diff options
| -rw-r--r-- | drivers/memory/omap-gpmc.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c index 92898687181c..6a35971cb724 100644 --- a/drivers/memory/omap-gpmc.c +++ b/drivers/memory/omap-gpmc.c @@ -346,32 +346,50 @@ static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p) } #ifdef DEBUG +/** + * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it. + * @cs: Chip Select Region + * @reg: GPMC_CS_CONFIGn register offset. + * @st_bit: Start Bit + * @end_bit: End Bit. Must be >= @st_bit. + * @name: DTS node name, w/o "gpmc," + * @raw: Raw Format Option. + * raw format: gpmc,name = <value> + * tick format: gpmc,name = <value> /‍* x ns -- y ns; x ticks *‍/ + * Where x ns -- y ns result in the same tick value. + * @noval: Parameter values equal to 0 are not printed. + * @shift: Parameter value left shifts @shift, which is then printed instead of value. + * @return: Specified timing parameter (after optional @shift). + * + */ static int get_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, bool raw, bool noval, int shift, const char *name) { u32 l; - int nr_bits, max_value, mask; + int nr_bits; + int mask; l = gpmc_cs_read_reg(cs, reg); nr_bits = end_bit - st_bit + 1; - max_value = (1 << nr_bits) - 1; - mask = max_value << st_bit; - l = (l & mask) >> st_bit; + mask = (1 << nr_bits) - 1; + l = (l >> st_bit) & mask; if (shift) l = (shift << l); if (noval && (l == 0)) return 0; if (!raw) { - unsigned int time_ns_min, time_ns, time_ns_max; + /* DTS tick format for timings in ns */ + unsigned int time_ns; + unsigned int time_ns_min = 0; - time_ns_min = gpmc_ticks_to_ns(l ? l - 1 : 0); + if (l) + time_ns_min = gpmc_ticks_to_ns(l - 1) + 1; time_ns = gpmc_ticks_to_ns(l); - time_ns_max = gpmc_ticks_to_ns(l + 1 > max_value ? - max_value : l + 1); - pr_info("gpmc,%s = <%u> (%u - %u ns, %i ticks)\n", - name, time_ns, time_ns_min, time_ns_max, l); + pr_info("gpmc,%s = <%u> /* %u ns - %u ns; %i ticks */\n", + name, time_ns, time_ns_min, time_ns, l); } else { + /* raw format */ pr_info("gpmc,%s = <%u>\n", name, l); } |