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From:   Dinh Nguyen <dinguyen@kernel.org>
To:     gregkh@linuxfoundation.org
Cc:     dinguyen@kernel.org, linux-kernel@vger.kernel.org,
        Radu Bacrau <radu.bacrau@intel.com>,
        Kah Jing Lee <kah.jing.lee@intel.com>
Subject: [PATCH 2/2] firmware: stratix10-rsu: query spt addresses
Date:   Thu, 27 Jul 2023 14:29:07 -0500
Message-Id: <20230727192907.982070-2-dinguyen@kernel.org>
In-Reply-To: <20230727192907.982070-1-dinguyen@kernel.org>
References: <20230727192907.982070-1-dinguyen@kernel.org>
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From: Radu Bacrau <radu.bacrau@intel.com>

Extend Intel Remote System Update (RSU) driver to get SPT
(Sub-Partition Table) addresses. The query SPT address can be used
to determine if the RSU QSPI layout is 32kB or 64kB aligned.
The alignment can be determined by minus the upper with the lower of
the SPT addresses.

This patch depends on patch:
firmware: stratix10-svc: Generic Mailbox Command

Signed-off-by: Radu Bacrau <radu.bacrau@intel.com>
Signed-off-by: Kah Jing Lee <kah.jing.lee@intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
---
 drivers/firmware/stratix10-rsu.c | 100 ++++++++++++++++++++++++++++++-
 1 file changed, 99 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/stratix10-rsu.c b/drivers/firmware/stratix10-rsu.c
index e51c95f8d445..fbc54533ad99 100644
--- a/drivers/firmware/stratix10-rsu.c
+++ b/drivers/firmware/stratix10-rsu.c
@@ -34,6 +34,10 @@
 #define INVALID_RETRY_COUNTER		0xFF
 #define INVALID_DCMF_VERSION		0xFF
 #define INVALID_DCMF_STATUS		0xFFFFFFFF
+#define INVALID_SPT_ADDRESS		0x0
+
+#define RSU_GET_SPT_CMD			0x5A
+#define RSU_GET_SPT_RESP_LEN		(4 * sizeof(unsigned int))
 
 typedef void (*rsu_callback)(struct stratix10_svc_client *client,
 			     struct stratix10_svc_cb_data *data);
@@ -59,6 +63,9 @@ typedef void (*rsu_callback)(struct stratix10_svc_client *client,
  * @dcmf_status.dcmf3: dcmf3 status
  * @retry_counter: the current image's retry counter
  * @max_retry: the preset max retry value
+ * @spt0_address: address of spt0
+ * @spt1_address: address of spt1
+ * @get_spt_response_buf: response from sdm for get_spt command
  */
 struct stratix10_rsu_priv {
 	struct stratix10_svc_chan *chan;
@@ -90,6 +97,11 @@ struct stratix10_rsu_priv {
 
 	unsigned int retry_counter;
 	unsigned int max_retry;
+
+	unsigned long spt0_address;
+	unsigned long spt1_address;
+
+	unsigned int *get_spt_response_buf;
 };
 
 /**
@@ -259,6 +271,36 @@ static void rsu_dcmf_status_callback(struct stratix10_svc_client *client,
 	complete(&priv->completion);
 }
 
+static void rsu_get_spt_callback(struct stratix10_svc_client *client,
+				 struct stratix10_svc_cb_data *data)
+{
+	struct stratix10_rsu_priv *priv = client->priv;
+	unsigned long *mbox_err = (unsigned long *)data->kaddr1;
+	unsigned long *resp_len = (unsigned long *)data->kaddr2;
+
+	if (data->status != BIT(SVC_STATUS_OK) || (*mbox_err) ||
+	    (*resp_len != RSU_GET_SPT_RESP_LEN))
+		goto error;
+
+	priv->spt0_address = priv->get_spt_response_buf[0];
+	priv->spt0_address <<= 32;
+	priv->spt0_address |= priv->get_spt_response_buf[1];
+
+	priv->spt1_address = priv->get_spt_response_buf[2];
+	priv->spt1_address <<= 32;
+	priv->spt1_address |= priv->get_spt_response_buf[3];
+
+	goto complete;
+
+error:
+	dev_err(client->dev, "failed to get SPTs\n");
+
+complete:
+	stratix10_svc_free_memory(priv->chan, priv->get_spt_response_buf);
+	priv->get_spt_response_buf = NULL;
+	complete(&priv->completion);
+}
+
 /**
  * rsu_send_msg() - send a message to Intel service layer
  * @priv: pointer to rsu private data
@@ -288,6 +330,14 @@ static int rsu_send_msg(struct stratix10_rsu_priv *priv,
 	if (arg)
 		msg.arg[0] = arg;
 
+	if (command == COMMAND_MBOX_SEND_CMD) {
+		msg.arg[1] = 0;
+		msg.payload = NULL;
+		msg.payload_length = 0;
+		msg.payload_output = priv->get_spt_response_buf;
+		msg.payload_length_output = RSU_GET_SPT_RESP_LEN;
+	}
+
 	ret = stratix10_svc_send(priv->chan, &msg);
 	if (ret < 0)
 		goto status_done;
@@ -572,6 +622,34 @@ static ssize_t notify_store(struct device *dev,
 	return count;
 }
 
+static ssize_t spt0_address_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
+
+	if (!priv)
+		return -ENODEV;
+
+	if (priv->spt0_address == INVALID_SPT_ADDRESS)
+		return -EIO;
+
+	return scnprintf(buf, PAGE_SIZE, "0x%08lx\n", priv->spt0_address);
+}
+
+static ssize_t spt1_address_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
+
+	if (!priv)
+		return -ENODEV;
+
+	if (priv->spt1_address == INVALID_SPT_ADDRESS)
+		return -EIO;
+
+	return scnprintf(buf, PAGE_SIZE, "0x%08lx\n", priv->spt1_address);
+}
+
 static DEVICE_ATTR_RO(current_image);
 static DEVICE_ATTR_RO(fail_image);
 static DEVICE_ATTR_RO(state);
@@ -590,6 +668,8 @@ static DEVICE_ATTR_RO(dcmf2_status);
 static DEVICE_ATTR_RO(dcmf3_status);
 static DEVICE_ATTR_WO(reboot_image);
 static DEVICE_ATTR_WO(notify);
+static DEVICE_ATTR_RO(spt0_address);
+static DEVICE_ATTR_RO(spt1_address);
 
 static struct attribute *rsu_attrs[] = {
 	&dev_attr_current_image.attr,
@@ -610,6 +690,8 @@ static struct attribute *rsu_attrs[] = {
 	&dev_attr_dcmf3_status.attr,
 	&dev_attr_reboot_image.attr,
 	&dev_attr_notify.attr,
+	&dev_attr_spt0_address.attr,
+	&dev_attr_spt1_address.attr,
 	NULL
 };
 
@@ -639,11 +721,13 @@ static int stratix10_rsu_probe(struct platform_device *pdev)
 	priv->dcmf_version.dcmf1 = INVALID_DCMF_VERSION;
 	priv->dcmf_version.dcmf2 = INVALID_DCMF_VERSION;
 	priv->dcmf_version.dcmf3 = INVALID_DCMF_VERSION;
-	priv->max_retry = INVALID_RETRY_COUNTER;
 	priv->dcmf_status.dcmf0 = INVALID_DCMF_STATUS;
 	priv->dcmf_status.dcmf1 = INVALID_DCMF_STATUS;
 	priv->dcmf_status.dcmf2 = INVALID_DCMF_STATUS;
 	priv->dcmf_status.dcmf3 = INVALID_DCMF_STATUS;
+	priv->max_retry = INVALID_RETRY_COUNTER;
+	priv->spt0_address = INVALID_SPT_ADDRESS;
+	priv->spt1_address = INVALID_SPT_ADDRESS;
 
 	mutex_init(&priv->lock);
 	priv->chan = stratix10_svc_request_channel_byname(&priv->client,
@@ -693,6 +777,20 @@ static int stratix10_rsu_probe(struct platform_device *pdev)
 		stratix10_svc_free_channel(priv->chan);
 	}
 
+	priv->get_spt_response_buf =
+		stratix10_svc_allocate_memory(priv->chan, RSU_GET_SPT_RESP_LEN);
+
+	if (IS_ERR(priv->get_spt_response_buf)) {
+		dev_err(dev, "failed to allocate get spt buffer\n");
+	} else {
+		ret = rsu_send_msg(priv, COMMAND_MBOX_SEND_CMD,
+				   RSU_GET_SPT_CMD, rsu_get_spt_callback);
+		if (ret) {
+			dev_err(dev, "Error, getting SPT table %i\n", ret);
+			stratix10_svc_free_channel(priv->chan);
+		}
+	}
+
 	return ret;
 }
 
-- 
2.25.1