diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-nomadik.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c index 650293ff4d62..9f1423ac7b3b 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -106,6 +106,16 @@ /* maximum threshold value */ #define MAX_I2C_FIFO_THRESHOLD 15 +/** + * struct i2c_vendor_data - per-vendor variations + * @has_mtdws: variant has the MTDWS bit + * @fifodepth: variant FIFO depth + */ +struct i2c_vendor_data { + bool has_mtdws; + u32 fifodepth; +}; + enum i2c_status { I2C_NOP, I2C_ON_GOING, @@ -138,6 +148,7 @@ struct i2c_nmk_client { /** * struct nmk_i2c_dev - private data structure of the controller. + * @vendor: vendor data for this variant. * @adev: parent amba device. * @adap: corresponding I2C adapter. * @irq: interrupt line for the controller. @@ -155,6 +166,7 @@ struct i2c_nmk_client { * @busy: Busy doing transfer. */ struct nmk_i2c_dev { + struct i2c_vendor_data *vendor; struct amba_device *adev; struct i2c_adapter adap; int irq; @@ -431,7 +443,7 @@ static int read_i2c(struct nmk_i2c_dev *dev, u16 flags) irq_mask = (I2C_IT_RXFNF | I2C_IT_RXFF | I2C_IT_MAL | I2C_IT_BERR); - if (dev->stop) + if (dev->stop || !dev->vendor->has_mtdws) irq_mask |= I2C_IT_MTD; else irq_mask |= I2C_IT_MTDWS; @@ -511,7 +523,7 @@ static int write_i2c(struct nmk_i2c_dev *dev, u16 flags) * set the MTDWS bit (Master Transaction Done Without Stop) * to start repeated start operation */ - if (dev->stop) + if (dev->stop || !dev->vendor->has_mtdws) irq_mask |= I2C_IT_MTD; else irq_mask |= I2C_IT_MTDWS; @@ -978,6 +990,8 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) struct device_node *np = adev->dev.of_node; struct nmk_i2c_dev *dev; struct i2c_adapter *adap; + struct i2c_vendor_data *vendor = id->data; + u32 max_fifo_threshold = (vendor->fifodepth / 2) - 1; if (!pdata) { if (np) { @@ -994,12 +1008,25 @@ static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id) pdata = &u8500_i2c; } + if (pdata->tft > max_fifo_threshold) { + dev_warn(&adev->dev, "requested TX FIFO threshold %u, adjusted down to %u\n", + pdata->tft, max_fifo_threshold); + pdata->tft = max_fifo_threshold; + } + + if (pdata->rft > max_fifo_threshold) { + dev_warn(&adev->dev, "requested RX FIFO threshold %u, adjusted down to %u\n", + pdata->rft, max_fifo_threshold); + pdata->rft = max_fifo_threshold; + } + dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL); if (!dev) { dev_err(&adev->dev, "cannot allocate memory\n"); ret = -ENOMEM; goto err_no_mem; } + dev->vendor = vendor; dev->busy = false; dev->adev = adev; amba_set_drvdata(adev, dev); @@ -1134,14 +1161,26 @@ static int nmk_i2c_remove(struct amba_device *adev) return 0; } +static struct i2c_vendor_data vendor_stn8815 = { + .has_mtdws = false, + .fifodepth = 16, /* Guessed from TFTR/RFTR = 7 */ +}; + +static struct i2c_vendor_data vendor_db8500 = { + .has_mtdws = true, + .fifodepth = 32, /* Guessed from TFTR/RFTR = 15 */ +}; + static struct amba_id nmk_i2c_ids[] = { { .id = 0x00180024, .mask = 0x00ffffff, + .data = &vendor_stn8815, }, { .id = 0x00380024, .mask = 0x00ffffff, + .data = &vendor_db8500, }, {}, }; |