/* * Freescale GPMI NAND Flash Driver * * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. * Copyright (C) 2008 Embedded Alley Solutions, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include "gpmi-nand.h" #include "gpmi-regs.h" #include "bch-regs.h" struct timing_threshod 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, }; /* * Clear the bit and poll it cleared. This is usually called with * a reset address and mask being either SFTRST(bit 31) or CLKGATE * (bit 30). */ static int clear_poll_bit(void __iomem *addr, u32 mask) { int timeout = 0x400; /* clear the bit */ __mxs_clrl(mask, addr); /* * SFTRST needs 3 GPMI clocks to settle, the reference manual * recommends to wait 1us. */ udelay(1); /* poll the bit becoming clear */ while ((readl(addr) & mask) && --timeout) /* nothing */; return !timeout; } #define MODULE_CLKGATE (1 << 30) #define MODULE_SFTRST (1 << 31) /* * The current mxs_reset_block() will do two things: * [1] enable the module. * [2] reset the module. * * In most of the cases, it's ok. * But in MX23, there is a hardware bug in the BCH block (see erratum #2847). * If you try to soft reset the BCH block, it becomes unusable until * the next hard reset. This case occurs in the NAND boot mode. When the board * boots by NAND, the ROM of the chip will initialize the BCH blocks itself. * So If the driver tries to reset the BCH again, the BCH will not work anymore. * You will see a DMA timeout in this case. The bug has been fixed * in the following chips, such as MX28. * * To avoid this bug, just add a new parameter `just_enable` for * the mxs_reset_block(), and rewrite it here. */ static int gpmi_reset_block(void __iomem *reset_addr, bool just_enable) { int ret; int timeout = 0x400; /* clear and poll SFTRST */ ret = clear_poll_bit(reset_addr, MODULE_SFTRST); if (unlikely(ret)) goto error; /* clear CLKGATE */ __mxs_clrl(MODULE_CLKGATE, reset_addr); if (!just_enable) { /* set SFTRST to reset the block */ __mxs_setl(MODULE_SFTRST, reset_addr); udelay(1); /* poll CLKGATE becoming set */ while ((!(readl(reset_addr) & MODULE_CLKGATE)) && --timeout) /* nothing */; if (unlikely(!timeout)) goto error; } /* clear and poll SFTRST */ ret = clear_poll_bit(reset_addr, MODULE_SFTRST); if (unlikely(ret)) goto error; /* clear and poll CLKGATE */ ret = clear_poll_bit(reset_addr, MODULE_CLKGATE); if (unlikely(ret)) goto error; return 0; error: pr_err("%s(%p): module reset timeout\n", __func__, reset_addr); return -ETIMEDOUT; } int gpmi_init(struct gpmi_nand_data *this) { struct resources *r = &this->resources; int ret; ret = clk_prepare_enable(r->clock); if (ret) goto err_out; ret = gpmi_reset_block(r->gpmi_regs, false); if (ret) goto err_out; /* Choose NAND mode. */ writel(BM_GPMI_CTRL1_GPMI_MODE, r->gpmi_regs + HW_GPMI_CTRL1_CLR); /* Set the IRQ polarity. */ writel(BM_GPMI_CTRL1_ATA_IRQRDY_POLARITY, r->gpmi_regs + HW_GPMI_CTRL1_SET); /* Disable Write-Protection. */ writel(BM_GPMI_CTRL1_DEV_RESET, r->gpmi_regs + HW_GPMI_CTRL1_SET); /* Select BCH ECC. */ writel(BM_GPMI_CTRL1_BCH_MODE, r->gpmi_regs + HW_GPMI_CTRL1_SET); clk_disable_unprepare(r->clock); return 0; err_out: return ret; } /* This function is very useful. It is called only when the bug occur. */ void gpmi_dump_info(struct gpmi_nand_data *this) { struct resources *r = &this->resources; struct bch_geometry *geo = &this->bch_geometry; u32 reg; int i; pr_err("Show GPMI registers :\n"); for (i = 0; i <= HW_GPMI_DEBUG / 0x10 + 1; i++) { reg = readl(r->gpmi_regs + i * 0x10); pr_err("offset 0x%.3x : 0x%.8x\n", i * 0x10, reg); } /* start to print out the BCH info */ pr_err("BCH Geometry :\n"); pr_err("GF length : %u\n", geo->gf_len); pr_err("ECC Strength : %u\n", geo->ecc_strength); pr_err("Page Size in Bytes : %u\n", geo->page_size); pr_err("Metadata Size in Bytes : %u\n", geo->metadata_size); pr_err("ECC Chunk Size in Bytes: %u\n", geo->ecc_chunk_size); pr_err("ECC Chunk Count : %u\n", geo->ecc_chunk_count); pr_err("Payload Size in Bytes : %u\n", geo->payload_size); pr_err("Auxiliary Size in Bytes: %u\n", geo->auxiliary_size); pr_err("Auxiliary Status Offset: %u\n", geo->auxiliary_status_offset); pr_err("Block Mark Byte Offset : %u\n", geo->block_mark_byte_offset); pr_err("Block Mark Bit Offset : %u\n", geo->block_mark_bit_offset); } /* Configures the geometry for BCH. */ int bch_set_geometry(struct gpmi_nand_data *this) { struct resources *r = &this->resources; struct bch_geometry *bch_geo = &this->bch_geometry; unsigned int block_count; unsigned int block_size; unsigned int metadata_size; unsigned int ecc_strength; unsigned int page_size; int ret; if (common_nfc_set_geometry(this)) return !0; block_count = bch_geo->ecc_chunk_count - 1; block_size = bch_geo->ecc_chunk_size; metadata_size = bch_geo->metadata_size; ecc_strength = bch_geo->ecc_strength >> 1; page_size = bch_geo->page_size; ret = clk_prepare_enable(r->clock); if (ret) goto err_out; /* * Due to erratum #2847 of the MX23, the BCH cannot be soft reset on this * chip, otherwise it will lock up. So we skip resetting BCH on the MX23. * On the other hand, the MX28 needs the reset, because one case has been * seen where the BCH produced ECC errors constantly after 10000 * consecutive reboots. The latter case has not been seen on the MX23 yet, * still we don't know if it could happen there as well. */ ret = gpmi_reset_block(r->bch_regs, GPMI_IS_MX23(this)); if (ret) goto err_out; /* Configure layout 0. */ writel(BF_BCH_FLASH0LAYOUT0_NBLOCKS(block_count) | BF_BCH_FLASH0LAYOUT0_META_SIZE(metadata_size) | BF_BCH_FLASH0LAYOUT0_ECC0(ecc_strength) | BF_BCH_FLASH0LAYOUT0_DATA0_SIZE(block_size), r->bch_regs + HW_BCH_FLASH0LAYOUT0); writel(BF_BCH_FLASH0LAYOUT1_PAGE_SIZE(page_size) | BF_BCH_FLASH0LAYOUT1_ECCN(ecc_strength) | BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(block_size), r->bch_regs + HW_BCH_FLASH0LAYOUT1); /* Set *all* chip selects to use layout 0. */ writel(0, r->bch_regs + HW_BCH_LAYOUTSELECT); /* Enable interrupts. */ writel(BM_BCH_CTRL_COMPLETE_IRQ_EN, r->bch_regs + HW_BCH_CTRL_SET); clk_disable_unprepare(r->clock); return 0; 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); } /* Apply timing to current hardware conditions. */ static int gpmi_nfc_compute_hardware_timing(struct gpmi_nand_data *this, struct gpmi_nfc_hardware_timing *hw) { struct gpmi_nand_platform_data *pdata = this->pdata; struct timing_threshod *nfc = &timing_default_threshold; struct nand_chip *nand = &this->nand; struct nand_timing target = this->timing; bool improved_timing_is_available; 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 = pdata->min_prop_delay_in_ns; unsigned int max_prop_delay_in_ns = pdata->max_prop_delay_in_ns; /* * 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; } /* Check if improved timing information is available. */ improved_timing_is_available = (target.tREA_in_ns >= 0) && (target.tRLOH_in_ns >= 0) && (target.tRHOH_in_ns >= 0) ; /* Inspect the clock. */ clock_frequency_in_hz = nfc->clock_frequency_in_hz; clock_period_in_ns = 1000000000 / 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; } /* * Check if improved timing information is available. If not, we have to * use a less-sophisticated algorithm. */ if (!improved_timing_is_available) { /* * Fold the read setup time required by the NFC into the ideal * sample delay. */ ideal_sample_delay_in_ns = target.gpmi_sample_delay_in_ns + nfc->internal_data_setup_in_ns; /* * The ideal sample delay may be greater than the maximum * allowed by the NFC. If so, we can trade off sample delay time * for more data setup time. * * In each iteration of the following loop, we add a cycle to * the data setup time and subtract a corresponding amount from * the sample delay until we've satisified the constraints or * can't do any better. */ while ((ideal_sample_delay_in_ns > max_sample_delay_in_ns) && (data_setup_in_cycles < nfc->max_data_setup_cycles)) { data_setup_in_cycles++; ideal_sample_delay_in_ns -= clock_period_in_ns; if (ideal_sample_delay_in_ns < 0) ideal_sample_delay_in_ns = 0; } /* * Compute the sample delay factor that corresponds most closely * to the ideal sample delay. If the result is too large for the * NFC, use the maximum 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; /* Skip to the part where we return our results. */ goto return_results; } /* * If control arrives here, we have more detailed timing information, * so we can use a better algorithm. */ /* * 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; } /* Control arrives here when we're ready to return our results. */ return_results: 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; /* Return success. */ return 0; } /* Begin the I/O */ void gpmi_begin(struct gpmi_nand_data *this) { struct resources *r = &this->resources; struct timing_threshod *nfc = &timing_default_threshold; unsigned char *gpmi_regs = r->gpmi_regs; unsigned int clock_period_in_ns; uint32_t reg; unsigned int dll_wait_time_in_us; struct gpmi_nfc_hardware_timing hw; int ret; /* Enable the clock. */ ret = clk_prepare_enable(r->clock); if (ret) { pr_err("We failed in enable the clk\n"); goto err_out; } /* set ready/busy timeout */ writel(0x500 << BP_GPMI_TIMING1_BUSY_TIMEOUT, gpmi_regs + HW_GPMI_TIMING1); /* Get the timing information we need. */ nfc->clock_frequency_in_hz = clk_get_rate(r->clock); clock_period_in_ns = 1000000000 / nfc->clock_frequency_in_hz; gpmi_nfc_compute_hardware_timing(this, &hw); /* Set up all the simple timing parameters. */ 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); /* * 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. */ writel(BM_GPMI_CTRL1_RDN_DELAY, gpmi_regs + HW_GPMI_CTRL1_CLR); writel(BM_GPMI_CTRL1_HALF_PERIOD, gpmi_regs + HW_GPMI_CTRL1_CLR); /* If no sample delay is called for, return immediately. */ if (!hw.sample_delay_factor) return; /* Configure the HALF_PERIOD flag. */ if (hw.use_half_periods) writel(BM_GPMI_CTRL1_HALF_PERIOD, gpmi_regs + HW_GPMI_CTRL1_SET); /* Set the delay factor. */ writel(BF_GPMI_CTRL1_RDN_DELAY(hw.sample_delay_factor), gpmi_regs + HW_GPMI_CTRL1_SET); /* Enable the DLL. */ writel(BM_GPMI_CTRL1_DLL_ENABLE, gpmi_regs + HW_GPMI_CTRL1_SET); /* * 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. */ dll_wait_time_in_us = (clock_period_in_ns * 64) / 1000; if (!dll_wait_time_in_us) dll_wait_time_in_us = 1; /* Wait for the DLL to settle. */ udelay(dll_wait_time_in_us); err_out: return; } void gpmi_end(struct gpmi_nand_data *this) { struct resources *r = &this->resources; clk_disable_unprepare(r->clock); } /* Clears a BCH interrupt. */ void gpmi_clear_bch(struct gpmi_nand_data *this) { struct resources *r = &this->resources; writel(BM_BCH_CTRL_COMPLETE_IRQ, r->bch_regs + HW_BCH_CTRL_CLR); } /* Returns the Ready/Busy status of the given chip. */ int gpmi_is_ready(struct gpmi_nand_data *this, unsigned chip) { struct resources *r = &this->resources; uint32_t mask = 0; uint32_t reg = 0; if (GPMI_IS_MX23(this)) { mask = MX23_BM_GPMI_DEBUG_READY0 << chip; reg = readl(r->gpmi_regs + HW_GPMI_DEBUG); } else if (GPMI_IS_MX28(this)) { mask = MX28_BF_GPMI_STAT_READY_BUSY(1 << chip); reg = readl(r->gpmi_regs + HW_GPMI_STAT); } else pr_err("unknow arch.\n"); return reg & mask; } static inline void set_dma_type(struct gpmi_nand_data *this, enum dma_ops_type type) { this->last_dma_type = this->dma_type; this->dma_type = type; } int gpmi_send_command(struct gpmi_nand_data *this) { struct dma_chan *channel = get_dma_chan(this); struct dma_async_tx_descriptor *desc; struct scatterlist *sgl; int chip = this->current_chip; u32 pio[3]; /* [1] send out the PIO words */ pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(BV_GPMI_CTRL0_COMMAND_MODE__WRITE) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(BV_GPMI_CTRL0_ADDRESS__NAND_CLE) | BM_GPMI_CTRL0_ADDRESS_INCREMENT | BF_GPMI_CTRL0_XFER_COUNT(this->command_length); pio[1] = pio[2] = 0; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, ARRAY_SIZE(pio), DMA_TRANS_NONE, 0); if (!desc) { pr_err("step 1 error\n"); return -1; } /* [2] send out the COMMAND + ADDRESS string stored in @buffer */ sgl = &this->cmd_sgl; sg_init_one(sgl, this->cmd_buffer, this->command_length); dma_map_sg(this->dev, sgl, 1, DMA_TO_DEVICE); desc = channel->device->device_prep_slave_sg(channel, sgl, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { pr_err("step 2 error\n"); return -1; } /* [3] submit the DMA */ set_dma_type(this, DMA_FOR_COMMAND); return start_dma_without_bch_irq(this, desc); } int gpmi_send_data(struct gpmi_nand_data *this) { struct dma_async_tx_descriptor *desc; struct dma_chan *channel = get_dma_chan(this); int chip = this->current_chip; uint32_t command_mode; uint32_t address; u32 pio[2]; /* [1] PIO */ command_mode = BV_GPMI_CTRL0_COMMAND_MODE__WRITE; address = BV_GPMI_CTRL0_ADDRESS__NAND_DATA; pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(command_mode) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(address) | BF_GPMI_CTRL0_XFER_COUNT(this->upper_len); pio[1] = 0; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, ARRAY_SIZE(pio), DMA_TRANS_NONE, 0); if (!desc) { pr_err("step 1 error\n"); return -1; } /* [2] send DMA request */ prepare_data_dma(this, DMA_TO_DEVICE); desc = channel->device->device_prep_slave_sg(channel, &this->data_sgl, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { pr_err("step 2 error\n"); return -1; } /* [3] submit the DMA */ set_dma_type(this, DMA_FOR_WRITE_DATA); return start_dma_without_bch_irq(this, desc); } int gpmi_read_data(struct gpmi_nand_data *this) { struct dma_async_tx_descriptor *desc; struct dma_chan *channel = get_dma_chan(this); int chip = this->current_chip; u32 pio[2]; /* [1] : send PIO */ pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(BV_GPMI_CTRL0_COMMAND_MODE__READ) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(BV_GPMI_CTRL0_ADDRESS__NAND_DATA) | BF_GPMI_CTRL0_XFER_COUNT(this->upper_len); pio[1] = 0; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, ARRAY_SIZE(pio), DMA_TRANS_NONE, 0); if (!desc) { pr_err("step 1 error\n"); return -1; } /* [2] : send DMA request */ prepare_data_dma(this, DMA_FROM_DEVICE); desc = channel->device->device_prep_slave_sg(channel, &this->data_sgl, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { pr_err("step 2 error\n"); return -1; } /* [3] : submit the DMA */ set_dma_type(this, DMA_FOR_READ_DATA); return start_dma_without_bch_irq(this, desc); } int gpmi_send_page(struct gpmi_nand_data *this, dma_addr_t payload, dma_addr_t auxiliary) { struct bch_geometry *geo = &this->bch_geometry; uint32_t command_mode; uint32_t address; uint32_t ecc_command; uint32_t buffer_mask; struct dma_async_tx_descriptor *desc; struct dma_chan *channel = get_dma_chan(this); int chip = this->current_chip; u32 pio[6]; /* A DMA descriptor that does an ECC page read. */ command_mode = BV_GPMI_CTRL0_COMMAND_MODE__WRITE; address = BV_GPMI_CTRL0_ADDRESS__NAND_DATA; ecc_command = BV_GPMI_ECCCTRL_ECC_CMD__BCH_ENCODE; buffer_mask = BV_GPMI_ECCCTRL_BUFFER_MASK__BCH_PAGE | BV_GPMI_ECCCTRL_BUFFER_MASK__BCH_AUXONLY; pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(command_mode) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(address) | BF_GPMI_CTRL0_XFER_COUNT(0); pio[1] = 0; pio[2] = BM_GPMI_ECCCTRL_ENABLE_ECC | BF_GPMI_ECCCTRL_ECC_CMD(ecc_command) | BF_GPMI_ECCCTRL_BUFFER_MASK(buffer_mask); pio[3] = geo->page_size; pio[4] = payload; pio[5] = auxiliary; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, ARRAY_SIZE(pio), DMA_TRANS_NONE, DMA_CTRL_ACK); if (!desc) { pr_err("step 2 error\n"); return -1; } set_dma_type(this, DMA_FOR_WRITE_ECC_PAGE); return start_dma_with_bch_irq(this, desc); } int gpmi_read_page(struct gpmi_nand_data *this, dma_addr_t payload, dma_addr_t auxiliary) { struct bch_geometry *geo = &this->bch_geometry; uint32_t command_mode; uint32_t address; uint32_t ecc_command; uint32_t buffer_mask; struct dma_async_tx_descriptor *desc; struct dma_chan *channel = get_dma_chan(this); int chip = this->current_chip; u32 pio[6]; /* [1] Wait for the chip to report ready. */ command_mode = BV_GPMI_CTRL0_COMMAND_MODE__WAIT_FOR_READY; address = BV_GPMI_CTRL0_ADDRESS__NAND_DATA; pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(command_mode) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(address) | BF_GPMI_CTRL0_XFER_COUNT(0); pio[1] = 0; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, 2, DMA_TRANS_NONE, 0); if (!desc) { pr_err("step 1 error\n"); return -1; } /* [2] Enable the BCH block and read. */ command_mode = BV_GPMI_CTRL0_COMMAND_MODE__READ; address = BV_GPMI_CTRL0_ADDRESS__NAND_DATA; ecc_command = BV_GPMI_ECCCTRL_ECC_CMD__BCH_DECODE; buffer_mask = BV_GPMI_ECCCTRL_BUFFER_MASK__BCH_PAGE | BV_GPMI_ECCCTRL_BUFFER_MASK__BCH_AUXONLY; pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(command_mode) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(address) | BF_GPMI_CTRL0_XFER_COUNT(geo->page_size); pio[1] = 0; pio[2] = BM_GPMI_ECCCTRL_ENABLE_ECC | BF_GPMI_ECCCTRL_ECC_CMD(ecc_command) | BF_GPMI_ECCCTRL_BUFFER_MASK(buffer_mask); pio[3] = geo->page_size; pio[4] = payload; pio[5] = auxiliary; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, ARRAY_SIZE(pio), DMA_TRANS_NONE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { pr_err("step 2 error\n"); return -1; } /* [3] Disable the BCH block */ command_mode = BV_GPMI_CTRL0_COMMAND_MODE__WAIT_FOR_READY; address = BV_GPMI_CTRL0_ADDRESS__NAND_DATA; pio[0] = BF_GPMI_CTRL0_COMMAND_MODE(command_mode) | BM_GPMI_CTRL0_WORD_LENGTH | BF_GPMI_CTRL0_CS(chip, this) | BF_GPMI_CTRL0_LOCK_CS(LOCK_CS_ENABLE, this) | BF_GPMI_CTRL0_ADDRESS(address) | BF_GPMI_CTRL0_XFER_COUNT(geo->page_size); pio[1] = 0; desc = channel->device->device_prep_slave_sg(channel, (struct scatterlist *)pio, 2, DMA_TRANS_NONE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { pr_err("step 3 error\n"); return -1; } /* [4] submit the DMA */ set_dma_type(this, DMA_FOR_READ_ECC_PAGE); return start_dma_with_bch_irq(this, desc); }