diff options
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/omap-usb-tll.c | 53 |
1 files changed, 27 insertions, 26 deletions
diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c index eccc65e97202..55c85c78ba44 100644 --- a/drivers/mfd/omap-usb-tll.c +++ b/drivers/mfd/omap-usb-tll.c @@ -103,14 +103,13 @@ struct usbtll_omap { int nch; /* num. of channels */ struct usbhs_omap_platform_data *pdata; struct clk **ch_clk; - /* secure the register updates */ - spinlock_t lock; }; /*-------------------------------------------------------------------------*/ static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME; static struct device *tll_dev; +static DEFINE_SPINLOCK(tll_lock); /* serialize access to tll_dev */ /*-------------------------------------------------------------------------*/ @@ -212,7 +211,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) struct resource *res; struct usbtll_omap *tll; unsigned reg; - unsigned long flags; int ret = 0; int i, ver; bool needs_tll; @@ -230,8 +228,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) return -ENODEV; } - spin_lock_init(&tll->lock); - tll->pdata = pdata; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -246,8 +242,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) pm_runtime_enable(dev); pm_runtime_get_sync(dev); - spin_lock_irqsave(&tll->lock, flags); - ver = usbtll_read(base, OMAP_USBTLL_REVISION); switch (ver) { case OMAP_USBTLL_REV1: @@ -265,8 +259,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) break; } - spin_unlock_irqrestore(&tll->lock, flags); - tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk * [tll->nch]), GFP_KERNEL); if (!tll->ch_clk) { @@ -286,8 +278,6 @@ static int usbtll_omap_probe(struct platform_device *pdev) dev_dbg(dev, "can't get clock : %s\n", clkname); } - spin_lock_irqsave(&tll->lock, flags); - needs_tll = false; for (i = 0; i < tll->nch; i++) needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]); @@ -332,10 +322,11 @@ static int usbtll_omap_probe(struct platform_device *pdev) } } - spin_unlock_irqrestore(&tll->lock, flags); pm_runtime_put_sync(dev); /* only after this can omap_tll_enable/disable work */ + spin_lock(&tll_lock); tll_dev = dev; + spin_unlock(&tll_lock); return 0; @@ -357,7 +348,9 @@ static int usbtll_omap_remove(struct platform_device *pdev) struct usbtll_omap *tll = platform_get_drvdata(pdev); int i; + spin_lock(&tll_lock); tll_dev = NULL; + spin_unlock(&tll_lock); for (i = 0; i < tll->nch; i++) if (!IS_ERR(tll->ch_clk[i])) @@ -371,13 +364,10 @@ static int usbtll_runtime_resume(struct device *dev) { struct usbtll_omap *tll = dev_get_drvdata(dev); struct usbhs_omap_platform_data *pdata = tll->pdata; - unsigned long flags; int i; dev_dbg(dev, "usbtll_runtime_resume\n"); - spin_lock_irqsave(&tll->lock, flags); - for (i = 0; i < tll->nch; i++) { if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { int r; @@ -393,8 +383,6 @@ static int usbtll_runtime_resume(struct device *dev) } } - spin_unlock_irqrestore(&tll->lock, flags); - return 0; } @@ -402,13 +390,10 @@ static int usbtll_runtime_suspend(struct device *dev) { struct usbtll_omap *tll = dev_get_drvdata(dev); struct usbhs_omap_platform_data *pdata = tll->pdata; - unsigned long flags; int i; dev_dbg(dev, "usbtll_runtime_suspend\n"); - spin_lock_irqsave(&tll->lock, flags); - for (i = 0; i < tll->nch; i++) { if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { if (!IS_ERR(tll->ch_clk[i])) @@ -416,8 +401,6 @@ static int usbtll_runtime_suspend(struct device *dev) } } - spin_unlock_irqrestore(&tll->lock, flags); - return 0; } @@ -439,21 +422,39 @@ static struct platform_driver usbtll_omap_driver = { int omap_tll_enable(void) { + int ret; + + spin_lock(&tll_lock); + if (!tll_dev) { pr_err("%s: OMAP USB TLL not initialized\n", __func__); - return -ENODEV; + ret = -ENODEV; + } else { + ret = pm_runtime_get_sync(tll_dev); } - return pm_runtime_get_sync(tll_dev); + + spin_unlock(&tll_lock); + + return ret; } EXPORT_SYMBOL_GPL(omap_tll_enable); int omap_tll_disable(void) { + int ret; + + spin_lock(&tll_lock); + if (!tll_dev) { pr_err("%s: OMAP USB TLL not initialized\n", __func__); - return -ENODEV; + ret = -ENODEV; + } else { + ret = pm_runtime_put_sync(tll_dev); } - return pm_runtime_put_sync(tll_dev); + + spin_unlock(&tll_lock); + + return ret; } EXPORT_SYMBOL_GPL(omap_tll_disable); |