From patchwork Sun Aug 26 11:52:04 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Abraham X-Patchwork-Id: 1374791 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 02191DFABE for ; Sun, 26 Aug 2012 11:34:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752126Ab2HZLe1 (ORCPT ); Sun, 26 Aug 2012 07:34:27 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:51994 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753583Ab2HZLeZ (ORCPT ); Sun, 26 Aug 2012 07:34:25 -0400 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0M9D004031HCOI10@mailout3.samsung.com>; Sun, 26 Aug 2012 20:34:24 +0900 (KST) X-AuditID: cbfee61b-b7faf6d00000476a-c4-503a09c06929 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id E6.E9.18282.0C90A305; Sun, 26 Aug 2012 20:34:24 +0900 (KST) Received: from localhost.localdomain ([107.108.73.37]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0M9D00AQQ1GN7UA0@mmp1.samsung.com>; Sun, 26 Aug 2012 20:34:24 +0900 (KST) From: Thomas Abraham To: linux-mmc@vger.kernel.org, devicetree-discuss@lists.ozlabs.org Cc: cjb@laptop.org, grant.likely@secretlab.ca, rob.herring@calxeda.com, linux-samsung-soc@vger.kernel.org, kgene.kim@samsung.com, girish.shivananjappa@linaro.org, jh80.chung@samsung.com, tgih.jun@samsung.com, patches@linaro.org Subject: [PATCH v4 6/9] mmc: dw_mmc: add device tree support Date: Sun, 26 Aug 2012 17:22:04 +0530 Message-id: <1345981927-26359-7-git-send-email-thomas.abraham@linaro.org> X-Mailer: git-send-email 1.6.6.rc2 In-reply-to: <1345981927-26359-1-git-send-email-thomas.abraham@linaro.org> References: <1345981927-26359-1-git-send-email-thomas.abraham@linaro.org> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBJMWRmVeSWpSXmKPExsVy+t9jAd0DnFYBBtPnSFsc+d/PaDHj/D4m ByaPz5vkAhijuGxSUnMyy1KL9O0SuDKW9fWxFUwPqDh08z57A+MRhy5GTg4JAROJa/9esEPY YhIX7q1n62Lk4hASWMQo8e9TCyuE08YkcWrWFUaQKjYBA4lHC9+BdYgIOEksmTuBGaSIWeAl o8TMXTPZQBLCAjYSh48fYQGxWQRUJc68vcAMYvMKeEpMu3mVEWKdksSG3qNMIDangJfEjUWt YEOFgGqOz/jOOIGRdwEjwypG0dSC5ILipPRcI73ixNzi0rx0veT83E2MYP8/k97BuKrB4hCj AAejEg+vQKllgBBrYllxZe4hRgkOZiUR3u/7gUK8KYmVValF+fFFpTmpxYcYpTlYlMR5+fsM A4QE0hNLUrNTUwtSi2CyTBycUg2MFc28MSvXWi7q6+W+UCgjcPrZpi+7mfv1E7PV/3M9vP3p 9YysdIay01OW3TByVJKSrp2wOZpXdObcrNwTUts3rlYz6lpzPV65oDs48MMH3/6yW8kXv+qd 3nRTtvn4y8Xq8b6fOqt2vXL629K9bl3fJt29mRfYFs8u5WSd8m31nMh3clWLT3jHKrEUZyQa ajEXFScCALIieDX7AQAA Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Add device tree based discovery support. Signed-off-by: Thomas Abraham --- .../devicetree/bindings/mmc/synposis-dw-mshc.txt | 90 ++++++++++++++ drivers/mmc/host/dw_mmc-pltfm.c | 9 ++ drivers/mmc/host/dw_mmc.c | 130 ++++++++++++++++++- 3 files changed, 222 insertions(+), 7 deletions(-) create mode 100644 Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt diff --git a/Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt new file mode 100644 index 0000000..790b1bf --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt @@ -0,0 +1,90 @@ +* Synopsis Designware Mobile Storage Host Controller + +The Synopsis designware mobile storage host controller is used to interface +a SoC with storage medium such as eMMC or SD/MMC cards. This file documents +differences between the core mmc properties described by mmc.txt and the +properties used by the Synopsis Designware Mobile Storage Host Controller. + +Required Properties: + +* compatible: should be + - snps,dw-mshc: for controllers compliant with synopsis dw-mshc. +* #address-cells: should be 1. +* #size-cells: should be 0. + +# Slots: The slot specific information are contained within child-nodes with + each child-node representing a supported slot. There should be atleast one + child node representing a card slot. The name of the child node representing + the slot is recommended to be slot@n where n is the unique number of the slot + connnected to the controller. The following are optional properties which + can be included in the slot child node. + + * reg: specifies the physical slot number. The valid values of this + property is 0 to (num-slots -1), where num-slots is the value + specified by the num-slots property. + + * bus-width: as documented in mmc core bindings. + + * wp-gpios: specifies the write protect gpio line. The format of the + gpio specifier depends on the gpio controller. If the write-protect + line is not available, this property is optional. + + * gpios: specifies a list of gpios used for command, clock and data + bus. The first gpio is the command line and the second gpio is the + clock line. The rest of the gpios (depending on the bus-width + property) are the data lines in no particular order. The format of + the gpio specifier depends on the gpio controller. + +Optional properties: + +* num-slots: specifies the number of slots supported by the controller. + The number of physical slots actually used could be equal or less than the + value specified by num-slots. If this property is not specified, the value + of num-slot property is assumed to be 1. + +* fifo-depth: The maximum size of the tx/rx fifo's. If this property is not + specified, the default value of the fifo size is determined from the + controller registers. + +* card-detect-delay: Delay in milli-seconds before detecting card after card + insert event. The default value is 0. + +* supports-highspeed: Enables support for high speed cards (upto 50MHz) + +* broken-cd: as documented in mmc core bindings. + +Aliases: + +- All the MSHC controller nodes should be represented in the aliases node using + the following format 'mshc{n}' where n is a unique number for the alias. + +Example: + +The MSHC controller node can be split into two portions, SoC specific and +board specific portions as listed below. + + dwmmc0@12200000 { + compatible = "snps,dw-mshc"; + reg = <0x12200000 0x1000>; + interrupts = <0 75 0>; + #address-cells = <1>; + #size-cells = <0>; + }; + + dwmmc0@12200000 { + num-slots = <1>; + supports-highspeed; + broken-cd; + fifo-depth = <0x80>; + card-detect-delay = <200>; + + slot@0 { + reg = <0>; + bus-width = <8>; + gpios = <&gpc0 0 2 0 3>, <&gpc0 1 2 0 3>, + <&gpc1 0 2 3 3>, <&gpc1 1 2 3 3>, + <&gpc1 2 2 3 3>, <&gpc1 3 2 3 3>, + <&gpc0 3 2 3 3>, <&gpc0 4 2 3 3>, + <&gpc0 5 2 3 3>, <&gpc0 6 2 3 3>; + }; + }; diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c index 1488b17..25c5f11 100644 --- a/drivers/mmc/host/dw_mmc-pltfm.c +++ b/drivers/mmc/host/dw_mmc-pltfm.c @@ -19,6 +19,8 @@ #include #include #include +#include + #include "dw_mmc.h" static int dw_mci_pltfm_probe(struct platform_device *pdev) @@ -94,10 +96,17 @@ static int dw_mci_pltfm_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume); +static const struct of_device_id dw_mci_pltfm_match[] = { + { .compatible = "snps,dw-mshc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match); + static struct platform_driver dw_mci_pltfm_driver = { .remove = __exit_p(dw_mci_pltfm_remove), .driver = { .name = "dw_mmc", + .of_match_table = of_match_ptr(dw_mci_pltfm_match), .pm = &dw_mci_pltfm_pmops, }, }; diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 075f89d..b8ec067 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -33,6 +33,7 @@ #include #include #include +#include #include "dw_mmc.h" @@ -1762,10 +1763,57 @@ static void dw_mci_work_routine_card(struct work_struct *work) } } +#ifdef CONFIG_OF +/* given a slot id, find out the device node representing that slot */ +static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot) +{ + struct device_node *np; + const __be32 *addr; + int len; + + if (!dev || !dev->of_node) + return NULL; + + for_each_child_of_node(dev->of_node, np) { + addr = of_get_property(np, "reg", &len); + if (!addr || (len < sizeof(int))) + continue; + if (be32_to_cpup(addr) == slot) + return np; + } + return NULL; +} + +/* find out bus-width for a given slot */ +static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot) +{ + struct device_node *np = dw_mci_of_find_slot_node(dev, slot); + u32 bus_wd = 1; + + if (!np) + return 1; + + if (of_property_read_u32(np, "bus-width", &bus_wd)) + dev_err(dev, "bus-width property not found, assuming width" + " as 1\n"); + return bus_wd; +} +#else /* CONFIG_OF */ +static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot) +{ + return 1; +} +static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot) +{ + return NULL; +} +#endif /* CONFIG_OF */ + static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id) { struct mmc_host *mmc; struct dw_mci_slot *slot; + u8 bus_width; mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev); if (!mmc) @@ -1775,6 +1823,7 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id) slot->id = id; slot->mmc = mmc; slot->host = host; + host->slot[id] = slot; mmc->ops = &dw_mci_ops; mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510); @@ -1799,8 +1848,18 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id) mmc->caps2 = host->pdata->caps2; if (host->pdata->get_bus_wd) - if (host->pdata->get_bus_wd(slot->id) >= 4) - mmc->caps |= MMC_CAP_4_BIT_DATA; + bus_width = host->pdata->get_bus_wd(slot->id); + else if (host->dev->of_node) + bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id); + else + bus_width = 1; + + switch (bus_width) { + case 8: + mmc->caps |= MMC_CAP_8_BIT_DATA; + case 4: + mmc->caps |= MMC_CAP_4_BIT_DATA; + } if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED) mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; @@ -1845,7 +1904,6 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id) else clear_bit(DW_MMC_CARD_PRESENT, &slot->flags); - host->slot[id] = slot; mmc_add_host(mmc); #if defined(CONFIG_DEBUG_FS) @@ -1937,16 +1995,74 @@ static bool mci_wait_reset(struct device *dev, struct dw_mci *host) return false; } +#ifdef CONFIG_OF +static struct dw_mci_of_quirks { + char *quirk; + int id; +} of_quirks[] = { + { + .quirk = "supports-highspeed", + .id = DW_MCI_QUIRK_HIGHSPEED, + }, { + .quirk = "broken-cd", + .id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION, + }, +}; + +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) +{ + struct dw_mci_board *pdata; + struct device *dev = host->dev; + struct device_node *np = dev->of_node; + int idx; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + dev_err(dev, "could not allocate memory for pdata\n"); + return ERR_PTR(-ENOMEM); + } + + /* find out number of slots supported */ + if (of_property_read_u32(dev->of_node, "num-slots", + &pdata->num_slots)) { + dev_info(dev, "num-slots property not found, " + "assuming 1 slot is available\n"); + pdata->num_slots = 1; + } + + /* get quirks */ + for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++) + if (of_get_property(np, of_quirks[idx].quirk, NULL)) + pdata->quirks |= of_quirks[idx].id; + + if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth)) + dev_info(dev, "fifo-depth property not found, using " + "value of FIFOTH register as default\n"); + + of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms); + + return pdata; +} + +#else /* CONFIG_OF */ +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) +{ + return ERR_PTR(-EINVAL); +} +#endif /* CONFIG_OF */ + int dw_mci_probe(struct dw_mci *host) { int width, i, ret = 0; u32 fifo_size; int init_slots = 0; - if (!host->pdata || !host->pdata->init) { - dev_err(host->dev, - "Platform data must supply init function\n"); - return -ENODEV; + if (!host->pdata) { + host->pdata = dw_mci_parse_dt(host); + if (IS_ERR(host->pdata)) { + dev_err(host->dev, "platform data not available\n"); + return -EINVAL; + } } if (!host->pdata->select_slot && host->pdata->num_slots > 1) {