hwmon: (k10temp) Add support for F15h M60h

This patch adds temperature monitoring support for F15h M60h processor.
 - Add new pci device id for the relevant processor
 - The functionality of REG_REPORTED_TEMPERATURE is moved to
   D0F0xBC_xD820_0CA4 [Reported Temperature Control]
   - So, use this to get CUR_TEMP value
   - Since we need an indirect register access, protect this with
     a mutex lock
 - Add Kconfig, Doc entries to indicate support for this processor.

Signed-off-by: Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
[Guenter Roeck: Declare new mutex and function static]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 35 insertions, 6 deletions

diff --git a/Documentation/hwmon/k10temp b/Documentation/hwmon/k10temp
index ee6d30ec1522..254d2f55345a 100644
--- a/Documentation/hwmon/k10temp
+++ b/Documentation/hwmon/k10temp
@@ -11,7 +11,7 @@ Supported chips:
   Socket S1G2: Athlon (X2), Sempron (X2), Turion X2 (Ultra)
 * AMD Family 12h processors: "Llano" (E2/A4/A6/A8-Series)
 * AMD Family 14h processors: "Brazos" (C/E/G/Z-Series)
-* AMD Family 15h processors: "Bulldozer" (FX-Series), "Trinity", "Kaveri"
+* AMD Family 15h processors: "Bulldozer" (FX-Series), "Trinity", "Kaveri", "Carrizo"
 * AMD Family 16h processors: "Kabini", "Mullins"
 
   Prefix: 'k10temp'
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index f00d048aa583..4289a4fa1a03 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -280,8 +280,8 @@ config SENSORS_K10TEMP
           If you say yes here you get support for the temperature
           sensor(s) inside your CPU. Supported are later revisions of
           the AMD Family 10h and all revisions of the AMD Family 11h,
-          12h (Llano), 14h (Brazos), 15h (Bulldozer/Trinity/Kaveri) and
-          16h (Kabini/Mullins) microarchitectures.
+          12h (Llano), 14h (Brazos), 15h (Bulldozer/Trinity/Kaveri/Carrizo)
+          and 16h (Kabini/Mullins) microarchitectures.
 
           This driver can also be built as a module.  If so, the module
           will be called k10temp.
diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index f7b46f68ef43..730bdf702377 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -33,6 +33,9 @@ static bool force;
 module_param(force, bool, 0444);
 MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
 
+/* Provide lock for writing to NB_SMU_IND_ADDR */
+static DEFINE_MUTEX(nb_smu_ind_mutex);
+
 /* CPUID function 0x80000001, ebx */
 #define CPUID_PKGTYPE_MASK      0xf0000000
 #define CPUID_PKGTYPE_F         0x00000000
@@ -51,13 +54,38 @@ MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
 #define REG_NORTHBRIDGE_CAPABILITIES    0xe8
 #define  NB_CAP_HTC                     0x00000400
 
+/*
+ * For F15h M60h, functionality of REG_REPORTED_TEMPERATURE
+ * has been moved to D0F0xBC_xD820_0CA4 [Reported Temperature
+ * Control]
+ */
+#define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET     0xd8200ca4
+#define PCI_DEVICE_ID_AMD_15H_M60H_NB_F3        0x1573
+
+static void amd_nb_smu_index_read(struct pci_dev *pdev, unsigned int devfn,
+                                  int offset, u32 *val)
+{
+        mutex_lock(&nb_smu_ind_mutex);
+        pci_bus_write_config_dword(pdev->bus, devfn,
+                                   0xb8, offset);
+        pci_bus_read_config_dword(pdev->bus, devfn,
+                                  0xbc, val);
+        mutex_unlock(&nb_smu_ind_mutex);
+}
+
 static ssize_t show_temp(struct device *dev,
                          struct device_attribute *attr, char *buf)
 {
         u32 regval;
-
-        pci_read_config_dword(to_pci_dev(dev),
-                              REG_REPORTED_TEMPERATURE, &regval);
+        struct pci_dev *pdev = to_pci_dev(dev);
+
+        if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model == 0x60) {
+                amd_nb_smu_index_read(pdev, PCI_DEVFN(0, 0),
+                                      F15H_M60H_REPORTED_TEMP_CTRL_OFFSET,
+                                      &regval);
+        } else {
+                pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, &regval);
+        }
         return sprintf(buf, "%u\n", (regval >> 21) * 125);
 }
 
@@ -211,6 +239,7 @@ static const struct pci_device_id k10temp_id_table[] = {
         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
+        { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
         {}