linuxdebug/drivers/soc/ti/pruss.c

359 lines
8.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* PRU-ICSS platform driver for various TI SoCs
*
* Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
* Author(s):
* Suman Anna <s-anna@ti.com>
* Andrew F. Davis <afd@ti.com>
*/
#include <linux/clk-provider.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/pruss_driver.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/**
* struct pruss_private_data - PRUSS driver private data
* @has_no_sharedram: flag to indicate the absence of PRUSS Shared Data RAM
* @has_core_mux_clock: flag to indicate the presence of PRUSS core clock
*/
struct pruss_private_data {
bool has_no_sharedram;
bool has_core_mux_clock;
};
static void pruss_of_free_clk_provider(void *data)
{
struct device_node *clk_mux_np = data;
of_clk_del_provider(clk_mux_np);
of_node_put(clk_mux_np);
}
static int pruss_clk_mux_setup(struct pruss *pruss, struct clk *clk_mux,
char *mux_name, struct device_node *clks_np)
{
struct device_node *clk_mux_np;
struct device *dev = pruss->dev;
char *clk_mux_name;
unsigned int num_parents;
const char **parent_names;
void __iomem *reg;
u32 reg_offset;
int ret;
clk_mux_np = of_get_child_by_name(clks_np, mux_name);
if (!clk_mux_np) {
dev_err(dev, "%pOF is missing its '%s' node\n", clks_np,
mux_name);
return -ENODEV;
}
num_parents = of_clk_get_parent_count(clk_mux_np);
if (num_parents < 1) {
dev_err(dev, "mux-clock %pOF must have parents\n", clk_mux_np);
ret = -EINVAL;
goto put_clk_mux_np;
}
parent_names = devm_kcalloc(dev, sizeof(*parent_names), num_parents,
GFP_KERNEL);
if (!parent_names) {
ret = -ENOMEM;
goto put_clk_mux_np;
}
of_clk_parent_fill(clk_mux_np, parent_names, num_parents);
clk_mux_name = devm_kasprintf(dev, GFP_KERNEL, "%s.%pOFn",
dev_name(dev), clk_mux_np);
if (!clk_mux_name) {
ret = -ENOMEM;
goto put_clk_mux_np;
}
ret = of_property_read_u32(clk_mux_np, "reg", &reg_offset);
if (ret)
goto put_clk_mux_np;
reg = pruss->cfg_base + reg_offset;
clk_mux = clk_register_mux(NULL, clk_mux_name, parent_names,
num_parents, 0, reg, 0, 1, 0, NULL);
if (IS_ERR(clk_mux)) {
ret = PTR_ERR(clk_mux);
goto put_clk_mux_np;
}
ret = devm_add_action_or_reset(dev, (void(*)(void *))clk_unregister_mux,
clk_mux);
if (ret) {
dev_err(dev, "failed to add clkmux unregister action %d", ret);
goto put_clk_mux_np;
}
ret = of_clk_add_provider(clk_mux_np, of_clk_src_simple_get, clk_mux);
if (ret)
goto put_clk_mux_np;
ret = devm_add_action_or_reset(dev, pruss_of_free_clk_provider,
clk_mux_np);
if (ret) {
dev_err(dev, "failed to add clkmux free action %d", ret);
goto put_clk_mux_np;
}
return 0;
put_clk_mux_np:
of_node_put(clk_mux_np);
return ret;
}
static int pruss_clk_init(struct pruss *pruss, struct device_node *cfg_node)
{
const struct pruss_private_data *data;
struct device_node *clks_np;
struct device *dev = pruss->dev;
int ret = 0;
data = of_device_get_match_data(dev);
clks_np = of_get_child_by_name(cfg_node, "clocks");
if (!clks_np) {
dev_err(dev, "%pOF is missing its 'clocks' node\n", cfg_node);
return -ENODEV;
}
if (data && data->has_core_mux_clock) {
ret = pruss_clk_mux_setup(pruss, pruss->core_clk_mux,
"coreclk-mux", clks_np);
if (ret) {
dev_err(dev, "failed to setup coreclk-mux\n");
goto put_clks_node;
}
}
ret = pruss_clk_mux_setup(pruss, pruss->iep_clk_mux, "iepclk-mux",
clks_np);
if (ret) {
dev_err(dev, "failed to setup iepclk-mux\n");
goto put_clks_node;
}
put_clks_node:
of_node_put(clks_np);
return ret;
}
static struct regmap_config regmap_conf = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static int pruss_cfg_of_init(struct device *dev, struct pruss *pruss)
{
struct device_node *np = dev_of_node(dev);
struct device_node *child;
struct resource res;
int ret;
child = of_get_child_by_name(np, "cfg");
if (!child) {
dev_err(dev, "%pOF is missing its 'cfg' node\n", child);
return -ENODEV;
}
if (of_address_to_resource(child, 0, &res)) {
ret = -ENOMEM;
goto node_put;
}
pruss->cfg_base = devm_ioremap(dev, res.start, resource_size(&res));
if (!pruss->cfg_base) {
ret = -ENOMEM;
goto node_put;
}
regmap_conf.name = kasprintf(GFP_KERNEL, "%pOFn@%llx", child,
(u64)res.start);
regmap_conf.max_register = resource_size(&res) - 4;
pruss->cfg_regmap = devm_regmap_init_mmio(dev, pruss->cfg_base,
&regmap_conf);
kfree(regmap_conf.name);
if (IS_ERR(pruss->cfg_regmap)) {
dev_err(dev, "regmap_init_mmio failed for cfg, ret = %ld\n",
PTR_ERR(pruss->cfg_regmap));
ret = PTR_ERR(pruss->cfg_regmap);
goto node_put;
}
ret = pruss_clk_init(pruss, child);
if (ret)
dev_err(dev, "pruss_clk_init failed, ret = %d\n", ret);
node_put:
of_node_put(child);
return ret;
}
static int pruss_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev_of_node(dev);
struct device_node *child;
struct pruss *pruss;
struct resource res;
int ret, i, index;
const struct pruss_private_data *data;
const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
data = of_device_get_match_data(&pdev->dev);
ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(dev, "failed to set the DMA coherent mask");
return ret;
}
pruss = devm_kzalloc(dev, sizeof(*pruss), GFP_KERNEL);
if (!pruss)
return -ENOMEM;
pruss->dev = dev;
child = of_get_child_by_name(np, "memories");
if (!child) {
dev_err(dev, "%pOF is missing its 'memories' node\n", child);
return -ENODEV;
}
for (i = 0; i < PRUSS_MEM_MAX; i++) {
/*
* On AM437x one of two PRUSS units don't contain Shared RAM,
* skip it
*/
if (data && data->has_no_sharedram && i == PRUSS_MEM_SHRD_RAM2)
continue;
index = of_property_match_string(child, "reg-names",
mem_names[i]);
if (index < 0) {
of_node_put(child);
return index;
}
if (of_address_to_resource(child, index, &res)) {
of_node_put(child);
return -EINVAL;
}
pruss->mem_regions[i].va = devm_ioremap(dev, res.start,
resource_size(&res));
if (!pruss->mem_regions[i].va) {
dev_err(dev, "failed to parse and map memory resource %d %s\n",
i, mem_names[i]);
of_node_put(child);
return -ENOMEM;
}
pruss->mem_regions[i].pa = res.start;
pruss->mem_regions[i].size = resource_size(&res);
dev_dbg(dev, "memory %8s: pa %pa size 0x%zx va %pK\n",
mem_names[i], &pruss->mem_regions[i].pa,
pruss->mem_regions[i].size, pruss->mem_regions[i].va);
}
of_node_put(child);
platform_set_drvdata(pdev, pruss);
pm_runtime_enable(dev);
ret = pm_runtime_resume_and_get(dev);
if (ret < 0) {
dev_err(dev, "couldn't enable module\n");
goto rpm_disable;
}
ret = pruss_cfg_of_init(dev, pruss);
if (ret < 0)
goto rpm_put;
ret = devm_of_platform_populate(dev);
if (ret) {
dev_err(dev, "failed to register child devices\n");
goto rpm_put;
}
return 0;
rpm_put:
pm_runtime_put_sync(dev);
rpm_disable:
pm_runtime_disable(dev);
return ret;
}
static int pruss_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
devm_of_platform_depopulate(dev);
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return 0;
}
/* instance-specific driver private data */
static const struct pruss_private_data am437x_pruss1_data = {
.has_no_sharedram = false,
};
static const struct pruss_private_data am437x_pruss0_data = {
.has_no_sharedram = true,
};
static const struct pruss_private_data am65x_j721e_pruss_data = {
.has_core_mux_clock = true,
};
static const struct of_device_id pruss_of_match[] = {
{ .compatible = "ti,am3356-pruss" },
{ .compatible = "ti,am4376-pruss0", .data = &am437x_pruss0_data, },
{ .compatible = "ti,am4376-pruss1", .data = &am437x_pruss1_data, },
{ .compatible = "ti,am5728-pruss" },
{ .compatible = "ti,k2g-pruss" },
{ .compatible = "ti,am654-icssg", .data = &am65x_j721e_pruss_data, },
{ .compatible = "ti,j721e-icssg", .data = &am65x_j721e_pruss_data, },
{ .compatible = "ti,am642-icssg", .data = &am65x_j721e_pruss_data, },
{ .compatible = "ti,am625-pruss", .data = &am65x_j721e_pruss_data, },
{},
};
MODULE_DEVICE_TABLE(of, pruss_of_match);
static struct platform_driver pruss_driver = {
.driver = {
.name = "pruss",
.of_match_table = pruss_of_match,
},
.probe = pruss_probe,
.remove = pruss_remove,
};
module_platform_driver(pruss_driver);
MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
MODULE_DESCRIPTION("PRU-ICSS Subsystem Driver");
MODULE_LICENSE("GPL v2");