/* * (C) Copyright 2007 * Sascha Hauer, Pengutronix * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <asm/arch/mx31-regs.h> static u32 mx31_decode_pll(u32 reg, u32 infreq) { u32 mfi = (reg >> 10) & 0xf; u32 mfn = reg & 0x3f; u32 mfd = (reg >> 16) & 0x3f; u32 pd = (reg >> 26) & 0xf; mfi = mfi <= 5 ? 5 : mfi; mfd += 1; pd += 1; return ((2 * (infreq >> 10) * (mfi * mfd + mfn)) / (mfd * pd)) << 10; } static u32 mx31_get_mpl_dpdgck_clk(void) { u32 infreq; if ((__REG(CCM_CCMR) & CCMR_PRCS_MASK) == CCMR_FPM) infreq = CONFIG_MX31_CLK32 * 1024; else infreq = CONFIG_MX31_HCLK_FREQ; return mx31_decode_pll(__REG(CCM_MPCTL), infreq); } static u32 mx31_get_mcu_main_clk(void) { /* For now we assume mpl_dpdgck_clk == mcu_main_clk * which should be correct for most boards */ return mx31_get_mpl_dpdgck_clk(); } u32 mx31_get_ipg_clk(void) { u32 freq = mx31_get_mcu_main_clk(); u32 pdr0 = __REG(CCM_PDR0); freq /= ((pdr0 >> 3) & 0x7) + 1; freq /= ((pdr0 >> 6) & 0x3) + 1; return freq; } void mx31_dump_clocks(void) { u32 cpufreq = mx31_get_mcu_main_clk(); printf("mx31 cpu clock: %dMHz\n",cpufreq / 1000000); printf("ipg clock : %dHz\n", mx31_get_ipg_clk()); } void mx31_gpio_mux(unsigned long mode) { unsigned long reg, shift, tmp; reg = IOMUXC_BASE + (mode & 0x1fc); shift = (~mode & 0x3) * 8; tmp = __REG(reg); tmp &= ~(0xff << shift); tmp |= ((mode >> IOMUX_MODE_POS) & 0xff) << shift; __REG(reg) = tmp; } #if defined(CONFIG_DISPLAY_CPUINFO) int print_cpuinfo (void) { printf("CPU: Freescale i.MX31 at %d MHz\n", mx31_get_mcu_main_clk() / 1000000); return 0; } #endif