void platform_early_init(void)
{
ps7_init();
/* zynq manual says this is mandatory */
*REG32(SLCR_BASE + 0xa1c) = 0x020202;
/* early initialize the uart so we can printf */
uart_init_early();
/* initialize the interrupt controller */
arm_gic_init();
/* initialize the timer block */
arm_cortex_a9_timer_init(CPUPRIV_BASE, zynq_get_arm_timer_freq());
/* add the main memory arena */
#if !ZYNQ_CODE_IN_SDRAM && SDRAM_SIZE != 0
/* In the case of running from SRAM, and we are using SDRAM,
* there is a discontinuity between the end of SRAM (256K) and the start of SDRAM (1MB),
* so intentionally bump the boot-time allocator to start in the base of SDRAM.
*/
extern uintptr_t boot_alloc_start;
extern uintptr_t boot_alloc_end;
boot_alloc_start = KERNEL_BASE + MB;
boot_alloc_end = KERNEL_BASE + MB;
#endif
#if SDRAM_SIZE != 0
pmm_add_arena(&sdram_arena);
#endif
pmm_add_arena(&sram_arena);
}
void platform_early_init(void)
{
zynq_mio_init();
zynq_pll_init();
zynq_clk_init();
#if ZYNQ_SDRAM_INIT
zynq_ddr_init();
#endif
zynq_slcr_unlock();
/* Enable all level shifters */
SLCR_REG(LVL_SHFTR_EN) = 0xF;
/* FPGA SW reset (not documented, but mandatory) */
SLCR_REG(FPGA_RST_CTRL) = 0x0;
/* zynq manual says this is mandatory for cache init */
*REG32(SLCR_BASE + 0xa1c) = 0x020202;
zynq_slcr_lock();
/* early initialize the uart so we can printf */
uart_init_early();
/* initialize the interrupt controller */
arm_gic_init();
/* initialize the timer block */
arm_cortex_a9_timer_init(CPUPRIV_BASE, zynq_get_arm_timer_freq());
/* add the main memory arena */
#if !ZYNQ_CODE_IN_SDRAM && SDRAM_SIZE != 0
/* In the case of running from SRAM, and we are using SDRAM,
* there is a discontinuity between the end of SRAM (256K) and the start of SDRAM (1MB),
* so intentionally bump the boot-time allocator to start in the base of SDRAM.
*/
extern uintptr_t boot_alloc_start;
extern uintptr_t boot_alloc_end;
boot_alloc_start = KERNEL_BASE + MB;
boot_alloc_end = KERNEL_BASE + MB;
#endif
#if SDRAM_SIZE != 0
pmm_add_arena(&sdram_arena);
#endif
pmm_add_arena(&sram_arena);
}
void platform_early_init(void)
{
/* initialize the interrupt controller */
arm_gic_init();
arm_generic_timer_init(ARM_GENERIC_TIMER_PHYSICAL_INT, 0);
uart_init_early();
/* look for a flattened device tree just before the kernel */
const void *fdt = (void *)KERNEL_BASE;
int err = fdt_check_header(fdt);
if (err >= 0) {
/* walk the nodes, looking for 'memory' */
int depth = 0;
int offset = 0;
for (;;) {
offset = fdt_next_node(fdt, offset, &depth);
if (offset < 0)
break;
/* get the name */
const char *name = fdt_get_name(fdt, offset, NULL);
if (!name)
continue;
/* look for the 'memory' property */
if (strcmp(name, "memory") == 0) {
int lenp;
const void *prop_ptr = fdt_getprop(fdt, offset, "reg", &lenp);
if (prop_ptr && lenp == 0x10) {
/* we're looking at a memory descriptor */
//uint64_t base = fdt64_to_cpu(*(uint64_t *)prop_ptr);
uint64_t len = fdt64_to_cpu(*((const uint64_t *)prop_ptr + 1));
/* trim size on certain platforms */
#if ARCH_ARM
if (len > 1024*1024*1024U) {
len = 1024*1024*1024; /* only use the first 1GB on ARM32 */
printf("trimming memory to 1GB\n");
}
#endif
/* set the size in the pmm arena */
arena.size = len;
}
}
}
}
/* add the main memory arena */
pmm_add_arena(&arena);
/* reserve the first 64k of ram, which should be holding the fdt */
struct list_node list = LIST_INITIAL_VALUE(list);
pmm_alloc_range(MEMBASE, 0x10000 / PAGE_SIZE, &list);
}
void platform_early_init(void)
{
/* initialize the interrupt controller */
arm_gic_init();
/* initialize the timer block */
arm_cortex_a9_timer_init(CPUPRIV_BASE_PHYS, 100000000);
uart_init_early();
/* add the main memory arena */
pmm_add_arena(&arena);
}
void platform_early_init(void)
{
platform_init_uart();
/* update the heap end so we can take advantage of more ram */
platform_init_multiboot_info();
/* get the text console working */
platform_init_console();
/* initialize the interrupt controller */
platform_init_interrupts();
/* initialize the timer */
platform_init_timer();
#if WITH_KERNEL_VM
heap_arena_init();
pmm_add_arena(&heap_arena);
#endif
}
void platform_early_init(void)
{
#if 0
ps7_init();
#else
/* Unlock the registers and leave them that way */
zynq_slcr_unlock();
zynq_mio_init();
zynq_pll_init();
zynq_clk_init();
#if ZYNQ_SDRAM_INIT
zynq_ddr_init();
#endif
#endif
/* Enable all level shifters */
SLCR_REG(LVL_SHFTR_EN) = 0xF;
/* FPGA SW reset (not documented, but mandatory) */
SLCR_REG(FPGA_RST_CTRL) = 0x0;
/* zynq manual says this is mandatory for cache init */
*REG32(SLCR_BASE + 0xa1c) = 0x020202;
/* early initialize the uart so we can printf */
uart_init_early();
/* initialize the interrupt controller */
arm_gic_init();
zynq_gpio_init();
/* initialize the timer block */
arm_cortex_a9_timer_init(CPUPRIV_BASE, zynq_get_arm_timer_freq());
/* bump the 2nd cpu into our code space and remap the top SRAM block */
if (KERNEL_LOAD_OFFSET != 0) {
/* construct a trampoline to get the 2nd cpu up to the trap routine */
/* figure out the offset of the trampoline routine in physical space from address 0 */
extern void platform_reset(void);
addr_t tramp = (addr_t)&platform_reset;
tramp -= KERNEL_BASE;
tramp += MEMBASE;
/* stuff in a ldr pc, [nextaddrress], and a target address */
uint32_t *ptr = (uint32_t *)KERNEL_BASE;
ptr[0] = 0xe51ff004; // ldr pc, [pc, #-4]
ptr[1] = tramp;
arch_clean_invalidate_cache_range((addr_t)ptr, 8);
}
/* reset the 2nd cpu, letting it go through its reset vector (at 0x0 physical) */
SLCR_REG(A9_CPU_RST_CTRL) |= (1<<1); // reset cpu 1
spin(10);
SLCR_REG(A9_CPU_RST_CTRL) &= ~(1<<1); // unreset cpu 1
/* wait for the 2nd cpu to reset, go through the usual reset vector, and get trapped by our code */
/* see platform/zynq/reset.S */
extern volatile int __cpu_trapped;
uint count = 100000;
while (--count) {
arch_clean_invalidate_cache_range((addr_t)&__cpu_trapped, sizeof(__cpu_trapped));
if (__cpu_trapped != 0)
break;
}
if (count == 0) {
panic("ZYNQ: failed to trap 2nd cpu\n");
}
/* bounce the 4th sram region down to lower address */
SLCR_REG(OCM_CFG) &= ~0xf; /* all banks at low address */
/* add the main memory arena */
#if !ZYNQ_CODE_IN_SDRAM && SDRAM_SIZE != 0
/* In the case of running from SRAM, and we are using SDRAM,
* there is a discontinuity between the end of SRAM (256K) and the start of SDRAM (1MB),
* so intentionally bump the boot-time allocator to start in the base of SDRAM.
*/
extern uintptr_t boot_alloc_start;
extern uintptr_t boot_alloc_end;
boot_alloc_start = KERNEL_BASE + MB;
boot_alloc_end = KERNEL_BASE + MB;
#endif
#if SDRAM_SIZE != 0
pmm_add_arena(&sdram_arena);
#endif
pmm_add_arena(&sram_arena);
}