diff options
Diffstat (limited to 'drivers/mfd/tc6387xb.c')
| -rw-r--r-- | drivers/mfd/tc6387xb.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/drivers/mfd/tc6387xb.c b/drivers/mfd/tc6387xb.c new file mode 100644 index 000000000..e846e4d26 --- /dev/null +++ b/drivers/mfd/tc6387xb.c @@ -0,0 +1,233 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Toshiba TC6387XB support + * Copyright (c) 2005 Ian Molton + * + * This file contains TC6387XB base support. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/mfd/core.h> +#include <linux/mfd/tmio.h> +#include <linux/mfd/tc6387xb.h> +#include <linux/slab.h> + +enum { + TC6387XB_CELL_MMC, +}; + +struct tc6387xb { + void __iomem *scr; + struct clk *clk32k; + struct resource rscr; +}; + +static const struct resource tc6387xb_mmc_resources[] = { + { + .start = 0x800, + .end = 0x9ff, + .flags = IORESOURCE_MEM, + }, + { + .start = 0, + .end = 0, + .flags = IORESOURCE_IRQ, + }, +}; + +/*--------------------------------------------------------------------------*/ + +#ifdef CONFIG_PM +static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state) +{ + struct tc6387xb *tc6387xb = platform_get_drvdata(dev); + struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev); + + if (pdata && pdata->suspend) + pdata->suspend(dev); + clk_disable_unprepare(tc6387xb->clk32k); + + return 0; +} + +static int tc6387xb_resume(struct platform_device *dev) +{ + struct tc6387xb *tc6387xb = platform_get_drvdata(dev); + struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev); + + clk_prepare_enable(tc6387xb->clk32k); + if (pdata && pdata->resume) + pdata->resume(dev); + + tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0, + tc6387xb_mmc_resources[0].start & 0xfffe); + + return 0; +} +#else +#define tc6387xb_suspend NULL +#define tc6387xb_resume NULL +#endif + +/*--------------------------------------------------------------------------*/ + +static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state) +{ + struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); + + tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state); +} + +static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state) +{ + struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); + + tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state); +} + + +static int tc6387xb_mmc_enable(struct platform_device *mmc) +{ + struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); + + clk_prepare_enable(tc6387xb->clk32k); + + tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0, + tc6387xb_mmc_resources[0].start & 0xfffe); + + return 0; +} + +static int tc6387xb_mmc_disable(struct platform_device *mmc) +{ + struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent); + + clk_disable_unprepare(tc6387xb->clk32k); + + return 0; +} + +static struct tmio_mmc_data tc6387xb_mmc_data = { + .hclk = 24000000, + .set_pwr = tc6387xb_mmc_pwr, + .set_clk_div = tc6387xb_mmc_clk_div, +}; + +/*--------------------------------------------------------------------------*/ + +static const struct mfd_cell tc6387xb_cells[] = { + [TC6387XB_CELL_MMC] = { + .name = "tmio-mmc", + .enable = tc6387xb_mmc_enable, + .disable = tc6387xb_mmc_disable, + .platform_data = &tc6387xb_mmc_data, + .pdata_size = sizeof(tc6387xb_mmc_data), + .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources), + .resources = tc6387xb_mmc_resources, + }, +}; + +static int tc6387xb_probe(struct platform_device *dev) +{ + struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev); + struct resource *iomem, *rscr; + struct clk *clk32k; + struct tc6387xb *tc6387xb; + int irq, ret; + + iomem = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!iomem) + return -EINVAL; + + tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL); + if (!tc6387xb) + return -ENOMEM; + + ret = platform_get_irq(dev, 0); + if (ret >= 0) + irq = ret; + else + goto err_no_irq; + + clk32k = clk_get(&dev->dev, "CLK_CK32K"); + if (IS_ERR(clk32k)) { + ret = PTR_ERR(clk32k); + goto err_no_clk; + } + + rscr = &tc6387xb->rscr; + rscr->name = "tc6387xb-core"; + rscr->start = iomem->start; + rscr->end = iomem->start + 0xff; + rscr->flags = IORESOURCE_MEM; + + ret = request_resource(iomem, rscr); + if (ret) + goto err_resource; + + tc6387xb->scr = ioremap(rscr->start, resource_size(rscr)); + if (!tc6387xb->scr) { + ret = -ENOMEM; + goto err_ioremap; + } + + tc6387xb->clk32k = clk32k; + platform_set_drvdata(dev, tc6387xb); + + if (pdata && pdata->enable) + pdata->enable(dev); + + dev_info(&dev->dev, "Toshiba tc6387xb initialised\n"); + + ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells, + ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL); + + if (!ret) + return 0; + + iounmap(tc6387xb->scr); +err_ioremap: + release_resource(&tc6387xb->rscr); +err_resource: + clk_put(clk32k); +err_no_clk: +err_no_irq: + kfree(tc6387xb); + return ret; +} + +static int tc6387xb_remove(struct platform_device *dev) +{ + struct tc6387xb *tc6387xb = platform_get_drvdata(dev); + + mfd_remove_devices(&dev->dev); + iounmap(tc6387xb->scr); + release_resource(&tc6387xb->rscr); + clk_disable_unprepare(tc6387xb->clk32k); + clk_put(tc6387xb->clk32k); + kfree(tc6387xb); + + return 0; +} + + +static struct platform_driver tc6387xb_platform_driver = { + .driver = { + .name = "tc6387xb", + }, + .probe = tc6387xb_probe, + .remove = tc6387xb_remove, + .suspend = tc6387xb_suspend, + .resume = tc6387xb_resume, +}; + +module_platform_driver(tc6387xb_platform_driver); + +MODULE_DESCRIPTION("Toshiba TC6387XB core driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Ian Molton"); +MODULE_ALIAS("platform:tc6387xb"); + |