Merge tag 'tegra-for-3.14-dmas-resets-rework' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/cleanup

From Stephen Warren:
ARM: tegra: implement common DMA and resets DT bindings

This series converts the Tegra DTs and drivers to use the common/
standard DMA and reset bindings, rather than custom bindings. It also
adds complete documentation for the Tegra clock bindings without
actually changing any binding definitions.

This conversion relies on a few sets of patches in branches from outside
the Tegra tree:

1) A patch to add an DMA channel request API which allows deferred probe
   to be implemented.

2) A patch to implement a common part of the of_xlate function for DMA
   controllers.

3) Some ASoC patches (which in turn rely on (1) above), which support
   deferred probe during DMA channel allocation.

4) The Tegra clock driver changes for 3.14.

Consequently, this branch is based on a merge of all of those external
branches.

In turn, this branch is or will be pulled into a few places that either
rely on features introduced here, or would otherwise conflict with the
patches:

a) Tegra's own for-3.14/powergate and for-4.14/dt branches, to avoid
   conflicts.

b) The DRM tree, which introduces new code that relies on the reset
   controller framework introduced in this branch, and to avoid
   conflicts.

* tag 'tegra-for-3.14-dmas-resets-rework' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux: (30 commits)
  spi: tegra: checking for ERR_PTR instead of NULL
  ASoC: tegra: update module reset list for Tegra124
  clk: tegra: remove bogus PCIE_XCLK
  clk: tegra: remove legacy reset APIs
  ARM: tegra: remove legacy DMA entries from DT
  ARM: tegra: remove legacy clock entries from DT
  USB: EHCI: tegra: use reset framework
  Input: tegra-kbc - use reset framework
  serial: tegra: convert to standard DMA DT bindings
  serial: tegra: use reset framework
  spi: tegra: convert to standard DMA DT bindings
  spi: tegra: use reset framework
  staging: nvec: use reset framework
  i2c: tegra: use reset framework
  ASoC: tegra: convert to standard DMA DT bindings
  ASoC: tegra: allocate AHUB FIFO during probe() not startup()
  ASoC: tegra: call pm_runtime APIs around register accesses
  ASoC: tegra: use reset framework
  dma: tegra: register as an OF DMA controller
  dma: tegra: use reset framework
  ...

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 46 insertions, 6 deletions

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 73654e33f13b..d11bb3620f27 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1,7 +1,7 @@
 /*
  * DMA driver for Nvidia's Tegra20 APB DMA controller.
  *
- * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2012-2013, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -29,11 +29,12 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_dma.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
-#include <linux/clk/tegra.h>
 
 #include "dmaengine.h"
 
@@ -199,6 +200,7 @@ struct tegra_dma_channel {
         void                    *callback_param;
 
         /* Channel-slave specific configuration */
+        unsigned int slave_id;
         struct dma_slave_config dma_sconfig;
         struct tegra_dma_channel_regs   channel_reg;
 };
@@ -208,6 +210,7 @@ struct tegra_dma {
         struct dma_device               dma_dev;
         struct device                   *dev;
         struct clk                      *dma_clk;
+        struct reset_control            *rst;
         spinlock_t                      global_lock;
         void __iomem                    *base_addr;
         const struct tegra_dma_chip_data *chip_data;
@@ -339,6 +342,8 @@ static int tegra_dma_slave_config(struct dma_chan *dc,
         }
 
         memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
+        if (!tdc->slave_id)
+                tdc->slave_id = sconfig->slave_id;
         tdc->config_init = true;
         return 0;
 }
@@ -941,7 +946,7 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
         ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
 
         csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW;
-        csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
+        csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
         if (flags & DMA_PREP_INTERRUPT)
                 csr |= TEGRA_APBDMA_CSR_IE_EOC;
 
@@ -1085,7 +1090,7 @@ static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
         csr |= TEGRA_APBDMA_CSR_FLOW;
         if (flags & DMA_PREP_INTERRUPT)
                 csr |= TEGRA_APBDMA_CSR_IE_EOC;
-        csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
+        csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
 
         apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
 
@@ -1205,6 +1210,25 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
                 kfree(sg_req);
         }
         clk_disable_unprepare(tdma->dma_clk);
+
+        tdc->slave_id = 0;
+}
+
+static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
+                                           struct of_dma *ofdma)
+{
+        struct tegra_dma *tdma = ofdma->of_dma_data;
+        struct dma_chan *chan;
+        struct tegra_dma_channel *tdc;
+
+        chan = dma_get_any_slave_channel(&tdma->dma_dev);
+        if (!chan)
+                return NULL;
+
+        tdc = to_tegra_dma_chan(chan);
+        tdc->slave_id = dma_spec->args[0];
+
+        return chan;
 }
 
 /* Tegra20 specific DMA controller information */
@@ -1282,6 +1306,12 @@ static int tegra_dma_probe(struct platform_device *pdev)
                 return PTR_ERR(tdma->dma_clk);
         }
 
+        tdma->rst = devm_reset_control_get(&pdev->dev, "dma");
+        if (IS_ERR(tdma->rst)) {
+                dev_err(&pdev->dev, "Error: Missing reset\n");
+                return PTR_ERR(tdma->rst);
+        }
+
         spin_lock_init(&tdma->global_lock);
 
         pm_runtime_enable(&pdev->dev);
@@ -1302,9 +1332,9 @@ static int tegra_dma_probe(struct platform_device *pdev)
         }
 
         /* Reset DMA controller */
-        tegra_periph_reset_assert(tdma->dma_clk);
+        reset_control_assert(tdma->rst);
         udelay(2);
-        tegra_periph_reset_deassert(tdma->dma_clk);
+        reset_control_deassert(tdma->rst);
 
         /* Enable global DMA registers */
         tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
@@ -1376,10 +1406,20 @@ static int tegra_dma_probe(struct platform_device *pdev)
                 goto err_irq;
         }
 
+        ret = of_dma_controller_register(pdev->dev.of_node,
+                                         tegra_dma_of_xlate, tdma);
+        if (ret < 0) {
+                dev_err(&pdev->dev,
+                        "Tegra20 APB DMA OF registration failed %d\n", ret);
+                goto err_unregister_dma_dev;
+        }
+
         dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n",
                         cdata->nr_channels);
         return 0;
 
+err_unregister_dma_dev:
+        dma_async_device_unregister(&tdma->dma_dev);
 err_irq:
         while (--i >= 0) {
                 struct tegra_dma_channel *tdc = &tdma->channels[i];