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36971566ea
SAMA5D2 and SAMA7G5 have a special power saving mode (backup mode) where most of the SoC's components are powered off (including PMC). Resuming from this mode is done with the help of bootloader. Peripherals are not aware of the power saving mode thus most of them are disabling clocks in proper suspend API and re-enable them in resume API without taking into account the previously setup rate. Moreover some of the peripherals are acting as wakeup sources and are not disabling the clocks in this scenario, when suspending. Since backup mode cuts the power for peripherals, in resume part these clocks needs to be re-configured. The initial PMC suspend/resume code was designed only for SAMA5D2's PMC (as it was the only one supporting backup mode). SAMA7G supports also backup mode and its PMC is different (few new functionalities, different registers offsets, different offsets in registers for each functionalities). To address both SAMA5D2 and SAMA7G5 PMC add .save_context()/.resume_context() support to each clocks driver and call this from PMC driver. Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20211011112719.3951784-2-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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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