Initial import

3 files changed, 269 insertions, 0 deletions

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
new file mode 100644
index 000000000..460b2dba1
--- /dev/null
+++ b/drivers/soc/qcom/Kconfig
@@ -0,0 +1,12 @@
+#
+# QCOM Soc drivers
+#
+config QCOM_GSBI
+        tristate "QCOM General Serial Bus Interface"
+        depends on ARCH_QCOM
+        select MFD_SYSCON
+        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 000000000..438901257
--- /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 000000000..09c669e70
--- /dev/null
+++ b/drivers/soc/qcom/qcom_gsbi.c
@@ -0,0 +1,256 @@
+/*
+ * 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>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <dt-bindings/soc/qcom,gsbi.h>
+
+#define GSBI_CTRL_REG		0x0000
+#define GSBI_PROTOCOL_SHIFT	4
+#define MAX_GSBI		12
+
+#define TCSR_ADM_CRCI_BASE	0x70
+
+struct crci_config {
+	u32 num_rows;
+	const u32 (*array)[MAX_GSBI];
+};
+
+static const u32 crci_ipq8064[][MAX_GSBI] = {
+	{
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000c00, 0x003000, 0x00c000,
+		0x030000, 0x0c0000, 0x300000, 0xc00000
+	},
+	{
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000c00, 0x003000, 0x00c000,
+		0x030000, 0x0c0000, 0x300000, 0xc00000
+	},
+};
+
+static const struct crci_config config_ipq8064 = {
+	.num_rows = ARRAY_SIZE(crci_ipq8064),
+	.array = crci_ipq8064,
+};
+
+static const unsigned int crci_apq8064[][MAX_GSBI] = {
+	{
+		0x001800, 0x006000, 0x000030, 0x0000c0,
+		0x000300, 0x000400, 0x000000, 0x000000,
+		0x000000, 0x000000, 0x000000, 0x000000
+	},
+	{
+		0x000000, 0x000000, 0x000000, 0x000000,
+		0x000000, 0x000020, 0x0000c0, 0x000000,
+		0x000000, 0x000000, 0x000000, 0x000000
+	},
+};
+
+static const struct crci_config config_apq8064 = {
+	.num_rows = ARRAY_SIZE(crci_apq8064),
+	.array = crci_apq8064,
+};
+
+static const unsigned int crci_msm8960[][MAX_GSBI] = {
+	{
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000400, 0x000000, 0x000000,
+		0x000000, 0x000000, 0x000000, 0x000000
+	},
+	{
+		0x000000, 0x000000, 0x000000, 0x000000,
+		0x000000, 0x000020, 0x0000c0, 0x000300,
+		0x001800, 0x006000, 0x000000, 0x000000
+	},
+};
+
+static const struct crci_config config_msm8960 = {
+	.num_rows = ARRAY_SIZE(crci_msm8960),
+	.array = crci_msm8960,
+};
+
+static const unsigned int crci_msm8660[][MAX_GSBI] = {
+	{	/* ADM 0 - B */
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000c00, 0x003000, 0x00c000,
+		0x030000, 0x0c0000, 0x300000, 0xc00000
+	},
+	{	/* ADM 0 - B */
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000c00, 0x003000, 0x00c000,
+		0x030000, 0x0c0000, 0x300000, 0xc00000
+	},
+	{	/* ADM 1 - A */
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000c00, 0x003000, 0x00c000,
+		0x030000, 0x0c0000, 0x300000, 0xc00000
+	},
+	{	/* ADM 1 - B */
+		0x000003, 0x00000c, 0x000030, 0x0000c0,
+		0x000300, 0x000c00, 0x003000, 0x00c000,
+		0x030000, 0x0c0000, 0x300000, 0xc00000
+	},
+};
+
+static const struct crci_config config_msm8660 = {
+	.num_rows = ARRAY_SIZE(crci_msm8660),
+	.array = crci_msm8660,
+};
+
+struct gsbi_info {
+	struct clk *hclk;
+	u32 mode;
+	u32 crci;
+	struct regmap *tcsr;
+};
+
+static const struct of_device_id tcsr_dt_match[] = {
+	{ .compatible = "qcom,tcsr-ipq8064", .data = &config_ipq8064},
+	{ .compatible = "qcom,tcsr-apq8064", .data = &config_apq8064},
+	{ .compatible = "qcom,tcsr-msm8960", .data = &config_msm8960},
+	{ .compatible = "qcom,tcsr-msm8660", .data = &config_msm8660},
+	{ },
+};
+
+static int gsbi_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct device_node *tcsr_node;
+	const struct of_device_id *match;
+	struct resource *res;
+	void __iomem *base;
+	struct gsbi_info *gsbi;
+	int i;
+	u32 mask, gsbi_num;
+	const struct crci_config *config = NULL;
+
+	gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL);
+
+	if (!gsbi)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	/* get the tcsr node and setup the config and regmap */
+	gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr");
+
+	if (!IS_ERR(gsbi->tcsr)) {
+		tcsr_node = of_parse_phandle(node, "syscon-tcsr", 0);
+		if (tcsr_node) {
+			match = of_match_node(tcsr_dt_match, tcsr_node);
+			if (match)
+				config = match->data;
+			else
+				dev_warn(&pdev->dev, "no matching TCSR\n");
+
+			of_node_put(tcsr_node);
+		}
+	}
+
+	if (of_property_read_u32(node, "cell-index", &gsbi_num)) {
+		dev_err(&pdev->dev, "missing cell-index\n");
+		return -EINVAL;
+	}
+
+	if (gsbi_num < 1 || gsbi_num > MAX_GSBI) {
+		dev_err(&pdev->dev, "invalid cell-index\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32(node, "qcom,mode", &gsbi->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", &gsbi->crci);
+
+	dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n",
+		 gsbi->mode, gsbi->crci);
+	gsbi->hclk = devm_clk_get(&pdev->dev, "iface");
+	if (IS_ERR(gsbi->hclk))
+		return PTR_ERR(gsbi->hclk);
+
+	clk_prepare_enable(gsbi->hclk);
+
+	writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci,
+				base + GSBI_CTRL_REG);
+
+	/*
+	 * modify tcsr to reflect mode and ADM CRCI mux
+	 * Each gsbi contains a pair of bits, one for RX and one for TX
+	 * SPI mode requires both bits cleared, otherwise they are set
+	 */
+	if (config) {
+		for (i = 0; i < config->num_rows; i++) {
+			mask = config->array[i][gsbi_num - 1];
+
+			if (gsbi->mode == GSBI_PROT_SPI)
+				regmap_update_bits(gsbi->tcsr,
+					TCSR_ADM_CRCI_BASE + 4 * i, mask, 0);
+			else
+				regmap_update_bits(gsbi->tcsr,
+					TCSR_ADM_CRCI_BASE + 4 * i, mask, mask);
+
+		}
+	}
+
+	/* make sure the gsbi control write is not reordered */
+	wmb();
+
+	platform_set_drvdata(pdev, gsbi);
+
+	return of_platform_populate(node, NULL, NULL, &pdev->dev);
+}
+
+static int gsbi_remove(struct platform_device *pdev)
+{
+	struct gsbi_info *gsbi = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(gsbi->hclk);
+
+	return 0;
+}
+
+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",
+		.of_match_table	= gsbi_dt_match,
+	},
+	.probe = gsbi_probe,
+	.remove	= gsbi_remove,
+};
+
+module_platform_driver(gsbi_driver);
+
+MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
+MODULE_DESCRIPTION("QCOM GSBI driver");
+MODULE_LICENSE("GPL v2");