mfd: driver for the T7L66XB TMIO SoC

This patchset provides support for the core functinality of the T7L66XB
SoC from Toshiba. Supported in this patchset is the IRQ MUX, MMC controller
and NAND flash controller.

Signed-off-by: Ian Molton <spyro@f2s.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

1 files changed, 409 insertions, 0 deletions

diff --git a/drivers/mfd/t7l66xb.c b/drivers/mfd/t7l66xb.c
new file mode 100644
index 000000000000..5be42054f739
--- /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");