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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/mfd/ocelot-core.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mfd/ocelot-core.c')
-rw-r--r-- | drivers/mfd/ocelot-core.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/mfd/ocelot-core.c b/drivers/mfd/ocelot-core.c new file mode 100644 index 000000000..1816d52c6 --- /dev/null +++ b/drivers/mfd/ocelot-core.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* + * Core driver for the Ocelot chip family. + * + * The VSC7511, 7512, 7513, and 7514 can be controlled internally via an + * on-chip MIPS processor, or externally via SPI, I2C, PCIe. This core driver is + * intended to be the bus-agnostic glue between, for example, the SPI bus and + * the child devices. + * + * Copyright 2021-2022 Innovative Advantage Inc. + * + * Author: Colin Foster <colin.foster@in-advantage.com> + */ + +#include <linux/bits.h> +#include <linux/device.h> +#include <linux/export.h> +#include <linux/iopoll.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/ocelot.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/types.h> + +#include <soc/mscc/ocelot.h> + +#include "ocelot.h" + +#define REG_GCB_SOFT_RST 0x0008 + +#define BIT_SOFT_CHIP_RST BIT(0) + +#define VSC7512_MIIM0_RES_START 0x7107009c +#define VSC7512_MIIM1_RES_START 0x710700c0 +#define VSC7512_MIIM_RES_SIZE 0x024 + +#define VSC7512_PHY_RES_START 0x710700f0 +#define VSC7512_PHY_RES_SIZE 0x004 + +#define VSC7512_GPIO_RES_START 0x71070034 +#define VSC7512_GPIO_RES_SIZE 0x06c + +#define VSC7512_SIO_CTRL_RES_START 0x710700f8 +#define VSC7512_SIO_CTRL_RES_SIZE 0x100 + +#define VSC7512_GCB_RST_SLEEP_US 100 +#define VSC7512_GCB_RST_TIMEOUT_US 100000 + +static int ocelot_gcb_chip_rst_status(struct ocelot_ddata *ddata) +{ + int val, err; + + err = regmap_read(ddata->gcb_regmap, REG_GCB_SOFT_RST, &val); + if (err) + return err; + + return val; +} + +int ocelot_chip_reset(struct device *dev) +{ + struct ocelot_ddata *ddata = dev_get_drvdata(dev); + int ret, val; + + /* + * Reset the entire chip here to put it into a completely known state. + * Other drivers may want to reset their own subsystems. The register + * self-clears, so one write is all that is needed and wait for it to + * clear. + */ + ret = regmap_write(ddata->gcb_regmap, REG_GCB_SOFT_RST, BIT_SOFT_CHIP_RST); + if (ret) + return ret; + + return readx_poll_timeout(ocelot_gcb_chip_rst_status, ddata, val, !val, + VSC7512_GCB_RST_SLEEP_US, VSC7512_GCB_RST_TIMEOUT_US); +} +EXPORT_SYMBOL_NS(ocelot_chip_reset, MFD_OCELOT); + +static const struct resource vsc7512_miim0_resources[] = { + DEFINE_RES_REG_NAMED(VSC7512_MIIM0_RES_START, VSC7512_MIIM_RES_SIZE, "gcb_miim0"), + DEFINE_RES_REG_NAMED(VSC7512_PHY_RES_START, VSC7512_PHY_RES_SIZE, "gcb_phy"), +}; + +static const struct resource vsc7512_miim1_resources[] = { + DEFINE_RES_REG_NAMED(VSC7512_MIIM1_RES_START, VSC7512_MIIM_RES_SIZE, "gcb_miim1"), +}; + +static const struct resource vsc7512_pinctrl_resources[] = { + DEFINE_RES_REG_NAMED(VSC7512_GPIO_RES_START, VSC7512_GPIO_RES_SIZE, "gcb_gpio"), +}; + +static const struct resource vsc7512_sgpio_resources[] = { + DEFINE_RES_REG_NAMED(VSC7512_SIO_CTRL_RES_START, VSC7512_SIO_CTRL_RES_SIZE, "gcb_sio"), +}; + +static const struct mfd_cell vsc7512_devs[] = { + { + .name = "ocelot-pinctrl", + .of_compatible = "mscc,ocelot-pinctrl", + .num_resources = ARRAY_SIZE(vsc7512_pinctrl_resources), + .resources = vsc7512_pinctrl_resources, + }, { + .name = "ocelot-sgpio", + .of_compatible = "mscc,ocelot-sgpio", + .num_resources = ARRAY_SIZE(vsc7512_sgpio_resources), + .resources = vsc7512_sgpio_resources, + }, { + .name = "ocelot-miim0", + .of_compatible = "mscc,ocelot-miim", + .of_reg = VSC7512_MIIM0_RES_START, + .use_of_reg = true, + .num_resources = ARRAY_SIZE(vsc7512_miim0_resources), + .resources = vsc7512_miim0_resources, + }, { + .name = "ocelot-miim1", + .of_compatible = "mscc,ocelot-miim", + .of_reg = VSC7512_MIIM1_RES_START, + .use_of_reg = true, + .num_resources = ARRAY_SIZE(vsc7512_miim1_resources), + .resources = vsc7512_miim1_resources, + }, +}; + +static void ocelot_core_try_add_regmap(struct device *dev, + const struct resource *res) +{ + if (dev_get_regmap(dev, res->name)) + return; + + ocelot_spi_init_regmap(dev, res); +} + +static void ocelot_core_try_add_regmaps(struct device *dev, + const struct mfd_cell *cell) +{ + int i; + + for (i = 0; i < cell->num_resources; i++) + ocelot_core_try_add_regmap(dev, &cell->resources[i]); +} + +int ocelot_core_init(struct device *dev) +{ + int i, ndevs; + + ndevs = ARRAY_SIZE(vsc7512_devs); + + for (i = 0; i < ndevs; i++) + ocelot_core_try_add_regmaps(dev, &vsc7512_devs[i]); + + return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, vsc7512_devs, ndevs, NULL, 0, NULL); +} +EXPORT_SYMBOL_NS(ocelot_core_init, MFD_OCELOT); + +MODULE_DESCRIPTION("Externally Controlled Ocelot Chip Driver"); +MODULE_AUTHOR("Colin Foster <colin.foster@in-advantage.com>"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(MFD_OCELOT_SPI); |