From: Vadim Pasternak <vad...@mellanox.com>

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 currently controlling compilation of this code is:
arch/x86/platform:config MLX_PLATFORM
arch/x86/platform:      tristate "Mellanox Technologies platform support"

Signed-off-by: Vadim Pasternak <vad...@mellanox.com>
---
v1->v2:
 Comments pointed out by Greg:
  - kick out all PCI related code;
v2->v3
 Comments pointed out by Guenter:
  - remove not directly related depends and selects for Kconfig;
  - use single dimensional array for mlxplat_msn21xx_channels;
  - define mlxplat_mux_data and mlxplat_priv as static;
  - fix line split;
  - remove error messages for memory allocation failure;
  - change module alias to dmi;
v3->v4
 Comments pointed out by Thomas:
  - remove dependencies from Kconfig for DMI and I2C.
v4->v5
 Comments pointed out by Greg:
  - fix LICENSE;
---
 MAINTAINERS                               |   6 +
 arch/x86/Kconfig                          |  12 ++
 arch/x86/platform/Makefile                |   1 +
 arch/x86/platform/mellanox/Makefile       |   1 +
 arch/x86/platform/mellanox/mlx-platform.c | 268 ++++++++++++++++++++++++++++++
 5 files changed, 288 insertions(+)
 create mode 100644 arch/x86/platform/mellanox/Makefile
 create mode 100644 arch/x86/platform/mellanox/mlx-platform.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 4705c94..98ced39 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7664,6 +7664,12 @@ 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 <vad...@mellanox.com>
+L:      platform-driver-...@vger.kernel.org
+S:      Supported
+F:      arch/x86/platform/mellanox/mlx-platform.c
+
 SOFT-ROCE DRIVER (rxe)
 M:     Moni Shoua <mo...@mellanox.com>
 L:     linux-r...@vger.kernel.org
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c580d8c..a6df619 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -550,6 +550,18 @@ 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 184842e..3c3c19e 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 0000000..f43c931
--- /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 0000000..43ed102
--- /dev/null
+++ b/arch/x86/platform/mellanox/mlx-platform.c
@@ -0,0 +1,268 @@
+/*
+ * arch/x86/platform/mellanox/mlx-platform.c
+ * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016 Vadim Pasternak <vad...@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 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 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 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;
+       int 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 err;
+
+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;
+}
+
+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_init(mlxplat_init);
+module_exit(mlxplat_exit);
+
+MODULE_AUTHOR("Vadim Pasternak (vad...@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*:");
-- 
2.1.4

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