From patchwork Sat Nov 5 18:59:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Jonathan_Neusch=C3=A4fer?= X-Patchwork-Id: 621856 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B609C43217 for ; Sat, 5 Nov 2022 18:59:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230000AbiKES7y (ORCPT ); Sat, 5 Nov 2022 14:59:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230047AbiKES7w (ORCPT ); Sat, 5 Nov 2022 14:59:52 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54CBF5FF6; Sat, 5 Nov 2022 11:59:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=s31663417; t=1667674768; bh=8Hp1zx/5xqPjJdBvcxGOdwOBXS460B5xQd0dp8zyAXc=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=R/FiV9Fg+SF9iBOFI1rcYT+poYx0llGUbBL2CU9PGJJ2IS4XLlGfI176v2lmd3Fl3 fXgqT1BXgP+HHQBUPrzdlcVYhQhLf4aRohbQ5ZVv36qlLCs5jQbYLEYt/u+PJpfhIM 544S4L3ZiOBLw11J7uwGE8Q5Mw9KtQvdR7u43qUDlnHccwfnMD31/Jk8i9AzclXFrg XrpGjKaNAwXA40Fq7yfqmBQDfFrG5kUlCys84tGJXU/5OBySSF5DAmnk2OEvDAyqsV jc5xQWFvH1uADn3QVB+VaLj6Ad69lExtdTYmikNBafsFVVbwxWTvmtegUvywymT5BY /EXF28mSUX3iw== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from probook ([87.78.44.193]) by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MXp5Q-1oWWYm1aay-00YChF; Sat, 05 Nov 2022 19:59:28 +0100 From: =?utf-8?q?Jonathan_Neusch=C3=A4fer?= To: linux-spi@vger.kernel.org, openbmc@lists.ozlabs.org Cc: Lee Jones , Rob Herring , Krzysztof Kozlowski , =?utf-8?q?Jonathan?= =?utf-8?q?_Neusch=C3=A4fer?= , Mark Brown , Linus Walleij , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH 8/8] spi: wpcm-fiu: Add direct map support Date: Sat, 5 Nov 2022 19:59:11 +0100 Message-Id: <20221105185911.1547847-9-j.neuschaefer@gmx.net> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221105185911.1547847-1-j.neuschaefer@gmx.net> References: <20221105185911.1547847-1-j.neuschaefer@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:9V2ZEZNXbUL5fJgOg60HwNFPLB73gmrjIGRAPTVp/sNNac9zK1d 5UDoJcPw0nIsuE7FZ8KCLcHIfz58KPYWQvdhIo8CIU/EzQuxHAHm+XT2KOdPqzrHG1NszEP m1ME/7xu25bTayYm4BJIW2aSreCn6fKWoCcFtacYiyGy+EEVfWp+0eTv4LcQu/mEKyDffyp 2r6iyMuxikbYLE3S4jMYA== UI-OutboundReport: notjunk:1;M01:P0:u4ojvdMZIts=;SlqvjLzK+y0Xc6K4ER98wtDp10q uHKtssdXHpWlIjADhYxl7EznuhbAE0IeW47bH3v502JnVxiGOYKlF1k8nWGKHJIT9rSqPgoyv YQNR3TGd5isFq3YCnnaqIdnBUQb/mQbqZS0nsdFcMkMMfBxwVrbNoXskbqN5605fPchKeUwX7 HxzzHcw//qyIdaCiTm4bB7osiSTF6rHA79YkHOX3L8r2htuL3RKDqxdyBMd2i7Xdrc4S/IZOH w8YWuc31nPkTQO4c2MLbrV00sfHXngzpBl7Bx/rZRQ4q5DJe4ZCogq56OL6TX7VtEiPJr5lmB qDLTaChbf8sMbaazK85199TXdUXuU1f7iobeBBWx/vsU14P9GTiLwmQ60Os2DybFD1kPa7jSy DyRGwOa4Jsc/coJzO5iqag6B6AQDp3PYb04GUDGHabGe34/MRXXAAM7Wse+x6kZf6BOss2chf ykHyVMxO4LJBYoAIBn2ooprsIHvjp+bkNc7MITPoOwk4DJ8lXOPPdNy44W5lblyAnzVYQv95h 4wzkhtvF1TToO6ij03q1T0UaKGvFCKSuadlZr8sSHizQzkm7k5Y5vqggMe27i4WHpJUYPldSb aMtySlOpQ2zjJBCKeUlIp/o7T8uzhfNA709QT4CLGAz0Xf8gp47RJWYPzEDYkQnWusvLTt4k7 nHMyaq2sl8ki3tTV1k+3Cxczu/3GdvDp/Btogtfv2CpL2J04y22EIJV3MTuGOhggW+sJcPm68 oVDTyBrhogKfmLzGBFsIdg82v9BP/mxACzcmGRAYWgYVuCKo8Eg+jfuy6pBZpqSGALUWZngKi kYHquwOhZBRzc9o6miGRwOGAuPlpyq7cAMZP99hqUYzdAKFUj5jsKscPtPGfCXTRAJ6r6dOU2 YN22BSncJRv9qmxSqYSgfhG6HEm0CpNhwBOwZViAT09ZTftJlgVuuzYBJREQ5i9Ap/5yeQrGY BCP2Mv7zoYoR+qrlQQhx2c59Y2Q= Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Besides software controlled SPI transfers (UMA, "user mode access"), FIU also supports a 16 MiB mapping window per attached flash chip. This patch implements direct mapped read access, to speed up flash reads. Without direct mapping: # time dd if=/dev/mtd0ro of=dump bs=1M 16+0 records in 16+0 records out real 1m 47.74s user 0m 0.00s sys 1m 47.75s With direct mapping: # time dd if=/dev/mtd0ro of=dump bs=1M 16+0 records in 16+0 records out real 0m 30.81s user 0m 0.00s sys 0m 30.81s Signed-off-by: Jonathan Neuschäfer --- drivers/spi/spi-wpcm-fiu.c | 64 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) -- 2.35.1 diff --git a/drivers/spi/spi-wpcm-fiu.c b/drivers/spi/spi-wpcm-fiu.c index d68693d4cd8bd..eda46c766ad9d 100644 --- a/drivers/spi/spi-wpcm-fiu.c +++ b/drivers/spi/spi-wpcm-fiu.c @@ -51,10 +51,16 @@ */ #define UMA_WAIT_ITERATIONS 100 +/* The memory-mapped view of flash is 16 MiB long */ +#define MAX_MEMORY_SIZE_PER_CS (16 << 20) +#define MAX_MEMORY_SIZE_TOTAL (4 * MAX_MEMORY_SIZE_PER_CS) + struct wpcm_fiu_spi { struct device *dev; struct clk *clk; void __iomem *regs; + void __iomem *memory; + size_t memory_size; struct regmap *shm_regmap; }; @@ -367,14 +373,64 @@ static int wpcm_fiu_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) return 0; } +static int wpcm_fiu_dirmap_create(struct spi_mem_dirmap_desc *desc) +{ + struct wpcm_fiu_spi *fiu = spi_controller_get_devdata(desc->mem->spi->controller); + int cs = desc->mem->spi->chip_select; + + if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN) + return -ENOTSUPP; + + /* + * Unfortunately, FIU only supports a 16 MiB direct mapping window (per + * attached flash chip), but the SPI MEM core doesn't support partial + * direct mappings. This means that we can't support direct mapping on + * flashes that are bigger than 16 MiB. + */ + if (desc->info.offset + desc->info.length > MAX_MEMORY_SIZE_PER_CS) + return -ENOTSUPP; + + /* Don't read past the memory window */ + if (cs * MAX_MEMORY_SIZE_PER_CS + desc->info.offset + desc->info.length > fiu->memory_size) + return -ENOTSUPP; + + return 0; +} + +static int wpcm_fiu_direct_read(struct spi_mem_dirmap_desc *desc, u64 offs, size_t len, void *buf) +{ + struct wpcm_fiu_spi *fiu = spi_controller_get_devdata(desc->mem->spi->controller); + int cs = desc->mem->spi->chip_select; + + if (offs >= MAX_MEMORY_SIZE_PER_CS) + return -ENOTSUPP; + + offs += cs * MAX_MEMORY_SIZE_PER_CS; + + if (!fiu->memory || offs >= fiu->memory_size) + return -ENOTSUPP; + + len = min_t(size_t, len, fiu->memory_size - offs); + memcpy_fromio(buf, fiu->memory + offs, len); + + return len; +} + static const struct spi_controller_mem_ops wpcm_fiu_mem_ops = { .adjust_op_size = wpcm_fiu_adjust_op_size, .supports_op = wpcm_fiu_supports_op, .exec_op = wpcm_fiu_exec_op, + .dirmap_create = wpcm_fiu_dirmap_create, + .dirmap_read = wpcm_fiu_direct_read, }; static void wpcm_fiu_hw_init(struct wpcm_fiu_spi *fiu) { + /* Configure memory-mapped flash access */ + writeb(FIU_BURST_CFG_R16, fiu->regs + FIU_BURST_BFG); + writeb(MAX_MEMORY_SIZE_TOTAL / (512 << 10), fiu->regs + FIU_CFG); + writeb(MAX_MEMORY_SIZE_PER_CS / (512 << 10) | BIT(6), fiu->regs + FIU_SPI_FL_CFG); + /* Deassert all manually asserted chip selects */ writeb(0x0f, fiu->regs + FIU_UMA_ECTS); } @@ -404,6 +460,14 @@ static int wpcm_fiu_probe(struct platform_device *pdev) if (IS_ERR(fiu->clk)) return PTR_ERR(fiu->clk); + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "memory"); + fiu->memory = devm_ioremap_resource(dev, res); + fiu->memory_size = min_t(size_t, resource_size(res), MAX_MEMORY_SIZE_TOTAL); + if (IS_ERR(fiu->regs)) { + dev_err(dev, "Failed to map flash memory window\n"); + return PTR_ERR(fiu->memory); + } + fiu->shm_regmap = syscon_regmap_lookup_by_phandle_optional(dev->of_node, "nuvoton,shm"); wpcm_fiu_hw_init(fiu);