Index: kernel/genarch/src/drivers/bcm2835/irc.c =================================================================== --- kernel/genarch/src/drivers/bcm2835/irc.c (revision e77d408363d8fa63d5e741b4ba05c3cb8fefdeda) +++ kernel/genarch/src/drivers/bcm2835/irc.c (revision e77d408363d8fa63d5e741b4ba05c3cb8fefdeda) @@ -0,0 +1,141 @@ +/* + * Copyright (c) 2019 Jiri Svoboda + * Copyright (c) 2012 Jan Vesely + * Copyright (c) 2013 Beniamino Galvani + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - 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. + * - The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ +/** @addtogroup kernel_genarch + * @{ + */ +/** + * @file + * @brief Broadcom BCM2835 on-chip interrupt controller driver. + */ + +#include +#include +#include + +unsigned shortcut_inums[] = { 7, 9, 10, 18, 19, 53, 54, 55, 56, 57, 62 }; + +static void bcm2835_irc_dump(bcm2835_irc_t *regs) +{ +#define DUMP_REG(name) \ + printf("%s : %08x\n", #name, regs->name); + + DUMP_REG(irq_basic_pending); + DUMP_REG(irq_pending1); + DUMP_REG(irq_pending2); + DUMP_REG(fiq_control); + + for (int i = 0; i < 3; ++i) { + DUMP_REG(irq_enable[i]); + DUMP_REG(irq_disable[i]); + } +#undef DUMP_REG +} + +void bcm2835_irc_init(bcm2835_irc_t *regs) +{ + /* Disable all interrupts */ + regs->irq_disable[BANK_GPU0] = 0xffffffff; + regs->irq_disable[BANK_GPU1] = 0xffffffff; + regs->irq_disable[BANK_ARM] = 0xffffffff; + + /* Disable FIQ generation */ + regs->fiq_control = 0; +} + +static int ffs(unsigned int x) +{ + int ret; + + asm volatile ( + "clz r0, %[x]\n" + "rsb %[ret], r0, #32\n" + : [ret] "=r" (ret) + : [x] "r" (x) + : "r0" + ); + + return ret; +} + +unsigned bcm2835_irc_inum_get(bcm2835_irc_t *regs) +{ + uint32_t pending; + int inum = -1; + + pending = regs->irq_basic_pending; + + /* + * The basic pending register shows interrupts pending from ARM + * peripherals and it also contains, in order to speed up processing, + * additional information about pending GPU interrupts: + * + * - bits 0-7 are associated to ARM peripherals + * - bit 8 is 1 when at least one bit is set in pending register 1 + * - bit 9 is 1 when at least one bit is set in pending register 2 + * - bits 10-20 indicate pending status of selected GPU peripherals + * + * Reference: BCM2835 ARM Peripherals, p.113 + */ + + if (pending & IRQ_PEND_ARM_M) { + inum = MAKE_IRQ(BANK_ARM, ffs(pending & IRQ_PEND_ARM_M) - 1); + } else if (pending & IRQ_PEND_SHORT_M) { + int pos = (pending & IRQ_PEND_SHORT_M) >> IRQ_PEND_SHORT_S; + inum = shortcut_inums[ffs(pos) - 1]; + } else if (pending & IRQ_PEND_GPU0_M) { + inum = MAKE_IRQ(BANK_GPU0, ffs(regs->irq_pending1) - 1); + } else if (pending & IRQ_PEND_GPU1_M) { + inum = MAKE_IRQ(BANK_GPU1, ffs(regs->irq_pending2) - 1); + } + + if (inum < 0) { + printf("Spurious interrupt!\n"); + bcm2835_irc_dump(regs); + inum = 0; + } + + return inum; +} + +void bcm2835_irc_enable(bcm2835_irc_t *regs, unsigned inum) +{ + assert(inum < BCM2835_IRQ_COUNT); + regs->irq_enable[IRQ_TO_BANK(inum)] |= (1 << IRQ_TO_NUM(inum)); +} + +void bcm2835_irc_disable(bcm2835_irc_t *regs, unsigned inum) +{ + assert(inum < BCM2835_IRQ_COUNT); + regs->irq_disable[IRQ_TO_BANK(inum)] |= (1 << IRQ_TO_NUM(inum)); +} + +/** + * @} + */ Index: kernel/genarch/src/drivers/bcm2835/timer.c =================================================================== --- kernel/genarch/src/drivers/bcm2835/timer.c (revision e77d408363d8fa63d5e741b4ba05c3cb8fefdeda) +++ kernel/genarch/src/drivers/bcm2835/timer.c (revision e77d408363d8fa63d5e741b4ba05c3cb8fefdeda) @@ -0,0 +1,61 @@ +/* + * Copyright (c) 2019 Jiri Svoboda + * Copyright (c) 2013 Beniamino Galvani + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - 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. + * - The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ +/** @addtogroup kernel_genarch + * @{ + */ +/** + * @file + * @brief Broadcom BCM2835 system timer driver. + */ + +#include +#include +#include