463 lines
11 KiB
C
463 lines
11 KiB
C
/*
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*
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* Toshiba T7L66XB core mfd support
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*
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* Copyright (c) 2005, 2007, 2008 Ian Molton
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* Copyright (c) 2008 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* T7L66 features:
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*
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* Supported in this driver:
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* SD/MMC
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* SM/NAND flash controller
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*
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* As yet not supported
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* GPIO interface (on NAND pins)
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* Serial interface
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* TFT 'interface converter'
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* PCMCIA interface logic
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tmio.h>
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#include <linux/mfd/t7l66xb.h>
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enum {
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T7L66XB_CELL_NAND,
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T7L66XB_CELL_MMC,
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};
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static const struct resource t7l66xb_mmc_resources[] = {
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{
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.start = 0x800,
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.end = 0x9ff,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = IRQ_T7L66XB_MMC,
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.end = IRQ_T7L66XB_MMC,
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.flags = IORESOURCE_IRQ,
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},
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};
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#define SCR_REVID 0x08 /* b Revision ID */
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#define SCR_IMR 0x42 /* b Interrupt Mask */
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#define SCR_DEV_CTL 0xe0 /* b Device control */
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#define SCR_ISR 0xe1 /* b Interrupt Status */
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#define SCR_GPO_OC 0xf0 /* b GPO output control */
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#define SCR_GPO_OS 0xf1 /* b GPO output enable */
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#define SCR_GPI_S 0xf2 /* w GPI status */
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#define SCR_APDC 0xf8 /* b Active pullup down ctrl */
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#define SCR_DEV_CTL_USB BIT(0) /* USB enable */
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#define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */
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/*--------------------------------------------------------------------------*/
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struct t7l66xb {
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void __iomem *scr;
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/* Lock to protect registers requiring read/modify/write ops. */
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spinlock_t lock;
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struct resource rscr;
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struct clk *clk48m;
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struct clk *clk32k;
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int irq;
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int irq_base;
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};
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/*--------------------------------------------------------------------------*/
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static int t7l66xb_mmc_enable(struct platform_device *mmc)
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{
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struct platform_device *dev = to_platform_device(mmc->dev.parent);
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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unsigned long flags;
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u8 dev_ctl;
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clk_enable(t7l66xb->clk32k);
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spin_lock_irqsave(&t7l66xb->lock, flags);
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dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
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dev_ctl |= SCR_DEV_CTL_MMC;
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tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
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spin_unlock_irqrestore(&t7l66xb->lock, flags);
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tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
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t7l66xb_mmc_resources[0].start & 0xfffe);
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return 0;
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}
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static int t7l66xb_mmc_disable(struct platform_device *mmc)
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{
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struct platform_device *dev = to_platform_device(mmc->dev.parent);
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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unsigned long flags;
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u8 dev_ctl;
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spin_lock_irqsave(&t7l66xb->lock, flags);
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dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
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dev_ctl &= ~SCR_DEV_CTL_MMC;
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tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);
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spin_unlock_irqrestore(&t7l66xb->lock, flags);
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clk_disable(t7l66xb->clk32k);
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return 0;
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}
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static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
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{
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struct platform_device *dev = to_platform_device(mmc->dev.parent);
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
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}
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static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
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{
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struct platform_device *dev = to_platform_device(mmc->dev.parent);
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
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}
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/*--------------------------------------------------------------------------*/
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static struct tmio_mmc_data t7166xb_mmc_data = {
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.hclk = 24000000,
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.set_pwr = t7l66xb_mmc_pwr,
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.set_clk_div = t7l66xb_mmc_clk_div,
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};
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static const struct resource t7l66xb_nand_resources[] = {
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{
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.start = 0xc00,
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.end = 0xc07,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = 0x0100,
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.end = 0x01ff,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = IRQ_T7L66XB_NAND,
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.end = IRQ_T7L66XB_NAND,
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct mfd_cell t7l66xb_cells[] = {
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[T7L66XB_CELL_MMC] = {
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.name = "tmio-mmc",
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.enable = t7l66xb_mmc_enable,
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.disable = t7l66xb_mmc_disable,
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.mfd_data = &t7166xb_mmc_data,
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.num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
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.resources = t7l66xb_mmc_resources,
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},
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[T7L66XB_CELL_NAND] = {
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.name = "tmio-nand",
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.num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
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.resources = t7l66xb_nand_resources,
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},
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};
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/*--------------------------------------------------------------------------*/
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/* Handle the T7L66XB interrupt mux */
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static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
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{
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struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
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unsigned int isr;
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unsigned int i, irq_base;
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irq_base = t7l66xb->irq_base;
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while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
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~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
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for (i = 0; i < T7L66XB_NR_IRQS; i++)
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if (isr & (1 << i))
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generic_handle_irq(irq_base + i);
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}
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static void t7l66xb_irq_mask(struct irq_data *data)
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{
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struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
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unsigned long flags;
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u8 imr;
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spin_lock_irqsave(&t7l66xb->lock, flags);
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imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
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imr |= 1 << (data->irq - t7l66xb->irq_base);
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tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
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spin_unlock_irqrestore(&t7l66xb->lock, flags);
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}
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static void t7l66xb_irq_unmask(struct irq_data *data)
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{
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struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
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unsigned long flags;
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u8 imr;
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spin_lock_irqsave(&t7l66xb->lock, flags);
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imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
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imr &= ~(1 << (data->irq - t7l66xb->irq_base));
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tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
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spin_unlock_irqrestore(&t7l66xb->lock, flags);
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}
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static struct irq_chip t7l66xb_chip = {
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.name = "t7l66xb",
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.irq_ack = t7l66xb_irq_mask,
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.irq_mask = t7l66xb_irq_mask,
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.irq_unmask = t7l66xb_irq_unmask,
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};
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/*--------------------------------------------------------------------------*/
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/* Install the IRQ handler */
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static void t7l66xb_attach_irq(struct platform_device *dev)
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{
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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unsigned int irq, irq_base;
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irq_base = t7l66xb->irq_base;
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for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
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irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
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irq_set_chip_data(irq, t7l66xb);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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#endif
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}
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irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
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irq_set_handler_data(t7l66xb->irq, t7l66xb);
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irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq);
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}
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static void t7l66xb_detach_irq(struct platform_device *dev)
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{
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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unsigned int irq, irq_base;
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irq_base = t7l66xb->irq_base;
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irq_set_chained_handler(t7l66xb->irq, NULL);
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irq_set_handler_data(t7l66xb->irq, NULL);
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for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
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#ifdef CONFIG_ARM
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set_irq_flags(irq, 0);
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#endif
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irq_set_chip(irq, NULL);
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irq_set_chip_data(irq, NULL);
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}
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}
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/*--------------------------------------------------------------------------*/
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#ifdef CONFIG_PM
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static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
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if (pdata && pdata->suspend)
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pdata->suspend(dev);
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clk_disable(t7l66xb->clk48m);
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return 0;
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}
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static int t7l66xb_resume(struct platform_device *dev)
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{
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
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clk_enable(t7l66xb->clk48m);
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if (pdata && pdata->resume)
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pdata->resume(dev);
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tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
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t7l66xb_mmc_resources[0].start & 0xfffe);
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return 0;
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}
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#else
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#define t7l66xb_suspend NULL
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#define t7l66xb_resume NULL
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#endif
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/*--------------------------------------------------------------------------*/
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static int t7l66xb_probe(struct platform_device *dev)
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{
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struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
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struct t7l66xb *t7l66xb;
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struct resource *iomem, *rscr;
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int ret;
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if (pdata == NULL)
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return -EINVAL;
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iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!iomem)
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return -EINVAL;
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t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
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if (!t7l66xb)
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return -ENOMEM;
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spin_lock_init(&t7l66xb->lock);
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platform_set_drvdata(dev, t7l66xb);
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ret = platform_get_irq(dev, 0);
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if (ret >= 0)
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t7l66xb->irq = ret;
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else
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goto err_noirq;
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t7l66xb->irq_base = pdata->irq_base;
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t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
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if (IS_ERR(t7l66xb->clk32k)) {
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ret = PTR_ERR(t7l66xb->clk32k);
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goto err_clk32k_get;
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}
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t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
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if (IS_ERR(t7l66xb->clk48m)) {
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ret = PTR_ERR(t7l66xb->clk48m);
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goto err_clk48m_get;
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}
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rscr = &t7l66xb->rscr;
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rscr->name = "t7l66xb-core";
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rscr->start = iomem->start;
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rscr->end = iomem->start + 0xff;
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rscr->flags = IORESOURCE_MEM;
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ret = request_resource(iomem, rscr);
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if (ret)
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goto err_request_scr;
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t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
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if (!t7l66xb->scr) {
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ret = -ENOMEM;
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goto err_ioremap;
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}
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clk_enable(t7l66xb->clk48m);
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if (pdata && pdata->enable)
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pdata->enable(dev);
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/* Mask all interrupts */
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tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);
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printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
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dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
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(unsigned long)iomem->start, t7l66xb->irq);
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t7l66xb_attach_irq(dev);
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t7l66xb_cells[T7L66XB_CELL_NAND].mfd_data = pdata->nand_data;
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ret = mfd_add_devices(&dev->dev, dev->id,
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t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
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iomem, t7l66xb->irq_base);
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if (!ret)
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return 0;
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t7l66xb_detach_irq(dev);
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iounmap(t7l66xb->scr);
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err_ioremap:
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release_resource(&t7l66xb->rscr);
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err_request_scr:
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clk_put(t7l66xb->clk48m);
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err_clk48m_get:
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clk_put(t7l66xb->clk32k);
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err_clk32k_get:
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err_noirq:
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kfree(t7l66xb);
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return ret;
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}
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static int t7l66xb_remove(struct platform_device *dev)
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{
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struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
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struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
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int ret;
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ret = pdata->disable(dev);
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clk_disable(t7l66xb->clk48m);
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clk_put(t7l66xb->clk48m);
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clk_disable(t7l66xb->clk32k);
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clk_put(t7l66xb->clk32k);
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t7l66xb_detach_irq(dev);
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iounmap(t7l66xb->scr);
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release_resource(&t7l66xb->rscr);
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mfd_remove_devices(&dev->dev);
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platform_set_drvdata(dev, NULL);
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kfree(t7l66xb);
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return ret;
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}
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static struct platform_driver t7l66xb_platform_driver = {
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.driver = {
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.name = "t7l66xb",
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.owner = THIS_MODULE,
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},
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.suspend = t7l66xb_suspend,
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.resume = t7l66xb_resume,
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.probe = t7l66xb_probe,
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.remove = t7l66xb_remove,
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};
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/*--------------------------------------------------------------------------*/
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static int __init t7l66xb_init(void)
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{
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int retval = 0;
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retval = platform_driver_register(&t7l66xb_platform_driver);
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return retval;
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}
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static void __exit t7l66xb_exit(void)
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{
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platform_driver_unregister(&t7l66xb_platform_driver);
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}
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module_init(t7l66xb_init);
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module_exit(t7l66xb_exit);
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MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Ian Molton");
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MODULE_ALIAS("platform:t7l66xb");
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