1 // SPDX-License-Identifier: GPL-2.0
18 #include <dt-bindings/soc/samsung,exynos-usi.h>
55 	enum exynos_usi_ver ver;	/* USI IP-core version */
68 	size_t mode;			/* current USI SW_CONF mode index */  member
79 	const char *name;		/* mode name */
80 	unsigned int val;		/* mode register value */
122 		.compatible = "samsung,exynos850-usi",
125 		.compatible = "samsung,exynos8895-usi",
133  * exynos_usi_set_sw_conf - Set USI block configuration mode
135  * @mode: Mode index
137  * Select underlying serial protocol (UART/SPI/I2C) in USI IP-core.
141 static int exynos_usi_set_sw_conf(struct exynos_usi *usi, size_t mode)  in exynos_usi_set_sw_conf()  argument
146 	if (mode < usi->data->min_mode || mode > usi->data->max_mode)  in exynos_usi_set_sw_conf()
147 		return -EINVAL;  in exynos_usi_set_sw_conf()
149 	val = exynos_usi_modes[usi->data->ver][mode].val;  in exynos_usi_set_sw_conf()
150 	ret = regmap_update_bits(usi->sysreg, usi->sw_conf,  in exynos_usi_set_sw_conf()
151 				 usi->data->sw_conf_mask, val);  in exynos_usi_set_sw_conf()
155 	usi->mode = mode;  in exynos_usi_set_sw_conf()
156 	dev_dbg(usi->dev, "protocol: %s\n",  in exynos_usi_set_sw_conf()
157 		exynos_usi_modes[usi->data->ver][usi->mode].name);  in exynos_usi_set_sw_conf()
163  * exynos_usi_enable - Initialize USI block
166  * USI IP-core start state is "reset" (on startup and after CPU resume). This
178 	ret = clk_bulk_prepare_enable(usi->data->num_clks, usi->clks);  in exynos_usi_enable()
183 	val = readl(usi->regs + USI_CON);  in exynos_usi_enable()
185 	writel(val, usi->regs + USI_CON);  in exynos_usi_enable()
189 	if (usi->clkreq_on) {  in exynos_usi_enable()
190 		val = readl(usi->regs + USI_OPTION);  in exynos_usi_enable()
193 		writel(val, usi->regs + USI_OPTION);  in exynos_usi_enable()
196 	clk_bulk_disable_unprepare(usi->data->num_clks, usi->clks);  in exynos_usi_enable()
205 	ret = exynos_usi_set_sw_conf(usi, usi->mode);  in exynos_usi_configure()
209 	if (usi->data->ver == USI_VER1)  in exynos_usi_configure()
210 		ret = clk_bulk_prepare_enable(usi->data->num_clks,  in exynos_usi_configure()
211 					      usi->clks);  in exynos_usi_configure()
212 	else if (usi->data->ver == USI_VER2)  in exynos_usi_configure()
224 	if (usi->data->ver == USI_VER1) {  in exynos_usi_unconfigure()
225 		clk_bulk_disable_unprepare(usi->data->num_clks, usi->clks);  in exynos_usi_unconfigure()
229 	ret = clk_bulk_prepare_enable(usi->data->num_clks, usi->clks);  in exynos_usi_unconfigure()
234 	val = readl(usi->regs + USI_OPTION);  in exynos_usi_unconfigure()
237 	writel(val, usi->regs + USI_OPTION);  in exynos_usi_unconfigure()
240 	val = readl(usi->regs + USI_CON);  in exynos_usi_unconfigure()
242 	writel(val, usi->regs + USI_CON);  in exynos_usi_unconfigure()
244 	clk_bulk_disable_unprepare(usi->data->num_clks, usi->clks);  in exynos_usi_unconfigure()
250 	u32 mode;  in exynos_usi_parse_dt()  local
252 	ret = of_property_read_u32(np, "samsung,mode", &mode);  in exynos_usi_parse_dt()
255 	if (mode < usi->data->min_mode || mode > usi->data->max_mode)  in exynos_usi_parse_dt()
256 		return -EINVAL;  in exynos_usi_parse_dt()
257 	usi->mode = mode;  in exynos_usi_parse_dt()
259 	usi->sysreg = syscon_regmap_lookup_by_phandle_args(np, "samsung,sysreg",  in exynos_usi_parse_dt()
260 							   1, &usi->sw_conf);  in exynos_usi_parse_dt()
261 	if (IS_ERR(usi->sysreg))  in exynos_usi_parse_dt()
262 		return PTR_ERR(usi->sysreg);  in exynos_usi_parse_dt()
264 	usi->clkreq_on = of_property_read_bool(np, "samsung,clkreq-on");  in exynos_usi_parse_dt()
271 	const size_t num = usi->data->num_clks;  in exynos_usi_get_clocks()
272 	struct device *dev = usi->dev;  in exynos_usi_get_clocks()
278 	usi->clks = devm_kcalloc(dev, num, sizeof(*usi->clks), GFP_KERNEL);  in exynos_usi_get_clocks()
279 	if (!usi->clks)  in exynos_usi_get_clocks()
280 		return -ENOMEM;  in exynos_usi_get_clocks()
283 		usi->clks[i].id = usi->data->clk_names[i];  in exynos_usi_get_clocks()
285 	return devm_clk_bulk_get(dev, num, usi->clks);  in exynos_usi_get_clocks()
290 	struct device *dev = &pdev->dev;  in exynos_usi_probe()
291 	struct device_node *np = dev->of_node;  in exynos_usi_probe()
297 		return -ENOMEM;  in exynos_usi_probe()
299 	usi->dev = dev;  in exynos_usi_probe()
302 	usi->data = of_device_get_match_data(dev);  in exynos_usi_probe()
303 	if (!usi->data)  in exynos_usi_probe()
304 		return -EINVAL;  in exynos_usi_probe()
314 	if (usi->data->ver == USI_VER2) {  in exynos_usi_probe()
315 		usi->regs = devm_platform_ioremap_resource(pdev, 0);  in exynos_usi_probe()
316 		if (IS_ERR(usi->regs))  in exynos_usi_probe()
317 			return PTR_ERR(usi->regs);  in exynos_usi_probe()
324 	ret = devm_add_action_or_reset(&pdev->dev, exynos_usi_unconfigure, usi);  in exynos_usi_probe()
345 		.name		= "exynos-usi",