From patchwork Tue Jun 28 16:20:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?C=C3=A9dric_Le_Goater?= X-Patchwork-Id: 1649637 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4LXVHd2vClz9sG2 for ; Wed, 29 Jun 2022 02:22:37 +1000 (AEST) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4LXVHd1jplz3dpR for ; Wed, 29 Jun 2022 02:22:37 +1000 (AEST) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4LXVFp2llsz3cdq for ; Wed, 29 Jun 2022 02:21:02 +1000 (AEST) Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4LXVFp2QT1z4xZ8; Wed, 29 Jun 2022 02:21:02 +1000 (AEST) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4LXVFm27vGz4xYL; Wed, 29 Jun 2022 02:21:00 +1000 (AEST) From: =?utf-8?q?C=C3=A9dric_Le_Goater?= To: openbmc@lists.ozlabs.org Subject: [PATCH linux 4/5] spi: aspeed: Handle custom decoding ranges Date: Tue, 28 Jun 2022 18:20:43 +0200 Message-Id: <20220628162044.1121337-5-clg@kaod.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220628162044.1121337-1-clg@kaod.org> References: <20220628162044.1121337-1-clg@kaod.org> MIME-Version: 1.0 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrew Jeffery , Chin-Ting Kuo , Naresh Solanki , Joel Stanley , =?utf-8?q?C=C3=A9dric_Le_Goater?= Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" "ranges" predefines settings of the decoding ranges for each CS. If found in the DT, the driver applies the settings at probe time. The default behavior is to set the decoding range of each CS using the flash device size when the spi slave is setup. Cc: Naresh Solanki Cc: Chin-Ting Kuo Signed-off-by: Cédric Le Goater --- drivers/spi/spi-aspeed-smc.c | 63 +++++++++++++++++++++++++++++++++++- 1 file changed, 62 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-aspeed-smc.c b/drivers/spi/spi-aspeed-smc.c index 1611c354c31f..791cbf753a85 100644 --- a/drivers/spi/spi-aspeed-smc.c +++ b/drivers/spi/spi-aspeed-smc.c @@ -101,6 +101,7 @@ struct aspeed_spi { u32 clk_freq; struct aspeed_spi_chip chips[ASPEED_SPI_MAX_NUM_CS]; + bool fixed_windows; }; static u32 aspeed_spi_get_io_mode(const struct spi_mem_op *op) @@ -574,7 +575,8 @@ static int aspeed_spi_dirmap_create(struct spi_mem_dirmap_desc *desc) if (op->data.dir != SPI_MEM_DATA_IN) return -EOPNOTSUPP; - aspeed_spi_chip_adjust_window(chip, desc->info.offset, desc->info.length); + if (!aspi->fixed_windows) + aspeed_spi_chip_adjust_window(chip, desc->info.offset, desc->info.length); if (desc->info.length > chip->ahb_window_size) dev_warn(aspi->dev, "CE%d window (%dMB) too small for mapping", @@ -749,6 +751,61 @@ static const struct attribute_group aspeed_spi_attribute_group = { .attrs = aspeed_spi_attributes }; +static int aspeed_spi_chip_read_ranges(struct device_node *node, struct aspeed_spi *aspi) +{ + const char *range_prop = "ranges"; + struct property *prop; + struct aspeed_spi_window ranges[ASPEED_SPI_MAX_NUM_CS]; + int prop_size; + int count; + int ret; + int i; + + prop = of_find_property(node, range_prop, &prop_size); + if (!prop) + return 0; + + count = prop_size / sizeof(*ranges); + if (count > aspi->data->max_cs) { + dev_err(aspi->dev, "invalid '%s' property %d\n", range_prop, count); + return -EINVAL; + } + + if (count < aspi->data->max_cs) + dev_dbg(aspi->dev, "'%s' property does not cover all CE\n", + range_prop); + + ret = of_property_read_u32_array(node, range_prop, (u32 *)ranges, count * 4); + if (ret) + return ret; + + dev_info(aspi->dev, "Using preset decoding ranges\n"); + for (i = 0; i < count; i++) { + struct aspeed_spi_window *win = &ranges[i]; + + if (win->cs > aspi->data->max_cs) { + dev_err(aspi->dev, "CE%d range is invalid", win->cs); + return -EINVAL; + } + + /* Trim top bit of the address to keep offset */ + win->offset &= aspi->ahb_window_size - 1; + + /* Minimal check */ + if (win->offset + win->size > aspi->ahb_window_size) { + dev_warn(aspi->dev, "CE%d range is too large", win->cs); + return -EINVAL; + } + + ret = aspeed_spi_set_window(aspi, win); + if (ret) + return ret; + } + + aspi->fixed_windows = true; + return 0; +} + static int aspeed_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -806,6 +863,10 @@ static int aspeed_spi_probe(struct platform_device *pdev) return ret; } + ret = aspeed_spi_chip_read_ranges(dev->of_node, aspi); + if (ret) + return ret; + /* IRQ is for DMA, which the driver doesn't support yet */ ctlr->mode_bits = SPI_RX_DUAL | SPI_TX_DUAL | data->mode_bits;