diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c | 605 | ||||
| -rw-r--r-- | drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 40 | ||||
| -rw-r--r-- | drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h | 103 | ||||
| -rw-r--r-- | drivers/mtd/nand/raw/gpmi-nand/gpmi-regs.h | 5 |
4 files changed, 98 insertions, 655 deletions
diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c index cf71cb9cee6a..e94556705dc7 100644 --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c @@ -26,15 +26,8 @@ #include "gpmi-regs.h" #include "bch-regs.h" -static struct timing_threshold timing_default_threshold = { - .max_data_setup_cycles = (BM_GPMI_TIMING0_DATA_SETUP >> - BP_GPMI_TIMING0_DATA_SETUP), - .internal_data_setup_in_ns = 0, - .max_sample_delay_factor = (BM_GPMI_CTRL1_RDN_DELAY >> - BP_GPMI_CTRL1_RDN_DELAY), - .max_dll_clock_period_in_ns = 32, - .max_dll_delay_in_ns = 16, -}; +/* Converts time to clock cycles */ +#define TO_CYCLES(duration, period) DIV_ROUND_UP_ULL(duration, period) #define MXS_SET_ADDR 0x4 #define MXS_CLR_ADDR 0x8 @@ -181,7 +174,6 @@ int gpmi_init(struct gpmi_nand_data *this) if (ret) goto err_out; - /* Choose NAND mode. */ writel(BM_GPMI_CTRL1_GPMI_MODE, r->gpmi_regs + HW_GPMI_CTRL1_CLR); @@ -320,399 +312,6 @@ err_out: return ret; } -/* Converts time in nanoseconds to cycles. */ -static unsigned int ns_to_cycles(unsigned int time, - unsigned int period, unsigned int min) -{ - unsigned int k; - - k = (time + period - 1) / period; - return max(k, min); -} - -#define DEF_MIN_PROP_DELAY 5 -#define DEF_MAX_PROP_DELAY 9 -/* Apply timing to current hardware conditions. */ -static void -gpmi_nfc_compute_hardware_timings(struct gpmi_nand_data *this) -{ - struct gpmi_nfc_hardware_timing *hw = &this->hw; - struct timing_threshold *nfc = &timing_default_threshold; - struct nand_chip *nand = &this->nand; - struct nand_timing target = this->timing; - unsigned long clock_frequency_in_hz; - unsigned int clock_period_in_ns; - bool dll_use_half_periods; - unsigned int dll_delay_shift; - unsigned int max_sample_delay_in_ns; - unsigned int address_setup_in_cycles; - unsigned int data_setup_in_ns; - unsigned int data_setup_in_cycles; - unsigned int data_hold_in_cycles; - int ideal_sample_delay_in_ns; - unsigned int sample_delay_factor; - int tEYE; - unsigned int min_prop_delay_in_ns = DEF_MIN_PROP_DELAY; - unsigned int max_prop_delay_in_ns = DEF_MAX_PROP_DELAY; - - /* Clock rate for non-EDO modes */ - hw->clk_rate = 22000000; - - /* - * If there are multiple chips, we need to relax the timings to allow - * for signal distortion due to higher capacitance. - */ - if (nand->numchips > 2) { - target.data_setup_in_ns += 10; - target.data_hold_in_ns += 10; - target.address_setup_in_ns += 10; - } else if (nand->numchips > 1) { - target.data_setup_in_ns += 5; - target.data_hold_in_ns += 5; - target.address_setup_in_ns += 5; - } - - /* Inspect the clock. */ - nfc->clock_frequency_in_hz = hw->clk_rate; - clock_frequency_in_hz = nfc->clock_frequency_in_hz; - clock_period_in_ns = NSEC_PER_SEC / clock_frequency_in_hz; - - /* - * The NFC quantizes setup and hold parameters in terms of clock cycles. - * Here, we quantize the setup and hold timing parameters to the - * next-highest clock period to make sure we apply at least the - * specified times. - * - * For data setup and data hold, the hardware interprets a value of zero - * as the largest possible delay. This is not what's intended by a zero - * in the input parameter, so we impose a minimum of one cycle. - */ - data_setup_in_cycles = ns_to_cycles(target.data_setup_in_ns, - clock_period_in_ns, 1); - data_hold_in_cycles = ns_to_cycles(target.data_hold_in_ns, - clock_period_in_ns, 1); - address_setup_in_cycles = ns_to_cycles(target.address_setup_in_ns, - clock_period_in_ns, 0); - - /* - * The clock's period affects the sample delay in a number of ways: - * - * (1) The NFC HAL tells us the maximum clock period the sample delay - * DLL can tolerate. If the clock period is greater than half that - * maximum, we must configure the DLL to be driven by half periods. - * - * (2) We need to convert from an ideal sample delay, in ns, to a - * "sample delay factor," which the NFC uses. This factor depends on - * whether we're driving the DLL with full or half periods. - * Paraphrasing the reference manual: - * - * AD = SDF x 0.125 x RP - * - * where: - * - * AD is the applied delay, in ns. - * SDF is the sample delay factor, which is dimensionless. - * RP is the reference period, in ns, which is a full clock period - * if the DLL is being driven by full periods, or half that if - * the DLL is being driven by half periods. - * - * Let's re-arrange this in a way that's more useful to us: - * - * 8 - * SDF = AD x ---- - * RP - * - * The reference period is either the clock period or half that, so this - * is: - * - * 8 AD x DDF - * SDF = AD x ----- = -------- - * f x P P - * - * where: - * - * f is 1 or 1/2, depending on how we're driving the DLL. - * P is the clock period. - * DDF is the DLL Delay Factor, a dimensionless value that - * incorporates all the constants in the conversion. - * - * DDF will be either 8 or 16, both of which are powers of two. We can - * reduce the cost of this conversion by using bit shifts instead of - * multiplication or division. Thus: - * - * AD << DDS - * SDF = --------- - * P - * - * or - * - * AD = (SDF >> DDS) x P - * - * where: - * - * DDS is the DLL Delay Shift, the logarithm to base 2 of the DDF. - */ - if (clock_period_in_ns > (nfc->max_dll_clock_period_in_ns >> 1)) { - dll_use_half_periods = true; - dll_delay_shift = 3 + 1; - } else { - dll_use_half_periods = false; - dll_delay_shift = 3; - } - - /* - * Compute the maximum sample delay the NFC allows, under current - * conditions. If the clock is running too slowly, no sample delay is - * possible. - */ - if (clock_period_in_ns > nfc->max_dll_clock_period_in_ns) - max_sample_delay_in_ns = 0; - else { - /* - * Compute the delay implied by the largest sample delay factor - * the NFC allows. - */ - max_sample_delay_in_ns = - (nfc->max_sample_delay_factor * clock_period_in_ns) >> - dll_delay_shift; - - /* - * Check if the implied sample delay larger than the NFC - * actually allows. - */ - if (max_sample_delay_in_ns > nfc->max_dll_delay_in_ns) - max_sample_delay_in_ns = nfc->max_dll_delay_in_ns; - } - - /* - * Fold the read setup time required by the NFC into the maximum - * propagation delay. - */ - max_prop_delay_in_ns += nfc->internal_data_setup_in_ns; - - /* - * Earlier, we computed the number of clock cycles required to satisfy - * the data setup time. Now, we need to know the actual nanoseconds. - */ - data_setup_in_ns = clock_period_in_ns * data_setup_in_cycles; - - /* - * Compute tEYE, the width of the data eye when reading from the NAND - * Flash. The eye width is fundamentally determined by the data setup - * time, perturbed by propagation delays and some characteristics of the - * NAND Flash device. - * - * start of the eye = max_prop_delay + tREA - * end of the eye = min_prop_delay + tRHOH + data_setup - */ - tEYE = (int)min_prop_delay_in_ns + (int)target.tRHOH_in_ns + - (int)data_setup_in_ns; - - tEYE -= (int)max_prop_delay_in_ns + (int)target.tREA_in_ns; - - /* - * The eye must be open. If it's not, we can try to open it by - * increasing its main forcer, the data setup time. - * - * In each iteration of the following loop, we increase the data setup - * time by a single clock cycle. We do this until either the eye is - * open or we run into NFC limits. - */ - while ((tEYE <= 0) && - (data_setup_in_cycles < nfc->max_data_setup_cycles)) { - /* Give a cycle to data setup. */ - data_setup_in_cycles++; - /* Synchronize the data setup time with the cycles. */ - data_setup_in_ns += clock_period_in_ns; - /* Adjust tEYE accordingly. */ - tEYE += clock_period_in_ns; - } - - /* - * When control arrives here, the eye is open. The ideal time to sample - * the data is in the center of the eye: - * - * end of the eye + start of the eye - * --------------------------------- - data_setup - * 2 - * - * After some algebra, this simplifies to the code immediately below. - */ - ideal_sample_delay_in_ns = - ((int)max_prop_delay_in_ns + - (int)target.tREA_in_ns + - (int)min_prop_delay_in_ns + - (int)target.tRHOH_in_ns - - (int)data_setup_in_ns) >> 1; - - /* - * The following figure illustrates some aspects of a NAND Flash read: - * - * - * __ _____________________________________ - * RDN \_________________/ - * - * <---- tEYE -----> - * /-----------------\ - * Read Data ----------------------------< >--------- - * \-----------------/ - * ^ ^ ^ ^ - * | | | | - * |<--Data Setup -->|<--Delay Time -->| | - * | | | | - * | | | - * | |<-- Quantized Delay Time -->| - * | | | - * - * - * We have some issues we must now address: - * - * (1) The *ideal* sample delay time must not be negative. If it is, we - * jam it to zero. - * - * (2) The *ideal* sample delay time must not be greater than that - * allowed by the NFC. If it is, we can increase the data setup - * time, which will reduce the delay between the end of the data - * setup and the center of the eye. It will also make the eye - * larger, which might help with the next issue... - * - * (3) The *quantized* sample delay time must not fall either before the - * eye opens or after it closes (the latter is the problem - * illustrated in the above figure). - */ - - /* Jam a negative ideal sample delay to zero. */ - if (ideal_sample_delay_in_ns < 0) - ideal_sample_delay_in_ns = 0; - - /* - * Extend the data setup as needed to reduce the ideal sample delay - * below the maximum permitted by the NFC. - */ - while ((ideal_sample_delay_in_ns > max_sample_delay_in_ns) && - (data_setup_in_cycles < nfc->max_data_setup_cycles)) { - - /* Give a cycle to data setup. */ - data_setup_in_cycles++; - /* Synchronize the data setup time with the cycles. */ - data_setup_in_ns += clock_period_in_ns; - /* Adjust tEYE accordingly. */ - tEYE += clock_period_in_ns; - - /* - * Decrease the ideal sample delay by one half cycle, to keep it - * in the middle of the eye. - */ - ideal_sample_delay_in_ns -= (clock_period_in_ns >> 1); - - /* Jam a negative ideal sample delay to zero. */ - if (ideal_sample_delay_in_ns < 0) - ideal_sample_delay_in_ns = 0; - } - - /* - * Compute the sample delay factor that corresponds to the ideal sample - * delay. If the result is too large, then use the maximum allowed - * value. - * - * Notice that we use the ns_to_cycles function to compute the sample - * delay factor. We do this because the form of the computation is the - * same as that for calculating cycles. - */ - sample_delay_factor = - ns_to_cycles(ideal_sample_delay_in_ns << dll_delay_shift, - clock_period_in_ns, 0); - - if (sample_delay_factor > nfc->max_sample_delay_factor) - sample_delay_factor = nfc->max_sample_delay_factor; - - /* - * These macros conveniently encapsulate a computation we'll use to - * continuously evaluate whether or not the data sample delay is inside - * the eye. - */ - #define IDEAL_DELAY ((int) ideal_sample_delay_in_ns) - - #define QUANTIZED_DELAY \ - ((int) ((sample_delay_factor * clock_period_in_ns) >> \ - dll_delay_shift)) - - #define DELAY_ERROR (abs(QUANTIZED_DELAY - IDEAL_DELAY)) - - #define SAMPLE_IS_NOT_WITHIN_THE_EYE (DELAY_ERROR > (tEYE >> 1)) - - /* - * While the quantized sample time falls outside the eye, reduce the - * sample delay or extend the data setup to move the sampling point back - * toward the eye. Do not allow the number of data setup cycles to - * exceed the maximum allowed by the NFC. - */ - while (SAMPLE_IS_NOT_WITHIN_THE_EYE && - (data_setup_in_cycles < nfc->max_data_setup_cycles)) { - /* - * If control arrives here, the quantized sample delay falls - * outside the eye. Check if it's before the eye opens, or after - * the eye closes. - */ - if (QUANTIZED_DELAY > IDEAL_DELAY) { - /* - * If control arrives here, the quantized sample delay - * falls after the eye closes. Decrease the quantized - * delay time and then go back to re-evaluate. - */ - if (sample_delay_factor != 0) - sample_delay_factor--; - continue; - } - - /* - * If control arrives here, the quantized sample delay falls - * before the eye opens. Shift the sample point by increasing - * data setup time. This will also make the eye larger. - */ - - /* Give a cycle to data setup. */ - data_setup_in_cycles++; - /* Synchronize the data setup time with the cycles. */ - data_setup_in_ns += clock_period_in_ns; - /* Adjust tEYE accordingly. */ - tEYE += clock_period_in_ns; - - /* - * Decrease the ideal sample delay by one half cycle, to keep it - * in the middle of the eye. - */ - ideal_sample_delay_in_ns -= (clock_period_in_ns >> 1); - - /* ...and one less period for the delay time. */ - ideal_sample_delay_in_ns -= clock_period_in_ns; - - /* Jam a negative ideal sample delay to zero. */ - if (ideal_sample_delay_in_ns < 0) - ideal_sample_delay_in_ns = 0; - - /* - * We have a new ideal sample delay, so re-compute the quantized - * delay. - */ - sample_delay_factor = - ns_to_cycles( - ideal_sample_delay_in_ns << dll_delay_shift, - clock_period_in_ns, 0); - - if (sample_delay_factor > nfc->max_sample_delay_factor) - sample_delay_factor = nfc->max_sample_delay_factor; - } - - hw->data_setup_in_cycles = data_setup_in_cycles; - hw->data_hold_in_cycles = data_hold_in_cycles; - hw->address_setup_in_cycles = address_setup_in_cycles; - hw->use_half_periods = dll_use_half_periods; - hw->sample_delay_factor = sample_delay_factor; - hw->device_busy_timeout = GPMI_DEFAULT_BUSY_TIMEOUT; - hw->wrn_dly_sel = BV_GPMI_CTRL1_WRN_DLY_SEL_4_TO_8NS; -} - /* * <1> Firstly, we should know what's the GPMI-clock means. * The GPMI-clock is the internal clock in the gpmi nand controller. @@ -763,13 +362,10 @@ gpmi_nfc_compute_hardware_timings(struct gpmi_nand_data *this) * 4.1) From the aspect of the nand chip pins: * Delay = (tREA + C - tRP) {1} * - * tREA : the maximum read access time. From the ONFI nand standards, - * we know that tREA is 16ns in mode 5, tREA is 20ns is mode 4. - * Please check it in : www.onfi.org - * C : a constant for adjust the delay. default is 4. - * tRP : the read pulse width. - * Specified by the HW_GPMI_TIMING0:DATA_SETUP: - * tRP = (GPMI-clock-period) * DATA_SETUP + * tREA : the maximum read access time. + * C : a constant to adjust the delay. default is 4000ps. + * tRP : the read pulse width, which is exactly: + * tRP = (GPMI-clock-period) * DATA_SETUP * * 4.2) From the aspect of the GPMI nand controller: * Delay = RDN_DELAY * 0.125 * RP {2} @@ -782,74 +378,81 @@ gpmi_nfc_compute_hardware_timings(struct gpmi_nand_data *this) * * Set the HW_GPMI_CTRL1:HALF_PERIOD if GPMI-clock-period * is greater DLL_THRETHOLD. In other SOCs, the DLL_THRETHOLD - * is 16ns, but in mx6q, we use 12ns. + * is 16000ps, but in mx6q, we use 12000ps. * * 4.3) since {1} equals {2}, we get: * - * (tREA + 4 - tRP) * 8 - * RDN_DELAY = --------------------- {3} + * (tREA + 4000 - tRP) * 8 + * RDN_DELAY = ----------------------- {3} * RP - * - * 4.4) We only support the fastest asynchronous mode of ONFI nand. - * For some ONFI nand, the mode 4 is the fastest mode; - * while for some ONFI nand, the mode 5 is the fastest mode. - * So we only support the mode 4 and mode 5. It is no need to - * support other modes. */ -static void gpmi_nfc_compute_edo_timings(struct gpmi_nand_data *this, - int mode) +static void gpmi_nfc_compute_timings(struct gpmi_nand_data *this, + const struct nand_sdr_timings *sdr) { struct gpmi_nfc_hardware_timing *hw = &this->hw; - int dll_threshold = this->devdata->max_chain_delay; - unsigned long delay; - unsigned long clk_period; - int t_rp, t_rea, rp; - - /* Set the main clock to: 100MHz (mode 5) or 80MHz (mode 4) */ - hw->clk_rate = (mode == 5) ? 100000000 : 80000000; + unsigned int dll_threshold_ps = this->devdata->max_chain_delay; + unsigned int period_ps, reference_period_ps; + unsigned int data_setup_cycles, data_hold_cycles, addr_setup_cycles; + unsigned int tRP_ps; + bool use_half_period; + int sample_delay_ps, sample_delay_factor; + u16 busy_timeout_cycles; + u8 wrn_dly_sel; + + if (sdr->tRC_min >= 30000) { + /* ONFI non-EDO modes [0-3] */ + hw->clk_rate = 22000000; + wrn_dly_sel = BV_GPMI_CTRL1_WRN_DLY_SEL_4_TO_8NS; + } else if (sdr->tRC_min >= 25000) { + /* ONFI EDO mode 4 */ + hw->clk_rate = 80000000; + wrn_dly_sel = BV_GPMI_CTRL1_WRN_DLY_SEL_NO_DELAY; + } else { + /* ONFI EDO mode 5 */ + hw->clk_rate = 100000000; + wrn_dly_sel = BV_GPMI_CTRL1_WRN_DLY_SEL_NO_DELAY; + } - /* - * [1] for GPMI_HW_GPMI_TIMING0: - * The async mode requires 40MHz for mode 4, 50MHz for mode 5. - * The GPMI can support 100MHz at most. So if we want to - * get the 40MHz or 50MHz, we have to set DS=1, DH=1. - * Set the ADDRESS_SETUP to 0 in mode 4. - */ - hw->data_setup_in_cycles = 1; - hw->data_hold_in_cycles = 1; - hw->address_setup_in_cycles = (mode == 5) ? 1 : 0; + /* SDR core timings are given in picoseconds */ + period_ps = div_u64((u64)NSEC_PER_SEC * 1000, hw->clk_rate); - /* [2] for GPMI_HW_GPMI_TIMING1 */ - hw->device_busy_timeout = 0x9000; + addr_setup_cycles = TO_CYCLES(sdr->tALS_min, period_ps); + data_setup_cycles = TO_CYCLES(sdr->tDS_min, period_ps); + data_hold_cycles = TO_CYCLES(sdr->tDH_min, period_ps); + busy_timeout_cycles = TO_CYCLES(sdr->tWB_max + sdr->tR_max, period_ps); - /* [3] for GPMI_HW_GPMI_CTRL1 */ - hw->wrn_dly_sel = BV_GPMI_CTRL1_WRN_DLY_SEL_NO_DELAY; + hw->timing0 = BF_GPMI_TIMING0_ADDRESS_SETUP(addr_setup_cycles) | + BF_GPMI_TIMING0_DATA_HOLD(data_hold_cycles) | + BF_GPMI_TIMING0_DATA_SETUP(data_setup_cycles); + hw->timing1 = BF_GPMI_TIMING1_BUSY_TIMEOUT(busy_timeout_cycles * 4096); /* - * Enlarge 10 times for the numerator and denominator in {3}. - * This make us to get more accurate result. + * Derive NFC ideal delay from {3}: + * + * (tREA + 4000 - tRP) * 8 + * RDN_DELAY = ----------------------- + * RP */ - clk_period = NSEC_PER_SEC / (hw->clk_rate / 10); - dll_threshold *= 10; - t_rea = this->timing.tREA_in_ns * 10; - t_rp = clk_period * 1; /* DATA_SETUP is 1 */ - - if (clk_period > dll_threshold) { - hw->use_half_periods = 1; - rp = clk_period / 2; + if (period_ps > dll_threshold_ps) { + use_half_period = true; + reference_period_ps = period_ps / 2; } else { - hw->use_half_periods = 0; - rp = clk_period; + use_half_period = false; + reference_period_ps = period_ps; } - /* - * Multiply the numerator with 10, we could do a round off: - * 7.8 round up to 8; 7.4 round down to 7. - */ - delay = (((t_rea + 40 - t_rp) * 8) * 10) / rp; - delay = (delay + 5) / 10; + tRP_ps = data_setup_cycles * period_ps; + sample_delay_ps = (sdr->tREA_max + 4000 - tRP_ps) * 8; + if (sample_delay_ps > 0) + sample_delay_factor = sample_delay_ps / reference_period_ps; + else + sample_delay_factor = 0; - hw->sample_delay_factor = delay; + hw->ctrl1n = BF_GPMI_CTRL1_WRN_DLY_SEL(wrn_dly_sel); + if (sample_delay_factor) + hw->ctrl1n |= BF_GPMI_CTRL1_RDN_DELAY(sample_delay_factor) | + BM_GPMI_CTRL1_DLL_ENABLE | + (use_half_period ? BM_GPMI_CTRL1_HALF_PERIOD : 0); } void gpmi_nfc_apply_timings(struct gpmi_nand_data *this) @@ -857,64 +460,27 @@ void gpmi_nfc_apply_timings(struct gpmi_nand_data *this) struct gpmi_nfc_hardware_timing *hw = &this->hw; struct resources *r = &this->resources; void __iomem *gpmi_regs = r->gpmi_regs; - unsigned int clock_period_in_ns; - uint32_t reg; - unsigned int dll_wait_time_in_us; + unsigned int dll_wait_time_us; - /* [0] Set the main clock rate */ clk_set_rate(r->clock[0], hw->clk_rate); - /* [1] Set HW_GPMI_TIMING0 */ - reg = BF_GPMI_TIMING0_ADDRESS_SETUP(hw->address_setup_in_cycles) | - BF_GPMI_TIMING0_DATA_HOLD(hw->data_hold_in_cycles) | - BF_GPMI_TIMING0_DATA_SETUP(hw->data_setup_in_cycles); - - writel(reg, gpmi_regs + HW_GPMI_TIMING0); - - /* [2] Set HW_GPMI_TIMING1 */ - writel(BF_GPMI_TIMING1_BUSY_TIMEOUT(hw->device_busy_timeout), - gpmi_regs + HW_GPMI_TIMING1); - - /* [3] The following code is to set the HW_GPMI_CTRL1. */ - - /* Set the WRN_DLY_SEL */ - writel(BM_GPMI_CTRL1_WRN_DLY_SEL, gpmi_regs + HW_GPMI_CTRL1_CLR); - writel(BF_GPMI_CTRL1_WRN_DLY_SEL(hw->wrn_dly_sel), - gpmi_regs + HW_GPMI_CTRL1_SET); - - /* DLL_ENABLE must be set to 0 when setting RDN_DELAY or HALF_PERIOD. */ - writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_CLR); - - /* Clear out the DLL control fields. */ - reg = BM_GPMI_CTRL1_RDN_DELAY | BM_GPMI_CTRL1_HALF_PERIOD; - writel(reg, gpmi_regs + HW_GPMI_CTRL1_CLR); - - /* If no sample delay is called for, return immediately. */ - if (!hw->sample_delay_factor) - return; - - /* Set RDN_DELAY or HALF_PERIOD. */ - reg = ((hw->use_half_periods) ? BM_GPMI_CTRL1_HALF_PERIOD : 0) - | BF_GPMI_CTRL1_RDN_DELAY(hw->sample_delay_factor); - - writel(reg, gpmi_regs + HW_GPMI_CTRL1_SET); - - /* At last, we enable the DLL. */ - writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_SET); + writel(hw->timing0, gpmi_regs + HW_GPMI_TIMING0); + writel(hw->timing1, gpmi_regs + HW_GPMI_TIMING1); /* - * After we enable the GPMI DLL, we have to wait 64 clock cycles before - * we can use the GPMI. Calculate the amount of time we need to wait, - * in microseconds. + * Clear several CTRL1 fields, DLL must be disabled when setting + * RDN_DELAY or HALF_PERIOD. */ - clock_period_in_ns = NSEC_PER_SEC / hw->clk_rate; - dll_wait_time_in_us = (clock_period_in_ns * 64) / 1000; + writel(BM_GPMI_CTRL1_CLEAR_MASK, gpmi_regs + HW_GPMI_CTRL1_CLR); + writel(hw->ctrl1n, gpmi_regs + HW_GPMI_CTRL1_SET); - if (!dll_wait_time_in_us) - dll_wait_time_in_us = 1; + /* Wait 64 clock cycles before using the GPMI after enabling the DLL */ + dll_wait_time_us = USEC_PER_SEC / hw->clk_rate * 64; + if (!dll_wait_time_us) + dll_wait_time_us = 1; /* Wait for the DLL to settle. */ - udelay(dll_wait_time_in_us); + udelay(dll_wait_time_us); } int gpmi_setup_data_interface(struct mtd_info *mtd, int chipnr, @@ -923,33 +489,22 @@ int gpmi_setup_data_interface(struct mtd_info *mtd, int chipnr, struct nand_chip *chip = mtd_to_nand(mtd); struct gpmi_nand_data *this = nand_get_controller_data(chip); const struct nand_sdr_timings *sdr; - bool edo_mode = false; /* Retrieve required NAND timings */ sdr = nand_get_sdr_timings(conf); if (IS_ERR(sdr)) return PTR_ERR(sdr); - if (sdr->tRC_min <= 25000) - edo_mode = true; - /* Only MX6 GPMI controller can reach EDO timings */ - if (edo_mode && !GPMI_IS_MX6(this)) + if (sdr->tRC_min <= 25000 && !GPMI_IS_MX6(this)) return -ENOTSUPP; + /* Stop here if this call was just a check */ if (chipnr < 0) return 0; - this->timing.tREA_in_ns = sdr->tREA_max / 1000; - this->timing.tRLOH_in_ns = sdr->tRLOH_min / 1000; - this->timing.tRHOH_in_ns = sdr->tRHOH_min / 1000; - - /* Compute GPMI parameters depending on the mode */ - if (edo_mode) - gpmi_nfc_compute_edo_timings(this, - sdr->tRC_min > 20000 ? 4 : 5); - else - gpmi_nfc_compute_hardware_timings(this); + /* Do the actual derivation of the controller timings */ + gpmi_nfc_compute_timings(this, sdr); this->hw.must_apply_timings = true; diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c index e7e01934f50d..c2597c8107a0 100644 --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c @@ -94,7 +94,7 @@ static const struct mtd_ooblayout_ops gpmi_ooblayout_ops = { static const struct gpmi_devdata gpmi_devdata_imx23 = { .type = IS_MX23, .bch_max_ecc_strength = 20, - .max_chain_delay = 16, + .max_chain_delay = 16000, .clks = gpmi_clks_for_mx2x, .clks_count = ARRAY_SIZE(gpmi_clks_for_mx2x), }; @@ -102,7 +102,7 @@ static const struct gpmi_devdata gpmi_devdata_imx23 = { static const struct gpmi_devdata gpmi_devdata_imx28 = { .type = IS_MX28, .bch_max_ecc_strength = 20, - .max_chain_delay = 16, + .max_chain_delay = 16000, .clks = gpmi_clks_for_mx2x, .clks_count = ARRAY_SIZE(gpmi_clks_for_mx2x), }; @@ -114,7 +114,7 @@ static const char * const gpmi_clks_for_mx6[] = { static const struct gpmi_devdata gpmi_devdata_imx6q = { .type = IS_MX6Q, .bch_max_ecc_strength = 40, - .max_chain_delay = 12, + .max_chain_delay = 12000, .clks = gpmi_clks_for_mx6, .clks_count = ARRAY_SIZE(gpmi_clks_for_mx6), }; @@ -122,7 +122,7 @@ static const struct gpmi_devdata gpmi_devdata_imx6q = { static const struct gpmi_devdata gpmi_devdata_imx6sx = { .type = IS_MX6SX, .bch_max_ecc_strength = 62, - .max_chain_delay = 12, + .max_chain_delay = 12000, .clks = gpmi_clks_for_mx6, .clks_count = ARRAY_SIZE(gpmi_clks_for_mx6), }; @@ -134,7 +134,7 @@ static const char * const gpmi_clks_for_mx7d[] = { static const struct gpmi_devdata gpmi_devdata_imx7d = { .type = IS_MX7D, .bch_max_ecc_strength = 62, - .max_chain_delay = 12, + .max_chain_delay = 12000, .clks = gpmi_clks_for_mx7d, .clks_count = ARRAY_SIZE(gpmi_clks_for_mx7d), }; @@ -695,34 +695,6 @@ static void release_resources(struct gpmi_nand_data *this) release_dma_channels(this); } -static int init_hardware(struct gpmi_nand_data *this) -{ - int ret; - - /* - * This structure contains the "safe" GPMI timing that should succeed - * with any NAND Flash device - * (although, with less-than-optimal performance). - */ - struct nand_timing safe_timing = { - .data_setup_in_ns = 80, - .data_hold_in_ns = 60, - .address_setup_in_ns = 25, - .gpmi_sample_delay_in_ns = 6, - .tREA_in_ns = -1, - .tRLOH_in_ns = -1, - .tRHOH_in_ns = -1, - }; - - /* Initialize the hardwares. */ - ret = gpmi_init(this); - if (ret) - return ret; - - this->timing = safe_timing; - return 0; -} - static int read_page_prepare(struct gpmi_nand_data *this, void *destination, unsigned length, void *alt_virt, dma_addr_t alt_phys, unsigned alt_size, @@ -2107,7 +2079,7 @@ static int gpmi_nand_probe(struct platform_device *pdev) if (ret) goto exit_acquire_resources; - ret = init_hardware(this); + ret = gpmi_init(this); if (ret) goto exit_nfc_init; diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h index 23f9030cf6d2..62fde59b995f 100644 --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h @@ -86,39 +86,6 @@ enum dma_ops_type { DMA_FOR_WRITE_ECC_PAGE }; -/** - * struct nand_timing - Fundamental timing attributes for NAND. - * @data_setup_in_ns: The data setup time, in nanoseconds. Usually the - * maximum of tDS and tWP. A negative value - * indicates this characteristic isn't known. - * @data_hold_in_ns: The data hold time, in nanoseconds. Usually the - * maximum of tDH, tWH and tREH. A negative value - * indicates this characteristic isn't known. - * @address_setup_in_ns: The address setup time, in nanoseconds. Usually - * the maximum of tCLS, tCS and tALS. A negative - * value indicates this characteristic isn't known. - * @gpmi_sample_delay_in_ns: A GPMI-specific timing parameter. A negative value - * indicates this characteristic isn't known. - * @tREA_in_ns: tREA, in nanoseconds, from the data sheet. A - * negative value indicates this characteristic isn't - * known. - * @tRLOH_in_ns: tRLOH, in nanoseconds, from the data sheet. A - * negative value indicates this characteristic isn't - * known. - * @tRHOH_in_ns: tRHOH, in nanoseconds, from the data sheet. A - * negative value indicates this characteristic isn't - * known. - */ -struct nand_timing { - int8_t data_setup_in_ns; - int8_t data_hold_in_ns; - int8_t address_setup_in_ns; - int8_t gpmi_sample_delay_in_ns; - int8_t tREA_in_ns; - int8_t tRLOH_in_ns; - int8_t tRHOH_in_ns; -}; - enum gpmi_type { IS_MX23, IS_MX28, @@ -137,41 +104,21 @@ struct gpmi_devdata { /** * struct gpmi_nfc_hardware_timing - GPMI hardware timing parameters. - * @timing_mode: The timing mode to comply with. * @must_apply_timings: Whether controller timings have already been * applied or not (useful only while there is * support for only one chip select) * @clk_rate: The clock rate that must be used to derive the - * following parameters. - * @data_setup_in_cycles: The data setup time, in cycles. - * @data_hold_in_cycles: The data hold time, in cycles. - * @address_setup_in_cycles: The address setup time, in cycles. - * @device_busy_timeout: The timeout waiting for NAND Ready/Busy, - * this value is the number of cycles multiplied - * by 4096. - * @use_half_periods: Indicates the clock is running slowly, so the - * NFC DLL should use half-periods. - * @sample_delay_factor: The sample delay factor. - * @wrn_dly_sel: The delay on the GPMI write strobe. + * following parameters + * @timing0: HW_GPMI_TIMING0 register + * @timing1: HW_GPMI_TIMING1 register + * @ctrl1n: HW_GPMI_CTRL1n register */ struct gpmi_nfc_hardware_timing { - unsigned int timing_mode; bool must_apply_timings; unsigned long int clk_rate; - - /* for HW_GPMI_TIMING0 */ - u8 data_setup_in_cycles; - u8 data_hold_in_cycles; - u8 address_setup_in_cycles; - - /* for HW_GPMI_TIMING1 */ - u16 device_busy_timeout; -#define GPMI_DEFAULT_BUSY_TIMEOUT 0x500 /* default busy timeout value.*/ - - /* for HW_GPMI_CTRL1 */ - bool use_half_periods; - u8 sample_delay_factor; - u8 wrn_dly_sel; + u32 timing0; + u32 timing1; + u32 ctrl1n; }; struct gpmi_nand_data { @@ -186,8 +133,6 @@ struct gpmi_nand_data { struct resources resources; /* Flash Hardware */ - struct nand_timing timing; - int timing_mode; struct gpmi_nfc_hardware_timing hw; /* BCH */ @@ -241,40 +186,6 @@ struct gpmi_nand_data { void *private; }; -/** - * struct timing_threshold - Timing threshold - * @max_data_setup_cycles: The maximum number of data setup cycles that - * can be expressed in the hardware. - * @internal_data_setup_in_ns: The time, in ns, that the NFC hardware requires - * for data read internal setup. In the Reference - * Manual, see the chapter "High-Speed NAND - * Timing" for more details. - * @max_sample_delay_factor: The maximum sample delay factor that can be - * expressed in the hardware. - * @max_dll_clock_period_in_ns: The maximum period of the GPMI clock that the - * sample delay DLL hardware can possibly work - * with (the DLL is unusable with longer periods). - * If the full-cycle period is greater than HALF - * this value, the DLL must be configured to use - * half-periods. - * @max_dll_delay_in_ns: The maximum amount of delay, in ns, that the - * DLL can implement. - * @clock_frequency_in_hz: The clock frequency, in Hz, during the current - * I/O transaction. If no I/O transaction is in - * progress, this is the clock frequency during - * the most recent I/O transaction. - */ -struct timing_threshold { - const unsigned int max_chip_count; - const unsigned int max_data_setup_cycles; - const unsigned int internal_data_setup_in_ns; - const unsigned int max_sample_delay_factor; - const unsigned int max_dll_clock_period_in_ns; - const unsigned int max_dll_delay_in_ns; - unsigned long clock_frequency_in_hz; - -}; - /* Common Services */ int common_nfc_set_geometry(struct gpmi_nand_data *); struct dma_chan *get_dma_chan(struct gpmi_nand_data *); diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-regs.h b/drivers/mtd/nand/raw/gpmi-nand/gpmi-regs.h index 82114cdc8330..d92bf32221ca 100644 --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-regs.h +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-regs.h @@ -147,6 +147,11 @@ #define BM_GPMI_CTRL1_GPMI_MODE (1 << 0) +#define BM_GPMI_CTRL1_CLEAR_MASK (BM_GPMI_CTRL1_WRN_DLY_SEL | \ + BM_GPMI_CTRL1_DLL_ENABLE | \ + BM_GPMI_CTRL1_RDN_DELAY | \ + BM_GPMI_CTRL1_HALF_PERIOD) + #define HW_GPMI_TIMING0 0x00000070 #define BP_GPMI_TIMING0_ADDRESS_SETUP 16 |