From patchwork Mon Oct 31 14:45:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 80202 Delivered-To: patch@linaro.org Received: by 10.140.97.247 with SMTP id m110csp154360qge; Mon, 31 Oct 2016 07:47:33 -0700 (PDT) X-Received: by 10.98.57.144 with SMTP id u16mr13820277pfj.142.1477925253721; Mon, 31 Oct 2016 07:47:33 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id wx5si20966233pab.108.2016.10.31.07.47.33; Mon, 31 Oct 2016 07:47:33 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@baylibre-com.20150623.gappssmtp.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965042AbcJaOrP (ORCPT + 27 others); Mon, 31 Oct 2016 10:47:15 -0400 Received: from mail-wm0-f50.google.com ([74.125.82.50]:36315 "EHLO mail-wm0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964955AbcJaOrI (ORCPT ); Mon, 31 Oct 2016 10:47:08 -0400 Received: by mail-wm0-f50.google.com with SMTP id p190so151822380wmp.1 for ; Mon, 31 Oct 2016 07:47:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Ax9T6GTnaajnh+iVgmvgAt76jhE1jXZH4w+XLtjW/E4=; b=qApEOlCw7iDCyrcIUiOFBoS+xenmE0vtXrt00NXWpwdGEVlDTXqdKAedRFLwJD8RRf TbYqH03wvao0Qc6X3yrwIFllfR71TkaDplmFfG0dNXmg4S46xaYzdM9patSJ09pHqSiN 7yW+zsqVdpLNnn4xHRoC6COFu7D2+y2KWsZeX7vf9pdoD+IqJIqLqJTJEtQAa/+c8bG/ un/iRIiN97TAlVaquz1u6q1+TRJzB8VCq4Fz6pJPX9Qn6/x1Ng8jOd1QPTv5wczLIeDY PIC7fCyc/5JT3bCYIZ+O1A8VdbX+Ktu8WA26GnIrgRhP9dszlidH9GngID2sF460cnRQ Pzcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Ax9T6GTnaajnh+iVgmvgAt76jhE1jXZH4w+XLtjW/E4=; b=ZGA+cJTQmPXuuwz1K264USLRCPLJDx0QWTPExiKW/qL9qxZXN/LkMClkvcZJnXI9O7 /F4pCct60zLSu7LanxvOTRZuPJewdj616s4ENbOsLBGFFeYnxXNT0OGpKFZ3b0AjWxxa qGbY3ZGdBPsRGCRbCNcNQ0TQxw7Pkt9pRiaj8EjZPaDDpoJNmo7rbG1xXfea/U/7edf0 2n29sXwGOO28ss+nvC2xhALXAx8pYHE5cRt174wGic9sTQMaD4osl6YsfreDneEwuow5 IHb+WaaEbg+5ng9jvsRKR1FQOTzVG3KOymtBjS1tr2OV+zwnEd3C6yaG5LBZP825sidf dR1g== X-Gm-Message-State: ABUngve087Hax7dMLf3J0Ob4nr5F1kDrBibVBsPptCLArfPbTqxpKzyvkIgSGwEdaH159FrJ X-Received: by 10.28.52.197 with SMTP id b188mr11724677wma.52.1477925226283; Mon, 31 Oct 2016 07:47:06 -0700 (PDT) Received: from localhost.localdomain ([90.63.244.31]) by smtp.gmail.com with ESMTPSA id 1sm25129100wmk.22.2016.10.31.07.47.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 31 Oct 2016 07:47:05 -0700 (PDT) From: Bartosz Golaszewski To: Kevin Hilman , Michael Turquette , Sekhar Nori , Rob Herring , Frank Rowand , Mark Rutland , Peter Ujfalusi , Russell King Cc: LKML , arm-soc , linux-drm , linux-devicetree , Jyri Sarha , Tomi Valkeinen , David Airlie , Laurent Pinchart , Bartosz Golaszewski Subject: [PATCH v2 2/5] ARM: bus: da8xx-mstpri: new driver Date: Mon, 31 Oct 2016 15:45:35 +0100 Message-Id: <1477925138-23457-3-git-send-email-bgolaszewski@baylibre.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1477925138-23457-1-git-send-email-bgolaszewski@baylibre.com> References: <1477925138-23457-1-git-send-email-bgolaszewski@baylibre.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Create the driver for the da8xx master peripheral priority configuration and implement support for writing to the three Master Priority registers on da850 SoCs. Signed-off-by: Bartosz Golaszewski --- .../devicetree/bindings/bus/ti,da850-mstpri.txt | 20 ++ drivers/bus/Kconfig | 9 + drivers/bus/Makefile | 2 + drivers/bus/da8xx-mstpri.c | 269 +++++++++++++++++++++ 4 files changed, 300 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/ti,da850-mstpri.txt create mode 100644 drivers/bus/da8xx-mstpri.c -- 2.9.3 diff --git a/Documentation/devicetree/bindings/bus/ti,da850-mstpri.txt b/Documentation/devicetree/bindings/bus/ti,da850-mstpri.txt new file mode 100644 index 0000000..72daefc --- /dev/null +++ b/Documentation/devicetree/bindings/bus/ti,da850-mstpri.txt @@ -0,0 +1,20 @@ +* Device tree bindings for Texas Instruments da8xx master peripheral + priority driver + +DA8XX SoCs feature a set of registers allowing to change the priority of all +peripherals classified as masters. + +Documentation: +OMAP-L138 (DA850) - http://www.ti.com/lit/ug/spruh82c/spruh82c.pdf + +Required properties: + +- compatible: "ti,da850-mstpri" - for da850 based boards +- reg: offset and length of the mstpri registers + +Example for da850-lcdk is shown below. + +mstpri { + compatible = "ti,da850-mstpri"; + reg = <0x14110 0x0c>; +}; diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 7875105..f5db3a7 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -167,4 +167,13 @@ config VEXPRESS_CONFIG help Platform configuration infrastructure for the ARM Ltd. Versatile Express. + +config DA8XX_MSTPRI + bool "TI da8xx master peripheral priority driver" + depends on ARCH_DAVINCI_DA8XX + help + Driver for Texas Instruments da8xx master peripheral priority + configuration. Allows to adjust the priorities of all master + peripherals. + endmenu diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index c6cfa6b..2adb540 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -21,3 +21,5 @@ obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o obj-$(CONFIG_TEGRA_ACONNECT) += tegra-aconnect.o obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o + +obj-$(CONFIG_DA8XX_MSTPRI) += da8xx-mstpri.o diff --git a/drivers/bus/da8xx-mstpri.c b/drivers/bus/da8xx-mstpri.c new file mode 100644 index 0000000..85f0b53 --- /dev/null +++ b/drivers/bus/da8xx-mstpri.c @@ -0,0 +1,269 @@ +/* + * TI da8xx master peripheral priority driver + * + * Copyright (C) 2016 BayLibre SAS + * + * Author: + * Bartosz Golaszewski + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include + +/* + * REVISIT: Linux doesn't have a good framework for the kind of performance + * knobs this driver controls. We can't use device tree properties as it deals + * with hardware configuration rather than description. We also don't want to + * commit to maintaining some random sysfs attributes. + * + * For now we just hardcode the register values for the boards that need + * some changes (as is the case for the LCD controller on da850-lcdk - the + * first board we support here). When linux gets an appropriate framework, + * we'll easily convert the driver to it. + */ + +#define DA8XX_MSTPRI0_OFFSET 0 +#define DA8XX_MSTPRI1_OFFSET 4 +#define DA8XX_MSTPRI2_OFFSET 8 + +enum { + DA8XX_MSTPRI_ARM_I = 0, + DA8XX_MSTPRI_ARM_D, + DA8XX_MSTPRI_UPP, + DA8XX_MSTPRI_SATA, + DA8XX_MSTPRI_PRU0, + DA8XX_MSTPRI_PRU1, + DA8XX_MSTPRI_EDMA30TC0, + DA8XX_MSTPRI_EDMA30TC1, + DA8XX_MSTPRI_EDMA31TC0, + DA8XX_MSTPRI_VPIF_DMA_0, + DA8XX_MSTPRI_VPIF_DMA_1, + DA8XX_MSTPRI_EMAC, + DA8XX_MSTPRI_USB0CFG, + DA8XX_MSTPRI_USB0CDMA, + DA8XX_MSTPRI_UHPI, + DA8XX_MSTPRI_USB1, + DA8XX_MSTPRI_LCDC, +}; + +struct da8xx_mstpri_descr { + int reg; + int shift; + int mask; +}; + +static const struct da8xx_mstpri_descr da8xx_mstpri_priority_list[] = { + [DA8XX_MSTPRI_ARM_I] = { + .reg = DA8XX_MSTPRI0_OFFSET, + .shift = 0, + .mask = 0x0000000f, + }, + [DA8XX_MSTPRI_ARM_D] = { + .reg = DA8XX_MSTPRI0_OFFSET, + .shift = 4, + .mask = 0x000000f0, + }, + [DA8XX_MSTPRI_UPP] = { + .reg = DA8XX_MSTPRI0_OFFSET, + .shift = 16, + .mask = 0x000f0000, + }, + [DA8XX_MSTPRI_SATA] = { + .reg = DA8XX_MSTPRI0_OFFSET, + .shift = 20, + .mask = 0x00f00000, + }, + [DA8XX_MSTPRI_PRU0] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 0, + .mask = 0x0000000f, + }, + [DA8XX_MSTPRI_PRU1] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 4, + .mask = 0x000000f0, + }, + [DA8XX_MSTPRI_EDMA30TC0] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 8, + .mask = 0x00000f00, + }, + [DA8XX_MSTPRI_EDMA30TC1] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 12, + .mask = 0x0000f000, + }, + [DA8XX_MSTPRI_EDMA31TC0] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 16, + .mask = 0x000f0000, + }, + [DA8XX_MSTPRI_VPIF_DMA_0] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 24, + .mask = 0x0f000000, + }, + [DA8XX_MSTPRI_VPIF_DMA_1] = { + .reg = DA8XX_MSTPRI1_OFFSET, + .shift = 28, + .mask = 0xf0000000, + }, + [DA8XX_MSTPRI_EMAC] = { + .reg = DA8XX_MSTPRI2_OFFSET, + .shift = 0, + .mask = 0x0000000f, + }, + [DA8XX_MSTPRI_USB0CFG] = { + .reg = DA8XX_MSTPRI2_OFFSET, + .shift = 8, + .mask = 0x00000f00, + }, + [DA8XX_MSTPRI_USB0CDMA] = { + .reg = DA8XX_MSTPRI2_OFFSET, + .shift = 12, + .mask = 0x0000f000, + }, + [DA8XX_MSTPRI_UHPI] = { + .reg = DA8XX_MSTPRI2_OFFSET, + .shift = 20, + .mask = 0x00f00000, + }, + [DA8XX_MSTPRI_USB1] = { + .reg = DA8XX_MSTPRI2_OFFSET, + .shift = 24, + .mask = 0x0f000000, + }, + [DA8XX_MSTPRI_LCDC] = { + .reg = DA8XX_MSTPRI2_OFFSET, + .shift = 28, + .mask = 0xf0000000, + }, +}; + +struct da8xx_mstpri_priority { + int which; + u32 val; +}; + +struct da8xx_mstpri_board_priorities { + const char *board; + const struct da8xx_mstpri_priority *priorities; + size_t numprio; +}; + +/* + * Default memory settings of da850 do not meet the throughput/latency + * requirements of tilcdc. This results in the image displayed being + * incorrect and the following warning being displayed by the LCDC + * drm driver: + * + * tilcdc da8xx_lcdc.0: tilcdc_crtc_irq(0x00000020): FIFO underfow + */ +static const struct da8xx_mstpri_priority da850_lcdk_priorities[] = { + { + .which = DA8XX_MSTPRI_LCDC, + .val = 0, + }, + { + .which = DA8XX_MSTPRI_EDMA30TC1, + .val = 0, + }, + { + .which = DA8XX_MSTPRI_EDMA30TC0, + .val = 1, + }, +}; + +static const struct da8xx_mstpri_board_priorities da8xx_mstpri_board_confs[] = { + { + .board = "ti,da850-lcdk", + .priorities = da850_lcdk_priorities, + .numprio = ARRAY_SIZE(da850_lcdk_priorities), + }, +}; + +static const struct da8xx_mstpri_board_priorities * +da8xx_mstpri_get_board_prio(void) +{ + const struct da8xx_mstpri_board_priorities *board_prio; + int i; + + for (i = 0; i < ARRAY_SIZE(da8xx_mstpri_board_confs); i++) { + board_prio = &da8xx_mstpri_board_confs[i]; + + if (of_machine_is_compatible(board_prio->board)) + return board_prio; + } + + return NULL; +} + +static int da8xx_mstpri_probe(struct platform_device *pdev) +{ + const struct da8xx_mstpri_board_priorities *prio_list; + const struct da8xx_mstpri_descr *prio_descr; + const struct da8xx_mstpri_priority *prio; + struct device *dev = &pdev->dev; + struct resource *res; + void __iomem *mstpri; + u32 reg; + int i; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mstpri = devm_ioremap_resource(dev, res); + if (IS_ERR(mstpri)) { + dev_err(dev, "unable to map MSTPRI registers\n"); + return PTR_ERR(mstpri); + } + + prio_list = da8xx_mstpri_get_board_prio(); + if (!prio_list) { + dev_err(dev, "no master priotities defined for board '%s'\n", + of_flat_dt_get_machine_name()); + return -EINVAL; + } + + for (i = 0; i < prio_list->numprio; i++) { + prio = &prio_list->priorities[i]; + prio_descr = &da8xx_mstpri_priority_list[prio->which]; + + if (prio_descr->reg + sizeof(u32) > resource_size(res)) { + dev_warn(dev, "register offset out of range\n"); + continue; + } + + reg = readl(mstpri + prio_descr->reg); + reg &= ~prio_descr->mask; + reg |= prio->val << prio_descr->shift; + + writel(reg, mstpri + prio_descr->reg); + } + + return 0; +} + +static const struct of_device_id da8xx_mstpri_of_match[] = { + { .compatible = "ti,da850-mstpri", }, + { }, +}; + +static struct platform_driver da8xx_mstpri_driver = { + .probe = da8xx_mstpri_probe, + .driver = { + .name = "da8xx-mstpri", + .of_match_table = da8xx_mstpri_of_match, + }, +}; +module_platform_driver(da8xx_mstpri_driver); + +MODULE_AUTHOR("Bartosz Golaszewski "); +MODULE_DESCRIPTION("TI da8xx master peripheral priority driver"); +MODULE_LICENSE("GPL v2");