--- /dev/null
+/*
+ * SDHCI support for SiRF primaII and marco SoCs
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/mmc/slot-gpio.h>
+#include "sdhci-pltfm.h"
+
+#define SDHCI_CLK_DELAY_SETTING 0x4C
+#define SDHCI_SIRF_8BITBUS BIT(3)
+#define SIRF_TUNING_COUNT 128
+
+struct sdhci_sirf_priv {
+ int gpio_cd;
+};
+
+static void sdhci_sirf_set_bus_width(struct sdhci_host *host, int width)
+{
+ u8 ctrl;
+
+ ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+ ctrl &= ~(SDHCI_CTRL_4BITBUS | SDHCI_SIRF_8BITBUS);
+
+ /*
+ * CSR atlas7 and prima2 SD host version is not 3.0
+ * 8bit-width enable bit of CSR SD hosts is 3,
+ * while stardard hosts use bit 5
+ */
+ if (width == MMC_BUS_WIDTH_8)
+ ctrl |= SDHCI_SIRF_8BITBUS;
+ else if (width == MMC_BUS_WIDTH_4)
+ ctrl |= SDHCI_CTRL_4BITBUS;
+
+ sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+}
+
+static int sdhci_sirf_execute_tuning(struct sdhci_host *host, u32 opcode)
+{
+ int tuning_seq_cnt = 3;
+ u8 phase, tuned_phases[SIRF_TUNING_COUNT];
+ u8 tuned_phase_cnt = 0;
+ int rc = 0, longest_range = 0;
+ int start = -1, end = 0, tuning_value = -1, range = 0;
+ u16 clock_setting;
+ struct mmc_host *mmc = host->mmc;
+
+ clock_setting = sdhci_readw(host, SDHCI_CLK_DELAY_SETTING);
+ clock_setting &= ~0x3fff;
+
+retry:
+ phase = 0;
+ do {
+ sdhci_writel(host,
+ clock_setting | phase,
+ SDHCI_CLK_DELAY_SETTING);
+
+ if (!mmc_send_tuning(mmc)) {
+ /* Tuning is successful at this tuning point */
+ tuned_phases[tuned_phase_cnt++] = phase;
+ dev_dbg(mmc_dev(mmc), "%s: Found good phase = %d\n",
+ mmc_hostname(mmc), phase);
+ if (start == -1)
+ start = phase;
+ end = phase;
+ range++;
+ if (phase == (SIRF_TUNING_COUNT - 1)
+ && range > longest_range)
+ tuning_value = (start + end) / 2;
+ } else {
+ dev_dbg(mmc_dev(mmc), "%s: Found bad phase = %d\n",
+ mmc_hostname(mmc), phase);
+ if (range > longest_range) {
+ tuning_value = (start + end) / 2;
+ longest_range = range;
+ }
+ start = -1;
+ end = range = 0;
+ }
+ } while (++phase < ARRAY_SIZE(tuned_phases));
+
+ if (tuned_phase_cnt && tuning_value > 0) {
+ /*
+ * Finally set the selected phase in delay
+ * line hw block.
+ */
+ phase = tuning_value;
+ sdhci_writel(host,
+ clock_setting | phase,
+ SDHCI_CLK_DELAY_SETTING);
+
+ dev_dbg(mmc_dev(mmc), "%s: Setting the tuning phase to %d\n",
+ mmc_hostname(mmc), phase);
+ } else {
+ if (--tuning_seq_cnt)
+ goto retry;
+ /* Tuning failed */
+ dev_dbg(mmc_dev(mmc), "%s: No tuning point found\n",
+ mmc_hostname(mmc));
+ rc = -EIO;
+ }
+
+ return rc;
+}
+
+static struct sdhci_ops sdhci_sirf_ops = {
+ .platform_execute_tuning = sdhci_sirf_execute_tuning,
+ .set_clock = sdhci_set_clock,
+ .get_max_clock = sdhci_pltfm_clk_get_max_clock,
+ .set_bus_width = sdhci_sirf_set_bus_width,
+ .reset = sdhci_reset,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static struct sdhci_pltfm_data sdhci_sirf_pdata = {
+ .ops = &sdhci_sirf_ops,
+ .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
+ SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
+ SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+ SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
+ SDHCI_QUIRK_DELAY_AFTER_POWER,
+};
+
+static int sdhci_sirf_probe(struct platform_device *pdev)
+{
+ struct sdhci_host *host;
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_sirf_priv *priv;
+ struct clk *clk;
+ int gpio_cd;
+ int ret;
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "unable to get clock");
+ return PTR_ERR(clk);
+ }
+
+ if (pdev->dev.of_node)
+ gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
+ else
+ gpio_cd = -EINVAL;
+
+ host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv));
+ if (IS_ERR(host))
+ return PTR_ERR(host);
+
+ pltfm_host = sdhci_priv(host);
+ pltfm_host->clk = clk;
+ priv = sdhci_pltfm_priv(pltfm_host);
+ priv->gpio_cd = gpio_cd;
+
+ sdhci_get_of_property(pdev);
+
+ ret = clk_prepare_enable(pltfm_host->clk);
+ if (ret)
+ goto err_clk_prepare;
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_sdhci_add;
+
+ /*
+ * We must request the IRQ after sdhci_add_host(), as the tasklet only
+ * gets setup in sdhci_add_host() and we oops.
+ */
+ if (gpio_is_valid(priv->gpio_cd)) {
+ ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "card detect irq request failed: %d\n",
+ ret);
+ goto err_request_cd;
+ }
+ mmc_gpiod_request_cd_irq(host->mmc);
+ }
+
+ return 0;
+
+err_request_cd:
+ sdhci_remove_host(host, 0);
+err_sdhci_add:
+ clk_disable_unprepare(pltfm_host->clk);
+err_clk_prepare:
+ sdhci_pltfm_free(pdev);
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_sirf_suspend(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ int ret;
+
+ ret = sdhci_suspend_host(host);
+ if (ret)
+ return ret;
+
+ clk_disable(pltfm_host->clk);
+
+ return 0;
+}
+
+static int sdhci_sirf_resume(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ int ret;
+
+ ret = clk_enable(pltfm_host->clk);
+ if (ret) {
+ dev_dbg(dev, "Resume: Error enabling clock\n");
+ return ret;
+ }
+
+ return sdhci_resume_host(host);
+}
+
+static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume);
+#endif
+
+static const struct of_device_id sdhci_sirf_of_match[] = {
+ { .compatible = "sirf,prima2-sdhc" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match);
+
+static struct platform_driver sdhci_sirf_driver = {
+ .driver = {
+ .name = "sdhci-sirf",
+ .of_match_table = sdhci_sirf_of_match,
+#ifdef CONFIG_PM_SLEEP
+ .pm = &sdhci_sirf_pm_ops,
+#endif
+ },
+ .probe = sdhci_sirf_probe,
+ .remove = sdhci_pltfm_unregister,
+};
+
+module_platform_driver(sdhci_sirf_driver);
+
+MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco");
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff