x86/platform/mellanox: Introduce support for Mellanox systems platform

Enable system support for the Mellanox Technologies platform, which
provides support for the next Mellanox basic systems: "msx6710",
"msx6720", "msb7700", "msn2700", "msx1410", "msn2410", "msb7800",
"msn2740", "msn2100" and also various number of derivative systems from
the above basic types.

The Kconfig controlling compilation of this code is: MLX_PLATFORM

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Cc: jiri@resnulli.us
Cc: gregkh@linuxfoundation.org
Cc: platform-driver-x86@vger.kernel.org
Cc: geert@linux-m68k.org
Cc: linux@roeck-us.net
Cc: akpm@linux-foundation.org
Cc: mchehab@kernel.org
Cc: davem@davemloft.net
Cc: kvalo@codeaurora.org
Link: http://lkml.kernel.org/r/1474578822-33805-1-git-send-email-vadimp@mellanox.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

5 files changed, 286 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index a0ce40f4c66c..2adc6ef635ce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7668,6 +7668,12 @@ W:	http://www.mellanox.com
 Q:      http://patchwork.ozlabs.org/project/netdev/list/
 F:      drivers/net/ethernet/mellanox/mlxsw/
 
+MELLANOX PLATFORM DRIVER
+M:      Vadim Pasternak <vadimp@mellanox.com>
+L:      platform-driver-x86@vger.kernel.org
+S:      Supported
+F:      arch/x86/platform/mellanox/mlx-platform.c
+
 SOFT-ROCE DRIVER (rxe)
 M:      Moni Shoua <monis@mellanox.com>
 L:      linux-rdma@vger.kernel.org
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2a1f0ce7c59a..a72b01b225f2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -549,6 +549,18 @@ config X86_INTEL_QUARK
           Say Y here if you have a Quark based system such as the Arduino
           compatible Intel Galileo.
 
+config MLX_PLATFORM
+        tristate "Mellanox Technologies platform support"
+        depends on X86_64
+        depends on X86_EXTENDED_PLATFORM
+        ---help---
+          This option enables system support for the Mellanox Technologies
+          platform.
+
+          Say Y here if you are building a kernel for Mellanox system.
+
+          Otherwise, say N.
+
 config X86_INTEL_LPSS
         bool "Intel Low Power Subsystem Support"
         depends on X86 && ACPI
diff --git a/arch/x86/platform/Makefile b/arch/x86/platform/Makefile
index 184842ef332e..3c3c19ea94df 100644
--- a/arch/x86/platform/Makefile
+++ b/arch/x86/platform/Makefile
@@ -8,6 +8,7 @@ obj-y	+= iris/
 obj-y   += intel/
 obj-y   += intel-mid/
 obj-y   += intel-quark/
+obj-y   += mellanox/
 obj-y   += olpc/
 obj-y   += scx200/
 obj-y   += sfi/
diff --git a/arch/x86/platform/mellanox/Makefile b/arch/x86/platform/mellanox/Makefile
new file mode 100644
index 000000000000..f43c93188a1d
--- /dev/null
+++ b/arch/x86/platform/mellanox/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MLX_PLATFORM)      += mlx-platform.o
diff --git a/arch/x86/platform/mellanox/mlx-platform.c b/arch/x86/platform/mellanox/mlx-platform.c
new file mode 100644
index 000000000000..e1dc1526b5f8
--- /dev/null
+++ b/arch/x86/platform/mellanox/mlx-platform.c
@@ -0,0 +1,266 @@
+/*
+ * arch/x86/platform/mellanox/mlx-platform.c
+ * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/device.h>
+#include <linux/dmi.h>
+#include <linux/i2c.h>
+#include <linux/i2c-mux.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/i2c-mux-reg.h>
+
+#define MLX_PLAT_DEVICE_NAME            "mlxplat"
+
+/* LPC bus IO offsets */
+#define MLXPLAT_CPLD_LPC_I2C_BASE_ADRR          0x2000
+#define MLXPLAT_CPLD_LPC_REG_BASE_ADRR          0x2500
+#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) | \
+                                  MLXPLAT_CPLD_LPC_PIO_OFFSET)
+#define MLXPLAT_CPLD_LPC_REG2   ((MLXPLAT_CPLD_LPC_REG_BASE_ADRR + \
+                                  MLXPLAT_CPLD_LPC_I2C_CH2_OFF) | \
+                                  MLXPLAT_CPLD_LPC_PIO_OFFSET)
+
+/* Start channel numbers */
+#define MLXPLAT_CPLD_CH1                        2
+#define MLXPLAT_CPLD_CH2                        10
+
+/* Number of LPC attached MUX platform devices */
+#define MLXPLAT_CPLD_LPC_MUX_DEVS               2
+
+/* mlxplat_priv - platform private data
+ * @pdev_i2c - i2c controller platform device
+ * @pdev_mux - array of mux platform devices
+ */
+struct mlxplat_priv {
+        struct platform_device *pdev_i2c;
+        struct platform_device *pdev_mux[MLXPLAT_CPLD_LPC_MUX_DEVS];
+};
+
+/* Regions for LPC I2C controller and LPC base register space */
+static const struct resource mlxplat_lpc_resources[] = {
+        [0] = DEFINE_RES_NAMED(MLXPLAT_CPLD_LPC_I2C_BASE_ADRR,
+                               MLXPLAT_CPLD_LPC_IO_RANGE,
+                               "mlxplat_cpld_lpc_i2c_ctrl", IORESOURCE_IO),
+        [1] = DEFINE_RES_NAMED(MLXPLAT_CPLD_LPC_REG_BASE_ADRR,
+                               MLXPLAT_CPLD_LPC_IO_RANGE,
+                               "mlxplat_cpld_lpc_regs",
+                               IORESOURCE_IO),
+};
+
+/* Platform default channels */
+static const int mlxplat_default_channels[][8] = {
+        {
+                MLXPLAT_CPLD_CH1, MLXPLAT_CPLD_CH1 + 1, MLXPLAT_CPLD_CH1 + 2,
+                MLXPLAT_CPLD_CH1 + 3, MLXPLAT_CPLD_CH1 + 4, MLXPLAT_CPLD_CH1 +
+                5, MLXPLAT_CPLD_CH1 + 6, MLXPLAT_CPLD_CH1 + 7
+        },
+        {
+                MLXPLAT_CPLD_CH2, MLXPLAT_CPLD_CH2 + 1, MLXPLAT_CPLD_CH2 + 2,
+                MLXPLAT_CPLD_CH2 + 3, MLXPLAT_CPLD_CH2 + 4, MLXPLAT_CPLD_CH2 +
+                5, MLXPLAT_CPLD_CH2 + 6, MLXPLAT_CPLD_CH2 + 7
+        },
+};
+
+/* Platform channels for MSN21xx system family */
+static const int mlxplat_msn21xx_channels[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+
+/* Platform mux data */
+static struct i2c_mux_reg_platform_data mlxplat_mux_data[] = {
+        {
+                .parent = 1,
+                .base_nr = MLXPLAT_CPLD_CH1,
+                .write_only = 1,
+                .reg = (void __iomem *)MLXPLAT_CPLD_LPC_REG1,
+                .reg_size = 1,
+                .idle_in_use = 1,
+        },
+        {
+                .parent = 1,
+                .base_nr = MLXPLAT_CPLD_CH2,
+                .write_only = 1,
+                .reg = (void __iomem *)MLXPLAT_CPLD_LPC_REG2,
+                .reg_size = 1,
+                .idle_in_use = 1,
+        },
+
+};
+
+static struct platform_device *mlxplat_dev;
+
+static int __init mlxplat_dmi_default_matched(const struct dmi_system_id *dmi)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(mlxplat_mux_data); i++) {
+                mlxplat_mux_data[i].values = mlxplat_default_channels[i];
+                mlxplat_mux_data[i].n_values =
+                                ARRAY_SIZE(mlxplat_default_channels[i]);
+        }
+
+        return 1;
+};
+
+static int __init mlxplat_dmi_msn21xx_matched(const struct dmi_system_id *dmi)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(mlxplat_mux_data); i++) {
+                mlxplat_mux_data[i].values = mlxplat_msn21xx_channels;
+                mlxplat_mux_data[i].n_values =
+                                ARRAY_SIZE(mlxplat_msn21xx_channels);
+        }
+
+        return 1;
+};
+
+static struct dmi_system_id mlxplat_dmi_table[] __initdata = {
+        {
+                .callback = mlxplat_dmi_default_matched,
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "MSN24"),
+                },
+        },
+        {
+                .callback = mlxplat_dmi_default_matched,
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "MSN27"),
+                },
+        },
+        {
+                .callback = mlxplat_dmi_default_matched,
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "MSB"),
+                },
+        },
+        {
+                .callback = mlxplat_dmi_default_matched,
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "MSX"),
+                },
+        },
+        {
+                .callback = mlxplat_dmi_msn21xx_matched,
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "MSN21"),
+                },
+        },
+        { }
+};
+
+static int __init mlxplat_init(void)
+{
+        struct mlxplat_priv *priv;
+        int i, err;
+
+        if (!dmi_check_system(mlxplat_dmi_table))
+                return -ENODEV;
+
+        mlxplat_dev = platform_device_register_simple(MLX_PLAT_DEVICE_NAME, -1,
+                                        mlxplat_lpc_resources,
+                                        ARRAY_SIZE(mlxplat_lpc_resources));
+
+        if (!mlxplat_dev)
+                return -ENOMEM;
+
+        priv = devm_kzalloc(&mlxplat_dev->dev, sizeof(struct mlxplat_priv),
+                            GFP_KERNEL);
+        if (!priv) {
+                err = -ENOMEM;
+                goto fail_alloc;
+        }
+        platform_set_drvdata(mlxplat_dev, priv);
+
+        priv->pdev_i2c = platform_device_register_simple("i2c_mlxcpld", -1,
+                                                         NULL, 0);
+        if (IS_ERR(priv->pdev_i2c)) {
+                err = PTR_ERR(priv->pdev_i2c);
+                goto fail_alloc;
+        };
+
+        for (i = 0; i < ARRAY_SIZE(mlxplat_mux_data); i++) {
+                priv->pdev_mux[i] = platform_device_register_resndata(
+                                                &mlxplat_dev->dev,
+                                                "i2c-mux-reg", i, NULL,
+                                                0, &mlxplat_mux_data[i],
+                                                sizeof(mlxplat_mux_data[i]));
+                if (IS_ERR(priv->pdev_mux[i])) {
+                        err = PTR_ERR(priv->pdev_mux[i]);
+                        goto fail_platform_mux_register;
+                }
+        }
+
+        return 0;
+
+fail_platform_mux_register:
+        for (i--; i > 0 ; i--)
+                platform_device_unregister(priv->pdev_mux[i]);
+        platform_device_unregister(priv->pdev_i2c);
+fail_alloc:
+        platform_device_unregister(mlxplat_dev);
+
+        return err;
+}
+module_init(mlxplat_init);
+
+static void __exit mlxplat_exit(void)
+{
+        struct mlxplat_priv *priv = platform_get_drvdata(mlxplat_dev);
+        int i;
+
+        for (i = ARRAY_SIZE(mlxplat_mux_data) - 1; i >= 0 ; i--)
+                platform_device_unregister(priv->pdev_mux[i]);
+
+        platform_device_unregister(priv->pdev_i2c);
+        platform_device_unregister(mlxplat_dev);
+}
+module_exit(mlxplat_exit);
+
+MODULE_AUTHOR("Vadim Pasternak (vadimp@mellanox.com)");
+MODULE_DESCRIPTION("Mellanox platform driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS("dmi:*:*Mellanox*:MSN24*:");
+MODULE_ALIAS("dmi:*:*Mellanox*:MSN27*:");
+MODULE_ALIAS("dmi:*:*Mellanox*:MSB*:");
+MODULE_ALIAS("dmi:*:*Mellanox*:MSX*:");
+MODULE_ALIAS("dmi:*:*Mellanox*:MSN21*:");