1 // SPDX-License-Identifier: GPL-2.0-only
3  * Cortina Systems Gemini SATA bridge add-on to Faraday FTIDE010
24  * struct sata_gemini - a state container for a Gemini SATA bridge
29  * @sata_bridge: if the device enables the SATA bridge
62  * 111-100 - Reserved
63  * Mode 0: 000 - ata0 master <-> sata0
64  *               ata1 master <-> sata1
66  * Mode 1: 001 - ata0 master <-> sata0
67  *               ata1 master <-> sata1
69  * Mode 2: 010 - ata1 master <-> sata1
70  *               ata1 slave  <-> sata0
73  * Mode 3: 011 - ata0 master <-> sata0
74  *               ata1 slave  <-> sata1
86  * Registers directly controlling the PATA<->SATA adapters
111  * There is only ever one instance of this bridge on a system,
121 	return ERR_PTR(-EPROBE_DEFER);  in gemini_sata_bridge_get()
127 	if (!sg->sata_bridge)  in gemini_sata_bridge_enabled()
131 	 * actually not connected to any SATA bridge.  in gemini_sata_bridge_enabled()
133 	if ((sg->muxmode == GEMINI_MUXMODE_2) &&  in gemini_sata_bridge_enabled()
136 	if ((sg->muxmode == GEMINI_MUXMODE_3) &&  in gemini_sata_bridge_enabled()
146 	return sg->muxmode;  in gemini_sata_get_muxmode()
151 				    unsigned int bridge)  in gemini_sata_setup_bridge()  argument
157 	if (bridge == 0) {  in gemini_sata_setup_bridge()
160 		if (sg->muxmode == GEMINI_MUXMODE_2)  in gemini_sata_setup_bridge()
162 		writel(val, sg->base + GEMINI_SATA0_CTRL);  in gemini_sata_setup_bridge()
166 		if (sg->muxmode == GEMINI_MUXMODE_3)  in gemini_sata_setup_bridge()
168 		writel(val, sg->base + GEMINI_SATA1_CTRL);  in gemini_sata_setup_bridge()
178 		if (bridge == 0)  in gemini_sata_setup_bridge()
179 			val = readl(sg->base + GEMINI_SATA0_STATUS);  in gemini_sata_setup_bridge()
181 			val = readl(sg->base + GEMINI_SATA1_STATUS);  in gemini_sata_setup_bridge()
188 	dev_info(sg->dev, "SATA%d PHY %s\n", bridge,  in gemini_sata_setup_bridge()
191 	return bridge_online ? 0: -ENODEV;  in gemini_sata_setup_bridge()
194 int gemini_sata_start_bridge(struct sata_gemini *sg, unsigned int bridge)  in gemini_sata_start_bridge()  argument
199 	if (bridge == 0)  in gemini_sata_start_bridge()
200 		pclk = sg->sata0_pclk;  in gemini_sata_start_bridge()
202 		pclk = sg->sata1_pclk;  in gemini_sata_start_bridge()
209 	/* Do not keep clocking a bridge that is not online */  in gemini_sata_start_bridge()
210 	ret = gemini_sata_setup_bridge(sg, bridge);  in gemini_sata_start_bridge()
218 void gemini_sata_stop_bridge(struct sata_gemini *sg, unsigned int bridge)  in gemini_sata_stop_bridge()  argument
220 	if (bridge == 0)  in gemini_sata_stop_bridge()
221 		clk_disable(sg->sata0_pclk);  in gemini_sata_stop_bridge()
222 	else if (bridge == 1)  in gemini_sata_stop_bridge()
223 		clk_disable(sg->sata1_pclk);  in gemini_sata_stop_bridge()
228 			     unsigned int bridge)  in gemini_sata_reset_bridge()  argument
230 	if (bridge == 0)  in gemini_sata_reset_bridge()
231 		reset_control_reset(sg->sata0_reset);  in gemini_sata_reset_bridge()
233 		reset_control_reset(sg->sata1_reset);  in gemini_sata_reset_bridge()
235 	return gemini_sata_setup_bridge(sg, bridge);  in gemini_sata_reset_bridge()
241 	struct device *dev = sg->dev;  in gemini_sata_bridge_init()
245 	sg->sata0_pclk = devm_clk_get(dev, "SATA0_PCLK");  in gemini_sata_bridge_init()
246 	if (IS_ERR(sg->sata0_pclk)) {  in gemini_sata_bridge_init()
248 		return -ENODEV;  in gemini_sata_bridge_init()
250 	sg->sata1_pclk = devm_clk_get(dev, "SATA1_PCLK");  in gemini_sata_bridge_init()
251 	if (IS_ERR(sg->sata1_pclk)) {  in gemini_sata_bridge_init()
253 		return -ENODEV;  in gemini_sata_bridge_init()
256 	ret = clk_prepare_enable(sg->sata0_pclk);  in gemini_sata_bridge_init()
258 		dev_err(dev, "failed to enable SATA0 PCLK\n");  in gemini_sata_bridge_init()
261 	ret = clk_prepare_enable(sg->sata1_pclk);  in gemini_sata_bridge_init()
263 		dev_err(dev, "failed to enable SATA1 PCLK\n");  in gemini_sata_bridge_init()
264 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
268 	sg->sata0_reset = devm_reset_control_get_exclusive(dev, "sata0");  in gemini_sata_bridge_init()
269 	if (IS_ERR(sg->sata0_reset)) {  in gemini_sata_bridge_init()
271 		clk_disable_unprepare(sg->sata1_pclk);  in gemini_sata_bridge_init()
272 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
273 		return PTR_ERR(sg->sata0_reset);  in gemini_sata_bridge_init()
275 	sg->sata1_reset = devm_reset_control_get_exclusive(dev, "sata1");  in gemini_sata_bridge_init()
276 	if (IS_ERR(sg->sata1_reset)) {  in gemini_sata_bridge_init()
278 		clk_disable_unprepare(sg->sata1_pclk);  in gemini_sata_bridge_init()
279 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
280 		return PTR_ERR(sg->sata1_reset);  in gemini_sata_bridge_init()
283 	sata_id = readl(sg->base + GEMINI_SATA_ID);  in gemini_sata_bridge_init()
284 	sata_phy_id = readl(sg->base + GEMINI_SATA_PHY_ID);  in gemini_sata_bridge_init()
285 	sg->sata_bridge = true;  in gemini_sata_bridge_init()
286 	clk_disable(sg->sata0_pclk);  in gemini_sata_bridge_init()
287 	clk_disable(sg->sata1_pclk);  in gemini_sata_bridge_init()
319 	struct device *dev = &pdev->dev;  in gemini_sata_probe()
320 	struct device_node *np = dev->of_node;  in gemini_sata_probe()
330 		return -ENOMEM;  in gemini_sata_probe()
331 	sg->dev = dev;  in gemini_sata_probe()
333 	sg->base = devm_platform_ioremap_resource(pdev, 0);  in gemini_sata_probe()
334 	if (IS_ERR(sg->base))  in gemini_sata_probe()
335 		return PTR_ERR(sg->base);  in gemini_sata_probe()
343 	/* Set up the SATA bridge if need be */  in gemini_sata_probe()
344 	if (of_property_read_bool(np, "cortina,gemini-enable-sata-bridge")) {  in gemini_sata_probe()
350 	if (of_property_read_bool(np, "cortina,gemini-enable-ide-pins"))  in gemini_sata_probe()
351 		sg->ide_pins = true;  in gemini_sata_probe()
353 	if (!sg->sata_bridge && !sg->ide_pins) {  in gemini_sata_probe()
354 		dev_err(dev, "neither SATA bridge or IDE output enabled\n");  in gemini_sata_probe()
355 		ret = -EINVAL;  in gemini_sata_probe()
359 	ret = of_property_read_u32(np, "cortina,gemini-ata-muxmode", &muxmode);  in gemini_sata_probe()
366 		ret = -EINVAL;  in gemini_sata_probe()
369 	sg->muxmode = muxmode;  in gemini_sata_probe()
376 		ret = -ENODEV;  in gemini_sata_probe()
385 	if (sg->ide_pins) {  in gemini_sata_probe()
398 	if (sg->sata_bridge) {  in gemini_sata_probe()
399 		clk_unprepare(sg->sata1_pclk);  in gemini_sata_probe()
400 		clk_unprepare(sg->sata0_pclk);  in gemini_sata_probe()
409 	if (sg->sata_bridge) {  in gemini_sata_remove()
410 		clk_unprepare(sg->sata1_pclk);  in gemini_sata_remove()
411 		clk_unprepare(sg->sata0_pclk);  in gemini_sata_remove()
417 	{ .compatible = "cortina,gemini-sata-bridge", },
432 MODULE_DESCRIPTION("low level driver for Cortina Systems Gemini SATA bridge");