/* * * Toshiba T7L66XB core mfd support * * Copyright (c) 2005, 2007, 2008 Ian Molton * Copyright (c) 2008 Dmitry Baryshkov * * 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. * * T7L66 features: * * Supported in this driver: * SD/MMC * SM/NAND flash controller * * As yet not supported * GPIO interface (on NAND pins) * Serial interface * TFT 'interface converter' * PCMCIA interface logic */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/err.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/irq.h> #include <linux/clk.h> #include <linux/platform_device.h> #include <linux/mfd/core.h> #include <linux/mfd/tmio.h> #include <linux/mfd/t7l66xb.h> enum { T7L66XB_CELL_NAND, T7L66XB_CELL_MMC, }; static const struct resource t7l66xb_mmc_resources[] = { { .start = 0x800, .end = 0x9ff, .flags = IORESOURCE_MEM, }, { .start = IRQ_T7L66XB_MMC, .end = IRQ_T7L66XB_MMC, .flags = IORESOURCE_IRQ, }, }; #define SCR_REVID 0x08 /* b Revision ID */ #define SCR_IMR 0x42 /* b Interrupt Mask */ #define SCR_DEV_CTL 0xe0 /* b Device control */ #define SCR_ISR 0xe1 /* b Interrupt Status */ #define SCR_GPO_OC 0xf0 /* b GPO output control */ #define SCR_GPO_OS 0xf1 /* b GPO output enable */ #define SCR_GPI_S 0xf2 /* w GPI status */ #define SCR_APDC 0xf8 /* b Active pullup down ctrl */ #define SCR_DEV_CTL_USB BIT(0) /* USB enable */ #define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */ /*--------------------------------------------------------------------------*/ struct t7l66xb { void __iomem *scr; /* Lock to protect registers requiring read/modify/write ops. */ spinlock_t lock; struct resource rscr; struct clk *clk48m; struct clk *clk32k; int irq; int irq_base; }; /*--------------------------------------------------------------------------*/ static int t7l66xb_mmc_enable(struct platform_device *mmc) { struct platform_device *dev = to_platform_device(mmc->dev.parent); struct t7l66xb *t7l66xb = platform_get_drvdata(dev); unsigned long flags; u8 dev_ctl; clk_enable(t7l66xb->clk32k); spin_lock_irqsave(&t7l66xb->lock, flags); dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL); dev_ctl |= SCR_DEV_CTL_MMC; tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL); spin_unlock_irqrestore(&t7l66xb->lock, flags); tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0, t7l66xb_mmc_resources[0].start & 0xfffe); return 0; } static int t7l66xb_mmc_disable(struct platform_device *mmc) { struct platform_device *dev = to_platform_device(mmc->dev.parent); struct t7l66xb *t7l66xb = platform_get_drvdata(dev); unsigned long flags; u8 dev_ctl; spin_lock_irqsave(&t7l66xb->lock, flags); dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL); dev_ctl &= ~SCR_DEV_CTL_MMC; tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL); spin_unlock_irqrestore(&t7l66xb->lock, flags); clk_disable(t7l66xb->clk32k); return 0; } static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state) { struct platform_device *dev = to_platform_device(mmc->dev.parent); struct t7l66xb *t7l66xb = platform_get_drvdata(dev); tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state); } static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state) { struct platform_device *dev = to_platform_device(mmc->dev.parent); struct t7l66xb *t7l66xb = platform_get_drvdata(dev); tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state); } /*--------------------------------------------------------------------------*/ static struct tmio_mmc_data t7166xb_mmc_data = { .hclk = 24000000, .set_pwr = t7l66xb_mmc_pwr, .set_clk_div = t7l66xb_mmc_clk_div, }; static const struct resource t7l66xb_nand_resources[] = { { .start = 0xc00, .end = 0xc07, .flags = IORESOURCE_MEM, }, { .start = 0x0100, .end = 0x01ff, .flags = IORESOURCE_MEM, }, { .start = IRQ_T7L66XB_NAND, .end = IRQ_T7L66XB_NAND, .flags = IORESOURCE_IRQ, }, }; static struct mfd_cell t7l66xb_cells[] = { [T7L66XB_CELL_MMC] = { .name = "tmio-mmc", .enable = t7l66xb_mmc_enable, .disable = t7l66xb_mmc_disable, .platform_data = &t7166xb_mmc_data, .pdata_size = sizeof(t7166xb_mmc_data), .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources), .resources = t7l66xb_mmc_resources, }, [T7L66XB_CELL_NAND] = { .name = "tmio-nand", .num_resources = ARRAY_SIZE(t7l66xb_nand_resources), .resources = t7l66xb_nand_resources, }, }; /*--------------------------------------------------------------------------*/ /* Handle the T7L66XB interrupt mux */ static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc) { struct t7l66xb *t7l66xb = irq_get_handler_data(irq); unsigned int isr; unsigned int i, irq_base; irq_base = t7l66xb->irq_base; while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) & ~tmio_ioread8(t7l66xb->scr + SCR_IMR))) for (i = 0; i < T7L66XB_NR_IRQS; i++) if (isr & (1 << i)) generic_handle_irq(irq_base + i); } static void t7l66xb_irq_mask(struct irq_data *data) { struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data); unsigned long flags; u8 imr; spin_lock_irqsave(&t7l66xb->lock, flags); imr = tmio_ioread8(t7l66xb->scr + SCR_IMR); imr |= 1 << (data->irq - t7l66xb->irq_base); tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR); spin_unlock_irqrestore(&t7l66xb->lock, flags); } static void t7l66xb_irq_unmask(struct irq_data *data) { struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data); unsigned long flags; u8 imr; spin_lock_irqsave(&t7l66xb->lock, flags); imr = tmio_ioread8(t7l66xb->scr + SCR_IMR); imr &= ~(1 << (data->irq - t7l66xb->irq_base)); tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR); spin_unlock_irqrestore(&t7l66xb->lock, flags); } static struct irq_chip t7l66xb_chip = { .name = "t7l66xb", .irq_ack = t7l66xb_irq_mask, .irq_mask = t7l66xb_irq_mask, .irq_unmask = t7l66xb_irq_unmask, }; /*--------------------------------------------------------------------------*/ /* Install the IRQ handler */ static void t7l66xb_attach_irq(struct platform_device *dev) { struct t7l66xb *t7l66xb = platform_get_drvdata(dev); unsigned int irq, irq_base; irq_base = t7l66xb->irq_base; for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) { irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq); irq_set_chip_data(irq, t7l66xb); #ifdef CONFIG_ARM set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); #endif } irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING); irq_set_handler_data(t7l66xb->irq, t7l66xb); irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq); } static void t7l66xb_detach_irq(struct platform_device *dev) { struct t7l66xb *t7l66xb = platform_get_drvdata(dev); unsigned int irq, irq_base; irq_base = t7l66xb->irq_base; irq_set_chained_handler(t7l66xb->irq, NULL); irq_set_handler_data(t7l66xb->irq, NULL); for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) { #ifdef CONFIG_ARM set_irq_flags(irq, 0); #endif irq_set_chip(irq, NULL); irq_set_chip_data(irq, NULL); } } /*--------------------------------------------------------------------------*/ #ifdef CONFIG_PM static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state) { struct t7l66xb *t7l66xb = platform_get_drvdata(dev); struct t7l66xb_platform_data *pdata = dev->dev.platform_data; if (pdata && pdata->suspend) pdata->suspend(dev); clk_disable(t7l66xb->clk48m); return 0; } static int t7l66xb_resume(struct platform_device *dev) { struct t7l66xb *t7l66xb = platform_get_drvdata(dev); struct t7l66xb_platform_data *pdata = dev->dev.platform_data; clk_enable(t7l66xb->clk48m); if (pdata && pdata->resume) pdata->resume(dev); tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0, t7l66xb_mmc_resources[0].start & 0xfffe); return 0; } #else #define t7l66xb_suspend NULL #define t7l66xb_resume NULL #endif /*--------------------------------------------------------------------------*/ static int t7l66xb_probe(struct platform_device *dev) { struct t7l66xb_platform_data *pdata = dev->dev.platform_data; struct t7l66xb *t7l66xb; struct resource *iomem, *rscr; int ret; if (pdata == NULL) return -EINVAL; iomem = platform_get_resource(dev, IORESOURCE_MEM, 0); if (!iomem) return -EINVAL; t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL); if (!t7l66xb) return -ENOMEM; spin_lock_init(&t7l66xb->lock); platform_set_drvdata(dev, t7l66xb); ret = platform_get_irq(dev, 0); if (ret >= 0) t7l66xb->irq = ret; else goto err_noirq; t7l66xb->irq_base = pdata->irq_base; t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K"); if (IS_ERR(t7l66xb->clk32k)) { ret = PTR_ERR(t7l66xb->clk32k); goto err_clk32k_get; } t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M"); if (IS_ERR(t7l66xb->clk48m)) { ret = PTR_ERR(t7l66xb->clk48m); goto err_clk48m_get; } rscr = &t7l66xb->rscr; rscr->name = "t7l66xb-core"; rscr->start = iomem->start; rscr->end = iomem->start + 0xff; rscr->flags = IORESOURCE_MEM; ret = request_resource(iomem, rscr); if (ret) goto err_request_scr; t7l66xb->scr = ioremap(rscr->start, resource_size(rscr)); if (!t7l66xb->scr) { ret = -ENOMEM; goto err_ioremap; } clk_enable(t7l66xb->clk48m); if (pdata && pdata->enable) pdata->enable(dev); /* Mask all interrupts */ tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR); printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n", dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID), (unsigned long)iomem->start, t7l66xb->irq); t7l66xb_attach_irq(dev); t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data; t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data); ret = mfd_add_devices(&dev->dev, dev->id, t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells), iomem, t7l66xb->irq_base); if (!ret) return 0; t7l66xb_detach_irq(dev); iounmap(t7l66xb->scr); err_ioremap: release_resource(&t7l66xb->rscr); err_request_scr: clk_put(t7l66xb->clk48m); err_clk48m_get: clk_put(t7l66xb->clk32k); err_clk32k_get: err_noirq: kfree(t7l66xb); return ret; } static int t7l66xb_remove(struct platform_device *dev) { struct t7l66xb_platform_data *pdata = dev->dev.platform_data; struct t7l66xb *t7l66xb = platform_get_drvdata(dev); int ret; ret = pdata->disable(dev); clk_disable(t7l66xb->clk48m); clk_put(t7l66xb->clk48m); clk_disable(t7l66xb->clk32k); clk_put(t7l66xb->clk32k); t7l66xb_detach_irq(dev); iounmap(t7l66xb->scr); release_resource(&t7l66xb->rscr); mfd_remove_devices(&dev->dev); platform_set_drvdata(dev, NULL); kfree(t7l66xb); return ret; } static struct platform_driver t7l66xb_platform_driver = { .driver = { .name = "t7l66xb", .owner = THIS_MODULE, }, .suspend = t7l66xb_suspend, .resume = t7l66xb_resume, .probe = t7l66xb_probe, .remove = t7l66xb_remove, }; /*--------------------------------------------------------------------------*/ module_platform_driver(t7l66xb_platform_driver); MODULE_DESCRIPTION("Toshiba T7L66XB core driver"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Ian Molton"); MODULE_ALIAS("platform:t7l66xb");