sm501.c

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{
	kfree(to_sm_device(to_platform_device(dev)));
}

/* sm501_create_subdev
 *
 * Create a skeleton platform device with resources for passing to a
 * sub-driver
*/

static struct platform_device *
sm501_create_subdev(struct sm501_devdata *sm,
		    char *name, unsigned int res_count)
{
	struct sm501_device *smdev;

	smdev = kzalloc(sizeof(struct sm501_device) +
			sizeof(struct resource) * res_count, GFP_KERNEL);
	if (!smdev)
		return NULL;

	smdev->pdev.dev.release = sm501_device_release;

	smdev->pdev.name = name;
	smdev->pdev.id = sm->pdev_id;
	smdev->pdev.resource = (struct resource *)(smdev+1);
	smdev->pdev.num_resources = res_count;

	smdev->pdev.dev.parent = sm->dev;

	return &smdev->pdev;
}

/* sm501_register_device
 *
 * Register a platform device created with sm501_create_subdev()
*/

static int sm501_register_device(struct sm501_devdata *sm,
				 struct platform_device *pdev)
{
	struct sm501_device *smdev = to_sm_device(pdev);
	int ptr;
	int ret;

	for (ptr = 0; ptr < pdev->num_resources; ptr++) {
		printk("%s[%d] flags %08lx: %08llx..%08llx\n",
		       pdev->name, ptr,
		       pdev->resource[ptr].flags,
		       (unsigned long long)pdev->resource[ptr].start,
		       (unsigned long long)pdev->resource[ptr].end);
	}

	ret = platform_device_register(pdev);

	if (ret >= 0) {
		dev_dbg(sm->dev, "registered %s\n", pdev->name);
		list_add_tail(&smdev->list, &sm->devices);
	} else
		dev_err(sm->dev, "error registering %s (%d)\n",
			pdev->name, ret);

	return ret;
}

/* sm501_create_subio
 *
 * Fill in an IO resource for a sub device
*/

static void sm501_create_subio(struct sm501_devdata *sm,
			       struct resource *res,
			       resource_size_t offs,
			       resource_size_t size)
{
	res->flags = IORESOURCE_MEM;
	res->parent = sm->io_res;
	res->start = sm->io_res->start + offs;
	res->end = res->start + size - 1;
}

/* sm501_create_mem
 *
 * Fill in an MEM resource for a sub device
*/

static void sm501_create_mem(struct sm501_devdata *sm,
			     struct resource *res,
			     resource_size_t *offs,
			     resource_size_t size)
{
	*offs -= size;		/* adjust memory size */

	res->flags = IORESOURCE_MEM;
	res->parent = sm->mem_res;
	res->start = sm->mem_res->start + *offs;
	res->end = res->start + size - 1;
}

/* sm501_create_irq
 *
 * Fill in an IRQ resource for a sub device
*/

static void sm501_create_irq(struct sm501_devdata *sm,
			     struct resource *res)
{
	res->flags = IORESOURCE_IRQ;
	res->parent = NULL;
	res->start = res->end = sm->irq;
}

static int sm501_register_usbhost(struct sm501_devdata *sm,
				  resource_size_t *mem_avail)
{
	struct platform_device *pdev;

	pdev = sm501_create_subdev(sm, "sm501-usb", 3);
	if (!pdev)
		return -ENOMEM;

	sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
	sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
	sm501_create_irq(sm, &pdev->resource[2]);

	return sm501_register_device(sm, pdev);
}

static int sm501_register_display(struct sm501_devdata *sm,
				  resource_size_t *mem_avail)
{
	struct platform_device *pdev;

	pdev = sm501_create_subdev(sm, "sm501-fb", 4);
	if (!pdev)
		return -ENOMEM;

	sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
	sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
	sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
	sm501_create_irq(sm, &pdev->resource[3]);

	return sm501_register_device(sm, pdev);
}

/* sm501_dbg_regs
 *
 * Debug attribute to attach to parent device to show core registers
*/

static ssize_t sm501_dbg_regs(struct device *dev,
			      struct device_attribute *attr, char *buff)
{
	struct sm501_devdata *sm = dev_get_drvdata(dev)	;
	unsigned int reg;
	char *ptr = buff;
	int ret;

	for (reg = 0x00; reg < 0x70; reg += 4) {
		ret = sprintf(ptr, "%08x = %08x\n",
			      reg, readl(sm->regs + reg));
		ptr += ret;
	}

	return ptr - buff;
}


static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);

/* sm501_init_reg
 *
 * Helper function for the init code to setup a register
 *
 * clear the bits which are set in r->mask, and then set
 * the bits set in r->set.
*/

static inline void sm501_init_reg(struct sm501_devdata *sm,
				  unsigned long reg,
				  struct sm501_reg_init *r)
{
	unsigned long tmp;

	tmp = readl(sm->regs + reg);
	tmp &= ~r->mask;
	tmp |= r->set;
	writel(tmp, sm->regs + reg);
}

/* sm501_init_regs
 *
 * Setup core register values
*/

static void sm501_init_regs(struct sm501_devdata *sm,
			    struct sm501_initdata *init)
{
	sm501_misc_control(sm->dev,
			   init->misc_control.set,
			   init->misc_control.mask);

	sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
	sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
	sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);

	if (init->m1xclk) {
		dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
		sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
	}

	if (init->mclk) {
		dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
		sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
	}

}

/* Check the PLL sources for the M1CLK and M1XCLK
 *
 * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
 * there is a risk (see errata AB-5) that the SM501 will cease proper
 * function. If this happens, then it is likely the SM501 will
 * hang the system.
*/

static int sm501_check_clocks(struct sm501_devdata *sm)
{
	unsigned long pwrmode = readl(sm->regs + SM501_CURRENT_CLOCK);
	unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
	unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);

	return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
}

static unsigned int sm501_mem_local[] = {
	[0]	= 4*1024*1024,
	[1]	= 8*1024*1024,
	[2]	= 16*1024*1024,
	[3]	= 32*1024*1024,
	[4]	= 64*1024*1024,
	[5]	= 2*1024*1024,
};

/* sm501_init_dev
 *
 * Common init code for an SM501
*/

static int sm501_init_dev(struct sm501_devdata *sm)
{
	resource_size_t mem_avail;
	unsigned long dramctrl;
	unsigned long devid;
	int ret;

	mutex_init(&sm->clock_lock);
	spin_lock_init(&sm->reg_lock);

	INIT_LIST_HEAD(&sm->devices);

	devid = readl(sm->regs + SM501_DEVICEID);

	if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
		dev_err(sm->dev, "incorrect device id %08lx\n", devid);
		return -EINVAL;
	}

	dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
	mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];

	dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
		 sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);

	sm501_dump_gate(sm);

	ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
	if (ret)
		dev_err(sm->dev, "failed to create debug regs file\n");

	sm501_dump_clk(sm);

	/* check to see if we have some device initialisation */

	if (sm->platdata) {
		struct sm501_platdata *pdata = sm->platdata;

		if (pdata->init) {
			sm501_init_regs(sm, sm->platdata->init);

			if (pdata->init->devices & SM501_USE_USB_HOST)
				sm501_register_usbhost(sm, &mem_avail);
		}
	}

	ret = sm501_check_clocks(sm);
	if (ret) {
		dev_err(sm->dev, "M1X and M clocks sourced from different "
					"PLLs\n");
		return -EINVAL;
	}

	/* always create a framebuffer */
	sm501_register_display(sm, &mem_avail);

	return 0;
}

static int sm501_plat_probe(struct platform_device *dev)
{
	struct sm501_devdata *sm;
	int err;

	sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
	if (sm == NULL) {
		dev_err(&dev->dev, "no memory for device data\n");
		err = -ENOMEM;
		goto err1;
	}

	sm->dev = &dev->dev;
	sm->pdev_id = dev->id;
	sm->irq = platform_get_irq(dev, 0);
	sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
	sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
	sm->platdata = dev->dev.platform_data;

	if (sm->irq < 0) {
		dev_err(&dev->dev, "failed to get irq resource\n");
		err = sm->irq;
		goto err_res;
	}

	if (sm->io_res == NULL || sm->mem_res == NULL) {
		dev_err(&dev->dev, "failed to get IO resource\n");
		err = -ENOENT;
		goto err_res;
	}

	sm->regs_claim = request_mem_region(sm->io_res->start,
					    0x100, "sm501");

	if (sm->regs_claim == NULL) {
		dev_err(&dev->dev, "cannot claim registers\n");
		err= -EBUSY;
		goto err_res;
	}

	platform_set_drvdata(dev, sm);

	sm->regs = ioremap(sm->io_res->start,
			   (sm->io_res->end - sm->io_res->start) - 1);

	if (sm->regs == NULL) {
		dev_err(&dev->dev, "cannot remap registers\n");
		err = -EIO;
		goto err_claim;
	}

	return sm501_init_dev(sm);

 err_claim:
	release_resource(sm->regs_claim);
	kfree(sm->regs_claim);
 err_res:
	kfree(sm);
 err1:
	return err;

}

#ifdef CONFIG_PM
/* power management support */

static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct sm501_devdata *sm = platform_get_drvdata(pdev);

	sm->in_suspend = 1;
	sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);

	sm501_dump_regs(sm);
	return 0;
}

static int sm501_plat_resume(struct platform_device *pdev)
{
	struct sm501_devdata *sm = platform_get_drvdata(pdev);

	sm501_dump_regs(sm);
	sm501_dump_gate(sm);
	sm501_dump_clk(sm);

	/* check to see if we are in the same state as when suspended */

	if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
		dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
		writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);

		/* our suspend causes the controller state to change,
		 * either by something attempting setup, power loss,
		 * or an external reset event on power change */

		if (sm->platdata && sm->platdata->init) {
			sm501_init_regs(sm, sm->platdata->init);
		}
	}

	/* dump our state from resume */

	sm501_dump_regs(sm);
	sm501_dump_clk(sm);

	sm->in_suspend = 0;

	return 0;
}
#else
#define sm501_plat_suspend NULL
#define sm501_plat_resume NULL
#endif

/* Initialisation data for PCI devices */

static struct sm501_initdata sm501_pci_initdata = {
	.gpio_high	= {
		.set	= 0x3F000000,		/* 24bit panel */
		.mask	= 0x0,
	},
	.misc_timing	= {
		.set	= 0x010100,		/* SDRAM timing */
		.mask	= 0x1F1F00,
	},
	.misc_control	= {
		.set	= SM501_MISC_PNL_24BIT,
		.mask	= 0,
	},

	.devices	= SM501_USE_ALL,

	/* Errata AB-3 says that 72MHz is the fastest available
	 * for 33MHZ PCI with proper bus-mastering operation */

	.mclk		= 72 * MHZ,
	.m1xclk		= 144 * MHZ,
};

static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
	.flags		= (SM501FB_FLAG_USE_INIT_MODE |
			   SM501FB_FLAG_USE_HWCURSOR |
			   SM501FB_FLAG_USE_HWACCEL |
			   SM501FB_FLAG_DISABLE_AT_EXIT),
};

static struct sm501_platdata_fb sm501_fb_pdata = {
	.fb_route	= SM501_FB_OWN,
	.fb_crt		= &sm501_pdata_fbsub,
	.fb_pnl		= &sm501_pdata_fbsub,
};

static struct sm501_platdata sm501_pci_platdata = {
	.init		= &sm501_pci_initdata,
	.fb		= &sm501_fb_pdata,
};

static int sm501_pci_probe(struct pci_dev *dev,
			   const struct pci_device_id *id)
{
	struct sm501_devdata *sm;
	int err;

	sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
	if (sm == NULL) {
		dev_err(&dev->dev, "no memory for device data\n");
		err = -ENOMEM;
		goto err1;
	}

	/* set a default set of platform data */
	dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;

	/* set a hopefully unique id for our child platform devices */
	sm->pdev_id = 32 + dev->devfn;

	pci_set_drvdata(dev, sm);

	err = pci_enable_device(dev);
	if (err) {
		dev_err(&dev->dev, "cannot enable device\n");
		goto err2;
	}

	sm->dev = &dev->dev;
	sm->irq = dev->irq;

#ifdef __BIG_ENDIAN
	/* if the system is big-endian, we most probably have a
	 * translation in the IO layer making the PCI bus little endian
	 * so make the framebuffer swapped pixels */

	sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
#endif

	/* check our resources */

	if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
		dev_err(&dev->dev, "region #0 is not memory?\n");
		err = -EINVAL;
		goto err3;
	}

	if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
		dev_err(&dev->dev, "region #1 is not memory?\n");
		err = -EINVAL;
		goto err3;
	}

	/* make our resources ready for sharing */

	sm->io_res = &dev->resource[1];
	sm->mem_res = &dev->resource[0];

	sm->regs_claim = request_mem_region(sm->io_res->start,
					    0x100, "sm501");
	if (sm->regs_claim == NULL) {
		dev_err(&dev->dev, "cannot claim registers\n");
		err= -EBUSY;
		goto err3;
	}

	sm->regs = ioremap(pci_resource_start(dev, 1),
			   pci_resource_len(dev, 1));

	if (sm->regs == NULL) {
		dev_err(&dev->dev, "cannot remap registers\n");
		err = -EIO;
		goto err4;
	}

	sm501_init_dev(sm);
	return 0;

 err4:
	release_resource(sm->regs_claim);
	kfree(sm->regs_claim);
 err3:
	pci_disable_device(dev);
 err2:
	pci_set_drvdata(dev, NULL);
	kfree(sm);
 err1:
	return err;
}

static void sm501_remove_sub(struct sm501_devdata *sm,
			     struct sm501_device *smdev)
{
	list_del(&smdev->list);
	platform_device_unregister(&smdev->pdev);
}

static void sm501_dev_remove(struct sm501_devdata *sm)
{
	struct sm501_device *smdev, *tmp;

	list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
		sm501_remove_sub(sm, smdev);

	device_remove_file(sm->dev, &dev_attr_dbg_regs);
}

static void sm501_pci_remove(struct pci_dev *dev)
{
	struct sm501_devdata *sm = pci_get_drvdata(dev);

	sm501_dev_remove(sm);
	iounmap(sm->regs);

	release_resource(sm->regs_claim);
	kfree(sm->regs_claim);

	pci_set_drvdata(dev, NULL);
	pci_disable_device(dev);
}

static int sm501_plat_remove(struct platform_device *dev)
{
	struct sm501_devdata *sm = platform_get_drvdata(dev);

	sm501_dev_remove(sm);
	iounmap(sm->regs);

	release_resource(sm->regs_claim);
	kfree(sm->regs_claim);

	return 0;
}

static struct pci_device_id sm501_pci_tbl[] = {
	{ 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ 0, },
};

MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);

static struct pci_driver sm501_pci_drv = {
	.name		= "sm501",
	.id_table	= sm501_pci_tbl,
	.probe		= sm501_pci_probe,
	.remove		= sm501_pci_remove,
};

static struct platform_driver sm501_plat_drv = {
	.driver		= {
		.name	= "sm501",
		.owner	= THIS_MODULE,
	},
	.probe		= sm501_plat_probe,
	.remove		= sm501_plat_remove,
	.suspend	= sm501_plat_suspend,
	.resume		= sm501_plat_resume,
};

static int __init sm501_base_init(void)
{
	platform_driver_register(&sm501_plat_drv);
	return pci_register_driver(&sm501_pci_drv);
}

static void __exit sm501_base_exit(void)
{
	platform_driver_unregister(&sm501_plat_drv);
	pci_unregister_driver(&sm501_pci_drv);
}

module_init(sm501_base_init);
module_exit(sm501_base_exit);

MODULE_DESCRIPTION("SM501 Core Driver");
MODULE_AUTHOR("Ben Dooks <[e-mail]>, Vincent Sanders");
MODULE_LICENSE("GPL v2");