Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755096Ab2EBFMS (ORCPT ); Wed, 2 May 2012 01:12:18 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:40826 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753606Ab2EBFMQ (ORCPT ); Wed, 2 May 2012 01:12:16 -0400 From: Thomas Abraham To: linux-mmc@vger.kernel.org, devicetree-discuss@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, cjb@laptop.org, grant.likely@secretlab.ca, rob.herring@calxeda.com, linux-samsung-soc@vger.kernel.org, kgene.kim@samsung.com, patches@linaro.org Subject: [PATCH 1/7] mmc: dw_mmc: lookup for optional biu and ciu clocks Date: Tue, 1 May 2012 22:07:40 -0700 Message-Id: <1335935266-25289-2-git-send-email-thomas.abraham@linaro.org> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1335935266-25289-1-git-send-email-thomas.abraham@linaro.org> References: <1335935266-25289-1-git-send-email-thomas.abraham@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3251 Lines: 110 Some platforms allow for clock gating and control of bus interface unit clock and card interface unit clock. Add support for clock lookup of optional biu and ciu clocks for clock gating and clock speed determination. Signed-off-by: Abhilash Kesavan Signed-off-by: Thomas Abraham --- drivers/mmc/host/dw_mmc.c | 35 +++++++++++++++++++++++++++++++---- include/linux/mmc/dw_mmc.h | 4 ++++ 2 files changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 1532357..036846f 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1938,19 +1938,35 @@ int dw_mci_probe(struct dw_mci *host) return -ENODEV; } - if (!host->pdata->bus_hz) { + host->biu_clk = clk_get(&host->dev, "biu"); + if (IS_ERR(host->biu_clk)) + dev_info(&host->dev, "biu clock not available\n"); + else + clk_enable(host->biu_clk); + + host->ciu_clk = clk_get(&host->dev, "ciu"); + if (IS_ERR(host->ciu_clk)) + dev_info(&host->dev, "ciu clock not available\n"); + else + clk_enable(host->ciu_clk); + + if (IS_ERR(host->ciu_clk)) + host->bus_hz = host->pdata->bus_hz; + else + host->bus_hz = clk_get_rate(host->ciu_clk); + + if (!host->bus_hz) { dev_err(&host->dev, "Platform data must supply bus speed\n"); - return -ENODEV; + ret = -ENODEV; + goto err_clk; } - host->bus_hz = host->pdata->bus_hz; host->quirks = host->pdata->quirks; spin_lock_init(&host->lock); INIT_LIST_HEAD(&host->queue); - host->dma_ops = host->pdata->dma_ops; dw_mci_init_dma(host); @@ -2095,6 +2111,13 @@ err_dmaunmap: regulator_disable(host->vmmc); regulator_put(host->vmmc); } + kfree(host); + +err_clk: + clk_disable(host->ciu_clk); + clk_disable(host->biu_clk); + clk_put(host->ciu_clk); + clk_put(host->biu_clk); return ret; } EXPORT_SYMBOL(dw_mci_probe); @@ -2128,6 +2151,10 @@ void dw_mci_remove(struct dw_mci *host) regulator_put(host->vmmc); } + clk_disable(host->ciu_clk); + clk_disable(host->biu_clk); + clk_put(host->ciu_clk); + clk_put(host->biu_clk); } EXPORT_SYMBOL(dw_mci_remove); diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h index 7a7ebd3..fa9a139 100644 --- a/include/linux/mmc/dw_mmc.h +++ b/include/linux/mmc/dw_mmc.h @@ -78,6 +78,8 @@ struct mmc_data; * @data_offset: Set the offset of DATA register according to VERID. * @dev: Device associated with the MMC controller. * @pdata: Platform data associated with the MMC controller. + * @biu_clk: Pointer to bus interface unit clock instance. + * @ciu_clk: Pointer to card interface unit clock instance. * @slot: Slots sharing this MMC controller. * @fifo_depth: depth of FIFO. * @data_shift: log2 of FIFO item size. @@ -158,6 +160,8 @@ struct dw_mci { u16 data_offset; struct device dev; struct dw_mci_board *pdata; + struct clk *biu_clk; + struct clk *ciu_clk; struct dw_mci_slot *slot[MAX_MCI_SLOTS]; /* FIFO push and pull */ -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/