1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2009
4 * Marvell Semiconductor <www.marvell.com>
5 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
6 */
7
8 #include <config.h>
9 #include <common.h>
10 #include <init.h>
11 #include <asm/global_data.h>
12 #include <asm/io.h>
13 #include <asm/arch/cpu.h>
14 #include <asm/arch/soc.h>
15
16 #if defined(CONFIG_ARCH_MVEBU)
17 /* Use common XOR definitions for A3x and AXP */
18 #include "../../../drivers/ddr/marvell/axp/xor.h"
19 #include "../../../drivers/ddr/marvell/axp/xor_regs.h"
20 #endif
21
22 DECLARE_GLOBAL_DATA_PTR;
23
24 struct sdram_bank {
25 u32 win_bar;
26 u32 win_sz;
27 };
28
29 struct sdram_addr_dec {
30 struct sdram_bank sdram_bank[4];
31 };
32
33 #define REG_CPUCS_WIN_ENABLE (1 << 0)
34 #define REG_CPUCS_WIN_WR_PROTECT (1 << 1)
35 #define REG_CPUCS_WIN_WIN0_CS(x) (((x) & 0x3) << 2)
36 #define REG_CPUCS_WIN_SIZE(x) (((x) & 0xff) << 24)
37
38 #ifndef MVEBU_SDRAM_SIZE_MAX
39 #define MVEBU_SDRAM_SIZE_MAX 0xc0000000
40 #endif
41
42 #define SCRUB_MAGIC 0xbeefdead
43
44 #define SCRB_XOR_UNIT 0
45 #define SCRB_XOR_CHAN 1
46 #define SCRB_XOR_WIN 0
47
48 #define XEBARX_BASE_OFFS 16
49
50 /*
51 * mvebu_sdram_bar - reads SDRAM Base Address Register
52 */
mvebu_sdram_bar(enum memory_bank bank)53 u32 mvebu_sdram_bar(enum memory_bank bank)
54 {
55 struct sdram_addr_dec *base =
56 (struct sdram_addr_dec *)MVEBU_SDRAM_BASE;
57 u32 result = 0;
58 u32 enable = 0x01 & readl(&base->sdram_bank[bank].win_sz);
59
60 if ((!enable) || (bank > BANK3))
61 return 0;
62
63 result = readl(&base->sdram_bank[bank].win_bar);
64 return result;
65 }
66
67 /*
68 * mvebu_sdram_bs_set - writes SDRAM Bank size
69 */
mvebu_sdram_bs_set(enum memory_bank bank,u32 size)70 static void mvebu_sdram_bs_set(enum memory_bank bank, u32 size)
71 {
72 struct sdram_addr_dec *base =
73 (struct sdram_addr_dec *)MVEBU_SDRAM_BASE;
74 /* Read current register value */
75 u32 reg = readl(&base->sdram_bank[bank].win_sz);
76
77 /* Clear window size */
78 reg &= ~REG_CPUCS_WIN_SIZE(0xFF);
79
80 /* Set new window size */
81 reg |= REG_CPUCS_WIN_SIZE((size - 1) >> 24);
82
83 writel(reg, &base->sdram_bank[bank].win_sz);
84 }
85
86 /*
87 * mvebu_sdram_bs - reads SDRAM Bank size
88 */
mvebu_sdram_bs(enum memory_bank bank)89 u32 mvebu_sdram_bs(enum memory_bank bank)
90 {
91 struct sdram_addr_dec *base =
92 (struct sdram_addr_dec *)MVEBU_SDRAM_BASE;
93 u32 result = 0;
94 u32 enable = 0x01 & readl(&base->sdram_bank[bank].win_sz);
95
96 if ((!enable) || (bank > BANK3))
97 return 0;
98 result = 0xff000000 & readl(&base->sdram_bank[bank].win_sz);
99 result += 0x01000000;
100 return result;
101 }
102
mvebu_sdram_size_adjust(enum memory_bank bank)103 void mvebu_sdram_size_adjust(enum memory_bank bank)
104 {
105 u32 size;
106
107 /* probe currently equipped RAM size */
108 size = get_ram_size((void *)mvebu_sdram_bar(bank),
109 mvebu_sdram_bs(bank));
110
111 /* adjust SDRAM window size accordingly */
112 mvebu_sdram_bs_set(bank, size);
113 }
114
115 #if defined(CONFIG_ARCH_MVEBU)
116 static u32 xor_ctrl_save;
117 static u32 xor_base_save;
118 static u32 xor_mask_save;
119
mv_xor_init2(u32 cs)120 static void mv_xor_init2(u32 cs)
121 {
122 u32 reg, base, size, base2;
123 u32 bank_attr[4] = { 0xe00, 0xd00, 0xb00, 0x700 };
124
125 xor_ctrl_save = reg_read(XOR_WINDOW_CTRL_REG(SCRB_XOR_UNIT,
126 SCRB_XOR_CHAN));
127 xor_base_save = reg_read(XOR_BASE_ADDR_REG(SCRB_XOR_UNIT,
128 SCRB_XOR_WIN));
129 xor_mask_save = reg_read(XOR_SIZE_MASK_REG(SCRB_XOR_UNIT,
130 SCRB_XOR_WIN));
131
132 /* Enable Window x for each CS */
133 reg = 0x1;
134 reg |= (0x3 << 16);
135 reg_write(XOR_WINDOW_CTRL_REG(SCRB_XOR_UNIT, SCRB_XOR_CHAN), reg);
136
137 base = 0;
138 size = mvebu_sdram_bs(cs) - 1;
139 if (size) {
140 base2 = ((base / (64 << 10)) << XEBARX_BASE_OFFS) |
141 bank_attr[cs];
142 reg_write(XOR_BASE_ADDR_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN),
143 base2);
144
145 base += size + 1;
146 size = (size / (64 << 10)) << 16;
147 /* Window x - size - 256 MB */
148 reg_write(XOR_SIZE_MASK_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN), size);
149 }
150
151 mv_xor_hal_init(0);
152
153 return;
154 }
155
mv_xor_finish2(void)156 static void mv_xor_finish2(void)
157 {
158 reg_write(XOR_WINDOW_CTRL_REG(SCRB_XOR_UNIT, SCRB_XOR_CHAN),
159 xor_ctrl_save);
160 reg_write(XOR_BASE_ADDR_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN),
161 xor_base_save);
162 reg_write(XOR_SIZE_MASK_REG(SCRB_XOR_UNIT, SCRB_XOR_WIN),
163 xor_mask_save);
164 }
165
dram_ecc_scrubbing(void)166 static void dram_ecc_scrubbing(void)
167 {
168 int cs;
169 u32 size, temp;
170 u32 total_mem = 0;
171 u64 total;
172 u32 start_addr;
173
174 /*
175 * The DDR training code from the bin_hdr / SPL already
176 * scrubbed the DDR till 0x1000000. And the main U-Boot
177 * is loaded to an address < 0x1000000. So we need to
178 * skip this range to not re-scrub this area again.
179 */
180 temp = reg_read(REG_SDRAM_CONFIG_ADDR);
181 temp |= (1 << REG_SDRAM_CONFIG_IERR_OFFS);
182 reg_write(REG_SDRAM_CONFIG_ADDR, temp);
183
184 for (cs = 0; cs < CONFIG_NR_DRAM_BANKS; cs++) {
185 size = mvebu_sdram_bs(cs);
186 if (size == 0)
187 continue;
188
189 total = (u64)size;
190 total_mem += (u32)(total / (1 << 30));
191 start_addr = 0;
192 mv_xor_init2(cs);
193
194 /* Skip first 16 MiB */
195 if (0 == cs) {
196 start_addr = 0x1000000;
197 size -= start_addr;
198 }
199
200 mv_xor_mem_init(SCRB_XOR_CHAN, start_addr, size - 1,
201 SCRUB_MAGIC, SCRUB_MAGIC);
202
203 /* Wait for previous transfer completion */
204 while (mv_xor_state_get(SCRB_XOR_CHAN) != MV_IDLE)
205 ;
206
207 mv_xor_finish2();
208 }
209
210 temp = reg_read(REG_SDRAM_CONFIG_ADDR);
211 temp &= ~(1 << REG_SDRAM_CONFIG_IERR_OFFS);
212 reg_write(REG_SDRAM_CONFIG_ADDR, temp);
213 }
214
ecc_enabled(void)215 static int ecc_enabled(void)
216 {
217 if (reg_read(REG_SDRAM_CONFIG_ADDR) & (1 << REG_SDRAM_CONFIG_ECC_OFFS))
218 return 1;
219
220 return 0;
221 }
222
223 /* Return the width of the DRAM bus. */
bus_width(void)224 static int bus_width(void)
225 {
226 int full_width = 0;
227
228 if (reg_read(REG_SDRAM_CONFIG_ADDR) & (1 << REG_SDRAM_CONFIG_WIDTH_OFFS))
229 full_width = 1;
230
231 #ifdef CONFIG_ARMADA_XP
232 return full_width ? 64 : 32;
233 #else
234 return full_width ? 32 : 16;
235 #endif
236 }
237
cycle_mode(void)238 static int cycle_mode(void)
239 {
240 int val = reg_read(REG_DUNIT_CTRL_LOW_ADDR);
241
242 return (val >> REG_DUNIT_CTRL_LOW_2T_OFFS) & REG_DUNIT_CTRL_LOW_2T_MASK;
243 }
244
245 #else
dram_ecc_scrubbing(void)246 static void dram_ecc_scrubbing(void)
247 {
248 }
249
ecc_enabled(void)250 static int ecc_enabled(void)
251 {
252 return 0;
253 }
254 #endif
255
dram_init(void)256 int dram_init(void)
257 {
258 u64 size = 0;
259 int i;
260
261 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
262 /*
263 * It is assumed that all memory banks are consecutive
264 * and without gaps.
265 * If the gap is found, ram_size will be reported for
266 * consecutive memory only
267 */
268 if (mvebu_sdram_bar(i) != size)
269 break;
270
271 /*
272 * Don't report more than 3GiB of SDRAM, otherwise there is no
273 * address space left for the internal registers etc.
274 */
275 size += mvebu_sdram_bs(i);
276 if (size > MVEBU_SDRAM_SIZE_MAX)
277 size = MVEBU_SDRAM_SIZE_MAX;
278 }
279
280 if (ecc_enabled())
281 dram_ecc_scrubbing();
282
283 gd->ram_size = size;
284
285 return 0;
286 }
287
288 /*
289 * If this function is not defined here,
290 * board.c alters dram bank zero configuration defined above.
291 */
dram_init_banksize(void)292 int dram_init_banksize(void)
293 {
294 u64 size = 0;
295 int i;
296
297 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
298 gd->bd->bi_dram[i].start = mvebu_sdram_bar(i);
299 gd->bd->bi_dram[i].size = mvebu_sdram_bs(i);
300
301 /* Clip the banksize to 1GiB if it exceeds the max size */
302 size += gd->bd->bi_dram[i].size;
303 if (size > MVEBU_SDRAM_SIZE_MAX)
304 mvebu_sdram_bs_set(i, 0x40000000);
305 }
306
307 return 0;
308 }
309
310 #if defined(CONFIG_ARCH_MVEBU)
board_add_ram_info(int use_default)311 void board_add_ram_info(int use_default)
312 {
313 struct sar_freq_modes sar_freq;
314 int mode;
315 int width;
316
317 get_sar_freq(&sar_freq);
318 printf(" (%d MHz, ", sar_freq.d_clk);
319
320 width = bus_width();
321 if (width)
322 printf("%d-bit, ", width);
323
324 mode = cycle_mode();
325 /* Mode 0 = Single cycle
326 * Mode 1 = Two cycles (2T)
327 * Mode 2 = Three cycles (3T)
328 */
329 if (mode == 1)
330 printf("2T, ");
331 if (mode == 2)
332 printf("3T, ");
333
334 if (ecc_enabled())
335 printf("ECC");
336 else
337 printf("ECC not");
338 printf(" enabled)");
339 }
340 #endif
341