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162 lines
4.7 KiB
162 lines
4.7 KiB
From a2f0fc20ea49e5dbbdbb21444683ea760fbdd38f Mon Sep 17 00:00:00 2001
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From: Andy Gross <agross@codeaurora.org>
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Date: Thu, 24 Apr 2014 11:31:21 -0500
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Subject: [PATCH 084/182] soc: qcom: Add GSBI driver
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The GSBI (General Serial Bus Interface) driver controls the overarching
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configuration of the shared serial bus infrastructure on APQ8064, IPQ8064, and
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earlier QCOM processors. The GSBI supports UART, I2C, SPI, and UIM
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functionality in various combinations.
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Signed-off-by: Andy Gross <agross@codeaurora.org>
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Signed-off-by: Kumar Gala <galak@codeaurora.org>
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---
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drivers/soc/Kconfig | 2 +
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drivers/soc/Makefile | 5 +++
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drivers/soc/qcom/Kconfig | 11 ++++++
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drivers/soc/qcom/Makefile | 1 +
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drivers/soc/qcom/qcom_gsbi.c | 84 ++++++++++++++++++++++++++++++++++++++++++
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5 files changed, 103 insertions(+)
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create mode 100644 drivers/soc/Makefile
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create mode 100644 drivers/soc/qcom/Kconfig
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create mode 100644 drivers/soc/qcom/Makefile
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create mode 100644 drivers/soc/qcom/qcom_gsbi.c
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diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
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index 339baa8..c854385 100644
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--- a/drivers/soc/Kconfig
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+++ b/drivers/soc/Kconfig
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@@ -1,3 +1,5 @@
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menu "SOC (System On Chip) specific Drivers"
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+source "drivers/soc/qcom/Kconfig"
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+
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endmenu
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diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
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new file mode 100644
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index 0000000..0f7c447
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--- /dev/null
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+++ b/drivers/soc/Makefile
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@@ -0,0 +1,5 @@
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+#
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+# Makefile for the Linux Kernel SOC specific device drivers.
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+#
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+
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+obj-$(CONFIG_ARCH_QCOM) += qcom/
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diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
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new file mode 100644
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index 0000000..7bd2c94
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--- /dev/null
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+++ b/drivers/soc/qcom/Kconfig
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@@ -0,0 +1,11 @@
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+#
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+# QCOM Soc drivers
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+#
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+config QCOM_GSBI
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+ tristate "QCOM General Serial Bus Interface"
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+ depends on ARCH_QCOM
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+ help
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+ Say y here to enable GSBI support. The GSBI provides control
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+ functions for connecting the underlying serial UART, SPI, and I2C
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+ devices to the output pins.
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+
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diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
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new file mode 100644
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index 0000000..4389012
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--- /dev/null
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+++ b/drivers/soc/qcom/Makefile
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@@ -0,0 +1 @@
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+obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
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diff --git a/drivers/soc/qcom/qcom_gsbi.c b/drivers/soc/qcom/qcom_gsbi.c
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new file mode 100644
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index 0000000..061dd06
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--- /dev/null
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+++ b/drivers/soc/qcom/qcom_gsbi.c
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@@ -0,0 +1,84 @@
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+/*
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+ * Copyright (c) 2014, The Linux foundation. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License rev 2 and
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+ * only rev 2 as published by the free Software foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_platform.h>
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+#include <linux/platform_device.h>
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+
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+#define GSBI_CTRL_REG 0x0000
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+#define GSBI_PROTOCOL_SHIFT 4
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+
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+static int gsbi_probe(struct platform_device *pdev)
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+{
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+ struct device_node *node = pdev->dev.of_node;
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+ struct resource *res;
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+ void __iomem *base;
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+ struct clk *hclk;
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+ u32 mode, crci = 0;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ base = devm_ioremap_resource(&pdev->dev, res);
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+ if (IS_ERR(base))
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+ return PTR_ERR(base);
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+
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+ if (of_property_read_u32(node, "qcom,mode", &mode)) {
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+ dev_err(&pdev->dev, "missing mode configuration\n");
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+ return -EINVAL;
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+ }
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+
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+ /* not required, so default to 0 if not present */
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+ of_property_read_u32(node, "qcom,crci", &crci);
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+
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+ dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", mode, crci);
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+
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+ hclk = devm_clk_get(&pdev->dev, "iface");
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+ if (IS_ERR(hclk))
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+ return PTR_ERR(hclk);
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+
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+ clk_prepare_enable(hclk);
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+
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+ writel_relaxed((mode << GSBI_PROTOCOL_SHIFT) | crci,
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+ base + GSBI_CTRL_REG);
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+
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+ /* make sure the gsbi control write is not reordered */
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+ wmb();
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+
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+ clk_disable_unprepare(hclk);
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+
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+ return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
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+}
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+
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+static const struct of_device_id gsbi_dt_match[] = {
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+ { .compatible = "qcom,gsbi-v1.0.0", },
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+};
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+
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+MODULE_DEVICE_TABLE(of, gsbi_dt_match);
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+
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+static struct platform_driver gsbi_driver = {
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+ .driver = {
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+ .name = "gsbi",
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+ .owner = THIS_MODULE,
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+ .of_match_table = gsbi_dt_match,
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+ },
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+ .probe = gsbi_probe,
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+};
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+
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+module_platform_driver(gsbi_driver);
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+
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+MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
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+MODULE_DESCRIPTION("QCOM GSBI driver");
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+MODULE_LICENSE("GPL v2");
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--
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1.7.10.4
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