powerpc/85xx: Add lbc suspend support for PM

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / sysdev / fsl_lbc.c

diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
index c4d96fa32ba557a68512b133400fef585e799eb4..483126d7b3c0f51dce66f6d73881f1888c7d8e40 100644 (file)
--- a/arch/powerpc/sysdev/fsl_lbc.c
+++ b/arch/powerpc/sysdev/fsl_lbc.c
@@ -328,9 +328,42 @@ static int __devinit fsl_lbc_ctrl_probe(struct platform_device *dev)
 err:
        iounmap(fsl_lbc_ctrl_dev->regs);
        kfree(fsl_lbc_ctrl_dev);
+       fsl_lbc_ctrl_dev = NULL;
        return ret;
 }
 
+#ifdef CONFIG_SUSPEND
+
+/* save lbc registers */
+static int fsl_lbc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
+       struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
+
+       ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL);
+       if (!ctrl->saved_regs)
+               return -ENOMEM;
+
+       _memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs));
+       return 0;
+}
+
+/* restore lbc registers */
+static int fsl_lbc_resume(struct platform_device *pdev)
+{
+       struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
+       struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
+
+       if (ctrl->saved_regs) {
+               _memcpy_toio(lbc, ctrl->saved_regs,
+                               sizeof(struct fsl_lbc_regs));
+               kfree(ctrl->saved_regs);
+               ctrl->saved_regs = NULL;
+       }
+       return 0;
+}
+#endif /* CONFIG_SUSPEND */
+
 static const struct of_device_id fsl_lbc_match[] = {
        { .compatible = "fsl,elbc", },
        { .compatible = "fsl,pq3-localbus", },
@@ -345,6 +378,10 @@ static struct platform_driver fsl_lbc_ctrl_driver = {
                .of_match_table = fsl_lbc_match,
        },
        .probe = fsl_lbc_ctrl_probe,
+#ifdef CONFIG_SUSPEND
+       .suspend     = fsl_lbc_suspend,
+       .resume      = fsl_lbc_resume,
+#endif
 };
 
 static int __init fsl_lbc_init(void)