423 lines
9.8 KiB
C
423 lines
9.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include "pmc.h"
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#define SAM9X5_USB_DIV_SHIFT 8
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#define SAM9X5_USB_MAX_DIV 0xf
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#define RM9200_USB_DIV_SHIFT 28
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#define RM9200_USB_DIV_TAB_SIZE 4
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#define SAM9X5_USBS_MASK GENMASK(0, 0)
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#define SAM9X60_USBS_MASK GENMASK(1, 0)
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struct at91sam9x5_clk_usb {
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struct clk_hw hw;
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struct regmap *regmap;
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struct at91_clk_pms pms;
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u32 usbs_mask;
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u8 num_parents;
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};
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#define to_at91sam9x5_clk_usb(hw) \
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container_of(hw, struct at91sam9x5_clk_usb, hw)
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struct at91rm9200_clk_usb {
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struct clk_hw hw;
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struct regmap *regmap;
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u32 divisors[4];
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};
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#define to_at91rm9200_clk_usb(hw) \
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container_of(hw, struct at91rm9200_clk_usb, hw)
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static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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unsigned int usbr;
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u8 usbdiv;
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regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
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usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
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return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
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}
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static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
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struct clk_rate_request *req)
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{
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struct clk_hw *parent;
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long best_rate = -EINVAL;
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unsigned long tmp_rate;
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int best_diff = -1;
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int tmp_diff;
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int i;
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for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
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int div;
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parent = clk_hw_get_parent_by_index(hw, i);
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if (!parent)
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continue;
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for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) {
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unsigned long tmp_parent_rate;
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tmp_parent_rate = req->rate * div;
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tmp_parent_rate = clk_hw_round_rate(parent,
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tmp_parent_rate);
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if (!tmp_parent_rate)
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continue;
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tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div);
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if (tmp_rate < req->rate)
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tmp_diff = req->rate - tmp_rate;
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else
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tmp_diff = tmp_rate - req->rate;
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if (best_diff < 0 || best_diff > tmp_diff) {
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best_rate = tmp_rate;
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best_diff = tmp_diff;
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req->best_parent_rate = tmp_parent_rate;
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req->best_parent_hw = parent;
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}
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if (!best_diff || tmp_rate < req->rate)
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break;
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}
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if (!best_diff)
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break;
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}
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if (best_rate < 0)
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return best_rate;
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req->rate = best_rate;
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return 0;
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}
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static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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if (index >= usb->num_parents)
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return -EINVAL;
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regmap_update_bits(usb->regmap, AT91_PMC_USB, usb->usbs_mask, index);
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return 0;
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}
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static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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unsigned int usbr;
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regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
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return usbr & usb->usbs_mask;
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}
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static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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unsigned long div;
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if (!rate)
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return -EINVAL;
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div = DIV_ROUND_CLOSEST(parent_rate, rate);
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if (div > SAM9X5_USB_MAX_DIV + 1 || !div)
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return -EINVAL;
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regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
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(div - 1) << SAM9X5_USB_DIV_SHIFT);
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return 0;
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}
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static int at91sam9x5_usb_save_context(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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struct clk_hw *parent_hw = clk_hw_get_parent(hw);
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usb->pms.parent = at91sam9x5_clk_usb_get_parent(hw);
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usb->pms.parent_rate = clk_hw_get_rate(parent_hw);
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usb->pms.rate = at91sam9x5_clk_usb_recalc_rate(hw, usb->pms.parent_rate);
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return 0;
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}
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static void at91sam9x5_usb_restore_context(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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int ret;
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ret = at91sam9x5_clk_usb_set_parent(hw, usb->pms.parent);
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if (ret)
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return;
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at91sam9x5_clk_usb_set_rate(hw, usb->pms.rate, usb->pms.parent_rate);
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}
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static const struct clk_ops at91sam9x5_usb_ops = {
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.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
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.determine_rate = at91sam9x5_clk_usb_determine_rate,
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.get_parent = at91sam9x5_clk_usb_get_parent,
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.set_parent = at91sam9x5_clk_usb_set_parent,
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.set_rate = at91sam9x5_clk_usb_set_rate,
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.save_context = at91sam9x5_usb_save_context,
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.restore_context = at91sam9x5_usb_restore_context,
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};
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static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
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AT91_PMC_USBS);
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return 0;
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}
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static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0);
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}
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static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
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{
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struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
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unsigned int usbr;
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regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
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return usbr & AT91_PMC_USBS;
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}
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static const struct clk_ops at91sam9n12_usb_ops = {
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.enable = at91sam9n12_clk_usb_enable,
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.disable = at91sam9n12_clk_usb_disable,
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.is_enabled = at91sam9n12_clk_usb_is_enabled,
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.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
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.determine_rate = at91sam9x5_clk_usb_determine_rate,
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.set_rate = at91sam9x5_clk_usb_set_rate,
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};
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static struct clk_hw * __init
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_at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents,
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u32 usbs_mask)
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{
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struct at91sam9x5_clk_usb *usb;
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struct clk_hw *hw;
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struct clk_init_data init;
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int ret;
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usb = kzalloc(sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &at91sam9x5_usb_ops;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE |
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CLK_SET_RATE_PARENT;
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usb->hw.init = &init;
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usb->regmap = regmap;
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usb->usbs_mask = usbs_mask;
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usb->num_parents = num_parents;
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hw = &usb->hw;
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ret = clk_hw_register(NULL, &usb->hw);
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if (ret) {
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kfree(usb);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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struct clk_hw * __init
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at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents)
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{
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return _at91sam9x5_clk_register_usb(regmap, name, parent_names,
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num_parents, SAM9X5_USBS_MASK);
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}
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struct clk_hw * __init
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sam9x60_clk_register_usb(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents)
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{
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return _at91sam9x5_clk_register_usb(regmap, name, parent_names,
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num_parents, SAM9X60_USBS_MASK);
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}
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struct clk_hw * __init
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at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
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const char *parent_name)
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{
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struct at91sam9x5_clk_usb *usb;
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struct clk_hw *hw;
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struct clk_init_data init;
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int ret;
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usb = kzalloc(sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &at91sam9n12_usb_ops;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT;
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usb->hw.init = &init;
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usb->regmap = regmap;
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hw = &usb->hw;
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ret = clk_hw_register(NULL, &usb->hw);
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if (ret) {
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kfree(usb);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
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unsigned int pllbr;
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u8 usbdiv;
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regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);
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usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
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if (usb->divisors[usbdiv])
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return parent_rate / usb->divisors[usbdiv];
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return 0;
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}
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static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
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struct clk_hw *parent = clk_hw_get_parent(hw);
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unsigned long bestrate = 0;
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int bestdiff = -1;
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unsigned long tmprate;
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int tmpdiff;
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int i = 0;
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for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
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unsigned long tmp_parent_rate;
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if (!usb->divisors[i])
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continue;
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tmp_parent_rate = rate * usb->divisors[i];
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tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate);
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tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
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if (tmprate < rate)
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tmpdiff = rate - tmprate;
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else
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tmpdiff = tmprate - rate;
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if (bestdiff < 0 || bestdiff > tmpdiff) {
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bestrate = tmprate;
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bestdiff = tmpdiff;
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*parent_rate = tmp_parent_rate;
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}
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if (!bestdiff)
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break;
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}
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return bestrate;
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}
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static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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int i;
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struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
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unsigned long div;
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if (!rate)
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return -EINVAL;
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div = DIV_ROUND_CLOSEST(parent_rate, rate);
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for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
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if (usb->divisors[i] == div) {
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regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
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AT91_PMC_USBDIV,
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i << RM9200_USB_DIV_SHIFT);
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return 0;
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}
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}
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return -EINVAL;
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}
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static const struct clk_ops at91rm9200_usb_ops = {
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.recalc_rate = at91rm9200_clk_usb_recalc_rate,
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.round_rate = at91rm9200_clk_usb_round_rate,
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.set_rate = at91rm9200_clk_usb_set_rate,
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};
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struct clk_hw * __init
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at91rm9200_clk_register_usb(struct regmap *regmap, const char *name,
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const char *parent_name, const u32 *divisors)
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{
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struct at91rm9200_clk_usb *usb;
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struct clk_hw *hw;
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struct clk_init_data init;
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int ret;
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usb = kzalloc(sizeof(*usb), GFP_KERNEL);
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if (!usb)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &at91rm9200_usb_ops;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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init.flags = CLK_SET_RATE_PARENT;
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usb->hw.init = &init;
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usb->regmap = regmap;
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memcpy(usb->divisors, divisors, sizeof(usb->divisors));
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hw = &usb->hw;
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ret = clk_hw_register(NULL, &usb->hw);
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if (ret) {
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kfree(usb);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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