1 files changed, 432 insertions, 0 deletions

diff --git a/drivers/mfd/t7l66xb.c b/drivers/mfd/t7l66xb.c
new file mode 100644
index 000000000..663ffd4b8
--- /dev/null
+++ b/drivers/mfd/t7l66xb.c
@@ -0,0 +1,432 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Toshiba T7L66XB core mfd support
+ *
+ * Copyright (c) 2005, 2007, 2008 Ian Molton
+ * Copyright (c) 2008 Dmitry Baryshkov
+ *
+ * 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[] = {
+	DEFINE_RES_MEM(0x800, 0x200),
+	DEFINE_RES_IRQ(IRQ_T7L66XB_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. */
+	raw_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 t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
+	unsigned long flags;
+	u8 dev_ctl;
+	int ret;
+
+	ret = clk_prepare_enable(t7l66xb->clk32k);
+	if (ret)
+		return ret;
+
+	raw_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);
+
+	raw_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 t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
+	unsigned long flags;
+	u8 dev_ctl;
+
+	raw_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);
+
+	raw_spin_unlock_irqrestore(&t7l66xb->lock, flags);
+
+	clk_disable_unprepare(t7l66xb->clk32k);
+
+	return 0;
+}
+
+static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
+{
+	struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
+
+	tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
+}
+
+static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
+{
+	struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);
+
+	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(struct irq_desc *desc)
+{
+	struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
+	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;
+
+	raw_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);
+	raw_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;
+
+	raw_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);
+	raw_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);
+	}
+
+	irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
+	irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);
+}
+
+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_and_data(t7l66xb->irq, NULL, NULL);
+
+	for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
+		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_get_platdata(&dev->dev);
+
+	if (pdata && pdata->suspend)
+		pdata->suspend(dev);
+	clk_disable_unprepare(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_get_platdata(&dev->dev);
+	int ret;
+
+	ret = clk_prepare_enable(t7l66xb->clk48m);
+	if (ret)
+		return ret;
+
+	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_get_platdata(&dev->dev);
+	struct t7l66xb *t7l66xb;
+	struct resource *iomem, *rscr;
+	int ret;
+
+	if (!pdata)
+		return -EINVAL;
+
+	iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (!iomem)
+		return -EINVAL;
+
+	t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
+	if (!t7l66xb)
+		return -ENOMEM;
+
+	raw_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;
+	}
+
+	ret = clk_prepare_enable(t7l66xb->clk48m);
+	if (ret)
+		goto err_clk_enable;
+
+	if (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, NULL);
+
+	if (!ret)
+		return 0;
+
+	t7l66xb_detach_irq(dev);
+	clk_disable_unprepare(t7l66xb->clk48m);
+err_clk_enable:
+	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 *t7l66xb = platform_get_drvdata(dev);
+
+	clk_disable_unprepare(t7l66xb->clk48m);
+	clk_put(t7l66xb->clk48m);
+	clk_disable_unprepare(t7l66xb->clk32k);
+	clk_put(t7l66xb->clk32k);
+	t7l66xb_detach_irq(dev);
+	iounmap(t7l66xb->scr);
+	release_resource(&t7l66xb->rscr);
+	mfd_remove_devices(&dev->dev);
+	kfree(t7l66xb);
+
+	return 0;
+}
+
+static struct platform_driver t7l66xb_platform_driver = {
+	.driver = {
+		.name	= "t7l66xb",
+	},
+	.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");