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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 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 you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Helper module for board specific I2C bus registration
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*
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* Copyright (C) 2009 Nokia Corporation.
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*/
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#include <linux/i2c.h>
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#include <linux/platform_data/i2c-omap.h>
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#include <mach/mux.h>
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#include "soc.h"
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#define OMAP_I2C_SIZE 0x3f
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#define OMAP1_I2C_BASE 0xfffb3800
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static const char name[] = "omap_i2c";
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static struct resource i2c_resources[2] = {
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};
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static struct platform_device omap_i2c_devices[1] = {
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};
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static void __init omap1_i2c_mux_pins(int bus_id)
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{
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if (cpu_is_omap7xx()) {
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omap_cfg_reg(I2C_7XX_SDA);
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omap_cfg_reg(I2C_7XX_SCL);
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} else {
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omap_cfg_reg(I2C_SDA);
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omap_cfg_reg(I2C_SCL);
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}
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}
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int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
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int bus_id)
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{
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struct platform_device *pdev;
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struct resource *res;
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if (bus_id > 1)
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return -EINVAL;
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omap1_i2c_mux_pins(bus_id);
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pdev = &omap_i2c_devices[bus_id - 1];
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pdev->id = bus_id;
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pdev->name = name;
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pdev->num_resources = ARRAY_SIZE(i2c_resources);
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res = i2c_resources;
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res[0].start = OMAP1_I2C_BASE;
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res[0].end = res[0].start + OMAP_I2C_SIZE;
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res[0].flags = IORESOURCE_MEM;
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res[1].start = INT_I2C;
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res[1].flags = IORESOURCE_IRQ;
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pdev->resource = res;
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/* all OMAP1 have IP version 1 register set */
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pdata->rev = OMAP_I2C_IP_VERSION_1;
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/* all OMAP1 I2C are implemented like this */
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pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
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OMAP_I2C_FLAG_SIMPLE_CLOCK |
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OMAP_I2C_FLAG_16BIT_DATA_REG |
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OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
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/* how the cpu bus is wired up differs for 7xx only */
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if (cpu_is_omap7xx())
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pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
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else
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pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
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pdev->dev.platform_data = pdata;
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return platform_device_register(pdev);
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}
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#define OMAP_I2C_MAX_CONTROLLERS 4
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static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
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#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
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/**
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* omap_i2c_bus_setup - Process command line options for the I2C bus speed
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* @str: String of options
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*
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* This function allow to override the default I2C bus speed for given I2C
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* bus with a command line option.
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*
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* Format: i2c_bus=bus_id,clkrate (in kHz)
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*
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* Returns 1 on success, 0 otherwise.
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*/
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static int __init omap_i2c_bus_setup(char *str)
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{
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int ints[3];
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get_options(str, 3, ints);
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if (ints[0] < 2 || ints[1] < 1 ||
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ints[1] > OMAP_I2C_MAX_CONTROLLERS)
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return 0;
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i2c_pdata[ints[1] - 1].clkrate = ints[2];
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i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
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return 1;
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}
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__setup("i2c_bus=", omap_i2c_bus_setup);
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/*
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* Register busses defined in command line but that are not registered with
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* omap_register_i2c_bus from board initialization code.
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*/
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int __init omap_register_i2c_bus_cmdline(void)
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{
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int i, err = 0;
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for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
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if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
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i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
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err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
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if (err)
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goto out;
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}
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out:
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return err;
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}
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/**
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* omap_register_i2c_bus - register I2C bus with device descriptors
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* @bus_id: bus id counting from number 1
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* @clkrate: clock rate of the bus in kHz
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* @info: pointer into I2C device descriptor table or NULL
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* @len: number of descriptors in the table
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*
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* Returns 0 on success or an error code.
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*/
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int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
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struct i2c_board_info const *info,
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unsigned len)
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{
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int err;
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BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);
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if (info) {
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err = i2c_register_board_info(bus_id, info, len);
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if (err)
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return err;
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}
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if (!i2c_pdata[bus_id - 1].clkrate)
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i2c_pdata[bus_id - 1].clkrate = clkrate;
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i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
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return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
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}
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static int __init omap_i2c_cmdline(void)
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{
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return omap_register_i2c_bus_cmdline();
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}
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subsys_initcall(omap_i2c_cmdline);
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