linux/drivers/clk/clk-qoriq.c

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/*
* Copyright 2013 Freescale Semiconductor, Inc.
*
* 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.
*
* clock driver for Freescale QorIQ SoCs.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of.h>
#include <linux/slab.h>
struct cmux_clk {
struct clk_hw hw;
void __iomem *reg;
unsigned int clk_per_pll;
u32 flags;
};
#define PLL_KILL BIT(31)
#define CLKSEL_SHIFT 27
#define CLKSEL_ADJUST BIT(0)
#define to_cmux_clk(p) container_of(p, struct cmux_clk, hw)
static int cmux_set_parent(struct clk_hw *hw, u8 idx)
{
struct cmux_clk *clk = to_cmux_clk(hw);
u32 clksel;
clksel = ((idx / clk->clk_per_pll) << 2) + idx % clk->clk_per_pll;
if (clk->flags & CLKSEL_ADJUST)
clksel += 8;
clksel = (clksel & 0xf) << CLKSEL_SHIFT;
iowrite32be(clksel, clk->reg);
return 0;
}
static u8 cmux_get_parent(struct clk_hw *hw)
{
struct cmux_clk *clk = to_cmux_clk(hw);
u32 clksel;
clksel = ioread32be(clk->reg);
clksel = (clksel >> CLKSEL_SHIFT) & 0xf;
if (clk->flags & CLKSEL_ADJUST)
clksel -= 8;
clksel = (clksel >> 2) * clk->clk_per_pll + clksel % 4;
return clksel;
}
static const struct clk_ops cmux_ops = {
.get_parent = cmux_get_parent,
.set_parent = cmux_set_parent,
};
static void __init core_mux_init(struct device_node *np)
{
struct clk *clk;
struct clk_init_data init;
struct cmux_clk *cmux_clk;
struct device_node *node;
int rc, count, i;
u32 offset;
const char *clk_name;
const char **parent_names;
struct of_phandle_args clkspec;
rc = of_property_read_u32(np, "reg", &offset);
if (rc) {
pr_err("%s: could not get reg property\n", np->name);
return;
}
/* get the input clock source count */
count = of_property_count_strings(np, "clock-names");
if (count < 0) {
pr_err("%s: get clock count error\n", np->name);
return;
}
parent_names = kcalloc(count, sizeof(char *), GFP_KERNEL);
if (!parent_names)
return;
for (i = 0; i < count; i++)
parent_names[i] = of_clk_get_parent_name(np, i);
cmux_clk = kzalloc(sizeof(*cmux_clk), GFP_KERNEL);
if (!cmux_clk)
goto err_name;
cmux_clk->reg = of_iomap(np, 0);
if (!cmux_clk->reg) {
pr_err("%s: could not map register\n", __func__);
goto err_clk;
}
rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", 0,
&clkspec);
if (rc) {
pr_err("%s: parse clock node error\n", __func__);
goto err_clk;
}
cmux_clk->clk_per_pll = of_property_count_strings(clkspec.np,
"clock-output-names");
of_node_put(clkspec.np);
node = of_find_compatible_node(NULL, NULL, "fsl,p4080-clockgen");
if (node && (offset >= 0x80))
cmux_clk->flags = CLKSEL_ADJUST;
rc = of_property_read_string_index(np, "clock-output-names",
0, &clk_name);
if (rc) {
pr_err("%s: read clock names error\n", np->name);
goto err_clk;
}
init.name = clk_name;
init.ops = &cmux_ops;
init.parent_names = parent_names;
init.num_parents = count;
init.flags = 0;
cmux_clk->hw.init = &init;
clk = clk_register(NULL, &cmux_clk->hw);
if (IS_ERR(clk)) {
pr_err("%s: could not register clock\n", clk_name);
goto err_clk;
}
rc = of_clk_add_provider(np, of_clk_src_simple_get, clk);
if (rc) {
pr_err("Could not register clock provider for node:%s\n",
np->name);
goto err_clk;
}
goto err_name;
err_clk:
kfree(cmux_clk);
err_name:
/* free *_names because they are reallocated when registered */
kfree(parent_names);
}
static void __init core_pll_init(struct device_node *np)
{
u32 mult;
int i, rc, count;
const char *clk_name, *parent_name;
struct clk_onecell_data *onecell_data;
struct clk **subclks;
void __iomem *base;
base = of_iomap(np, 0);
if (!base) {
pr_err("iomap error\n");
return;
}
/* get the multiple of PLL */
mult = ioread32be(base);
/* check if this PLL is disabled */
if (mult & PLL_KILL) {
pr_debug("PLL:%s is disabled\n", np->name);
goto err_map;
}
mult = (mult >> 1) & 0x3f;
parent_name = of_clk_get_parent_name(np, 0);
if (!parent_name) {
pr_err("PLL: %s must have a parent\n", np->name);
goto err_map;
}
count = of_property_count_strings(np, "clock-output-names");
if (count < 0 || count > 4) {
pr_err("%s: clock is not supported\n", np->name);
goto err_map;
}
subclks = kcalloc(count, sizeof(struct clk *), GFP_KERNEL);
if (!subclks)
goto err_map;
onecell_data = kmalloc(sizeof(*onecell_data), GFP_KERNEL);
if (!onecell_data)
goto err_clks;
for (i = 0; i < count; i++) {
rc = of_property_read_string_index(np, "clock-output-names",
i, &clk_name);
if (rc) {
pr_err("%s: could not get clock names\n", np->name);
goto err_cell;
}
/*
* when count == 4, there are 4 output clocks:
* /1, /2, /3, /4 respectively
* when count < 4, there are at least 2 output clocks:
* /1, /2, (/4, if count == 3) respectively.
*/
if (count == 4)
subclks[i] = clk_register_fixed_factor(NULL, clk_name,
parent_name, 0, mult, 1 + i);
else
subclks[i] = clk_register_fixed_factor(NULL, clk_name,
parent_name, 0, mult, 1 << i);
if (IS_ERR(subclks[i])) {
pr_err("%s: could not register clock\n", clk_name);
goto err_cell;
}
}
onecell_data->clks = subclks;
onecell_data->clk_num = count;
rc = of_clk_add_provider(np, of_clk_src_onecell_get, onecell_data);
if (rc) {
pr_err("Could not register clk provider for node:%s\n",
np->name);
goto err_cell;
}
iounmap(base);
return;
err_cell:
kfree(onecell_data);
err_clks:
kfree(subclks);
err_map:
iounmap(base);
}
static void __init sysclk_init(struct device_node *node)
{
struct clk *clk;
const char *clk_name = node->name;
struct device_node *np = of_get_parent(node);
u32 rate;
if (!np) {
pr_err("could not get parent node\n");
return;
}
if (of_property_read_u32(np, "clock-frequency", &rate)) {
of_node_put(node);
return;
}
of_property_read_string(np, "clock-output-names", &clk_name);
clk = clk_register_fixed_rate(NULL, clk_name, NULL, CLK_IS_ROOT, rate);
if (!IS_ERR(clk))
of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
static void __init pltfrm_pll_init(struct device_node *np)
{
void __iomem *base;
uint32_t mult;
const char *parent_name, *clk_name;
int i, _errno;
struct clk_onecell_data *cod;
base = of_iomap(np, 0);
if (!base) {
pr_err("%s(): %s: of_iomap() failed\n", __func__, np->name);
return;
}
/* Get the multiple of PLL */
mult = ioread32be(base);
iounmap(base);
/* Check if this PLL is disabled */
if (mult & PLL_KILL) {
pr_debug("%s(): %s: Disabled\n", __func__, np->name);
return;
}
mult = (mult & GENMASK(6, 1)) >> 1;
parent_name = of_clk_get_parent_name(np, 0);
if (!parent_name) {
pr_err("%s(): %s: of_clk_get_parent_name() failed\n",
__func__, np->name);
return;
}
i = of_property_count_strings(np, "clock-output-names");
if (i < 0) {
pr_err("%s(): %s: of_property_count_strings(clock-output-names) = %d\n",
__func__, np->name, i);
return;
}
cod = kmalloc(sizeof(*cod) + i * sizeof(struct clk *), GFP_KERNEL);
if (!cod)
return;
cod->clks = (struct clk **)(cod + 1);
cod->clk_num = i;
for (i = 0; i < cod->clk_num; i++) {
_errno = of_property_read_string_index(np, "clock-output-names",
i, &clk_name);
if (_errno < 0) {
pr_err("%s(): %s: of_property_read_string_index(clock-output-names) = %d\n",
__func__, np->name, _errno);
goto return_clk_unregister;
}
cod->clks[i] = clk_register_fixed_factor(NULL, clk_name,
parent_name, 0, mult, 1 + i);
if (IS_ERR(cod->clks[i])) {
pr_err("%s(): %s: clk_register_fixed_factor(%s) = %ld\n",
__func__, np->name,
clk_name, PTR_ERR(cod->clks[i]));
goto return_clk_unregister;
}
}
_errno = of_clk_add_provider(np, of_clk_src_onecell_get, cod);
if (_errno < 0) {
pr_err("%s(): %s: of_clk_add_provider() = %d\n",
__func__, np->name, _errno);
goto return_clk_unregister;
}
return;
return_clk_unregister:
while (--i >= 0)
clk_unregister(cod->clks[i]);
kfree(cod);
}
CLK_OF_DECLARE(qoriq_sysclk_1, "fsl,qoriq-sysclk-1.0", sysclk_init);
CLK_OF_DECLARE(qoriq_sysclk_2, "fsl,qoriq-sysclk-2.0", sysclk_init);
CLK_OF_DECLARE(qoriq_core_pll_1, "fsl,qoriq-core-pll-1.0", core_pll_init);
CLK_OF_DECLARE(qoriq_core_pll_2, "fsl,qoriq-core-pll-2.0", core_pll_init);
CLK_OF_DECLARE(qoriq_core_mux_1, "fsl,qoriq-core-mux-1.0", core_mux_init);
CLK_OF_DECLARE(qoriq_core_mux_2, "fsl,qoriq-core-mux-2.0", core_mux_init);
CLK_OF_DECLARE(qoriq_pltfrm_pll_1, "fsl,qoriq-platform-pll-1.0", pltfrm_pll_init);
CLK_OF_DECLARE(qoriq_pltfrm_pll_2, "fsl,qoriq-platform-pll-2.0", pltfrm_pll_init);