From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753810AbaHSR3j (ORCPT ); Tue, 19 Aug 2014 13:29:39 -0400 Received: from mga11.intel.com ([192.55.52.93]:28258 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753736AbaHSR3g (ORCPT ); Tue, 19 Aug 2014 13:29:36 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,896,1400050800"; d="scan'208";a="587012990" From: Andy Shevchenko To: Hans-Christian Egtvedt , Haavard Skinnemoen , Vinod Koul , Mark Brown , Hein Tibosch , Russell King , Greg Kroah-Hartman , Takashi Iwai , Kweh Hock Leong , Mika Westerberg , Alan Cox , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Andy Shevchenko Subject: [PATCH v1 04/12] dmaengine: dw: apply both HS interfaces and remove slave_id usage Date: Tue, 19 Aug 2014 20:29:15 +0300 Message-Id: <1408469363-15901-5-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1408469363-15901-1-git-send-email-andriy.shevchenko@linux.intel.com> References: <1408469363-15901-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Instead of one request line member let's use both source and destination ones. Usually we have no such hardware except Atmel MMC controller found on AVR32 platform (see arch/avr32/mach-at32ap/at32ap700x.c and drivers/mmc/host/atmel-mci.c). This patch removes slave_id usage since it'll be removed from the generic structure in later. This breaks the non-ACPI / non-DT cases for the users of the driver, i.e. SPI and HSUART. However, these cases mean only PCI enumerated devices for now, which is anyway broken (considering more than one DMA controller in the system) and this patch series is intended to fix that eventually. The ACPI and DT cases shall be aware of the channel direction when setting request lines, but this is a minor problem that would be addressed in future. Suggested-by: Arnd Bergmann Signed-off-by: Andy Shevchenko --- drivers/dma/dw/core.c | 32 ++------------------------------ drivers/dma/dw/platform.c | 6 ++++-- drivers/dma/dw/regs.h | 7 ++++--- 3 files changed, 10 insertions(+), 35 deletions(-) diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index 0a9c052..1c45212 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -37,24 +37,6 @@ * support descriptor writeback. */ -static inline bool is_request_line_unset(struct dw_dma_chan *dwc) -{ - return dwc->request_line == (typeof(dwc->request_line))~0; -} - -static inline void dwc_set_masters(struct dw_dma_chan *dwc) -{ - struct dw_dma *dw = to_dw_dma(dwc->chan.device); - struct dw_dma_slave *dws = dwc->chan.private; - unsigned char mmax = dw->nr_masters - 1; - - if (!is_request_line_unset(dwc)) - return; - - dwc->src_master = min_t(unsigned char, mmax, dwc_get_sms(dws)); - dwc->dst_master = min_t(unsigned char, mmax, dwc_get_dms(dws)); -} - #define DWC_DEFAULT_CTLLO(_chan) ({ \ struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \ struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \ @@ -158,10 +140,8 @@ static void dwc_initialize(struct dw_dma_chan *dwc) cfghi |= DWC_CFGH_DST_PER(dws->dst_id); cfghi |= DWC_CFGH_SRC_PER(dws->src_id); } else { - if (dwc->direction == DMA_MEM_TO_DEV) - cfghi = DWC_CFGH_DST_PER(dwc->request_line); - else if (dwc->direction == DMA_DEV_TO_MEM) - cfghi = DWC_CFGH_SRC_PER(dwc->request_line); + cfghi |= DWC_CFGH_DST_PER(dwc->dst_id); + cfghi |= DWC_CFGH_SRC_PER(dwc->src_id); } channel_writel(dwc, CFG_LO, cfglo); @@ -967,10 +947,6 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig) memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig)); dwc->direction = sconfig->direction; - /* Take the request line from slave_id member */ - if (is_request_line_unset(dwc)) - dwc->request_line = sconfig->slave_id; - convert_burst(&dwc->dma_sconfig.src_maxburst); convert_burst(&dwc->dma_sconfig.dst_maxburst); @@ -1123,8 +1099,6 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan) * doesn't mean what you think it means), and status writeback. */ - dwc_set_masters(dwc); - spin_lock_irqsave(&dwc->lock, flags); i = dwc->descs_allocated; while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) { @@ -1182,7 +1156,6 @@ static void dwc_free_chan_resources(struct dma_chan *chan) list_splice_init(&dwc->free_list, &list); dwc->descs_allocated = 0; dwc->initialized = false; - dwc->request_line = ~0; /* Disable interrupts */ channel_clear_bit(dw, MASK.XFER, dwc->mask); @@ -1604,7 +1577,6 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) channel_clear_bit(dw, CH_EN, dwc->mask); dwc->direction = DMA_TRANS_NONE; - dwc->request_line = ~0; /* Hardware configuration */ if (autocfg) { diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c index c5b339a..7aa3cd3 100644 --- a/drivers/dma/dw/platform.c +++ b/drivers/dma/dw/platform.c @@ -41,7 +41,8 @@ static bool dw_dma_of_filter(struct dma_chan *chan, void *param) if (chan->device != &fargs->dw->dma) return false; - dwc->request_line = fargs->req; + dwc->src_id = fargs->req; + dwc->dst_id = fargs->req; dwc->src_master = fargs->src; dwc->dst_master = fargs->dst; @@ -86,7 +87,8 @@ static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param) chan->chan_id != dma_spec->chan_id) return false; - dwc->request_line = dma_spec->slave_id; + dwc->src_id = dma_spec->slave_id; + dwc->dst_id = dma_spec->slave_id; dwc->src_master = dwc_get_sms(NULL); dwc->dst_master = dwc_get_dms(NULL); diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h index af02439..0e82d99 100644 --- a/drivers/dma/dw/regs.h +++ b/drivers/dma/dw/regs.h @@ -221,9 +221,10 @@ struct dw_dma_chan { bool nollp; /* custom slave configuration */ - unsigned int request_line; - unsigned char src_master; - unsigned char dst_master; + u8 src_id; + u8 dst_id; + u8 src_master; + u8 dst_master; /* configuration passed via DMA_SLAVE_CONFIG */ struct dma_slave_config dma_sconfig; -- 2.1.0