2 * Copyright (C) 2004 Texas Instruments.
3 * Copyright (C) 2009 David Brownell
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <asm/arch/hardware.h>
27 /* offsets from PLL controller base */
28 #define PLLC_PLLCTL 0x100
29 #define PLLC_PLLM 0x110
30 #define PLLC_PREDIV 0x114
31 #define PLLC_PLLDIV1 0x118
32 #define PLLC_PLLDIV2 0x11c
33 #define PLLC_PLLDIV3 0x120
34 #define PLLC_POSTDIV 0x128
35 #define PLLC_BPDIV 0x12c
36 #define PLLC_PLLDIV4 0x160
37 #define PLLC_PLLDIV5 0x164
38 #define PLLC_PLLDIV6 0x168
39 #define PLLC_PLLDIV8 0x170
40 #define PLLC_PLLDIV9 0x174
42 #define BIT(x) (1 << (x))
44 /* SOC-specific pll info */
45 #ifdef CONFIG_SOC_DM355
46 #define ARM_PLLDIV PLLC_PLLDIV1
47 #define DDR_PLLDIV PLLC_PLLDIV1
50 #ifdef CONFIG_SOC_DM644X
51 #define ARM_PLLDIV PLLC_PLLDIV2
52 #define DSP_PLLDIV PLLC_PLLDIV1
53 #define DDR_PLLDIV PLLC_PLLDIV2
56 #ifdef CONFIG_SOC_DM6447
57 #define ARM_PLLDIV PLLC_PLLDIV2
58 #define DSP_PLLDIV PLLC_PLLDIV1
59 #define DDR_PLLDIV PLLC_PLLDIV1
63 #ifdef CONFIG_DISPLAY_CPUINFO
65 static unsigned pll_div(volatile void *pllbase, unsigned offset)
69 div = REG(pllbase + offset);
70 return (div & BIT(15)) ? (1 + (div & 0x1f)) : 1;
73 static inline unsigned pll_prediv(volatile void *pllbase)
75 #ifdef CONFIG_SOC_DM355
76 /* this register read seems to fail on pll0 */
77 if (pllbase == (volatile void *)DAVINCI_PLL_CNTRL0_BASE)
80 return pll_div(pllbase, PLLC_PREDIV);
85 static inline unsigned pll_postdiv(volatile void *pllbase)
87 #ifdef CONFIG_SOC_DM355
88 return pll_div(pllbase, PLLC_POSTDIV);
89 #elif defined(CONFIG_SOC_DM6446)
90 if (pllbase == (volatile void *)DAVINCI_PLL_CNTRL0_BASE)
91 return pll_div(pllbase, PLLC_POSTDIV);
96 static unsigned pll_sysclk_mhz(unsigned pll_addr, unsigned div)
98 volatile void *pllbase = (volatile void *) pll_addr;
99 unsigned base = CONFIG_SYS_HZ_CLOCK / 1000;
101 /* the PLL might be bypassed */
102 if (REG(pllbase + PLLC_PLLCTL) & BIT(0)) {
103 base /= pll_prediv(pllbase);
104 base *= 1 + (REG(pllbase + PLLC_PLLM) & 0x0ff);
105 base /= pll_postdiv(pllbase);
107 return DIV_ROUND_UP(base, 1000 * pll_div(pllbase, div));
110 int print_cpuinfo(void)
112 /* REVISIT fetch and display CPU ID and revision information
113 * too ... that will matter as more revisions appear.
115 printf("Cores: ARM %d MHz",
116 pll_sysclk_mhz(DAVINCI_PLL_CNTRL0_BASE, ARM_PLLDIV));
119 printf(", DSP %d MHz",
120 pll_sysclk_mhz(DAVINCI_PLL_CNTRL0_BASE, DSP_PLLDIV));
123 printf("\nDDR: %d MHz\n",
124 /* DDR PHY uses an x2 input clock */
125 pll_sysclk_mhz(DAVINCI_PLL_CNTRL1_BASE, DDR_PLLDIV)