netdev - [PATCH net-next 2/2] net: macb: Add zynqmp SGMII dynamic configuration support

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Date:   Fri, 22 Jul 2022 13:42:00 +0530
From:   Radhey Shyam Pandey <radhey.shyam.pandey@....com>
To:     <michal.simek@...inx.com>, <nicolas.ferre@...rochip.com>,
        <claudiu.beznea@...rochip.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <gregkh@...uxfoundation.org>, <ronak.jain@...inx.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <git@...inx.com>, <git@....com>,
        "Radhey Shyam Pandey" <radhey.shyam.pandey@....com>
Subject: [PATCH net-next 2/2] net: macb: Add zynqmp SGMII dynamic configuration support

Add support for the dynamic configuration which takes care of configuring
the GEM secure space configuration registers using EEMI APIs. High level
sequence is to:
- Check for the PM dynamic configuration support, if no error proceed with
  GEM dynamic configurations(next steps) otherwise skip the dynamic
  configuration.
- Configure GEM Fixed configurations.
- Configure GEM_CLK_CTRL (gemX_sgmii_mode).
- Trigger GEM reset.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
---
 drivers/net/ethernet/cadence/macb_main.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 7eb7822cd184..97f77fa9e165 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -38,6 +38,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/ptp_classify.h>
 #include <linux/reset.h>
+#include <linux/firmware/xlnx-zynqmp.h>
 #include "macb.h"
 
 /* This structure is only used for MACB on SiFive FU540 devices */
@@ -4621,6 +4622,25 @@ static int init_reset_optional(struct platform_device *pdev)
 					     "failed to init SGMII PHY\n");
 	}
 
+	ret = zynqmp_pm_is_function_supported(PM_IOCTL, IOCTL_SET_GEM_CONFIG);
+	if (!ret) {
+		u32 pm_info[2];
+
+		ret = of_property_read_u32_array(pdev->dev.of_node, "power-domains",
+						 pm_info, ARRAY_SIZE(pm_info));
+		if (ret < 0) {
+			dev_err(&pdev->dev, "Failed to read power management information\n");
+			return ret;
+		}
+		ret = zynqmp_pm_set_gem_config(pm_info[1], GEM_CONFIG_FIXED, 0);
+		if (ret < 0)
+			return ret;
+
+		ret = zynqmp_pm_set_gem_config(pm_info[1], GEM_CONFIG_SGMII_MODE, 1);
+		if (ret < 0)
+			return ret;
+	}
+
 	/* Fully reset controller at hardware level if mapped in device tree */
 	ret = device_reset_optional(&pdev->dev);
 	if (ret) {
-- 
2.25.1