1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Sun8i a33 platform dram controller init.
4 *
5 * (C) Copyright 2007-2015 Allwinner Technology Co.
6 * Jerry Wang <wangflord@allwinnertech.com>
7 * (C) Copyright 2015 Vishnu Patekar <vishnupatekar0510@gmail.com>
8 * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
9 */
10 #include <common.h>
11 #include <errno.h>
12 #include <asm/io.h>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/dram.h>
15 #include <asm/arch/prcm.h>
16
17 /* PLL runs at 2x dram-clk, controller runs at PLL / 4 (dram-clk / 2) */
18 #define DRAM_CLK_MUL 2
19 #define DRAM_CLK_DIV 4
20 #define DRAM_SIGMA_DELTA_ENABLE 1
21
22 struct dram_para {
23 u8 cs1;
24 u8 seq;
25 u8 bank;
26 u8 rank;
27 u8 rows;
28 u8 bus_width;
29 u16 page_size;
30 };
31
mctl_set_cr(struct dram_para * para)32 static void mctl_set_cr(struct dram_para *para)
33 {
34 struct sunxi_mctl_com_reg * const mctl_com =
35 (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
36
37 writel(MCTL_CR_CS1_CONTROL(para->cs1) | MCTL_CR_UNKNOWN |
38 MCTL_CR_CHANNEL(1) | MCTL_CR_DDR3 |
39 (para->seq ? MCTL_CR_SEQUENCE : 0) |
40 ((para->bus_width == 16) ? MCTL_CR_BUSW16 : MCTL_CR_BUSW8) |
41 MCTL_CR_PAGE_SIZE(para->page_size) | MCTL_CR_ROW(para->rows) |
42 MCTL_CR_BANK(para->bank) | MCTL_CR_RANK(para->rank),
43 &mctl_com->cr);
44 }
45
auto_detect_dram_size(struct dram_para * para)46 static void auto_detect_dram_size(struct dram_para *para)
47 {
48 u8 orig_rank = para->rank;
49 int rows, columns;
50
51 /* Row detect */
52 para->page_size = 512;
53 para->seq = 1;
54 para->rows = 16;
55 para->rank = 1;
56 mctl_set_cr(para);
57 for (rows = 11 ; rows < 16 ; rows++) {
58 if (mctl_mem_matches(1 << (rows + 9))) /* row-column */
59 break;
60 }
61
62 /* Column (page size) detect */
63 para->rows = 11;
64 para->page_size = 8192;
65 mctl_set_cr(para);
66 for (columns = 9 ; columns < 13 ; columns++) {
67 if (mctl_mem_matches(1 << columns))
68 break;
69 }
70
71 para->seq = 0;
72 para->rank = orig_rank;
73 para->rows = rows;
74 para->page_size = 1 << columns;
75 mctl_set_cr(para);
76 }
77
ns_to_t(int nanoseconds)78 static inline int ns_to_t(int nanoseconds)
79 {
80 const unsigned int ctrl_freq =
81 CONFIG_DRAM_CLK * DRAM_CLK_MUL / DRAM_CLK_DIV;
82
83 return (ctrl_freq * nanoseconds + 999) / 1000;
84 }
85
auto_set_timing_para(struct dram_para * para)86 static void auto_set_timing_para(struct dram_para *para)
87 {
88 struct sunxi_mctl_ctl_reg * const mctl_ctl =
89 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
90 u32 reg_val;
91
92 u8 tccd = 2;
93 u8 tfaw = ns_to_t(50);
94 u8 trrd = max(ns_to_t(10), 4);
95 u8 trcd = ns_to_t(15);
96 u8 trc = ns_to_t(53);
97 u8 txp = max(ns_to_t(8), 3);
98 u8 twtr = max(ns_to_t(8), 4);
99 u8 trtp = max(ns_to_t(8), 4);
100 u8 twr = max(ns_to_t(15), 3);
101 u8 trp = ns_to_t(15);
102 u8 tras = ns_to_t(38);
103
104 u16 trefi = ns_to_t(7800) / 32;
105 u16 trfc = ns_to_t(350);
106
107 /* Fixed timing parameters */
108 u8 tmrw = 0;
109 u8 tmrd = 4;
110 u8 tmod = 12;
111 u8 tcke = 3;
112 u8 tcksrx = 5;
113 u8 tcksre = 5;
114 u8 tckesr = 4;
115 u8 trasmax = 24;
116 u8 tcl = 6; /* CL 12 */
117 u8 tcwl = 4; /* CWL 8 */
118 u8 t_rdata_en = 4;
119 u8 wr_latency = 2;
120
121 u32 tdinit0 = (500 * CONFIG_DRAM_CLK) + 1; /* 500us */
122 u32 tdinit1 = (360 * CONFIG_DRAM_CLK) / 1000 + 1; /* 360ns */
123 u32 tdinit2 = (200 * CONFIG_DRAM_CLK) + 1; /* 200us */
124 u32 tdinit3 = (1 * CONFIG_DRAM_CLK) + 1; /* 1us */
125
126 u8 twtp = tcwl + 2 + twr; /* WL + BL / 2 + tWR */
127 u8 twr2rd = tcwl + 2 + twtr; /* WL + BL / 2 + tWTR */
128 u8 trd2wr = tcl + 2 + 1 - tcwl; /* RL + BL / 2 + 2 - WL */
129
130 /* Set work mode register */
131 mctl_set_cr(para);
132 /* Set mode register */
133 writel(MCTL_MR0, &mctl_ctl->mr0);
134 writel(MCTL_MR1, &mctl_ctl->mr1);
135 writel(MCTL_MR2, &mctl_ctl->mr2);
136 writel(MCTL_MR3, &mctl_ctl->mr3);
137 /* Set dram timing */
138 reg_val = (twtp << 24) | (tfaw << 16) | (trasmax << 8) | (tras << 0);
139 writel(reg_val, &mctl_ctl->dramtmg0);
140 reg_val = (txp << 16) | (trtp << 8) | (trc << 0);
141 writel(reg_val, &mctl_ctl->dramtmg1);
142 reg_val = (tcwl << 24) | (tcl << 16) | (trd2wr << 8) | (twr2rd << 0);
143 writel(reg_val, &mctl_ctl->dramtmg2);
144 reg_val = (tmrw << 16) | (tmrd << 12) | (tmod << 0);
145 writel(reg_val, &mctl_ctl->dramtmg3);
146 reg_val = (trcd << 24) | (tccd << 16) | (trrd << 8) | (trp << 0);
147 writel(reg_val, &mctl_ctl->dramtmg4);
148 reg_val = (tcksrx << 24) | (tcksre << 16) | (tckesr << 8) | (tcke << 0);
149 writel(reg_val, &mctl_ctl->dramtmg5);
150 /* Set two rank timing and exit self-refresh timing */
151 reg_val = readl(&mctl_ctl->dramtmg8);
152 reg_val &= ~(0xff << 8);
153 reg_val &= ~(0xff << 0);
154 reg_val |= (0x33 << 8);
155 reg_val |= (0x10 << 0);
156 writel(reg_val, &mctl_ctl->dramtmg8);
157 /* Set phy interface time */
158 reg_val = (0x2 << 24) | (t_rdata_en << 16) | (0x1 << 8)
159 | (wr_latency << 0);
160 /* PHY interface write latency and read latency configure */
161 writel(reg_val, &mctl_ctl->pitmg0);
162 /* Set phy time PTR0-2 use default */
163 writel(((tdinit0 << 0) | (tdinit1 << 20)), &mctl_ctl->ptr3);
164 writel(((tdinit2 << 0) | (tdinit3 << 20)), &mctl_ctl->ptr4);
165 /* Set refresh timing */
166 reg_val = (trefi << 16) | (trfc << 0);
167 writel(reg_val, &mctl_ctl->rfshtmg);
168 }
169
mctl_set_pir(u32 val)170 static void mctl_set_pir(u32 val)
171 {
172 struct sunxi_mctl_ctl_reg * const mctl_ctl =
173 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
174
175 writel(val, &mctl_ctl->pir);
176 mctl_await_completion(&mctl_ctl->pgsr0, 0x1, 0x1);
177 }
178
mctl_data_train_cfg(struct dram_para * para)179 static void mctl_data_train_cfg(struct dram_para *para)
180 {
181 struct sunxi_mctl_ctl_reg * const mctl_ctl =
182 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
183
184 if (para->rank == 2)
185 clrsetbits_le32(&mctl_ctl->dtcr, 0x3 << 24, 0x3 << 24);
186 else
187 clrsetbits_le32(&mctl_ctl->dtcr, 0x3 << 24, 0x1 << 24);
188 }
189
mctl_train_dram(struct dram_para * para)190 static int mctl_train_dram(struct dram_para *para)
191 {
192 struct sunxi_mctl_ctl_reg * const mctl_ctl =
193 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
194
195 mctl_data_train_cfg(para);
196 mctl_set_pir(0x5f3);
197
198 return ((readl(&mctl_ctl->pgsr0) >> 20) & 0xff) ? -EIO : 0;
199 }
200
mctl_channel_init(struct dram_para * para)201 static int mctl_channel_init(struct dram_para *para)
202 {
203 struct sunxi_mctl_ctl_reg * const mctl_ctl =
204 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
205 struct sunxi_mctl_com_reg * const mctl_com =
206 (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
207 u32 low_data_lines_status; /* Training status of datalines 0 - 7 */
208 u32 high_data_lines_status; /* Training status of datalines 8 - 15 */
209
210 auto_set_timing_para(para);
211
212 /* Disable dram VTC */
213 clrbits_le32(&mctl_ctl->pgcr0, 0x3f << 0);
214
215 /* Set ODT */
216 if ((CONFIG_DRAM_CLK > 400) && IS_ENABLED(CONFIG_DRAM_ODT_EN)) {
217 setbits_le32(DXnGCR0(0), 0x3 << 9);
218 setbits_le32(DXnGCR0(1), 0x3 << 9);
219 } else {
220 clrbits_le32(DXnGCR0(0), 0x3 << 9);
221 clrbits_le32(DXnGCR0(1), 0x3 << 9);
222 }
223
224 /* set PLL configuration */
225 if (CONFIG_DRAM_CLK >= 480)
226 setbits_le32(&mctl_ctl->pllgcr, 0x1 << 18);
227 else
228 setbits_le32(&mctl_ctl->pllgcr, 0x3 << 18);
229
230 /* Auto detect dram config, set 2 rank and 16bit bus-width */
231 para->cs1 = 0;
232 para->rank = 2;
233 para->bus_width = 16;
234 mctl_set_cr(para);
235
236 /* Open DQS gating */
237 clrbits_le32(&mctl_ctl->pgcr2, (0x3 << 6));
238 clrbits_le32(&mctl_ctl->dqsgmr, (0x1 << 8) | (0x7));
239
240 mctl_data_train_cfg(para);
241
242 /* ZQ calibration */
243 writel(CONFIG_DRAM_ZQ & 0xff, &mctl_ctl->zqcr1);
244 /* CA calibration */
245 mctl_set_pir(0x00000003);
246 /* More ZQ calibration */
247 writel(readl(&mctl_ctl->zqsr0) | 0x10000000, &mctl_ctl->zqcr2);
248 writel((CONFIG_DRAM_ZQ >> 8) & 0xff, &mctl_ctl->zqcr1);
249
250 /* DQS gate training */
251 if (mctl_train_dram(para) != 0) {
252 low_data_lines_status = (readl(DXnGSR0(0)) >> 24) & 0x03;
253 high_data_lines_status = (readl(DXnGSR0(1)) >> 24) & 0x03;
254
255 if (low_data_lines_status == 0x3)
256 return -EIO;
257
258 /* DRAM has only one rank */
259 para->rank = 1;
260 mctl_set_cr(para);
261
262 if (low_data_lines_status == high_data_lines_status)
263 goto done; /* 16 bit bus, 1 rank */
264
265 if (!(low_data_lines_status & high_data_lines_status)) {
266 /* Retry 16 bit bus-width with CS1 set */
267 para->cs1 = 1;
268 mctl_set_cr(para);
269 if (mctl_train_dram(para) == 0)
270 goto done;
271 }
272
273 /* Try 8 bit bus-width */
274 writel(0x0, DXnGCR0(1)); /* Disable high DQ */
275 para->cs1 = 0;
276 para->bus_width = 8;
277 mctl_set_cr(para);
278 if (mctl_train_dram(para) != 0)
279 return -EIO;
280 }
281 done:
282 /* Check the dramc status */
283 mctl_await_completion(&mctl_ctl->statr, 0x1, 0x1);
284
285 /* Close DQS gating */
286 setbits_le32(&mctl_ctl->pgcr2, 0x3 << 6);
287
288 /* Enable master access */
289 writel(0xffffffff, &mctl_com->maer);
290
291 return 0;
292 }
293
mctl_sys_init(struct dram_para * para)294 static void mctl_sys_init(struct dram_para *para)
295 {
296 struct sunxi_ccm_reg * const ccm =
297 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
298 struct sunxi_mctl_ctl_reg * const mctl_ctl =
299 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
300 struct sunxi_mctl_com_reg * const mctl_com =
301 (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
302
303 clrsetbits_le32(&ccm->dram_pll_cfg, CCM_DRAMPLL_CFG_SRC_MASK,
304 CCM_DRAMPLL_CFG_SRC_PLL11);
305
306 clock_set_pll11(CONFIG_DRAM_CLK * 1000000 * DRAM_CLK_MUL,
307 DRAM_SIGMA_DELTA_ENABLE);
308
309 clrsetbits_le32(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_DIV_MASK,
310 CCM_DRAMCLK_CFG_DIV(DRAM_CLK_DIV) |
311 CCM_DRAMCLK_CFG_RST | CCM_DRAMCLK_CFG_UPD);
312 mctl_await_completion(&ccm->dram_clk_cfg, CCM_DRAMCLK_CFG_UPD, 0);
313
314 setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_RESET_OFFSET_MCTL);
315 setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MCTL);
316 setbits_le32(&ccm->mbus_reset, CCM_MBUS_RESET_RESET);
317 setbits_le32(&ccm->mbus0_clk_cfg, MBUS_CLK_GATE);
318
319 /* Set dram master access priority */
320 writel(0x0, &mctl_com->mapr);
321 writel(0x0f802f01, &mctl_ctl->sched);
322 writel(0x0000400f, &mctl_ctl->clken); /* normal */
323
324 udelay(250);
325 }
326
sunxi_dram_init(void)327 unsigned long sunxi_dram_init(void)
328 {
329 struct sunxi_mctl_com_reg * const mctl_com =
330 (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
331 struct sunxi_mctl_ctl_reg * const mctl_ctl =
332 (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
333
334 struct dram_para para = {
335 .cs1 = 0,
336 .bank = 1,
337 .rank = 2,
338 .rows = 15,
339 .bus_width = 16,
340 .page_size = 2048,
341 };
342
343 mctl_sys_init(¶);
344
345 if (mctl_channel_init(¶) != 0)
346 return 0;
347
348 auto_detect_dram_size(¶);
349
350 /* Enable master software clk */
351 writel(readl(&mctl_com->swonr) | 0x3ffff, &mctl_com->swonr);
352
353 /* Set DRAM ODT MAP */
354 if (para.rank == 2)
355 writel(0x00000303, &mctl_ctl->odtmap);
356 else
357 writel(0x00000201, &mctl_ctl->odtmap);
358
359 return para.page_size * (para.bus_width / 8) *
360 (1 << (para.bank + para.rank + para.rows));
361 }
362