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author | Brian Norris <computersforpeace@gmail.com> | 2015-05-12 21:09:28 +0200 |
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committer | Brian Norris <computersforpeace@gmail.com> | 2015-05-15 22:19:59 +0200 |
commit | c26211d37f11d5913d9803fdede6d053f918ba7b (patch) | |
tree | 95d49e14e396caf442e8c196ffa216cc757ab3b8 /drivers/mtd | |
parent | Documentation: devicetree: brcmstb_nand: add BCM63138 and Cygnus/iProc (diff) | |
download | linux-c26211d37f11d5913d9803fdede6d053f918ba7b.tar.xz linux-c26211d37f11d5913d9803fdede6d053f918ba7b.zip |
mtd: brcmnand: add extra SoC support to library
There are a few small hooks required for chips like BCM63138 and the
iProc family. Let's introduce those now.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/nand/brcmnand/brcmnand.c | 61 | ||||
-rw-r--r-- | drivers/mtd/nand/brcmnand/brcmnand.h | 15 |
2 files changed, 71 insertions, 5 deletions
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c index fb81aac8d4ef..a780768fe5e0 100644 --- a/drivers/mtd/nand/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/brcmnand/brcmnand.c @@ -119,6 +119,9 @@ struct brcmnand_controller { unsigned int dma_irq; int nand_version; + /* Some SoCs provide custom interrupt status register(s) */ + struct brcmnand_soc *soc; + int cmd_pending; bool dma_pending; struct completion done; @@ -965,6 +968,17 @@ static irqreturn_t brcmnand_ctlrdy_irq(int irq, void *data) return IRQ_HANDLED; } +/* Handle SoC-specific interrupt hardware */ +static irqreturn_t brcmnand_irq(int irq, void *data) +{ + struct brcmnand_controller *ctrl = data; + + if (ctrl->soc->ctlrdy_ack(ctrl->soc)) + return brcmnand_ctlrdy_irq(irq, data); + + return IRQ_NONE; +} + static irqreturn_t brcmnand_dma_irq(int irq, void *data) { struct brcmnand_controller *ctrl = data; @@ -1153,12 +1167,18 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command, if (native_cmd == CMD_PARAMETER_READ || native_cmd == CMD_PARAMETER_CHANGE_COL) { int i; + + brcmnand_soc_data_bus_prepare(ctrl->soc); + /* * Must cache the FLASH_CACHE now, since changes in * SECTOR_SIZE_1K may invalidate it */ for (i = 0; i < FC_WORDS; i++) ctrl->flash_cache[i] = brcmnand_read_fc(ctrl, i); + + brcmnand_soc_data_bus_unprepare(ctrl->soc); + /* Cleanup from HW quirk: restore SECTOR_SIZE_1K */ if (host->hwcfg.sector_size_1k) brcmnand_set_sector_size_1k(host, @@ -1371,10 +1391,15 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip, brcmnand_send_cmd(host, CMD_PAGE_READ); brcmnand_waitfunc(mtd, chip); - if (likely(buf)) + if (likely(buf)) { + brcmnand_soc_data_bus_prepare(ctrl->soc); + for (j = 0; j < FC_WORDS; j++, buf++) *buf = brcmnand_read_fc(ctrl, j); + brcmnand_soc_data_bus_unprepare(ctrl->soc); + } + if (oob) oob += read_oob_from_regs(ctrl, i, oob, mtd->oobsize / trans, @@ -1546,12 +1571,17 @@ static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip, lower_32_bits(addr)); (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS); - if (buf) + if (buf) { + brcmnand_soc_data_bus_prepare(ctrl->soc); + for (j = 0; j < FC_WORDS; j++, buf++) brcmnand_write_fc(ctrl, j, *buf); - else if (oob) + + brcmnand_soc_data_bus_unprepare(ctrl->soc); + } else if (oob) { for (j = 0; j < FC_WORDS; j++) brcmnand_write_fc(ctrl, j, 0xffffffff); + } if (oob) { oob += write_oob_to_regs(ctrl, i, oob, @@ -1995,6 +2025,11 @@ static int brcmnand_resume(struct device *dev) brcmnand_write_reg(ctrl, BRCMNAND_CS_XOR, ctrl->nand_cs_nand_xor); brcmnand_write_reg(ctrl, BRCMNAND_CORR_THRESHOLD, ctrl->corr_stat_threshold); + if (ctrl->soc) { + /* Clear/re-enable interrupt */ + ctrl->soc->ctlrdy_ack(ctrl->soc); + ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true); + } list_for_each_entry(host, &ctrl->host_list, node) { struct mtd_info *mtd = &host->mtd; @@ -2139,8 +2174,24 @@ int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc) return -ENODEV; } - ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0, - DRV_NAME, ctrl); + /* + * Some SoCs integrate this controller (e.g., its interrupt bits) in + * interesting ways + */ + if (soc) { + ctrl->soc = soc; + + ret = devm_request_irq(dev, ctrl->irq, brcmnand_irq, 0, + DRV_NAME, ctrl); + + /* Enable interrupt */ + ctrl->soc->ctlrdy_ack(ctrl->soc); + ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true); + } else { + /* Use standard interrupt infrastructure */ + ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0, + DRV_NAME, ctrl); + } if (ret < 0) { dev_err(dev, "can't allocate IRQ %d: error %d\n", ctrl->irq, ret); diff --git a/drivers/mtd/nand/brcmnand/brcmnand.h b/drivers/mtd/nand/brcmnand/brcmnand.h index 5118b29555f0..a20c73630b7b 100644 --- a/drivers/mtd/nand/brcmnand/brcmnand.h +++ b/drivers/mtd/nand/brcmnand/brcmnand.h @@ -23,8 +23,23 @@ struct dev_pm_ops; struct brcmnand_soc { struct platform_device *pdev; void *priv; + bool (*ctlrdy_ack)(struct brcmnand_soc *soc); + void (*ctlrdy_set_enabled)(struct brcmnand_soc *soc, bool en); + void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare); }; +static inline void brcmnand_soc_data_bus_prepare(struct brcmnand_soc *soc) +{ + if (soc && soc->prepare_data_bus) + soc->prepare_data_bus(soc, true); +} + +static inline void brcmnand_soc_data_bus_unprepare(struct brcmnand_soc *soc) +{ + if (soc && soc->prepare_data_bus) + soc->prepare_data_bus(soc, false); +} + static inline u32 brcmnand_readl(void __iomem *addr) { /* |