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gpio: mcp230xx: Add support for models with SPI interface.
Signed-off-by: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
This commit is contained in:
parent
71e2bc3029
commit
3b639f6438
3 changed files with 144 additions and 5 deletions
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@ -256,6 +256,9 @@ config MCP230XX_GPIO
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- MCP23008
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- MCP23017
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- MCP23018
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- MCP23S08
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- MCP23S17
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- MCP23S18
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config MSCC_SGPIO
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bool "Microsemi Serial GPIO driver"
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@ -23,7 +23,7 @@ obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o
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obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o
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obj-$(CONFIG_IPROC_GPIO) += iproc_gpio.o
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obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
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obj-$(CONFIG_MCP230XX_GPIO) += mcp230xx_gpio.o
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obj-$(CONFIG_$(SPL_TPL_)MCP230XX_GPIO) += mcp230xx_gpio.o
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obj-$(CONFIG_MXC_GPIO) += mxc_gpio.o
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obj-$(CONFIG_MXS_GPIO) += mxs_gpio.o
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obj-$(CONFIG_NPCM_GPIO) += npcm_gpio.o
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@ -11,6 +11,7 @@
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#include <errno.h>
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#include <dm.h>
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#include <i2c.h>
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#include <spi.h>
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#include <asm/gpio.h>
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#include <dm/device_compat.h>
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#include <dt-bindings/gpio/gpio.h>
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@ -20,6 +21,13 @@ enum mcp230xx_type {
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MCP23008,
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MCP23017,
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MCP23018,
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MCP23S08,
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MCP23S17,
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MCP23S18,
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};
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struct mcp230xx_info {
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uint dev_addr;
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};
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#define MCP230XX_IODIR 0x00
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@ -29,29 +37,136 @@ enum mcp230xx_type {
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#define BANKSIZE 8
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#define MCP230XX_ADDR 0x20
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static int mcp230xx_read_spi(struct udevice *dev, uint reg_addr)
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{
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struct mcp230xx_info *info = dev_get_plat(dev);
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uint dev_addr, value = 0;
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int ret;
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/* set R/W bit for reading */
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dev_addr = (info->dev_addr << 1) | 1;
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ret = dm_spi_claim_bus(dev);
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if (ret)
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return ret;
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ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
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if (ret < 0)
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goto fail;
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udelay(1);
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ret = dm_spi_xfer(dev, 8, &dev_addr, NULL, 0);
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if (ret < 0)
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goto fail;
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ret = dm_spi_xfer(dev, 8, ®_addr, NULL, 0);
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if (ret < 0)
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goto fail;
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ret = dm_spi_xfer(dev, 8, NULL, &value, 0);
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fail:
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dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
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dm_spi_release_bus(dev);
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if (ret < 0)
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return ret;
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return value;
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}
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static int mcp230xx_read(struct udevice *dev, uint reg, uint offset)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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int bank = offset / BANKSIZE;
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int mask = 1 << (offset % BANKSIZE);
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int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
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int ret;
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int reg_addr = (reg << shift) | bank;
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int ret = 0;
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switch (dev_get_driver_data(dev)) {
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case MCP23008:
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case MCP23017:
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case MCP23018:
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ret = dm_i2c_reg_read(dev, reg_addr);
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break;
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case MCP23S08:
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case MCP23S17:
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case MCP23S18:
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ret = mcp230xx_read_spi(dev, reg_addr);
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break;
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default:
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return -ENODEV;
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}
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ret = dm_i2c_reg_read(dev, (reg << shift) | bank);
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if (ret < 0)
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return ret;
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return !!(ret & mask);
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}
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static int mcp230xx_clrset_spi(struct udevice *dev, uint reg_addr, uint clr, uint set)
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{
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struct mcp230xx_info *info = dev_get_plat(dev);
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int dev_addr, value;
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int ret;
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/* R/W bit = 0 for writing */
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dev_addr = (info->dev_addr << 1);
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ret = mcp230xx_read_spi(dev, reg_addr);
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if (ret < 0)
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return ret;
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value = ret;
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value &= ~clr;
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value |= set;
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ret = dm_spi_claim_bus(dev);
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if (ret)
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return ret;
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ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
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if (ret < 0)
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goto fail;
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udelay(1);
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ret = dm_spi_xfer(dev, 8, &dev_addr, NULL, 0);
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if (ret < 0)
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goto fail;
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ret = dm_spi_xfer(dev, 8, ®_addr, NULL, 0);
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if (ret < 0)
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goto fail;
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ret = dm_spi_xfer(dev, 8, &value, NULL, 0);
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fail:
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dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
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dm_spi_release_bus(dev);
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return ret;
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}
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static int mcp230xx_write(struct udevice *dev, uint reg, uint offset, bool val)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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int bank = offset / BANKSIZE;
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int mask = 1 << (offset % BANKSIZE);
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int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
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int reg_addr = (reg << shift) | bank;
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return dm_i2c_reg_clrset(dev, (reg << shift) | bank, mask, val ? mask : 0);
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switch (dev_get_driver_data(dev)) {
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case MCP23008:
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case MCP23017:
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case MCP23018:
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return dm_i2c_reg_clrset(dev, reg_addr, mask, val ? mask : 0);
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case MCP23S08:
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case MCP23S17:
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case MCP23S18:
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return mcp230xx_clrset_spi(dev, reg_addr, mask, val ? mask : 0);
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default:
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return -ENODEV;
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}
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}
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static int mcp230xx_get_value(struct udevice *dev, uint offset)
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@ -181,22 +296,37 @@ static const struct dm_gpio_ops mcp230xx_ops = {
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static int mcp230xx_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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char name[32], label[8], *str;
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struct mcp230xx_info *info = dev_get_plat(dev);
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char name[32], label[32], *str;
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int addr, gpio_count, size;
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const u8 *tmp;
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switch (dev_get_driver_data(dev)) {
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case MCP23008:
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case MCP23S08:
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gpio_count = 8;
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break;
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case MCP23017:
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case MCP23018:
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case MCP23S17:
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case MCP23S18:
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gpio_count = 16;
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break;
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default:
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return -ENODEV;
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}
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switch (dev_get_driver_data(dev)) {
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case MCP23S08:
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case MCP23S17:
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case MCP23S18:
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info->dev_addr = dev_read_u32_default(dev, "addr", MCP230XX_ADDR);
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break;
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default:
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info->dev_addr = 0;
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break;
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}
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addr = dev_read_addr(dev);
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tmp = dev_read_prop(dev, "label", &size);
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if (tmp) {
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@ -220,9 +350,14 @@ static int mcp230xx_probe(struct udevice *dev)
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}
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static const struct udevice_id mcp230xx_ids[] = {
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/* i2c interface */
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{ .compatible = "microchip,mcp23008", .data = MCP23008, },
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{ .compatible = "microchip,mcp23017", .data = MCP23017, },
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{ .compatible = "microchip,mcp23018", .data = MCP23018, },
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/* spi interface */
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{ .compatible = "microchip,mcp23s08", .data = MCP23S08, },
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{ .compatible = "microchip,mcp23s17", .data = MCP23S17, },
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{ .compatible = "microchip,mcp23s18", .data = MCP23S18, },
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{ }
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};
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@ -231,5 +366,6 @@ U_BOOT_DRIVER(mcp230xx) = {
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.id = UCLASS_GPIO,
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.ops = &mcp230xx_ops,
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.probe = mcp230xx_probe,
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.plat_auto = sizeof(struct mcp230xx_info),
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.of_match = mcp230xx_ids,
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};
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