| /* Initializes CPU and basic hardware such as memory |
| * controllers, IRQ controller and system timer 0. |
| * |
| * (C) Copyright 2007, 2015 |
| * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <asm/asi.h> |
| #include <asm/leon.h> |
| #include <ambapp.h> |
| |
| #include <config.h> |
| |
| /* Default Plug&Play I/O area */ |
| #ifndef CONFIG_AMBAPP_IOAREA |
| #define CONFIG_AMBAPP_IOAREA AMBA_DEFAULT_IOAREA |
| #endif |
| |
| #define TIMER_BASE_CLK 1000000 |
| #define US_PER_TICK (1000000 / CONFIG_SYS_HZ) |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| /* reset CPU (jump to 0, without reset) */ |
| void start(void); |
| |
| /* find & initialize the memory controller */ |
| int init_memory_ctrl(void); |
| |
| ambapp_dev_irqmp *irqmp = NULL; |
| ambapp_dev_mctrl memctrl; |
| ambapp_dev_gptimer *gptimer = NULL; |
| unsigned int gptimer_irq = 0; |
| int leon3_snooping_avail = 0; |
| |
| struct { |
| gd_t gd_area; |
| bd_t bd; |
| } global_data; |
| |
| /* |
| * Breath some life into the CPU... |
| * |
| * Run from FLASH/PROM: |
| * - until memory controller is set up, only registers available |
| * - memory controller has already been setup up, stack can be used |
| * - no global variables available for writing |
| * - constants available |
| */ |
| void cpu_init_f(void) |
| { |
| |
| } |
| |
| /* Routine called from start.S, |
| * |
| * Run from FLASH/PROM: |
| * - memory controller has already been setup up, stack can be used |
| * - global variables available for read/writing |
| * - constants avaiable |
| */ |
| void cpu_init_f2(void) |
| { |
| /* Initialize the AMBA Plug & Play bus structure, the bus |
| * structure represents the AMBA bus that the CPU is located at. |
| */ |
| ambapp_bus_init(CONFIG_AMBAPP_IOAREA, CONFIG_SYS_CLK_FREQ, &ambapp_plb); |
| } |
| |
| /* |
| * initialize higher level parts of CPU like time base and timers |
| */ |
| int cpu_init_r(void) |
| { |
| ambapp_apbdev apbdev; |
| int index, cpu; |
| ambapp_dev_gptimer *timer = NULL; |
| unsigned int bus_freq; |
| |
| /* |
| * Find AMBA APB IRQMP Controller, |
| */ |
| if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, |
| GAISLER_IRQMP, 0, &apbdev) != 1) { |
| panic("%s: IRQ controller not found\n", __func__); |
| return -1; |
| } |
| irqmp = (ambapp_dev_irqmp *)apbdev.address; |
| |
| /* initialize the IRQMP */ |
| irqmp->ilevel = 0xf; /* all IRQ off */ |
| irqmp->iforce = 0; |
| irqmp->ipend = 0; |
| irqmp->iclear = 0xfffe; /* clear all old pending interrupts */ |
| for (cpu = 0; cpu < 16; cpu++) { |
| /* mask and clear force for all IRQs on CPU[N] */ |
| irqmp->cpu_mask[cpu] = 0; |
| irqmp->cpu_force[cpu] = 0; |
| } |
| |
| /* timer */ |
| index = 0; |
| while (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_GPTIMER, |
| index, &apbdev) == 1) { |
| timer = (ambapp_dev_gptimer *)apbdev.address; |
| if (gptimer == NULL) { |
| gptimer = timer; |
| gptimer_irq = apbdev.irq; |
| } |
| |
| /* Different buses may have different frequency, the |
| * frequency of the bus tell in which frequency the timer |
| * prescaler operates. |
| */ |
| bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index); |
| |
| /* initialize prescaler common to all timers to 1MHz */ |
| timer->scalar = timer->scalar_reload = |
| (((bus_freq / 1000) + 500) / 1000) - 1; |
| |
| index++; |
| } |
| if (!gptimer) { |
| printf("%s: gptimer not found!\n", __func__); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Uses Timer 0 to get accurate |
| * pauses. Max 2 raised to 32 ticks |
| * |
| */ |
| void cpu_wait_ticks(unsigned long ticks) |
| { |
| unsigned long start = get_timer(0); |
| while (get_timer(start) < ticks) ; |
| } |
| |
| /* initiate and setup timer0 interrupt to configured HZ. Base clock is 1MHz. |
| * Return irq number for timer int or a negative number for |
| * dealing with self |
| */ |
| int timer_interrupt_init_cpu(void) |
| { |
| /* SYS_HZ ticks per second */ |
| gptimer->e[0].val = 0; |
| gptimer->e[0].rld = (TIMER_BASE_CLK / CONFIG_SYS_HZ) - 1; |
| gptimer->e[0].ctrl = |
| (LEON3_GPTIMER_EN | |
| LEON3_GPTIMER_RL | LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN); |
| |
| return gptimer_irq; |
| } |
| |
| ulong get_tbclk(void) |
| { |
| return TIMER_BASE_CLK; |
| } |
| |
| /* |
| * This function is intended for SHORT delays only. |
| */ |
| unsigned long cpu_usec2ticks(unsigned long usec) |
| { |
| if (usec < US_PER_TICK) |
| return 1; |
| return usec / US_PER_TICK; |
| } |
| |
| unsigned long cpu_ticks2usec(unsigned long ticks) |
| { |
| return ticks * US_PER_TICK; |
| } |