| /* |
| * sdhci-pltfm.c Support for SDHCI platform devices |
| * Copyright (c) 2009 Intel Corporation |
| * |
| * Copyright (c) 2007 Freescale Semiconductor, Inc. |
| * Copyright (c) 2009 MontaVista Software, Inc. |
| * |
| * Authors: Xiaobo Xie <X.Xie@freescale.com> |
| * Anton Vorontsov <avorontsov@ru.mvista.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| /* Supports: |
| * SDHCI platform devices |
| * |
| * Inspired by sdhci-pci.c, by Pierre Ossman |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/of.h> |
| #ifdef CONFIG_PPC |
| #include <asm/machdep.h> |
| #endif |
| #include "sdhci.h" |
| #include "sdhci-pltfm.h" |
| |
| static struct sdhci_ops sdhci_pltfm_ops = { |
| }; |
| |
| #ifdef CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER |
| /* |
| * These accessors are designed for big endian hosts doing I/O to |
| * little endian controllers incorporating a 32-bit hardware byte swapper. |
| */ |
| u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg) |
| { |
| return in_be32(host->ioaddr + reg); |
| } |
| |
| u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg) |
| { |
| return in_be16(host->ioaddr + (reg ^ 0x2)); |
| } |
| |
| u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg) |
| { |
| return in_8(host->ioaddr + (reg ^ 0x3)); |
| } |
| |
| void sdhci_be32bs_writel(struct sdhci_host *host, u32 val, int reg) |
| { |
| out_be32(host->ioaddr + reg, val); |
| } |
| |
| void sdhci_be32bs_writew(struct sdhci_host *host, u16 val, int reg) |
| { |
| struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| int base = reg & ~0x3; |
| int shift = (reg & 0x2) * 8; |
| |
| switch (reg) { |
| case SDHCI_TRANSFER_MODE: |
| /* |
| * Postpone this write, we must do it together with a |
| * command write that is down below. |
| */ |
| pltfm_host->xfer_mode_shadow = val; |
| return; |
| case SDHCI_COMMAND: |
| sdhci_be32bs_writel(host, |
| val << 16 | pltfm_host->xfer_mode_shadow, |
| SDHCI_TRANSFER_MODE); |
| return; |
| } |
| clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift); |
| } |
| |
| void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg) |
| { |
| int base = reg & ~0x3; |
| int shift = (reg & 0x3) * 8; |
| |
| clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift); |
| } |
| #endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */ |
| |
| #ifdef CONFIG_OF |
| static bool sdhci_of_wp_inverted(struct device_node *np) |
| { |
| if (of_get_property(np, "sdhci,wp-inverted", NULL)) |
| return true; |
| |
| /* Old device trees don't have the wp-inverted property. */ |
| #ifdef CONFIG_PPC |
| return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); |
| #else |
| return false; |
| #endif /* CONFIG_PPC */ |
| } |
| |
| void sdhci_get_of_property(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct sdhci_host *host = platform_get_drvdata(pdev); |
| struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| const __be32 *clk; |
| int size; |
| |
| if (of_device_is_available(np)) { |
| if (of_get_property(np, "sdhci,auto-cmd12", NULL)) |
| host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; |
| |
| if (of_get_property(np, "sdhci,1-bit-only", NULL)) |
| host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; |
| |
| if (sdhci_of_wp_inverted(np)) |
| host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; |
| |
| clk = of_get_property(np, "clock-frequency", &size); |
| if (clk && size == sizeof(*clk) && *clk) |
| pltfm_host->clock = be32_to_cpup(clk); |
| } |
| } |
| #else |
| void sdhci_get_of_property(struct platform_device *pdev) {} |
| #endif /* CONFIG_OF */ |
| |
| struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, |
| struct sdhci_pltfm_data *pdata) |
| { |
| struct sdhci_host *host; |
| struct sdhci_pltfm_host *pltfm_host; |
| struct resource *iomem; |
| int ret; |
| |
| iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!iomem) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| if (resource_size(iomem) < 0x100) |
| dev_err(&pdev->dev, "Invalid iomem size!\n"); |
| |
| /* Some PCI-based MFD need the parent here */ |
| if (pdev->dev.parent != &platform_bus) |
| host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); |
| else |
| host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); |
| |
| if (IS_ERR(host)) { |
| ret = PTR_ERR(host); |
| goto err; |
| } |
| |
| pltfm_host = sdhci_priv(host); |
| |
| host->hw_name = dev_name(&pdev->dev); |
| if (pdata && pdata->ops) |
| host->ops = pdata->ops; |
| else |
| host->ops = &sdhci_pltfm_ops; |
| if (pdata) |
| host->quirks = pdata->quirks; |
| host->irq = platform_get_irq(pdev, 0); |
| |
| if (!request_mem_region(iomem->start, resource_size(iomem), |
| mmc_hostname(host->mmc))) { |
| dev_err(&pdev->dev, "cannot request region\n"); |
| ret = -EBUSY; |
| goto err_request; |
| } |
| |
| host->ioaddr = ioremap(iomem->start, resource_size(iomem)); |
| if (!host->ioaddr) { |
| dev_err(&pdev->dev, "failed to remap registers\n"); |
| ret = -ENOMEM; |
| goto err_remap; |
| } |
| |
| platform_set_drvdata(pdev, host); |
| |
| return host; |
| |
| err_remap: |
| release_mem_region(iomem->start, resource_size(iomem)); |
| err_request: |
| sdhci_free_host(host); |
| err: |
| dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); |
| return ERR_PTR(ret); |
| } |
| |
| void sdhci_pltfm_free(struct platform_device *pdev) |
| { |
| struct sdhci_host *host = platform_get_drvdata(pdev); |
| struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| |
| iounmap(host->ioaddr); |
| release_mem_region(iomem->start, resource_size(iomem)); |
| sdhci_free_host(host); |
| platform_set_drvdata(pdev, NULL); |
| } |
| |
| int sdhci_pltfm_register(struct platform_device *pdev, |
| struct sdhci_pltfm_data *pdata) |
| { |
| struct sdhci_host *host; |
| int ret = 0; |
| |
| host = sdhci_pltfm_init(pdev, pdata); |
| if (IS_ERR(host)) |
| return PTR_ERR(host); |
| |
| sdhci_get_of_property(pdev); |
| |
| ret = sdhci_add_host(host); |
| if (ret) |
| sdhci_pltfm_free(pdev); |
| |
| return ret; |
| } |
| |
| int sdhci_pltfm_unregister(struct platform_device *pdev) |
| { |
| struct sdhci_host *host = platform_get_drvdata(pdev); |
| int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); |
| |
| sdhci_remove_host(host, dead); |
| sdhci_pltfm_free(pdev); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state) |
| { |
| struct sdhci_host *host = platform_get_drvdata(dev); |
| |
| return sdhci_suspend_host(host, state); |
| } |
| |
| int sdhci_pltfm_resume(struct platform_device *dev) |
| { |
| struct sdhci_host *host = platform_get_drvdata(dev); |
| |
| return sdhci_resume_host(host); |
| } |
| #endif /* CONFIG_PM */ |