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202 lines
4.1 KiB
202 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. |
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*/ |
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#include <linux/export.h> |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/errno.h> |
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#include <linux/spinlock.h> |
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#include <linux/delay.h> |
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#include <linux/clk.h> |
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#include <video/imx-ipu-v3.h> |
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#include "ipu-prv.h" |
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struct ipu_smfc { |
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struct ipu_smfc_priv *priv; |
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int chno; |
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bool inuse; |
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}; |
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struct ipu_smfc_priv { |
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void __iomem *base; |
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spinlock_t lock; |
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struct ipu_soc *ipu; |
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struct ipu_smfc channel[4]; |
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int use_count; |
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}; |
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/*SMFC Registers */ |
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#define SMFC_MAP 0x0000 |
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#define SMFC_WMC 0x0004 |
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#define SMFC_BS 0x0008 |
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int ipu_smfc_set_burstsize(struct ipu_smfc *smfc, int burstsize) |
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{ |
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struct ipu_smfc_priv *priv = smfc->priv; |
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unsigned long flags; |
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u32 val, shift; |
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spin_lock_irqsave(&priv->lock, flags); |
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shift = smfc->chno * 4; |
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val = readl(priv->base + SMFC_BS); |
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val &= ~(0xf << shift); |
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val |= burstsize << shift; |
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writel(val, priv->base + SMFC_BS); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_set_burstsize); |
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int ipu_smfc_map_channel(struct ipu_smfc *smfc, int csi_id, int mipi_id) |
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{ |
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struct ipu_smfc_priv *priv = smfc->priv; |
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unsigned long flags; |
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u32 val, shift; |
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spin_lock_irqsave(&priv->lock, flags); |
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shift = smfc->chno * 3; |
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val = readl(priv->base + SMFC_MAP); |
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val &= ~(0x7 << shift); |
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val |= ((csi_id << 2) | mipi_id) << shift; |
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writel(val, priv->base + SMFC_MAP); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_map_channel); |
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int ipu_smfc_set_watermark(struct ipu_smfc *smfc, u32 set_level, u32 clr_level) |
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{ |
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struct ipu_smfc_priv *priv = smfc->priv; |
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unsigned long flags; |
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u32 val, shift; |
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spin_lock_irqsave(&priv->lock, flags); |
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shift = smfc->chno * 6 + (smfc->chno > 1 ? 4 : 0); |
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val = readl(priv->base + SMFC_WMC); |
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val &= ~(0x3f << shift); |
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val |= ((clr_level << 3) | set_level) << shift; |
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writel(val, priv->base + SMFC_WMC); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_set_watermark); |
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int ipu_smfc_enable(struct ipu_smfc *smfc) |
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{ |
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struct ipu_smfc_priv *priv = smfc->priv; |
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unsigned long flags; |
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spin_lock_irqsave(&priv->lock, flags); |
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if (!priv->use_count) |
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ipu_module_enable(priv->ipu, IPU_CONF_SMFC_EN); |
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priv->use_count++; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_enable); |
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int ipu_smfc_disable(struct ipu_smfc *smfc) |
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{ |
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struct ipu_smfc_priv *priv = smfc->priv; |
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unsigned long flags; |
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spin_lock_irqsave(&priv->lock, flags); |
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priv->use_count--; |
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if (!priv->use_count) |
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ipu_module_disable(priv->ipu, IPU_CONF_SMFC_EN); |
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if (priv->use_count < 0) |
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priv->use_count = 0; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_disable); |
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struct ipu_smfc *ipu_smfc_get(struct ipu_soc *ipu, unsigned int chno) |
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{ |
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struct ipu_smfc_priv *priv = ipu->smfc_priv; |
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struct ipu_smfc *smfc, *ret; |
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unsigned long flags; |
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if (chno >= 4) |
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return ERR_PTR(-EINVAL); |
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smfc = &priv->channel[chno]; |
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ret = smfc; |
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spin_lock_irqsave(&priv->lock, flags); |
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if (smfc->inuse) { |
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ret = ERR_PTR(-EBUSY); |
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goto unlock; |
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} |
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smfc->inuse = true; |
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unlock: |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_get); |
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void ipu_smfc_put(struct ipu_smfc *smfc) |
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{ |
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struct ipu_smfc_priv *priv = smfc->priv; |
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unsigned long flags; |
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spin_lock_irqsave(&priv->lock, flags); |
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smfc->inuse = false; |
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spin_unlock_irqrestore(&priv->lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(ipu_smfc_put); |
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int ipu_smfc_init(struct ipu_soc *ipu, struct device *dev, |
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unsigned long base) |
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{ |
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struct ipu_smfc_priv *priv; |
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int i; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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ipu->smfc_priv = priv; |
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spin_lock_init(&priv->lock); |
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priv->ipu = ipu; |
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priv->base = devm_ioremap(dev, base, PAGE_SIZE); |
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if (!priv->base) |
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return -ENOMEM; |
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for (i = 0; i < 4; i++) { |
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priv->channel[i].priv = priv; |
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priv->channel[i].chno = i; |
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} |
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pr_debug("%s: ioremap 0x%08lx -> %p\n", __func__, base, priv->base); |
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return 0; |
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} |
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void ipu_smfc_exit(struct ipu_soc *ipu) |
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{ |
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}
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