diff options
author | Robert ABEL <rabel@cit-ec.uni-bielefeld.de> | 2015-02-27 16:56:55 +0100 |
---|---|---|
committer | Roger Quadros <rogerq@ti.com> | 2015-03-06 12:55:32 +0200 |
commit | 4b613e9b4bbe94545a588a100e09006d827a7ebe (patch) | |
tree | c948cde4f4ad27625865f3c3cebf0da5309dd2f5 /drivers/memory/omap-gpmc.c | |
parent | 7f2e8c58ae9e35240e5924c63163c07a506d0d12 (diff) | |
download | linux-4b613e9b4bbe94545a588a100e09006d827a7ebe.tar.bz2 |
ARM OMAP2+ GPMC: fix programming/showing reserved timing parameters
GPMC_CONFIG1_i parameters CLKACTIVATIONTIME and WAITMONITORINGTIME
have reserved values.
Raise an error if calculated timings try to program reserved values.
GPMC_CONFIG1_i ATTACHEDDEVICEPAGELENGTH and DEVICESIZE were already checked
when parsing the DT.
Explicitly comment invalid values on gpmc_cs_show_timings for
-CLKACTIVATIONTIME
-WAITMONITORINGTIME
-DEVICESIZE
-ATTACHEDDEVICEPAGELENGTH
Signed-off-by: Robert ABEL <rabel@cit-ec.uni-bielefeld.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Diffstat (limited to 'drivers/memory/omap-gpmc.c')
-rw-r--r-- | drivers/memory/omap-gpmc.c | 81 |
1 files changed, 58 insertions, 23 deletions
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c index 6c076b7c9b6f..c94ea0d68746 100644 --- a/drivers/memory/omap-gpmc.c +++ b/drivers/memory/omap-gpmc.c @@ -135,7 +135,11 @@ #define GPMC_CONFIG1_WRITETYPE_ASYNC (0 << 27) #define GPMC_CONFIG1_WRITETYPE_SYNC (1 << 27) #define GPMC_CONFIG1_CLKACTIVATIONTIME(val) ((val & 3) << 25) +/** CLKACTIVATIONTIME Max Ticks */ +#define GPMC_CONFIG1_CLKACTIVATIONTIME_MAX 2 #define GPMC_CONFIG1_PAGE_LEN(val) ((val & 3) << 23) +/** ATTACHEDDEVICEPAGELENGTH Max Value */ +#define GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX 2 #define GPMC_CONFIG1_WAIT_READ_MON (1 << 22) #define GPMC_CONFIG1_WAIT_WRITE_MON (1 << 21) #define GPMC_CONFIG1_WAIT_MON_TIME(val) ((val & 3) << 18) @@ -144,6 +148,8 @@ #define GPMC_CONFIG1_WAIT_PIN_SEL(val) ((val & 3) << 16) #define GPMC_CONFIG1_DEVICESIZE(val) ((val & 3) << 12) #define GPMC_CONFIG1_DEVICESIZE_16 GPMC_CONFIG1_DEVICESIZE(1) +/** DEVICESIZE Max Value */ +#define GPMC_CONFIG1_DEVICESIZE_MAX 1 #define GPMC_CONFIG1_DEVICETYPE(val) ((val & 3) << 10) #define GPMC_CONFIG1_DEVICETYPE_NOR GPMC_CONFIG1_DEVICETYPE(0) #define GPMC_CONFIG1_MUXTYPE(val) ((val & 3) << 8) @@ -404,6 +410,8 @@ static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p) * @reg: GPMC_CS_CONFIGn register offset. * @st_bit: Start Bit * @end_bit: End Bit. Must be >= @st_bit. + * @ma:x Maximum parameter value (before optional @shift). + * If 0, maximum is as high as @st_bit and @end_bit allow. * @name: DTS node name, w/o "gpmc," * @cd: Clock Domain of timing parameter. * @shift: Parameter value left shifts @shift, which is then printed instead of value. @@ -411,13 +419,14 @@ static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p) * 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. + * When @max is exceeded, "invalid" is printed inside comment. * @noval: Parameter values equal to 0 are not printed. * @return: Specified timing parameter (after optional @shift). * */ static int get_gpmc_timing_reg( /* timing specifiers */ - int cs, int reg, int st_bit, int end_bit, + int cs, int reg, int st_bit, int end_bit, int max, const char *name, const enum gpmc_clk_domain cd, /* value transform */ int shift, @@ -427,11 +436,15 @@ static int get_gpmc_timing_reg( u32 l; int nr_bits; int mask; + bool invalid; l = gpmc_cs_read_reg(cs, reg); nr_bits = end_bit - st_bit + 1; mask = (1 << nr_bits) - 1; l = (l >> st_bit) & mask; + if (!max) + max = mask; + invalid = l > max; if (shift) l = (shift << l); if (noval && (l == 0)) @@ -444,11 +457,13 @@ static int get_gpmc_timing_reg( if (l) time_ns_min = gpmc_clk_ticks_to_ns(l - 1, cs, cd) + 1; time_ns = gpmc_clk_ticks_to_ns(l, cs, cd); - pr_info("gpmc,%s = <%u> /* %u ns - %u ns; %i ticks */\n", - name, time_ns, time_ns_min, time_ns, l); + pr_info("gpmc,%s = <%u> /* %u ns - %u ns; %i ticks%s*/\n", + name, time_ns, time_ns_min, time_ns, l, + invalid ? "; invalid " : " "); } else { /* raw format */ - pr_info("gpmc,%s = <%u>\n", name, l); + pr_info("gpmc,%s = <%u>%s\n", name, l, + invalid ? " /* invalid */" : ""); } return l; @@ -458,15 +473,19 @@ static int get_gpmc_timing_reg( pr_info("cs%i %s: 0x%08x\n", cs, #config, \ gpmc_cs_read_reg(cs, config)) #define GPMC_GET_RAW(reg, st, end, field) \ - get_gpmc_timing_reg(cs, (reg), (st), (end), field, GPMC_CD_FCLK, 0, 1, 0) + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 0) +#define GPMC_GET_RAW_MAX(reg, st, end, max, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, 0, 1, 0) #define GPMC_GET_RAW_BOOL(reg, st, end, field) \ - get_gpmc_timing_reg(cs, (reg), (st), (end), field, GPMC_CD_FCLK, 0, 1, 1) -#define GPMC_GET_RAW_SHIFT(reg, st, end, shift, field) \ - get_gpmc_timing_reg(cs, (reg), (st), (end), field, GPMC_CD_FCLK, (shift), 1, 1) + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 1) +#define GPMC_GET_RAW_SHIFT_MAX(reg, st, end, shift, max, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, (shift), 1, 1) #define GPMC_GET_TICKS(reg, st, end, field) \ - get_gpmc_timing_reg(cs, (reg), (st), (end), field, GPMC_CD_FCLK, 0, 0, 0) + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 0, 0) #define GPMC_GET_TICKS_CD(reg, st, end, field, cd) \ - get_gpmc_timing_reg(cs, (reg), (st), (end), field, (cd), 0, 0, 0) + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, (cd), 0, 0, 0) +#define GPMC_GET_TICKS_CD_MAX(reg, st, end, max, field, cd) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, (cd), 0, 0, 0) static void gpmc_show_regs(int cs, const char *desc) { @@ -490,11 +509,14 @@ static void gpmc_cs_show_timings(int cs, const char *desc) pr_info("gpmc cs%i access configuration:\n", cs); GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 4, 4, "time-para-granularity"); GPMC_GET_RAW(GPMC_CS_CONFIG1, 8, 9, "mux-add-data"); - GPMC_GET_RAW(GPMC_CS_CONFIG1, 12, 13, "device-width"); + GPMC_GET_RAW_MAX(GPMC_CS_CONFIG1, 12, 13, + GPMC_CONFIG1_DEVICESIZE_MAX, "device-width"); GPMC_GET_RAW(GPMC_CS_CONFIG1, 16, 17, "wait-pin"); GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 21, 21, "wait-on-write"); GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 22, 22, "wait-on-read"); - GPMC_GET_RAW_SHIFT(GPMC_CS_CONFIG1, 23, 24, 4, "burst-length"); + GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 23, 24, 4, + GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX, + "burst-length"); GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 27, 27, "sync-write"); GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 28, 28, "burst-write"); GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 29, 29, "gpmc,sync-read"); @@ -534,8 +556,12 @@ static void gpmc_cs_show_timings(int cs, const char *desc) GPMC_GET_TICKS(GPMC_CS_CONFIG6, 0, 3, "bus-turnaround-ns"); GPMC_GET_TICKS(GPMC_CS_CONFIG6, 8, 11, "cycle2cycle-delay-ns"); - GPMC_GET_TICKS_CD(GPMC_CS_CONFIG1, 18, 19, "wait-monitoring-ns", GPMC_CD_CLK); - GPMC_GET_TICKS(GPMC_CS_CONFIG1, 25, 26, "clk-activation-ns"); + GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 18, 19, + GPMC_CONFIG1_WAITMONITORINGTIME_MAX, + "wait-monitoring-ns", GPMC_CD_CLK); + GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 25, 26, + GPMC_CONFIG1_CLKACTIVATIONTIME_MAX, + "clk-activation-ns", GPMC_CD_FCLK); GPMC_GET_TICKS(GPMC_CS_CONFIG6, 16, 19, "wr-data-mux-bus-ns"); GPMC_GET_TICKS(GPMC_CS_CONFIG6, 24, 28, "wr-access-ns"); @@ -555,12 +581,14 @@ static inline void gpmc_cs_show_timings(int cs, const char *desc) * @reg: GPMC_CS_CONFIGn register offset. * @st_bit: Start Bit * @end_bit: End Bit. Must be >= @st_bit. + * @max: Maximum parameter value. + * If 0, maximum is as high as @st_bit and @end_bit allow. * @time: Timing parameter in ns. * @cd: Timing parameter clock domain. * @name: Timing parameter name. * @return: 0 on success, -1 on error. */ -static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, +static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, int max, int time, enum gpmc_clk_domain cd, const char *name) { u32 l; @@ -573,9 +601,12 @@ static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, nr_bits = end_bit - st_bit + 1; mask = (1 << nr_bits) - 1; - if (ticks > mask) { + if (!max) + max = mask; + + if (ticks > max) { pr_err("%s: GPMC CS%d: %s %d ns, %d ticks > %d ticks\n", - __func__, cs, name, time, ticks, mask); + __func__, cs, name, time, ticks, max); return -1; } @@ -594,13 +625,13 @@ static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, return 0; } -#define GPMC_SET_ONE_CD(reg, st, end, field, cd) \ - if (set_gpmc_timing_reg(cs, (reg), (st), (end), \ - t->field, (cd), #field) < 0) \ +#define GPMC_SET_ONE_CD_MAX(reg, st, end, max, field, cd) \ + if (set_gpmc_timing_reg(cs, (reg), (st), (end), (max), \ + t->field, (cd), #field) < 0) \ return -1 #define GPMC_SET_ONE(reg, st, end, field) \ - GPMC_SET_ONE_CD(reg, st, end, field, GPMC_CD_FCLK) + GPMC_SET_ONE_CD_MAX(reg, st, end, 0, field, GPMC_CD_FCLK) /** * gpmc_calc_waitmonitoring_divider - calculate proper GPMCFCLKDIVIDER based on WAITMONITORINGTIME @@ -729,8 +760,12 @@ int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t, l |= (div - 1); gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l); - GPMC_SET_ONE_CD(GPMC_CS_CONFIG1, 18, 19, wait_monitoring, GPMC_CD_CLK); - GPMC_SET_ONE(GPMC_CS_CONFIG1, 25, 26, clk_activation); + GPMC_SET_ONE_CD_MAX(GPMC_CS_CONFIG1, 18, 19, + GPMC_CONFIG1_WAITMONITORINGTIME_MAX, + wait_monitoring, GPMC_CD_CLK); + GPMC_SET_ONE_CD_MAX(GPMC_CS_CONFIG1, 25, 26, + GPMC_CONFIG1_CLKACTIVATIONTIME_MAX, + clk_activation, GPMC_CD_FCLK); #ifdef DEBUG pr_info("GPMC CS%d CLK period is %lu ns (div %d)\n", |