/* * Copyright (C) 2010 Marvell International Ltd. * Zhangfei Gao <zhangfei.gao@marvell.com> * Kevin Wang <dwang4@marvell.com> * Mingwei Wang <mwwang@marvell.com> * Philip Rakity <prakity@marvell.com> * Mark Brown <markb@marvell.com> * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/err.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/gpio.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h> #include <linux/mmc/slot-gpio.h> #include <linux/platform_data/pxa_sdhci.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_gpio.h> #include <linux/pm.h> #include <linux/pm_runtime.h> #include <linux/mbus.h> #include "sdhci.h" #include "sdhci-pltfm.h" #define PXAV3_RPM_DELAY_MS 50 #define SD_CLOCK_BURST_SIZE_SETUP 0x10A #define SDCLK_SEL 0x100 #define SDCLK_DELAY_SHIFT 9 #define SDCLK_DELAY_MASK 0x1f #define SD_CFG_FIFO_PARAM 0x100 #define SDCFG_GEN_PAD_CLK_ON (1<<6) #define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF #define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24 #define SD_SPI_MODE 0x108 #define SD_CE_ATA_1 0x10C #define SD_CE_ATA_2 0x10E #define SDCE_MISC_INT (1<<2) #define SDCE_MISC_INT_EN (1<<1) struct sdhci_pxa { struct clk *clk_core; struct clk *clk_io; u8 power_mode; void __iomem *sdio3_conf_reg; }; /* * These registers are relative to the second register region, for the * MBus bridge. */ #define SDHCI_WINDOW_CTRL(i) (0x80 + ((i) << 3)) #define SDHCI_WINDOW_BASE(i) (0x84 + ((i) << 3)) #define SDHCI_MAX_WIN_NUM 8 /* * Fields below belong to SDIO3 Configuration Register (third register * region for the Armada 38x flavor) */ #define SDIO3_CONF_CLK_INV BIT(0) #define SDIO3_CONF_SD_FB_CLK BIT(2) static int mv_conf_mbus_windows(struct platform_device *pdev, const struct mbus_dram_target_info *dram) { int i; void __iomem *regs; struct resource *res; if (!dram) { dev_err(&pdev->dev, "no mbus dram info\n"); return -EINVAL; } res = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!res) { dev_err(&pdev->dev, "cannot get mbus registers\n"); return -EINVAL; } regs = ioremap(res->start, resource_size(res)); if (!regs) { dev_err(&pdev->dev, "cannot map mbus registers\n"); return -ENOMEM; } for (i = 0; i < SDHCI_MAX_WIN_NUM; i++) { writel(0, regs + SDHCI_WINDOW_CTRL(i)); writel(0, regs + SDHCI_WINDOW_BASE(i)); } for (i = 0; i < dram->num_cs; i++) { const struct mbus_dram_window *cs = dram->cs + i; /* Write size, attributes and target id to control register */ writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | (dram->mbus_dram_target_id << 4) | 1, regs + SDHCI_WINDOW_CTRL(i)); /* Write base address to base register */ writel(cs->base, regs + SDHCI_WINDOW_BASE(i)); } iounmap(regs); return 0; } static int armada_38x_quirks(struct platform_device *pdev, struct sdhci_host *host) { struct device_node *np = pdev->dev.of_node; struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host); struct resource *res; host->quirks &= ~SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN; host->quirks |= SDHCI_QUIRK_MISSING_CAPS; host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "conf-sdio3"); if (res) { pxa->sdio3_conf_reg = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(pxa->sdio3_conf_reg)) return PTR_ERR(pxa->sdio3_conf_reg); } else { /* * According to erratum 'FE-2946959' both SDR50 and DDR50 * modes require specific clock adjustments in SDIO3 * Configuration register, if the adjustment is not done, * remove them from the capabilities. */ host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50); dev_warn(&pdev->dev, "conf-sdio3 register not found: disabling SDR50 and DDR50 modes.\nConsider updating your dtb\n"); } /* * According to erratum 'ERR-7878951' Armada 38x SDHCI * controller has different capabilities than the ones shown * in its registers */ if (of_property_read_bool(np, "no-1-8-v")) { host->caps &= ~SDHCI_CAN_VDD_180; host->mmc->caps &= ~MMC_CAP_1_8V_DDR; } else { host->caps &= ~SDHCI_CAN_VDD_330; } host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_USE_SDR50_TUNING); return 0; } static void pxav3_reset(struct sdhci_host *host, u8 mask) { struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc)); struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; sdhci_reset(host, mask); if (mask == SDHCI_RESET_ALL) { /* * tune timing of read data/command when crc error happen * no performance impact */ if (pdata && 0 != pdata->clk_delay_cycles) { u16 tmp; tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK) << SDCLK_DELAY_SHIFT; tmp |= SDCLK_SEL; writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); } } } #define MAX_WAIT_COUNT 5 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host); u16 tmp; int count; if (pxa->power_mode == MMC_POWER_UP && power_mode == MMC_POWER_ON) { dev_dbg(mmc_dev(host->mmc), "%s: slot->power_mode = %d," "ios->power_mode = %d\n", __func__, pxa->power_mode, power_mode); /* set we want notice of when 74 clocks are sent */ tmp = readw(host->ioaddr + SD_CE_ATA_2); tmp |= SDCE_MISC_INT_EN; writew(tmp, host->ioaddr + SD_CE_ATA_2); /* start sending the 74 clocks */ tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM); tmp |= SDCFG_GEN_PAD_CLK_ON; writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM); /* slowest speed is about 100KHz or 10usec per clock */ udelay(740); count = 0; while (count++ < MAX_WAIT_COUNT) { if ((readw(host->ioaddr + SD_CE_ATA_2) & SDCE_MISC_INT) == 0) break; udelay(10); } if (count == MAX_WAIT_COUNT) dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n"); /* clear the interrupt bit if posted */ tmp = readw(host->ioaddr + SD_CE_ATA_2); tmp |= SDCE_MISC_INT; writew(tmp, host->ioaddr + SD_CE_ATA_2); } pxa->power_mode = power_mode; } static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host); u16 ctrl_2; /* * Set V18_EN -- UHS modes do not work without this. * does not change signaling voltage */ ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); /* Select Bus Speed Mode for host */ ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; switch (uhs) { case MMC_TIMING_UHS_SDR12: ctrl_2 |= SDHCI_CTRL_UHS_SDR12; break; case MMC_TIMING_UHS_SDR25: ctrl_2 |= SDHCI_CTRL_UHS_SDR25; break; case MMC_TIMING_UHS_SDR50: ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180; break; case MMC_TIMING_UHS_SDR104: ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180; break; case MMC_TIMING_MMC_DDR52: case MMC_TIMING_UHS_DDR50: ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180; break; } /* * Update SDIO3 Configuration register according to erratum * FE-2946959 */ if (pxa->sdio3_conf_reg) { u8 reg_val = readb(pxa->sdio3_conf_reg); if (uhs == MMC_TIMING_UHS_SDR50 || uhs == MMC_TIMING_UHS_DDR50) { reg_val &= ~SDIO3_CONF_CLK_INV; reg_val |= SDIO3_CONF_SD_FB_CLK; } else if (uhs == MMC_TIMING_MMC_HS) { reg_val &= ~SDIO3_CONF_CLK_INV; reg_val &= ~SDIO3_CONF_SD_FB_CLK; } else { reg_val |= SDIO3_CONF_CLK_INV; reg_val &= ~SDIO3_CONF_SD_FB_CLK; } writeb(reg_val, pxa->sdio3_conf_reg); } sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); dev_dbg(mmc_dev(host->mmc), "%s uhs = %d, ctrl_2 = %04X\n", __func__, uhs, ctrl_2); } static void pxav3_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd) { struct mmc_host *mmc = host->mmc; u8 pwr = host->pwr; sdhci_set_power_noreg(host, mode, vdd); if (host->pwr == pwr) return; if (host->pwr == 0) vdd = 0; if (!IS_ERR(mmc->supply.vmmc)) { spin_unlock_irq(&host->lock); mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); spin_lock_irq(&host->lock); } } static const struct sdhci_ops pxav3_sdhci_ops = { .set_clock = sdhci_set_clock, .set_power = pxav3_set_power, .platform_send_init_74_clocks = pxav3_gen_init_74_clocks, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .set_bus_width = sdhci_set_bus_width, .reset = pxav3_reset, .set_uhs_signaling = pxav3_set_uhs_signaling, }; static struct sdhci_pltfm_data sdhci_pxav3_pdata = { .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | SDHCI_QUIRK_32BIT_ADMA_SIZE | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .ops = &pxav3_sdhci_ops, }; #ifdef CONFIG_OF static const struct of_device_id sdhci_pxav3_of_match[] = { { .compatible = "mrvl,pxav3-mmc", }, { .compatible = "marvell,armada-380-sdhci", }, {}, }; MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match); static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) { struct sdhci_pxa_platdata *pdata; struct device_node *np = dev->of_node; u32 clk_delay_cycles; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return NULL; if (!of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles)) pdata->clk_delay_cycles = clk_delay_cycles; return pdata; } #else static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) { return NULL; } #endif static int sdhci_pxav3_probe(struct platform_device *pdev) { struct sdhci_pltfm_host *pltfm_host; struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; struct device *dev = &pdev->dev; struct device_node *np = pdev->dev.of_node; struct sdhci_host *host = NULL; struct sdhci_pxa *pxa = NULL; const struct of_device_id *match; int ret; host = sdhci_pltfm_init(pdev, &sdhci_pxav3_pdata, sizeof(*pxa)); if (IS_ERR(host)) return PTR_ERR(host); pltfm_host = sdhci_priv(host); pxa = sdhci_pltfm_priv(pltfm_host); pxa->clk_io = devm_clk_get(dev, "io"); if (IS_ERR(pxa->clk_io)) pxa->clk_io = devm_clk_get(dev, NULL); if (IS_ERR(pxa->clk_io)) { dev_err(dev, "failed to get io clock\n"); ret = PTR_ERR(pxa->clk_io); goto err_clk_get; } pltfm_host->clk = pxa->clk_io; clk_prepare_enable(pxa->clk_io); pxa->clk_core = devm_clk_get(dev, "core"); if (!IS_ERR(pxa->clk_core)) clk_prepare_enable(pxa->clk_core); /* enable 1/8V DDR capable */ host->mmc->caps |= MMC_CAP_1_8V_DDR; if (of_device_is_compatible(np, "marvell,armada-380-sdhci")) { ret = armada_38x_quirks(pdev, host); if (ret < 0) goto err_mbus_win; ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info()); if (ret < 0) goto err_mbus_win; } match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev); if (match) { ret = mmc_of_parse(host->mmc); if (ret) goto err_of_parse; sdhci_get_of_property(pdev); pdata = pxav3_get_mmc_pdata(dev); pdev->dev.platform_data = pdata; } else if (pdata) { /* on-chip device */ if (pdata->flags & PXA_FLAG_CARD_PERMANENT) host->mmc->caps |= MMC_CAP_NONREMOVABLE; /* If slot design supports 8 bit data, indicate this to MMC. */ if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) host->mmc->caps |= MMC_CAP_8_BIT_DATA; if (pdata->quirks) host->quirks |= pdata->quirks; if (pdata->quirks2) host->quirks2 |= pdata->quirks2; if (pdata->host_caps) host->mmc->caps |= pdata->host_caps; if (pdata->host_caps2) host->mmc->caps2 |= pdata->host_caps2; if (pdata->pm_caps) host->mmc->pm_caps |= pdata->pm_caps; if (gpio_is_valid(pdata->ext_cd_gpio)) { ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio, 0); if (ret) { dev_err(mmc_dev(host->mmc), "failed to allocate card detect gpio\n"); goto err_cd_req; } } } pm_runtime_get_noresume(&pdev->dev); pm_runtime_set_active(&pdev->dev); pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS); pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_enable(&pdev->dev); pm_suspend_ignore_children(&pdev->dev, 1); ret = sdhci_add_host(host); if (ret) { dev_err(&pdev->dev, "failed to add host\n"); goto err_add_host; } if (host->mmc->pm_caps & MMC_PM_WAKE_SDIO_IRQ) device_init_wakeup(&pdev->dev, 1); pm_runtime_put_autosuspend(&pdev->dev); return 0; err_add_host: pm_runtime_disable(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); err_of_parse: err_cd_req: err_mbus_win: clk_disable_unprepare(pxa->clk_io); clk_disable_unprepare(pxa->clk_core); err_clk_get: sdhci_pltfm_free(pdev); return ret; } static int sdhci_pxav3_remove(struct platform_device *pdev) { struct sdhci_host *host = platform_get_drvdata(pdev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host); pm_runtime_get_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); sdhci_remove_host(host, 1); clk_disable_unprepare(pxa->clk_io); clk_disable_unprepare(pxa->clk_core); sdhci_pltfm_free(pdev); return 0; } #ifdef CONFIG_PM_SLEEP static int sdhci_pxav3_suspend(struct device *dev) { int ret; struct sdhci_host *host = dev_get_drvdata(dev); pm_runtime_get_sync(dev); if (host->tuning_mode != SDHCI_TUNING_MODE_3) mmc_retune_needed(host->mmc); ret = sdhci_suspend_host(host); pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); return ret; } static int sdhci_pxav3_resume(struct device *dev) { int ret; struct sdhci_host *host = dev_get_drvdata(dev); pm_runtime_get_sync(dev); ret = sdhci_resume_host(host); pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); return ret; } #endif #ifdef CONFIG_PM static int sdhci_pxav3_runtime_suspend(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host); int ret; ret = sdhci_runtime_suspend_host(host); if (ret) return ret; if (host->tuning_mode != SDHCI_TUNING_MODE_3) mmc_retune_needed(host->mmc); clk_disable_unprepare(pxa->clk_io); if (!IS_ERR(pxa->clk_core)) clk_disable_unprepare(pxa->clk_core); return 0; } static int sdhci_pxav3_runtime_resume(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host); clk_prepare_enable(pxa->clk_io); if (!IS_ERR(pxa->clk_core)) clk_prepare_enable(pxa->clk_core); return sdhci_runtime_resume_host(host); } #endif static const struct dev_pm_ops sdhci_pxav3_pmops = { SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume) SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend, sdhci_pxav3_runtime_resume, NULL) }; static struct platform_driver sdhci_pxav3_driver = { .driver = { .name = "sdhci-pxav3", .of_match_table = of_match_ptr(sdhci_pxav3_of_match), .pm = &sdhci_pxav3_pmops, }, .probe = sdhci_pxav3_probe, .remove = sdhci_pxav3_remove, }; module_platform_driver(sdhci_pxav3_driver); MODULE_DESCRIPTION("SDHCI driver for pxav3"); MODULE_AUTHOR("Marvell International Ltd."); MODULE_LICENSE("GPL v2");