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drasko |
/*
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* Beagle Board platform-specific initialisation and setup
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#include <l4/generic/platform.h>
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#include <l4/generic/space.h>
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#include <l4/generic/irq.h>
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#include <l4/generic/bootmem.h>
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#include INC_ARCH(linker.h)
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#include INC_SUBARCH(mm.h)
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#include INC_GLUE(mapping.h)
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#include INC_SUBARCH(mmu_ops.h)
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#include INC_GLUE(memory.h)
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#include INC_PLAT(platform.h)
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#include INC_PLAT(uart.h)
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#include INC_PLAT(timer.h)
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#include INC_PLAT(irq.h)
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#include INC_ARCH(asm.h)
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#include INC_PLAT(cm.h)
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/*
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* The devices that are used by the kernel are mapped
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* independent of these capabilities, but these provide a
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* concise description of what is used by the kernel.
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*/
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int platform_setup_device_caps(struct kernel_resources *kres)
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{
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struct capability *timer[1];
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/* Setup timer1 capability as free */
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timer[0] = alloc_bootmem(sizeof(*timer[0]), 0);
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timer[0]->start = __pfn(PLATFORM_TIMER1_BASE);
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timer[0]->end = timer[0]->start + 1;
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timer[0]->size = timer[0]->end - timer[0]->start;
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cap_set_devtype(timer[0], CAP_DEVTYPE_TIMER);
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cap_set_devnum(timer[0], 1);
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link_init(&timer[0]->list);
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cap_list_insert(timer[0], &kres->devmem_free);
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return 0;
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}
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/*
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* Use UART2 for kernel as well as user tasks,
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* so map it to kernel and user space, this only
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* is provided by beagle board
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*/
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void init_platform_console(void)
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{
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add_boot_mapping(PLATFORM_UART2_BASE, PLATFORM_CONSOLE_VBASE,
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PAGE_SIZE, MAP_IO_DEFAULT);
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add_boot_mapping(PLATFORM_PERCM_BASE, PLATFORM_PERCM_VBASE,
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PAGE_SIZE, MAP_IO_DEFAULT);
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/*
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* Map same UART IO area to userspace so that primitive uart-based
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* userspace printf can work. Note, this raw mapping is to be
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* removed in the future, when file-based io is implemented.
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*/
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add_boot_mapping(PLATFORM_UART2_BASE, USERSPACE_CONSOLE_VBASE,
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PAGE_SIZE, MAP_USR_IO);
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/* use 32KHz clock signal */
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omap_cm_clk_select(PLATFORM_PERCM_VBASE, 11,
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OMAP_TIMER_CLKSRC_SYS_CLK);
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/* Enable Interface and Functional clock */
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omap_cm_enable_iclk(PLATFORM_PERCM_VBASE, 11);
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omap_cm_enable_fclk(PLATFORM_PERCM_VBASE, 11);
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uart_init(PLATFORM_CONSOLE_VBASE);
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}
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void platform_timer_start(void)
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{
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/* Enable irq line for TIMER0 */
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irq_enable(IRQ_TIMER0);
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/* Enable timer */
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timer_start(PLATFORM_TIMER0_VBASE);
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}
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/*
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* We are using GPTIMER1 only, so we map GPTIMER1 base,
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* incase any other timer is needed we need to map it
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* to userspace or kernel space as needed
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*/
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void init_platform_timer(void)
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{
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add_boot_mapping(PLATFORM_TIMER0_BASE, PLATFORM_TIMER0_VBASE,
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PAGE_SIZE, MAP_IO_DEFAULT);
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add_boot_mapping(PLATFORM_WKUP_CM_BASE, PLATFORM_WKUP_CM_VBASE,
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PAGE_SIZE, MAP_IO_DEFAULT);
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#if 0
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/* use 32KHz clock signal */
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omap_cm_clk_select(PLATFORM_WKUP_CM_VBASE, 0,
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OMAP_TIMER_CLKSRC_32KHZ_CLK);
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#else
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/*
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* Assumption: Beagle board RevC manual says,
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* it has 26MHz oscillator present, so we are
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* assuming this oscillator is our system clock
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*/
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omap_cm_clk_select(PLATFORM_WKUP_CM_VBASE, 0,
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OMAP_TIMER_CLKSRC_SYS_CLK);
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#endif
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/* Enable Interface and Functional clock */
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omap_cm_enable_iclk(PLATFORM_WKUP_CM_VBASE, 0);
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omap_cm_enable_fclk(PLATFORM_WKUP_CM_VBASE, 0);
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timer_init(PLATFORM_TIMER0_VBASE);
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}
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void init_platform_irq_controller()
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{
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add_boot_mapping(PLATFORM_INTC_BASE, PLATFORM_INTC_VBASE,
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PAGE_SIZE, MAP_IO_DEFAULT);
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irq_controllers_init();
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}
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void init_platform_devices()
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{
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/* Add userspace devices here as you develop their irq handlers */
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add_boot_mapping(PLATFORM_TIMER1_BASE, PLATFORM_TIMER1_VBASE,
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PAGE_SIZE, MAP_IO_DEFAULT);
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}
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void platform_init(void)
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{
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init_platform_console();
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init_platform_timer();
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init_platform_irq_controller();
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init_platform_devices();
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}
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