gpio: mcp230xx: Add support for models with SPI interface.

Signed-off-by: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
This commit is contained in:
Piotr Wojtaszczyk 2024-03-13 12:54:56 +01:00 committed by Tom Rini
parent 71e2bc3029
commit 3b639f6438
3 changed files with 144 additions and 5 deletions

View file

@ -256,6 +256,9 @@ config MCP230XX_GPIO
- MCP23008
- MCP23017
- MCP23018
- MCP23S08
- MCP23S17
- MCP23S18
config MSCC_SGPIO
bool "Microsemi Serial GPIO driver"

View file

@ -23,7 +23,7 @@ obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o
obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o
obj-$(CONFIG_IPROC_GPIO) += iproc_gpio.o
obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
obj-$(CONFIG_MCP230XX_GPIO) += mcp230xx_gpio.o
obj-$(CONFIG_$(SPL_TPL_)MCP230XX_GPIO) += mcp230xx_gpio.o
obj-$(CONFIG_MXC_GPIO) += mxc_gpio.o
obj-$(CONFIG_MXS_GPIO) += mxs_gpio.o
obj-$(CONFIG_NPCM_GPIO) += npcm_gpio.o

View file

@ -11,6 +11,7 @@
#include <errno.h>
#include <dm.h>
#include <i2c.h>
#include <spi.h>
#include <asm/gpio.h>
#include <dm/device_compat.h>
#include <dt-bindings/gpio/gpio.h>
@ -20,6 +21,13 @@ enum mcp230xx_type {
MCP23008,
MCP23017,
MCP23018,
MCP23S08,
MCP23S17,
MCP23S18,
};
struct mcp230xx_info {
uint dev_addr;
};
#define MCP230XX_IODIR 0x00
@ -29,29 +37,136 @@ enum mcp230xx_type {
#define BANKSIZE 8
#define MCP230XX_ADDR 0x20
static int mcp230xx_read_spi(struct udevice *dev, uint reg_addr)
{
struct mcp230xx_info *info = dev_get_plat(dev);
uint dev_addr, value = 0;
int ret;
/* set R/W bit for reading */
dev_addr = (info->dev_addr << 1) | 1;
ret = dm_spi_claim_bus(dev);
if (ret)
return ret;
ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
if (ret < 0)
goto fail;
udelay(1);
ret = dm_spi_xfer(dev, 8, &dev_addr, NULL, 0);
if (ret < 0)
goto fail;
ret = dm_spi_xfer(dev, 8, &reg_addr, NULL, 0);
if (ret < 0)
goto fail;
ret = dm_spi_xfer(dev, 8, NULL, &value, 0);
fail:
dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
dm_spi_release_bus(dev);
if (ret < 0)
return ret;
return value;
}
static int mcp230xx_read(struct udevice *dev, uint reg, uint offset)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int bank = offset / BANKSIZE;
int mask = 1 << (offset % BANKSIZE);
int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
int ret;
int reg_addr = (reg << shift) | bank;
int ret = 0;
switch (dev_get_driver_data(dev)) {
case MCP23008:
case MCP23017:
case MCP23018:
ret = dm_i2c_reg_read(dev, reg_addr);
break;
case MCP23S08:
case MCP23S17:
case MCP23S18:
ret = mcp230xx_read_spi(dev, reg_addr);
break;
default:
return -ENODEV;
}
ret = dm_i2c_reg_read(dev, (reg << shift) | bank);
if (ret < 0)
return ret;
return !!(ret & mask);
}
static int mcp230xx_clrset_spi(struct udevice *dev, uint reg_addr, uint clr, uint set)
{
struct mcp230xx_info *info = dev_get_plat(dev);
int dev_addr, value;
int ret;
/* R/W bit = 0 for writing */
dev_addr = (info->dev_addr << 1);
ret = mcp230xx_read_spi(dev, reg_addr);
if (ret < 0)
return ret;
value = ret;
value &= ~clr;
value |= set;
ret = dm_spi_claim_bus(dev);
if (ret)
return ret;
ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN);
if (ret < 0)
goto fail;
udelay(1);
ret = dm_spi_xfer(dev, 8, &dev_addr, NULL, 0);
if (ret < 0)
goto fail;
ret = dm_spi_xfer(dev, 8, &reg_addr, NULL, 0);
if (ret < 0)
goto fail;
ret = dm_spi_xfer(dev, 8, &value, NULL, 0);
fail:
dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
dm_spi_release_bus(dev);
return ret;
}
static int mcp230xx_write(struct udevice *dev, uint reg, uint offset, bool val)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int bank = offset / BANKSIZE;
int mask = 1 << (offset % BANKSIZE);
int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
int reg_addr = (reg << shift) | bank;
return dm_i2c_reg_clrset(dev, (reg << shift) | bank, mask, val ? mask : 0);
switch (dev_get_driver_data(dev)) {
case MCP23008:
case MCP23017:
case MCP23018:
return dm_i2c_reg_clrset(dev, reg_addr, mask, val ? mask : 0);
case MCP23S08:
case MCP23S17:
case MCP23S18:
return mcp230xx_clrset_spi(dev, reg_addr, mask, val ? mask : 0);
default:
return -ENODEV;
}
}
static int mcp230xx_get_value(struct udevice *dev, uint offset)
@ -181,22 +296,37 @@ static const struct dm_gpio_ops mcp230xx_ops = {
static int mcp230xx_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
char name[32], label[8], *str;
struct mcp230xx_info *info = dev_get_plat(dev);
char name[32], label[32], *str;
int addr, gpio_count, size;
const u8 *tmp;
switch (dev_get_driver_data(dev)) {
case MCP23008:
case MCP23S08:
gpio_count = 8;
break;
case MCP23017:
case MCP23018:
case MCP23S17:
case MCP23S18:
gpio_count = 16;
break;
default:
return -ENODEV;
}
switch (dev_get_driver_data(dev)) {
case MCP23S08:
case MCP23S17:
case MCP23S18:
info->dev_addr = dev_read_u32_default(dev, "addr", MCP230XX_ADDR);
break;
default:
info->dev_addr = 0;
break;
}
addr = dev_read_addr(dev);
tmp = dev_read_prop(dev, "label", &size);
if (tmp) {
@ -220,9 +350,14 @@ static int mcp230xx_probe(struct udevice *dev)
}
static const struct udevice_id mcp230xx_ids[] = {
/* i2c interface */
{ .compatible = "microchip,mcp23008", .data = MCP23008, },
{ .compatible = "microchip,mcp23017", .data = MCP23017, },
{ .compatible = "microchip,mcp23018", .data = MCP23018, },
/* spi interface */
{ .compatible = "microchip,mcp23s08", .data = MCP23S08, },
{ .compatible = "microchip,mcp23s17", .data = MCP23S17, },
{ .compatible = "microchip,mcp23s18", .data = MCP23S18, },
{ }
};
@ -231,5 +366,6 @@ U_BOOT_DRIVER(mcp230xx) = {
.id = UCLASS_GPIO,
.ops = &mcp230xx_ops,
.probe = mcp230xx_probe,
.plat_auto = sizeof(struct mcp230xx_info),
.of_match = mcp230xx_ids,
};