omap-gpmc.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 *  OMAP GPMC (General Purpose Memory Controller) defines
 4 */
 5
 6#include <linux/platform_data/gpmc-omap.h>
 7
 8#define GPMC_CONFIG_WP		0x00000005
 9
10/* IRQ numbers in GPMC IRQ domain for legacy boot use */
11#define GPMC_IRQ_FIFOEVENTENABLE	0
12#define GPMC_IRQ_COUNT_EVENT		1
13
14/**
15 * gpmc_nand_ops - Interface between NAND and GPMC
16 * @nand_write_buffer_empty: get the NAND write buffer empty status.
17 */
18struct gpmc_nand_ops {
19	bool (*nand_writebuffer_empty)(void);
20};
21
22struct gpmc_nand_regs;
23
24struct gpmc_onenand_info {
25	bool sync_read;
26	bool sync_write;
27	int burst_len;
28};
29
30#if IS_ENABLED(CONFIG_OMAP_GPMC)
31struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
32					     int cs);
33/**
34 * gpmc_omap_onenand_set_timings - set optimized sync timings.
35 * @cs:      Chip Select Region
36 * @freq:    Chip frequency
37 * @latency: Burst latency cycle count
38 * @info:    Structure describing parameters used
39 *
40 * Sets optimized timings for the @cs region based on @freq and @latency.
41 * Updates the @info structure based on the GPMC settings.
42 */
43int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
44				  int latency,
45				  struct gpmc_onenand_info *info);
46
47#else
48static inline struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
49							   int cs)
50{
51	return NULL;
52}
53
54static inline
55int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
56				  int latency,
57				  struct gpmc_onenand_info *info)
58{
59	return -EINVAL;
60}
61#endif /* CONFIG_OMAP_GPMC */
62
63extern int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
64			     struct gpmc_settings *gpmc_s,
65			     struct gpmc_device_timings *dev_t);
66
67struct device_node;
68
69extern void gpmc_cs_write_reg(int cs, int idx, u32 val);
70extern int gpmc_calc_divider(unsigned int sync_clk);
71extern int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t,
72			       const struct gpmc_settings *s);
73extern int gpmc_cs_program_settings(int cs, struct gpmc_settings *p);
74extern int gpmc_cs_request(int cs, unsigned long size, unsigned long *base);
75extern void gpmc_cs_free(int cs);
76extern int gpmc_configure(int cmd, int wval);
77extern void gpmc_read_settings_dt(struct device_node *np,
78				  struct gpmc_settings *p);
79
80struct gpmc_timings;
81struct omap_nand_platform_data;
82struct omap_onenand_platform_data;