platform/x86: mlx-platform: Add mlxreg-fan platform driver activation

Add mlxreg-fan platform driver activation. FAN driver uses the same regmap
infrastructure as others Mellanox platform drivers. Specific registers
description for default FAN platform data configuration are added to
mlx-platform. There are the registers for tachometers reading, PWM
control and FAN ownership control. The last one has a default value,
which is set at initialization time through the regmap infrastructure,
which is necessary for moving FAN control ownership from hardware to
software.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

1 files changed, 143 insertions, 1 deletions

diff --git a/drivers/platform/x86/mlx-platform.c b/drivers/platform/x86/mlx-platform.c
index 3a227509c7ac..deea6a6339af 100644
--- a/drivers/platform/x86/mlx-platform.c
+++ b/drivers/platform/x86/mlx-platform.c
@@ -59,6 +59,7 @@
 #define MLXPLAT_CPLD_LPC_REG_WP1_OFFSET         0x31
 #define MLXPLAT_CPLD_LPC_REG_GP2_OFFSET         0x32
 #define MLXPLAT_CPLD_LPC_REG_WP2_OFFSET         0x33
+#define MLXPLAT_CPLD_LPC_REG_PWM_CONTROL_OFFSET 0x37
 #define MLXPLAT_CPLD_LPC_REG_AGGR_OFFSET        0x3a
 #define MLXPLAT_CPLD_LPC_REG_AGGR_MASK_OFFSET   0x3b
 #define MLXPLAT_CPLD_LPC_REG_AGGRLO_OFFSET      0x40
@@ -73,9 +74,23 @@
 #define MLXPLAT_CPLD_LPC_REG_FAN_OFFSET         0x88
 #define MLXPLAT_CPLD_LPC_REG_FAN_EVENT_OFFSET   0x89
 #define MLXPLAT_CPLD_LPC_REG_FAN_MASK_OFFSET    0x8a
+#define MLXPLAT_CPLD_LPC_REG_PWM1_OFFSET        0xe3
+#define MLXPLAT_CPLD_LPC_REG_TACHO1_OFFSET      0xe4
+#define MLXPLAT_CPLD_LPC_REG_TACHO2_OFFSET      0xe5
+#define MLXPLAT_CPLD_LPC_REG_TACHO3_OFFSET      0xe6
+#define MLXPLAT_CPLD_LPC_REG_TACHO4_OFFSET      0xe7
+#define MLXPLAT_CPLD_LPC_REG_TACHO5_OFFSET      0xe8
+#define MLXPLAT_CPLD_LPC_REG_TACHO6_OFFSET      0xe9
+#define MLXPLAT_CPLD_LPC_REG_TACHO7_OFFSET      0xea
+#define MLXPLAT_CPLD_LPC_REG_TACHO8_OFFSET      0xeb
+#define MLXPLAT_CPLD_LPC_REG_TACHO9_OFFSET      0xec
+#define MLXPLAT_CPLD_LPC_REG_TACHO10_OFFSET     0xed
+#define MLXPLAT_CPLD_LPC_REG_TACHO11_OFFSET     0xee
+#define MLXPLAT_CPLD_LPC_REG_TACHO12_OFFSET     0xef
 #define MLXPLAT_CPLD_LPC_IO_RANGE               0x100
 #define MLXPLAT_CPLD_LPC_I2C_CH1_OFF            0xdb
 #define MLXPLAT_CPLD_LPC_I2C_CH2_OFF            0xda
+
 #define MLXPLAT_CPLD_LPC_PIO_OFFSET             0x10000UL
 #define MLXPLAT_CPLD_LPC_REG1   ((MLXPLAT_CPLD_LPC_REG_BASE_ADRR + \
                                   MLXPLAT_CPLD_LPC_I2C_CH1_OFF) | \
@@ -131,6 +146,7 @@
  * @pdev_hotplug - hotplug platform devices
  * @pdev_led - led platform devices
  * @pdev_io_regs - register access platform devices
+ * @pdev_fan - FAN platform devices
  */
 struct mlxplat_priv {
         struct platform_device *pdev_i2c;
@@ -138,6 +154,7 @@ struct mlxplat_priv {
         struct platform_device *pdev_hotplug;
         struct platform_device *pdev_led;
         struct platform_device *pdev_io_regs;
+        struct platform_device *pdev_fan;
 };
 
 /* Regions for LPC I2C controller and LPC base register space */
@@ -929,6 +946,79 @@ static struct mlxreg_core_platform_data mlxplat_default_regs_io_data = {
                 .counter = ARRAY_SIZE(mlxplat_mlxcpld_default_regs_io_data),
 };
 
+/* Platform FAN default */
+static struct mlxreg_core_data mlxplat_mlxcpld_default_fan_data[] = {
+        {
+                .label = "pwm1",
+                .reg = MLXPLAT_CPLD_LPC_REG_PWM1_OFFSET,
+        },
+        {
+                .label = "tacho1",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO1_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho2",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO2_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho3",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO3_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho4",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO4_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho5",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO5_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho6",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO6_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho7",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO7_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho8",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO8_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho9",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO9_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho10",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO10_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho11",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO11_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+        {
+                .label = "tacho12",
+                .reg = MLXPLAT_CPLD_LPC_REG_TACHO12_OFFSET,
+                .mask = GENMASK(7, 0),
+        },
+};
+
+static struct mlxreg_core_platform_data mlxplat_default_fan_data = {
+                .data = mlxplat_mlxcpld_default_fan_data,
+                .counter = ARRAY_SIZE(mlxplat_mlxcpld_default_fan_data),
+};
+
 static bool mlxplat_mlxcpld_writeable_reg(struct device *dev, unsigned int reg)
 {
         switch (reg) {
@@ -949,6 +1039,8 @@ static bool mlxplat_mlxcpld_writeable_reg(struct device *dev, unsigned int reg)
         case MLXPLAT_CPLD_LPC_REG_PWR_MASK_OFFSET:
         case MLXPLAT_CPLD_LPC_REG_FAN_EVENT_OFFSET:
         case MLXPLAT_CPLD_LPC_REG_FAN_MASK_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_PWM1_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_PWM_CONTROL_OFFSET:
                 return true;
         }
         return false;
@@ -983,6 +1075,20 @@ static bool mlxplat_mlxcpld_readable_reg(struct device *dev, unsigned int reg)
         case MLXPLAT_CPLD_LPC_REG_FAN_OFFSET:
         case MLXPLAT_CPLD_LPC_REG_FAN_EVENT_OFFSET:
         case MLXPLAT_CPLD_LPC_REG_FAN_MASK_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_PWM1_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO1_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO2_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO3_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO4_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO5_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO6_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO7_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO8_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO9_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO10_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO11_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO12_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_PWM_CONTROL_OFFSET:
                 return true;
         }
         return false;
@@ -1015,6 +1121,20 @@ static bool mlxplat_mlxcpld_volatile_reg(struct device *dev, unsigned int reg)
         case MLXPLAT_CPLD_LPC_REG_FAN_OFFSET:
         case MLXPLAT_CPLD_LPC_REG_FAN_EVENT_OFFSET:
         case MLXPLAT_CPLD_LPC_REG_FAN_MASK_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_PWM1_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO1_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO2_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO3_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO4_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO5_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO6_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO7_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO8_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO9_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO10_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO11_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_TACHO12_OFFSET:
+        case MLXPLAT_CPLD_LPC_REG_PWM_CONTROL_OFFSET:
                 return true;
         }
         return false;
@@ -1023,6 +1143,7 @@ static bool mlxplat_mlxcpld_volatile_reg(struct device *dev, unsigned int reg)
 static const struct reg_default mlxplat_mlxcpld_regmap_default[] = {
         { MLXPLAT_CPLD_LPC_REG_WP1_OFFSET, 0x00 },
         { MLXPLAT_CPLD_LPC_REG_WP2_OFFSET, 0x00 },
+        { MLXPLAT_CPLD_LPC_REG_PWM_CONTROL_OFFSET, 0x00 },
 };
 
 struct mlxplat_mlxcpld_regmap_context {
@@ -1071,6 +1192,7 @@ static struct platform_device *mlxplat_dev;
 static struct mlxreg_core_hotplug_platform_data *mlxplat_hotplug;
 static struct mlxreg_core_platform_data *mlxplat_led;
 static struct mlxreg_core_platform_data *mlxplat_regs_io;
+static struct mlxreg_core_platform_data *mlxplat_fan;
 
 static int __init mlxplat_dmi_default_matched(const struct dmi_system_id *dmi)
 {
@@ -1155,6 +1277,7 @@ static int __init mlxplat_dmi_qmb7xx_matched(const struct dmi_system_id *dmi)
         mlxplat_hotplug->deferred_nr =
                 mlxplat_msn21xx_channels[MLXPLAT_CPLD_GRP_CHNL_NUM - 1];
         mlxplat_led = &mlxplat_msn21xx_led_data;
+        mlxplat_fan = &mlxplat_default_fan_data;
 
         return 1;
 };
@@ -1410,14 +1533,31 @@ static int __init mlxplat_init(void)
                 }
         }
 
+        /* Add FAN driver. */
+        if (mlxplat_fan) {
+                mlxplat_fan->regmap = mlxplat_hotplug->regmap;
+                priv->pdev_fan = platform_device_register_resndata(
+                                        &mlxplat_dev->dev, "mlxreg-fan",
+                                        PLATFORM_DEVID_NONE, NULL, 0,
+                                        mlxplat_fan,
+                                        sizeof(*mlxplat_fan));
+                if (IS_ERR(priv->pdev_io_regs)) {
+                        err = PTR_ERR(priv->pdev_io_regs);
+                        goto fail_platform_io_regs_register;
+                }
+        }
+
         /* Sync registers with hardware. */
         regcache_mark_dirty(mlxplat_hotplug->regmap);
         err = regcache_sync(mlxplat_hotplug->regmap);
         if (err)
-                goto fail_platform_io_regs_register;
+                goto fail_platform_fan_register;
 
         return 0;
 
+fail_platform_fan_register:
+        if (mlxplat_fan)
+                platform_device_unregister(priv->pdev_fan);
 fail_platform_io_regs_register:
         if (mlxplat_regs_io)
                 platform_device_unregister(priv->pdev_io_regs);
@@ -1441,6 +1581,8 @@ static void __exit mlxplat_exit(void)
         struct mlxplat_priv *priv = platform_get_drvdata(mlxplat_dev);
         int i;
 
+        if (priv->pdev_fan)
+                platform_device_unregister(priv->pdev_fan);
         if (priv->pdev_io_regs)
                 platform_device_unregister(priv->pdev_io_regs);
         platform_device_unregister(priv->pdev_led);