142 lines
2.9 KiB
C
142 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* OMAP IOMMU quirks for various TI SoCs
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*
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* Copyright (C) 2015-2019 Texas Instruments Incorporated - https://www.ti.com/
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* Suman Anna <s-anna@ti.com>
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*/
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/list.h>
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#include "clockdomain.h"
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#include "powerdomain.h"
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struct pwrdm_link {
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struct device *dev;
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struct powerdomain *pwrdm;
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struct list_head node;
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};
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static DEFINE_SPINLOCK(iommu_lock);
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static struct clockdomain *emu_clkdm;
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static atomic_t emu_count;
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static void omap_iommu_dra7_emu_swsup_config(struct platform_device *pdev,
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bool enable)
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{
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struct device_node *np = pdev->dev.of_node;
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unsigned long flags;
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if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
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return;
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if (!emu_clkdm) {
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emu_clkdm = clkdm_lookup("emu_clkdm");
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if (WARN_ON_ONCE(!emu_clkdm))
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return;
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}
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spin_lock_irqsave(&iommu_lock, flags);
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if (enable && (atomic_inc_return(&emu_count) == 1))
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clkdm_deny_idle(emu_clkdm);
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else if (!enable && (atomic_dec_return(&emu_count) == 0))
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clkdm_allow_idle(emu_clkdm);
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spin_unlock_irqrestore(&iommu_lock, flags);
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}
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static struct powerdomain *_get_pwrdm(struct device *dev)
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{
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struct clk *clk;
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struct clk_hw_omap *hwclk;
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struct clockdomain *clkdm;
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struct powerdomain *pwrdm = NULL;
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struct pwrdm_link *entry;
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unsigned long flags;
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static LIST_HEAD(cache);
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spin_lock_irqsave(&iommu_lock, flags);
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list_for_each_entry(entry, &cache, node) {
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if (entry->dev == dev) {
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pwrdm = entry->pwrdm;
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break;
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}
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}
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spin_unlock_irqrestore(&iommu_lock, flags);
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if (pwrdm)
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return pwrdm;
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clk = of_clk_get(dev->of_node->parent, 0);
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if (IS_ERR(clk)) {
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dev_err(dev, "no fck found\n");
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return NULL;
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}
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hwclk = to_clk_hw_omap(__clk_get_hw(clk));
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clk_put(clk);
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if (!hwclk || !hwclk->clkdm_name) {
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dev_err(dev, "no hwclk data\n");
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return NULL;
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}
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clkdm = clkdm_lookup(hwclk->clkdm_name);
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if (!clkdm) {
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dev_err(dev, "clkdm not found: %s\n", hwclk->clkdm_name);
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return NULL;
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}
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pwrdm = clkdm_get_pwrdm(clkdm);
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if (!pwrdm) {
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dev_err(dev, "pwrdm not found: %s\n", clkdm->name);
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return NULL;
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}
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entry = kmalloc(sizeof(*entry), GFP_KERNEL);
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if (entry) {
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entry->dev = dev;
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entry->pwrdm = pwrdm;
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spin_lock_irqsave(&iommu_lock, flags);
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list_add(&entry->node, &cache);
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spin_unlock_irqrestore(&iommu_lock, flags);
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}
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return pwrdm;
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}
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int omap_iommu_set_pwrdm_constraint(struct platform_device *pdev, bool request,
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u8 *pwrst)
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{
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struct powerdomain *pwrdm;
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u8 next_pwrst;
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int ret = 0;
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pwrdm = _get_pwrdm(&pdev->dev);
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if (!pwrdm)
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return -ENODEV;
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if (request) {
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*pwrst = pwrdm_read_next_pwrst(pwrdm);
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omap_iommu_dra7_emu_swsup_config(pdev, true);
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}
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if (*pwrst > PWRDM_POWER_RET)
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goto out;
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next_pwrst = request ? PWRDM_POWER_ON : *pwrst;
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ret = pwrdm_set_next_pwrst(pwrdm, next_pwrst);
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out:
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if (!request)
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omap_iommu_dra7_emu_swsup_config(pdev, false);
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return ret;
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}
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