diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-dove.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-dove.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-dove.c b/drivers/mmc/host/sdhci-dove.c new file mode 100644 index 00000000000..e6278ec007d --- /dev/null +++ b/drivers/mmc/host/sdhci-dove.c @@ -0,0 +1,162 @@ +/* + * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC + * + * Author: Saeed Bishara <saeed@marvell.com> + * Mike Rapoport <mike@compulab.co.il> + * Based on sdhci-cns3xxx.c + * + * 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. + */ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/mmc/host.h> +#include <linux/module.h> +#include <linux/of.h> + +#include "sdhci-pltfm.h" + +struct sdhci_dove_priv { + struct clk *clk; +}; + +static u16 sdhci_dove_readw(struct sdhci_host *host, int reg) +{ + u16 ret; + + switch (reg) { + case SDHCI_HOST_VERSION: + case SDHCI_SLOT_INT_STATUS: + /* those registers don't exist */ + return 0; + default: + ret = readw(host->ioaddr + reg); + } + return ret; +} + +static u32 sdhci_dove_readl(struct sdhci_host *host, int reg) +{ + u32 ret; + + ret = readl(host->ioaddr + reg); + + switch (reg) { + case SDHCI_CAPABILITIES: + /* Mask the support for 3.0V */ + ret &= ~SDHCI_CAN_VDD_300; + break; + } + return ret; +} + +static const struct sdhci_ops sdhci_dove_ops = { + .read_w = sdhci_dove_readw, + .read_l = sdhci_dove_readl, + .set_clock = sdhci_set_clock, + .set_bus_width = sdhci_set_bus_width, + .reset = sdhci_reset, + .set_uhs_signaling = sdhci_set_uhs_signaling, +}; + +static const struct sdhci_pltfm_data sdhci_dove_pdata = { + .ops = &sdhci_dove_ops, + .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER | + SDHCI_QUIRK_NO_BUSY_IRQ | + SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | + SDHCI_QUIRK_FORCE_DMA | + SDHCI_QUIRK_NO_HISPD_BIT, +}; + +static int sdhci_dove_probe(struct platform_device *pdev) +{ + struct sdhci_host *host; + struct sdhci_pltfm_host *pltfm_host; + struct sdhci_dove_priv *priv; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv), + GFP_KERNEL); + if (!priv) { + dev_err(&pdev->dev, "unable to allocate private data"); + return -ENOMEM; + } + + priv->clk = devm_clk_get(&pdev->dev, NULL); + + host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0); + if (IS_ERR(host)) + return PTR_ERR(host); + + pltfm_host = sdhci_priv(host); + pltfm_host->priv = priv; + + if (!IS_ERR(priv->clk)) + clk_prepare_enable(priv->clk); + + ret = mmc_of_parse(host->mmc); + if (ret) + goto err_sdhci_add; + + ret = sdhci_add_host(host); + if (ret) + goto err_sdhci_add; + + return 0; + +err_sdhci_add: + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); + sdhci_pltfm_free(pdev); + return ret; +} + +static int sdhci_dove_remove(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_dove_priv *priv = pltfm_host->priv; + + sdhci_pltfm_unregister(pdev); + + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); + + return 0; +} + +static const struct of_device_id sdhci_dove_of_match_table[] = { + { .compatible = "marvell,dove-sdhci", }, + {} +}; +MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table); + +static struct platform_driver sdhci_dove_driver = { + .driver = { + .name = "sdhci-dove", + .owner = THIS_MODULE, + .pm = SDHCI_PLTFM_PMOPS, + .of_match_table = sdhci_dove_of_match_table, + }, + .probe = sdhci_dove_probe, + .remove = sdhci_dove_remove, +}; + +module_platform_driver(sdhci_dove_driver); + +MODULE_DESCRIPTION("SDHCI driver for Dove"); +MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, " + "Mike Rapoport <mike@compulab.co.il>"); +MODULE_LICENSE("GPL v2"); |