| /* |
| * linux/arch/arm/plat-omap/i2c.c |
| * |
| * Helper module for board specific I2C bus registration |
| * |
| * Copyright (C) 2007 Nokia Corporation. |
| * |
| * Contact: Jarkko Nikula <jhnikula@gmail.com> |
| * |
| * 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 |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/platform_device.h> |
| #include <linux/i2c.h> |
| #include <linux/i2c-omap.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/clk.h> |
| |
| #include <mach/irqs.h> |
| |
| #include "../mach-omap1/soc.h" |
| #include "../mach-omap2/soc.h" |
| |
| #include "i2c.h" |
| |
| #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)) |
| |
| static int __init omap_i2c_nr_ports(void) |
| { |
| int ports = 0; |
| |
| if (cpu_class_is_omap1()) |
| ports = 1; |
| else if (cpu_is_omap24xx()) |
| ports = 2; |
| else if (cpu_is_omap34xx()) |
| ports = 3; |
| else if (cpu_is_omap44xx()) |
| ports = 4; |
| |
| return ports; |
| } |
| |
| /** |
| * 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 ports; |
| int ints[3]; |
| |
| ports = omap_i2c_nr_ports(); |
| get_options(str, 3, ints); |
| if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports) |
| 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. |
| */ |
| static 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; |
| } |
| subsys_initcall(omap_register_i2c_bus_cmdline); |
| |
| /** |
| * 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_nr_ports()); |
| |
| 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); |
| } |