2 * Jz4740 common routines
3 * Copyright (c) 2006 Ingenic Semiconductor, <jlwei@ingenic.cn>
5 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/jz4740.h>
13 void enable_interrupts(void)
17 int disable_interrupts(void)
23 * PLL output clock = EXTAL * NF / (NR * NO)
24 * NF = FD + 2, NR = RD + 2
25 * NO = 1 (if OD = 0), NO = 2 (if OD = 1 or 2), NO = 4 (if OD = 3)
29 struct jz4740_cpm *cpm = (struct jz4740_cpm *)JZ4740_CPM_BASE;
31 register unsigned int cfcr, plcr1;
33 0, 0, 1, 2, 3, 0, 4, 0, 5, 0, 0, 0, 6, 0, 0, 0,
34 7, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0,
37 int div[5] = {1, 3, 3, 3, 3}; /* divisors of I:S:P:L:M */
40 cfcr = CPM_CPCCR_CLKOEN |
42 (n2FR[div[0]] << CPM_CPCCR_CDIV_BIT) |
43 (n2FR[div[1]] << CPM_CPCCR_HDIV_BIT) |
44 (n2FR[div[2]] << CPM_CPCCR_PDIV_BIT) |
45 (n2FR[div[3]] << CPM_CPCCR_MDIV_BIT) |
46 (n2FR[div[4]] << CPM_CPCCR_LDIV_BIT);
48 pllout2 = (cfcr & CPM_CPCCR_PCS) ?
49 CONFIG_SYS_CPU_SPEED : (CONFIG_SYS_CPU_SPEED / 2);
51 /* Init USB Host clock, pllout2 must be n*48MHz */
52 writel(pllout2 / 48000000 - 1, &cpm->uhccdr);
54 nf = CONFIG_SYS_CPU_SPEED * 2 / CONFIG_SYS_EXTAL;
55 plcr1 = ((nf - 2) << CPM_CPPCR_PLLM_BIT) | /* FD */
56 (0 << CPM_CPPCR_PLLN_BIT) | /* RD=0, NR=2 */
57 (0 << CPM_CPPCR_PLLOD_BIT) | /* OD=0, NO=1 */
58 (0x20 << CPM_CPPCR_PLLST_BIT) | /* PLL stable time */
59 CPM_CPPCR_PLLEN; /* enable PLL */
62 writel(cfcr, &cpm->cpccr);
63 writel(plcr1, &cpm->cppcr);
68 struct jz4740_emc *emc = (struct jz4740_emc *)JZ4740_EMC_BASE;
70 register unsigned int dmcr0, dmcr, sdmode, tmp, cpu_clk, mem_clk, ns;
72 unsigned int cas_latency_sdmr[2] = {
77 unsigned int cas_latency_dmcr[2] = {
78 1 << EMC_DMCR_TCL_BIT, /* CAS latency is 2 */
79 2 << EMC_DMCR_TCL_BIT /* CAS latency is 3 */
82 int div[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
84 cpu_clk = CONFIG_SYS_CPU_SPEED;
85 mem_clk = cpu_clk * div[__cpm_get_cdiv()] / div[__cpm_get_mdiv()];
87 writel(0, &emc->bcr); /* Disable bus release */
88 writew(0, &emc->rtcsr); /* Disable clock for counting */
90 /* Fault DMCR value for mode register setting*/
93 #define SDRAM_BANK40 0
95 dmcr0 = ((SDRAM_ROW0 - 11) << EMC_DMCR_RA_BIT) |
96 ((SDRAM_COL0 - 8) << EMC_DMCR_CA_BIT) |
97 (SDRAM_BANK40 << EMC_DMCR_BA_BIT) |
98 (SDRAM_BW16 << EMC_DMCR_BW_BIT) |
100 cas_latency_dmcr[((SDRAM_CASL == 3) ? 1 : 0)];
102 /* Basic DMCR value */
103 dmcr = ((SDRAM_ROW - 11) << EMC_DMCR_RA_BIT) |
104 ((SDRAM_COL - 8) << EMC_DMCR_CA_BIT) |
105 (SDRAM_BANK4 << EMC_DMCR_BA_BIT) |
106 (SDRAM_BW16 << EMC_DMCR_BW_BIT) |
108 cas_latency_dmcr[((SDRAM_CASL == 3) ? 1 : 0)];
111 ns = 1000000000 / mem_clk;
112 tmp = SDRAM_TRAS / ns;
117 dmcr |= (tmp - 4) << EMC_DMCR_TRAS_BIT;
118 tmp = SDRAM_RCD / ns;
122 dmcr |= tmp << EMC_DMCR_RCD_BIT;
123 tmp = SDRAM_TPC / ns;
127 dmcr |= tmp << EMC_DMCR_TPC_BIT;
128 tmp = SDRAM_TRWL / ns;
132 dmcr |= tmp << EMC_DMCR_TRWL_BIT;
133 tmp = (SDRAM_TRAS + SDRAM_TPC) / ns;
137 dmcr |= ((tmp + 1) >> 1) << EMC_DMCR_TRC_BIT;
139 /* SDRAM mode value */
140 sdmode = EMC_SDMR_BT_SEQ |
143 cas_latency_sdmr[((SDRAM_CASL == 3) ? 1 : 0)];
145 /* Stage 1. Precharge all banks by writing SDMR with DMCR.MRSET=0 */
146 writel(dmcr, &emc->dmcr);
147 writeb(0, JZ4740_EMC_SDMR0 | sdmode);
149 /* Wait for precharge, > 200us */
150 tmp = (cpu_clk / 1000000) * 1000;
154 /* Stage 2. Enable auto-refresh */
155 writel(dmcr | EMC_DMCR_RFSH, &emc->dmcr);
157 tmp = SDRAM_TREF / ns;
161 writew(tmp, &emc->rtcor);
162 writew(0, &emc->rtcnt);
163 /* Divisor is 64, CKO/64 */
164 writew(EMC_RTCSR_CKS_64, &emc->rtcsr);
166 /* Wait for number of auto-refresh cycles */
167 tmp = (cpu_clk / 1000000) * 1000;
171 /* Stage 3. Mode Register Set */
172 writel(dmcr0 | EMC_DMCR_RFSH | EMC_DMCR_MRSET, &emc->dmcr);
173 writeb(0, JZ4740_EMC_SDMR0 | sdmode);
175 /* Set back to basic DMCR value */
176 writel(dmcr | EMC_DMCR_RFSH | EMC_DMCR_MRSET, &emc->dmcr);
178 /* everything is ok now */
181 DECLARE_GLOBAL_DATA_PTR;
183 void calc_clocks(void)
186 unsigned int div[10] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
188 pllout = __cpm_get_pllout();
190 gd->cpu_clk = pllout / div[__cpm_get_cdiv()];
191 gd->arch.sys_clk = pllout / div[__cpm_get_hdiv()];
192 gd->arch.per_clk = pllout / div[__cpm_get_pdiv()];
193 gd->mem_clk = pllout / div[__cpm_get_mdiv()];
194 gd->arch.dev_clk = CONFIG_SYS_EXTAL;
199 struct jz4740_rtc *rtc = (struct jz4740_rtc *)JZ4740_RTC_BASE;
201 while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
203 writel(readl(&rtc->rcr) | RTC_RCR_AE, &rtc->rcr); /* enable alarm */
205 while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
207 writel(0x00007fff, &rtc->rgr); /* type value */
209 while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
211 writel(0x0000ffe0, &rtc->hwfcr); /* Power on delay 2s */
213 while (!(readl(&rtc->rcr) & RTC_RCR_WRDY))
215 writel(0x00000fe0, &rtc->hrcr); /* reset delay 125ms */
218 /* U-Boot common routines */
219 phys_size_t initdram(int board_type)
221 struct jz4740_emc *emc = (struct jz4740_emc *)JZ4740_EMC_BASE;
223 u32 rows, cols, dw, banks;
226 dmcr = readl(&emc->dmcr);
227 rows = 11 + ((dmcr & EMC_DMCR_RA_MASK) >> EMC_DMCR_RA_BIT);
228 cols = 8 + ((dmcr & EMC_DMCR_CA_MASK) >> EMC_DMCR_CA_BIT);
229 dw = (dmcr & EMC_DMCR_BW) ? 2 : 4;
230 banks = (dmcr & EMC_DMCR_BA) ? 4 : 2;
232 size = (1 << (rows + cols)) * dw * banks;