xref: /openbmc/u-boot/drivers/memory/ti-aemif.c (revision e8f80a5a)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Keystone2: Asynchronous EMIF Configuration
4  *
5  * (C) Copyright 2012-2014
6  *     Texas Instruments Incorporated, <www.ti.com>
7  */
8 
9 #include <common.h>
10 #include <asm/ti-common/ti-aemif.h>
11 
12 #define AEMIF_WAITCYCLE_CONFIG		(CONFIG_AEMIF_CNTRL_BASE + 0x4)
13 #define AEMIF_NAND_CONTROL		(CONFIG_AEMIF_CNTRL_BASE + 0x60)
14 #define AEMIF_ONENAND_CONTROL		(CONFIG_AEMIF_CNTRL_BASE + 0x5c)
15 #define AEMIF_CONFIG(cs)		(CONFIG_AEMIF_CNTRL_BASE + 0x10 \
16 					 + (cs * 4))
17 
18 #define AEMIF_CFG_SELECT_STROBE(v)	((v) ? 1 << 31 : 0)
19 #define AEMIF_CFG_EXTEND_WAIT(v)	((v) ? 1 << 30 : 0)
20 #define AEMIF_CFG_WR_SETUP(v)		(((v) & 0x0f) << 26)
21 #define AEMIF_CFG_WR_STROBE(v)		(((v) & 0x3f) << 20)
22 #define AEMIF_CFG_WR_HOLD(v)		(((v) & 0x07) << 17)
23 #define AEMIF_CFG_RD_SETUP(v)		(((v) & 0x0f) << 13)
24 #define AEMIF_CFG_RD_STROBE(v)		(((v) & 0x3f) << 7)
25 #define AEMIF_CFG_RD_HOLD(v)		(((v) & 0x07) << 4)
26 #define AEMIF_CFG_TURN_AROUND(v)	(((v) & 0x03) << 2)
27 #define AEMIF_CFG_WIDTH(v)		(((v) & 0x03) << 0)
28 
29 #define set_config_field(reg, field, val)			\
30 	do {							\
31 		if (val != -1) {				\
32 			reg &= ~AEMIF_CFG_##field(0xffffffff);	\
33 			reg |=	AEMIF_CFG_##field(val);		\
34 		}						\
35 	} while (0)
36 
aemif_configure(int cs,struct aemif_config * cfg)37 static void aemif_configure(int cs, struct aemif_config *cfg)
38 {
39 	unsigned long tmp;
40 
41 	if (cfg->mode == AEMIF_MODE_NAND) {
42 		tmp = __raw_readl(AEMIF_NAND_CONTROL);
43 		tmp |= (1 << cs);
44 		__raw_writel(tmp, AEMIF_NAND_CONTROL);
45 
46 	} else if (cfg->mode == AEMIF_MODE_ONENAND) {
47 		tmp = __raw_readl(AEMIF_ONENAND_CONTROL);
48 		tmp |= (1 << cs);
49 		__raw_writel(tmp, AEMIF_ONENAND_CONTROL);
50 	}
51 
52 	tmp = __raw_readl(AEMIF_CONFIG(cs));
53 
54 	set_config_field(tmp, SELECT_STROBE,	cfg->select_strobe);
55 	set_config_field(tmp, EXTEND_WAIT,	cfg->extend_wait);
56 	set_config_field(tmp, WR_SETUP,		cfg->wr_setup);
57 	set_config_field(tmp, WR_STROBE,	cfg->wr_strobe);
58 	set_config_field(tmp, WR_HOLD,		cfg->wr_hold);
59 	set_config_field(tmp, RD_SETUP,		cfg->rd_setup);
60 	set_config_field(tmp, RD_STROBE,	cfg->rd_strobe);
61 	set_config_field(tmp, RD_HOLD,		cfg->rd_hold);
62 	set_config_field(tmp, TURN_AROUND,	cfg->turn_around);
63 	set_config_field(tmp, WIDTH,		cfg->width);
64 
65 	__raw_writel(tmp, AEMIF_CONFIG(cs));
66 }
67 
aemif_init(int num_cs,struct aemif_config * config)68 void aemif_init(int num_cs, struct aemif_config *config)
69 {
70 	int cs;
71 
72 	if (num_cs > AEMIF_NUM_CS) {
73 		num_cs = AEMIF_NUM_CS;
74 		printf("AEMIF: csnum has to be <= 5");
75 	}
76 
77 	for (cs = 0; cs < num_cs; cs++)
78 		aemif_configure(cs, config + cs);
79 }
80