LXR linux/include/linux/omap-gpmc.h

   1/*
   2 *  OMAP GPMC (General Purpose Memory Controller) defines
   3 *
   4 *  This program is free software; you can redistribute  it and/or modify it
   5 *  under  the terms of  the GNU General  Public License as published by the
   6 *  Free Software Foundation;  either version 2 of the  License, or (at your
   7 *  option) any later version.
   8 */
   9
  10#include <linux/platform_data/gpmc-omap.h>
  11
  12#define GPMC_CONFIG_WP          0x00000005
  13
  14/* IRQ numbers in GPMC IRQ domain for legacy boot use */
  15#define GPMC_IRQ_FIFOEVENTENABLE        0
  16#define GPMC_IRQ_COUNT_EVENT            1
  17
  18/**
  19 * gpmc_nand_ops - Interface between NAND and GPMC
  20 * @nand_write_buffer_empty: get the NAND write buffer empty status.
  21 */
  22struct gpmc_nand_ops {
  23        bool (*nand_writebuffer_empty)(void);
  24};
  25
  26struct gpmc_nand_regs;
  27
  28struct gpmc_onenand_info {
  29        bool sync_read;
  30        bool sync_write;
  31        int burst_len;
  32};
  33
  34#if IS_ENABLED(CONFIG_OMAP_GPMC)
  35struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
  36                                             int cs);
  37/**
  38 * gpmc_omap_onenand_set_timings - set optimized sync timings.
  39 * @cs:      Chip Select Region
  40 * @freq:    Chip frequency
  41 * @latency: Burst latency cycle count
  42 * @info:    Structure describing parameters used
  43 *
  44 * Sets optimized timings for the @cs region based on @freq and @latency.
  45 * Updates the @info structure based on the GPMC settings.
  46 */
  47int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
  48                                  int latency,
  49                                  struct gpmc_onenand_info *info);
  50
  51#else
  52static inline struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
  53                                                           int cs)
  54{
  55        return NULL;
  56}
  57
  58static inline
  59int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
  60                                  int latency,
  61                                  struct gpmc_onenand_info *info)
  62{
  63        return -EINVAL;
  64}
  65#endif /* CONFIG_OMAP_GPMC */
  66
  67extern int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
  68                             struct gpmc_settings *gpmc_s,
  69                             struct gpmc_device_timings *dev_t);
  70
  71struct device_node;
  72
  73extern int gpmc_get_client_irq(unsigned irq_config);
  74
  75extern unsigned int gpmc_ticks_to_ns(unsigned int ticks);
  76
  77extern void gpmc_cs_write_reg(int cs, int idx, u32 val);
  78extern int gpmc_calc_divider(unsigned int sync_clk);
  79extern int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t,
  80                               const struct gpmc_settings *s);
  81extern int gpmc_cs_program_settings(int cs, struct gpmc_settings *p);
  82extern int gpmc_cs_request(int cs, unsigned long size, unsigned long *base);
  83extern void gpmc_cs_free(int cs);
  84extern int gpmc_configure(int cmd, int wval);
  85extern void gpmc_read_settings_dt(struct device_node *np,
  86                                  struct gpmc_settings *p);
  87
  88extern void omap3_gpmc_save_context(void);
  89extern void omap3_gpmc_restore_context(void);
  90
  91struct gpmc_timings;
  92struct omap_nand_platform_data;
  93struct omap_onenand_platform_data;
  94
  95#if IS_ENABLED(CONFIG_MTD_ONENAND_OMAP2)
  96extern int gpmc_onenand_init(struct omap_onenand_platform_data *d);
  97#else
  98#define board_onenand_data      NULL
  99static inline int gpmc_onenand_init(struct omap_onenand_platform_data *d)
 100{
 101        return 0;
 102}
 103#endif
 104