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Date: Wed, 25 Feb 2015 12:44:15 +0200
From: Roger Quadros <rogerq@...com>
To: Robert ABEL <rabel@...-ec.uni-bielefeld.de>,
<linux-omap@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <tony@...mide.com>,
<linux@....linux.org.uk>
Subject: Re: [PATCH 9/8 v2] ARM OMAP2+ GPMC: fix programming/showing reserved
timing parameters
Robert,
On 24/02/15 22:05, Robert ABEL wrote:
> GPMC_CONFIG1_i parameters CLKACTIVATIONTIME and WAITMONITORINGTIME
> have reserved values.
> Raise an error if calculated timings try to program reserved values.
>
> GPMC_CONFIG1_i ATTCHEDDEVICEPAGELENGTH and DEVICESIZE were already checked
typo ATTCHEDDEVICEPAGELENGTH->ATTACHEDDEVICEPAGELENGTH
> when parsing the DT.
>
> Explicitly comment invalid values on gpmc_cs_show_timings for
> -CLKACTIVATIONTIME
> -WAITMONITORINGTIME
> -DEVICESIZE
> -ATTACHEDDEVICEPAGELENGTH
>
> Signed-off-by: Robert ABEL <rabel@...-ec.uni-bielefeld.de>
> ---
> drivers/memory/omap-gpmc.c | 69 ++++++++++++++++++++++++++++++----------------
> 1 file changed, 46 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
> index 6591991..cc2e6d0 100644
> --- a/drivers/memory/omap-gpmc.c
> +++ b/drivers/memory/omap-gpmc.c
> @@ -135,6 +135,8 @@
> #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)
> #define GPMC_CONFIG1_WAIT_READ_MON (1 << 22)
> #define GPMC_CONFIG1_WAIT_WRITE_MON (1 << 21)
> @@ -144,6 +146,8 @@
> #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 GPMC_CONFIG1_DEVICESIZE_16
Shouldn't this be 1 instead? I'm hoping max value is without the shift
based on GPMC_CONFIG1_CLKACTIVATIONTIME_MAX.
> #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)
> @@ -394,18 +398,21 @@ 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.
> + * @max Maximum parameter value (after optional @shift).
max should be absolute value, without the 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.
> * @raw Raw Format Option.
> * raw format: gpmc,name = <value>
> * tick format: gpmc,name = <value> /‍* x ticks *‍/
> + * When @max is exceeded, "invalid" is printed inside comment.
> * @noval Parameter values equal to 0 are not printed.
> *
> */
> 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,
> @@ -415,11 +422,15 @@ 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))
> @@ -429,11 +440,11 @@ static int get_gpmc_timing_reg(
> unsigned int time_ns;
>
> time_ns = gpmc_clk_ticks_to_ns(l, cs, cd);
> - pr_info("gpmc,%s = <%u> /* %i ticks */\n",
> - name, time_ns, l);
> + pr_info("gpmc,%s = <%u> /* %i ticks %s*/\n",
> + name, 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;
> @@ -443,15 +454,19 @@ 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(reg, st, end, shift, max, field) \
> + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, (shift), 1, 1)
Is it better to rename this to GPMC_GET_RAW_SHIFT_MAX() as it takes the max parameter.
> #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)
> {
> @@ -475,11 +490,11 @@ 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(GPMC_CS_CONFIG1, 23, 24, 4, 2, "burst-length");
want to define GPMC_CONFIG1_BURSTLENGTH_MAX?
> 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");
> @@ -519,8 +534,8 @@ 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_WAIT_MON_TIME_MAX, "wait-monitoring-ns", GPMC_CD_CLK);
use GPMC_CONFIG1_WAITMONTIME_MAX to have consistent naming.
> + 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");
> @@ -537,13 +552,15 @@ 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.
> * @note Caller is expected to have initialized CONFIG1 GPMCFCLKDIVIDER
> * prior to calling this function with @cd equal to GPMC_CD_CLK.
> */
> -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;
> @@ -556,9 +573,12 @@ 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;
> }
> @@ -577,13 +597,16 @@ 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_CD(reg, st, end, field, cd) \
> + GPMC_SET_ONE_CD_MAX(reg, st, end, 0, field, GPMC_CD_FCLK)
last parameter should be (cd) instead of GPMC_CD_FCLK.
> +
> #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
> @@ -702,8 +725,8 @@ int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t, const struct gpmc_
> 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_WAIT_MON_TIME_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
> printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
>
cheers,
-roger
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