1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2013 Stefan Roese <sr@denx.de>
4 */
5
6 #include <common.h>
7 #include <asm/arch/sys_proto.h>
8 #include <linux/errno.h>
9 #include <asm/io.h>
10 #include <asm/mach-imx/regs-common.h>
11
12 DECLARE_GLOBAL_DATA_PTR;
13
14 /* 1 second delay should be plenty of time for block reset. */
15 #define RESET_MAX_TIMEOUT 1000000
16
17 #define MXS_BLOCK_SFTRST (1 << 31)
18 #define MXS_BLOCK_CLKGATE (1 << 30)
19
mxs_wait_mask_set(struct mxs_register_32 * reg,uint32_t mask,unsigned int timeout)20 int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned
21 int timeout)
22 {
23 while (--timeout) {
24 if ((readl(®->reg) & mask) == mask)
25 break;
26 udelay(1);
27 }
28
29 return !timeout;
30 }
31
mxs_wait_mask_clr(struct mxs_register_32 * reg,uint32_t mask,unsigned int timeout)32 int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned
33 int timeout)
34 {
35 while (--timeout) {
36 if ((readl(®->reg) & mask) == 0)
37 break;
38 udelay(1);
39 }
40
41 return !timeout;
42 }
43
mxs_reset_block(struct mxs_register_32 * reg)44 int mxs_reset_block(struct mxs_register_32 *reg)
45 {
46 /* Clear SFTRST */
47 writel(MXS_BLOCK_SFTRST, ®->reg_clr);
48
49 if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
50 return 1;
51
52 /* Clear CLKGATE */
53 writel(MXS_BLOCK_CLKGATE, ®->reg_clr);
54
55 /* Set SFTRST */
56 writel(MXS_BLOCK_SFTRST, ®->reg_set);
57
58 /* Wait for CLKGATE being set */
59 if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
60 return 1;
61
62 /* Clear SFTRST */
63 writel(MXS_BLOCK_SFTRST, ®->reg_clr);
64
65 if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT))
66 return 1;
67
68 /* Clear CLKGATE */
69 writel(MXS_BLOCK_CLKGATE, ®->reg_clr);
70
71 if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT))
72 return 1;
73
74 return 0;
75 }
76
get_sp(void)77 static ulong get_sp(void)
78 {
79 ulong ret;
80
81 asm("mov %0, sp" : "=r"(ret) : );
82 return ret;
83 }
84
board_lmb_reserve(struct lmb * lmb)85 void board_lmb_reserve(struct lmb *lmb)
86 {
87 ulong sp, bank_end;
88 int bank;
89
90 sp = get_sp();
91 debug("## Current stack ends at 0x%08lx ", sp);
92
93 /* adjust sp by 16K to be safe */
94 sp -= 4096 << 2;
95 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
96 if (sp < gd->bd->bi_dram[bank].start)
97 continue;
98 bank_end = gd->bd->bi_dram[bank].start +
99 gd->bd->bi_dram[bank].size;
100 if (sp >= bank_end)
101 continue;
102 lmb_reserve(lmb, sp, bank_end - sp);
103 break;
104 }
105 }
106