diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-rcar.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-rcar.c | 51 |
1 files changed, 34 insertions, 17 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 829ac053bb..828aa2ea0f 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -89,6 +89,7 @@ #define TMDMAE BIT(0) /* DMA Master Transmitted Enable */ /* ICCCR2 */ +#define FMPE BIT(7) /* Fast Mode Plus Enable */ #define CDFD BIT(2) /* CDF Disable */ #define HLSE BIT(1) /* HIGH/LOW Separate Control Enable */ #define SME BIT(0) /* SCL Mask Enable */ @@ -122,16 +123,18 @@ #define ID_NACK BIT(4) #define ID_EPROTO BIT(5) /* persistent flags */ +#define ID_P_FMPLUS BIT(27) #define ID_P_NOT_ATOMIC BIT(28) #define ID_P_HOST_NOTIFY BIT(29) #define ID_P_NO_RXDMA BIT(30) /* HW forbids RXDMA sometimes */ #define ID_P_PM_BLOCKED BIT(31) -#define ID_P_MASK GENMASK(31, 28) +#define ID_P_MASK GENMASK(31, 27) enum rcar_i2c_type { I2C_RCAR_GEN1, I2C_RCAR_GEN2, I2C_RCAR_GEN3, + I2C_RCAR_GEN4, }; struct rcar_i2c_priv { @@ -148,6 +151,7 @@ struct rcar_i2c_priv { u32 icccr; u16 schd; u16 scld; + u8 smd; u8 recovery_icmcr; /* protected by adapter lock */ enum rcar_i2c_type devtype; struct i2c_client *slave; @@ -239,9 +243,14 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv) if (priv->devtype < I2C_RCAR_GEN3) { rcar_i2c_write(priv, ICCCR, priv->icccr); } else { - rcar_i2c_write(priv, ICCCR2, CDFD | HLSE | SME); + u32 icccr2 = CDFD | HLSE | SME; + + if (priv->flags & ID_P_FMPLUS) + icccr2 |= FMPE; + + rcar_i2c_write(priv, ICCCR2, icccr2); rcar_i2c_write(priv, ICCCR, priv->icccr); - rcar_i2c_write(priv, ICMPR, RCAR_DEFAULT_SMD); + rcar_i2c_write(priv, ICMPR, priv->smd); rcar_i2c_write(priv, ICHPR, priv->schd); rcar_i2c_write(priv, ICLPR, priv->scld); rcar_i2c_write(priv, ICFBSCR, TCYC17); @@ -278,6 +287,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv) /* Fall back to previously used values if not supplied */ i2c_parse_fw_timings(dev, &t, false); + priv->smd = RCAR_DEFAULT_SMD; /* * calculate SCL clock @@ -303,6 +313,11 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv) if (cdf >= 1U << cdf_width) goto err_no_val; + if (t.bus_freq_hz > I2C_MAX_FAST_MODE_FREQ && priv->devtype >= I2C_RCAR_GEN4) + priv->flags |= ID_P_FMPLUS; + else + priv->flags &= ~ID_P_FMPLUS; + /* On Gen3+, we use cdf only for the filters, not as a SCL divider */ ick = rate / (priv->devtype < I2C_RCAR_GEN3 ? (cdf + 1) : 1); @@ -344,30 +359,30 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv) * x as a base value for the SCLD/SCHD ratio: * * SCL = clkp / (8 + 2 * SMD + SCLD + SCHD + F[(ticf + tr + intd) * clkp]) - * SCL = clkp / (8 + 2 * RCAR_DEFAULT_SMD + RCAR_SCLD_RATIO * x + * SCL = clkp / (8 + 2 * SMD + RCAR_SCLD_RATIO * x * + RCAR_SCHD_RATIO * x + F[...]) * * with: sum_ratio = RCAR_SCLD_RATIO + RCAR_SCHD_RATIO - * and: smd = RCAR_DEFAULT_SMD * * SCL = clkp / (8 + 2 * smd + sum_ratio * x + F[...]) * 8 + 2 * smd + sum_ratio * x + F[...] = clkp / SCL * x = ((clkp / SCL) - 8 - 2 * smd - F[...]) / sum_ratio */ x = DIV_ROUND_UP(rate, t.bus_freq_hz ?: 1); - x = DIV_ROUND_UP(x - 8 - 2 * RCAR_DEFAULT_SMD - round, sum_ratio); - scl = rate / (8 + 2 * RCAR_DEFAULT_SMD + sum_ratio * x + round); + x = DIV_ROUND_UP(x - 8 - 2 * priv->smd - round, sum_ratio); + scl = rate / (8 + 2 * priv->smd + sum_ratio * x + round); - /* Bail out if values don't fit into 16 bit or SMD became too large */ - if (x * RCAR_SCLD_RATIO > 0xffff || RCAR_DEFAULT_SMD > x * RCAR_SCHD_RATIO) + if (x == 0 || x * RCAR_SCLD_RATIO > 0xffff) goto err_no_val; priv->icccr = cdf; priv->schd = RCAR_SCHD_RATIO * x; priv->scld = RCAR_SCLD_RATIO * x; + if (priv->smd >= priv->schd) + priv->smd = priv->schd - 1; - dev_dbg(dev, "clk %u/%u(%lu), round %u, CDF: %u SCHD %u SCLD %u\n", - scl, t.bus_freq_hz, rate, round, cdf, priv->schd, priv->scld); + dev_dbg(dev, "clk %u/%u(%lu), round %u, CDF: %u SCHD %u SCLD %u SMD %u\n", + scl, t.bus_freq_hz, rate, round, cdf, priv->schd, priv->scld, priv->smd); } return 0; @@ -431,8 +446,8 @@ static void rcar_i2c_cleanup_dma(struct rcar_i2c_priv *priv, bool terminate) dma_unmap_single(chan->device->dev, sg_dma_address(&priv->sg), sg_dma_len(&priv->sg), priv->dma_direction); - /* Gen3 can only do one RXDMA per transfer and we just completed it */ - if (priv->devtype == I2C_RCAR_GEN3 && + /* Gen3+ can only do one RXDMA per transfer and we just completed it */ + if (priv->devtype >= I2C_RCAR_GEN3 && priv->dma_direction == DMA_FROM_DEVICE) priv->flags |= ID_P_NO_RXDMA; @@ -886,8 +901,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, if (ret < 0) goto out; - /* Gen3 needs a reset before allowing RXDMA once */ - if (priv->devtype == I2C_RCAR_GEN3) { + /* Gen3+ needs a reset. That also allows RXDMA once */ + if (priv->devtype >= I2C_RCAR_GEN3) { priv->flags &= ~ID_P_NO_RXDMA; ret = rcar_i2c_do_reset(priv); if (ret) @@ -1072,10 +1087,12 @@ static const struct of_device_id rcar_i2c_dt_ids[] = { { .compatible = "renesas,i2c-r8a7794", .data = (void *)I2C_RCAR_GEN2 }, { .compatible = "renesas,i2c-r8a7795", .data = (void *)I2C_RCAR_GEN3 }, { .compatible = "renesas,i2c-r8a7796", .data = (void *)I2C_RCAR_GEN3 }, + /* S4 has no FM+ bit */ + { .compatible = "renesas,i2c-r8a779f0", .data = (void *)I2C_RCAR_GEN3 }, { .compatible = "renesas,rcar-gen1-i2c", .data = (void *)I2C_RCAR_GEN1 }, { .compatible = "renesas,rcar-gen2-i2c", .data = (void *)I2C_RCAR_GEN2 }, { .compatible = "renesas,rcar-gen3-i2c", .data = (void *)I2C_RCAR_GEN3 }, - { .compatible = "renesas,rcar-gen4-i2c", .data = (void *)I2C_RCAR_GEN3 }, + { .compatible = "renesas,rcar-gen4-i2c", .data = (void *)I2C_RCAR_GEN4 }, {}, }; MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids); @@ -1151,7 +1168,7 @@ static int rcar_i2c_probe(struct platform_device *pdev) if (of_property_read_bool(dev->of_node, "smbus")) priv->flags |= ID_P_HOST_NOTIFY; - if (priv->devtype == I2C_RCAR_GEN3) { + if (priv->devtype >= I2C_RCAR_GEN3) { priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); if (IS_ERR(priv->rstc)) { ret = PTR_ERR(priv->rstc); |