dm: x86: Convert Intel ICH6 GPIO driver to use driver model

Convert over this driver, using device tree to pass in the required
information. The peripheral is still probed, just the number of GPIO banks
and their offsets is in the device tree (previously this was a table in
the driver).

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/gpio/intel_ich6_gpio.c

@@ -27,88 +27,46 @@
  */
 
 #include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
 #include <pci.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
 
+#define GPIO_PER_BANK	32
+
 /* Where in config space is the register that points to the GPIO registers? */
 #define PCI_CFG_GPIOBASE 0x48
 
-#define NUM_BANKS 3
-
-/* Within the I/O space, where are the registers to control the GPIOs? */
-static struct {
-	u8 use_sel;
-	u8 io_sel;
-	u8 lvl;
-} gpio_bank[NUM_BANKS] = {
-	{ 0x00, 0x04, 0x0c },		/* Bank 0 */
-	{ 0x30, 0x34, 0x38 },		/* Bank 1 */
-	{ 0x40, 0x44, 0x48 }		/* Bank 2 */
+struct ich6_bank_priv {
+	/* These are I/O addresses */
+	uint32_t use_sel;
+	uint32_t io_sel;
+	uint32_t lvl;
 };
 
-static pci_dev_t dev;			/* handle for 0:1f:0 */
-static u32 gpiobase;			/* offset into I/O space */
-static int found_it_once;		/* valid GPIO device? */
-static u32 lock[NUM_BANKS];		/* "lock" for access to pins */
-
-static int bad_arg(int num, int *bank, int *bitnum)
-{
-	int i = num / 32;
-	int j = num % 32;
-
-	if (num < 0 || i > NUM_BANKS) {
-		debug("%s: bogus gpio num: %d\n", __func__, num);
-		return -1;
-	}
-	*bank = i;
-	*bitnum = j;
-	return 0;
-}
-
-static int mark_gpio(int bank, int bitnum)
-{
-	if (lock[bank] & (1UL << bitnum)) {
-		debug("%s: %d.%d already marked\n", __func__, bank, bitnum);
-		return -1;
-	}
-	lock[bank] |= (1 << bitnum);
-	return 0;
-}
-
-static void clear_gpio(int bank, int bitnum)
-{
-	lock[bank] &= ~(1 << bitnum);
-}
-
-static int notmine(int num, int *bank, int *bitnum)
-{
-	if (bad_arg(num, bank, bitnum))
-		return -1;
-	return !(lock[*bank] & (1UL << *bitnum));
-}
-
-static int gpio_init(void)
+static int gpio_ich6_ofdata_to_platdata(struct udevice *dev)
 {
+	struct ich6_bank_platdata *plat = dev_get_platdata(dev);
+	pci_dev_t pci_dev;			/* handle for 0:1f:0 */
 	u8 tmpbyte;
 	u16 tmpword;
 	u32 tmplong;
-
-	/* Have we already done this? */
-	if (found_it_once)
-		return 0;
+	u32 gpiobase;
+	int offset;
 
 	/* Where should it be? */
-	dev = PCI_BDF(0, 0x1f, 0);
+	pci_dev = PCI_BDF(0, 0x1f, 0);
 
 	/* Is the device present? */
-	pci_read_config_word(dev, PCI_VENDOR_ID, &tmpword);
+	pci_read_config_word(pci_dev, PCI_VENDOR_ID, &tmpword);
 	if (tmpword != PCI_VENDOR_ID_INTEL) {
 		debug("%s: wrong VendorID\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 
-	pci_read_config_word(dev, PCI_DEVICE_ID, &tmpword);
+	pci_read_config_word(pci_dev, PCI_DEVICE_ID, &tmpword);
 	debug("Found %04x:%04x\n", PCI_VENDOR_ID_INTEL, tmpword);
 	/*
 	 * We'd like to validate the Device ID too, but pretty much any
@@ -118,37 +76,37 @@ static int gpio_init(void)
 	 */
 
 	/* I/O should already be enabled (it's a RO bit). */
-	pci_read_config_word(dev, PCI_COMMAND, &tmpword);
+	pci_read_config_word(pci_dev, PCI_COMMAND, &tmpword);
 	if (!(tmpword & PCI_COMMAND_IO)) {
 		debug("%s: device IO not enabled\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 
 	/* Header Type must be normal (bits 6-0 only; see spec.) */
-	pci_read_config_byte(dev, PCI_HEADER_TYPE, &tmpbyte);
+	pci_read_config_byte(pci_dev, PCI_HEADER_TYPE, &tmpbyte);
 	if ((tmpbyte & 0x7f) != PCI_HEADER_TYPE_NORMAL) {
 		debug("%s: invalid Header type\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 
 	/* Base Class must be a bridge device */
-	pci_read_config_byte(dev, PCI_CLASS_CODE, &tmpbyte);
+	pci_read_config_byte(pci_dev, PCI_CLASS_CODE, &tmpbyte);
 	if (tmpbyte != PCI_CLASS_CODE_BRIDGE) {
 		debug("%s: invalid class\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 	/* Sub Class must be ISA */
-	pci_read_config_byte(dev, PCI_CLASS_SUB_CODE, &tmpbyte);
+	pci_read_config_byte(pci_dev, PCI_CLASS_SUB_CODE, &tmpbyte);
 	if (tmpbyte != PCI_CLASS_SUB_CODE_BRIDGE_ISA) {
 		debug("%s: invalid subclass\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 
 	/* Programming Interface must be 0x00 (no others exist) */
-	pci_read_config_byte(dev, PCI_CLASS_PROG, &tmpbyte);
+	pci_read_config_byte(pci_dev, PCI_CLASS_PROG, &tmpbyte);
 	if (tmpbyte != 0x00) {
 		debug("%s: invalid interface type\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 
 	/*
@@ -156,11 +114,11 @@ static int gpio_init(void)
 	 * that it was unused (or undocumented). Check that it looks
 	 * okay: not all ones or zeros, and mapped to I/O space (bit 0).
 	 */
-	pci_read_config_dword(dev, PCI_CFG_GPIOBASE, &tmplong);
+	pci_read_config_dword(pci_dev, PCI_CFG_GPIOBASE, &tmplong);
 	if (tmplong == 0x00000000 || tmplong == 0xffffffff ||
 	    !(tmplong & 0x00000001)) {
 		debug("%s: unexpected GPIOBASE value\n", __func__);
-		return -1;
+		return -ENODEV;
 	}
 
 	/*
@@ -170,105 +128,137 @@ static int gpio_init(void)
 	 * an I/O address, not a memory address, so mask that off.
 	 */
 	gpiobase = tmplong & 0xfffffffe;
+	offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
+	if (offset == -1) {
+		debug("%s: Invalid register offset %d\n", __func__, offset);
+		return -EINVAL;
+	}
+	plat->base_addr = gpiobase + offset;
+	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
+				      "bank-name", NULL);
 
-	/* Finally. These are the droids we're looking for. */
-	found_it_once = 1;
 	return 0;
 }
 
-int gpio_request(unsigned num, const char *label /* UNUSED */)
+int ich6_gpio_probe(struct udevice *dev)
 {
-	u32 tmplong;
-	int i = 0, j = 0;
+	struct ich6_bank_platdata *plat = dev_get_platdata(dev);
+	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
+
+	uc_priv->gpio_count = GPIO_PER_BANK;
+	uc_priv->bank_name = plat->bank_name;
+	bank->use_sel = plat->base_addr;
+	bank->io_sel = plat->base_addr + 4;
+	bank->lvl = plat->base_addr + 8;
 
-	/* Is the hardware ready? */
-	if (gpio_init())
-		return -1;
+	return 0;
+}
 
-	if (bad_arg(num, &i, &j))
-		return -1;
+int ich6_gpio_request(struct udevice *dev, unsigned offset, const char *label)
+{
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
+	u32 tmplong;
 
 	/*
 	 * Make sure that the GPIO pin we want isn't already in use for some
 	 * built-in hardware function. We have to check this for every
 	 * requested pin.
 	 */
-	tmplong = inl(gpiobase + gpio_bank[i].use_sel);
-	if (!(tmplong & (1UL << j))) {
+	tmplong = inl(bank->use_sel);
+	if (!(tmplong & (1UL << offset))) {
 		debug("%s: gpio %d is reserved for internal use\n", __func__,
-		      num);
-		return -1;
+		      offset);
+		return -EPERM;
 	}
 
-	return mark_gpio(i, j);
-}
-
-int gpio_free(unsigned num)
-{
-	int i = 0, j = 0;
-
-	if (notmine(num, &i, &j))
-		return -1;
-
-	clear_gpio(i, j);
 	return 0;
 }
 
-int gpio_direction_input(unsigned num)
+static int ich6_gpio_direction_input(struct udevice *dev, unsigned offset)
 {
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 tmplong;
-	int i = 0, j = 0;
-
-	if (notmine(num, &i, &j))
-		return -1;
 
-	tmplong = inl(gpiobase + gpio_bank[i].io_sel);
-	tmplong |= (1UL << j);
-	outl(gpiobase + gpio_bank[i].io_sel, tmplong);
+	tmplong = inl(bank->io_sel);
+	tmplong |= (1UL << offset);
+	outl(bank->io_sel, tmplong);
 	return 0;
 }
 
-int gpio_direction_output(unsigned num, int value)
+static int ich6_gpio_direction_output(struct udevice *dev, unsigned offset,
+				       int value)
 {
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 tmplong;
-	int i = 0, j = 0;
 
-	if (notmine(num, &i, &j))
-		return -1;
-
-	tmplong = inl(gpiobase + gpio_bank[i].io_sel);
-	tmplong &= ~(1UL << j);
-	outl(gpiobase + gpio_bank[i].io_sel, tmplong);
+	tmplong = inl(bank->io_sel);
+	tmplong &= ~(1UL << offset);
+	outl(bank->io_sel, tmplong);
 	return 0;
 }
 
-int gpio_get_value(unsigned num)
+static int ich6_gpio_get_value(struct udevice *dev, unsigned offset)
+
 {
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 tmplong;
-	int i = 0, j = 0;
 	int r;
 
-	if (notmine(num, &i, &j))
-		return -1;
-
-	tmplong = inl(gpiobase + gpio_bank[i].lvl);
-	r = (tmplong & (1UL << j)) ? 1 : 0;
+	tmplong = inl(bank->lvl);
+	r = (tmplong & (1UL << offset)) ? 1 : 0;
 	return r;
 }
 
-int gpio_set_value(unsigned num, int value)
+static int ich6_gpio_set_value(struct udevice *dev, unsigned offset,
+			       int value)
 {
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
 	u32 tmplong;
-	int i = 0, j = 0;
 
-	if (notmine(num, &i, &j))
-		return -1;
-
-	tmplong = inl(gpiobase + gpio_bank[i].lvl);
+	tmplong = inl(bank->lvl);
 	if (value)
-		tmplong |= (1UL << j);
+		tmplong |= (1UL << offset);
 	else
-		tmplong &= ~(1UL << j);
-	outl(gpiobase + gpio_bank[i].lvl, tmplong);
+		tmplong &= ~(1UL << offset);
+	outl(bank->lvl, tmplong);
 	return 0;
 }
+
+static int ich6_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+	struct ich6_bank_priv *bank = dev_get_priv(dev);
+	u32 mask = 1UL << offset;
+
+	if (!(inl(bank->use_sel) & mask))
+		return GPIOF_FUNC;
+	if (inl(bank->io_sel) & mask)
+		return GPIOF_INPUT;
+	else
+		return GPIOF_OUTPUT;
+}
+
+static const struct dm_gpio_ops gpio_ich6_ops = {
+	.request		= ich6_gpio_request,
+	.direction_input	= ich6_gpio_direction_input,
+	.direction_output	= ich6_gpio_direction_output,
+	.get_value		= ich6_gpio_get_value,
+	.set_value		= ich6_gpio_set_value,
+	.get_function		= ich6_gpio_get_function,
+};
+
+static const struct udevice_id intel_ich6_gpio_ids[] = {
+	{ .compatible = "intel,ich6-gpio" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_ich6) = {
+	.name	= "gpio_ich6",
+	.id	= UCLASS_GPIO,
+	.of_match = intel_ich6_gpio_ids,
+	.ops	= &gpio_ich6_ops,
+	.ofdata_to_platdata	= gpio_ich6_ofdata_to_platdata,
+	.probe	= ich6_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct ich6_bank_priv),
+	.platdata_auto_alloc_size = sizeof(struct ich6_bank_platdata),
+};

include/configs/coreboot.h

@@ -27,6 +27,10 @@
 #define CONFIG_SYS_EARLY_PCI_INIT
 #define CONFIG_DISPLAY_BOARDINFO_LATE
 
+#define CONFIG_DM
+#define CONFIG_CMD_DM
+#define CONFIG_DM_GPIO
+
 #define CONFIG_LMB
 #define CONFIG_OF_LIBFDT