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/*
* Jz4740 common routines
* Copyright (c) 2006 Ingenic Semiconductor, <jlwei@ingenic.cn>
*
* 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 <config.h>
#include <common.h>
#include <asm/io.h>
#include <asm/jz4740.h>
void enable_interrupts(void)
{
}
int disable_interrupts(void)
{
return 0;
}
/*
* PLL output clock = EXTAL * NF / (NR * NO)
* NF = FD + 2, NR = RD + 2
* NO = 1 (if OD = 0), NO = 2 (if OD = 1 or 2), NO = 4 (if OD = 3)
*/
void pll_init(void)
{
struct jz4740_cpm *cpm = (struct jz4740_cpm *)JZ4740_CPM_BASE;
register unsigned int cfcr, plcr1;
int n2FR[33] = {
0, 0, 1, 2, 3, 0, 4, 0, 5, 0, 0, 0, 6, 0, 0, 0,
7, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0,
9
};
int div[5] = {1, 3, 3, 3, 3}; /* divisors of I:S:P:L:M */
int nf, pllout2;
cfcr = CPM_CPCCR_CLKOEN |
CPM_CPCCR_PCS |
(n2FR[div[0]] << CPM_CPCCR_CDIV_BIT) |
(n2FR[div[1]] << CPM_CPCCR_HDIV_BIT) |
(n2FR[div[2]] << CPM_CPCCR_PDIV_BIT) |
(n2FR[div[3]] << CPM_CPCCR_MDIV_BIT) |
(n2FR[div[4]] << CPM_CPCCR_LDIV_BIT);
pllout2 = (cfcr & CPM_CPCCR_PCS) ?
CONFIG_SYS_CPU_SPEED : (CONFIG_SYS_CPU_SPEED / 2);
/* Init USB Host clock, pllout2 must be n*48MHz */
writel(pllout2 / 48000000 - 1, &cpm->uhccdr);
nf = CONFIG_SYS_CPU_SPEED * 2 / CONFIG_SYS_EXTAL;
plcr1 = ((nf - 2) << CPM_CPPCR_PLLM_BIT) | /* FD */
(0 << CPM_CPPCR_PLLN_BIT) | /* RD=0, NR=2 */
(0 << CPM_CPPCR_PLLOD_BIT) | /* OD=0, NO=1 */
(0x20 << CPM_CPPCR_PLLST_BIT) | /* PLL stable time */
CPM_CPPCR_PLLEN; /* enable PLL */
/* init PLL */
writel(cfcr, &cpm->cpccr);
writel(plcr1, &cpm->cppcr);
}
void sdram_init(void)
{
struct jz4740_emc *emc = (struct jz4740_emc *)JZ4740_EMC_BASE;
register unsigned int dmcr0, dmcr, sdmode, tmp, cpu_clk, mem_clk, ns;
unsigned int cas_latency_sdmr[2] = {
EMC_SDMR_CAS_2,
EMC_SDMR_CAS_3,
};
unsigned int cas_latency_dmcr[2] = {
1 << EMC_DMCR_TCL_BIT, /* CAS latency is 2 */
2 << EMC_DMCR_TCL_BIT /* CAS latency is 3 */
};
int div[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
cpu_clk = CONFIG_SYS_CPU_SPEED;
mem_clk = cpu_clk * div[__cpm_get_cdiv()] / div[__cpm_get_mdiv()];
writel(0, &emc->bcr); /* Disable bus release */
writew(0, &emc->rtcsr); /* Disable clock for counting */
/* Fault DMCR value for mode register setting*/
#define SDRAM_ROW0 11
#define SDRAM_COL0 8
#define SDRAM_BANK40 0
dmcr0 = ((SDRAM_ROW0 - 11) << EMC_DMCR_RA_BIT) |
((SDRAM_COL0 - 8) << EMC_DMCR_CA_BIT) |
(SDRAM_BANK40 << EMC_DMCR_BA_BIT) |
(SDRAM_BW16 << EMC_DMCR_BW_BIT) |
EMC_DMCR_EPIN |
cas_latency_dmcr[((SDRAM_CASL == 3) ? 1 : 0)];
/* Basic DMCR value */
dmcr = ((SDRAM_ROW - 11) << EMC_DMCR_RA_BIT) |
((SDRAM_COL - 8) << EMC_DMCR_CA_BIT) |
(SDRAM_BANK4 << EMC_DMCR_BA_BIT) |
(SDRAM_BW16 << EMC_DMCR_BW_BIT) |
EMC_DMCR_EPIN |
cas_latency_dmcr[((SDRAM_CASL == 3) ? 1 : 0)];
/* SDRAM timimg */
ns = 1000000000 / mem_clk;
tmp = SDRAM_TRAS / ns;
if (tmp < 4)
tmp = 4;
if (tmp > 11)
tmp = 11;
dmcr |= (tmp - 4) << EMC_DMCR_TRAS_BIT;
tmp = SDRAM_RCD / ns;
if (tmp > 3)
tmp = 3;
dmcr |= tmp << EMC_DMCR_RCD_BIT;
tmp = SDRAM_TPC / ns;
if (tmp > 7)
tmp = 7;
dmcr |= tmp << EMC_DMCR_TPC_BIT;
tmp = SDRAM_TRWL / ns;
if (tmp > 3)
tmp = 3;
dmcr |= tmp << EMC_DMCR_TRWL_BIT;
tmp = (SDRAM_TRAS + SDRAM_TPC) / ns;
if (tmp > 14)
tmp = 14;
dmcr |= ((tmp + 1) >> 1) << EMC_DMCR_TRC_BIT;
/* SDRAM mode value */
sdmode = EMC_SDMR_BT_SEQ |
EMC_SDMR_OM_NORMAL |
EMC_SDMR_BL_4 |
cas_latency_sdmr[((SDRAM_CASL == 3) ? 1 : 0)];
/* Stage 1. Precharge all banks by writing SDMR with DMCR.MRSET=0 */
writel(dmcr, &emc->dmcr);
writeb(0, JZ4740_EMC_SDMR0 | sdmode);
/* Wait for precharge, > 200us */
tmp = (cpu_clk / 1000000) * 1000;
while (tmp--)
;
/* Stage 2. Enable auto-refresh */
writel(dmcr | EMC_DMCR_RFSH, &emc->dmcr);
tmp = SDRAM_TREF / ns;
tmp = tmp / 64 + 1;
if (tmp > 0xff)
tmp = 0xff;
writew(tmp, &emc->rtcor);
writew(0, &emc->rtcnt);
/* Divisor is 64, CKO/64 */
writew(EMC_RTCSR_CKS_64, &emc->rtcsr);
/* Wait for number of auto-refresh cycles */
tmp = (cpu_clk / 1000000) * 1000;
while (tmp--)
;
/* Stage 3. Mode Register Set */
writel(dmcr0 | EMC_DMCR_RFSH | EMC_DMCR_MRSET, &emc->dmcr);
writeb(0, JZ4740_EMC_SDMR0 | sdmode);
/* Set back to basic DMCR value */
writel(dmcr | EMC_DMCR_RFSH | EMC_DMCR_MRSET, &emc->dmcr);
/* everything is ok now */
}
DECLARE_GLOBAL_DATA_PTR;
void calc_clocks(void)
{
unsigned int pllout;
unsigned int div[10] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
pllout = __cpm_get_pllout();
gd->cpu_clk = pllout / div[__cpm_get_cdiv()];
gd->arch.sys_clk = pllout / div[__cpm_get_hdiv()];
gd->arch.per_clk = pllout / div[__cpm_get_pdiv()];
gd->mem_clk = pllout / div[__cpm_get_mdiv()];
gd->arch.dev_clk = CONFIG_SYS_EXTAL;
}
void rtc_init(void)
{
struct jz4740_rtc *rtc = (struct jz4740_rtc *)JZ4740_RTC_BASE;
while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
;
writel(readl(&rtc->rcr) | RTC_RCR_AE, &rtc->rcr); /* enable alarm */
while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
;
writel(0x00007fff, &rtc->rgr); /* type value */
while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
;
writel(0x0000ffe0, &rtc->hwfcr); /* Power on delay 2s */
while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
;
writel(0x00000fe0, &rtc->hrcr); /* reset delay 125ms */
}
/* U-Boot common routines */
phys_size_t initdram(int board_type)
{
struct jz4740_emc *emc = (struct jz4740_emc *)JZ4740_EMC_BASE;
u32 dmcr;
u32 rows, cols, dw, banks;
ulong size;
dmcr = readl(&emc->dmcr);
rows = 11 + ((dmcr & EMC_DMCR_RA_MASK) >> EMC_DMCR_RA_BIT);
cols = 8 + ((dmcr & EMC_DMCR_CA_MASK) >> EMC_DMCR_CA_BIT);
dw = (dmcr & EMC_DMCR_BW) ? 2 : 4;
banks = (dmcr & EMC_DMCR_BA) ? 4 : 2;
size = (1 << (rows + cols)) * dw * banks;
return size;
}
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