Re: [PATCH RFC v3] mmc: sdhci-msm: Add support for MSM chipsets

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Hi Ivan,

On 08/23/2013 10:34 AM, Ivan T. Ivanov wrote:
Hi Georgi,

On Tue, 2013-08-20 at 19:44 +0300, Georgi Djakov wrote:
This platform driver adds the support of Secure Digital Host
Controller Interface compliant controller in MSM chipsets.

CC: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
CC: Venkat Gopalakrishnan <venkatg@xxxxxxxxxxxxxx>
CC: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>
CC: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
Signed-off-by: Georgi Djakov <gdjakov@xxxxxxxxxx>
---
Changes from v2:
- Added DT bindings for clocks
- Moved voltage regulators data to platform data
- Removed unneeded includes
- Removed obsolete and wrapper functions
- Removed error checking where unnecessary
- Removed redundant _clk suffix from clock names
- Just return instead of goto where possible
- Minor fixes


Is this version intermediate step before you address
all previous comments?


+
+static const struct of_device_id sdhci_msm_dt_match[] = {
+	{.compatible = "qcom,sdhci-msm"},

Missing termination entry

+};
+
+MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);
+
+static int sdhci_msm_probe(struct platform_device *pdev)
+{
+	struct sdhci_host *host;
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_msm_host *msm_host;
+	struct resource *core_memres = NULL;
+	int ret = 0, dead = 0;
+	struct pinctrl	*pinctrl;
+
+	msm_host = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_msm_host),
+				GFP_KERNEL);
+	if (!msm_host)
+		return -ENOMEM;
+
+	host = sdhci_pltfm_init(pdev, &msm_host->sdhci_msm_pdata, 0);
+	if (IS_ERR(host)) {
+		dev_err(mmc_dev(host->mmc), "sdhci_pltfm_init error\n");
+		return PTR_ERR(host);
+	}
+
+	pltfm_host = sdhci_priv(host);
+	pltfm_host->priv = msm_host;
+	msm_host->mmc = host->mmc;
+	msm_host->pdev = pdev;
+
+	ret = mmc_of_parse(host->mmc);
+	if (ret)

Shouldn't sdhci_pltfm_init operation be reverted?

+		return ret;
+
+	/* Extract platform data */
+	if (pdev->dev.of_node) {
+		msm_host->pdata = sdhci_msm_populate_pdata(&pdev->dev);
+		if (!msm_host->pdata) {
+			dev_err(&pdev->dev, "DT parsing error\n");
+			goto pltfm_free;
+		}
+	} else {
+		dev_err(&pdev->dev, "No device tree node\n");
+		goto pltfm_free;
+	}
+
+	/* Setup pins */
+	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+	if (IS_ERR(pinctrl))
+		dev_warn(&pdev->dev, "pins are not configured by the driver\n");
+
+	/* Setup Clocks */
+
+	/* Setup SDCC bus voter clock. */
+	msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus");
+	if (!IS_ERR_OR_NULL(msm_host->bus_clk)) {
+		/* Vote for max. clk rate for max. performance */
+		ret = clk_set_rate(msm_host->bus_clk, INT_MAX);
+		if (ret)
+			goto pltfm_free;
+		ret = clk_prepare_enable(msm_host->bus_clk);
+		if (ret)
+			goto pltfm_free;
+	}
+
+	/* Setup main peripheral bus clock */
+	msm_host->pclk = devm_clk_get(&pdev->dev, "iface");
+	if (!IS_ERR(msm_host->pclk)) {
+		ret = clk_prepare_enable(msm_host->pclk);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Main peripheral clock setup failed (%d)\n",
+				ret);
+			goto bus_clk_disable;
+		}
+	}
+
+	/* Setup SDC MMC clock */
+	msm_host->clk = devm_clk_get(&pdev->dev, "core");
+	if (IS_ERR(msm_host->clk)) {
+		ret = PTR_ERR(msm_host->clk);
+		dev_err(&pdev->dev, "SDC MMC clock setup failed (%d)\n", ret);
+		goto pclk_disable;
+	}
+
+	ret = clk_prepare_enable(msm_host->clk);
+	if (ret)
+		goto pclk_disable;
+
+	/* Setup regulators */
+	ret = sdhci_msm_vreg_init(&pdev->dev, msm_host->pdata, true);
+	if (ret) {
+		dev_err(&pdev->dev, "Regulator setup failed (%d)\n", ret);
+		goto clk_disable;
+	}
+
+	/* Reset the core and Enable SDHC mode */
+	core_memres = platform_get_resource_byname(pdev,
+						   IORESOURCE_MEM, "core_mem");
+	msm_host->core_mem = devm_ioremap(&pdev->dev, core_memres->start,
+					  resource_size(core_memres));
+
+	if (!msm_host->core_mem) {
+		dev_err(&pdev->dev, "Failed to remap registers\n");
+		ret = -ENOMEM;
+		goto vreg_deinit;
+	}
+
+	/* Set SW_RST bit in POWER register (Offset 0x0) */
+	writel_relaxed(CORE_SW_RST, msm_host->core_mem + CORE_POWER);
+	/* Set HC_MODE_EN bit in HC_MODE register */
+	writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));
+
+	/*
+	 * Following are the deviations from SDHC spec v3.0 -
+	 * 1. Card detection is handled using separate GPIO.
+	 * 2. Bus power control is handled by interacting with PMIC.
+	 */
+	host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
+
+	/* Setup PWRCTL irq */
+	msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq");
+	if (msm_host->pwr_irq < 0) {
+		dev_err(&pdev->dev, "Failed to get pwr_irq by name (%d)\n",
+			msm_host->pwr_irq);
+		goto vreg_deinit;
+	}
+	ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL,
+					sdhci_msm_pwr_irq, IRQF_ONESHOT,
+					dev_name(&pdev->dev), host);
+	if (ret) {
+		dev_err(&pdev->dev, "Request threaded irq(%d) failed (%d)\n",
+			msm_host->pwr_irq, ret);
+		goto vreg_deinit;
+	}
+
+	/* Enable pwr irq interrupts */
+	writel_relaxed(INT_MASK, (msm_host->core_mem + CORE_PWRCTL_MASK));
+
+	/* Set host capabilities */
+	msm_host->mmc->caps |= msm_host->pdata->caps;
+	msm_host->mmc->caps2 |= msm_host->pdata->caps2;
+
+	ret = sdhci_add_host(host);
+	if (ret) {
+		dev_err(&pdev->dev, "Add host failed (%d)\n", ret);
+		goto vreg_deinit;
+	}
+
+	/* Set core clk rate */
+	ret = clk_set_rate(msm_host->clk, host->max_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "MClk rate set failed (%d)\n", ret);
+		goto remove_host;
+	}
+
+	host->mmc->max_current_180 = host->mmc->max_current_300 =
+	host->mmc->max_current_330 = sdhci_msm_get_vdd_max_current(msm_host);
+
+	/* Successful initialization */
+	goto out;
+
+remove_host:
+	dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
+	sdhci_remove_host(host, dead);
+vreg_deinit:
+	sdhci_msm_vreg_init(&pdev->dev, msm_host->pdata, false);
+clk_disable:
+	if (!IS_ERR(msm_host->clk))
+		clk_disable_unprepare(msm_host->clk);
+pclk_disable:
+	if (!IS_ERR(msm_host->pclk))
+		clk_disable_unprepare(msm_host->pclk);
+bus_clk_disable:
+	if (!IS_ERR_OR_NULL(msm_host->bus_clk))
+		clk_disable_unprepare(msm_host->bus_clk);
+pltfm_free:
+	sdhci_pltfm_free(pdev);
+out:
+	return ret;
+}
+

<snip>

+
+static struct platform_driver sdhci_msm_driver = {
+	.probe = sdhci_msm_probe,
+	.remove = sdhci_msm_remove,
+	.driver = {
+		   .name = "sdhci_msm",
+		   .owner = THIS_MODULE,
+		   .of_match_table = of_match_ptr(sdhci_msm_dt_match),

of_match_ptr is not really required.


Thank you for the additional comments. I'll address all issues in the next version.

BR,
Georgi

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