clk-impd1.c
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/*
* Clock driver for the ARM Integrator/IM-PD1 board
* Copyright (C) 2012-2013 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/clkdev.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_data/clk-integrator.h>
#include "clk-icst.h"
#define IMPD1_OSC1 0x00
#define IMPD1_OSC2 0x04
#define IMPD1_LOCK 0x08
struct impd1_clk {
char *pclkname;
struct clk *pclk;
char *vco1name;
struct clk *vco1clk;
char *vco2name;
struct clk *vco2clk;
struct clk *mmciclk;
char *uartname;
struct clk *uartclk;
char *spiname;
struct clk *spiclk;
char *scname;
struct clk *scclk;
struct clk_lookup *clks[15];
};
/* One entry for each connected IM-PD1 LM */
static struct impd1_clk impd1_clks[4];
/*
* There are two VCO's on the IM-PD1
*/
static const struct icst_params impd1_vco1_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_vco1_params,
.vco_offset = IMPD1_OSC1,
.lock_offset = IMPD1_LOCK,
};
static const struct icst_params impd1_vco2_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_icst2_desc = {
.params = &impd1_vco2_params,
.vco_offset = IMPD1_OSC2,
.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;
struct clk *pclk;
int i;
if (id > 3) {
pr_crit("no more than 4 LMs can be attached\n");
return;
}
imc = &impd1_clks[id];
/* Register the fixed rate PCLK */
imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id);
pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL,
CLK_IS_ROOT, 0);
imc->pclk = pclk;
imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
base);
imc->vco1clk = clk;
imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id);
imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
/* VCO2 is also called "CLK2" */
imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
base);
imc->vco2clk = clk;
/* MMCI uses CLK2 right off */
imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id);
imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
/* UART reference clock divides CLK2 by a fixed factor 4 */
imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
CLK_IGNORE_UNUSED, 1, 4);
imc->uartclk = clk;
imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id);
imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id);
imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
/* SPI PL022 clock divides CLK2 by a fixed factor 64 */
imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
CLK_IGNORE_UNUSED, 1, 64);
imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id);
imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
/* The GPIO blocks and AACI have only PCLK */
imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id);
imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id);
imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id);
/* Smart Card clock divides CLK2 by a fixed factor 4 */
imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
CLK_IGNORE_UNUSED, 1, 4);
imc->scclk = clk;
imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id);
imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
clkdev_add(imc->clks[i]);
}
EXPORT_SYMBOL_GPL(integrator_impd1_clk_init);
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->spiclk);
clk_unregister(imc->uartclk);
clk_unregister(imc->vco2clk);
clk_unregister(imc->vco1clk);
clk_unregister(imc->pclk);
kfree(imc->scname);
kfree(imc->spiname);
kfree(imc->uartname);
kfree(imc->vco2name);
kfree(imc->vco1name);
kfree(imc->pclkname);
}
EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit);