gpmc-omap.h
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/*
* OMAP GPMC Platform data
*
* Copyright (C) 2014 Texas Instruments, Inc. - http://www.ti.com
* Roger Quadros <rogerq@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#ifndef _GPMC_OMAP_H_
#define _GPMC_OMAP_H_
/* Maximum Number of Chip Selects */
#define GPMC_CS_NUM 8
/* bool type time settings */
struct gpmc_bool_timings {
bool cycle2cyclediffcsen;
bool cycle2cyclesamecsen;
bool we_extra_delay;
bool oe_extra_delay;
bool adv_extra_delay;
bool cs_extra_delay;
bool time_para_granularity;
};
/*
* Note that all values in this struct are in nanoseconds except sync_clk
* (which is in picoseconds), while the register values are in gpmc_fck cycles.
*/
struct gpmc_timings {
/* Minimum clock period for synchronous mode (in picoseconds) */
u32 sync_clk;
/* Chip-select signal timings corresponding to GPMC_CS_CONFIG2 */
u32 cs_on; /* Assertion time */
u32 cs_rd_off; /* Read deassertion time */
u32 cs_wr_off; /* Write deassertion time */
/* ADV signal timings corresponding to GPMC_CONFIG3 */
u32 adv_on; /* Assertion time */
u32 adv_rd_off; /* Read deassertion time */
u32 adv_wr_off; /* Write deassertion time */
/* WE signals timings corresponding to GPMC_CONFIG4 */
u32 we_on; /* WE assertion time */
u32 we_off; /* WE deassertion time */
/* OE signals timings corresponding to GPMC_CONFIG4 */
u32 oe_on; /* OE assertion time */
u32 oe_off; /* OE deassertion time */
/* Access time and cycle time timings corresponding to GPMC_CONFIG5 */
u32 page_burst_access; /* Multiple access word delay */
u32 access; /* Start-cycle to first data valid delay */
u32 rd_cycle; /* Total read cycle time */
u32 wr_cycle; /* Total write cycle time */
u32 bus_turnaround;
u32 cycle2cycle_delay;
u32 wait_monitoring;
u32 clk_activation;
/* The following are only on OMAP3430 */
u32 wr_access; /* WRACCESSTIME */
u32 wr_data_mux_bus; /* WRDATAONADMUXBUS */
struct gpmc_bool_timings bool_timings;
};
/* Device timings in picoseconds */
struct gpmc_device_timings {
u32 t_ceasu; /* address setup to CS valid */
u32 t_avdasu; /* address setup to ADV valid */
/* XXX: try to combine t_avdp_r & t_avdp_w. Issue is
* of tusb using these timings even for sync whilst
* ideally for adv_rd/(wr)_off it should have considered
* t_avdh instead. This indirectly necessitates r/w
* variations of t_avdp as it is possible to have one
* sync & other async
*/
u32 t_avdp_r; /* ADV low time (what about t_cer ?) */
u32 t_avdp_w;
u32 t_aavdh; /* address hold time */
u32 t_oeasu; /* address setup to OE valid */
u32 t_aa; /* access time from ADV assertion */
u32 t_iaa; /* initial access time */
u32 t_oe; /* access time from OE assertion */
u32 t_ce; /* access time from CS asertion */
u32 t_rd_cycle; /* read cycle time */
u32 t_cez_r; /* read CS deassertion to high Z */
u32 t_cez_w; /* write CS deassertion to high Z */
u32 t_oez; /* OE deassertion to high Z */
u32 t_weasu; /* address setup to WE valid */
u32 t_wpl; /* write assertion time */
u32 t_wph; /* write deassertion time */
u32 t_wr_cycle; /* write cycle time */
u32 clk;
u32 t_bacc; /* burst access valid clock to output delay */
u32 t_ces; /* CS setup time to clk */
u32 t_avds; /* ADV setup time to clk */
u32 t_avdh; /* ADV hold time from clk */
u32 t_ach; /* address hold time from clk */
u32 t_rdyo; /* clk to ready valid */
u32 t_ce_rdyz; /* XXX: description ?, or use t_cez instead */
u32 t_ce_avd; /* CS on to ADV on delay */
/* XXX: check the possibility of combining
* cyc_aavhd_oe & cyc_aavdh_we
*/
u8 cyc_aavdh_oe;/* read address hold time in cycles */
u8 cyc_aavdh_we;/* write address hold time in cycles */
u8 cyc_oe; /* access time from OE assertion in cycles */
u8 cyc_wpl; /* write deassertion time in cycles */
u32 cyc_iaa; /* initial access time in cycles */
/* extra delays */
bool ce_xdelay;
bool avd_xdelay;
bool oe_xdelay;
bool we_xdelay;
};
#define GPMC_BURST_4 4 /* 4 word burst */
#define GPMC_BURST_8 8 /* 8 word burst */
#define GPMC_BURST_16 16 /* 16 word burst */
#define GPMC_DEVWIDTH_8BIT 1 /* 8-bit device width */
#define GPMC_DEVWIDTH_16BIT 2 /* 16-bit device width */
#define GPMC_MUX_AAD 1 /* Addr-Addr-Data multiplex */
#define GPMC_MUX_AD 2 /* Addr-Data multiplex */
struct gpmc_settings {
bool burst_wrap; /* enables wrap bursting */
bool burst_read; /* enables read page/burst mode */
bool burst_write; /* enables write page/burst mode */
bool device_nand; /* device is NAND */
bool sync_read; /* enables synchronous reads */
bool sync_write; /* enables synchronous writes */
bool wait_on_read; /* monitor wait on reads */
bool wait_on_write; /* monitor wait on writes */
u32 burst_len; /* page/burst length */
u32 device_width; /* device bus width (8 or 16 bit) */
u32 mux_add_data; /* multiplex address & data */
u32 wait_pin; /* wait-pin to be used */
};
/* Data for each chip select */
struct gpmc_omap_cs_data {
bool valid; /* data is valid */
bool is_nand; /* device within this CS is NAND */
struct gpmc_settings *settings;
struct gpmc_device_timings *device_timings;
struct gpmc_timings *gpmc_timings;
struct platform_device *pdev; /* device within this CS region */
unsigned pdata_size;
};
struct gpmc_omap_platform_data {
struct gpmc_omap_cs_data cs[GPMC_CS_NUM];
};
#endif /* _GPMC_OMAP_H */