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Message-ID: <dfe6c97a-6383-c697-88e5-279f6ca8136e@ti.com>
Date: Wed, 5 Dec 2018 20:37:06 +0530
From: Faiz Abbas <faiz_abbas@...com>
To: Adrian Hunter <adrian.hunter@...el.com>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-mmc@...r.kernel.org>
CC: <ulf.hansson@...aro.org>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <michal.simek@...inx.com>, <kishon@...com>
Subject: Re: [PATCH 3/3] mmc: sdhci_am654: Add Initial Support for AM654 SDHCI
driver
Hi Adrian,
On 05/12/18 7:12 PM, Adrian Hunter wrote:
> On 29/11/18 6:15 PM, Faiz Abbas wrote:
>> The host controllers on TI's AM654 SOCs are not compatible with
>> the phy and consumer model of the sdhci-of-arasan driver. It turns out
>> that for optimal operation at higher speeds, a special tuning procedure
>> needs to be implemented which involves configuration of platform
>> specific phy registers.
>>
>> Therefore, branch out to a new sdhci_am654 driver and add the phy
>> register space with all phy configurations to it. Populate AM654
>> specific callbacks to sdhci_ops and add SDHCI_QUIRKS wherever
>> applicable.
>>
>> Only add support for upto High Speed for SD card and upto DDR52 speed
>> mode for eMMC. Higher speeds will be added in subsequent patches.
>>
...
>> + sdhci_am654->dll_on = true;
>> + }
>> +}
>> +
>> +
>
> Double blank line
Will fix.
>
>> +static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode,
>> + unsigned short vdd)
>> +{
>> + if (!IS_ERR(host->mmc->supply.vmmc)) {
>> + struct mmc_host *mmc = host->mmc;
>> +
>> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
>> + }
>> + sdhci_set_power_noreg(host, mode, vdd);
>> +}
>> +
>> +struct sdhci_ops sdhci_am654_ops = {
>> + .get_max_clock = sdhci_pltfm_clk_get_max_clock,
>> + .get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
>> + .set_uhs_signaling = sdhci_set_uhs_signaling,
>> + .set_bus_width = sdhci_set_bus_width,
>> + .set_power = sdhci_am654_set_power,
>> + .set_clock = sdhci_am654_set_clock,
>> + .reset = sdhci_reset,
>> +};
>> +
>> +static const struct sdhci_pltfm_data sdhci_am654_pdata = {
>> + .ops = &sdhci_am654_ops,
>> + .quirks = SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
>> + SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
>> + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
>> +};
>> +
>> +static int sdhci_am654_init(struct sdhci_host *host)
>> +{
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
>> + u32 ctl_cfg_2 = 0;
>> + u32 val;
>> + int ret;
>> +
>> + regmap_read(sdhci_am654->base, PHY_STAT1, &val);
>> + if (~val & CALDONE_MASK) {
>> + /* Calibrate IO lines */
>> + regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
>> + PDB_MASK, PDB_MASK);
>> + ret = regmap_read_poll_timeout(sdhci_am654->base, PHY_STAT1,
>> + val, val & CALDONE_MASK, 1, 20);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + /* Enable pins by setting IO mux to 0 */
>> + regmap_update_bits(sdhci_am654->base, PHY_CTRL1,
>> + IOMUX_ENABLE_MASK, 0);
>> +
>> + /* Set slot type based on SD or eMMC */
>> + if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
>> + ctl_cfg_2 = SLOTTYPE_EMBEDDED;
>> +
>> + regmap_update_bits(sdhci_am654->base, CTL_CFG_2,
>> + ctl_cfg_2, SLOTTYPE_MASK);
>> +
>> + return sdhci_add_host(host);
>> +}
>> +
>> +static int sdhci_am654_get_of_property(struct platform_device *pdev,
>> + struct sdhci_am654_data *sdhci_am654)
>> +{
>> + struct device *dev = &pdev->dev;
>> + int drv_strength;
>> + int ret;
>> +
>> + ret = device_property_read_u32(dev, "ti,trm-icp",
>> + &sdhci_am654->trm_icp);
>> + if (ret)
>> + return ret;
>> +
>> + ret = device_property_read_u32(dev, "ti,otap-del-sel",
>> + &sdhci_am654->otap_del_sel);
>> + if (ret)
>> + return ret;
>> +
>> + ret = device_property_read_u32(dev, "ti,driver-strength-ohm",
>> + &drv_strength);
>> + if (ret)
>> + return ret;
>> +
>> + switch (drv_strength) {
>> + case 50:
>> + sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM;
>> + break;
>> + case 33:
>> + sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM;
>> + break;
>> + case 66:
>> + sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM;
>> + break;
>> + case 100:
>> + sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM;
>> + break;
>> + case 40:
>> + sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM;
>> + break;
>> + default:
>> + dev_err(dev, "Invalid driver strength\n");
>> + return -EINVAL;
>> + }
>> +
>> + sdhci_get_of_property(pdev);
>> +
>> + return 0;
>> +}
>> +
>> +static int sdhci_am654_probe(struct platform_device *pdev)
>> +{
>> + struct sdhci_pltfm_host *pltfm_host;
>> + struct sdhci_am654_data *sdhci_am654;
>> + struct sdhci_host *host;
>> + struct resource *res;
>> + struct clk *clk_xin;
>> + struct device *dev = &pdev->dev;
>> + void __iomem *base;
>> + int ret;
>> +
>> + host = sdhci_pltfm_init(pdev, &sdhci_am654_pdata, sizeof(*sdhci_am654));
>> + if (IS_ERR(host))
>> + return PTR_ERR(host);
>> +
>> + pltfm_host = sdhci_priv(host);
>> + sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
>> +
>> + clk_xin = devm_clk_get(dev, "clk_xin");
>> + if (IS_ERR(clk_xin)) {
>> + dev_err(dev, "clk_xin clock not found.\n");
>> + ret = PTR_ERR(clk_xin);
>> + goto err_pltfm_free;
>> + }
>> +
>> + sdhci_am654->clk_ahb = devm_clk_get(dev, "clk_ahb");
>> + if (IS_ERR(sdhci_am654->clk_ahb)) {
>> + dev_err(dev, "clk_ahb clock not found.\n");
>> + ret = PTR_ERR(sdhci_am654->clk_ahb);
>> + goto err_pltfm_free;
>> + }
>
> Did you intend not to enable clks?
Yes. Clocks get enabled as a part of pm_runtime calls.
>
>> +
>> + pltfm_host->clk = clk_xin;
>> +
>> + pm_runtime_enable(dev);
>> + ret = pm_runtime_get_sync(dev);
>> + if (ret > 0) {
>
> Did you intend 'ret > 0'?
Sorry. That was intended to be < 0.
Thanks,
Faiz
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