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/*
* Minimal bootblock for Cubieboard
* It sets up CPU clock, and enables the bootblock console.
*
* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
* Subject to the GNU GPL v2, or (at your option) any later version.
*/
#include <arch/io.h>
#include <uart.h>
#include <console/console.h>
#include <cpu/allwinner/a10/gpio.h>
#include <cpu/allwinner/a10/clock.h>
#define CPU_AHB_APB0_DEFAULT \
CPU_CLK_SRC_OSC24M \
| APB0_DIV_1 \
| AHB_DIV_1 \
| AXI_DIV_1
#define GPB22_UART0_TX_FUNC 2
#define GPB23_UART0_RX_FUNC 2
static void cubieboard_set_sys_clock(void)
{
u32 reg32;
struct a10_ccm *ccm = (void *)A1X_CCM_BASE;
/* Switch CPU clock to main oscillator */
write32(CPU_AHB_APB0_DEFAULT, &ccm->cpu_ahb_apb0_cfg);
/* Configure the PLL1. The value is the same one used by u-boot */
write32(0xa1005000, &ccm->pll1_cfg);
/* FIXME: Delay to wait for PLL to lock */
u32 wait = 1000;
while (--wait);
/* Switch CPU to PLL clock */
reg32 = read32(&ccm->cpu_ahb_apb0_cfg);
reg32 &= ~CPU_CLK_SRC_MASK;
reg32 |= CPU_CLK_SRC_PLL1;
write32(reg32, &ccm->cpu_ahb_apb0_cfg);
}
static void cubieboard_setup_clocks(void)
{
struct a10_ccm *ccm = (void *)A1X_CCM_BASE;
cubieboard_set_sys_clock();
/* Configure the clock source for APB1. This drives our UART */
write32(APB1_CLK_SRC_OSC24M | APB1_RAT_N(0) | APB1_RAT_M(0),
&ccm->apb1_clk_div_cfg);
}
static void cubieboard_setup_gpios(void)
{
/* Mux UART pins */
gpio_set_func(GPB, 22, GPB22_UART0_TX_FUNC);
gpio_set_func(GPB, 23, GPB23_UART0_RX_FUNC);
}
static void cubieboard_enable_uart(void)
{
u32 reg32;
struct a10_ccm *ccm = (void *)A1X_CCM_BASE;
/* Enable clock to UART0 */
reg32 = read32(&ccm->apb1_gate);
reg32 |= APB1_GATE_UART(0);
write32(reg32, &ccm->apb1_gate);
}
void bootblock_mainboard_init(void);
void bootblock_mainboard_init(void)
{
cubieboard_setup_clocks();
cubieboard_setup_gpios();
cubieboard_enable_uart();
}
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