diff options
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/remoteproc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/remoteproc/st_remoteproc.c | 297 |
3 files changed, 307 insertions, 0 deletions
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index 28c711f..72e97d7 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -77,4 +77,13 @@ config DA8XX_REMOTEPROC It's safe to say n here if you're not interested in multimedia offloading. +config ST_REMOTEPROC + tristate "ST remoteproc support" + depends on ARCH_STI + select REMOTEPROC + help + Say y here to support ST's adjunct processors via the remote + processor framework. + This can be either built-in or a loadable module. + endmenu diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile index 81b04d1..279cb2e 100644 --- a/drivers/remoteproc/Makefile +++ b/drivers/remoteproc/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o obj-$(CONFIG_STE_MODEM_RPROC) += ste_modem_rproc.o obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o +obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o diff --git a/drivers/remoteproc/st_remoteproc.c b/drivers/remoteproc/st_remoteproc.c new file mode 100644 index 0000000..6bb04d4 --- /dev/null +++ b/drivers/remoteproc/st_remoteproc.c @@ -0,0 +1,297 @@ +/* + * ST's Remote Processor Control Driver + * + * Copyright (C) 2015 STMicroelectronics - All Rights Reserved + * + * Author: Ludovic Barre <ludovic.barre@st.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_reserved_mem.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/remoteproc.h> +#include <linux/reset.h> + +struct st_rproc_config { + bool sw_reset; + bool pwr_reset; + unsigned long bootaddr_mask; +}; + +struct st_rproc { + struct st_rproc_config *config; + struct reset_control *sw_reset; + struct reset_control *pwr_reset; + struct clk *clk; + u32 clk_rate; + struct regmap *boot_base; + u32 boot_offset; +}; + +static int st_rproc_start(struct rproc *rproc) +{ + struct st_rproc *ddata = rproc->priv; + int err; + + regmap_update_bits(ddata->boot_base, ddata->boot_offset, + ddata->config->bootaddr_mask, rproc->bootaddr); + + err = clk_enable(ddata->clk); + if (err) { + dev_err(&rproc->dev, "Failed to enable clock\n"); + return err; + } + + if (ddata->config->sw_reset) { + err = reset_control_deassert(ddata->sw_reset); + if (err) { + dev_err(&rproc->dev, "Failed to deassert S/W Reset\n"); + goto sw_reset_fail; + } + } + + if (ddata->config->pwr_reset) { + err = reset_control_deassert(ddata->pwr_reset); + if (err) { + dev_err(&rproc->dev, "Failed to deassert Power Reset\n"); + goto pwr_reset_fail; + } + } + + dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr); + + return 0; + + +pwr_reset_fail: + if (ddata->config->pwr_reset) + reset_control_assert(ddata->sw_reset); +sw_reset_fail: + clk_disable(ddata->clk); + + return err; +} + +static int st_rproc_stop(struct rproc *rproc) +{ + struct st_rproc *ddata = rproc->priv; + int sw_err = 0, pwr_err = 0; + + if (ddata->config->sw_reset) { + sw_err = reset_control_assert(ddata->sw_reset); + if (sw_err) + dev_err(&rproc->dev, "Failed to assert S/W Reset\n"); + } + + if (ddata->config->pwr_reset) { + pwr_err = reset_control_assert(ddata->pwr_reset); + if (pwr_err) + dev_err(&rproc->dev, "Failed to assert Power Reset\n"); + } + + clk_disable(ddata->clk); + + return sw_err ?: pwr_err; +} + +static struct rproc_ops st_rproc_ops = { + .start = st_rproc_start, + .stop = st_rproc_stop, +}; + +/* + * Fetch state of the processor: 0 is off, 1 is on. + */ +static int st_rproc_state(struct platform_device *pdev) +{ + struct rproc *rproc = platform_get_drvdata(pdev); + struct st_rproc *ddata = rproc->priv; + int reset_sw = 0, reset_pwr = 0; + + if (ddata->config->sw_reset) + reset_sw = reset_control_status(ddata->sw_reset); + + if (ddata->config->pwr_reset) + reset_pwr = reset_control_status(ddata->pwr_reset); + + if (reset_sw < 0 || reset_pwr < 0) + return -EINVAL; + + return !reset_sw && !reset_pwr; +} + +static const struct st_rproc_config st40_rproc_cfg = { + .sw_reset = true, + .pwr_reset = true, + .bootaddr_mask = GENMASK(28, 1), +}; + +static const struct st_rproc_config st231_rproc_cfg = { + .sw_reset = true, + .pwr_reset = false, + .bootaddr_mask = GENMASK(31, 6), +}; + +static const struct of_device_id st_rproc_match[] = { + { .compatible = "st,st40-rproc", .data = &st40_rproc_cfg }, + { .compatible = "st,st231-rproc", .data = &st231_rproc_cfg }, + {}, +}; +MODULE_DEVICE_TABLE(of, st_rproc_match); + +static int st_rproc_parse_dt(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rproc *rproc = platform_get_drvdata(pdev); + struct st_rproc *ddata = rproc->priv; + struct device_node *np = dev->of_node; + int err; + + if (ddata->config->sw_reset) { + ddata->sw_reset = devm_reset_control_get(dev, "sw_reset"); + if (IS_ERR(ddata->sw_reset)) { + dev_err(dev, "Failed to get S/W Reset\n"); + return PTR_ERR(ddata->sw_reset); + } + } + + if (ddata->config->pwr_reset) { + ddata->pwr_reset = devm_reset_control_get(dev, "pwr_reset"); + if (IS_ERR(ddata->pwr_reset)) { + dev_err(dev, "Failed to get Power Reset\n"); + return PTR_ERR(ddata->pwr_reset); + } + } + + ddata->clk = devm_clk_get(dev, NULL); + if (IS_ERR(ddata->clk)) { + dev_err(dev, "Failed to get clock\n"); + return PTR_ERR(ddata->clk); + } + + err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate); + if (err) { + dev_err(dev, "failed to get clock frequency\n"); + return err; + } + + ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (!ddata->boot_base) { + dev_err(dev, "Boot base not found\n"); + return -EINVAL; + } + + err = of_property_read_u32_index(np, "st,syscfg", 1, + &ddata->boot_offset); + if (err) { + dev_err(dev, "Boot offset not found\n"); + return -EINVAL; + } + + err = of_reserved_mem_device_init(dev); + if (err) { + dev_err(dev, "Failed to obtain shared memory\n"); + return err; + } + + err = clk_prepare(ddata->clk); + if (err) + dev_err(dev, "failed to get clock\n"); + + return err; +} + +static int st_rproc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct of_device_id *match; + struct st_rproc *ddata; + struct device_node *np = dev->of_node; + struct rproc *rproc; + int enabled; + int ret; + + match = of_match_device(st_rproc_match, dev); + if (!match || !match->data) { + dev_err(dev, "No device match found\n"); + return -ENODEV; + } + + rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata)); + if (!rproc) + return -ENOMEM; + + rproc->has_iommu = false; + ddata = rproc->priv; + ddata->config = (struct st_rproc_config *)match->data; + + platform_set_drvdata(pdev, rproc); + + ret = st_rproc_parse_dt(pdev); + if (ret) + goto free_rproc; + + enabled = st_rproc_state(pdev); + if (enabled < 0) + goto free_rproc; + + if (enabled) { + atomic_inc(&rproc->power); + rproc->state = RPROC_RUNNING; + } else { + clk_set_rate(ddata->clk, ddata->clk_rate); + } + + ret = rproc_add(rproc); + if (ret) + goto free_rproc; + + return 0; + +free_rproc: + rproc_put(rproc); + return ret; +} + +static int st_rproc_remove(struct platform_device *pdev) +{ + struct rproc *rproc = platform_get_drvdata(pdev); + struct st_rproc *ddata = rproc->priv; + + rproc_del(rproc); + + clk_disable_unprepare(ddata->clk); + + of_reserved_mem_device_release(&pdev->dev); + + rproc_put(rproc); + + return 0; +} + +static struct platform_driver st_rproc_driver = { + .probe = st_rproc_probe, + .remove = st_rproc_remove, + .driver = { + .name = "st-rproc", + .of_match_table = of_match_ptr(st_rproc_match), + }, +}; +module_platform_driver(st_rproc_driver); + +MODULE_DESCRIPTION("ST Remote Processor Control Driver"); +MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>"); +MODULE_LICENSE("GPL v2"); |
