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path: root/drivers/mfd/t7l66xb.c
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-rw-r--r--drivers/mfd/t7l66xb.c409
1 files changed, 409 insertions, 0 deletions
diff --git a/drivers/mfd/t7l66xb.c b/drivers/mfd/t7l66xb.c
new file mode 100644
index 00000000000..5be42054f73
--- /dev/null
+++ b/drivers/mfd/t7l66xb.c
@@ -0,0 +1,409 @@
+/*
+ *
+ * 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/io.h>
+#include <linux/irq.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,
+};
+
+#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;
+ 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_platform_data *pdata = dev->dev.platform_data;
+ struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
+ unsigned long flags;
+ u8 dev_ctl;
+
+ if (pdata->enable_clk32k)
+ pdata->enable_clk32k(dev);
+
+ 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);
+
+ return 0;
+}
+
+static int t7l66xb_mmc_disable(struct platform_device *mmc)
+{
+ struct platform_device *dev = to_platform_device(mmc->dev.parent);
+ struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
+ 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);
+
+ if (pdata->disable_clk32k)
+ pdata->disable_clk32k(dev);
+
+ return 0;
+}
+
+/*--------------------------------------------------------------------------*/
+
+const static struct resource t7l66xb_mmc_resources[] = {
+ {
+ .start = 0x800,
+ .end = 0x9ff,
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .start = 0x200,
+ .end = 0x2ff,
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .start = IRQ_T7L66XB_MMC,
+ .end = IRQ_T7L66XB_MMC,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+const static 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,
+ .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 = get_irq_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(unsigned int irq)
+{
+ struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
+ unsigned long flags;
+ u8 imr;
+
+ spin_lock_irqsave(&t7l66xb->lock, flags);
+ imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
+ imr |= 1 << (irq - t7l66xb->irq_base);
+ tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
+ spin_unlock_irqrestore(&t7l66xb->lock, flags);
+}
+
+static void t7l66xb_irq_unmask(unsigned int irq)
+{
+ struct t7l66xb *t7l66xb = get_irq_chip_data(irq);
+ unsigned long flags;
+ u8 imr;
+
+ spin_lock_irqsave(&t7l66xb->lock, flags);
+ imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
+ imr &= ~(1 << (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",
+ .ack = t7l66xb_irq_mask,
+ .mask = t7l66xb_irq_mask,
+ .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++) {
+ set_irq_chip(irq, &t7l66xb_chip);
+ set_irq_chip_data(irq, t7l66xb);
+ set_irq_handler(irq, handle_level_irq);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+#endif
+ }
+
+ set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
+ set_irq_data(t7l66xb->irq, t7l66xb);
+ set_irq_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;
+
+ set_irq_chained_handler(t7l66xb->irq, NULL);
+ set_irq_data(t7l66xb->irq, NULL);
+
+ for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, 0);
+#endif
+ set_irq_chip(irq, NULL);
+ set_irq_chip_data(irq, NULL);
+ }
+}
+
+/*--------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
+
+ if (pdata && pdata->suspend)
+ pdata->suspend(dev);
+
+ return 0;
+}
+
+static int t7l66xb_resume(struct platform_device *dev)
+{
+ struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
+
+ if (pdata && pdata->resume)
+ pdata->resume(dev);
+
+ 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;
+
+ 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;
+
+ 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, rscr->end - rscr->start + 1);
+ if (!t7l66xb->scr) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ 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].driver_data = pdata->nand_data;
+
+ ret = mfd_add_devices(dev, 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_noirq:
+err_request_scr:
+ 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);
+
+ t7l66xb_detach_irq(dev);
+ iounmap(t7l66xb->scr);
+ release_resource(&t7l66xb->rscr);
+ mfd_remove_devices(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,
+};
+
+/*--------------------------------------------------------------------------*/
+
+static int __init t7l66xb_init(void)
+{
+ int retval = 0;
+
+ retval = platform_driver_register(&t7l66xb_platform_driver);
+ return retval;
+}
+
+static void __exit t7l66xb_exit(void)
+{
+ platform_driver_unregister(&t7l66xb_platform_driver);
+}
+
+module_init(t7l66xb_init);
+module_exit(t7l66xb_exit);
+
+MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Ian Molton");
+MODULE_ALIAS("platform:t7l66xb");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 22:12:21 +0000