On Wed, Sep 28, 2011 at 4:02 PM, Shashidhar Hiremath
<shashidh...@vayavyalabs.com> wrote:
>
> Signed-off-by: Shashidhar Hiremath <shashidh...@vayavyalabs.com>
> ---
> drivers/mmc/host/Kconfig | 11 ++++
> drivers/mmc/host/dw_mmc.c | 126
> ++++++++++++++++++++++++++++++++++++++++++++
> drivers/mmc/host/dw_mmc.h | 12 ++++
> include/linux/mmc/dw_mmc.h | 4 ++
> 4 files changed, 153 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 8c87096..84d8908 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -526,6 +526,17 @@ config MMC_DW
> block, this provides host support for SD and MMC interfaces, in both
> PIO and external DMA modes.
>
> +config MMC_DW_PCI
> + bool "MMC_DW Support On PCI bus"
> + depends on MMC_DW && PCI
> + help
> + This selects the PCI for the Synopsys Designware Mobile Storage IP.
> +
> + If you have a controller with this interface, say Y or M here.
> +
> + If unsure, say N.
> +
> +
> config MMC_DW_IDMAC
> bool "Internal DMAC interface"
> depends on MMC_DW
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index ff0f714..74f28a5 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -21,7 +21,11 @@
> #include <linux/interrupt.h>
> #include <linux/ioport.h>
> #include <linux/module.h>
> +#ifdef CONFIG_MMC_DW_PCI
> +#include <linux/pci.h>
> +#else
> #include <linux/platform_device.h>
> +#endif
This doesn't need an #ifdef.
> #include <linux/scatterlist.h>
> #include <linux/seq_file.h>
> #include <linux/slab.h>
> @@ -101,6 +105,18 @@ struct dw_mci_slot {
> int last_detect_state;
> };
>
> +#ifdef CONFIG_MMC_DW_PCI
> +static struct pci_device_id dw_mci_id = { PCI_DEVICE(DEVICE_ID, VENDOR_ID)
> };
> +
> +struct dw_mci_board pci_board_data = {
> + .num_slots = 1,
> + .caps = DW_MCI_CAPABILITIES,
> + .bus_hz = 33 * 1000 * 1000,
Is this value correct? The bus this refers to is the SD bus, so 33MHz
is not fast.
> + .detect_delay_ms = 200,
> + .fifo_depth = 32,
> +};
> +#endif
> +
> static struct workqueue_struct *dw_mci_card_workqueue;
>
> #if defined(CONFIG_DEBUG_FS)
> @@ -682,6 +698,9 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct
> mmc_ios *ios)
> {
> struct dw_mci_slot *slot = mmc_priv(mmc);
> u32 regs;
> +#ifdef CONFIG_MMC_DW_PCI
> + u32 card_detect;
> +#endif
>
> /* set default 1 bit mode */
> slot->ctype = SDMMC_CTYPE_1BIT;
> @@ -716,7 +735,15 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct
> mmc_ios *ios)
> switch (ios->power_mode) {
> case MMC_POWER_UP:
> set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
> +#ifdef CONFIG_MMC_DW_PCI
> + /* Enable Power to the card that has been detected */
> + card_detect = mci_readl(slot->host, CDETECT);
> + mci_writel(slot->host, PWREN, ((~card_detect) & 0x1));
> + break;
> + case MMC_POWER_OFF:
> + mci_writel(slot->host, PWREN, 0);
> break;
> +#endif
It may be safe to not #ifdef this, all the hardware I have uses an
external regulator so the PWREN bits do nothing. I could imagine
hardware that was non-PCI that could use PWREN however.
> default:
> break;
> }
> @@ -1775,7 +1802,12 @@ static bool mci_wait_reset(struct device *dev, struct
> dw_mci *host)
> return false;
> }
>
> +#ifdef CONFIG_MMC_DW_PCI
> +static int __devinit dw_mci_probe(struct pci_dev *pdev,
> + const struct pci_device_id *entries)
> +#else
> static int dw_mci_probe(struct platform_device *pdev)
> +#endif
Possibly it would be better to split this into three functions:
dw_mci_pci_probe
dw_mci_platform_probe
dw_mci_probe
And then the pci/platform probe functions can call the generic probe
function to do the common parts of the setup.
> +#ifdef CONFIG_MMC_DW_PCI
> +static void __devexit dw_mci_remove(struct pci_dev *pdev)
> +#else
> static int __exit dw_mci_remove(struct platform_device *pdev)
> +#endif
Again this should probably be split into separate functions to reduce
the number of #ifdefs.
> {
> +
> +#ifdef CONFIG_MMC_DW_PCI
> + struct dw_mci *host = pci_get_drvdata(pdev);
> +#else
> struct dw_mci *host = platform_get_drvdata(pdev);
> +#endif
> int i;
>
> mci_writel(host, RINTSTS, 0xFFFFFFFF);
> mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
>
> +#ifdef CONFIG_MMC_DW_PCI
> + pci_set_drvdata(pdev, NULL);
> +#else
> platform_set_drvdata(pdev, NULL);
> +#endif
>
> for (i = 0; i < host->num_slots; i++) {
> dev_dbg(&pdev->dev, "remove slot %d\n", i);
> @@ -1992,7 +2074,11 @@ static int __exit dw_mci_remove(struct platform_device
> *pdev)
> mci_writel(host, CLKENA, 0);
> mci_writel(host, CLKSRC, 0);
>
> +#ifdef CONFIG_MMC_DW_PCI
> + free_irq(pdev->irq, host);
> +#else
> free_irq(platform_get_irq(pdev, 0), host);
> +#endif
> destroy_workqueue(dw_mci_card_workqueue);
> dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
>
> @@ -2006,18 +2092,31 @@ static int __exit dw_mci_remove(struct
> platform_device *pdev)
>
> iounmap(host->regs);
>
> +#ifdef CONFIG_MMC_DW_PCI
> + pci_release_regions(pdev);
> +#endif
> kfree(host);
> +#ifndef CONFIG_MMC_DW_PCI
> return 0;
> +#endif
> }
>
> #ifdef CONFIG_PM
> /*
> * TODO: we should probably disable the clock to the card in the suspend path.
> */
> +#ifdef CONFIG_MMC_DW_PCI
> +static int dw_mci_suspend(struct pci_dev *pdev, pm_message_t mesg)
> +#else
> static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
> +#endif
> {
> int i, ret;
> +#ifdef CONFIG_MMC_DW_PCI
> + struct dw_mci *host = pci_get_drvdata(pdev);
> +#else
> struct dw_mci *host = platform_get_drvdata(pdev);
> +#endif
>
> for (i = 0; i < host->num_slots; i++) {
> struct dw_mci_slot *slot = host->slot[i];
> @@ -2040,10 +2139,18 @@ static int dw_mci_suspend(struct platform_device
> *pdev, pm_message_t mesg)
> return 0;
> }
>
> +#ifdef CONFIG_MMC_DW_PCI
> +static int dw_mci_resume(struct pci_dev *pdev)
> +#else
> static int dw_mci_resume(struct platform_device *pdev)
> +#endif
> {
> int i, ret;
> +#ifdef CONFIG_MMC_DW_PCI
> + struct dw_mci *host = pci_get_drvdata(pdev);
> +#else
> struct dw_mci *host = platform_get_drvdata(pdev);
> +#endif
Even though these functions are quite simple it would be better to code them as
dw_mci_platform_resume(struct platform_device *pdev)
calling dw_mci_resume(struct dw_mci *host)
dw_mci_pci_resume(struct pci_dev *pdev)
calling dw_mci_resume(struct dw_mci *host)
To reduce the #ifdef overhead.
>
> if (host->vmmc)
> regulator_enable(host->vmmc);
> @@ -2081,6 +2188,16 @@ static int dw_mci_resume(struct platform_device *pdev)
> #define dw_mci_resume NULL
> #endif /* CONFIG_PM */
>
> +#ifdef CONFIG_MMC_DW_PCI
> +static struct pci_driver dw_mci_driver = {
> + .name = "dw_mmc",
> + .id_table = &dw_mci_id,
> + .probe = dw_mci_probe,
> + .remove = dw_mci_remove,
> + .suspend = dw_mci_suspend,
> + .resume = dw_mci_resume,
> +};
> +#else
> static struct platform_driver dw_mci_driver = {
> .remove = __exit_p(dw_mci_remove),
> .suspend = dw_mci_suspend,
> @@ -2089,15 +2206,24 @@ static struct platform_driver dw_mci_driver = {
> .name = "dw_mmc",
> },
> };
> +#endif
>
> static int __init dw_mci_init(void)
> {
> +#ifdef CONFIG_MMC_DW_PCI
> + return pci_register_driver(&dw_mci_driver);
> +#else
> return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
> +#endif
> }
>
> static void __exit dw_mci_exit(void)
> {
> +#ifdef CONFIG_MMC_DW_PCI
> + pci_unregister_driver(&dw_mci_driver);
> +#else
> platform_driver_unregister(&dw_mci_driver);
> +#endif
> }
>
> module_init(dw_mci_init);
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index 027d377..3b1e459 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -164,4 +164,16 @@
> (*(volatile u64 __force *)((dev)->regs + SDMMC_##reg) = (value))
> #endif
>
> +/* PCI Specific macros */
> +#ifdef CONFIG_MMC_DW_PCI
> +#define PCI_BAR_NO 2
> +#define COMPLETE_BAR 0
> +/* Dummy Device Id and Vendor Id */
> +#define VENDOR_ID 0x700
> +#define DEVICE_ID 0x1107
> +/* Defining the Capabilities */
> +#define DW_MCI_CAPABILITIES (MMC_CAP_4_BIT_DATA | MMC_CAP_MMC_HIGHSPEED |\
> + MMC_CAP_SD_HIGHSPEED | MMC_CAP_8_BIT_DATA |
> MMC_CAP_SDIO_IRQ)
> +#endif
> +
Are these all necessary?
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