[PATCH v2 3/4] remoteproc: Supply controller driver for ST's Remote Processors
Lee Jones
lee.jones at linaro.org
Fri Aug 28 03:31:50 PDT 2015
Signed-off-by: Ludovic Barre <ludovic.barre at st.com>
Signed-off-by: Lee Jones <lee.jones at linaro.org>
---
drivers/remoteproc/Kconfig | 9 ++
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/st_remoteproc.c | 301 +++++++++++++++++++++++++++++++++++++
3 files changed, 311 insertions(+)
create mode 100644 drivers/remoteproc/st_remoteproc.c
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..96b784d
--- /dev/null
+++ b/drivers/remoteproc/st_remoteproc.c
@@ -0,0 +1,301 @@
+/*
+ * ST's Remote Processor Control Driver
+ *
+ * Copyright (C) 2015 STMicroelectronics - All Rights Reserved
+ *
+ * Author: Ludovic Barre <ludovic.barre at st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ */
+
+#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/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;
+ u32 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_stop(struct rproc *rproc)
+{
+ struct st_rproc *st_rproc = rproc->priv;
+ int ret, err = 0;
+
+ if (st_rproc->config->sw_reset) {
+ ret = reset_control_assert(st_rproc->sw_reset);
+ if (ret)
+ dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
+ }
+
+ if (st_rproc->config->pwr_reset) {
+ err = reset_control_assert(st_rproc->pwr_reset);
+ if (err)
+ dev_err(&rproc->dev, "Failed to assert Power Reset\n");
+ }
+
+ clk_disable(st_rproc->clk);
+
+ return ret ?: err;
+}
+
+static int st_rproc_start(struct rproc *rproc)
+{
+ struct st_rproc *st_rproc = rproc->priv;
+ int err;
+
+ regmap_update_bits(st_rproc->boot_base, st_rproc->boot_offset,
+ st_rproc->config->bootaddr_mask, rproc->bootaddr);
+
+ err = clk_enable(st_rproc->clk);
+ if (err) {
+ dev_err(&rproc->dev, "Failed to enable clock\n");
+ return err;
+ }
+
+ if (st_rproc->config->sw_reset) {
+ err = reset_control_deassert(st_rproc->sw_reset);
+ if (err) {
+ dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
+ return err;
+ }
+ }
+
+ if (st_rproc->config->pwr_reset) {
+ err = reset_control_deassert(st_rproc->pwr_reset);
+ if (err) {
+ dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
+ return err;
+ }
+ }
+
+ dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr);
+
+ return 0;
+}
+
+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 st_rproc *st_rproc)
+{
+ int reset_sw, reset_pwr;
+
+ reset_sw = st_rproc->config->sw_reset ?
+ reset_control_status(st_rproc->sw_reset) : 0;
+
+ reset_pwr = st_rproc->config->pwr_reset ?
+ reset_control_status(st_rproc->pwr_reset) : 0;
+
+ 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 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 *st_rproc = rproc->priv;
+ struct device_node *np = dev->of_node;
+ struct resource *mem;
+ int err;
+
+ if (st_rproc->config->sw_reset) {
+ st_rproc->sw_reset = devm_reset_control_get(dev, "sw_reset");
+ if (IS_ERR(st_rproc->sw_reset)) {
+ dev_err(dev, "Failed to get S/W Reset\n");
+ return PTR_ERR(st_rproc->sw_reset);
+ }
+ }
+
+ if (st_rproc->config->pwr_reset) {
+ st_rproc->pwr_reset = devm_reset_control_get(dev, "pwr_reset");
+ if (IS_ERR(st_rproc->pwr_reset)) {
+ dev_err(dev, "Failed to get Power Reset\n");
+ return PTR_ERR(st_rproc->pwr_reset);
+ }
+ }
+
+ st_rproc->clk = devm_clk_get(dev, "rproc_clk");
+ if (IS_ERR(st_rproc->clk)) {
+ dev_err(dev, "Failed to get clock\n");
+ return PTR_ERR(st_rproc->clk);
+ }
+
+ err = of_property_read_u32(np, "clock-frequency", &st_rproc->clk_rate);
+ if (err) {
+ dev_err(dev, "failed to get clock frequency\n");
+ return err;
+ }
+
+
+ st_rproc->boot_base =
+ syscon_regmap_lookup_by_phandle(np, "st,syscfg-boot");
+ if (!st_rproc->boot_base) {
+ dev_err(dev, "Boot base not found\n");
+ return -EINVAL;
+ }
+
+ err = of_property_read_u32_index(np, "st,syscfg-boot", 1,
+ &st_rproc->boot_offset);
+ if (err) {
+ dev_err(dev, "Boot offset not found\n");
+ return -EINVAL;
+ }
+
+ mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "carveout");
+ if (!mem) {
+ dev_err(dev, "no rproc memory definition\n");
+ return -ENXIO;
+ }
+
+ if (!devm_request_mem_region(dev, mem->start,
+ resource_size(mem), pdev->name)) {
+ dev_err(dev, "failed to get memory region resource\n");
+ return -EBUSY;
+ }
+ err = dmam_declare_coherent_memory(dev, mem->start, mem->start,
+ resource_size(mem),
+ DMA_MEMORY_MAP |
+ DMA_MEMORY_EXCLUSIVE);
+ if (err < 0) {
+ dev_err(dev, "cannot declare coherent memory: %d\n", err);
+ return -ENXIO;
+ }
+
+ err = clk_prepare(st_rproc->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 *st_rproc;
+ 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(*st_rproc));
+ if (!rproc)
+ return -ENOMEM;
+
+ st_rproc = rproc->priv;
+ st_rproc->config = (struct st_rproc_config *)match->data;
+ platform_set_drvdata(pdev, rproc);
+
+ ret = st_rproc_parse_dt(pdev);
+ if (ret)
+ goto free_rproc;
+
+ ret = st_rproc_state(st_rproc);
+ if (ret < 0)
+ goto free_rproc;
+ enabled = ret;
+
+ if (enabled) {
+ atomic_inc(&rproc->power);
+ rproc->state = RPROC_RUNNING;
+ } else {
+ clk_set_rate(st_rproc->clk, st_rproc->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 *st_rproc = rproc->priv;
+
+ rproc_del(rproc);
+
+ clk_disable_unprepare(st_rproc->clk);
+
+ 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 at st.com>");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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