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[Minios-devel] [UNIKRAFT RFC PATCH 2/5] plat/common: Implement PL031 RTC library for Arm

To: <minios-devel@xxxxxxxxxxxxxxxxxxxx>, <simon.kuenzer@xxxxxxxxx>

From: Jianyong Wu <jianyong.wu@xxxxxxx>

Date: Fri, 21 Sep 2018 08:07:04 +0000

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From: Jianyong Wu <Jianyong.Wu@xxxxxxx> Change-Id: I93bb369582926fbdaf2a73a4eb8e86e578db19a3 Signed-off-by: Wei Chen <wei.chen@xxxxxxx> Signed-off-by: Jianyong Wu <Jianyong.Wu@xxxxxxx> --- plat/common/arm/rtc.c | 167 ++++++++++++++++++++++++++++++++++++++++++ plat/common/include/arm/rtc.h | 43 +++++++++++ plat/kvm/Makefile.uk | 1 + plat/kvm/arm/setup.c | 4 + 4 files changed, 215 insertions(+) create mode 100644 plat/common/arm/rtc.c create mode 100644 plat/common/include/arm/rtc.h diff --git a/plat/common/arm/rtc.c b/plat/common/arm/rtc.c new file mode 100644 index 0000000..c1cdc8d --- /dev/null +++ b/plat/common/arm/rtc.c @@ -0,0 +1,167 @@ +/* SPDX-License-Identifier: BSD-3-Clause */ +/* + * Authors: Wei Chen <Wei.Chen@xxxxxxx> + * Jianyong Wu <Jianyong.Wu@xxxxxxx> + * + * Copyright (c) 2018, Arm Ltd. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the copyright holder nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY. + */ +#include <string.h> +#include <libfdt.h> +#include <uk/assert.h> +#include <uk/essentials.h> +#include <uk/print.h> +#include <arm/cpu.h> + +static void *rtc_base_addr; +uint32_t rtc_boot_seconds; + +/* Define offset of RTC registers */ +#define RTC_REG_DR 0 +#define RTC_REG_MR 0x4 +#define RTC_REG_LR 0x8 +#define RTC_REG_CR 0xc +#define RTC_REG_IMSC 0x10 +#define RTC_REG_RIS 0x14 +#define RTC_REG_MIS 0x18 +#define RTC_REG_ICR 0x1c + +#define RTC_REG(r) (rtc_base_addr + (r)) + +static char *rtc_device_list[] = { + "arm,pl031", + "arm,primecell", +}; + +uint32_t rtc_read(void) +{ + return ioreg_read32(RTC_REG(RTC_REG_DR)); +} + +/* + * set rtc match register comparing with counter + * value to generat a interrupt + */ +void rtc_set_match(uint32_t alam) +{ + ioreg_write32(RTC_REG(RTC_REG_MR), alam); +} + +void rtc_update(uint32_t val) +{ + ioreg_write32(RTC_REG(RTC_REG_LR), val); +} + +void rtc_enable(void) +{ + ioreg_write32(RTC_REG(RTC_REG_CR), 1); +} + +/* return rtc status, 1 denotes enable and 0 denotes disable */ +uint32_t rtc_get_status(void) +{ + uint32_t val; + + val = ioreg_read32(RTC_REG(RTC_REG_CR)); + val &= 0x1; + return val; +} + +/* mask alam */ +void rtc_mask_intr(void) +{ + ioreg_write32(RTC_REG(RTC_REG_IMSC), 1); +} + +/* clear alam mask */ +void rtc_unmask_intr(void) +{ + ioreg_write32(RTC_REG(RTC_REG_IMSC), 0); +} + +/* return the raw state of rtc interrupt before masking*/ +uint32_t rtc_get_intr_raw_state(void) +{ + return ioreg_read32(RTC_REG(RTC_REG_RIS)); +} + +/* return interrupt state after interrupt masking */ +uint32_t rtc_get_intr_state(void) +{ + return ioreg_read32(RTC_REG(RTC_REG_MIS)); +} + +void rtc_clear_intr(void) +{ + ioreg_write32(RTC_REG(RTC_REG_ICR), 1); +} + +int _dtb_init_rtc(void *dtb) +{ + uint32_t idx; + int fdt_rtc, naddr, nsize, prop_len, prop_min_len; + const uint64_t *regs; + + uk_printd(DLVL_INFO, "Probing RTC...\n"); + for (idx = 0; + idx < sizeof(rtc_device_list) / sizeof(rtc_device_list[0]); + idx++) { + fdt_rtc = fdt_node_offset_by_compatible(dtb, -1, + rtc_device_list[idx]); + if (fdt_rtc >= 0) + break; + } + + if (fdt_rtc < 0) + UK_CRASH("No valid RTC device find\n"); + + naddr = fdt_address_cells(dtb, fdt_rtc); + if (naddr < 0 || naddr >= FDT_MAX_NCELLS) + UK_CRASH("Could not find proper address cells!\n"); + + nsize = fdt_size_cells(dtb, fdt_rtc); + if (nsize < 0 || nsize >= FDT_MAX_NCELLS) + UK_CRASH("Could not find proper size cells!\n"); + + regs = fdt_getprop(dtb, fdt_rtc, "reg", &prop_len); + + /* + * The property must contain at least the start address and size. + */ + prop_min_len = (int)sizeof(fdt32_t) * (naddr + nsize); + if (regs == NULL || prop_len < prop_min_len) + UK_CRASH("Bad 'reg' property: %p %d\n", regs, prop_len); + + rtc_base_addr = (void *)fdt64_to_cpu(regs[0]); + + /* Record the boot seconds */ + rtc_boot_seconds = rtc_read(); + + uk_printd(DLVL_INFO, "Found RTC on: %p\n", rtc_base_addr); +} diff --git a/plat/common/include/arm/rtc.h b/plat/common/include/arm/rtc.h new file mode 100644 index 0000000..d8bab7f --- /dev/null +++ b/plat/common/include/arm/rtc.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: BSD-3-Clause */ +/* + * Authors: Wei Chen <Wei.Chen@xxxxxxx> + * Jianyong Wu <Jianyong.Wu@xxxxxxx> + * + * Copyright (c) 2018, Arm Ltd. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the copyright holder nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY. + */ + +#ifndef __PLAT_CMN_ARM_RTC_H__ +#define __PLAT_CMN_ARM_RTC_H__ + +extern uint32_t rtc_boot_seconds; + +int _dtb_init_rtc(void *dtb); + +#endif //__PLAT_CMN_ARM_GICV2_H__ diff --git a/plat/kvm/Makefile.uk b/plat/kvm/Makefile.uk index 9a9fab4..c7e133b 100644 --- a/plat/kvm/Makefile.uk +++ b/plat/kvm/Makefile.uk @@ -59,6 +59,7 @@ LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/cpu_native.c LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/cache64.S|common LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/psci_arm64.S|common LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/time.c|common +LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/rtc.c|common LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/traps.c|common LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(UK_PLAT_COMMON_BASE)/arm/gic-v2.c|common LIBKVMPLAT_SRCS-$(CONFIG_ARCH_ARM_64) += $(LIBKVMPLAT_BASE)/arm/entry64.S diff --git a/plat/kvm/arm/setup.c b/plat/kvm/arm/setup.c index 9f03498..12524ae 100644 --- a/plat/kvm/arm/setup.c +++ b/plat/kvm/arm/setup.c @@ -25,6 +25,7 @@ #include <kvm/console.h> #include <kvm-arm/mm.h> #include <arm/cpu.h> +#include <arm/rtc.h> #include <arm/gic-v2.h> void *_libkvmplat_pagetable; @@ -190,6 +191,9 @@ static void _libkvmplat_entry2(void *arg __attribute__((unused))) /* Initialize GIC interrupt controller */ _dtb_init_gic(_libkvmplat_dtb); + /* Initialize RTC */ + _dtb_init_rtc(_libkvmplat_dtb); + ukplat_entry_argp(NULL, (char *)cmdline, strlen(cmdline)); } -- 2.7.4 IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. 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