168 lines
3.9 KiB
C
168 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 "mux.h"
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#include "soc.h"
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#include "i2c.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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