2017-10-11 04:23:43 +07:00
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/*
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* ti-sysc.c - Texas Instruments sysc interconnect target driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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enum sysc_registers {
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SYSC_REVISION,
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SYSC_SYSCONFIG,
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SYSC_SYSSTATUS,
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SYSC_MAX_REGS,
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};
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static const char * const reg_names[] = { "rev", "sysc", "syss", };
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enum sysc_clocks {
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SYSC_FCK,
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SYSC_ICK,
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SYSC_MAX_CLOCKS,
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};
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static const char * const clock_names[] = { "fck", "ick", };
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/**
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* struct sysc - TI sysc interconnect target module registers and capabilities
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* @dev: struct device pointer
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* @module_pa: physical address of the interconnect target module
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* @module_size: size of the interconnect target module
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* @module_va: virtual address of the interconnect target module
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* @offsets: register offsets from module base
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* @clocks: clocks used by the interconnect target module
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* @legacy_mode: configured for legacy mode if set
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*/
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struct sysc {
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struct device *dev;
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u64 module_pa;
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u32 module_size;
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void __iomem *module_va;
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int offsets[SYSC_MAX_REGS];
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struct clk *clocks[SYSC_MAX_CLOCKS];
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const char *legacy_mode;
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};
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static u32 sysc_read_revision(struct sysc *ddata)
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{
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return readl_relaxed(ddata->module_va +
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ddata->offsets[SYSC_REVISION]);
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}
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static int sysc_get_one_clock(struct sysc *ddata,
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enum sysc_clocks index)
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{
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const char *name;
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int error;
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switch (index) {
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case SYSC_FCK:
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break;
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case SYSC_ICK:
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break;
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default:
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return -EINVAL;
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}
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name = clock_names[index];
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ddata->clocks[index] = devm_clk_get(ddata->dev, name);
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if (IS_ERR(ddata->clocks[index])) {
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if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
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return 0;
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dev_err(ddata->dev, "clock get error for %s: %li\n",
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name, PTR_ERR(ddata->clocks[index]));
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return PTR_ERR(ddata->clocks[index]);
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}
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error = clk_prepare(ddata->clocks[index]);
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if (error) {
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dev_err(ddata->dev, "clock prepare error for %s: %i\n",
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name, error);
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return error;
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}
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return 0;
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}
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static int sysc_get_clocks(struct sysc *ddata)
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{
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int i, error;
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if (ddata->legacy_mode)
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return 0;
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for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
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error = sysc_get_one_clock(ddata, i);
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if (error && error != -ENOENT)
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return error;
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}
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return 0;
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}
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/**
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* sysc_parse_and_check_child_range - parses module IO region from ranges
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* @ddata: device driver data
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*
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* In general we only need rev, syss, and sysc registers and not the whole
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* module range. But we do want the offsets for these registers from the
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* module base. This allows us to check them against the legacy hwmod
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* platform data. Let's also check the ranges are configured properly.
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*/
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static int sysc_parse_and_check_child_range(struct sysc *ddata)
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{
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struct device_node *np = ddata->dev->of_node;
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const __be32 *ranges;
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u32 nr_addr, nr_size;
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int len, error;
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ranges = of_get_property(np, "ranges", &len);
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if (!ranges) {
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dev_err(ddata->dev, "missing ranges for %pOF\n", np);
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return -ENOENT;
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}
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len /= sizeof(*ranges);
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if (len < 3) {
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dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
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return -EINVAL;
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}
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error = of_property_read_u32(np, "#address-cells", &nr_addr);
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if (error)
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return -ENOENT;
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error = of_property_read_u32(np, "#size-cells", &nr_size);
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if (error)
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return -ENOENT;
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if (nr_addr != 1 || nr_size != 1) {
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dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
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return -EINVAL;
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}
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ranges++;
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ddata->module_pa = of_translate_address(np, ranges++);
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ddata->module_size = be32_to_cpup(ranges);
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dev_dbg(ddata->dev, "interconnect target 0x%llx size 0x%x for %pOF\n",
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ddata->module_pa, ddata->module_size, np);
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return 0;
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}
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/**
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* sysc_check_one_child - check child configuration
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* @ddata: device driver data
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* @np: child device node
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*
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* Let's avoid messy situations where we have new interconnect target
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* node but children have "ti,hwmods". These belong to the interconnect
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* target node and are managed by this driver.
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*/
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static int sysc_check_one_child(struct sysc *ddata,
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struct device_node *np)
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{
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const char *name;
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name = of_get_property(np, "ti,hwmods", NULL);
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if (name)
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dev_warn(ddata->dev, "really a child ti,hwmods property?");
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return 0;
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}
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static int sysc_check_children(struct sysc *ddata)
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{
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struct device_node *child;
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int error;
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for_each_child_of_node(ddata->dev->of_node, child) {
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error = sysc_check_one_child(ddata, child);
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if (error)
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return error;
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}
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return 0;
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}
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/**
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* sysc_parse_one - parses the interconnect target module registers
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* @ddata: device driver data
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* @reg: register to parse
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*/
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static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
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{
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struct resource *res;
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const char *name;
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switch (reg) {
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case SYSC_REVISION:
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case SYSC_SYSCONFIG:
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case SYSC_SYSSTATUS:
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name = reg_names[reg];
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break;
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default:
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return -EINVAL;
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}
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res = platform_get_resource_byname(to_platform_device(ddata->dev),
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IORESOURCE_MEM, name);
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if (!res) {
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dev_dbg(ddata->dev, "has no %s register\n", name);
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ddata->offsets[reg] = -ENODEV;
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return 0;
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}
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ddata->offsets[reg] = res->start - ddata->module_pa;
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return 0;
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}
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static int sysc_parse_registers(struct sysc *ddata)
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{
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int i, error;
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for (i = 0; i < SYSC_MAX_REGS; i++) {
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error = sysc_parse_one(ddata, i);
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if (error)
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return error;
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}
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return 0;
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}
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/**
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* sysc_check_registers - check for misconfigured register overlaps
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* @ddata: device driver data
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*/
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static int sysc_check_registers(struct sysc *ddata)
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{
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int i, j, nr_regs = 0, nr_matches = 0;
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for (i = 0; i < SYSC_MAX_REGS; i++) {
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if (ddata->offsets[i] < 0)
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continue;
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if (ddata->offsets[i] > (ddata->module_size - 4)) {
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dev_err(ddata->dev, "register outside module range");
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return -EINVAL;
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}
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for (j = 0; j < SYSC_MAX_REGS; j++) {
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if (ddata->offsets[j] < 0)
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continue;
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if (ddata->offsets[i] == ddata->offsets[j])
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nr_matches++;
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}
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nr_regs++;
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}
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if (nr_regs < 1) {
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dev_err(ddata->dev, "missing registers\n");
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return -EINVAL;
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}
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if (nr_matches > nr_regs) {
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dev_err(ddata->dev, "overlapping registers: (%i/%i)",
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nr_regs, nr_matches);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* syc_ioremap - ioremap register space for the interconnect target module
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* @ddata: deviec driver data
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*
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* Note that the interconnect target module registers can be anywhere
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* within the first child device address space. For example, SGX has
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* them at offset 0x1fc00 in the 32MB module address space. We just
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* what we need around the interconnect target module registers.
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*/
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static int sysc_ioremap(struct sysc *ddata)
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{
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u32 size = 0;
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if (ddata->offsets[SYSC_SYSSTATUS] >= 0)
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size = ddata->offsets[SYSC_SYSSTATUS];
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else if (ddata->offsets[SYSC_SYSCONFIG] >= 0)
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size = ddata->offsets[SYSC_SYSCONFIG];
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else if (ddata->offsets[SYSC_REVISION] >= 0)
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size = ddata->offsets[SYSC_REVISION];
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else
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return -EINVAL;
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size &= 0xfff00;
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size += SZ_256;
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ddata->module_va = devm_ioremap(ddata->dev,
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ddata->module_pa,
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size);
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if (!ddata->module_va)
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return -EIO;
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return 0;
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}
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/**
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* sysc_map_and_check_registers - ioremap and check device registers
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* @ddata: device driver data
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*/
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static int sysc_map_and_check_registers(struct sysc *ddata)
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{
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int error;
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error = sysc_parse_and_check_child_range(ddata);
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if (error)
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return error;
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error = sysc_check_children(ddata);
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if (error)
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return error;
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error = sysc_parse_registers(ddata);
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if (error)
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return error;
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error = sysc_ioremap(ddata);
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if (error)
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return error;
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error = sysc_check_registers(ddata);
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if (error)
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return error;
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return 0;
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}
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/**
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* sysc_show_rev - read and show interconnect target module revision
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* @bufp: buffer to print the information to
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* @ddata: device driver data
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*/
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static int sysc_show_rev(char *bufp, struct sysc *ddata)
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{
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int error, len;
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if (ddata->offsets[SYSC_REVISION] < 0)
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return sprintf(bufp, ":NA");
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error = pm_runtime_get_sync(ddata->dev);
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if (error < 0) {
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pm_runtime_put_noidle(ddata->dev);
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return 0;
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}
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len = sprintf(bufp, ":%08x", sysc_read_revision(ddata));
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pm_runtime_mark_last_busy(ddata->dev);
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pm_runtime_put_autosuspend(ddata->dev);
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return len;
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}
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static int sysc_show_reg(struct sysc *ddata,
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char *bufp, enum sysc_registers reg)
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{
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if (ddata->offsets[reg] < 0)
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return sprintf(bufp, ":NA");
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return sprintf(bufp, ":%x", ddata->offsets[reg]);
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}
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/**
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* sysc_show_registers - show information about interconnect target module
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* @ddata: device driver data
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*/
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static void sysc_show_registers(struct sysc *ddata)
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{
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char buf[128];
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char *bufp = buf;
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int i;
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for (i = 0; i < SYSC_MAX_REGS; i++)
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bufp += sysc_show_reg(ddata, bufp, i);
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bufp += sysc_show_rev(bufp, ddata);
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dev_dbg(ddata->dev, "%llx:%x%s\n",
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ddata->module_pa, ddata->module_size,
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buf);
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}
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2017-10-13 16:25:32 +07:00
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static int __maybe_unused sysc_runtime_suspend(struct device *dev)
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2017-10-11 04:23:43 +07:00
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{
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struct sysc *ddata;
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int i;
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ddata = dev_get_drvdata(dev);
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if (ddata->legacy_mode)
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return 0;
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for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
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if (IS_ERR_OR_NULL(ddata->clocks[i]))
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continue;
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clk_disable(ddata->clocks[i]);
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}
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return 0;
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}
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2017-10-13 16:25:32 +07:00
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static int __maybe_unused sysc_runtime_resume(struct device *dev)
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2017-10-11 04:23:43 +07:00
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{
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struct sysc *ddata;
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int i, error;
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ddata = dev_get_drvdata(dev);
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if (ddata->legacy_mode)
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return 0;
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for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
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if (IS_ERR_OR_NULL(ddata->clocks[i]))
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continue;
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error = clk_enable(ddata->clocks[i]);
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if (error)
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return error;
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}
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return 0;
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}
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static const struct dev_pm_ops sysc_pm_ops = {
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SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
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sysc_runtime_resume,
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NULL)
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};
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static void sysc_unprepare(struct sysc *ddata)
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{
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int i;
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for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
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if (!IS_ERR_OR_NULL(ddata->clocks[i]))
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clk_unprepare(ddata->clocks[i]);
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}
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}
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static int sysc_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct sysc *ddata;
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int error;
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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ddata->dev = &pdev->dev;
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ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
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error = sysc_get_clocks(ddata);
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if (error)
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return error;
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error = sysc_map_and_check_registers(ddata);
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if (error)
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goto unprepare;
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platform_set_drvdata(pdev, ddata);
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pm_runtime_enable(ddata->dev);
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error = pm_runtime_get_sync(ddata->dev);
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if (error < 0) {
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pm_runtime_put_noidle(ddata->dev);
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pm_runtime_disable(ddata->dev);
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goto unprepare;
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}
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pm_runtime_use_autosuspend(ddata->dev);
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sysc_show_registers(ddata);
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error = of_platform_populate(ddata->dev->of_node,
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NULL, NULL, ddata->dev);
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if (error)
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goto err;
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pm_runtime_mark_last_busy(ddata->dev);
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pm_runtime_put_autosuspend(ddata->dev);
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return 0;
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err:
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pm_runtime_dont_use_autosuspend(&pdev->dev);
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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unprepare:
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sysc_unprepare(ddata);
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return error;
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}
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2017-10-14 00:48:40 +07:00
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static int sysc_remove(struct platform_device *pdev)
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{
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struct sysc *ddata = platform_get_drvdata(pdev);
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int error;
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error = pm_runtime_get_sync(ddata->dev);
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if (error < 0) {
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pm_runtime_put_noidle(ddata->dev);
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pm_runtime_disable(ddata->dev);
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goto unprepare;
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}
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of_platform_depopulate(&pdev->dev);
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pm_runtime_dont_use_autosuspend(&pdev->dev);
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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unprepare:
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sysc_unprepare(ddata);
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return 0;
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}
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|
2017-10-11 04:23:43 +07:00
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static const struct of_device_id sysc_match[] = {
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|
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{ .compatible = "ti,sysc-omap2" },
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|
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{ .compatible = "ti,sysc-omap4" },
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|
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{ .compatible = "ti,sysc-omap4-simple" },
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{ .compatible = "ti,sysc-omap3430-sr" },
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|
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{ .compatible = "ti,sysc-omap3630-sr" },
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{ .compatible = "ti,sysc-omap4-sr" },
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|
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{ .compatible = "ti,sysc-omap3-sham" },
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|
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{ .compatible = "ti,sysc-omap-aes" },
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|
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{ .compatible = "ti,sysc-mcasp" },
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|
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{ .compatible = "ti,sysc-usb-host-fs" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, sysc_match);
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static struct platform_driver sysc_driver = {
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|
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.probe = sysc_probe,
|
2017-10-14 00:48:40 +07:00
|
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.remove = sysc_remove,
|
2017-10-11 04:23:43 +07:00
|
|
|
.driver = {
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|
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.name = "ti-sysc",
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.of_match_table = sysc_match,
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.pm = &sysc_pm_ops,
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},
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};
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module_platform_driver(sysc_driver);
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MODULE_DESCRIPTION("TI sysc interconnect target driver");
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|
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MODULE_LICENSE("GPL v2");
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