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Mon, 23 Nov 2020 01:30:36 -0500 (EST) From: Andrew Jeffery To: linux-mmc@vger.kernel.org Subject: [PATCH v3 1/3] mmc: sdhci-of-aspeed: Expose phase delay tuning Date: Mon, 23 Nov 2020 17:00:02 +1030 Message-Id: <20201123063004.337345-2-andrew@aj.id.au> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201123063004.337345-1-andrew@aj.id.au> References: <20201123063004.337345-1-andrew@aj.id.au> MIME-Version: 1.0 X-BeenThere: linux-aspeed@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux ASPEED SoC development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, ulf.hansson@linaro.org, linux-aspeed@lists.ozlabs.org, adrian.hunter@intel.com, linux-kernel@vger.kernel.org, robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org Errors-To: linux-aspeed-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linux-aspeed" The Aspeed SD/eMMC controllers feature up to two SDHCIs alongside a a set of "global" configuration registers. The global configuration registers house controller-specific settings that aren't exposed by the SDHCI, one example being a register for phase tuning. The phase tuning feature is new in the AST2600 design. It's exposed as a single register in the global register set and controls both the input and output phase adjustment for each slot. As the settings are slot-specific, the values to program are extracted from properties in the SDHCI devicetree nodes. Signed-off-by: Andrew Jeffery --- drivers/mmc/host/sdhci-of-aspeed.c | 275 ++++++++++++++++++++++++++++- 1 file changed, 267 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c index 4f008ba3280e..9fda2e7c1d78 100644 --- a/drivers/mmc/host/sdhci-of-aspeed.c +++ b/drivers/mmc/host/sdhci-of-aspeed.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -16,9 +17,19 @@ #include "sdhci-pltfm.h" -#define ASPEED_SDC_INFO 0x00 -#define ASPEED_SDC_S1MMC8 BIT(25) -#define ASPEED_SDC_S0MMC8 BIT(24) +#define ASPEED_SDC_INFO 0x00 +#define ASPEED_SDC_S1_MMC8 BIT(25) +#define ASPEED_SDC_S0_MMC8 BIT(24) +#define ASPEED_SDC_PHASE 0xf4 +#define ASPEED_SDC_S1_PHASE_IN GENMASK(25, 21) +#define ASPEED_SDC_S0_PHASE_IN GENMASK(20, 16) +#define ASPEED_SDC_S1_PHASE_OUT GENMASK(15, 11) +#define ASPEED_SDC_S1_PHASE_IN_EN BIT(10) +#define ASPEED_SDC_S1_PHASE_OUT_EN GENMASK(9, 8) +#define ASPEED_SDC_S0_PHASE_OUT GENMASK(7, 3) +#define ASPEED_SDC_S0_PHASE_IN_EN BIT(2) +#define ASPEED_SDC_S0_PHASE_OUT_EN GENMASK(1, 0) +#define ASPEED_SDC_PHASE_MAX 31 struct aspeed_sdc { struct clk *clk; @@ -28,9 +39,42 @@ struct aspeed_sdc { void __iomem *regs; }; +struct aspeed_sdhci_tap_param { + bool set; + +#define ASPEED_SDHCI_TAP_PARAM_INVERT_CLK BIT(4) + u8 in; + u8 out; +}; + +struct aspeed_sdhci_phase_tap_desc { + u32 tap_mask; + u32 enable_mask; + u8 enable_value; +}; + +struct aspeed_sdhci_phase_desc { + struct aspeed_sdhci_phase_tap_desc in; + struct aspeed_sdhci_phase_tap_desc out; +}; + +struct aspeed_sdhci_phase_param { + bool set; + u8 in_deg; + u8 out_deg; +}; + +struct aspeed_sdhci_pdata { + const struct aspeed_sdhci_phase_desc *phase_desc; + size_t nr_phase_descs; +}; + struct aspeed_sdhci { + const struct aspeed_sdhci_pdata *pdata; struct aspeed_sdc *parent; u32 width_mask; + const struct aspeed_sdhci_phase_desc *phase_desc; + struct aspeed_sdhci_phase_param phase_param[MMC_TIMING_MMC_HS200 + 1]; }; static void aspeed_sdc_configure_8bit_mode(struct aspeed_sdc *sdc, @@ -50,10 +94,119 @@ static void aspeed_sdc_configure_8bit_mode(struct aspeed_sdc *sdc, spin_unlock(&sdc->lock); } +static u32 +aspeed_sdc_set_phase_tap(const struct aspeed_sdhci_phase_tap_desc *desc, + u8 tap, bool enable, u32 reg) +{ + reg &= ~(desc->enable_mask | desc->tap_mask); + if (enable) { + reg |= tap << __ffs(desc->tap_mask); + reg |= desc->enable_value << __ffs(desc->enable_mask); + } + + return reg; +} + +static void +aspeed_sdc_set_phase_taps(struct aspeed_sdc *sdc, + const struct aspeed_sdhci_phase_desc *desc, + const struct aspeed_sdhci_tap_param *taps) +{ + u32 reg; + + spin_lock(&sdc->lock); + reg = readl(sdc->regs + ASPEED_SDC_PHASE); + + reg = aspeed_sdc_set_phase_tap(&desc->in, taps->in, taps->set, reg); + reg = aspeed_sdc_set_phase_tap(&desc->out, taps->out, taps->set, reg); + + writel(reg, sdc->regs + ASPEED_SDC_PHASE); + spin_unlock(&sdc->lock); +} + +#define PICOSECONDS_PER_SECOND 1000000000000ULL +#define ASPEED_SDHCI_NR_TAPS 15 +/* Measured value with *handwave* environmentals and static loading */ +#define ASPEED_SDHCI_MAX_TAP_DELAY_PS 1253 +static int aspeed_sdhci_phase_to_tap(struct sdhci_host *host, + unsigned long rate_hz, int phase_deg) +{ + u64 phase_period_ps; + struct device *dev; + u64 prop_delay_ps; + u64 clk_period_ps; + unsigned int taps; + u8 inverted; + + dev = host->mmc->parent; + + phase_deg %= 360; + + if (phase_deg >= 180) { + inverted = ASPEED_SDHCI_TAP_PARAM_INVERT_CLK; + phase_deg -= 180; + dev_dbg(dev, + "Inverting clock to reduce phase correction from %d to %d degrees\n", + phase_deg + 180, phase_deg); + } else { + inverted = 0; + } + + prop_delay_ps = ASPEED_SDHCI_MAX_TAP_DELAY_PS / ASPEED_SDHCI_NR_TAPS; + clk_period_ps = div_u64(PICOSECONDS_PER_SECOND, (u64)rate_hz); + phase_period_ps = div_u64((u64)phase_deg * clk_period_ps, 360ULL); + + taps = div_u64(phase_period_ps, prop_delay_ps); + if (taps > ASPEED_SDHCI_NR_TAPS) { + dev_warn(dev, + "Requested out of range phase tap %d for %d degrees of phase compensation at %luHz, clamping to tap %d\n", + taps, phase_deg, rate_hz, ASPEED_SDHCI_NR_TAPS); + taps = ASPEED_SDHCI_NR_TAPS; + } + + return inverted | taps; +} + +static void +aspeed_sdhci_phases_to_taps(struct sdhci_host *host, unsigned long rate, + const struct aspeed_sdhci_phase_param *phases, + struct aspeed_sdhci_tap_param *taps) +{ + taps->set = phases->set; + + if (!phases->set) + return; + + taps->in = aspeed_sdhci_phase_to_tap(host, rate, phases->in_deg); + taps->out = aspeed_sdhci_phase_to_tap(host, rate, phases->out_deg); +} + +static void +aspeed_sdhci_configure_phase(struct sdhci_host *host, unsigned long rate) +{ + struct aspeed_sdhci_tap_param _taps = {0}, *taps = &_taps; + struct aspeed_sdhci_phase_param *phases; + struct aspeed_sdhci *sdhci; + + sdhci = sdhci_pltfm_priv(sdhci_priv(host)); + + if (!sdhci->phase_desc) + return; + + phases = &sdhci->phase_param[host->timing]; + aspeed_sdhci_phases_to_taps(host, rate, phases, taps); + aspeed_sdc_set_phase_taps(sdhci->parent, sdhci->phase_desc, taps); + dev_dbg(host->mmc->parent, + "Using taps [%d, %d] for [%d, %d] degrees of phase correction at %luHz (%d)\n", + taps->in & ASPEED_SDHCI_NR_TAPS, + taps->out & ASPEED_SDHCI_NR_TAPS, + phases->in_deg, phases->out_deg, rate, host->timing); +} + static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) { struct sdhci_pltfm_host *pltfm_host; - unsigned long parent; + unsigned long parent, bus; int div; u16 clk; @@ -69,13 +222,17 @@ static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) clock = host->max_clk; for (div = 2; div < 256; div *= 2) { - if ((parent / div) <= clock) + bus = parent / div; + if (bus <= clock) break; } + div >>= 1; clk = div << SDHCI_DIVIDER_SHIFT; + aspeed_sdhci_configure_phase(host, bus); + sdhci_enable_clk(host, clk); } @@ -155,8 +312,60 @@ static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev, return (delta / 0x100) - 1; } +static void +aspeed_sdhci_of_parse_phase(struct device_node *np, const char *prop, + struct aspeed_sdhci_phase_param *phase) +{ + int degrees[2] = {0}; + int rc; + + rc = of_property_read_variable_u32_array(np, prop, degrees, 2, 0); + phase->set = rc == 2; + if (phase->set) { + phase->in_deg = degrees[0]; + phase->out_deg = degrees[1]; + } +} + +static int aspeed_sdhci_of_parse(struct platform_device *pdev, + struct aspeed_sdhci *sdhci) +{ + struct device_node *np; + struct device *dev; + + if (!sdhci->phase_desc) + return 0; + + dev = &pdev->dev; + np = dev->of_node; + + aspeed_sdhci_of_parse_phase(np, "clk-phase-legacy", + &sdhci->phase_param[MMC_TIMING_LEGACY]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-mmc-hs", + &sdhci->phase_param[MMC_TIMING_MMC_HS]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-sd-hs", + &sdhci->phase_param[MMC_TIMING_SD_HS]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-uhs-sdr12", + &sdhci->phase_param[MMC_TIMING_UHS_SDR12]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-uhs-sdr25", + &sdhci->phase_param[MMC_TIMING_UHS_SDR25]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-uhs-sdr50", + &sdhci->phase_param[MMC_TIMING_UHS_SDR50]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-uhs-sdr104", + &sdhci->phase_param[MMC_TIMING_UHS_SDR104]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-uhs-ddr50", + &sdhci->phase_param[MMC_TIMING_UHS_DDR50]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-mmc-ddr52", + &sdhci->phase_param[MMC_TIMING_MMC_DDR52]); + aspeed_sdhci_of_parse_phase(np, "clk-phase-mmc-hs200", + &sdhci->phase_param[MMC_TIMING_MMC_HS200]); + + return 0; +} + static int aspeed_sdhci_probe(struct platform_device *pdev) { + const struct aspeed_sdhci_pdata *aspeed_pdata; struct sdhci_pltfm_host *pltfm_host; struct aspeed_sdhci *dev; struct sdhci_host *host; @@ -164,12 +373,15 @@ static int aspeed_sdhci_probe(struct platform_device *pdev) int slot; int ret; + aspeed_pdata = of_device_get_match_data(&pdev->dev); + host = sdhci_pltfm_init(pdev, &aspeed_sdhci_pdata, sizeof(*dev)); if (IS_ERR(host)) return PTR_ERR(host); pltfm_host = sdhci_priv(host); dev = sdhci_pltfm_priv(pltfm_host); + dev->pdata = aspeed_pdata; dev->parent = dev_get_drvdata(pdev->dev.parent); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -180,8 +392,17 @@ static int aspeed_sdhci_probe(struct platform_device *pdev) else if (slot >= 2) return -EINVAL; - dev_info(&pdev->dev, "Configuring for slot %d\n", slot); - dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8; + if (dev->pdata && slot < dev->pdata->nr_phase_descs) { + dev->phase_desc = &dev->pdata->phase_desc[slot]; + } else { + dev_info(&pdev->dev, + "Phase control not supported for slot %d\n", slot); + dev->phase_desc = NULL; + } + + dev->width_mask = !slot ? ASPEED_SDC_S0_MMC8 : ASPEED_SDC_S1_MMC8; + + dev_info(&pdev->dev, "Configured for slot %d\n", slot); sdhci_get_of_property(pdev); @@ -195,6 +416,10 @@ static int aspeed_sdhci_probe(struct platform_device *pdev) goto err_pltfm_free; } + ret = aspeed_sdhci_of_parse(pdev, dev); + if (ret) + goto err_sdhci_add; + ret = mmc_of_parse(host->mmc); if (ret) goto err_sdhci_add; @@ -230,10 +455,44 @@ static int aspeed_sdhci_remove(struct platform_device *pdev) return 0; } +static const struct aspeed_sdhci_phase_desc ast2600_sdhci_phase[] = { + /* SDHCI/Slot 0 */ + [0] = { + .in = { + .tap_mask = ASPEED_SDC_S0_PHASE_IN, + .enable_mask = ASPEED_SDC_S0_PHASE_IN_EN, + .enable_value = 1, + }, + .out = { + .tap_mask = ASPEED_SDC_S0_PHASE_OUT, + .enable_mask = ASPEED_SDC_S0_PHASE_OUT_EN, + .enable_value = 3, + }, + }, + /* SDHCI/Slot 1 */ + [1] = { + .in = { + .tap_mask = ASPEED_SDC_S1_PHASE_IN, + .enable_mask = ASPEED_SDC_S1_PHASE_IN_EN, + .enable_value = 1, + }, + .out = { + .tap_mask = ASPEED_SDC_S1_PHASE_OUT, + .enable_mask = ASPEED_SDC_S1_PHASE_OUT_EN, + .enable_value = 3, + }, + }, +}; + +static const struct aspeed_sdhci_pdata ast2600_sdhci_pdata = { + .phase_desc = ast2600_sdhci_phase, + .nr_phase_descs = ARRAY_SIZE(ast2600_sdhci_phase), +}; + static const struct of_device_id aspeed_sdhci_of_match[] = { { .compatible = "aspeed,ast2400-sdhci", }, { .compatible = "aspeed,ast2500-sdhci", }, - { .compatible = "aspeed,ast2600-sdhci", }, + { .compatible = "aspeed,ast2600-sdhci", .data = &ast2600_sdhci_pdata, }, { } };