From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Tue, 14 Jun 2022 21:09:12 +0200 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1o1BuZ-002Q5R-8U for lore@lore.pengutronix.de; Tue, 14 Jun 2022 21:09:12 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1o1BuY-0007cF-Cv for lore@pengutronix.de; Tue, 14 Jun 2022 21:09:11 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; 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Tue, 14 Jun 2022 21:07:05 +0200 Message-ID: <8af39019-b398-4b2a-7739-22f48cac7532@pengutronix.de> Date: Tue, 14 Jun 2022 21:07:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Content-Language: en-US To: =?UTF-8?Q?Daniel_Br=c3=a1t?= , barebox@lists.infradead.org References: <20220613211651.14454-1-danek.brat@gmail.com> From: Ahmad Fatoum In-Reply-To: <20220613211651.14454-1-danek.brat@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220614_120710_517031_9D8956FE X-CRM114-Status: GOOD ( 34.71 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.8 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE, SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH v2] ARM: rpi: parse useful data from vc fdt X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) Hello Daniel, On 13.06.22 23:16, Daniel Brát wrote: > Videocore first-stage loader on rpi passes us many useful information > inside the vc fdt, including the real value of PM_RSTS register, not > easily available by other means and which we can use to determine > the reset cause. > Also make the relevant funtions just print error/warning and continue > in case of some errors, since the fdt from vc is now optional for > barebox's basic function. > > Signed-off-by: Daniel Brát > --- > arch/arm/boards/raspberry-pi/rpi-common.c | 200 +++++++++++++++++----- > drivers/watchdog/bcm2835_wdt.c | 23 +-- > include/soc/bcm283x/wdt.h | 40 +++++ > 3 files changed, 200 insertions(+), 63 deletions(-) > create mode 100644 include/soc/bcm283x/wdt.h > > diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c > index 12a4f4a0a..5d2196986 100644 > --- a/arch/arm/boards/raspberry-pi/rpi-common.c > +++ b/arch/arm/boards/raspberry-pi/rpi-common.c > @@ -23,13 +23,27 @@ > #include > #include > #include > +#include > > #include > #include > #include > > +#include > + > #include "lowlevel.h" > > +//https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#BOOT_ORDER > +static const char * const boot_mode_names[] = { [0x0] = "unknown" I am not sure how devinfo global would look like if there are NULL members. > + [0x1] = "sd", > + [0x2] = "net", > + [0x3] = "rpiboot", > + [0x4] = "usbmsd", > + [0x5] = "usbc", > + [0x6] = "nvme", > + [0x7] = "http", > +}; > + > struct rpi_priv; > struct rpi_machine_data { > int (*init)(struct rpi_priv *priv); > @@ -186,54 +200,151 @@ static int rpi_env_init(void) > return 0; > } > > -/* Extract /chosen/bootargs from the VideoCore FDT into vc.bootargs > - * global variable. */ > -static int rpi_vc_fdt_bootargs(void *fdt) > +/* Extract useful information from the VideoCore FDT we got. > + * Some parameters are defined here: > + * https://www.raspberrypi.com/documentation/computers/configuration.html#part4 > + */ > +static void rpi_vc_fdt_parse(void *fdt) > { > - int ret = 0; > - struct device_node *root = NULL, *node; > - const char *cmdline; > + int ret, len; > + struct device_node *root, *chosen, *bootloader; > + enum reset_src_type rst_src = RESET_UKWN; > + const char *str; > + char *dynstr; > + u32 num, *pnum; > > root = of_unflatten_dtb(fdt, INT_MAX); > - if (IS_ERR(root)) { > - ret = PTR_ERR(root); > - root = NULL; > - goto out; > + if (IS_ERR(root)) > + return; > + > + str = of_get_property(root, "serial-number", &len); > + if (!str) { > + pr_warn("no 'serial-number' property found in vc fdt\n"); > + } else { > + if (str[len - 1] == '\0') { > + barebox_set_serial_number(str); > + } else { > + pr_warn("Malformed property 'serial-number' (not null " > + "terminated)\n"); > + dynstr = xstrndup(str, len); > + barebox_set_serial_number(dynstr); > + free(dynstr); > + } > } Sorry, some miscommunication here. Just use your normal approach in the else clause. I had forgotten that some of these properties are malformed. You can also drop the warning message about null termination here. > > - node = of_find_node_by_path_from(root, "/chosen"); > - if (!node) { > - pr_err("no /chosen node\n"); > - ret = -ENOENT; > - goto out; > + str = of_get_property(root, "model", &len); > + if (!str) { > + pr_warn("no 'model' property found in vc fdt\n"); > + } else { > + if (str[len - 1] == '\0') { > + barebox_set_model(str); > + } else { > + pr_warn("Malformed property 'model' (not null " > + "terminated)\n"); As above. > + dynstr = xstrndup(str, len); > + barebox_set_model(dynstr); > + free(dynstr); > + } > } > > - cmdline = of_get_property(node, "bootargs", NULL); > - if (!cmdline) { > - pr_err("no bootargs property in the /chosen node\n"); > - ret = -ENOENT; > + chosen = of_find_node_by_path_from(root, "/chosen"); > + if (!chosen) { > + pr_err("no '/chosen' node found in vc fdt\n"); > goto out; > } > > - globalvar_add_simple("vc.bootargs", cmdline); > + bootloader = of_find_node_by_name(chosen, "bootloader"); > > - switch(cpu_architecture()) { > - case CPU_ARCH_ARMv6: > - globalvar_add_simple("vc.kernel", "kernel.img"); > - break; > - case CPU_ARCH_ARMv7: > - globalvar_add_simple("vc.kernel", "kernel7.img"); > - break; > - case CPU_ARCH_ARMv8: > - globalvar_add_simple("vc.kernel", "kernel8.img"); > - break; > + str = of_get_property(chosen, "bootargs", &len); > + if (!str) { > + pr_warn("no 'bootargs' property in the /chosen node\n"); > + } else { > + if (str[len - 1] == '\0') { > + globalvar_add_simple("vc.bootargs", str); > + } else { > + pr_warn("Malformed property 'bootargs' (not null " > + "terminated)\n"); > + globalvar_add_simple("vc.bootargs", xstrndup(str, len)); > + } > + } > + > + str = of_get_property(chosen, "overlay_prefix", &len); > + if (!str) { > + pr_warn("no 'overlay_prefix' property in the /chosen node\n"); > + } else { > + if (str[len - 1] == '\0'){ > + globalvar_add_simple("vc.overlay_prefix", str); > + } else { > + pr_warn("Malformed property 'overlay_prefix' (not null " > + "terminated)\n"); > + globalvar_add_simple("vc.overlay_prefix", > + xstrndup(str, len)); > + } > + } > + > + str = of_get_property(chosen, "os_prefix", &len); > + if (!str) { > + pr_warn("no 'os_prefix' property in the /chosen node\n"); > + } else { > + if (str[len - 1] == '\0') { > + globalvar_add_simple("vc.os_prefix", str); > + } else { > + pr_warn("Malformed property 'os_prefix' (not null " > + "terminated)\n"); > + globalvar_add_simple("vc.os_prefix", xstrndup(str, len)); > + } > + } > + > + ret = of_property_read_u32(chosen, "boot-mode", &num); > + if (ret && bootloader) > + ret = of_property_read_u32(bootloader, "boot-mode", &num); > + if (ret) { > + pr_warn("'boot-mode' property not found\n"); > + } else { > + pnum = xmalloc(sizeof(u32)); > + *pnum = num; > + globalvar_add_simple_enum("vc.boot_mode", pnum, > + boot_mode_names, > + ARRAY_SIZE(boot_mode_names)); > } > > + ret = of_property_read_u32(chosen, "partition", &num); > + if (ret && bootloader) > + ret = of_property_read_u32(bootloader, "partition", &num); > + if (ret) { > + pr_warn("'partition' property not found\n"); > + } else { > + pnum = xmalloc(sizeof(u32)); > + *pnum = num; > + globalvar_add_simple_int("vc.boot_partition", pnum, "%u"); > + } > + > + if (IS_ENABLED(CONFIG_RESET_SOURCE)) { > + ret = of_property_read_u32(chosen, "pm_rsts", &num); > + if (ret && bootloader) > + ret = of_property_read_u32(bootloader, "rsts", &num); > + > + if (ret) { > + pr_warn("'pm_rsts'/'rsts' property not found\n"); > + } else { > +/* > + * https://github.com/raspberrypi/linux/issues/932#issuecomment-93989581 > + */ > + if (num & PM_RSTS_HADPOR_SET) > + rst_src = RESET_POR; > + else if (num & PM_RSTS_HADDR_SET) > + rst_src = RESET_JTAG; > + else if (num & PM_RSTS_HADWR_SET) > + rst_src = RESET_WDG; > + else if (num & PM_RSTS_HADSR_SET) > + rst_src = RESET_RST; > + reset_source_set(rst_src); > + } > + } > out: > if (root) > of_delete_node(root); > - > - return ret; > + return; > } > > static void rpi_vc_fdt(void) > @@ -241,7 +352,6 @@ static void rpi_vc_fdt(void) > void *saved_vc_fdt; > struct fdt_header *oftree; > unsigned long magic, size; > - int ret; > > /* VideoCore FDT was copied in PBL just above Barebox memory */ > saved_vc_fdt = (void *)(arm_mem_endmem_get()); > @@ -260,16 +370,23 @@ static void rpi_vc_fdt(void) > return; > > size = be32_to_cpu(oftree->totalsize); > - if (write_file("/vc.dtb", saved_vc_fdt, size)) { > + if (write_file("/vc.dtb", saved_vc_fdt, size)) > pr_err("failed to save videocore fdt to a file\n"); > - return; > - } > > - ret = rpi_vc_fdt_bootargs(saved_vc_fdt); > - if (ret) { > - pr_err("failed to extract bootargs from videocore fdt: %d\n", > - ret); > - return; > + rpi_vc_fdt_parse(saved_vc_fdt); > +} > + > +static void rpi_set_kernel_name(void) { > + switch(cpu_architecture()) { > + case CPU_ARCH_ARMv6: > + globalvar_add_simple("vc.kernel", "kernel.img"); > + break; > + case CPU_ARCH_ARMv7: > + globalvar_add_simple("vc.kernel", "kernel7.img"); > + break; > + case CPU_ARCH_ARMv8: > + globalvar_add_simple("vc.kernel", "kernel8.img"); > + break; > } > } > > @@ -348,6 +465,7 @@ static int rpi_devices_probe(struct device_d *dev) > armlinux_set_architecture(MACH_TYPE_BCM2708); > rpi_env_init(); > rpi_vc_fdt(); > + rpi_set_kernel_name(); > > if (dcfg && dcfg->init) > dcfg->init(priv); > diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c > index ece80837b..c6e6a289f 100644 > --- a/drivers/watchdog/bcm2835_wdt.c > +++ b/drivers/watchdog/bcm2835_wdt.c > @@ -10,28 +10,7 @@ > #include > #include > > -#define PM_RSTC 0x1c > -#define PM_RSTS 0x20 > -#define PM_WDOG 0x24 > - > -#define PM_WDOG_RESET 0000000000 > -#define PM_PASSWORD 0x5a000000 > -#define PM_WDOG_TIME_SET 0x000fffff > -#define PM_RSTC_WRCFG_CLR 0xffffffcf > -#define PM_RSTC_WRCFG_SET 0x00000030 > -#define PM_RSTC_WRCFG_FULL_RESET 0x00000020 > -#define PM_RSTC_RESET 0x00000102 > - > -#define PM_RSTS_HADPOR_SET 0x00001000 > -#define PM_RSTS_HADSRH_SET 0x00000400 > -#define PM_RSTS_HADSRF_SET 0x00000200 > -#define PM_RSTS_HADSRQ_SET 0x00000100 > -#define PM_RSTS_HADWRH_SET 0x00000040 > -#define PM_RSTS_HADWRF_SET 0x00000020 > -#define PM_RSTS_HADWRQ_SET 0x00000010 > -#define PM_RSTS_HADDRH_SET 0x00000004 > -#define PM_RSTS_HADDRF_SET 0x00000002 > -#define PM_RSTS_HADDRQ_SET 0x00000001 > +#include > > #define SECS_TO_WDOG_TICKS(x) ((x) << 16) > > diff --git a/include/soc/bcm283x/wdt.h b/include/soc/bcm283x/wdt.h > new file mode 100644 > index 000000000..ce97b1eb5 > --- /dev/null > +++ b/include/soc/bcm283x/wdt.h > @@ -0,0 +1,40 @@ > +/* > + * Copyright (C) 2017 Pengutronix, Lucas Stach > + * > + * Based on code from Carlo Caione > + */ > + > +#ifndef __BCM2835_WDT_H > +#define __BCM2835_WDT_H > + > +#define PM_RSTC 0x1c > +#define PM_RSTS 0x20 > +#define PM_WDOG 0x24 > + > +#define PM_WDOG_RESET 0000000000 > +#define PM_PASSWORD 0x5a000000 > +#define PM_WDOG_TIME_SET 0x000fffff > +#define PM_RSTC_WRCFG_CLR 0xffffffcf > +#define PM_RSTC_WRCFG_SET 0x00000030 > +#define PM_RSTC_WRCFG_FULL_RESET 0x00000020 > +#define PM_RSTC_RESET 0x00000102 > + > +#define PM_RSTS_HADPOR_SET 0x00001000 > +#define PM_RSTS_HADSRH_SET 0x00000400 > +#define PM_RSTS_HADSRF_SET 0x00000200 > +#define PM_RSTS_HADSRQ_SET 0x00000100 > +#define PM_RSTS_HADWRH_SET 0x00000040 > +#define PM_RSTS_HADWRF_SET 0x00000020 > +#define PM_RSTS_HADWRQ_SET 0x00000010 > +#define PM_RSTS_HADDRH_SET 0x00000004 > +#define PM_RSTS_HADDRF_SET 0x00000002 > +#define PM_RSTS_HADDRQ_SET 0x00000001 > + > +#define PM_RSTS_HADDR_SET \ > + (PM_RSTS_HADDRQ_SET | PM_RSTS_HADDRF_SET | PM_RSTS_HADDRH_SET) > +#define PM_RSTS_HADWR_SET \ > + (PM_RSTS_HADWRQ_SET | PM_RSTS_HADWRF_SET | PM_RSTS_HADWRH_SET) > +#define PM_RSTS_HADSR_SET \ > + (PM_RSTS_HADSRQ_SET | PM_RSTS_HADSRF_SET | PM_RSTS_HADSRH_SET) > + > +#endif -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |