98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
|
|
* Clock driver for the ARM Integrator/IM-PD1 board
|
|
* Copyright (C) 2012 Linus Walleij
|
|
*
|
|
* 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/clk-provider.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/clkdev.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/platform_data/clk-integrator.h>
|
|
|
|
#include <mach/impd1.h>
|
|
|
|
#include "clk-icst.h"
|
|
|
|
struct impd1_clk {
|
|
struct clk *vcoclk;
|
|
struct clk *uartclk;
|
|
struct clk_lookup *clks[3];
|
|
};
|
|
|
|
static struct impd1_clk impd1_clks[4];
|
|
|
|
/*
|
|
* There are two VCO's on the IM-PD1 but only one is used by the
|
|
* kernel, that is why we are only implementing the control of
|
|
* IMPD1_OSC1 here.
|
|
*/
|
|
|
|
static const struct icst_params impd1_vco_params = {
|
|
.ref = 24000000, /* 24 MHz */
|
|
.vco_max = ICST525_VCO_MAX_3V,
|
|
.vco_min = ICST525_VCO_MIN,
|
|
.vd_min = 12,
|
|
.vd_max = 519,
|
|
.rd_min = 3,
|
|
.rd_max = 120,
|
|
.s2div = icst525_s2div,
|
|
.idx2s = icst525_idx2s,
|
|
};
|
|
|
|
static const struct clk_icst_desc impd1_icst1_desc = {
|
|
.params = &impd1_vco_params,
|
|
.vco_offset = IMPD1_OSC1,
|
|
.lock_offset = IMPD1_LOCK,
|
|
};
|
|
|
|
/**
|
|
* integrator_impd1_clk_init() - set up the integrator clock tree
|
|
* @base: base address of the logic module (LM)
|
|
* @id: the ID of this LM
|
|
*/
|
|
void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
|
|
{
|
|
struct impd1_clk *imc;
|
|
struct clk *clk;
|
|
int i;
|
|
|
|
if (id > 3) {
|
|
pr_crit("no more than 4 LMs can be attached\n");
|
|
return;
|
|
}
|
|
imc = &impd1_clks[id];
|
|
|
|
clk = icst_clk_register(NULL, &impd1_icst1_desc, base);
|
|
imc->vcoclk = clk;
|
|
imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
|
|
|
|
/* UART reference clock */
|
|
clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT,
|
|
14745600);
|
|
imc->uartclk = clk;
|
|
imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
|
|
imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
|
|
clkdev_add(imc->clks[i]);
|
|
}
|
|
|
|
void integrator_impd1_clk_exit(unsigned int id)
|
|
{
|
|
int i;
|
|
struct impd1_clk *imc;
|
|
|
|
if (id > 3)
|
|
return;
|
|
imc = &impd1_clks[id];
|
|
|
|
for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
|
|
clkdev_drop(imc->clks[i]);
|
|
clk_unregister(imc->uartclk);
|
|
clk_unregister(imc->vcoclk);
|
|
}
|