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Date: Thu, 11 Sep 2014 11:50:24 +0530
From: Vinod Koul <vinod.koul@...el.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>
Cc: Hans-Christian Egtvedt <egtvedt@...fundet.no>,
Haavard Skinnemoen <hskinnemoen@...il.com>,
Mark Brown <broonie@...nel.org>,
Hein Tibosch <hein_tibosch@...oo.es>,
Russell King <linux@....linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Takashi Iwai <tiwai@...e.de>,
Kweh Hock Leong <hock.leong.kweh@...el.com>,
Mika Westerberg <mika.westerberg@...ux.jf.intel.com>,
Alan Cox <alan@...ux.jf.intel.com>, dmaengine@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 08/12] spi/pxa2xx: Don't use slave_id of
dma_slave_config
On Tue, Aug 19, 2014 at 08:29:19PM +0300, Andy Shevchenko wrote:
> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
>
> That field has been deprecated in favour of getting the necessary
> information from ACPI/DT.
>
> However, we still need to deal systems that are PCI only (no ACPI to back
> up). In order to support such systems, we allow the DMA filter function and
> its corresponding parameter via pxa2xx_spi_master platform data. Then when
> the pxa2xx_spi_dma_setup() doesn't find the channel via ACPI, it falls back
> to use the given filter function.
This fails to apply for me, was it based on dmaengine tree or spi?
--
~Vinod
>
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> drivers/spi/spi-pxa2xx-dma.c | 15 ++--------
> drivers/spi/spi-pxa2xx-pci.c | 64 +++++++++++++++++++++++++++++++-----------
> drivers/spi/spi-pxa2xx.c | 2 --
> include/linux/spi/pxa2xx_spi.h | 9 +++---
> 4 files changed, 54 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
> index c41ff14..62a9297 100644
> --- a/drivers/spi/spi-pxa2xx-dma.c
> +++ b/drivers/spi/spi-pxa2xx-dma.c
> @@ -157,7 +157,6 @@ static struct dma_async_tx_descriptor *
> pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
> enum dma_transfer_direction dir)
> {
> - struct pxa2xx_spi_master *pdata = drv_data->master_info;
> struct chip_data *chip = drv_data->cur_chip;
> enum dma_slave_buswidth width;
> struct dma_slave_config cfg;
> @@ -184,7 +183,6 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
> cfg.dst_addr = drv_data->ssdr_physical;
> cfg.dst_addr_width = width;
> cfg.dst_maxburst = chip->dma_burst_size;
> - cfg.slave_id = pdata->tx_slave_id;
>
> sgt = &drv_data->tx_sgt;
> nents = drv_data->tx_nents;
> @@ -193,7 +191,6 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
> cfg.src_addr = drv_data->ssdr_physical;
> cfg.src_addr_width = width;
> cfg.src_maxburst = chip->dma_burst_size;
> - cfg.slave_id = pdata->rx_slave_id;
>
> sgt = &drv_data->rx_sgt;
> nents = drv_data->rx_nents;
> @@ -210,14 +207,6 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
> DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
> }
>
> -static bool pxa2xx_spi_dma_filter(struct dma_chan *chan, void *param)
> -{
> - const struct pxa2xx_spi_master *pdata = param;
> -
> - return chan->chan_id == pdata->tx_chan_id ||
> - chan->chan_id == pdata->rx_chan_id;
> -}
> -
> bool pxa2xx_spi_dma_is_possible(size_t len)
> {
> return len <= MAX_DMA_LEN;
> @@ -321,12 +310,12 @@ int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
> return -ENOMEM;
>
> drv_data->tx_chan = dma_request_slave_channel_compat(mask,
> - pxa2xx_spi_dma_filter, pdata, dev, "tx");
> + pdata->dma_filter, pdata->tx_param, dev, "tx");
> if (!drv_data->tx_chan)
> return -ENODEV;
>
> drv_data->rx_chan = dma_request_slave_channel_compat(mask,
> - pxa2xx_spi_dma_filter, pdata, dev, "rx");
> + pdata->dma_filter, pdata->rx_param, dev, "rx");
> if (!drv_data->rx_chan) {
> dma_release_channel(drv_data->tx_chan);
> drv_data->tx_chan = NULL;
> diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
> index 20ebbc7..0424b67 100644
> --- a/drivers/spi/spi-pxa2xx-pci.c
> +++ b/drivers/spi/spi-pxa2xx-pci.c
> @@ -10,6 +10,9 @@
> #include <linux/clk.h>
> #include <linux/clk-provider.h>
>
> +#include <linux/dmaengine.h>
> +#include <linux/platform_data/dma-dw.h>
> +
> enum {
> PORT_CE4100,
> PORT_BYT,
> @@ -19,33 +22,41 @@ struct pxa_spi_info {
> enum pxa_ssp_type type;
> int port_id;
> int num_chipselect;
> - int tx_slave_id;
> - int tx_chan_id;
> - int rx_slave_id;
> - int rx_chan_id;
> unsigned long max_clk_rate;
> +
> + /* DMA channel request parameters */
> + void *tx_param;
> + void *rx_param;
> };
>
> +static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
> +static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
> +
> +static bool lpss_dma_filter(struct dma_chan *chan, void *param)
> +{
> + struct dw_dma_slave *dws = param;
> +
> + if (dws->dma_dev != chan->device->dev)
> + return false;
> +
> + chan->private = dws;
> + return true;
> +}
> +
> static struct pxa_spi_info spi_info_configs[] = {
> [PORT_CE4100] = {
> .type = PXA25x_SSP,
> .port_id = -1,
> .num_chipselect = -1,
> - .tx_slave_id = -1,
> - .tx_chan_id = -1,
> - .rx_slave_id = -1,
> - .rx_chan_id = -1,
> .max_clk_rate = 3686400,
> },
> [PORT_BYT] = {
> .type = LPSS_SSP,
> .port_id = 0,
> .num_chipselect = 1,
> - .tx_slave_id = 0,
> - .tx_chan_id = 0,
> - .rx_slave_id = 1,
> - .rx_chan_id = 1,
> .max_clk_rate = 50000000,
> + .tx_param = &byt_tx_param,
> + .rx_param = &byt_rx_param,
> },
> };
>
> @@ -59,6 +70,7 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
> struct ssp_device *ssp;
> struct pxa_spi_info *c;
> char buf[40];
> + struct pci_dev *dma_dev;
>
> ret = pcim_enable_device(dev);
> if (ret)
> @@ -73,11 +85,29 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
> memset(&spi_pdata, 0, sizeof(spi_pdata));
> spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
> c->num_chipselect : dev->devfn;
> - spi_pdata.tx_slave_id = c->tx_slave_id;
> - spi_pdata.tx_chan_id = c->tx_chan_id;
> - spi_pdata.rx_slave_id = c->rx_slave_id;
> - spi_pdata.rx_chan_id = c->rx_chan_id;
> - spi_pdata.enable_dma = c->rx_slave_id >= 0 && c->tx_slave_id >= 0;
> +
> + dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
> +
> + if (c->tx_param) {
> + struct dw_dma_slave *slave = c->tx_param;
> +
> + slave->dma_dev = &dma_dev->dev;
> + slave->src_master = 1;
> + slave->dst_master = 0;
> + }
> +
> + if (c->rx_param) {
> + struct dw_dma_slave *slave = c->rx_param;
> +
> + slave->dma_dev = &dma_dev->dev;
> + slave->src_master = 1;
> + slave->dst_master = 0;
> + }
> +
> + spi_pdata.dma_filter = lpss_dma_filter;
> + spi_pdata.tx_param = c->tx_param;
> + spi_pdata.rx_param = c->rx_param;
> + spi_pdata.enable_dma = c->rx_param && c->tx_param;
>
> ssp = &spi_pdata.ssp;
> ssp->phys_base = pci_resource_start(dev, 0);
> diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
> index fe79210..256c0ab 100644
> --- a/drivers/spi/spi-pxa2xx.c
> +++ b/drivers/spi/spi-pxa2xx.c
> @@ -1062,8 +1062,6 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
>
> pdata->num_chipselect = 1;
> pdata->enable_dma = true;
> - pdata->tx_chan_id = -1;
> - pdata->rx_chan_id = -1;
>
> return pdata;
> }
> diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h
> index 82d5111..d5a3165 100644
> --- a/include/linux/spi/pxa2xx_spi.h
> +++ b/include/linux/spi/pxa2xx_spi.h
> @@ -23,6 +23,8 @@
> #define PXA2XX_CS_ASSERT (0x01)
> #define PXA2XX_CS_DEASSERT (0x02)
>
> +struct dma_chan;
> +
> /* device.platform_data for SSP controller devices */
> struct pxa2xx_spi_master {
> u32 clock_enable;
> @@ -30,10 +32,9 @@ struct pxa2xx_spi_master {
> u8 enable_dma;
>
> /* DMA engine specific config */
> - int rx_chan_id;
> - int tx_chan_id;
> - int rx_slave_id;
> - int tx_slave_id;
> + bool (*dma_filter)(struct dma_chan *chan, void *param);
> + void *tx_param;
> + void *rx_param;
>
> /* For non-PXA arches */
> struct ssp_device ssp;
> --
> 2.1.0
>
--
--
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