[PATCH 08/26] gpu: ipu-v3: smfc: Convert to per-channel
Philipp Zabel
p.zabel at pengutronix.de
Mon Aug 18 06:40:07 PDT 2014
From: Steve Longerbeam <slongerbeam at gmail.com>
Convert the smfc object to be specific to a single smfc channel.
Add ipu_smfc_{get|put} to retrieve and release a single smfc channel
for exclusive use, and add use counter to ipu_smfc_{enable|disable}.
Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
drivers/gpu/ipu-v3/ipu-smfc.c | 132 +++++++++++++++++++++++++++++++++---------
include/video/imx-ipu-v3.h | 10 ++--
2 files changed, 112 insertions(+), 30 deletions(-)
diff --git a/drivers/gpu/ipu-v3/ipu-smfc.c b/drivers/gpu/ipu-v3/ipu-smfc.c
index 87ac624d..a6429ca 100644
--- a/drivers/gpu/ipu-v3/ipu-smfc.c
+++ b/drivers/gpu/ipu-v3/ipu-smfc.c
@@ -21,9 +21,18 @@
#include "ipu-prv.h"
+struct ipu_smfc {
+ struct ipu_smfc_priv *priv;
+ int chno;
+ bool inuse;
+};
+
struct ipu_smfc_priv {
void __iomem *base;
spinlock_t lock;
+ struct ipu_soc *ipu;
+ struct ipu_smfc channel[4];
+ int use_count;
};
/*SMFC Registers */
@@ -31,75 +40,146 @@ struct ipu_smfc_priv {
#define SMFC_WMC 0x0004
#define SMFC_BS 0x0008
-int ipu_smfc_set_burstsize(struct ipu_soc *ipu, int channel, int burstsize)
+int ipu_smfc_set_burstsize(struct ipu_smfc *smfc, int burstsize)
{
- struct ipu_smfc_priv *smfc = ipu->smfc_priv;
+ struct ipu_smfc_priv *priv = smfc->priv;
unsigned long flags;
u32 val, shift;
- spin_lock_irqsave(&smfc->lock, flags);
+ spin_lock_irqsave(&priv->lock, flags);
- shift = channel * 4;
- val = readl(smfc->base + SMFC_BS);
+ shift = smfc->chno * 4;
+ val = readl(priv->base + SMFC_BS);
val &= ~(0xf << shift);
val |= burstsize << shift;
- writel(val, smfc->base + SMFC_BS);
+ writel(val, priv->base + SMFC_BS);
- spin_unlock_irqrestore(&smfc->lock, flags);
+ spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ipu_smfc_set_burstsize);
-int ipu_smfc_map_channel(struct ipu_soc *ipu, int channel, int csi_id, int mipi_id)
+int ipu_smfc_map_channel(struct ipu_smfc *smfc, int csi_id, int mipi_id)
{
- struct ipu_smfc_priv *smfc = ipu->smfc_priv;
+ struct ipu_smfc_priv *priv = smfc->priv;
unsigned long flags;
u32 val, shift;
- spin_lock_irqsave(&smfc->lock, flags);
+ spin_lock_irqsave(&priv->lock, flags);
- shift = channel * 3;
- val = readl(smfc->base + SMFC_MAP);
+ shift = smfc->chno * 3;
+ val = readl(priv->base + SMFC_MAP);
val &= ~(0x7 << shift);
val |= ((csi_id << 2) | mipi_id) << shift;
- writel(val, smfc->base + SMFC_MAP);
+ writel(val, priv->base + SMFC_MAP);
- spin_unlock_irqrestore(&smfc->lock, flags);
+ spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ipu_smfc_map_channel);
-int ipu_smfc_enable(struct ipu_soc *ipu)
+int ipu_smfc_enable(struct ipu_smfc *smfc)
{
- return ipu_module_enable(ipu, IPU_CONF_SMFC_EN);
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ if (!priv->use_count)
+ ipu_module_enable(priv->ipu, IPU_CONF_SMFC_EN);
+
+ priv->use_count++;
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(ipu_smfc_enable);
-int ipu_smfc_disable(struct ipu_soc *ipu)
+int ipu_smfc_disable(struct ipu_smfc *smfc)
{
- return ipu_module_disable(ipu, IPU_CONF_SMFC_EN);
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ priv->use_count--;
+
+ if (!priv->use_count)
+ ipu_module_disable(priv->ipu, IPU_CONF_SMFC_EN);
+
+ if (priv->use_count < 0)
+ priv->use_count = 0;
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(ipu_smfc_disable);
+struct ipu_smfc *ipu_smfc_get(struct ipu_soc *ipu, unsigned int chno)
+{
+ struct ipu_smfc_priv *priv = ipu->smfc_priv;
+ struct ipu_smfc *smfc, *ret;
+ unsigned long flags;
+
+ if (chno >= 4)
+ return ERR_PTR(-EINVAL);
+
+ smfc = &priv->channel[chno];
+ ret = smfc;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ if (smfc->inuse) {
+ ret = ERR_PTR(-EBUSY);
+ goto unlock;
+ }
+
+ smfc->inuse = true;
+unlock:
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_get);
+
+void ipu_smfc_put(struct ipu_smfc *smfc)
+{
+ struct ipu_smfc_priv *priv = smfc->priv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ smfc->inuse = false;
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+EXPORT_SYMBOL_GPL(ipu_smfc_put);
+
int ipu_smfc_init(struct ipu_soc *ipu, struct device *dev,
unsigned long base)
{
- struct ipu_smfc_priv *smfc;
+ struct ipu_smfc_priv *priv;
+ int i;
- smfc = devm_kzalloc(dev, sizeof(*smfc), GFP_KERNEL);
- if (!smfc)
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
return -ENOMEM;
- ipu->smfc_priv = smfc;
- spin_lock_init(&smfc->lock);
+ ipu->smfc_priv = priv;
+ spin_lock_init(&priv->lock);
+ priv->ipu = ipu;
- smfc->base = devm_ioremap(dev, base, PAGE_SIZE);
- if (!smfc->base)
+ priv->base = devm_ioremap(dev, base, PAGE_SIZE);
+ if (!priv->base)
return -ENOMEM;
- pr_debug("%s: ioremap 0x%08lx -> %p\n", __func__, base, smfc->base);
+ for (i = 0; i < 4; i++) {
+ priv->channel[i].priv = priv;
+ priv->channel[i].chno = i;
+ }
+
+ pr_debug("%s: ioremap 0x%08lx -> %p\n", __func__, base, priv->base);
return 0;
}
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index a2798ed..914e868 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -326,10 +326,12 @@ void ipu_ic_dump(struct ipu_ic *ic);
/*
* IPU Sensor Multiple FIFO Controller (SMFC) functions
*/
-int ipu_smfc_enable(struct ipu_soc *ipu);
-int ipu_smfc_disable(struct ipu_soc *ipu);
-int ipu_smfc_map_channel(struct ipu_soc *ipu, int channel, int csi_id, int mipi_id);
-int ipu_smfc_set_burstsize(struct ipu_soc *ipu, int channel, int burstsize);
+struct ipu_smfc *ipu_smfc_get(struct ipu_soc *ipu, unsigned int chno);
+void ipu_smfc_put(struct ipu_smfc *smfc);
+int ipu_smfc_enable(struct ipu_smfc *smfc);
+int ipu_smfc_disable(struct ipu_smfc *smfc);
+int ipu_smfc_map_channel(struct ipu_smfc *smfc, int csi_id, int mipi_id);
+int ipu_smfc_set_burstsize(struct ipu_smfc *smfc, int burstsize);
enum ipu_color_space ipu_drm_fourcc_to_colorspace(u32 drm_fourcc);
enum ipu_color_space ipu_pixelformat_to_colorspace(u32 pixelformat);
--
2.1.0.rc1
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