linux/drivers/clk/clk-zynq.c

384 lines
9.3 KiB
C

/*
* Copyright (c) 2012 National Instruments
*
* Josh Cartwright <josh.cartwright@ni.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/clk-provider.h>
static void __iomem *slcr_base;
struct zynq_pll_clk {
struct clk_hw hw;
void __iomem *pll_ctrl;
void __iomem *pll_cfg;
};
#define to_zynq_pll_clk(hw) container_of(hw, struct zynq_pll_clk, hw)
#define CTRL_PLL_FDIV(x) ((x) >> 12)
static unsigned long zynq_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct zynq_pll_clk *pll = to_zynq_pll_clk(hw);
return parent_rate * CTRL_PLL_FDIV(ioread32(pll->pll_ctrl));
}
static const struct clk_ops zynq_pll_clk_ops = {
.recalc_rate = zynq_pll_recalc_rate,
};
static void __init zynq_pll_clk_setup(struct device_node *np)
{
struct clk_init_data init;
struct zynq_pll_clk *pll;
const char *parent_name;
struct clk *clk;
u32 regs[2];
int ret;
ret = of_property_read_u32_array(np, "reg", regs, ARRAY_SIZE(regs));
if (WARN_ON(ret))
return;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (WARN_ON(!pll))
return;
pll->pll_ctrl = slcr_base + regs[0];
pll->pll_cfg = slcr_base + regs[1];
of_property_read_string(np, "clock-output-names", &init.name);
init.ops = &zynq_pll_clk_ops;
parent_name = of_clk_get_parent_name(np, 0);
init.parent_names = &parent_name;
init.num_parents = 1;
pll->hw.init = &init;
clk = clk_register(NULL, &pll->hw);
if (WARN_ON(IS_ERR(clk)))
return;
ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
if (WARN_ON(ret))
return;
}
struct zynq_periph_clk {
struct clk_hw hw;
struct clk_onecell_data onecell_data;
struct clk *gates[2];
void __iomem *clk_ctrl;
spinlock_t clkact_lock;
};
#define to_zynq_periph_clk(hw) container_of(hw, struct zynq_periph_clk, hw)
static const u8 periph_clk_parent_map[] = {
0, 0, 1, 2
};
#define PERIPH_CLK_CTRL_SRC(x) (periph_clk_parent_map[((x) & 0x30) >> 4])
#define PERIPH_CLK_CTRL_DIV(x) (((x) & 0x3F00) >> 8)
static unsigned long zynq_periph_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct zynq_periph_clk *periph = to_zynq_periph_clk(hw);
return parent_rate / PERIPH_CLK_CTRL_DIV(ioread32(periph->clk_ctrl));
}
static u8 zynq_periph_get_parent(struct clk_hw *hw)
{
struct zynq_periph_clk *periph = to_zynq_periph_clk(hw);
return PERIPH_CLK_CTRL_SRC(ioread32(periph->clk_ctrl));
}
static const struct clk_ops zynq_periph_clk_ops = {
.recalc_rate = zynq_periph_recalc_rate,
.get_parent = zynq_periph_get_parent,
};
static void __init zynq_periph_clk_setup(struct device_node *np)
{
struct zynq_periph_clk *periph;
const char *parent_names[3];
struct clk_init_data init;
int clk_num = 0, err;
const char *name;
struct clk *clk;
u32 reg;
int i;
err = of_property_read_u32(np, "reg", &reg);
if (WARN_ON(err))
return;
periph = kzalloc(sizeof(*periph), GFP_KERNEL);
if (WARN_ON(!periph))
return;
periph->clk_ctrl = slcr_base + reg;
spin_lock_init(&periph->clkact_lock);
init.name = np->name;
init.ops = &zynq_periph_clk_ops;
for (i = 0; i < ARRAY_SIZE(parent_names); i++)
parent_names[i] = of_clk_get_parent_name(np, i);
init.parent_names = parent_names;
init.num_parents = ARRAY_SIZE(parent_names);
periph->hw.init = &init;
clk = clk_register(NULL, &periph->hw);
if (WARN_ON(IS_ERR(clk)))
return;
err = of_clk_add_provider(np, of_clk_src_simple_get, clk);
if (WARN_ON(err))
return;
err = of_property_read_string_index(np, "clock-output-names", 0,
&name);
if (WARN_ON(err))
return;
periph->gates[0] = clk_register_gate(NULL, name, np->name, 0,
periph->clk_ctrl, 0, 0,
&periph->clkact_lock);
if (WARN_ON(IS_ERR(periph->gates[0])))
return;
clk_num++;
/* some periph clks have 2 downstream gates */
err = of_property_read_string_index(np, "clock-output-names", 1,
&name);
if (err != -ENODATA) {
periph->gates[1] = clk_register_gate(NULL, name, np->name, 0,
periph->clk_ctrl, 1, 0,
&periph->clkact_lock);
if (WARN_ON(IS_ERR(periph->gates[1])))
return;
clk_num++;
}
periph->onecell_data.clks = periph->gates;
periph->onecell_data.clk_num = clk_num;
err = of_clk_add_provider(np, of_clk_src_onecell_get,
&periph->onecell_data);
if (WARN_ON(err))
return;
}
/* CPU Clock domain is modelled as a mux with 4 children subclks, whose
* derivative rates depend on CLK_621_TRUE
*/
struct zynq_cpu_clk {
struct clk_hw hw;
struct clk_onecell_data onecell_data;
struct clk *subclks[4];
void __iomem *clk_ctrl;
spinlock_t clkact_lock;
};
#define to_zynq_cpu_clk(hw) container_of(hw, struct zynq_cpu_clk, hw)
static const u8 zynq_cpu_clk_parent_map[] = {
1, 1, 2, 0
};
#define CPU_CLK_SRCSEL(x) (zynq_cpu_clk_parent_map[(((x) & 0x30) >> 4)])
#define CPU_CLK_CTRL_DIV(x) (((x) & 0x3F00) >> 8)
static u8 zynq_cpu_clk_get_parent(struct clk_hw *hw)
{
struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(hw);
return CPU_CLK_SRCSEL(ioread32(cpuclk->clk_ctrl));
}
static unsigned long zynq_cpu_clk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(hw);
return parent_rate / CPU_CLK_CTRL_DIV(ioread32(cpuclk->clk_ctrl));
}
static const struct clk_ops zynq_cpu_clk_ops = {
.get_parent = zynq_cpu_clk_get_parent,
.recalc_rate = zynq_cpu_clk_recalc_rate,
};
struct zynq_cpu_subclk {
struct clk_hw hw;
void __iomem *clk_621;
enum {
CPU_SUBCLK_6X4X,
CPU_SUBCLK_3X2X,
CPU_SUBCLK_2X,
CPU_SUBCLK_1X,
} which;
};
#define CLK_621_TRUE(x) ((x) & 1)
#define to_zynq_cpu_subclk(hw) container_of(hw, struct zynq_cpu_subclk, hw);
static unsigned long zynq_cpu_subclk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
unsigned long uninitialized_var(rate);
struct zynq_cpu_subclk *subclk;
bool is_621;
subclk = to_zynq_cpu_subclk(hw)
is_621 = CLK_621_TRUE(ioread32(subclk->clk_621));
switch (subclk->which) {
case CPU_SUBCLK_6X4X:
rate = parent_rate;
break;
case CPU_SUBCLK_3X2X:
rate = parent_rate / 2;
break;
case CPU_SUBCLK_2X:
rate = parent_rate / (is_621 ? 3 : 2);
break;
case CPU_SUBCLK_1X:
rate = parent_rate / (is_621 ? 6 : 4);
break;
};
return rate;
}
static const struct clk_ops zynq_cpu_subclk_ops = {
.recalc_rate = zynq_cpu_subclk_recalc_rate,
};
static struct clk *zynq_cpu_subclk_setup(struct device_node *np, u8 which,
void __iomem *clk_621)
{
struct zynq_cpu_subclk *subclk;
struct clk_init_data init;
struct clk *clk;
int err;
err = of_property_read_string_index(np, "clock-output-names",
which, &init.name);
if (WARN_ON(err))
goto err_read_output_name;
subclk = kzalloc(sizeof(*subclk), GFP_KERNEL);
if (!subclk)
goto err_subclk_alloc;
subclk->clk_621 = clk_621;
subclk->which = which;
init.ops = &zynq_cpu_subclk_ops;
init.parent_names = &np->name;
init.num_parents = 1;
subclk->hw.init = &init;
clk = clk_register(NULL, &subclk->hw);
if (WARN_ON(IS_ERR(clk)))
goto err_clk_register;
return clk;
err_clk_register:
kfree(subclk);
err_subclk_alloc:
err_read_output_name:
return ERR_PTR(-EINVAL);
}
static void __init zynq_cpu_clk_setup(struct device_node *np)
{
struct zynq_cpu_clk *cpuclk;
const char *parent_names[3];
struct clk_init_data init;
void __iomem *clk_621;
struct clk *clk;
u32 reg[2];
int err;
int i;
err = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg));
if (WARN_ON(err))
return;
cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
if (WARN_ON(!cpuclk))
return;
cpuclk->clk_ctrl = slcr_base + reg[0];
clk_621 = slcr_base + reg[1];
spin_lock_init(&cpuclk->clkact_lock);
init.name = np->name;
init.ops = &zynq_cpu_clk_ops;
for (i = 0; i < ARRAY_SIZE(parent_names); i++)
parent_names[i] = of_clk_get_parent_name(np, i);
init.parent_names = parent_names;
init.num_parents = ARRAY_SIZE(parent_names);
cpuclk->hw.init = &init;
clk = clk_register(NULL, &cpuclk->hw);
if (WARN_ON(IS_ERR(clk)))
return;
err = of_clk_add_provider(np, of_clk_src_simple_get, clk);
if (WARN_ON(err))
return;
for (i = 0; i < 4; i++) {
cpuclk->subclks[i] = zynq_cpu_subclk_setup(np, i, clk_621);
if (WARN_ON(IS_ERR(cpuclk->subclks[i])))
return;
}
cpuclk->onecell_data.clks = cpuclk->subclks;
cpuclk->onecell_data.clk_num = i;
err = of_clk_add_provider(np, of_clk_src_onecell_get,
&cpuclk->onecell_data);
if (WARN_ON(err))
return;
}
static const __initconst struct of_device_id zynq_clk_match[] = {
{ .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
{ .compatible = "xlnx,zynq-pll", .data = zynq_pll_clk_setup, },
{ .compatible = "xlnx,zynq-periph-clock",
.data = zynq_periph_clk_setup, },
{ .compatible = "xlnx,zynq-cpu-clock", .data = zynq_cpu_clk_setup, },
{}
};
void __init xilinx_zynq_clocks_init(void __iomem *slcr)
{
slcr_base = slcr;
of_clk_init(zynq_clk_match);
}