1 // SPDX-License-Identifier: GPL-2.0
3  * R9A06G032 clock driver
11 #include <linux/clk-provider.h>
25 #include <linux/soc/renesas/r9a06g032-sysctrl.h>
27 #include <dt-bindings/clock/r9a06g032-sysctrl.h>
42  * struct regbit - describe one bit in a register
44  *          expressed in units of 32-bit words (not bytes),
52  * Since registers are aligned on 32-bit boundaries, the
53  * offset will be specified in 32-bit words rather than bytes.
57  * offset from bytes to 32-bit words.
70  * struct r9a06g032_gate - clock-related control bits
83  * de-asserted to bring the module out of reset.
105  * struct r9a06g032_clkdesc - describe a single clock
117  * @div.reg:   clock divider register offset, in 32-bit words
120  * @ffc:       substructure for fixed-factor clocks
121  * @ffc.div:   divisor for fixed-factor clock
122  * @ffc.mul:   multiplier for fixed-factor clock
693 		return -EPROBE_DEFER;  in r9a06g032_sysctrl_set_dmamux()
695 	spin_lock_irqsave(&sysctrl_priv->lock, flags);  in r9a06g032_sysctrl_set_dmamux()
697 	dmamux = readl(sysctrl_priv->reg + R9A06G032_SYSCTRL_DMAMUX);  in r9a06g032_sysctrl_set_dmamux()
700 	writel(dmamux, sysctrl_priv->reg + R9A06G032_SYSCTRL_DMAMUX);  in r9a06g032_sysctrl_set_dmamux()
702 	spin_unlock_irqrestore(&sysctrl_priv->lock, flags);  in r9a06g032_sysctrl_set_dmamux()
711 	u32 __iomem *reg = clocks->reg + (rb.reg * 4);  in clk_rdesc_set()
724 	u32 __iomem *reg = clocks->reg + (rb.reg * 4);  in clk_rdesc_get()
731  * This implements the R9A06G032 clock gate 'driver'. We cannot use the system's
732  * clock gate framework as the gates on the R9A06G032 have a special enabling
773 	struct device_node *np = dev->of_node;  in r9a06g032_attach_dev()
779 	while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i++,  in r9a06g032_attach_dev()
781 		if (clkspec.np != pd->dev.of_node)  in r9a06g032_attach_dev()
805 	struct device_node *np = dev->of_node;  in r9a06g032_add_clk_domain()
810 		return -ENOMEM;  in r9a06g032_add_clk_domain()
812 	pd->name = np->name;  in r9a06g032_add_clk_domain()
813 	pd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON |  in r9a06g032_add_clk_domain()
815 	pd->attach_dev = r9a06g032_attach_dev;  in r9a06g032_add_clk_domain()
816 	pd->detach_dev = r9a06g032_detach_dev;  in r9a06g032_add_clk_domain()
829 	WARN_ON(!g->gate.reg && !g->gate.bit);  in r9a06g032_clk_gate_set()
831 	spin_lock_irqsave(&clocks->lock, flags);  in r9a06g032_clk_gate_set()
832 	clk_rdesc_set(clocks, g->gate, on);  in r9a06g032_clk_gate_set()
833 	/* De-assert reset */  in r9a06g032_clk_gate_set()
834 	clk_rdesc_set(clocks, g->reset, 1);  in r9a06g032_clk_gate_set()
835 	spin_unlock_irqrestore(&clocks->lock, flags);  in r9a06g032_clk_gate_set()
844 	spin_lock_irqsave(&clocks->lock, flags);  in r9a06g032_clk_gate_set()
845 	clk_rdesc_set(clocks, g->ready, on);  in r9a06g032_clk_gate_set()
847 	clk_rdesc_set(clocks, g->midle, !on);  in r9a06g032_clk_gate_set()
848 	spin_unlock_irqrestore(&clocks->lock, flags);  in r9a06g032_clk_gate_set()
857 	r9a06g032_clk_gate_set(g->clocks, &g->gate, 1);  in r9a06g032_clk_gate_enable()
865 	r9a06g032_clk_gate_set(g->clocks, &g->gate, 0);  in r9a06g032_clk_gate_disable()
873 	if (g->gate.reset.reg && !clk_rdesc_get(g->clocks, g->gate.reset))  in r9a06g032_clk_gate_is_enabled()
876 	return clk_rdesc_get(g->clocks, g->gate.gate);  in r9a06g032_clk_gate_is_enabled()
898 	init.name = desc->name;  in r9a06g032_register_gate()
904 	g->clocks = clocks;  in r9a06g032_register_gate()
905 	g->index = desc->index;  in r9a06g032_register_gate()
906 	g->gate = desc->gate;  in r9a06g032_register_gate()
907 	g->hw.init = &init;  in r9a06g032_register_gate()
914 	if (r9a06g032_clk_gate_is_enabled(&g->hw)) {  in r9a06g032_register_gate()
916 		pr_debug("%s was enabled, making read-only\n", desc->name);  in r9a06g032_register_gate()
919 	clk = clk_register(NULL, &g->hw);  in r9a06g032_register_gate()
945 	u32 __iomem *reg = clk->clocks->reg + (4 * clk->reg);  in r9a06g032_div_recalc_rate()
948 	if (div < clk->min)  in r9a06g032_div_recalc_rate()
949 		div = clk->min;  in r9a06g032_div_recalc_rate()
950 	else if (div > clk->max)  in r9a06g032_div_recalc_rate()
951 		div = clk->max;  in r9a06g032_div_recalc_rate()
969 	if (div <= clk->min)  in r9a06g032_div_clamp_div()
970 		return clk->min;  in r9a06g032_div_clamp_div()
971 	if (div >= clk->max)  in r9a06g032_div_clamp_div()
972 		return clk->max;  in r9a06g032_div_clamp_div()
974 	for (i = 0; clk->table_size && i < clk->table_size - 1; i++) {  in r9a06g032_div_clamp_div()
975 		if (div >= clk->table[i] && div <= clk->table[i + 1]) {  in r9a06g032_div_clamp_div()
976 			unsigned long m = rate -  in r9a06g032_div_clamp_div()
977 				DIV_ROUND_UP(prate, clk->table[i]);  in r9a06g032_div_clamp_div()
979 				DIV_ROUND_UP(prate, clk->table[i + 1]) -  in r9a06g032_div_clamp_div()
985 			div = p >= m ? clk->table[i] : clk->table[i + 1];  in r9a06g032_div_clamp_div()
996 	u32 div = DIV_ROUND_UP(req->best_parent_rate, req->rate);  in r9a06g032_div_determine_rate()
999 		 hw->clk, req->rate, req->best_parent_rate, div);  in r9a06g032_div_determine_rate()
1001 		 clk->min, DIV_ROUND_UP(req->best_parent_rate, clk->min),  in r9a06g032_div_determine_rate()
1002 		 clk->max, DIV_ROUND_UP(req->best_parent_rate, clk->max));  in r9a06g032_div_determine_rate()
1004 	div = r9a06g032_div_clamp_div(clk, req->rate, req->best_parent_rate);  in r9a06g032_div_determine_rate()
1007 	 * that is 16 times the baud rate -- and that is wildly outside the  in r9a06g032_div_determine_rate()
1014 	if (clk->index == R9A06G032_DIV_UART ||  in r9a06g032_div_determine_rate()
1015 	    clk->index == R9A06G032_DIV_P2_PG) {  in r9a06g032_div_determine_rate()
1017 		req->rate = clk_get_rate(hw->clk);  in r9a06g032_div_determine_rate()
1020 	req->rate = DIV_ROUND_UP(req->best_parent_rate, div);  in r9a06g032_div_determine_rate()
1021 	pr_devel("%s %pC %ld / %u = %ld\n", __func__, hw->clk,  in r9a06g032_div_determine_rate()
1022 		 req->best_parent_rate, div, req->rate);  in r9a06g032_div_determine_rate()
1033 	u32 __iomem *reg = clk->clocks->reg + (4 * clk->reg);  in r9a06g032_div_set_rate()
1035 	pr_devel("%s %pC rate %ld parent %ld div %d\n", __func__, hw->clk,  in r9a06g032_div_set_rate()
1070 	init.name = desc->name;  in r9a06g032_register_div()
1076 	div->clocks = clocks;  in r9a06g032_register_div()
1077 	div->index = desc->index;  in r9a06g032_register_div()
1078 	div->reg = desc->div.reg;  in r9a06g032_register_div()
1079 	div->hw.init = &init;  in r9a06g032_register_div()
1080 	div->min = desc->div.min;  in r9a06g032_register_div()
1081 	div->max = desc->div.max;  in r9a06g032_register_div()
1083 	for (i = 0; i < ARRAY_SIZE(div->table) &&  in r9a06g032_register_div()
1084 	     i < ARRAY_SIZE(desc->div.table) && desc->div.table[i]; i++) {  in r9a06g032_register_div()
1085 		div->table[div->table_size++] = desc->div.table[i];  in r9a06g032_register_div()
1088 	clk = clk_register(NULL, &div->hw);  in r9a06g032_register_div()
1097  * This clock provider handles the case of the R9A06G032 where you have
1099  * each of the clock source - the used clock source (for all sub clocks)
1101  * That single bit affects all sub-clocks, and therefore needs to change the
1122 	return clk_rdesc_get(set->clocks, set->selector);  in r9a06g032_clk_mux_get_parent()
1130 	clk_rdesc_set(set->clocks, set->selector, !!index);  in r9a06g032_clk_mux_set_parent()
1159 	init.name = desc->name;  in r9a06g032_register_bitsel()
1165 	g->clocks = clocks;  in r9a06g032_register_bitsel()
1166 	g->index = desc->index;  in r9a06g032_register_bitsel()
1167 	g->selector = desc->dual.sel;  in r9a06g032_register_bitsel()
1168 	g->hw.init = &init;  in r9a06g032_register_bitsel()
1170 	clk = clk_register(NULL, &g->hw);  in r9a06g032_register_bitsel()
1192 	u8 sel_bit = clk_rdesc_get(g->clocks, g->selector);  in r9a06g032_clk_dualgate_setenable()
1195 	r9a06g032_clk_gate_set(g->clocks, &g->gate[!sel_bit], 0);  in r9a06g032_clk_dualgate_setenable()
1196 	r9a06g032_clk_gate_set(g->clocks, &g->gate[sel_bit], enable);  in r9a06g032_clk_dualgate_setenable()
1220 	u8 sel_bit = clk_rdesc_get(g->clocks, g->selector);  in r9a06g032_clk_dualgate_is_enabled()
1222 	return clk_rdesc_get(g->clocks, g->gate[sel_bit].gate);  in r9a06g032_clk_dualgate_is_enabled()
1245 	g->clocks = clocks;  in r9a06g032_register_dualgate()
1246 	g->index = desc->index;  in r9a06g032_register_dualgate()
1247 	g->selector = sel;  in r9a06g032_register_dualgate()
1248 	g->gate[0].gate = desc->dual.g1;  in r9a06g032_register_dualgate()
1249 	g->gate[0].reset = desc->dual.r1;  in r9a06g032_register_dualgate()
1250 	g->gate[1].gate = desc->dual.g2;  in r9a06g032_register_dualgate()
1251 	g->gate[1].reset = desc->dual.r2;  in r9a06g032_register_dualgate()
1253 	init.name = desc->name;  in r9a06g032_register_dualgate()
1258 	g->hw.init = &init;  in r9a06g032_register_dualgate()
1264 	if (r9a06g032_clk_dualgate_is_enabled(&g->hw)) {  in r9a06g032_register_dualgate()
1266 		pr_debug("%s was enabled, making read-only\n", desc->name);  in r9a06g032_register_dualgate()
1269 	clk = clk_register(NULL, &g->hw);  in r9a06g032_register_dualgate()
1284 	writel(R9A06G032_SYSCTRL_SWRST, sysctrl_priv->reg + R9A06G032_SYSCTRL_RSTCTRL);  in r9a06g032_restart_handler()
1293 	for_each_compatible_node(usbf_np, NULL, "renesas,rzn1-usbf") {  in r9a06g032_init_h2mode()
1298 	usb = readl(clocks->reg + R9A06G032_SYSCTRL_USB);  in r9a06g032_init_h2mode()
1307 	writel(usb, clocks->reg + R9A06G032_SYSCTRL_USB);  in r9a06g032_init_h2mode()
1312 	struct device *dev = &pdev->dev;  in r9a06g032_clocks_probe()
1313 	struct device_node *np = dev->of_node;  in r9a06g032_clocks_probe()
1325 		return -ENOMEM;  in r9a06g032_clocks_probe()
1327 	spin_lock_init(&clocks->lock);  in r9a06g032_clocks_probe()
1329 	clocks->data.clks = clks;  in r9a06g032_clocks_probe()
1330 	clocks->data.clk_num = R9A06G032_CLOCK_COUNT;  in r9a06g032_clocks_probe()
1336 	clocks->reg = of_iomap(np, 0);  in r9a06g032_clocks_probe()
1337 	if (WARN_ON(!clocks->reg))  in r9a06g032_clocks_probe()
1338 		return -ENOMEM;  in r9a06g032_clocks_probe()
1344 	       clocks->reg + R9A06G032_SYSCTRL_RSTCTRL);  in r9a06g032_clocks_probe()
1347 	       clocks->reg + R9A06G032_SYSCTRL_RSTEN);  in r9a06g032_clocks_probe()
1356 		const char *parent_name = d->source ?  in r9a06g032_clocks_probe()
1357 			__clk_get_name(clocks->data.clks[d->source - 1]) :  in r9a06g032_clocks_probe()
1361 		switch (d->type) {  in r9a06g032_clocks_probe()
1363 			clk = clk_register_fixed_factor(NULL, d->name,  in r9a06g032_clocks_probe()
1365 							d->ffc.mul,  in r9a06g032_clocks_probe()
1366 							d->ffc.div);  in r9a06g032_clocks_probe()
1376 			uart_group_sel[d->dual.group] = d->dual.sel;  in r9a06g032_clocks_probe()
1382 							  uart_group_sel[d->dual.group]);  in r9a06g032_clocks_probe()
1385 		clocks->data.clks[d->index] = clk;  in r9a06g032_clocks_probe()
1387 	error = of_clk_add_provider(np, of_clk_src_onecell_get, &clocks->data);  in r9a06g032_clocks_probe()
1410 	{ .compatible = "renesas,r9a06g032-sysctrl" },
1416 		.name	= "renesas,r9a06g032-sysctrl",