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Date: Tue, 22 Nov 2011 13:56:55 +0530
From: Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
To: <linux-kernel@...r.kernel.org>, Vinod Koul <vinod.koul@...el.com>
Cc: <rabin.vincent@...ricsson.com>, <linus.walleij@...ricsson.com>,
Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
Subject: [PATCH] dmaengine/ste_dma40: Add support to use lcla area from esram
This patch provides an option of having the lcla (link address)
in ESRAM instead of allocating it. The bool value (use_esram_lcla)
in the stedma40_platform_data if set to true, then the lcla
address would be taken from platform resources. Also, the
corresponding esram regulator is managed in the
suspend/resume functions.
Signed-off-by: Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
---
arch/arm/plat-nomadik/include/plat/ste_dma40.h | 1 +
drivers/dma/ste_dma40.c | 95 +++++++++++++++++++++---
2 files changed, 86 insertions(+), 10 deletions(-)
This just adds the support to move lcla into esram. The enabling of this
will be done from the platform_data in another patch.
diff --git a/arch/arm/plat-nomadik/include/plat/ste_dma40.h b/arch/arm/plat-nomadik/include/plat/ste_dma40.h
index 685c787..d7edcbe 100644
--- a/arch/arm/plat-nomadik/include/plat/ste_dma40.h
+++ b/arch/arm/plat-nomadik/include/plat/ste_dma40.h
@@ -153,6 +153,7 @@ struct stedma40_platform_data {
struct stedma40_chan_cfg *memcpy_conf_phy;
struct stedma40_chan_cfg *memcpy_conf_log;
int disabled_channels[STEDMA40_MAX_PHYS];
+ bool use_esram_lcla;
};
#ifdef CONFIG_STE_DMA40
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 909cf0d..865af22 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -304,6 +304,7 @@ struct d40_chan {
* to phy_chans entries.
* @plat_data: Pointer to provided platform_data which is the driver
* configuration.
+ * @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla.
* @phy_res: Vector containing all physical channels.
* @lcla_pool: lcla pool settings and data.
* @lcpa_base: The virtual mapped address of LCPA.
@@ -338,6 +339,7 @@ struct d40_base {
struct d40_chan **lookup_log_chans;
struct d40_chan **lookup_phy_chans;
struct stedma40_platform_data *plat_data;
+ struct regulator *lcpa_regulator;
/* Physical half channels */
struct d40_phy_res *phy_res;
struct d40_lcla_pool lcla_pool;
@@ -605,6 +607,7 @@ static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
bool cyclic = desc->cyclic;
int curr_lcla = -EINVAL;
int first_lcla = 0;
+ bool use_esram_lcla = chan->base->plat_data->use_esram_lcla;
bool linkback;
/*
@@ -677,11 +680,16 @@ static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
&lli->src[lli_current],
next_lcla, flags);
- dma_sync_single_range_for_device(chan->base->dev,
- pool->dma_addr, lcla_offset,
- 2 * sizeof(struct d40_log_lli),
- DMA_TO_DEVICE);
-
+ /*
+ * Cache maintenance is not needed if lcla is
+ * mapped in esram
+ */
+ if (!use_esram_lcla) {
+ dma_sync_single_range_for_device(chan->base->dev,
+ pool->dma_addr, lcla_offset,
+ 2 * sizeof(struct d40_log_lli),
+ DMA_TO_DEVICE);
+ }
curr_lcla = next_lcla;
if (curr_lcla == -EINVAL || curr_lcla == first_lcla) {
@@ -2668,10 +2676,15 @@ failure1:
#ifdef CONFIG_PM
static int dma40_pm_suspend(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct d40_base *base = platform_get_drvdata(pdev);
+ int ret = 0;
if (!pm_runtime_suspended(dev))
return -EBUSY;
- return 0;
+ if (base->lcpa_regulator)
+ ret = regulator_disable(base->lcpa_regulator);
+ return ret;
}
static int dma40_runtime_suspend(struct device *dev)
@@ -2702,11 +2715,23 @@ static int dma40_runtime_resume(struct device *dev)
return 0;
}
+static int dma40_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct d40_base *base = platform_get_drvdata(pdev);
+ int ret = 0;
+
+ if (base->lcpa_regulator)
+ ret = regulator_enable(base->lcpa_regulator);
+
+ return ret;
+}
static const struct dev_pm_ops dma40_pm_ops = {
.suspend = dma40_pm_suspend,
.runtime_suspend = dma40_runtime_suspend,
.runtime_resume = dma40_runtime_resume,
+ .resume = dma40_resume,
};
#define DMA40_PM_OPS (&dma40_pm_ops)
#else
@@ -3165,11 +3190,31 @@ static int __init d40_probe(struct platform_device *pdev)
d40_err(&pdev->dev, "Failed to ioremap LCPA region\n");
goto failure;
}
+ /* If lcla has to be located in ESRAM we don't need to allocate */
+ if (base->plat_data->use_esram_lcla) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "lcla_esram");
+ if (!res) {
+ ret = -ENOENT;
+ d40_err(&pdev->dev,
+ "No \"lcla_esram\" memory resource\n");
+ goto failure;
+ }
+ base->lcla_pool.base = ioremap(res->start,
+ resource_size(res));
+ if (!base->lcla_pool.base) {
+ ret = -ENOMEM;
+ d40_err(&pdev->dev, "Failed to ioremap LCLA region\n");
+ goto failure;
+ }
+ writel(res->start, base->virtbase + D40_DREG_LCLA);
- ret = d40_lcla_allocate(base);
- if (ret) {
- d40_err(&pdev->dev, "Failed to allocate LCLA area\n");
- goto failure;
+ } else {
+ ret = d40_lcla_allocate(base);
+ if (ret) {
+ d40_err(&pdev->dev, "Failed to allocate LCLA area\n");
+ goto failure;
+ }
}
spin_lock_init(&base->lcla_pool.lock);
@@ -3187,6 +3232,26 @@ static int __init d40_probe(struct platform_device *pdev)
pm_runtime_use_autosuspend(base->dev);
pm_runtime_enable(base->dev);
pm_runtime_resume(base->dev);
+
+ if (base->plat_data->use_esram_lcla) {
+
+ base->lcpa_regulator = regulator_get(base->dev, "lcla_esram");
+ if (IS_ERR(base->lcpa_regulator)) {
+ d40_err(&pdev->dev, "Failed to get lcpa_regulator\n");
+ base->lcpa_regulator = NULL;
+ goto failure;
+ }
+
+ ret = regulator_enable(base->lcpa_regulator);
+ if (ret) {
+ d40_err(&pdev->dev,
+ "Failed to enable lcpa_regulator\n");
+ regulator_put(base->lcpa_regulator);
+ base->lcpa_regulator = NULL;
+ goto failure;
+ }
+ }
+
base->initialized = true;
err = d40_dmaengine_init(base, num_reserved_chans);
if (err)
@@ -3204,6 +3269,11 @@ failure:
if (base->virtbase)
iounmap(base->virtbase);
+ if (base->lcla_pool.base && base->plat_data->use_esram_lcla) {
+ iounmap(base->lcla_pool.base);
+ base->lcla_pool.base = NULL;
+ }
+
if (base->lcla_pool.dma_addr)
dma_unmap_single(base->dev, base->lcla_pool.dma_addr,
SZ_1K * base->num_phy_chans,
@@ -3226,6 +3296,11 @@ failure:
clk_put(base->clk);
}
+ if (base->lcpa_regulator) {
+ regulator_disable(base->lcpa_regulator);
+ regulator_put(base->lcpa_regulator);
+ }
+
kfree(base->lcla_pool.alloc_map);
kfree(base->lookup_log_chans);
kfree(base->lookup_phy_chans);
--
1.7.4.3
--
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