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