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linux_dsm_epyc7002/drivers/clk/clk-plldig.c
Stephen Boyd 0d152f2db5 clk: ls1028a: Fix warning on clamp() usage 
These constants are used in clamp() with the value being clamped an
unsigned long. Make them unsigned long defines so that clamp() doesn't
complain about comparing different types.

In file included from include/linux/list.h:9,
                 from include/linux/kobject.h:19,
                 from include/linux/of.h:17,
                 from include/linux/clk-provider.h:9,
                 from drivers/clk/clk-plldig.c:8:
drivers/clk/clk-plldig.c: In function 'plldig_determine_rate':
include/linux/kernel.h:835:29: warning: comparison of distinct pointer types lacks a cast
  835 |   (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Wen He <wen.he_1@nxp.com>
Fixes: d37010a3c1 ("clk: ls1028a: Add clock driver for Display output interface")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lkml.kernel.org/r/20200203052507.93215-1-sboyd@kernel.org
2020-02-03 10:33:34 -08:00

287 lines
7.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP
*
* Clock driver for LS1028A Display output interfaces(LCD, DPHY).
*/
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/bitfield.h>
/* PLLDIG register offsets and bit masks */
#define PLLDIG_REG_PLLSR 0x24
#define PLLDIG_LOCK_MASK BIT(2)
#define PLLDIG_REG_PLLDV 0x28
#define PLLDIG_MFD_MASK GENMASK(7, 0)
#define PLLDIG_RFDPHI1_MASK GENMASK(30, 25)
#define PLLDIG_REG_PLLFM 0x2c
#define PLLDIG_SSCGBYP_ENABLE BIT(30)
#define PLLDIG_REG_PLLFD 0x30
#define PLLDIG_FDEN BIT(30)
#define PLLDIG_FRAC_MASK GENMASK(15, 0)
#define PLLDIG_REG_PLLCAL1 0x38
#define PLLDIG_REG_PLLCAL2 0x3c
/* Range of the VCO frequencies, in Hz */
#define PLLDIG_MIN_VCO_FREQ 650000000
#define PLLDIG_MAX_VCO_FREQ 1300000000
/* Range of the output frequencies, in Hz */
#define PHI1_MIN_FREQ 27000000UL
#define PHI1_MAX_FREQ 600000000UL
/* Maximum value of the reduced frequency divider */
#define MAX_RFDPHI1 63UL
/* Best value of multiplication factor divider */
#define PLLDIG_DEFAULT_MFD 44
/*
* Denominator part of the fractional part of the
* loop multiplication factor.
*/
#define MFDEN 20480
static const struct clk_parent_data parent_data[] = {
{ .index = 0 },
};
struct clk_plldig {
struct clk_hw hw;
void __iomem *regs;
unsigned int vco_freq;
};
#define to_clk_plldig(_hw) container_of(_hw, struct clk_plldig, hw)
static int plldig_enable(struct clk_hw *hw)
{
struct clk_plldig *data = to_clk_plldig(hw);
u32 val;
val = readl(data->regs + PLLDIG_REG_PLLFM);
/*
* Use Bypass mode with PLL off by default, the frequency overshoot
* detector output was disable. SSCG Bypass mode should be enable.
*/
val |= PLLDIG_SSCGBYP_ENABLE;
writel(val, data->regs + PLLDIG_REG_PLLFM);
return 0;
}
static void plldig_disable(struct clk_hw *hw)
{
struct clk_plldig *data = to_clk_plldig(hw);
u32 val;
val = readl(data->regs + PLLDIG_REG_PLLFM);
val &= ~PLLDIG_SSCGBYP_ENABLE;
val |= FIELD_PREP(PLLDIG_SSCGBYP_ENABLE, 0x0);
writel(val, data->regs + PLLDIG_REG_PLLFM);
}
static int plldig_is_enabled(struct clk_hw *hw)
{
struct clk_plldig *data = to_clk_plldig(hw);
return readl(data->regs + PLLDIG_REG_PLLFM) &
PLLDIG_SSCGBYP_ENABLE;
}
static unsigned long plldig_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_plldig *data = to_clk_plldig(hw);
u32 val, rfdphi1;
val = readl(data->regs + PLLDIG_REG_PLLDV);
/* Check if PLL is bypassed */
if (val & PLLDIG_SSCGBYP_ENABLE)
return parent_rate;
rfdphi1 = FIELD_GET(PLLDIG_RFDPHI1_MASK, val);
/*
* If RFDPHI1 has a value of 1 the VCO frequency is also divided by
* one.
*/
if (!rfdphi1)
rfdphi1 = 1;
return DIV_ROUND_UP(data->vco_freq, rfdphi1);
}
static unsigned long plldig_calc_target_div(unsigned long vco_freq,
unsigned long target_rate)
{
unsigned long div;
div = DIV_ROUND_CLOSEST(vco_freq, target_rate);
div = clamp(div, 1UL, MAX_RFDPHI1);
return div;
}
static int plldig_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct clk_plldig *data = to_clk_plldig(hw);
unsigned int div;
req->rate = clamp(req->rate, PHI1_MIN_FREQ, PHI1_MAX_FREQ);
div = plldig_calc_target_div(data->vco_freq, req->rate);
req->rate = DIV_ROUND_UP(data->vco_freq, div);
return 0;
}
static int plldig_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_plldig *data = to_clk_plldig(hw);
unsigned int val, cond;
unsigned int rfdphi1;
rate = clamp(rate, PHI1_MIN_FREQ, PHI1_MAX_FREQ);
rfdphi1 = plldig_calc_target_div(data->vco_freq, rate);
/* update the divider value */
val = readl(data->regs + PLLDIG_REG_PLLDV);
val &= ~PLLDIG_RFDPHI1_MASK;
val |= FIELD_PREP(PLLDIG_RFDPHI1_MASK, rfdphi1);
writel(val, data->regs + PLLDIG_REG_PLLDV);
/* waiting for old lock state to clear */
udelay(200);
/* Wait until PLL is locked or timeout */
return readl_poll_timeout_atomic(data->regs + PLLDIG_REG_PLLSR, cond,
cond & PLLDIG_LOCK_MASK, 0,
USEC_PER_MSEC);
}
static const struct clk_ops plldig_clk_ops = {
.enable = plldig_enable,
.disable = plldig_disable,
.is_enabled = plldig_is_enabled,
.recalc_rate = plldig_recalc_rate,
.determine_rate = plldig_determine_rate,
.set_rate = plldig_set_rate,
};
static int plldig_init(struct clk_hw *hw)
{
struct clk_plldig *data = to_clk_plldig(hw);
struct clk_hw *parent = clk_hw_get_parent(hw);
unsigned long parent_rate = clk_hw_get_rate(parent);
unsigned long val;
unsigned long long lltmp;
unsigned int mfd, fracdiv = 0;
if (!parent)
return -EINVAL;
if (data->vco_freq) {
mfd = data->vco_freq / parent_rate;
lltmp = data->vco_freq % parent_rate;
lltmp *= MFDEN;
do_div(lltmp, parent_rate);
fracdiv = lltmp;
} else {
mfd = PLLDIG_DEFAULT_MFD;
data->vco_freq = parent_rate * mfd;
}
val = FIELD_PREP(PLLDIG_MFD_MASK, mfd);
writel(val, data->regs + PLLDIG_REG_PLLDV);
/* Enable fractional divider */
if (fracdiv) {
val = FIELD_PREP(PLLDIG_FRAC_MASK, fracdiv);
val |= PLLDIG_FDEN;
writel(val, data->regs + PLLDIG_REG_PLLFD);
}
return 0;
}
static int plldig_clk_probe(struct platform_device *pdev)
{
struct clk_plldig *data;
struct device *dev = &pdev->dev;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->regs))
return PTR_ERR(data->regs);
data->hw.init = CLK_HW_INIT_PARENTS_DATA("dpclk",
parent_data,
&plldig_clk_ops,
0);
ret = devm_clk_hw_register(dev, &data->hw);
if (ret) {
dev_err(dev, "failed to register %s clock\n",
dev->of_node->name);
return ret;
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
&data->hw);
if (ret) {
dev_err(dev, "unable to add clk provider\n");
return ret;
}
/*
* The frequency of the VCO cannot be changed during runtime.
* Therefore, let the user specify a desired frequency.
*/
if (!of_property_read_u32(dev->of_node, "fsl,vco-hz",
&data->vco_freq)) {
if (data->vco_freq < PLLDIG_MIN_VCO_FREQ ||
data->vco_freq > PLLDIG_MAX_VCO_FREQ)
return -EINVAL;
}
return plldig_init(&data->hw);
}
static const struct of_device_id plldig_clk_id[] = {
{ .compatible = "fsl,ls1028a-plldig" },
{ }
};
MODULE_DEVICE_TABLE(of, plldig_clk_id);
static struct platform_driver plldig_clk_driver = {
.driver = {
.name = "plldig-clock",
.of_match_table = plldig_clk_id,
},
.probe = plldig_clk_probe,
};
module_platform_driver(plldig_clk_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Wen He <wen.he_1@nxp.com>");
MODULE_DESCRIPTION("LS1028A Display output interface pixel clock driver");
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