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author | Gabriel Huau <contact@huau-gabriel.fr> | 2015-05-25 22:27:37 -0700 |
---|---|---|
committer | Simon Glass <sjg@chromium.org> | 2015-06-04 03:32:08 -0600 |
commit | 5318f18d2c002f505054b90bb95ba7c53532eedf (patch) | |
tree | c9e25f8c9fc57dbeba19b617f421b6f1ba7ca8d1 /drivers | |
parent | afbbd413a3ef8a45155fcd083814ba645b09fcc7 (diff) | |
download | u-boot-imx-5318f18d2c002f505054b90bb95ba7c53532eedf.zip u-boot-imx-5318f18d2c002f505054b90bb95ba7c53532eedf.tar.gz u-boot-imx-5318f18d2c002f505054b90bb95ba7c53532eedf.tar.bz2 |
x86: gpio: add pinctrl support from the device tree
Every pin can be configured now from the device tree. A dt-bindings
has been added to describe the different property available.
Change-Id: I1668886062655f83700d0e7bbbe3ad09b19ee975
Signed-off-by: Gabriel Huau <contact@huau-gabriel.fr>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/gpio/intel_ich6_gpio.c | 257 |
1 files changed, 229 insertions, 28 deletions
diff --git a/drivers/gpio/intel_ich6_gpio.c b/drivers/gpio/intel_ich6_gpio.c index 7e679a0..8a108f3 100644 --- a/drivers/gpio/intel_ich6_gpio.c +++ b/drivers/gpio/intel_ich6_gpio.c @@ -44,21 +44,28 @@ struct ich6_bank_priv { uint16_t lvl; }; +#define GPIO_USESEL_OFFSET(x) (x) +#define GPIO_IOSEL_OFFSET(x) (x + 4) +#define GPIO_LVL_OFFSET(x) (x + 8) + +#define IOPAD_MODE_MASK 0x7 +#define IOPAD_PULL_ASSIGN_SHIFT 7 +#define IOPAD_PULL_ASSIGN_MASK (0x3 << IOPAD_PULL_ASSIGN_SHIFT) +#define IOPAD_PULL_STRENGTH_SHIFT 9 +#define IOPAD_PULL_STRENGTH_MASK (0x3 << IOPAD_PULL_STRENGTH_SHIFT) + /* TODO: Move this to device tree, or platform data */ void ich_gpio_set_gpio_map(const struct pch_gpio_map *map) { gd->arch.gpio_map = map; } -static int gpio_ich6_ofdata_to_platdata(struct udevice *dev) +static int gpio_ich6_get_base(unsigned long base) { - 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; - u16 gpiobase; - int offset; /* Where should it be? */ pci_dev = PCI_BDF(0, 0x1f, 0); @@ -123,9 +130,9 @@ static int gpio_ich6_ofdata_to_platdata(struct udevice *dev) * while on the Ivybridge the bit0 is used to indicate it is an * I/O space. */ - tmplong = x86_pci_read_config32(pci_dev, PCI_CFG_GPIOBASE); + tmplong = x86_pci_read_config32(pci_dev, base); if (tmplong == 0x00000000 || tmplong == 0xffffffff) { - debug("%s: unexpected GPIOBASE value\n", __func__); + debug("%s: unexpected BASE value\n", __func__); return -ENODEV; } @@ -135,7 +142,215 @@ static int gpio_ich6_ofdata_to_platdata(struct udevice *dev) * at the offset that we just read. Bit 0 indicates that it's * an I/O address, not a memory address, so mask that off. */ - gpiobase = tmplong & 0xfffe; + return tmplong & 0xfffc; +} + +static int _ich6_gpio_set_value(uint16_t base, unsigned offset, int value) +{ + u32 val; + + val = inl(base); + if (value) + val |= (1UL << offset); + else + val &= ~(1UL << offset); + outl(val, base); + + return 0; +} + +static int _ich6_gpio_set_function(uint16_t base, unsigned offset, int func) +{ + u32 val; + + if (func) { + val = inl(base); + val |= (1UL << offset); + outl(val, base); + } else { + val = inl(base); + val &= ~(1UL << offset); + outl(val, base); + } + + return 0; +} + +static int _ich6_gpio_set_direction(uint16_t base, unsigned offset, int dir) +{ + u32 val; + + if (!dir) { + val = inl(base); + val |= (1UL << offset); + outl(val, base); + } else { + val = inl(base); + val &= ~(1UL << offset); + outl(val, base); + } + + return 0; +} + +static int _gpio_ich6_pinctrl_cfg_pin(s32 gpiobase, s32 iobase, int pin_node) +{ + u32 gpio_offset[2]; + int pad_offset; + int val; + int ret; + const void *prop; + + /* + * GPIO node is not mandatory, so we only do the + * pinmuxing if the node exist. + */ + ret = fdtdec_get_int_array(gd->fdt_blob, pin_node, "gpio-offset", + gpio_offset, 2); + if (!ret) { + /* Do we want to force the GPIO mode? */ + prop = fdt_getprop(gd->fdt_blob, pin_node, "mode-gpio", + NULL); + if (prop) + _ich6_gpio_set_function(GPIO_USESEL_OFFSET + (gpiobase) + + gpio_offset[0], + gpio_offset[1], 1); + + val = + fdtdec_get_int(gd->fdt_blob, pin_node, "direction", -1); + if (val != -1) + _ich6_gpio_set_direction(GPIO_IOSEL_OFFSET + (gpiobase) + + gpio_offset[0], + gpio_offset[1], val); + + val = + fdtdec_get_int(gd->fdt_blob, pin_node, "output-value", -1); + if (val != -1) + _ich6_gpio_set_value(GPIO_LVL_OFFSET(gpiobase) + + gpio_offset[0], + gpio_offset[1], val); + } + + /* if iobase is present, let's configure the pad */ + if (iobase != -1) { + int iobase_addr; + + /* + * The offset for the same pin for the IOBASE and GPIOBASE are + * different, so instead of maintaining a lookup table, + * the device tree should provide directly the correct + * value for both mapping. + */ + pad_offset = + fdtdec_get_int(gd->fdt_blob, pin_node, "pad-offset", -1); + if (pad_offset == -1) { + debug("%s: Invalid register io offset %d\n", + __func__, pad_offset); + return -EINVAL; + } + + /* compute the absolute pad address */ + iobase_addr = iobase + pad_offset; + + /* + * Do we need to set a specific function mode? + * If someone put also 'mode-gpio', this option will + * be just ignored by the controller + */ + val = fdtdec_get_int(gd->fdt_blob, pin_node, "mode-func", -1); + if (val != -1) + clrsetbits_le32(iobase_addr, IOPAD_MODE_MASK, val); + + /* Configure the pull-up/down if needed */ + val = fdtdec_get_int(gd->fdt_blob, pin_node, "pull-assign", -1); + if (val != -1) + clrsetbits_le32(iobase_addr, + IOPAD_PULL_ASSIGN_MASK, + val << IOPAD_PULL_ASSIGN_SHIFT); + + val = + fdtdec_get_int(gd->fdt_blob, pin_node, "pull-strength", -1); + if (val != -1) + clrsetbits_le32(iobase_addr, + IOPAD_PULL_STRENGTH_MASK, + val << IOPAD_PULL_STRENGTH_SHIFT); + + debug("%s: pad cfg [0x%x]: %08x\n", __func__, pad_offset, + readl(iobase_addr)); + } + + return 0; +} + +int gpio_ich6_pinctrl_init(void) +{ + int pin_node; + int node; + int ret; + int gpiobase; + int iobase_offset; + int iobase = -1; + + /* + * Get the memory/io base address to configure every pins. + * IOBASE is used to configure the mode/pads + * GPIOBASE is used to configure the direction and default value + */ + gpiobase = gpio_ich6_get_base(PCI_CFG_GPIOBASE); + if (gpiobase < 0) { + debug("%s: invalid GPIOBASE address (%08x)\n", __func__, + gpiobase); + return -EINVAL; + } + + /* This is not an error to not have a pinctrl node */ + node = + fdtdec_next_compatible(gd->fdt_blob, 0, COMPAT_INTEL_X86_PINCTRL); + if (node <= 0) { + debug("%s: no pinctrl node\n", __func__); + return 0; + } + + /* + * Get the IOBASE, this is not mandatory as this is not + * supported by all the CPU + */ + iobase_offset = fdtdec_get_int(gd->fdt_blob, node, "io-base", -1); + if (iobase_offset == -1) { + debug("%s: io-base offset not present\n", __func__); + } else { + iobase = gpio_ich6_get_base(iobase_offset); + if (iobase < 0) { + debug("%s: invalid IOBASE address (%08x)\n", __func__, + iobase); + return -EINVAL; + } + } + + for (pin_node = fdt_first_subnode(gd->fdt_blob, node); + pin_node > 0; + pin_node = fdt_next_subnode(gd->fdt_blob, pin_node)) { + /* Configure the pin */ + ret = _gpio_ich6_pinctrl_cfg_pin(gpiobase, iobase, pin_node); + if (ret != 0) { + debug("%s: invalid configuration for the pin %d\n", + __func__, pin_node); + return ret; + } + } + + return 0; +} + +static int gpio_ich6_ofdata_to_platdata(struct udevice *dev) +{ + struct ich6_bank_platdata *plat = dev_get_platdata(dev); + u16 gpiobase; + int offset; + + gpiobase = gpio_ich6_get_base(PCI_CFG_GPIOBASE); offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1); if (offset == -1) { debug("%s: Invalid register offset %d\n", __func__, offset); @@ -192,30 +407,24 @@ static int ich6_gpio_request(struct udevice *dev, unsigned offset, static int ich6_gpio_direction_input(struct udevice *dev, unsigned offset) { struct ich6_bank_priv *bank = dev_get_priv(dev); - u32 tmplong; - tmplong = inl(bank->io_sel); - tmplong |= (1UL << offset); - outl(bank->io_sel, tmplong); - return 0; + return _ich6_gpio_set_direction(inl(bank->io_sel), offset, 0); } static int ich6_gpio_direction_output(struct udevice *dev, unsigned offset, int value) { + int ret; struct ich6_bank_priv *bank = dev_get_priv(dev); - u32 tmplong; - gpio_set_value(offset, value); + ret = _ich6_gpio_set_direction(inl(bank->io_sel), offset, 1); + if (ret) + return ret; - tmplong = inl(bank->io_sel); - tmplong &= ~(1UL << offset); - outl(bank->io_sel, tmplong); - return 0; + return _ich6_gpio_set_value(bank->lvl, offset, value); } static int ich6_gpio_get_value(struct udevice *dev, unsigned offset) - { struct ich6_bank_priv *bank = dev_get_priv(dev); u32 tmplong; @@ -230,15 +439,7 @@ static int ich6_gpio_set_value(struct udevice *dev, unsigned offset, int value) { struct ich6_bank_priv *bank = dev_get_priv(dev); - u32 tmplong; - - tmplong = inl(bank->lvl); - if (value) - tmplong |= (1UL << offset); - else - tmplong &= ~(1UL << offset); - outl(bank->lvl, tmplong); - return 0; + return _ich6_gpio_set_value(bank->lvl, offset, value); } static int ich6_gpio_get_function(struct udevice *dev, unsigned offset) |