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  */
  22 struct gpmc_nand_ops {
  23         bool (*nand_writebuffer_empty)(void);
  24 };
  25
  26 struct gpmc_nand_regs;
  27
  28 struct gpmc_onenand_info {
  29         bool sync_read;
  30         bool sync_write;
  31         int burst_len;
  32 };
  33
  34 #if IS_ENABLED(CONFIG_OMAP_GPMC)
  35 struct 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  */
  47 int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
  48                                   int latency,
  49                                   struct gpmc_onenand_info *info);
  50
  51 #else
  52 static inline struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *regs,
  53                                                            int cs)
  54 {
  55         return NULL;
  56 }
  57
  58 static inline
  59 int 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
  67 extern int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
  68                              struct gpmc_settings *gpmc_s,
  69                              struct gpmc_device_timings *dev_t);
  70
  71 struct device_node;
  72
  73 extern int gpmc_get_client_irq(unsigned irq_config);
  74
  75 extern unsigned int gpmc_ticks_to_ns(unsigned int ticks);
  76
  77 extern void gpmc_cs_write_reg(int cs, int idx, u32 val);
  78 extern int gpmc_calc_divider(unsigned int sync_clk);
  79 extern int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t,
  80                                const struct gpmc_settings *s);
  81 extern int gpmc_cs_program_settings(int cs, struct gpmc_settings *p);
  82 extern int gpmc_cs_request(int cs, unsigned long size, unsigned long *base);
  83 extern void gpmc_cs_free(int cs);
  84 extern int gpmc_configure(int cmd, int wval);
  85 extern void gpmc_read_settings_dt(struct device_node *np,
  86                                   struct gpmc_settings *p);
  87
  88 extern void omap3_gpmc_save_context(void);
  89 extern void omap3_gpmc_restore_context(void);
  90
  91 struct gpmc_timings;
  92 struct omap_nand_platform_data;
  93 struct omap_onenand_platform_data;
  94
  95 #if IS_ENABLED(CONFIG_MTD_ONENAND_OMAP2)
  96 extern int gpmc_onenand_init(struct omap_onenand_platform_data *d);
  97 #else
  98 #define board_onenand_data      NULL
  99 static inline int gpmc_onenand_init(struct omap_onenand_platform_data *d)
 100 {
 101         return 0;
 102 }
 103 #endif