fpga: dfl: fme-mgr: add compat_id support

This patch adds compat_id support to fme manager driver, it
reads the ID from the hardware register. And it could be used
for compatibility check before partial reconfiguration.

Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/fpga/dfl-fme-mgr.c b/drivers/fpga/dfl-fme-mgr.c
index df843b5..b5ef405 100644 (file)
--- a/drivers/fpga/dfl-fme-mgr.c
+++ b/drivers/fpga/dfl-fme-mgr.c
@@ -272,9 +272,17 @@ static const struct fpga_manager_ops fme_mgr_ops = {
        .status = fme_mgr_status,
 };
 
+static void fme_mgr_get_compat_id(void __iomem *fme_pr,
+                                 struct fpga_compat_id *id)
+{
+       id->id_l = readq(fme_pr + FME_PR_INTFC_ID_L);
+       id->id_h = readq(fme_pr + FME_PR_INTFC_ID_H);
+}
+
 static int fme_mgr_probe(struct platform_device *pdev)
 {
        struct dfl_fme_mgr_pdata *pdata = dev_get_platdata(&pdev->dev);
+       struct fpga_compat_id *compat_id;
        struct device *dev = &pdev->dev;
        struct fme_mgr_priv *priv;
        struct fpga_manager *mgr;
@@ -295,11 +303,18 @@ static int fme_mgr_probe(struct platform_device *pdev)
                        return PTR_ERR(priv->ioaddr);
        }
 
+       compat_id = devm_kzalloc(dev, sizeof(*compat_id), GFP_KERNEL);
+       if (!compat_id)
+               return -ENOMEM;
+
+       fme_mgr_get_compat_id(priv->ioaddr, compat_id);
+
        mgr = fpga_mgr_create(dev, "DFL FME FPGA Manager",
                              &fme_mgr_ops, priv);
        if (!mgr)
                return -ENOMEM;
 
+       mgr->compat_id = compat_id;
        platform_set_drvdata(pdev, mgr);
 
        ret = fpga_mgr_register(mgr);