forked from Imagelibrary/rtems
1480c3f5e8
This breaks AArch32-specific portions of the ARM GPT driver into their own file so that the generic code can be moved for reuse by other architectures.
108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
/*
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* Copyright (c) 2017 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <info@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <bsp.h>
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#include <bsp/bootcard.h>
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#include <bsp/fatal.h>
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#include <bsp/fdt.h>
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#include <bsp/irq-generic.h>
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#include <bsp/linker-symbols.h>
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#include <dev/clock/arm-generic-timer.h>
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#include <libfdt.h>
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#define MAGIC_IRQ_OFFSET 32
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void *imx_get_reg_of_node(const void *fdt, int node)
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{
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int len;
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const uint32_t *val;
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val = fdt_getprop(fdt, node, "reg", &len);
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if (val == NULL || len < 4) {
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return NULL;
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}
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return (void *) fdt32_to_cpu(val[0]);
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}
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rtems_vector_number imx_get_irq_of_node(
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const void *fdt,
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int node,
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size_t index
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)
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{
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int len;
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const uint32_t *val;
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val = fdt_getprop(fdt, node, "interrupts", &len);
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if (val == NULL || len < (int) ((index + 1) * 12)) {
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return BSP_INTERRUPT_VECTOR_INVALID;
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}
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return fdt32_to_cpu(val[index * 3 + 1]) + MAGIC_IRQ_OFFSET;
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}
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uint32_t bsp_fdt_map_intr(const uint32_t *intr, size_t icells)
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{
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return intr[1] + MAGIC_IRQ_OFFSET;
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}
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void arm_generic_timer_get_config(
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uint32_t *frequency,
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uint32_t *irq
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)
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{
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const void *fdt;
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int node;
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int len;
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const uint32_t *val;
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fdt = bsp_fdt_get();
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node = fdt_path_offset(fdt, "/timer");
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val = fdt_getprop(fdt, node, "clock-frequency", &len);
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if (val != NULL && len >= 4) {
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*frequency = fdt32_to_cpu(val[0]);
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} else {
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bsp_fatal(IMX_FATAL_GENERIC_TIMER_FREQUENCY);
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}
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/* FIXME: Figure out how Linux gets a proper IRQ number */
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*irq = imx_get_irq_of_node(fdt, node, 0) - 16;
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}
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uintptr_t imx_gic_dist_base;
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static void imx_find_gic(const void *fdt)
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{
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int node;
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node = fdt_path_offset(fdt, "/interrupt-controller");
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if (node < 0) {
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node = fdt_path_offset(fdt, "/soc/interrupt-controller");
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}
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imx_gic_dist_base = (uintptr_t) imx_get_reg_of_node(fdt, node);
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}
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void bsp_start(void)
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{
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imx_find_gic(bsp_fdt_get());
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bsp_interrupt_initialize();
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rtems_cache_coherent_add_area(
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bsp_section_nocacheheap_begin,
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(uintptr_t) bsp_section_nocacheheap_size
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);
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}
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