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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2014 Chen-Yu Tsai
*
* Chen-Yu Tsai <wens@csie.org>
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/log2.h>
#include "clk-factors.h"
/**
* sun9i_a80_get_pll4_factors() - calculates n, p, m factors for PLL4
* PLL4 rate is calculated as follows
* rate = (parent_rate * n >> p) / (m + 1);
* parent_rate is always 24MHz
*
* p and m are named div1 and div2 in Allwinner's SDK
*/
static void sun9i_a80_get_pll4_factors(struct factors_request *req)
{
int n;
int m = 1;
int p = 1;
/* Normalize value to a 6 MHz multiple (24 MHz / 4) */
n = DIV_ROUND_UP(req->rate, 6000000);
/* If n is too large switch to steps of 12 MHz */
if (n > 255) {
m = 0;
n = (n + 1) / 2;
}
/* If n is still too large switch to steps of 24 MHz */
if (n > 255) {
p = 0;
n = (n + 1) / 2;
}
/* n must be between 12 and 255 */
if (n > 255)
n = 255;
else if (n < 12)
n = 12;
req->rate = ((24000000 * n) >> p) / (m + 1);
req->n = n;
req->m = m;
req->p = p;
}
static const struct clk_factors_config sun9i_a80_pll4_config = {
.mshift = 18,
.mwidth = 1,
.nshift = 8,
.nwidth = 8,
.pshift = 16,
.pwidth = 1,
};
static const struct factors_data sun9i_a80_pll4_data __initconst = {
.enable = 31,
.table = &sun9i_a80_pll4_config,
.getter = sun9i_a80_get_pll4_factors,
};
static DEFINE_SPINLOCK(sun9i_a80_pll4_lock);
static void __init sun9i_a80_pll4_setup(struct device_node *node)
{
void __iomem *reg;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg)) {
pr_err("Could not get registers for a80-pll4-clk: %pOFn\n",
node);
return;
}
sunxi_factors_register(node, &sun9i_a80_pll4_data,
&sun9i_a80_pll4_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_pll4, "allwinner,sun9i-a80-pll4-clk", sun9i_a80_pll4_setup);
/**
* sun9i_a80_get_gt_factors() - calculates m factor for GT
* GT rate is calculated as follows
* rate = parent_rate / (m + 1);
*/
static void sun9i_a80_get_gt_factors(struct factors_request *req)
{
u32 div;
if (req->parent_rate < req->rate)
req->rate = req->parent_rate;
div = DIV_ROUND_UP(req->parent_rate, req->rate);
/* maximum divider is 4 */
if (div > 4)
div = 4;
req->rate = req->parent_rate / div;
req->m = div;
}
static const struct clk_factors_config sun9i_a80_gt_config = {
.mshift = 0,
.mwidth = 2,
};
static const struct factors_data sun9i_a80_gt_data __initconst = {
.mux = 24,
.muxmask = BIT(1) | BIT(0),
.table = &sun9i_a80_gt_config,
.getter = sun9i_a80_get_gt_factors,
};
static DEFINE_SPINLOCK(sun9i_a80_gt_lock);
static void __init sun9i_a80_gt_setup(struct device_node *node)
{
void __iomem *reg;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg)) {
pr_err("Could not get registers for a80-gt-clk: %pOFn\n",
node);
return;
}
/* The GT bus clock needs to be always enabled */
sunxi_factors_register_critical(node, &sun9i_a80_gt_data,
&sun9i_a80_gt_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_gt, "allwinner,sun9i-a80-gt-clk", sun9i_a80_gt_setup);
/**
* sun9i_a80_get_ahb_factors() - calculates p factor for AHB0/1/2
* AHB rate is calculated as follows
* rate = parent_rate >> p;
*/
static void sun9i_a80_get_ahb_factors(struct factors_request *req)
{
u32 _p;
if (req->parent_rate < req->rate)
req->rate = req->parent_rate;
_p = order_base_2(DIV_ROUND_UP(req->parent_rate, req->rate));
/* maximum p is 3 */
if (_p > 3)
_p = 3;
req->rate = req->parent_rate >> _p;
req->p = _p;
}
static const struct clk_factors_config sun9i_a80_ahb_config = {
.pshift = 0,
.pwidth = 2,
};
static const struct factors_data sun9i_a80_ahb_data __initconst = {
.mux = 24,
.muxmask = BIT(1) | BIT(0),
.table = &sun9i_a80_ahb_config,
.getter = sun9i_a80_get_ahb_factors,
};
static DEFINE_SPINLOCK(sun9i_a80_ahb_lock);
static void __init sun9i_a80_ahb_setup(struct device_node *node)
{
void __iomem *reg;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg)) {
pr_err("Could not get registers for a80-ahb-clk: %pOFn\n",
node);
return;
}
sunxi_factors_register(node, &sun9i_a80_ahb_data,
&sun9i_a80_ahb_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_ahb, "allwinner,sun9i-a80-ahb-clk", sun9i_a80_ahb_setup);
static const struct factors_data sun9i_a80_apb0_data __initconst = {
.mux = 24,
.muxmask = BIT(0),
.table = &sun9i_a80_ahb_config,
.getter = sun9i_a80_get_ahb_factors,
};
static DEFINE_SPINLOCK(sun9i_a80_apb0_lock);
static void __init sun9i_a80_apb0_setup(struct device_node *node)
{
void __iomem *reg;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg)) {
pr_err("Could not get registers for a80-apb0-clk: %pOFn\n",
node);
return;
}
sunxi_factors_register(node, &sun9i_a80_apb0_data,
&sun9i_a80_apb0_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_apb0, "allwinner,sun9i-a80-apb0-clk", sun9i_a80_apb0_setup);
/**
* sun9i_a80_get_apb1_factors() - calculates m, p factors for APB1
* APB1 rate is calculated as follows
* rate = (parent_rate >> p) / (m + 1);
*/
static void sun9i_a80_get_apb1_factors(struct factors_request *req)
{
u32 div;
if (req->parent_rate < req->rate)
req->rate = req->parent_rate;
div = DIV_ROUND_UP(req->parent_rate, req->rate);
/* Highest possible divider is 256 (p = 3, m = 31) */
if (div > 256)
div = 256;
req->p = order_base_2(div);
req->m = (req->parent_rate >> req->p) - 1;
req->rate = (req->parent_rate >> req->p) / (req->m + 1);
}
static const struct clk_factors_config sun9i_a80_apb1_config = {
.mshift = 0,
.mwidth = 5,
.pshift = 16,
.pwidth = 2,
};
static const struct factors_data sun9i_a80_apb1_data __initconst = {
.mux = 24,
.muxmask = BIT(0),
.table = &sun9i_a80_apb1_config,
.getter = sun9i_a80_get_apb1_factors,
};
static DEFINE_SPINLOCK(sun9i_a80_apb1_lock);
static void __init sun9i_a80_apb1_setup(struct device_node *node)
{
void __iomem *reg;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg)) {
pr_err("Could not get registers for a80-apb1-clk: %pOFn\n",
node);
return;
}
sunxi_factors_register(node, &sun9i_a80_apb1_data,
&sun9i_a80_apb1_lock, reg);
}
CLK_OF_DECLARE(sun9i_a80_apb1, "allwinner,sun9i-a80-apb1-clk", sun9i_a80_apb1_setup);
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