5 files changed, 103 insertions, 0 deletions

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 339baa87336f..c8543855aa82 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -1,3 +1,5 @@
 menu "SOC (System On Chip) specific Drivers"
 
+source "drivers/soc/qcom/Kconfig"
+
 endmenu
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
new file mode 100644
index 000000000000..0f7c44793b29
--- /dev/null
+++ b/drivers/soc/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the Linux Kernel SOC specific device drivers.
+#
+
+obj-$(CONFIG_ARCH_QCOM)         += qcom/
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
new file mode 100644
index 000000000000..7bd2c94f54a4
--- /dev/null
+++ b/drivers/soc/qcom/Kconfig
@@ -0,0 +1,11 @@
+#
+# QCOM Soc drivers
+#
+config QCOM_GSBI
+        tristate "QCOM General Serial Bus Interface"
+        depends on ARCH_QCOM
+        help
+          Say y here to enable GSBI support.  The GSBI provides control
+          functions for connecting the underlying serial UART, SPI, and I2C
+          devices to the output pins.
+
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
new file mode 100644
index 000000000000..438901257ac1
--- /dev/null
+++ b/drivers/soc/qcom/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_QCOM_GSBI) +=      qcom_gsbi.o
diff --git a/drivers/soc/qcom/qcom_gsbi.c b/drivers/soc/qcom/qcom_gsbi.c
new file mode 100644
index 000000000000..061dd0632dbd
--- /dev/null
+++ b/drivers/soc/qcom/qcom_gsbi.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2014, The Linux foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License rev 2 and
+ * only rev 2 as published by the free Software foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#define GSBI_CTRL_REG           0x0000
+#define GSBI_PROTOCOL_SHIFT     4
+
+static int gsbi_probe(struct platform_device *pdev)
+{
+        struct device_node *node = pdev->dev.of_node;
+        struct resource *res;
+        void __iomem *base;
+        struct clk *hclk;
+        u32 mode, crci = 0;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(base))
+                return PTR_ERR(base);
+
+        if (of_property_read_u32(node, "qcom,mode", &mode)) {
+                dev_err(&pdev->dev, "missing mode configuration\n");
+                return -EINVAL;
+        }
+
+        /* not required, so default to 0 if not present */
+        of_property_read_u32(node, "qcom,crci", &crci);
+
+        dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", mode, crci);
+
+        hclk = devm_clk_get(&pdev->dev, "iface");
+        if (IS_ERR(hclk))
+                return PTR_ERR(hclk);
+
+        clk_prepare_enable(hclk);
+
+        writel_relaxed((mode << GSBI_PROTOCOL_SHIFT) | crci,
+                                base + GSBI_CTRL_REG);
+
+        /* make sure the gsbi control write is not reordered */
+        wmb();
+
+        clk_disable_unprepare(hclk);
+
+        return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+}
+
+static const struct of_device_id gsbi_dt_match[] = {
+        { .compatible = "qcom,gsbi-v1.0.0", },
+};
+
+MODULE_DEVICE_TABLE(of, gsbi_dt_match);
+
+static struct platform_driver gsbi_driver = {
+        .driver = {
+                .name           = "gsbi",
+                .owner          = THIS_MODULE,
+                .of_match_table = gsbi_dt_match,
+        },
+        .probe = gsbi_probe,
+};
+
+module_platform_driver(gsbi_driver);
+
+MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
+MODULE_DESCRIPTION("QCOM GSBI driver");
+MODULE_LICENSE("GPL v2");