summaryrefslogtreecommitdiffstats
path: root/drivers/dma
diff options
context:
space:
mode:
authorMarcin Wojtas <mw@semihalf.com>2016-04-29 09:49:07 +0200
committerVinod Koul <vinod.koul@intel.com>2016-05-03 12:27:47 +0530
commitac5f0f3f863e9e6703a3038aa72814d2d0e8a056 (patch)
treebc9da076d8ea0de1f1a2da61ef329d48e620b150 /drivers/dma
parentdd130c652cb745e82b70cb71a3cf2dd876295e96 (diff)
downloadlinux-ac5f0f3f863e9e6703a3038aa72814d2d0e8a056.tar.bz2
dmaengine: mv_xor: add support for Armada 3700 SoC
Armada 3700 SoC comprise a single XOR engine compliant with the ones used in older Marvell SoC's like Armada XP or 38x. The only thing that needs modification is the Mbus configuration, which has to be done on two levels: global and in device. The first one is inherited from the bootloader. The latter can be opened in a default way, leaving arbitration to the bus controller. Hence filled mbus_dram_target_info structure is not needed. Patch "dmaengine: mv_xor: optimize performance by using a subset of the XOR channels" introduced limitation for using XOR engines and channels vs number of available CPU's. Those constraints do not however fit Armada 3700 architecture with two possible CPU's and single, dual-channel engine. Hence in this commit an adjustment for setting maximum available channels is added. This patch enables XOR access to DRAM by opening default window to 4GB space with specific attribute. Signed-off-by: Marcin Wojtas <mw@semihalf.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/mv_xor.c56
1 files changed, 49 insertions, 7 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 6d012a56b97b..25d1dadcddd1 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -34,6 +34,7 @@
enum mv_xor_type {
XOR_ORION,
XOR_ARMADA_38X,
+ XOR_ARMADA_37XX,
};
enum mv_xor_mode {
@@ -1093,6 +1094,33 @@ mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
}
+static void
+mv_xor_conf_mbus_windows_a3700(struct mv_xor_device *xordev)
+{
+ void __iomem *base = xordev->xor_high_base;
+ u32 win_enable = 0;
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ writel(0, base + WINDOW_BASE(i));
+ writel(0, base + WINDOW_SIZE(i));
+ if (i < 4)
+ writel(0, base + WINDOW_REMAP_HIGH(i));
+ }
+ /*
+ * For Armada3700 open default 4GB Mbus window. The dram
+ * related configuration are done at AXIS level.
+ */
+ writel(0xffff0000, base + WINDOW_SIZE(0));
+ win_enable |= 1;
+ win_enable |= 3 << 16;
+
+ writel(win_enable, base + WINDOW_BAR_ENABLE(0));
+ writel(win_enable, base + WINDOW_BAR_ENABLE(1));
+ writel(0, base + WINDOW_OVERRIDE_CTRL(0));
+ writel(0, base + WINDOW_OVERRIDE_CTRL(1));
+}
+
/*
* Since this XOR driver is basically used only for RAID5, we don't
* need to care about synchronizing ->suspend with DMA activity,
@@ -1137,6 +1165,11 @@ static int mv_xor_resume(struct platform_device *dev)
XOR_INTR_MASK(mv_chan));
}
+ if (xordev->xor_type == XOR_ARMADA_37XX) {
+ mv_xor_conf_mbus_windows_a3700(xordev);
+ return 0;
+ }
+
dram = mv_mbus_dram_info();
if (dram)
mv_xor_conf_mbus_windows(xordev, dram);
@@ -1147,6 +1180,7 @@ static int mv_xor_resume(struct platform_device *dev)
static const struct of_device_id mv_xor_dt_ids[] = {
{ .compatible = "marvell,orion-xor", .data = (void *)XOR_ORION },
{ .compatible = "marvell,armada-380-xor", .data = (void *)XOR_ARMADA_38X },
+ { .compatible = "marvell,armada-3700-xor", .data = (void *)XOR_ARMADA_37XX },
{},
};
@@ -1204,9 +1238,13 @@ static int mv_xor_probe(struct platform_device *pdev)
/*
* (Re-)program MBUS remapping windows if we are asked to.
*/
- dram = mv_mbus_dram_info();
- if (dram)
- mv_xor_conf_mbus_windows(xordev, dram);
+ if (xordev->xor_type == XOR_ARMADA_37XX) {
+ mv_xor_conf_mbus_windows_a3700(xordev);
+ } else {
+ dram = mv_mbus_dram_info();
+ if (dram)
+ mv_xor_conf_mbus_windows(xordev, dram);
+ }
/* Not all platforms can gate the clock, so it is not
* an error if the clock does not exists.
@@ -1220,12 +1258,16 @@ static int mv_xor_probe(struct platform_device *pdev)
* order for async_tx to perform well. So we limit the number
* of engines and channels so that we take into account this
* constraint. Note that we also want to use channels from
- * separate engines when possible.
+ * separate engines when possible. For dual-CPU Armada 3700
+ * SoC with single XOR engine allow using its both channels.
*/
max_engines = num_present_cpus();
- max_channels = min_t(unsigned int,
- MV_XOR_MAX_CHANNELS,
- DIV_ROUND_UP(num_present_cpus(), 2));
+ if (xordev->xor_type == XOR_ARMADA_37XX)
+ max_channels = num_present_cpus();
+ else
+ max_channels = min_t(unsigned int,
+ MV_XOR_MAX_CHANNELS,
+ DIV_ROUND_UP(num_present_cpus(), 2));
if (mv_xor_engine_count >= max_engines)
return 0;