2 * ti-sysc.c - Texas Instruments sysc interconnect target driver
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9 * kind, whether express or implied; without even the implied warranty
10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
15 #include <linux/clk.h>
16 #include <linux/clkdev.h>
17 #include <linux/delay.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_domain.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/reset.h>
23 #include <linux/of_address.h>
24 #include <linux/of_platform.h>
25 #include <linux/slab.h>
26 #include <linux/iopoll.h>
28 #include <linux/platform_data/ti-sysc.h>
30 #include <dt-bindings/bus/ti-sysc.h>
32 #define MAX_MODULE_SOFTRESET_WAIT 10000
34 static const char * const reg_names[] = { "rev", "sysc", "syss", };
50 static const char * const clock_names[SYSC_ICK + 1] = { "fck", "ick", };
52 #define SYSC_IDLEMODE_MASK 3
53 #define SYSC_CLOCKACTIVITY_MASK 3
56 * struct sysc - TI sysc interconnect target module registers and capabilities
57 * @dev: struct device pointer
58 * @module_pa: physical address of the interconnect target module
59 * @module_size: size of the interconnect target module
60 * @module_va: virtual address of the interconnect target module
61 * @offsets: register offsets from module base
62 * @clocks: clocks used by the interconnect target module
63 * @clock_roles: clock role names for the found clocks
64 * @nr_clocks: number of clocks used by the interconnect target module
65 * @legacy_mode: configured for legacy mode if set
66 * @cap: interconnect target module capabilities
67 * @cfg: interconnect target module configuration
68 * @name: name if available
69 * @revision: interconnect target module revision
70 * @needs_resume: runtime resume needed on resume from suspend
76 void __iomem *module_va;
77 int offsets[SYSC_MAX_REGS];
79 const char **clock_roles;
81 struct reset_control *rsts;
82 const char *legacy_mode;
83 const struct sysc_capabilities *cap;
84 struct sysc_config cfg;
85 struct ti_sysc_cookie cookie;
90 bool child_needs_resume;
91 struct delayed_work idle_work;
94 void sysc_write(struct sysc *ddata, int offset, u32 value)
96 writel_relaxed(value, ddata->module_va + offset);
99 static u32 sysc_read(struct sysc *ddata, int offset)
101 if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
104 val = readw_relaxed(ddata->module_va + offset);
105 val |= (readw_relaxed(ddata->module_va + offset + 4) << 16);
110 return readl_relaxed(ddata->module_va + offset);
113 static bool sysc_opt_clks_needed(struct sysc *ddata)
115 return !!(ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_NEEDED);
118 static u32 sysc_read_revision(struct sysc *ddata)
120 int offset = ddata->offsets[SYSC_REVISION];
125 return sysc_read(ddata, offset);
128 static int sysc_get_one_clock(struct sysc *ddata, const char *name)
130 int error, i, index = -ENODEV;
132 if (!strncmp(clock_names[SYSC_FCK], name, 3))
134 else if (!strncmp(clock_names[SYSC_ICK], name, 3))
138 for (i = SYSC_OPTFCK0; i < SYSC_MAX_CLOCKS; i++) {
139 if (!ddata->clocks[i]) {
147 dev_err(ddata->dev, "clock %s not added\n", name);
151 ddata->clocks[index] = devm_clk_get(ddata->dev, name);
152 if (IS_ERR(ddata->clocks[index])) {
153 if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
156 dev_err(ddata->dev, "clock get error for %s: %li\n",
157 name, PTR_ERR(ddata->clocks[index]));
159 return PTR_ERR(ddata->clocks[index]);
162 error = clk_prepare(ddata->clocks[index]);
164 dev_err(ddata->dev, "clock prepare error for %s: %i\n",
173 static int sysc_get_clocks(struct sysc *ddata)
175 struct device_node *np = ddata->dev->of_node;
176 struct property *prop;
178 int nr_fck = 0, nr_ick = 0, i, error = 0;
180 ddata->clock_roles = devm_kcalloc(ddata->dev,
182 sizeof(*ddata->clock_roles),
184 if (!ddata->clock_roles)
187 of_property_for_each_string(np, "clock-names", prop, name) {
188 if (!strncmp(clock_names[SYSC_FCK], name, 3))
190 if (!strncmp(clock_names[SYSC_ICK], name, 3))
192 ddata->clock_roles[ddata->nr_clocks] = name;
196 if (ddata->nr_clocks < 1)
199 if (ddata->nr_clocks > SYSC_MAX_CLOCKS) {
200 dev_err(ddata->dev, "too many clocks for %pOF\n", np);
205 if (nr_fck > 1 || nr_ick > 1) {
206 dev_err(ddata->dev, "max one fck and ick for %pOF\n", np);
211 ddata->clocks = devm_kcalloc(ddata->dev,
212 ddata->nr_clocks, sizeof(*ddata->clocks),
217 for (i = 0; i < ddata->nr_clocks; i++) {
218 error = sysc_get_one_clock(ddata, ddata->clock_roles[i]);
219 if (error && error != -ENOENT)
227 * sysc_init_resets - reset module on init
228 * @ddata: device driver data
230 * A module can have both OCP softreset control and external rstctrl.
231 * If more complicated rstctrl resets are needed, please handle these
232 * directly from the child device driver and map only the module reset
233 * for the parent interconnect target module device.
235 * Automatic reset of the module on init can be skipped with the
236 * "ti,no-reset-on-init" device tree property.
238 static int sysc_init_resets(struct sysc *ddata)
243 devm_reset_control_array_get_optional_exclusive(ddata->dev);
244 if (IS_ERR(ddata->rsts))
245 return PTR_ERR(ddata->rsts);
247 if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
250 error = reset_control_assert(ddata->rsts);
255 error = reset_control_deassert(ddata->rsts);
263 * sysc_parse_and_check_child_range - parses module IO region from ranges
264 * @ddata: device driver data
266 * In general we only need rev, syss, and sysc registers and not the whole
267 * module range. But we do want the offsets for these registers from the
268 * module base. This allows us to check them against the legacy hwmod
269 * platform data. Let's also check the ranges are configured properly.
271 static int sysc_parse_and_check_child_range(struct sysc *ddata)
273 struct device_node *np = ddata->dev->of_node;
274 const __be32 *ranges;
275 u32 nr_addr, nr_size;
278 ranges = of_get_property(np, "ranges", &len);
280 dev_err(ddata->dev, "missing ranges for %pOF\n", np);
285 len /= sizeof(*ranges);
288 dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
293 error = of_property_read_u32(np, "#address-cells", &nr_addr);
297 error = of_property_read_u32(np, "#size-cells", &nr_size);
301 if (nr_addr != 1 || nr_size != 1) {
302 dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
308 ddata->module_pa = of_translate_address(np, ranges++);
309 ddata->module_size = be32_to_cpup(ranges);
314 static struct device_node *stdout_path;
316 static void sysc_init_stdout_path(struct sysc *ddata)
318 struct device_node *np = NULL;
321 if (IS_ERR(stdout_path))
327 np = of_find_node_by_path("/chosen");
331 uart = of_get_property(np, "stdout-path", NULL);
335 np = of_find_node_by_path(uart);
344 stdout_path = ERR_PTR(-ENODEV);
347 static void sysc_check_quirk_stdout(struct sysc *ddata,
348 struct device_node *np)
350 sysc_init_stdout_path(ddata);
351 if (np != stdout_path)
354 ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
355 SYSC_QUIRK_NO_RESET_ON_INIT;
359 * sysc_check_one_child - check child configuration
360 * @ddata: device driver data
361 * @np: child device node
363 * Let's avoid messy situations where we have new interconnect target
364 * node but children have "ti,hwmods". These belong to the interconnect
365 * target node and are managed by this driver.
367 static int sysc_check_one_child(struct sysc *ddata,
368 struct device_node *np)
372 name = of_get_property(np, "ti,hwmods", NULL);
374 dev_warn(ddata->dev, "really a child ti,hwmods property?");
376 sysc_check_quirk_stdout(ddata, np);
381 static int sysc_check_children(struct sysc *ddata)
383 struct device_node *child;
386 for_each_child_of_node(ddata->dev->of_node, child) {
387 error = sysc_check_one_child(ddata, child);
396 * So far only I2C uses 16-bit read access with clockactivity with revision
397 * in two registers with stride of 4. We can detect this based on the rev
398 * register size to configure things far enough to be able to properly read
399 * the revision register.
401 static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
403 if (resource_size(res) == 8)
404 ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
408 * sysc_parse_one - parses the interconnect target module registers
409 * @ddata: device driver data
410 * @reg: register to parse
412 static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
414 struct resource *res;
421 name = reg_names[reg];
427 res = platform_get_resource_byname(to_platform_device(ddata->dev),
428 IORESOURCE_MEM, name);
430 ddata->offsets[reg] = -ENODEV;
435 ddata->offsets[reg] = res->start - ddata->module_pa;
436 if (reg == SYSC_REVISION)
437 sysc_check_quirk_16bit(ddata, res);
442 static int sysc_parse_registers(struct sysc *ddata)
446 for (i = 0; i < SYSC_MAX_REGS; i++) {
447 error = sysc_parse_one(ddata, i);
456 * sysc_check_registers - check for misconfigured register overlaps
457 * @ddata: device driver data
459 static int sysc_check_registers(struct sysc *ddata)
461 int i, j, nr_regs = 0, nr_matches = 0;
463 for (i = 0; i < SYSC_MAX_REGS; i++) {
464 if (ddata->offsets[i] < 0)
467 if (ddata->offsets[i] > (ddata->module_size - 4)) {
468 dev_err(ddata->dev, "register outside module range");
473 for (j = 0; j < SYSC_MAX_REGS; j++) {
474 if (ddata->offsets[j] < 0)
477 if (ddata->offsets[i] == ddata->offsets[j])
484 dev_err(ddata->dev, "missing registers\n");
489 if (nr_matches > nr_regs) {
490 dev_err(ddata->dev, "overlapping registers: (%i/%i)",
491 nr_regs, nr_matches);
500 * syc_ioremap - ioremap register space for the interconnect target module
501 * @ddata: device driver data
503 * Note that the interconnect target module registers can be anywhere
504 * within the interconnect target module range. For example, SGX has
505 * them at offset 0x1fc00 in the 32MB module address space. And cpsw
506 * has them at offset 0x1200 in the CPSW_WR child. Usually the
507 * the interconnect target module registers are at the beginning of
508 * the module range though.
510 static int sysc_ioremap(struct sysc *ddata)
514 size = max3(ddata->offsets[SYSC_REVISION],
515 ddata->offsets[SYSC_SYSCONFIG],
516 ddata->offsets[SYSC_SYSSTATUS]);
518 if (size < 0 || (size + sizeof(u32)) > ddata->module_size)
521 ddata->module_va = devm_ioremap(ddata->dev,
524 if (!ddata->module_va)
531 * sysc_map_and_check_registers - ioremap and check device registers
532 * @ddata: device driver data
534 static int sysc_map_and_check_registers(struct sysc *ddata)
538 error = sysc_parse_and_check_child_range(ddata);
542 error = sysc_check_children(ddata);
546 error = sysc_parse_registers(ddata);
550 error = sysc_ioremap(ddata);
554 error = sysc_check_registers(ddata);
562 * sysc_show_rev - read and show interconnect target module revision
563 * @bufp: buffer to print the information to
564 * @ddata: device driver data
566 static int sysc_show_rev(char *bufp, struct sysc *ddata)
570 if (ddata->offsets[SYSC_REVISION] < 0)
571 return sprintf(bufp, ":NA");
573 len = sprintf(bufp, ":%08x", ddata->revision);
578 static int sysc_show_reg(struct sysc *ddata,
579 char *bufp, enum sysc_registers reg)
581 if (ddata->offsets[reg] < 0)
582 return sprintf(bufp, ":NA");
584 return sprintf(bufp, ":%x", ddata->offsets[reg]);
587 static int sysc_show_name(char *bufp, struct sysc *ddata)
592 return sprintf(bufp, ":%s", ddata->name);
596 * sysc_show_registers - show information about interconnect target module
597 * @ddata: device driver data
599 static void sysc_show_registers(struct sysc *ddata)
605 for (i = 0; i < SYSC_MAX_REGS; i++)
606 bufp += sysc_show_reg(ddata, bufp, i);
608 bufp += sysc_show_rev(bufp, ddata);
609 bufp += sysc_show_name(bufp, ddata);
611 dev_dbg(ddata->dev, "%llx:%x%s\n",
612 ddata->module_pa, ddata->module_size,
616 static int __maybe_unused sysc_runtime_suspend(struct device *dev)
618 struct ti_sysc_platform_data *pdata;
622 ddata = dev_get_drvdata(dev);
627 if (ddata->legacy_mode) {
628 pdata = dev_get_platdata(ddata->dev);
632 if (!pdata->idle_module)
635 error = pdata->idle_module(dev, &ddata->cookie);
637 dev_err(dev, "%s: could not idle: %i\n",
643 for (i = 0; i < ddata->nr_clocks; i++) {
644 if (IS_ERR_OR_NULL(ddata->clocks[i]))
647 if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
650 clk_disable(ddata->clocks[i]);
654 ddata->enabled = false;
659 static int __maybe_unused sysc_runtime_resume(struct device *dev)
661 struct ti_sysc_platform_data *pdata;
665 ddata = dev_get_drvdata(dev);
670 if (ddata->legacy_mode) {
671 pdata = dev_get_platdata(ddata->dev);
675 if (!pdata->enable_module)
678 error = pdata->enable_module(dev, &ddata->cookie);
680 dev_err(dev, "%s: could not enable: %i\n",
686 for (i = 0; i < ddata->nr_clocks; i++) {
687 if (IS_ERR_OR_NULL(ddata->clocks[i]))
690 if (i >= SYSC_OPTFCK0 && !sysc_opt_clks_needed(ddata))
693 error = clk_enable(ddata->clocks[i]);
699 ddata->enabled = true;
704 #ifdef CONFIG_PM_SLEEP
705 static int sysc_suspend(struct device *dev)
710 ddata = dev_get_drvdata(dev);
712 if (ddata->cfg.quirks & (SYSC_QUIRK_RESOURCE_PROVIDER |
713 SYSC_QUIRK_LEGACY_IDLE))
719 dev_dbg(ddata->dev, "%s %s\n", __func__,
720 ddata->name ? ddata->name : "");
722 error = pm_runtime_put_sync_suspend(dev);
724 dev_warn(ddata->dev, "%s not idle %i %s\n",
726 ddata->name ? ddata->name : "");
731 ddata->needs_resume = true;
736 static int sysc_resume(struct device *dev)
741 ddata = dev_get_drvdata(dev);
743 if (ddata->cfg.quirks & (SYSC_QUIRK_RESOURCE_PROVIDER |
744 SYSC_QUIRK_LEGACY_IDLE))
747 if (ddata->needs_resume) {
748 dev_dbg(ddata->dev, "%s %s\n", __func__,
749 ddata->name ? ddata->name : "");
751 error = pm_runtime_get_sync(dev);
753 dev_err(ddata->dev, "%s error %i %s\n",
755 ddata->name ? ddata->name : "");
760 ddata->needs_resume = false;
766 static int sysc_noirq_suspend(struct device *dev)
770 ddata = dev_get_drvdata(dev);
772 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
775 if (!(ddata->cfg.quirks & SYSC_QUIRK_RESOURCE_PROVIDER))
781 dev_dbg(ddata->dev, "%s %s\n", __func__,
782 ddata->name ? ddata->name : "");
784 ddata->needs_resume = true;
786 return sysc_runtime_suspend(dev);
789 static int sysc_noirq_resume(struct device *dev)
793 ddata = dev_get_drvdata(dev);
795 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
798 if (!(ddata->cfg.quirks & SYSC_QUIRK_RESOURCE_PROVIDER))
801 if (ddata->needs_resume) {
802 dev_dbg(ddata->dev, "%s %s\n", __func__,
803 ddata->name ? ddata->name : "");
805 ddata->needs_resume = false;
807 return sysc_runtime_resume(dev);
814 static const struct dev_pm_ops sysc_pm_ops = {
815 SET_SYSTEM_SLEEP_PM_OPS(sysc_suspend, sysc_resume)
816 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_noirq_suspend, sysc_noirq_resume)
817 SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
822 /* Module revision register based quirks */
823 struct sysc_revision_quirk {
834 #define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss, \
835 optrev_val, optrevmask, optquirkmask) \
839 .rev_offset = (optrev), \
840 .sysc_offset = (optsysc), \
841 .syss_offset = (optsyss), \
842 .revision = (optrev_val), \
843 .revision_mask = (optrevmask), \
844 .quirks = (optquirkmask), \
847 static const struct sysc_revision_quirk sysc_revision_quirks[] = {
848 /* These need to use noirq_suspend */
849 SYSC_QUIRK("control", 0, 0, 0x10, -1, 0x40000900, 0xffffffff,
850 SYSC_QUIRK_RESOURCE_PROVIDER),
851 SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xffffffff,
852 SYSC_QUIRK_RESOURCE_PROVIDER),
853 SYSC_QUIRK("mcspi", 0, 0, 0x10, -1, 0x40300a0b, 0xffffffff,
854 SYSC_QUIRK_RESOURCE_PROVIDER),
855 SYSC_QUIRK("prcm", 0, 0, -1, -1, 0x40000100, 0xffffffff,
856 SYSC_QUIRK_RESOURCE_PROVIDER),
857 SYSC_QUIRK("ocp2scp", 0, 0, 0x10, 0x14, 0x50060005, 0xffffffff,
858 SYSC_QUIRK_RESOURCE_PROVIDER),
859 SYSC_QUIRK("padconf", 0, 0, 0x10, -1, 0x4fff0800, 0xffffffff,
860 SYSC_QUIRK_RESOURCE_PROVIDER),
861 SYSC_QUIRK("scm", 0, 0, 0x10, -1, 0x40000900, 0xffffffff,
862 SYSC_QUIRK_RESOURCE_PROVIDER),
863 SYSC_QUIRK("scrm", 0, 0, -1, -1, 0x00000010, 0xffffffff,
864 SYSC_QUIRK_RESOURCE_PROVIDER),
865 SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff,
866 SYSC_QUIRK_RESOURCE_PROVIDER),
868 /* These drivers need to be fixed to not use pm_runtime_irq_safe() */
869 SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffffffff,
870 SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
871 SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000020, 0xffffffff,
872 SYSC_QUIRK_LEGACY_IDLE),
873 SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000030, 0xffffffff,
874 SYSC_QUIRK_LEGACY_IDLE),
875 SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
876 SYSC_QUIRK_LEGACY_IDLE),
877 SYSC_QUIRK("smartreflex", 0, -1, 0x24, -1, 0x00000000, 0xffffffff,
878 SYSC_QUIRK_LEGACY_IDLE),
879 SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff,
880 SYSC_QUIRK_LEGACY_IDLE),
881 SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff,
882 SYSC_QUIRK_LEGACY_IDLE),
883 /* Some timers on omap4 and later */
884 SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffffffff,
885 SYSC_QUIRK_LEGACY_IDLE),
886 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
887 SYSC_QUIRK_LEGACY_IDLE),
888 /* Uarts on omap4 and later */
889 SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffffffff,
890 SYSC_QUIRK_LEGACY_IDLE),
892 /* These devices don't yet suspend properly without legacy setting */
893 SYSC_QUIRK("sdio", 0, 0, 0x10, -1, 0x40202301, 0xffffffff,
894 SYSC_QUIRK_LEGACY_IDLE),
895 SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xffffffff,
896 SYSC_QUIRK_LEGACY_IDLE),
897 SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0d00, 0xffffffff,
898 SYSC_QUIRK_LEGACY_IDLE),
901 SYSC_QUIRK("aess", 0, 0, 0x10, -1, 0x40000000, 0xffffffff, 0),
902 SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0),
903 SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff, 0),
904 SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0),
905 SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0),
906 SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0),
907 SYSC_QUIRK("mcbsp", 0, -1, 0x8c, -1, 0, 0, 0),
908 SYSC_QUIRK("mailbox", 0, 0, 0x10, -1, 0x00000400, 0xffffffff, 0),
909 SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40000902, 0xffffffff, 0),
910 SYSC_QUIRK("slimbus", 0, 0, 0x10, -1, 0x40002903, 0xffffffff, 0),
911 SYSC_QUIRK("spinlock", 0, 0, 0x10, -1, 0x50020000, 0xffffffff, 0),
912 SYSC_QUIRK("usbhstll", 0, 0, 0x10, 0x14, 0x00000004, 0xffffffff, 0),
913 SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, 0x14, 0x50700100, 0xffffffff, 0),
914 SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
919 static void sysc_init_revision_quirks(struct sysc *ddata)
921 const struct sysc_revision_quirk *q;
924 for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) {
925 q = &sysc_revision_quirks[i];
927 if (q->base && q->base != ddata->module_pa)
930 if (q->rev_offset >= 0 &&
931 q->rev_offset != ddata->offsets[SYSC_REVISION])
934 if (q->sysc_offset >= 0 &&
935 q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG])
938 if (q->syss_offset >= 0 &&
939 q->syss_offset != ddata->offsets[SYSC_SYSSTATUS])
942 if (q->revision == ddata->revision ||
943 (q->revision & q->revision_mask) ==
944 (ddata->revision & q->revision_mask)) {
945 ddata->name = q->name;
946 ddata->cfg.quirks |= q->quirks;
951 static int sysc_reset(struct sysc *ddata)
953 int offset = ddata->offsets[SYSC_SYSCONFIG];
956 if (ddata->legacy_mode || offset < 0 ||
957 ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
961 * Currently only support reset status in sysstatus.
962 * Warn and return error in all other cases
964 if (!ddata->cfg.syss_mask) {
965 dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n");
969 val = sysc_read(ddata, offset);
970 val |= (0x1 << ddata->cap->regbits->srst_shift);
971 sysc_write(ddata, offset, val);
973 /* Poll on reset status */
974 offset = ddata->offsets[SYSC_SYSSTATUS];
976 return readl_poll_timeout(ddata->module_va + offset, val,
977 (val & ddata->cfg.syss_mask) == 0x0,
978 100, MAX_MODULE_SOFTRESET_WAIT);
981 /* At this point the module is configured enough to read the revision */
982 static int sysc_init_module(struct sysc *ddata)
986 if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE_ON_INIT) {
987 ddata->revision = sysc_read_revision(ddata);
991 error = pm_runtime_get_sync(ddata->dev);
993 pm_runtime_put_noidle(ddata->dev);
998 error = sysc_reset(ddata);
1000 dev_err(ddata->dev, "Reset failed with %d\n", error);
1001 pm_runtime_put_sync(ddata->dev);
1006 ddata->revision = sysc_read_revision(ddata);
1007 pm_runtime_put_sync(ddata->dev);
1010 sysc_init_revision_quirks(ddata);
1015 static int sysc_init_sysc_mask(struct sysc *ddata)
1017 struct device_node *np = ddata->dev->of_node;
1021 error = of_property_read_u32(np, "ti,sysc-mask", &val);
1026 ddata->cfg.sysc_val = val & ddata->cap->sysc_mask;
1028 ddata->cfg.sysc_val = ddata->cap->sysc_mask;
1033 static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
1036 struct device_node *np = ddata->dev->of_node;
1037 struct property *prop;
1041 of_property_for_each_u32(np, name, prop, p, val) {
1042 if (val >= SYSC_NR_IDLEMODES) {
1043 dev_err(ddata->dev, "invalid idlemode: %i\n", val);
1046 *idlemodes |= (1 << val);
1052 static int sysc_init_idlemodes(struct sysc *ddata)
1056 error = sysc_init_idlemode(ddata, &ddata->cfg.midlemodes,
1061 error = sysc_init_idlemode(ddata, &ddata->cfg.sidlemodes,
1070 * Only some devices on omap4 and later have SYSCONFIG reset done
1071 * bit. We can detect this if there is no SYSSTATUS at all, or the
1072 * SYSTATUS bit 0 is not used. Note that some SYSSTATUS registers
1073 * have multiple bits for the child devices like OHCI and EHCI.
1074 * Depends on SYSC being parsed first.
1076 static int sysc_init_syss_mask(struct sysc *ddata)
1078 struct device_node *np = ddata->dev->of_node;
1082 error = of_property_read_u32(np, "ti,syss-mask", &val);
1084 if ((ddata->cap->type == TI_SYSC_OMAP4 ||
1085 ddata->cap->type == TI_SYSC_OMAP4_TIMER) &&
1086 (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1087 ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1092 if (!(val & 1) && (ddata->cfg.sysc_val & SYSC_OMAP4_SOFTRESET))
1093 ddata->cfg.quirks |= SYSC_QUIRK_RESET_STATUS;
1095 ddata->cfg.syss_mask = val;
1101 * Many child device drivers need to have fck and opt clocks available
1102 * to get the clock rate for device internal configuration etc.
1104 static int sysc_child_add_named_clock(struct sysc *ddata,
1105 struct device *child,
1109 struct clk_lookup *l;
1115 clk = clk_get(child, name);
1122 clk = clk_get(ddata->dev, name);
1126 l = clkdev_create(clk, name, dev_name(child));
1135 static int sysc_child_add_clocks(struct sysc *ddata,
1136 struct device *child)
1140 for (i = 0; i < ddata->nr_clocks; i++) {
1141 error = sysc_child_add_named_clock(ddata,
1143 ddata->clock_roles[i]);
1144 if (error && error != -EEXIST) {
1145 dev_err(ddata->dev, "could not add child clock %s: %i\n",
1146 ddata->clock_roles[i], error);
1155 static struct device_type sysc_device_type = {
1158 static struct sysc *sysc_child_to_parent(struct device *dev)
1160 struct device *parent = dev->parent;
1162 if (!parent || parent->type != &sysc_device_type)
1165 return dev_get_drvdata(parent);
1168 static int __maybe_unused sysc_child_runtime_suspend(struct device *dev)
1173 ddata = sysc_child_to_parent(dev);
1175 error = pm_generic_runtime_suspend(dev);
1179 if (!ddata->enabled)
1182 return sysc_runtime_suspend(ddata->dev);
1185 static int __maybe_unused sysc_child_runtime_resume(struct device *dev)
1190 ddata = sysc_child_to_parent(dev);
1192 if (!ddata->enabled) {
1193 error = sysc_runtime_resume(ddata->dev);
1196 "%s error: %i\n", __func__, error);
1199 return pm_generic_runtime_resume(dev);
1202 #ifdef CONFIG_PM_SLEEP
1203 static int sysc_child_suspend_noirq(struct device *dev)
1208 ddata = sysc_child_to_parent(dev);
1210 dev_dbg(ddata->dev, "%s %s\n", __func__,
1211 ddata->name ? ddata->name : "");
1213 error = pm_generic_suspend_noirq(dev);
1215 dev_err(dev, "%s error at %i: %i\n",
1216 __func__, __LINE__, error);
1221 if (!pm_runtime_status_suspended(dev)) {
1222 error = pm_generic_runtime_suspend(dev);
1224 dev_warn(dev, "%s busy at %i: %i\n",
1225 __func__, __LINE__, error);
1230 error = sysc_runtime_suspend(ddata->dev);
1232 dev_err(dev, "%s error at %i: %i\n",
1233 __func__, __LINE__, error);
1238 ddata->child_needs_resume = true;
1244 static int sysc_child_resume_noirq(struct device *dev)
1249 ddata = sysc_child_to_parent(dev);
1251 dev_dbg(ddata->dev, "%s %s\n", __func__,
1252 ddata->name ? ddata->name : "");
1254 if (ddata->child_needs_resume) {
1255 ddata->child_needs_resume = false;
1257 error = sysc_runtime_resume(ddata->dev);
1260 "%s runtime resume error: %i\n",
1263 error = pm_generic_runtime_resume(dev);
1266 "%s generic runtime resume: %i\n",
1270 return pm_generic_resume_noirq(dev);
1274 struct dev_pm_domain sysc_child_pm_domain = {
1276 SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend,
1277 sysc_child_runtime_resume,
1279 USE_PLATFORM_PM_SLEEP_OPS
1280 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq,
1281 sysc_child_resume_noirq)
1286 * sysc_legacy_idle_quirk - handle children in omap_device compatible way
1287 * @ddata: device driver data
1288 * @child: child device driver
1290 * Allow idle for child devices as done with _od_runtime_suspend().
1291 * Otherwise many child devices will not idle because of the permanent
1292 * parent usecount set in pm_runtime_irq_safe().
1294 * Note that the long term solution is to just modify the child device
1295 * drivers to not set pm_runtime_irq_safe() and then this can be just
1298 static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child)
1300 if (!ddata->legacy_mode)
1303 if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE)
1304 dev_pm_domain_set(child, &sysc_child_pm_domain);
1307 static int sysc_notifier_call(struct notifier_block *nb,
1308 unsigned long event, void *device)
1310 struct device *dev = device;
1314 ddata = sysc_child_to_parent(dev);
1319 case BUS_NOTIFY_ADD_DEVICE:
1320 error = sysc_child_add_clocks(ddata, dev);
1323 sysc_legacy_idle_quirk(ddata, dev);
1332 static struct notifier_block sysc_nb = {
1333 .notifier_call = sysc_notifier_call,
1336 /* Device tree configured quirks */
1337 struct sysc_dts_quirk {
1342 static const struct sysc_dts_quirk sysc_dts_quirks[] = {
1343 { .name = "ti,no-idle-on-init",
1344 .mask = SYSC_QUIRK_NO_IDLE_ON_INIT, },
1345 { .name = "ti,no-reset-on-init",
1346 .mask = SYSC_QUIRK_NO_RESET_ON_INIT, },
1349 static int sysc_init_dts_quirks(struct sysc *ddata)
1351 struct device_node *np = ddata->dev->of_node;
1352 const struct property *prop;
1356 ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
1358 for (i = 0; i < ARRAY_SIZE(sysc_dts_quirks); i++) {
1359 prop = of_get_property(np, sysc_dts_quirks[i].name, &len);
1363 ddata->cfg.quirks |= sysc_dts_quirks[i].mask;
1366 error = of_property_read_u32(np, "ti,sysc-delay-us", &val);
1369 dev_warn(ddata->dev, "bad ti,sysc-delay-us: %i\n",
1373 ddata->cfg.srst_udelay = (u8)val;
1379 static void sysc_unprepare(struct sysc *ddata)
1383 for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
1384 if (!IS_ERR_OR_NULL(ddata->clocks[i]))
1385 clk_unprepare(ddata->clocks[i]);
1390 * Common sysc register bits found on omap2, also known as type1
1392 static const struct sysc_regbits sysc_regbits_omap2 = {
1393 .dmadisable_shift = -ENODEV,
1400 .autoidle_shift = 0,
1403 static const struct sysc_capabilities sysc_omap2 = {
1404 .type = TI_SYSC_OMAP2,
1405 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
1406 SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
1407 SYSC_OMAP2_AUTOIDLE,
1408 .regbits = &sysc_regbits_omap2,
1411 /* All omap2 and 3 timers, and timers 1, 2 & 10 on omap 4 and 5 */
1412 static const struct sysc_capabilities sysc_omap2_timer = {
1413 .type = TI_SYSC_OMAP2_TIMER,
1414 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY | SYSC_OMAP2_EMUFREE |
1415 SYSC_OMAP2_ENAWAKEUP | SYSC_OMAP2_SOFTRESET |
1416 SYSC_OMAP2_AUTOIDLE,
1417 .regbits = &sysc_regbits_omap2,
1418 .mod_quirks = SYSC_QUIRK_USE_CLOCKACT,
1422 * SHAM2 (SHA1/MD5) sysc found on omap3, a variant of sysc_regbits_omap2
1423 * with different sidle position
1425 static const struct sysc_regbits sysc_regbits_omap3_sham = {
1426 .dmadisable_shift = -ENODEV,
1427 .midle_shift = -ENODEV,
1429 .clkact_shift = -ENODEV,
1430 .enwkup_shift = -ENODEV,
1432 .autoidle_shift = 0,
1433 .emufree_shift = -ENODEV,
1436 static const struct sysc_capabilities sysc_omap3_sham = {
1437 .type = TI_SYSC_OMAP3_SHAM,
1438 .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
1439 .regbits = &sysc_regbits_omap3_sham,
1443 * AES register bits found on omap3 and later, a variant of
1444 * sysc_regbits_omap2 with different sidle position
1446 static const struct sysc_regbits sysc_regbits_omap3_aes = {
1447 .dmadisable_shift = -ENODEV,
1448 .midle_shift = -ENODEV,
1450 .clkact_shift = -ENODEV,
1451 .enwkup_shift = -ENODEV,
1453 .autoidle_shift = 0,
1454 .emufree_shift = -ENODEV,
1457 static const struct sysc_capabilities sysc_omap3_aes = {
1458 .type = TI_SYSC_OMAP3_AES,
1459 .sysc_mask = SYSC_OMAP2_SOFTRESET | SYSC_OMAP2_AUTOIDLE,
1460 .regbits = &sysc_regbits_omap3_aes,
1464 * Common sysc register bits found on omap4, also known as type2
1466 static const struct sysc_regbits sysc_regbits_omap4 = {
1467 .dmadisable_shift = 16,
1470 .clkact_shift = -ENODEV,
1471 .enwkup_shift = -ENODEV,
1474 .autoidle_shift = -ENODEV,
1477 static const struct sysc_capabilities sysc_omap4 = {
1478 .type = TI_SYSC_OMAP4,
1479 .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
1480 SYSC_OMAP4_SOFTRESET,
1481 .regbits = &sysc_regbits_omap4,
1484 static const struct sysc_capabilities sysc_omap4_timer = {
1485 .type = TI_SYSC_OMAP4_TIMER,
1486 .sysc_mask = SYSC_OMAP4_DMADISABLE | SYSC_OMAP4_FREEEMU |
1487 SYSC_OMAP4_SOFTRESET,
1488 .regbits = &sysc_regbits_omap4,
1492 * Common sysc register bits found on omap4, also known as type3
1494 static const struct sysc_regbits sysc_regbits_omap4_simple = {
1495 .dmadisable_shift = -ENODEV,
1498 .clkact_shift = -ENODEV,
1499 .enwkup_shift = -ENODEV,
1500 .srst_shift = -ENODEV,
1501 .emufree_shift = -ENODEV,
1502 .autoidle_shift = -ENODEV,
1505 static const struct sysc_capabilities sysc_omap4_simple = {
1506 .type = TI_SYSC_OMAP4_SIMPLE,
1507 .regbits = &sysc_regbits_omap4_simple,
1511 * SmartReflex sysc found on omap34xx
1513 static const struct sysc_regbits sysc_regbits_omap34xx_sr = {
1514 .dmadisable_shift = -ENODEV,
1515 .midle_shift = -ENODEV,
1516 .sidle_shift = -ENODEV,
1518 .enwkup_shift = -ENODEV,
1519 .srst_shift = -ENODEV,
1520 .emufree_shift = -ENODEV,
1521 .autoidle_shift = -ENODEV,
1524 static const struct sysc_capabilities sysc_34xx_sr = {
1525 .type = TI_SYSC_OMAP34XX_SR,
1526 .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY,
1527 .regbits = &sysc_regbits_omap34xx_sr,
1528 .mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED |
1529 SYSC_QUIRK_LEGACY_IDLE,
1533 * SmartReflex sysc found on omap36xx and later
1535 static const struct sysc_regbits sysc_regbits_omap36xx_sr = {
1536 .dmadisable_shift = -ENODEV,
1537 .midle_shift = -ENODEV,
1539 .clkact_shift = -ENODEV,
1541 .srst_shift = -ENODEV,
1542 .emufree_shift = -ENODEV,
1543 .autoidle_shift = -ENODEV,
1546 static const struct sysc_capabilities sysc_36xx_sr = {
1547 .type = TI_SYSC_OMAP36XX_SR,
1548 .sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP,
1549 .regbits = &sysc_regbits_omap36xx_sr,
1550 .mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE,
1553 static const struct sysc_capabilities sysc_omap4_sr = {
1554 .type = TI_SYSC_OMAP4_SR,
1555 .regbits = &sysc_regbits_omap36xx_sr,
1556 .mod_quirks = SYSC_QUIRK_LEGACY_IDLE,
1560 * McASP register bits found on omap4 and later
1562 static const struct sysc_regbits sysc_regbits_omap4_mcasp = {
1563 .dmadisable_shift = -ENODEV,
1564 .midle_shift = -ENODEV,
1566 .clkact_shift = -ENODEV,
1567 .enwkup_shift = -ENODEV,
1568 .srst_shift = -ENODEV,
1569 .emufree_shift = -ENODEV,
1570 .autoidle_shift = -ENODEV,
1573 static const struct sysc_capabilities sysc_omap4_mcasp = {
1574 .type = TI_SYSC_OMAP4_MCASP,
1575 .regbits = &sysc_regbits_omap4_mcasp,
1579 * FS USB host found on omap4 and later
1581 static const struct sysc_regbits sysc_regbits_omap4_usb_host_fs = {
1582 .dmadisable_shift = -ENODEV,
1583 .midle_shift = -ENODEV,
1585 .clkact_shift = -ENODEV,
1587 .srst_shift = -ENODEV,
1588 .emufree_shift = -ENODEV,
1589 .autoidle_shift = -ENODEV,
1592 static const struct sysc_capabilities sysc_omap4_usb_host_fs = {
1593 .type = TI_SYSC_OMAP4_USB_HOST_FS,
1594 .sysc_mask = SYSC_OMAP2_ENAWAKEUP,
1595 .regbits = &sysc_regbits_omap4_usb_host_fs,
1598 static const struct sysc_regbits sysc_regbits_dra7_mcan = {
1599 .dmadisable_shift = -ENODEV,
1600 .midle_shift = -ENODEV,
1601 .sidle_shift = -ENODEV,
1602 .clkact_shift = -ENODEV,
1605 .emufree_shift = -ENODEV,
1606 .autoidle_shift = -ENODEV,
1609 static const struct sysc_capabilities sysc_dra7_mcan = {
1610 .type = TI_SYSC_DRA7_MCAN,
1611 .sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET,
1612 .regbits = &sysc_regbits_dra7_mcan,
1615 static int sysc_init_pdata(struct sysc *ddata)
1617 struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev);
1618 struct ti_sysc_module_data mdata;
1621 if (!pdata || !ddata->legacy_mode)
1624 mdata.name = ddata->legacy_mode;
1625 mdata.module_pa = ddata->module_pa;
1626 mdata.module_size = ddata->module_size;
1627 mdata.offsets = ddata->offsets;
1628 mdata.nr_offsets = SYSC_MAX_REGS;
1629 mdata.cap = ddata->cap;
1630 mdata.cfg = &ddata->cfg;
1632 if (!pdata->init_module)
1635 error = pdata->init_module(ddata->dev, &mdata, &ddata->cookie);
1636 if (error == -EEXIST)
1642 static int sysc_init_match(struct sysc *ddata)
1644 const struct sysc_capabilities *cap;
1646 cap = of_device_get_match_data(ddata->dev);
1652 ddata->cfg.quirks |= ddata->cap->mod_quirks;
1657 static void ti_sysc_idle(struct work_struct *work)
1661 ddata = container_of(work, struct sysc, idle_work.work);
1663 if (pm_runtime_active(ddata->dev))
1664 pm_runtime_put_sync(ddata->dev);
1667 static const struct of_device_id sysc_match_table[] = {
1668 { .compatible = "simple-bus", },
1672 static int sysc_probe(struct platform_device *pdev)
1674 struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev);
1678 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
1682 ddata->dev = &pdev->dev;
1683 platform_set_drvdata(pdev, ddata);
1685 error = sysc_init_match(ddata);
1689 error = sysc_init_dts_quirks(ddata);
1693 error = sysc_get_clocks(ddata);
1697 error = sysc_map_and_check_registers(ddata);
1701 error = sysc_init_sysc_mask(ddata);
1705 error = sysc_init_idlemodes(ddata);
1709 error = sysc_init_syss_mask(ddata);
1713 error = sysc_init_pdata(ddata);
1717 error = sysc_init_resets(ddata);
1721 pm_runtime_enable(ddata->dev);
1722 error = sysc_init_module(ddata);
1726 error = pm_runtime_get_sync(ddata->dev);
1728 pm_runtime_put_noidle(ddata->dev);
1729 pm_runtime_disable(ddata->dev);
1733 sysc_show_registers(ddata);
1735 ddata->dev->type = &sysc_device_type;
1736 error = of_platform_populate(ddata->dev->of_node, sysc_match_table,
1737 pdata ? pdata->auxdata : NULL,
1742 INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle);
1744 /* At least earlycon won't survive without deferred idle */
1745 if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE_ON_INIT |
1746 SYSC_QUIRK_NO_RESET_ON_INIT)) {
1747 schedule_delayed_work(&ddata->idle_work, 3000);
1749 pm_runtime_put(&pdev->dev);
1752 if (!of_get_available_child_count(ddata->dev->of_node))
1753 reset_control_assert(ddata->rsts);
1758 pm_runtime_put_sync(&pdev->dev);
1759 pm_runtime_disable(&pdev->dev);
1761 sysc_unprepare(ddata);
1766 static int sysc_remove(struct platform_device *pdev)
1768 struct sysc *ddata = platform_get_drvdata(pdev);
1771 cancel_delayed_work_sync(&ddata->idle_work);
1773 error = pm_runtime_get_sync(ddata->dev);
1775 pm_runtime_put_noidle(ddata->dev);
1776 pm_runtime_disable(ddata->dev);
1780 of_platform_depopulate(&pdev->dev);
1782 pm_runtime_put_sync(&pdev->dev);
1783 pm_runtime_disable(&pdev->dev);
1784 reset_control_assert(ddata->rsts);
1787 sysc_unprepare(ddata);
1792 static const struct of_device_id sysc_match[] = {
1793 { .compatible = "ti,sysc-omap2", .data = &sysc_omap2, },
1794 { .compatible = "ti,sysc-omap2-timer", .data = &sysc_omap2_timer, },
1795 { .compatible = "ti,sysc-omap4", .data = &sysc_omap4, },
1796 { .compatible = "ti,sysc-omap4-timer", .data = &sysc_omap4_timer, },
1797 { .compatible = "ti,sysc-omap4-simple", .data = &sysc_omap4_simple, },
1798 { .compatible = "ti,sysc-omap3430-sr", .data = &sysc_34xx_sr, },
1799 { .compatible = "ti,sysc-omap3630-sr", .data = &sysc_36xx_sr, },
1800 { .compatible = "ti,sysc-omap4-sr", .data = &sysc_omap4_sr, },
1801 { .compatible = "ti,sysc-omap3-sham", .data = &sysc_omap3_sham, },
1802 { .compatible = "ti,sysc-omap-aes", .data = &sysc_omap3_aes, },
1803 { .compatible = "ti,sysc-mcasp", .data = &sysc_omap4_mcasp, },
1804 { .compatible = "ti,sysc-usb-host-fs",
1805 .data = &sysc_omap4_usb_host_fs, },
1806 { .compatible = "ti,sysc-dra7-mcan", .data = &sysc_dra7_mcan, },
1809 MODULE_DEVICE_TABLE(of, sysc_match);
1811 static struct platform_driver sysc_driver = {
1812 .probe = sysc_probe,
1813 .remove = sysc_remove,
1816 .of_match_table = sysc_match,
1821 static int __init sysc_init(void)
1823 bus_register_notifier(&platform_bus_type, &sysc_nb);
1825 return platform_driver_register(&sysc_driver);
1827 module_init(sysc_init);
1829 static void __exit sysc_exit(void)
1831 bus_unregister_notifier(&platform_bus_type, &sysc_nb);
1832 platform_driver_unregister(&sysc_driver);
1834 module_exit(sysc_exit);
1836 MODULE_DESCRIPTION("TI sysc interconnect target driver");
1837 MODULE_LICENSE("GPL v2");