mirror of
https://github.com/torvalds/linux.git
synced 2024-11-13 23:51:39 +00:00
28552c2eae
- Convert data/functions to static - include headers for missing declarations - pointer cleanups: struct foo *__iomem f --> struct foo __iomem *f; Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
295 lines
6.1 KiB
C
295 lines
6.1 KiB
C
/*
|
|
* TI CDCE949 clock synthesizer driver
|
|
*
|
|
* Note: This implementation assumes an input of 27MHz to the CDCE.
|
|
* This is by no means constrained by CDCE hardware although the datasheet
|
|
* does use this as an example for all illustrations and more importantly:
|
|
* that is the crystal input on boards it is currently used on.
|
|
*
|
|
* Copyright (C) 2009 Texas Instruments Incorporated. http://www.ti.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.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/i2c.h>
|
|
|
|
#include <mach/clock.h>
|
|
#include <mach/cdce949.h>
|
|
|
|
#include "clock.h"
|
|
|
|
static struct i2c_client *cdce_i2c_client;
|
|
static DEFINE_MUTEX(cdce_mutex);
|
|
|
|
/* CDCE register descriptor */
|
|
struct cdce_reg {
|
|
u8 addr;
|
|
u8 val;
|
|
};
|
|
|
|
/* Per-Output (Y1, Y2 etc.) frequency descriptor */
|
|
struct cdce_freq {
|
|
/* Frequency in KHz */
|
|
unsigned long frequency;
|
|
/*
|
|
* List of registers to program to obtain a particular frequency.
|
|
* 0x0 in register address and value is the end of list marker.
|
|
*/
|
|
struct cdce_reg *reglist;
|
|
};
|
|
|
|
#define CDCE_FREQ_TABLE_ENTRY(line, out) \
|
|
{ \
|
|
.reglist = cdce_y ##line## _ ##out, \
|
|
.frequency = out, \
|
|
}
|
|
|
|
/* List of CDCE outputs */
|
|
struct cdce_output {
|
|
/* List of frequencies on this output */
|
|
struct cdce_freq *freq_table;
|
|
/* Number of possible frequencies */
|
|
int size;
|
|
};
|
|
|
|
/*
|
|
* Finding out the values to program into CDCE949 registers for a particular
|
|
* frequency output is not a simple calculation. Have a look at the datasheet
|
|
* for the details. There is desktop software available to help users with
|
|
* the calculations. Here, we just depend on the output of that software
|
|
* (or hand calculations) instead trying to runtime calculate the register
|
|
* values and inflicting misery on ourselves.
|
|
*/
|
|
static struct cdce_reg cdce_y1_148500[] = {
|
|
{ 0x13, 0x00 },
|
|
/* program PLL1_0 multiplier */
|
|
{ 0x18, 0xaf },
|
|
{ 0x19, 0x50 },
|
|
{ 0x1a, 0x02 },
|
|
{ 0x1b, 0xc9 },
|
|
/* program PLL1_11 multiplier */
|
|
{ 0x1c, 0x00 },
|
|
{ 0x1d, 0x40 },
|
|
{ 0x1e, 0x02 },
|
|
{ 0x1f, 0xc9 },
|
|
/* output state selection */
|
|
{ 0x15, 0x00 },
|
|
{ 0x14, 0xef },
|
|
/* switch MUX to PLL1 output */
|
|
{ 0x14, 0x6f },
|
|
{ 0x16, 0x06 },
|
|
/* set P2DIV divider, P3DIV and input crystal */
|
|
{ 0x17, 0x06 },
|
|
{ 0x01, 0x00 },
|
|
{ 0x05, 0x48 },
|
|
{ 0x02, 0x80 },
|
|
/* enable and disable PLL */
|
|
{ 0x02, 0xbc },
|
|
{ 0x03, 0x01 },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_reg cdce_y1_74250[] = {
|
|
{ 0x13, 0x00 },
|
|
{ 0x18, 0xaf },
|
|
{ 0x19, 0x50 },
|
|
{ 0x1a, 0x02 },
|
|
{ 0x1b, 0xc9 },
|
|
{ 0x1c, 0x00 },
|
|
{ 0x1d, 0x40 },
|
|
{ 0x1e, 0x02 },
|
|
{ 0x1f, 0xc9 },
|
|
/* output state selection */
|
|
{ 0x15, 0x00 },
|
|
{ 0x14, 0xef },
|
|
/* switch MUX to PLL1 output */
|
|
{ 0x14, 0x6f },
|
|
{ 0x16, 0x06 },
|
|
/* set P2DIV divider, P3DIV and input crystal */
|
|
{ 0x17, 0x06 },
|
|
{ 0x01, 0x00 },
|
|
{ 0x05, 0x48 },
|
|
{ 0x02, 0x80 },
|
|
/* enable and disable PLL */
|
|
{ 0x02, 0xbc },
|
|
{ 0x03, 0x02 },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_reg cdce_y1_27000[] = {
|
|
{ 0x13, 0x00 },
|
|
{ 0x18, 0x00 },
|
|
{ 0x19, 0x40 },
|
|
{ 0x1a, 0x02 },
|
|
{ 0x1b, 0x08 },
|
|
{ 0x1c, 0x00 },
|
|
{ 0x1d, 0x40 },
|
|
{ 0x1e, 0x02 },
|
|
{ 0x1f, 0x08 },
|
|
{ 0x15, 0x02 },
|
|
{ 0x14, 0xed },
|
|
{ 0x16, 0x01 },
|
|
{ 0x17, 0x01 },
|
|
{ 0x01, 0x00 },
|
|
{ 0x05, 0x50 },
|
|
{ 0x02, 0xb4 },
|
|
{ 0x03, 0x01 },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_freq cdce_y1_freqs[] = {
|
|
CDCE_FREQ_TABLE_ENTRY(1, 148500),
|
|
CDCE_FREQ_TABLE_ENTRY(1, 74250),
|
|
CDCE_FREQ_TABLE_ENTRY(1, 27000),
|
|
};
|
|
|
|
static struct cdce_reg cdce_y5_13500[] = {
|
|
{ 0x27, 0x08 },
|
|
{ 0x28, 0x00 },
|
|
{ 0x29, 0x40 },
|
|
{ 0x2a, 0x02 },
|
|
{ 0x2b, 0x08 },
|
|
{ 0x24, 0x6f },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_reg cdce_y5_16875[] = {
|
|
{ 0x27, 0x08 },
|
|
{ 0x28, 0x9f },
|
|
{ 0x29, 0xb0 },
|
|
{ 0x2a, 0x02 },
|
|
{ 0x2b, 0x89 },
|
|
{ 0x24, 0x6f },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_reg cdce_y5_27000[] = {
|
|
{ 0x27, 0x04 },
|
|
{ 0x28, 0x00 },
|
|
{ 0x29, 0x40 },
|
|
{ 0x2a, 0x02 },
|
|
{ 0x2b, 0x08 },
|
|
{ 0x24, 0x6f },
|
|
{ },
|
|
};
|
|
static struct cdce_reg cdce_y5_54000[] = {
|
|
{ 0x27, 0x04 },
|
|
{ 0x28, 0xff },
|
|
{ 0x29, 0x80 },
|
|
{ 0x2a, 0x02 },
|
|
{ 0x2b, 0x07 },
|
|
{ 0x24, 0x6f },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_reg cdce_y5_81000[] = {
|
|
{ 0x27, 0x02 },
|
|
{ 0x28, 0xbf },
|
|
{ 0x29, 0xa0 },
|
|
{ 0x2a, 0x03 },
|
|
{ 0x2b, 0x0a },
|
|
{ 0x24, 0x6f },
|
|
{ },
|
|
};
|
|
|
|
static struct cdce_freq cdce_y5_freqs[] = {
|
|
CDCE_FREQ_TABLE_ENTRY(5, 13500),
|
|
CDCE_FREQ_TABLE_ENTRY(5, 16875),
|
|
CDCE_FREQ_TABLE_ENTRY(5, 27000),
|
|
CDCE_FREQ_TABLE_ENTRY(5, 54000),
|
|
CDCE_FREQ_TABLE_ENTRY(5, 81000),
|
|
};
|
|
|
|
|
|
static struct cdce_output output_list[] = {
|
|
[1] = { cdce_y1_freqs, ARRAY_SIZE(cdce_y1_freqs) },
|
|
[5] = { cdce_y5_freqs, ARRAY_SIZE(cdce_y5_freqs) },
|
|
};
|
|
|
|
int cdce_set_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
int i, ret = 0;
|
|
struct cdce_freq *freq_table = output_list[clk->lpsc].freq_table;
|
|
struct cdce_reg *regs = NULL;
|
|
|
|
if (!cdce_i2c_client)
|
|
return -ENODEV;
|
|
|
|
if (!freq_table)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < output_list[clk->lpsc].size; i++) {
|
|
if (freq_table[i].frequency == rate / 1000) {
|
|
regs = freq_table[i].reglist;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!regs)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&cdce_mutex);
|
|
for (i = 0; regs[i].addr; i++) {
|
|
ret = i2c_smbus_write_byte_data(cdce_i2c_client,
|
|
regs[i].addr | 0x80, regs[i].val);
|
|
if (ret)
|
|
break;
|
|
}
|
|
mutex_unlock(&cdce_mutex);
|
|
|
|
if (!ret)
|
|
clk->rate = rate;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cdce_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
cdce_i2c_client = client;
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit cdce_remove(struct i2c_client *client)
|
|
{
|
|
cdce_i2c_client = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id cdce_id[] = {
|
|
{"cdce949", 0},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, cdce_id);
|
|
|
|
static struct i2c_driver cdce_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "cdce949",
|
|
},
|
|
.probe = cdce_probe,
|
|
.remove = __devexit_p(cdce_remove),
|
|
.id_table = cdce_id,
|
|
};
|
|
|
|
static int __init cdce_init(void)
|
|
{
|
|
return i2c_add_driver(&cdce_driver);
|
|
}
|
|
subsys_initcall(cdce_init);
|
|
|
|
static void __exit cdce_exit(void)
|
|
{
|
|
i2c_del_driver(&cdce_driver);
|
|
}
|
|
module_exit(cdce_exit);
|
|
|
|
MODULE_AUTHOR("Texas Instruments");
|
|
MODULE_DESCRIPTION("CDCE949 clock synthesizer driver");
|
|
MODULE_LICENSE("GPL v2");
|