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From:   Yazen Ghannam <yazen.ghannam@amd.com>
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CC:     <linux-kernel@vger.kernel.org>,
        <platform-driver-x86@vger.kernel.org>, <markgross@kernel.org>,
        <hdegoede@redhat.com>, <Shyam-sundar.S-k@amd.com>,
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        <jdelvare@suse.com>, <linux@roeck-us.net>,
        <linux-hwmon@vger.kernel.org>, <mario.limonciello@amd.com>,
        <babu.moger@amd.com>, Yazen Ghannam <yazen.ghannam@amd.com>
Subject: [PATCH 5/6] hwmon: (k10temp) Define helper function to read CCD temp
Date:   Tue, 16 May 2023 15:24:29 -0500
Message-ID: <20230516202430.4157216-6-yazen.ghannam@amd.com>
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The CCD temperature register is read in two places. These reads are done
using an AMD SMN access, and a number of parameters are needed for the
operation.

Move the SMN access and parameter gathering into a helper function in
order to simply the code flow. This also has a benefit of centralizing
the hardware register access in a single place in case fixes or special
decoding is required.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
 drivers/hwmon/k10temp.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 6ea1fa62b7c1..06af1fe38af7 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -150,6 +150,18 @@ static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
 		*regval = 0;
 }
 
+static int read_ccd_temp_reg(struct k10temp_data *data, int ccd, u32 *regval)
+{
+	u16 node_id = amd_pci_dev_to_node_id(data->pdev);
+	u32 tmp;
+
+	if (amd_smn_read(node_id, ZEN_CCD_TEMP(data->ccd_offset, ccd), &tmp))
+		return -EINVAL;
+
+	*regval = tmp;
+	return 0;
+}
+
 static long get_raw_temp(struct k10temp_data *data)
 {
 	u32 regval;
@@ -214,9 +226,7 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 				*val = 0;
 			break;
 		case 2 ... 13:		/* Tccd{1-12} */
-			if (amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
-					 ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
-					 &regval))
+			if (read_ccd_temp_reg(data, channel - 2, &regval))
 				return -EINVAL;
 
 			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
@@ -376,8 +386,7 @@ static void k10temp_get_ccd_support(struct pci_dev *pdev,
 	int i;
 
 	for (i = 0; i < limit; i++) {
-		if (amd_smn_read(amd_pci_dev_to_node_id(pdev),
-				 ZEN_CCD_TEMP(data->ccd_offset, i), &regval))
+		if (read_ccd_temp_reg(data, i, &regval))
 			continue;
 
 		if (regval & ZEN_CCD_TEMP_VALID)
-- 
2.34.1