diff options
Diffstat (limited to 'drivers/mfd/tc6393xb.c')
| -rw-r--r-- | drivers/mfd/tc6393xb.c | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/drivers/mfd/tc6393xb.c b/drivers/mfd/tc6393xb.c new file mode 100644 index 000000000000..4d7192edefe1 --- /dev/null +++ b/drivers/mfd/tc6393xb.c @@ -0,0 +1,537 @@ +/* + * Toshiba TC6393XB SoC support + * + * Copyright(c) 2005-2006 Chris Humbert + * Copyright(c) 2005 Dirk Opfer + * Copyright(c) 2005 Ian Molton <spyro@f2s.com> + * Copyright(c) 2007 Dmitry Baryshkov + * + * Based on code written by Sharp/Lineo for 2.4 kernels + * Based on locomo.c + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/platform_device.h> +#include <linux/fb.h> +#include <linux/clk.h> +#include <linux/mfd/tc6393xb.h> +#include <linux/gpio.h> + +#define SCR_REVID 0x08 /* b Revision ID */ +#define SCR_ISR 0x50 /* b Interrupt Status */ +#define SCR_IMR 0x52 /* b Interrupt Mask */ +#define SCR_IRR 0x54 /* b Interrupt Routing */ +#define SCR_GPER 0x60 /* w GP Enable */ +#define SCR_GPI_SR(i) (0x64 + (i)) /* b3 GPI Status */ +#define SCR_GPI_IMR(i) (0x68 + (i)) /* b3 GPI INT Mask */ +#define SCR_GPI_EDER(i) (0x6c + (i)) /* b3 GPI Edge Detect Enable */ +#define SCR_GPI_LIR(i) (0x70 + (i)) /* b3 GPI Level Invert */ +#define SCR_GPO_DSR(i) (0x78 + (i)) /* b3 GPO Data Set */ +#define SCR_GPO_DOECR(i) (0x7c + (i)) /* b3 GPO Data OE Control */ +#define SCR_GP_IARCR(i) (0x80 + (i)) /* b3 GP Internal Active Register Control */ +#define SCR_GP_IARLCR(i) (0x84 + (i)) /* b3 GP INTERNAL Active Register Level Control */ +#define SCR_GPI_BCR(i) (0x88 + (i)) /* b3 GPI Buffer Control */ +#define SCR_GPA_IARCR 0x8c /* w GPa Internal Active Register Control */ +#define SCR_GPA_IARLCR 0x90 /* w GPa Internal Active Register Level Control */ +#define SCR_GPA_BCR 0x94 /* w GPa Buffer Control */ +#define SCR_CCR 0x98 /* w Clock Control */ +#define SCR_PLL2CR 0x9a /* w PLL2 Control */ +#define SCR_PLL1CR 0x9c /* l PLL1 Control */ +#define SCR_DIARCR 0xa0 /* b Device Internal Active Register Control */ +#define SCR_DBOCR 0xa1 /* b Device Buffer Off Control */ +#define SCR_FER 0xe0 /* b Function Enable */ +#define SCR_MCR 0xe4 /* w Mode Control */ +#define SCR_CONFIG 0xfc /* b Configuration Control */ +#define SCR_DEBUG 0xff /* b Debug */ + +#define SCR_CCR_CK32K BIT(0) +#define SCR_CCR_USBCK BIT(1) +#define SCR_CCR_UNK1 BIT(4) +#define SCR_CCR_MCLK_MASK (7 << 8) +#define SCR_CCR_MCLK_OFF (0 << 8) +#define SCR_CCR_MCLK_12 (1 << 8) +#define SCR_CCR_MCLK_24 (2 << 8) +#define SCR_CCR_MCLK_48 (3 << 8) +#define SCR_CCR_HCLK_MASK (3 << 12) +#define SCR_CCR_HCLK_24 (0 << 12) +#define SCR_CCR_HCLK_48 (1 << 12) + +#define SCR_FER_USBEN BIT(0) /* USB host enable */ +#define SCR_FER_LCDCVEN BIT(1) /* polysilicon TFT enable */ +#define SCR_FER_SLCDEN BIT(2) /* SLCD enable */ + +#define SCR_MCR_RDY_MASK (3 << 0) +#define SCR_MCR_RDY_OPENDRAIN (0 << 0) +#define SCR_MCR_RDY_TRISTATE (1 << 0) +#define SCR_MCR_RDY_PUSHPULL (2 << 0) +#define SCR_MCR_RDY_UNK BIT(2) +#define SCR_MCR_RDY_EN BIT(3) +#define SCR_MCR_INT_MASK (3 << 4) +#define SCR_MCR_INT_OPENDRAIN (0 << 4) +#define SCR_MCR_INT_TRISTATE (1 << 4) +#define SCR_MCR_INT_PUSHPULL (2 << 4) +#define SCR_MCR_INT_UNK BIT(6) +#define SCR_MCR_INT_EN BIT(7) +/* bits 8 - 16 are unknown */ + +#define TC_GPIO_BIT(i) (1 << (i & 0x7)) + +/*--------------------------------------------------------------------------*/ + +struct tc6393xb { + void __iomem *scr; + + struct gpio_chip gpio; + + struct clk *clk; /* 3,6 Mhz */ + + spinlock_t lock; /* protects RMW cycles */ + + struct { + u8 fer; + u16 ccr; + u8 gpi_bcr[3]; + u8 gpo_dsr[3]; + u8 gpo_doecr[3]; + } suspend_state; + + struct resource rscr; + struct resource *iomem; + int irq; + int irq_base; +}; + +/*--------------------------------------------------------------------------*/ + +static int tc6393xb_gpio_get(struct gpio_chip *chip, + unsigned offset) +{ + struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio); + + /* XXX: does dsr also represent inputs? */ + return ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8)) + & TC_GPIO_BIT(offset); +} + +static void __tc6393xb_gpio_set(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio); + u8 dsr; + + dsr = ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8)); + if (value) + dsr |= TC_GPIO_BIT(offset); + else + dsr &= ~TC_GPIO_BIT(offset); + + iowrite8(dsr, tc6393xb->scr + SCR_GPO_DSR(offset / 8)); +} + +static void tc6393xb_gpio_set(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio); + unsigned long flags; + + spin_lock_irqsave(&tc6393xb->lock, flags); + + __tc6393xb_gpio_set(chip, offset, value); + + spin_unlock_irqrestore(&tc6393xb->lock, flags); +} + +static int tc6393xb_gpio_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio); + unsigned long flags; + u8 doecr; + + spin_lock_irqsave(&tc6393xb->lock, flags); + + doecr = ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8)); + doecr &= ~TC_GPIO_BIT(offset); + iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8)); + + spin_unlock_irqrestore(&tc6393xb->lock, flags); + + return 0; +} + +static int tc6393xb_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio); + unsigned long flags; + u8 doecr; + + spin_lock_irqsave(&tc6393xb->lock, flags); + + __tc6393xb_gpio_set(chip, offset, value); + + doecr = ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8)); + doecr |= TC_GPIO_BIT(offset); + iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8)); + + spin_unlock_irqrestore(&tc6393xb->lock, flags); + + return 0; +} + +static int tc6393xb_register_gpio(struct tc6393xb *tc6393xb, int gpio_base) +{ + tc6393xb->gpio.label = "tc6393xb"; + tc6393xb->gpio.base = gpio_base; + tc6393xb->gpio.ngpio = 16; + tc6393xb->gpio.set = tc6393xb_gpio_set; + tc6393xb->gpio.get = tc6393xb_gpio_get; + tc6393xb->gpio.direction_input = tc6393xb_gpio_direction_input; + tc6393xb->gpio.direction_output = tc6393xb_gpio_direction_output; + + return gpiochip_add(&tc6393xb->gpio); +} + +/*--------------------------------------------------------------------------*/ + +static void +tc6393xb_irq(unsigned int irq, struct irq_desc *desc) +{ + struct tc6393xb *tc6393xb = get_irq_data(irq); + unsigned int isr; + unsigned int i, irq_base; + + irq_base = tc6393xb->irq_base; + + while ((isr = ioread8(tc6393xb->scr + SCR_ISR) & + ~ioread8(tc6393xb->scr + SCR_IMR))) + for (i = 0; i < TC6393XB_NR_IRQS; i++) { + if (isr & (1 << i)) + generic_handle_irq(irq_base + i); + } +} + +static void tc6393xb_irq_ack(unsigned int irq) +{ +} + +static void tc6393xb_irq_mask(unsigned int irq) +{ + struct tc6393xb *tc6393xb = get_irq_chip_data(irq); + unsigned long flags; + u8 imr; + + spin_lock_irqsave(&tc6393xb->lock, flags); + imr = ioread8(tc6393xb->scr + SCR_IMR); + imr |= 1 << (irq - tc6393xb->irq_base); + iowrite8(imr, tc6393xb->scr + SCR_IMR); + spin_unlock_irqrestore(&tc6393xb->lock, flags); +} + +static void tc6393xb_irq_unmask(unsigned int irq) +{ + struct tc6393xb *tc6393xb = get_irq_chip_data(irq); + unsigned long flags; + u8 imr; + + spin_lock_irqsave(&tc6393xb->lock, flags); + imr = ioread8(tc6393xb->scr + SCR_IMR); + imr &= ~(1 << (irq - tc6393xb->irq_base)); + iowrite8(imr, tc6393xb->scr + SCR_IMR); + spin_unlock_irqrestore(&tc6393xb->lock, flags); +} + +static struct irq_chip tc6393xb_chip = { + .name = "tc6393xb", + .ack = tc6393xb_irq_ack, + .mask = tc6393xb_irq_mask, + .unmask = tc6393xb_irq_unmask, +}; + +static void tc6393xb_attach_irq(struct platform_device *dev) +{ + struct tc6393xb *tc6393xb = platform_get_drvdata(dev); + unsigned int irq, irq_base; + + irq_base = tc6393xb->irq_base; + + for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) { + set_irq_chip(irq, &tc6393xb_chip); + set_irq_chip_data(irq, tc6393xb); + set_irq_handler(irq, handle_edge_irq); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + } + + set_irq_type(tc6393xb->irq, IRQT_FALLING); + set_irq_data(tc6393xb->irq, tc6393xb); + set_irq_chained_handler(tc6393xb->irq, tc6393xb_irq); +} + +static void tc6393xb_detach_irq(struct platform_device *dev) +{ + struct tc6393xb *tc6393xb = platform_get_drvdata(dev); + unsigned int irq, irq_base; + + set_irq_chained_handler(tc6393xb->irq, NULL); + set_irq_data(tc6393xb->irq, NULL); + + irq_base = tc6393xb->irq_base; + + for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) { + set_irq_flags(irq, 0); + set_irq_chip(irq, NULL); + set_irq_chip_data(irq, NULL); + } +} + +/*--------------------------------------------------------------------------*/ + +static int tc6393xb_hw_init(struct platform_device *dev) +{ + struct tc6393xb_platform_data *tcpd = dev->dev.platform_data; + struct tc6393xb *tc6393xb = platform_get_drvdata(dev); + int i; + + iowrite8(tc6393xb->suspend_state.fer, tc6393xb->scr + SCR_FER); + iowrite16(tcpd->scr_pll2cr, tc6393xb->scr + SCR_PLL2CR); + iowrite16(tc6393xb->suspend_state.ccr, tc6393xb->scr + SCR_CCR); + iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN | + SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN | + BIT(15), tc6393xb->scr + SCR_MCR); + iowrite16(tcpd->scr_gper, tc6393xb->scr + SCR_GPER); + iowrite8(0, tc6393xb->scr + SCR_IRR); + iowrite8(0xbf, tc6393xb->scr + SCR_IMR); + + for (i = 0; i < 3; i++) { + iowrite8(tc6393xb->suspend_state.gpo_dsr[i], + tc6393xb->scr + SCR_GPO_DSR(i)); + iowrite8(tc6393xb->suspend_state.gpo_doecr[i], + tc6393xb->scr + SCR_GPO_DOECR(i)); + iowrite8(tc6393xb->suspend_state.gpi_bcr[i], + tc6393xb->scr + SCR_GPI_BCR(i)); + } + + return 0; +} + +static int __devinit tc6393xb_probe(struct platform_device *dev) +{ + struct tc6393xb_platform_data *tcpd = dev->dev.platform_data; + struct tc6393xb *tc6393xb; + struct resource *iomem; + struct resource *rscr; + int retval, temp; + int i; + + iomem = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!iomem) + return -EINVAL; + + tc6393xb = kzalloc(sizeof *tc6393xb, GFP_KERNEL); + if (!tc6393xb) { + retval = -ENOMEM; + goto err_kzalloc; + } + + spin_lock_init(&tc6393xb->lock); + + platform_set_drvdata(dev, tc6393xb); + tc6393xb->iomem = iomem; + tc6393xb->irq = platform_get_irq(dev, 0); + tc6393xb->irq_base = tcpd->irq_base; + + tc6393xb->clk = clk_get(&dev->dev, "GPIO27_CLK" /* "CK3P6MI" */); + if (IS_ERR(tc6393xb->clk)) { + retval = PTR_ERR(tc6393xb->clk); + goto err_clk_get; + } + + rscr = &tc6393xb->rscr; + rscr->name = "tc6393xb-core"; + rscr->start = iomem->start; + rscr->end = iomem->start + 0xff; + rscr->flags = IORESOURCE_MEM; + + retval = request_resource(iomem, rscr); + if (retval) + goto err_request_scr; + + tc6393xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1); + if (!tc6393xb->scr) { + retval = -ENOMEM; + goto err_ioremap; + } + + retval = clk_enable(tc6393xb->clk); + if (retval) + goto err_clk_enable; + + retval = tcpd->enable(dev); + if (retval) + goto err_enable; + + tc6393xb->suspend_state.fer = 0; + for (i = 0; i < 3; i++) { + tc6393xb->suspend_state.gpo_dsr[i] = + (tcpd->scr_gpo_dsr >> (8 * i)) & 0xff; + tc6393xb->suspend_state.gpo_doecr[i] = + (tcpd->scr_gpo_doecr >> (8 * i)) & 0xff; + } + /* + * It may be necessary to change this back to + * platform-dependant code + */ + tc6393xb->suspend_state.ccr = SCR_CCR_UNK1 | + SCR_CCR_HCLK_48; + + retval = tc6393xb_hw_init(dev); + if (retval) + goto err_hw_init; + + printk(KERN_INFO "Toshiba tc6393xb revision %d at 0x%08lx, irq %d\n", + ioread8(tc6393xb->scr + SCR_REVID), + (unsigned long) iomem->start, tc6393xb->irq); + + tc6393xb->gpio.base = -1; + + if (tcpd->gpio_base >= 0) { + retval = tc6393xb_register_gpio(tc6393xb, tcpd->gpio_base); + if (retval) + goto err_gpio_add; + } + + if (tc6393xb->irq) + tc6393xb_attach_irq(dev); + + return 0; + + if (tc6393xb->irq) + tc6393xb_detach_irq(dev); + +err_gpio_add: + if (tc6393xb->gpio.base != -1) + temp = gpiochip_remove(&tc6393xb->gpio); +err_hw_init: + tcpd->disable(dev); +err_clk_enable: + clk_disable(tc6393xb->clk); +err_enable: + iounmap(tc6393xb->scr); +err_ioremap: + release_resource(&tc6393xb->rscr); +err_request_scr: + clk_put(tc6393xb->clk); +err_clk_get: + kfree(tc6393xb); +err_kzalloc: + return retval; +} + +static int __devexit tc6393xb_remove(struct platform_device *dev) +{ + struct tc6393xb_platform_data *tcpd = dev->dev.platform_data; + struct tc6393xb *tc6393xb = platform_get_drvdata(dev); + int ret; + + if (tc6393xb->irq) + tc6393xb_detach_irq(dev); + + if (tc6393xb->gpio.base != -1) { + ret = gpiochip_remove(&tc6393xb->gpio); + if (ret) { + dev_err(&dev->dev, "Can't remove gpio chip: %d\n", ret); + return ret; + } + } + + ret = tcpd->disable(dev); + + clk_disable(tc6393xb->clk); + + iounmap(tc6393xb->scr); + + release_resource(&tc6393xb->rscr); + + platform_set_drvdata(dev, NULL); + + clk_put(tc6393xb->clk); + + kfree(tc6393xb); + + return ret; +} + +#ifdef CONFIG_PM +static int tc6393xb_suspend(struct platform_device *dev, pm_message_t state) +{ + struct tc6393xb_platform_data *tcpd = dev->dev.platform_data; + struct tc6393xb *tc6393xb = platform_get_drvdata(dev); + int i; + + + tc6393xb->suspend_state.ccr = ioread16(tc6393xb->scr + SCR_CCR); + tc6393xb->suspend_state.fer = ioread8(tc6393xb->scr + SCR_FER); + + for (i = 0; i < 3; i++) { + tc6393xb->suspend_state.gpo_dsr[i] = + ioread8(tc6393xb->scr + SCR_GPO_DSR(i)); + tc6393xb->suspend_state.gpo_doecr[i] = + ioread8(tc6393xb->scr + SCR_GPO_DOECR(i)); + tc6393xb->suspend_state.gpi_bcr[i] = + ioread8(tc6393xb->scr + SCR_GPI_BCR(i)); + } + + return tcpd->suspend(dev); +} + +static int tc6393xb_resume(struct platform_device *dev) +{ + struct tc6393xb_platform_data *tcpd = dev->dev.platform_data; + int ret = tcpd->resume(dev); + + if (ret) + return ret; + + return tc6393xb_hw_init(dev); +} +#else +#define tc6393xb_suspend NULL +#define tc6393xb_resume NULL +#endif + +static struct platform_driver tc6393xb_driver = { + .probe = tc6393xb_probe, + .remove = __devexit_p(tc6393xb_remove), + .suspend = tc6393xb_suspend, + .resume = tc6393xb_resume, + + .driver = { + .name = "tc6393xb", + .owner = THIS_MODULE, + }, +}; + +static int __init tc6393xb_init(void) +{ + return platform_driver_register(&tc6393xb_driver); +} + +static void __exit tc6393xb_exit(void) +{ + platform_driver_unregister(&tc6393xb_driver); +} + +subsys_initcall(tc6393xb_init); +module_exit(tc6393xb_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov and Dirk Opfer"); +MODULE_DESCRIPTION("tc6393xb Toshiba Mobile IO Controller"); +MODULE_ALIAS("platform:tc6393xb"); |