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/arch/hardware.h>
11#include <asm/ti-common/ti-aemif.h>
12
13#define AEMIF_WAITCYCLE_CONFIG		(KS2_AEMIF_CNTRL_BASE + 0x4)
14#define AEMIF_NAND_CONTROL		(KS2_AEMIF_CNTRL_BASE + 0x60)
15#define AEMIF_ONENAND_CONTROL		(KS2_AEMIF_CNTRL_BASE + 0x5c)
16#define AEMIF_CONFIG(cs)		(KS2_AEMIF_CNTRL_BASE + 0x10 + (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
37static 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
68void 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