forked from Minki/linux
260b316436
The dw_mmc driver stores the physical address of the MMIO registers
in a pointer, which requires the use of type casts, and is actually
broken if anyone ever has this device on a 32-bit SoC in registers
above 4GB. Gcc warns about this possibility when the driver is built
with ARM LPAE enabled:
mmc/host/dw_mmc.c: In function 'dw_mci_edmac_start_dma':
mmc/host/dw_mmc.c:702:17: warning: cast from pointer to integer of different size
cfg.dst_addr = (dma_addr_t)(host->phy_regs + fifo_offset);
^
mmc/host/dw_mmc-pltfm.c: In function 'dw_mci_pltfm_register':
mmc/host/dw_mmc-pltfm.c:63:19: warning: cast to pointer from integer of different size
host->phy_regs = (void *)(regs->start);
This changes the code to use resource_size_t, which gets rid of the
warning, the bug and the useless casts.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*
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* Synopsys DesignWare Multimedia Card Interface driver
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*
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* Copyright (C) 2009 NXP Semiconductors
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* Copyright (C) 2009, 2010 Imagination Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/dw_mmc.h>
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#include <linux/of.h>
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#include <linux/clk.h>
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#include "dw_mmc.h"
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#include "dw_mmc-pltfm.h"
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static void dw_mci_pltfm_prepare_command(struct dw_mci *host, u32 *cmdr)
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{
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*cmdr |= SDMMC_CMD_USE_HOLD_REG;
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}
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static const struct dw_mci_drv_data socfpga_drv_data = {
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.prepare_command = dw_mci_pltfm_prepare_command,
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};
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static const struct dw_mci_drv_data pistachio_drv_data = {
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.prepare_command = dw_mci_pltfm_prepare_command,
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};
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int dw_mci_pltfm_register(struct platform_device *pdev,
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const struct dw_mci_drv_data *drv_data)
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{
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struct dw_mci *host;
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struct resource *regs;
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host = devm_kzalloc(&pdev->dev, sizeof(struct dw_mci), GFP_KERNEL);
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if (!host)
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return -ENOMEM;
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host->irq = platform_get_irq(pdev, 0);
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if (host->irq < 0)
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return host->irq;
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host->drv_data = drv_data;
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host->dev = &pdev->dev;
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host->irq_flags = 0;
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host->pdata = pdev->dev.platform_data;
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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/* Get registers' physical base address */
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host->phy_regs = regs->start;
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host->regs = devm_ioremap_resource(&pdev->dev, regs);
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if (IS_ERR(host->regs))
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return PTR_ERR(host->regs);
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platform_set_drvdata(pdev, host);
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return dw_mci_probe(host);
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}
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EXPORT_SYMBOL_GPL(dw_mci_pltfm_register);
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#ifdef CONFIG_PM_SLEEP
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/*
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* TODO: we should probably disable the clock to the card in the suspend path.
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*/
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static int dw_mci_pltfm_suspend(struct device *dev)
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{
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struct dw_mci *host = dev_get_drvdata(dev);
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return dw_mci_suspend(host);
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}
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static int dw_mci_pltfm_resume(struct device *dev)
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{
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struct dw_mci *host = dev_get_drvdata(dev);
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return dw_mci_resume(host);
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}
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#endif /* CONFIG_PM_SLEEP */
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SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume);
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EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
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static const struct of_device_id dw_mci_pltfm_match[] = {
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{ .compatible = "snps,dw-mshc", },
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{ .compatible = "altr,socfpga-dw-mshc",
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.data = &socfpga_drv_data },
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{ .compatible = "img,pistachio-dw-mshc",
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.data = &pistachio_drv_data },
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{},
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};
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MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
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static int dw_mci_pltfm_probe(struct platform_device *pdev)
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{
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const struct dw_mci_drv_data *drv_data = NULL;
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const struct of_device_id *match;
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if (pdev->dev.of_node) {
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match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
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drv_data = match->data;
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}
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return dw_mci_pltfm_register(pdev, drv_data);
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}
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int dw_mci_pltfm_remove(struct platform_device *pdev)
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{
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struct dw_mci *host = platform_get_drvdata(pdev);
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dw_mci_remove(host);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove);
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static struct platform_driver dw_mci_pltfm_driver = {
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.probe = dw_mci_pltfm_probe,
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.remove = dw_mci_pltfm_remove,
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.driver = {
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.name = "dw_mmc",
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.of_match_table = dw_mci_pltfm_match,
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.pm = &dw_mci_pltfm_pmops,
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},
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};
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module_platform_driver(dw_mci_pltfm_driver);
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MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
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MODULE_AUTHOR("NXP Semiconductor VietNam");
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MODULE_AUTHOR("Imagination Technologies Ltd");
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MODULE_LICENSE("GPL v2");
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