342 lines
8.5 KiB
C
342 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Synopsys AXS10X SDP Generic PLL clock driver
|
|
*
|
|
* Copyright (C) 2017 Synopsys
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
|
|
/* PLL registers addresses */
|
|
#define PLL_REG_IDIV 0x0
|
|
#define PLL_REG_FBDIV 0x4
|
|
#define PLL_REG_ODIV 0x8
|
|
|
|
/*
|
|
* Bit fields of the PLL IDIV/FBDIV/ODIV registers:
|
|
* ________________________________________________________________________
|
|
* |31 15| 14 | 13 | 12 |11 6|5 0|
|
|
* |-------RESRVED------|-NOUPDATE-|-BYPASS-|-EDGE-|--HIGHTIME--|--LOWTIME--|
|
|
* |____________________|__________|________|______|____________|___________|
|
|
*
|
|
* Following macros determine the way of access to these registers
|
|
* They should be set up only using the macros.
|
|
* reg should be an u32 variable.
|
|
*/
|
|
|
|
#define PLL_REG_GET_LOW(reg) \
|
|
(((reg) & (0x3F << 0)) >> 0)
|
|
#define PLL_REG_GET_HIGH(reg) \
|
|
(((reg) & (0x3F << 6)) >> 6)
|
|
#define PLL_REG_GET_EDGE(reg) \
|
|
(((reg) & (BIT(12))) ? 1 : 0)
|
|
#define PLL_REG_GET_BYPASS(reg) \
|
|
(((reg) & (BIT(13))) ? 1 : 0)
|
|
#define PLL_REG_GET_NOUPD(reg) \
|
|
(((reg) & (BIT(14))) ? 1 : 0)
|
|
#define PLL_REG_GET_PAD(reg) \
|
|
(((reg) & (0x1FFFF << 15)) >> 15)
|
|
|
|
#define PLL_REG_SET_LOW(reg, value) \
|
|
{ reg |= (((value) & 0x3F) << 0); }
|
|
#define PLL_REG_SET_HIGH(reg, value) \
|
|
{ reg |= (((value) & 0x3F) << 6); }
|
|
#define PLL_REG_SET_EDGE(reg, value) \
|
|
{ reg |= (((value) & 0x01) << 12); }
|
|
#define PLL_REG_SET_BYPASS(reg, value) \
|
|
{ reg |= (((value) & 0x01) << 13); }
|
|
#define PLL_REG_SET_NOUPD(reg, value) \
|
|
{ reg |= (((value) & 0x01) << 14); }
|
|
#define PLL_REG_SET_PAD(reg, value) \
|
|
{ reg |= (((value) & 0x1FFFF) << 15); }
|
|
|
|
#define PLL_LOCK BIT(0)
|
|
#define PLL_ERROR BIT(1)
|
|
#define PLL_MAX_LOCK_TIME 100 /* 100 us */
|
|
|
|
struct axs10x_pll_cfg {
|
|
u32 rate;
|
|
u32 idiv;
|
|
u32 fbdiv;
|
|
u32 odiv;
|
|
};
|
|
|
|
static const struct axs10x_pll_cfg arc_pll_cfg[] = {
|
|
{ 33333333, 1, 1, 1 },
|
|
{ 50000000, 1, 30, 20 },
|
|
{ 75000000, 2, 45, 10 },
|
|
{ 90000000, 2, 54, 10 },
|
|
{ 100000000, 1, 30, 10 },
|
|
{ 125000000, 2, 45, 6 },
|
|
{}
|
|
};
|
|
|
|
static const struct axs10x_pll_cfg pgu_pll_cfg[] = {
|
|
{ 25200000, 1, 84, 90 },
|
|
{ 50000000, 1, 100, 54 },
|
|
{ 74250000, 1, 44, 16 },
|
|
{}
|
|
};
|
|
|
|
struct axs10x_pll_clk {
|
|
struct clk_hw hw;
|
|
void __iomem *base;
|
|
void __iomem *lock;
|
|
const struct axs10x_pll_cfg *pll_cfg;
|
|
struct device *dev;
|
|
};
|
|
|
|
static inline void axs10x_pll_write(struct axs10x_pll_clk *clk, u32 reg,
|
|
u32 val)
|
|
{
|
|
iowrite32(val, clk->base + reg);
|
|
}
|
|
|
|
static inline u32 axs10x_pll_read(struct axs10x_pll_clk *clk, u32 reg)
|
|
{
|
|
return ioread32(clk->base + reg);
|
|
}
|
|
|
|
static inline struct axs10x_pll_clk *to_axs10x_pll_clk(struct clk_hw *hw)
|
|
{
|
|
return container_of(hw, struct axs10x_pll_clk, hw);
|
|
}
|
|
|
|
static inline u32 axs10x_div_get_value(u32 reg)
|
|
{
|
|
if (PLL_REG_GET_BYPASS(reg))
|
|
return 1;
|
|
|
|
return PLL_REG_GET_HIGH(reg) + PLL_REG_GET_LOW(reg);
|
|
}
|
|
|
|
static inline u32 axs10x_encode_div(unsigned int id, int upd)
|
|
{
|
|
u32 div = 0;
|
|
|
|
PLL_REG_SET_LOW(div, (id % 2 == 0) ? id >> 1 : (id >> 1) + 1);
|
|
PLL_REG_SET_HIGH(div, id >> 1);
|
|
PLL_REG_SET_EDGE(div, id % 2);
|
|
PLL_REG_SET_BYPASS(div, id == 1 ? 1 : 0);
|
|
PLL_REG_SET_NOUPD(div, upd == 0 ? 1 : 0);
|
|
|
|
return div;
|
|
}
|
|
|
|
static unsigned long axs10x_pll_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
u64 rate;
|
|
u32 idiv, fbdiv, odiv;
|
|
struct axs10x_pll_clk *clk = to_axs10x_pll_clk(hw);
|
|
|
|
idiv = axs10x_div_get_value(axs10x_pll_read(clk, PLL_REG_IDIV));
|
|
fbdiv = axs10x_div_get_value(axs10x_pll_read(clk, PLL_REG_FBDIV));
|
|
odiv = axs10x_div_get_value(axs10x_pll_read(clk, PLL_REG_ODIV));
|
|
|
|
rate = (u64)parent_rate * fbdiv;
|
|
do_div(rate, idiv * odiv);
|
|
|
|
return rate;
|
|
}
|
|
|
|
static long axs10x_pll_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *prate)
|
|
{
|
|
int i;
|
|
long best_rate;
|
|
struct axs10x_pll_clk *clk = to_axs10x_pll_clk(hw);
|
|
const struct axs10x_pll_cfg *pll_cfg = clk->pll_cfg;
|
|
|
|
if (pll_cfg[0].rate == 0)
|
|
return -EINVAL;
|
|
|
|
best_rate = pll_cfg[0].rate;
|
|
|
|
for (i = 1; pll_cfg[i].rate != 0; i++) {
|
|
if (abs(rate - pll_cfg[i].rate) < abs(rate - best_rate))
|
|
best_rate = pll_cfg[i].rate;
|
|
}
|
|
|
|
return best_rate;
|
|
}
|
|
|
|
static int axs10x_pll_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
int i;
|
|
struct axs10x_pll_clk *clk = to_axs10x_pll_clk(hw);
|
|
const struct axs10x_pll_cfg *pll_cfg = clk->pll_cfg;
|
|
|
|
for (i = 0; pll_cfg[i].rate != 0; i++) {
|
|
if (pll_cfg[i].rate == rate) {
|
|
axs10x_pll_write(clk, PLL_REG_IDIV,
|
|
axs10x_encode_div(pll_cfg[i].idiv, 0));
|
|
axs10x_pll_write(clk, PLL_REG_FBDIV,
|
|
axs10x_encode_div(pll_cfg[i].fbdiv, 0));
|
|
axs10x_pll_write(clk, PLL_REG_ODIV,
|
|
axs10x_encode_div(pll_cfg[i].odiv, 1));
|
|
|
|
/*
|
|
* Wait until CGU relocks and check error status.
|
|
* If after timeout CGU is unlocked yet return error
|
|
*/
|
|
udelay(PLL_MAX_LOCK_TIME);
|
|
if (!(ioread32(clk->lock) & PLL_LOCK))
|
|
return -ETIMEDOUT;
|
|
|
|
if (ioread32(clk->lock) & PLL_ERROR)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
dev_err(clk->dev, "invalid rate=%ld, parent_rate=%ld\n", rate,
|
|
parent_rate);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct clk_ops axs10x_pll_ops = {
|
|
.recalc_rate = axs10x_pll_recalc_rate,
|
|
.round_rate = axs10x_pll_round_rate,
|
|
.set_rate = axs10x_pll_set_rate,
|
|
};
|
|
|
|
static int axs10x_pll_clk_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
const char *parent_name;
|
|
struct axs10x_pll_clk *pll_clk;
|
|
struct clk_init_data init = { };
|
|
int ret;
|
|
|
|
pll_clk = devm_kzalloc(dev, sizeof(*pll_clk), GFP_KERNEL);
|
|
if (!pll_clk)
|
|
return -ENOMEM;
|
|
|
|
pll_clk->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(pll_clk->base))
|
|
return PTR_ERR(pll_clk->base);
|
|
|
|
pll_clk->lock = devm_platform_ioremap_resource(pdev, 1);
|
|
if (IS_ERR(pll_clk->lock))
|
|
return PTR_ERR(pll_clk->lock);
|
|
|
|
init.name = dev->of_node->name;
|
|
init.ops = &axs10x_pll_ops;
|
|
parent_name = of_clk_get_parent_name(dev->of_node, 0);
|
|
init.parent_names = &parent_name;
|
|
init.num_parents = 1;
|
|
pll_clk->hw.init = &init;
|
|
pll_clk->dev = dev;
|
|
pll_clk->pll_cfg = of_device_get_match_data(dev);
|
|
|
|
if (!pll_clk->pll_cfg) {
|
|
dev_err(dev, "No OF match data provided\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = devm_clk_hw_register(dev, &pll_clk->hw);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register %s clock\n", init.name);
|
|
return ret;
|
|
}
|
|
|
|
return of_clk_add_hw_provider(dev->of_node, of_clk_hw_simple_get,
|
|
&pll_clk->hw);
|
|
}
|
|
|
|
static int axs10x_pll_clk_remove(struct platform_device *pdev)
|
|
{
|
|
of_clk_del_provider(pdev->dev.of_node);
|
|
return 0;
|
|
}
|
|
|
|
static void __init of_axs10x_pll_clk_setup(struct device_node *node)
|
|
{
|
|
const char *parent_name;
|
|
struct axs10x_pll_clk *pll_clk;
|
|
struct clk_init_data init = { };
|
|
int ret;
|
|
|
|
pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
|
|
if (!pll_clk)
|
|
return;
|
|
|
|
pll_clk->base = of_iomap(node, 0);
|
|
if (!pll_clk->base) {
|
|
pr_err("failed to map pll div registers\n");
|
|
goto err_free_pll_clk;
|
|
}
|
|
|
|
pll_clk->lock = of_iomap(node, 1);
|
|
if (!pll_clk->lock) {
|
|
pr_err("failed to map pll lock register\n");
|
|
goto err_unmap_base;
|
|
}
|
|
|
|
init.name = node->name;
|
|
init.ops = &axs10x_pll_ops;
|
|
parent_name = of_clk_get_parent_name(node, 0);
|
|
init.parent_names = &parent_name;
|
|
init.num_parents = parent_name ? 1 : 0;
|
|
pll_clk->hw.init = &init;
|
|
pll_clk->pll_cfg = arc_pll_cfg;
|
|
|
|
ret = clk_hw_register(NULL, &pll_clk->hw);
|
|
if (ret) {
|
|
pr_err("failed to register %pOFn clock\n", node);
|
|
goto err_unmap_lock;
|
|
}
|
|
|
|
ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, &pll_clk->hw);
|
|
if (ret) {
|
|
pr_err("failed to add hw provider for %pOFn clock\n", node);
|
|
goto err_unregister_clk;
|
|
}
|
|
|
|
return;
|
|
|
|
err_unregister_clk:
|
|
clk_hw_unregister(&pll_clk->hw);
|
|
err_unmap_lock:
|
|
iounmap(pll_clk->lock);
|
|
err_unmap_base:
|
|
iounmap(pll_clk->base);
|
|
err_free_pll_clk:
|
|
kfree(pll_clk);
|
|
}
|
|
CLK_OF_DECLARE(axs10x_pll_clock, "snps,axs10x-arc-pll-clock",
|
|
of_axs10x_pll_clk_setup);
|
|
|
|
static const struct of_device_id axs10x_pll_clk_id[] = {
|
|
{ .compatible = "snps,axs10x-pgu-pll-clock", .data = &pgu_pll_cfg},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, axs10x_pll_clk_id);
|
|
|
|
static struct platform_driver axs10x_pll_clk_driver = {
|
|
.driver = {
|
|
.name = "axs10x-pll-clock",
|
|
.of_match_table = axs10x_pll_clk_id,
|
|
},
|
|
.probe = axs10x_pll_clk_probe,
|
|
.remove = axs10x_pll_clk_remove,
|
|
};
|
|
builtin_platform_driver(axs10x_pll_clk_driver);
|
|
|
|
MODULE_AUTHOR("Vlad Zakharov <vzakhar@synopsys.com>");
|
|
MODULE_DESCRIPTION("Synopsys AXS10X SDP Generic PLL Clock Driver");
|
|
MODULE_LICENSE("GPL v2");
|