mdio_driver); MODULE_DESCRIPTION("Marvell MDIO interface driver"); MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>"); MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:orion-mdio"); |
