Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 159 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/i2c.c b/arch/arm/mach-omap1/i2c.c
new file mode 100644
index 0000000000..94d3e7883e
--- /dev/null
+++ b/arch/arm/mach-omap1/i2c.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Helper module for board specific I2C bus registration
+ *
+ * Copyright (C) 2009 Nokia Corporation.
+ */
+
+#include <linux/i2c.h>
+#include <linux/platform_data/i2c-omap.h>
+
+#include "mux.h"
+#include "soc.h"
+#include "i2c.h"
+
+#define OMAP_I2C_SIZE		0x3f
+#define OMAP1_I2C_BASE		0xfffb3800
+
+static const char name[] = "omap_i2c";
+
+static struct resource i2c_resources[2] = {
+};
+
+static struct platform_device omap_i2c_devices[1] = {
+};
+
+static void __init omap1_i2c_mux_pins(int bus_id)
+{
+	omap_cfg_reg(I2C_SDA);
+	omap_cfg_reg(I2C_SCL);
+}
+
+int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
+				int bus_id)
+{
+	struct platform_device *pdev;
+	struct resource *res;
+
+	if (bus_id > 1)
+		return -EINVAL;
+
+	omap1_i2c_mux_pins(bus_id);
+
+	pdev = &omap_i2c_devices[bus_id - 1];
+	pdev->id = bus_id;
+	pdev->name = name;
+	pdev->num_resources = ARRAY_SIZE(i2c_resources);
+	res = i2c_resources;
+	res[0].start = OMAP1_I2C_BASE;
+	res[0].end = res[0].start + OMAP_I2C_SIZE;
+	res[0].flags = IORESOURCE_MEM;
+	res[1].start = INT_I2C;
+	res[1].flags = IORESOURCE_IRQ;
+	pdev->resource = res;
+
+	/* all OMAP1 have IP version 1 register set */
+	pdata->rev = OMAP_I2C_IP_VERSION_1;
+
+	/* all OMAP1 I2C are implemented like this */
+	pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
+		       OMAP_I2C_FLAG_SIMPLE_CLOCK |
+		       OMAP_I2C_FLAG_16BIT_DATA_REG |
+		       OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
+
+	/* how the cpu bus is wired up differs for 7xx only */
+
+	pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
+
+	pdev->dev.platform_data = pdata;
+
+	return platform_device_register(pdev);
+}
+
+#define OMAP_I2C_MAX_CONTROLLERS 4
+static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
+
+#define OMAP_I2C_CMDLINE_SETUP	(BIT(31))
+
+/**
+ * omap_i2c_bus_setup - Process command line options for the I2C bus speed
+ * @str: String of options
+ *
+ * This function allow to override the default I2C bus speed for given I2C
+ * bus with a command line option.
+ *
+ * Format: i2c_bus=bus_id,clkrate (in kHz)
+ *
+ * Returns 1 on success, 0 otherwise.
+ */
+static int __init omap_i2c_bus_setup(char *str)
+{
+	int ints[3];
+
+	get_options(str, 3, ints);
+	if (ints[0] < 2 || ints[1] < 1 ||
+			ints[1] > OMAP_I2C_MAX_CONTROLLERS)
+		return 0;
+	i2c_pdata[ints[1] - 1].clkrate = ints[2];
+	i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
+
+	return 1;
+}
+__setup("i2c_bus=", omap_i2c_bus_setup);
+
+/*
+ * Register busses defined in command line but that are not registered with
+ * omap_register_i2c_bus from board initialization code.
+ */
+int __init omap_register_i2c_bus_cmdline(void)
+{
+	int i, err = 0;
+
+	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
+		if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
+			i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
+			err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
+			if (err)
+				goto out;
+		}
+
+out:
+	return err;
+}
+
+/**
+ * omap_register_i2c_bus - register I2C bus with device descriptors
+ * @bus_id: bus id counting from number 1
+ * @clkrate: clock rate of the bus in kHz
+ * @info: pointer into I2C device descriptor table or NULL
+ * @len: number of descriptors in the table
+ *
+ * Returns 0 on success or an error code.
+ */
+int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
+			  struct i2c_board_info const *info,
+			  unsigned len)
+{
+	int err;
+
+	BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);
+
+	if (info) {
+		err = i2c_register_board_info(bus_id, info, len);
+		if (err)
+			return err;
+	}
+
+	if (!i2c_pdata[bus_id - 1].clkrate)
+		i2c_pdata[bus_id - 1].clkrate = clkrate;
+
+	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
+
+	return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
+}
+
+static  int __init omap_i2c_cmdline(void)
+{
+	return omap_register_i2c_bus_cmdline();
+}
+subsys_initcall(omap_i2c_cmdline);