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https://github.com/brain-hackers/u-boot-brain
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![Francois Retief](/assets/img/avatar_default.png)
Remove the board.c and time.c files and all associated non-generic board initialization code. Signed-off-by: Francois Retief <fgretief@spaceteq.co.za>
176 lines
4.2 KiB
C
176 lines
4.2 KiB
C
/* Initializes CPU and basic hardware such as memory
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* controllers, IRQ controller and system timer 0.
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*
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* (C) Copyright 2007, 2015
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* Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/asi.h>
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#include <asm/leon.h>
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#include <asm/io.h>
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#include <ambapp.h>
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#include <grlib/irqmp.h>
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#include <grlib/gptimer.h>
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#include <debug_uart.h>
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#include <config.h>
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/* Default Plug&Play I/O area */
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#ifndef CONFIG_AMBAPP_IOAREA
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#define CONFIG_AMBAPP_IOAREA AMBA_DEFAULT_IOAREA
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#endif
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/* Select which TIMER that will become the time base */
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#ifndef CONFIG_SYS_GRLIB_GPTIMER_INDEX
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#define CONFIG_SYS_GRLIB_GPTIMER_INDEX 0
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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ambapp_dev_irqmp *irqmp = NULL;
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/*
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* Breath some life into the CPU...
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*
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* Run from FLASH/PROM:
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* - until memory controller is set up, only registers available
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* - memory controller has already been setup up, stack can be used
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* - no global variables available for writing
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* - constants available
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*/
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void cpu_init_f(void)
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{
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#ifdef CONFIG_DEBUG_UART
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debug_uart_init();
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#endif
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}
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/* If cache snooping is available in hardware the result will be set
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* to 0x800000, otherwise 0.
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*/
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static unsigned int snoop_detect(void)
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{
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unsigned int result;
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asm("lda [%%g0] 2, %0" : "=r"(result));
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return result & 0x00800000;
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}
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int arch_cpu_init(void)
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{
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ambapp_apbdev apbdev;
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int index;
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gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
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gd->bus_clk = CONFIG_SYS_CLK_FREQ;
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gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
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gd->arch.snooping_available = snoop_detect();
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/* Initialize the AMBA Plug & Play bus structure, the bus
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* structure represents the AMBA bus that the CPU is located at.
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*/
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ambapp_bus_init(CONFIG_AMBAPP_IOAREA, CONFIG_SYS_CLK_FREQ, &ambapp_plb);
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/* Initialize/clear all the timers in the system.
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*/
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for (index = 0; ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER,
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GAISLER_GPTIMER, index, &apbdev) == 1; index++) {
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ambapp_dev_gptimer *timer;
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unsigned int bus_freq;
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int i, ntimers;
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timer = (ambapp_dev_gptimer *)apbdev.address;
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/* Different buses may have different frequency, the
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* frequency of the bus tell in which frequency the timer
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* prescaler operates.
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*/
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bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
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/* Initialize prescaler common to all timers to 1MHz */
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timer->scalar = timer->scalar_reload =
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(((bus_freq / 1000) + 500) / 1000) - 1;
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/* Clear all timers */
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ntimers = timer->config & 0x7;
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for (i = 0; i < ntimers; i++) {
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timer->e[i].ctrl = GPTIMER_CTRL_IP;
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timer->e[i].rld = 0;
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timer->e[i].ctrl = GPTIMER_CTRL_LD;
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}
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}
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return 0;
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}
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/*
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* initialize higher level parts of CPU like time base and timers
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*/
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int cpu_init_r(void)
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{
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ambapp_apbdev apbdev;
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int cpu;
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/*
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* Find AMBA APB IRQMP Controller,
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*/
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if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER,
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GAISLER_IRQMP, 0, &apbdev) != 1) {
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panic("%s: IRQ controller not found\n", __func__);
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return -1;
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}
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irqmp = (ambapp_dev_irqmp *)apbdev.address;
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/* initialize the IRQMP */
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irqmp->ilevel = 0xf; /* all IRQ off */
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irqmp->iforce = 0;
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irqmp->ipend = 0;
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irqmp->iclear = 0xfffe; /* clear all old pending interrupts */
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for (cpu = 0; cpu < 16; cpu++) {
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/* mask and clear force for all IRQs on CPU[N] */
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irqmp->cpu_mask[cpu] = 0;
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irqmp->cpu_force[cpu] = 0;
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}
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return 0;
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}
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;
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int timer_init(void)
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{
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ambapp_dev_gptimer_element *tmr;
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ambapp_dev_gptimer *gptimer;
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ambapp_apbdev apbdev;
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unsigned bus_freq;
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if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_GPTIMER,
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CONFIG_SYS_GRLIB_GPTIMER_INDEX, &apbdev) != 1) {
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panic("%s: gptimer not found!\n", __func__);
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return -1;
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}
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gptimer = (ambapp_dev_gptimer *) apbdev.address;
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/* Different buses may have different frequency, the
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* frequency of the bus tell in which frequency the timer
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* prescaler operates.
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*/
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bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
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/* initialize prescaler common to all timers to 1MHz */
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gptimer->scalar = gptimer->scalar_reload =
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(((bus_freq / 1000) + 500) / 1000) - 1;
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tmr = (ambapp_dev_gptimer_element *)&gptimer->e[0];
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tmr->val = 0;
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tmr->rld = ~0;
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tmr->ctrl = GPTIMER_CTRL_EN | GPTIMER_CTRL_RS | GPTIMER_CTRL_LD;
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CONFIG_SYS_TIMER_COUNTER = (void *)&tmr->val;
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return 0;
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}
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