1 // SPDX-License-Identifier: GPL-2.0-only
3  * Cortina Systems Gemini SATA bridge add-on to Faraday FTIDE010
25  * struct sata_gemini - a state container for a Gemini SATA bridge
30  * @sata_bridge: if the device enables the SATA bridge
53  * Bits 26:24 are "IDE IO Select", which decides what SATA
55  * controllers in the Gemini. We can connect the two IDE blocks
56  * to one SATA adapter each, both acting as master, or one IDE
57  * blocks to two SATA adapters so the IDE block can act in a
61  * pins (not SATA pins) if (and only if) these are muxed in.
63  * 111-100 - Reserved
64  * Mode 0: 000 - ata0 master <-> sata0
65  *               ata1 master <-> sata1
67  * Mode 1: 001 - ata0 master <-> sata0
68  *               ata1 master <-> sata1
70  * Mode 2: 010 - ata1 master <-> sata1
71  *               ata1 slave  <-> sata0
74  * Mode 3: 011 - ata0 master <-> sata0
75  *               ata1 slave  <-> sata1
87  * Registers directly controlling the PATA<->SATA adapters
112  * There is only ever one instance of this bridge on a system,
122 	return ERR_PTR(-EPROBE_DEFER);  in gemini_sata_bridge_get()
128 	if (!sg->sata_bridge)  in gemini_sata_bridge_enabled()
132 	 * actually not connected to any SATA bridge.  in gemini_sata_bridge_enabled()
134 	if ((sg->muxmode == GEMINI_MUXMODE_2) &&  in gemini_sata_bridge_enabled()
137 	if ((sg->muxmode == GEMINI_MUXMODE_3) &&  in gemini_sata_bridge_enabled()
147 	return sg->muxmode;  in gemini_sata_get_muxmode()
152 				    unsigned int bridge)  in gemini_sata_setup_bridge()  argument
158 	if (bridge == 0) {  in gemini_sata_setup_bridge()
161 		if (sg->muxmode == GEMINI_MUXMODE_2)  in gemini_sata_setup_bridge()
163 		writel(val, sg->base + GEMINI_SATA0_CTRL);  in gemini_sata_setup_bridge()
167 		if (sg->muxmode == GEMINI_MUXMODE_3)  in gemini_sata_setup_bridge()
169 		writel(val, sg->base + GEMINI_SATA1_CTRL);  in gemini_sata_setup_bridge()
179 		if (bridge == 0)  in gemini_sata_setup_bridge()
180 			val = readl(sg->base + GEMINI_SATA0_STATUS);  in gemini_sata_setup_bridge()
182 			val = readl(sg->base + GEMINI_SATA1_STATUS);  in gemini_sata_setup_bridge()
189 	dev_info(sg->dev, "SATA%d PHY %s\n", bridge,  in gemini_sata_setup_bridge()
192 	return bridge_online ? 0: -ENODEV;  in gemini_sata_setup_bridge()
195 int gemini_sata_start_bridge(struct sata_gemini *sg, unsigned int bridge)  in gemini_sata_start_bridge()  argument
200 	if (bridge == 0)  in gemini_sata_start_bridge()
201 		pclk = sg->sata0_pclk;  in gemini_sata_start_bridge()
203 		pclk = sg->sata1_pclk;  in gemini_sata_start_bridge()
207 	/* Do not keep clocking a bridge that is not online */  in gemini_sata_start_bridge()
208 	ret = gemini_sata_setup_bridge(sg, bridge);  in gemini_sata_start_bridge()
216 void gemini_sata_stop_bridge(struct sata_gemini *sg, unsigned int bridge)  in gemini_sata_stop_bridge()  argument
218 	if (bridge == 0)  in gemini_sata_stop_bridge()
219 		clk_disable(sg->sata0_pclk);  in gemini_sata_stop_bridge()
220 	else if (bridge == 1)  in gemini_sata_stop_bridge()
221 		clk_disable(sg->sata1_pclk);  in gemini_sata_stop_bridge()
226 			     unsigned int bridge)  in gemini_sata_reset_bridge()  argument
228 	if (bridge == 0)  in gemini_sata_reset_bridge()
229 		reset_control_reset(sg->sata0_reset);  in gemini_sata_reset_bridge()
231 		reset_control_reset(sg->sata1_reset);  in gemini_sata_reset_bridge()
233 	return gemini_sata_setup_bridge(sg, bridge);  in gemini_sata_reset_bridge()
239 	struct device *dev = sg->dev;  in gemini_sata_bridge_init()
243 	sg->sata0_pclk = devm_clk_get(dev, "SATA0_PCLK");  in gemini_sata_bridge_init()
244 	if (IS_ERR(sg->sata0_pclk)) {  in gemini_sata_bridge_init()
246 		return -ENODEV;  in gemini_sata_bridge_init()
248 	sg->sata1_pclk = devm_clk_get(dev, "SATA1_PCLK");  in gemini_sata_bridge_init()
249 	if (IS_ERR(sg->sata1_pclk)) {  in gemini_sata_bridge_init()
251 		return -ENODEV;  in gemini_sata_bridge_init()
254 	ret = clk_prepare_enable(sg->sata0_pclk);  in gemini_sata_bridge_init()
256 		dev_err(dev, "failed to enable SATA0 PCLK\n");  in gemini_sata_bridge_init()
259 	ret = clk_prepare_enable(sg->sata1_pclk);  in gemini_sata_bridge_init()
261 		dev_err(dev, "failed to enable SATA1 PCLK\n");  in gemini_sata_bridge_init()
262 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
266 	sg->sata0_reset = devm_reset_control_get_exclusive(dev, "sata0");  in gemini_sata_bridge_init()
267 	if (IS_ERR(sg->sata0_reset)) {  in gemini_sata_bridge_init()
269 		clk_disable_unprepare(sg->sata1_pclk);  in gemini_sata_bridge_init()
270 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
271 		return PTR_ERR(sg->sata0_reset);  in gemini_sata_bridge_init()
273 	sg->sata1_reset = devm_reset_control_get_exclusive(dev, "sata1");  in gemini_sata_bridge_init()
274 	if (IS_ERR(sg->sata1_reset)) {  in gemini_sata_bridge_init()
276 		clk_disable_unprepare(sg->sata1_pclk);  in gemini_sata_bridge_init()
277 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
278 		return PTR_ERR(sg->sata1_reset);  in gemini_sata_bridge_init()
281 	sata_id = readl(sg->base + GEMINI_SATA_ID);  in gemini_sata_bridge_init()
282 	sata_phy_id = readl(sg->base + GEMINI_SATA_PHY_ID);  in gemini_sata_bridge_init()
283 	sg->sata_bridge = true;  in gemini_sata_bridge_init()
284 	clk_disable(sg->sata0_pclk);  in gemini_sata_bridge_init()
285 	clk_disable(sg->sata1_pclk);  in gemini_sata_bridge_init()
287 	dev_info(dev, "SATA ID %08x, PHY ID: %08x\n", sata_id, sata_phy_id);  in gemini_sata_bridge_init()
317 	struct device *dev = &pdev->dev;  in gemini_sata_probe()
318 	struct device_node *np = dev->of_node;  in gemini_sata_probe()
328 		return -ENOMEM;  in gemini_sata_probe()
329 	sg->dev = dev;  in gemini_sata_probe()
331 	sg->base = devm_platform_ioremap_resource(pdev, 0);  in gemini_sata_probe()
332 	if (IS_ERR(sg->base))  in gemini_sata_probe()
333 		return PTR_ERR(sg->base);  in gemini_sata_probe()
341 	/* Set up the SATA bridge if need be */  in gemini_sata_probe()
342 	if (of_property_read_bool(np, "cortina,gemini-enable-sata-bridge")) {  in gemini_sata_probe()
348 	if (of_property_read_bool(np, "cortina,gemini-enable-ide-pins"))  in gemini_sata_probe()
349 		sg->ide_pins = true;  in gemini_sata_probe()
351 	if (!sg->sata_bridge && !sg->ide_pins) {  in gemini_sata_probe()
352 		dev_err(dev, "neither SATA bridge or IDE output enabled\n");  in gemini_sata_probe()
353 		ret = -EINVAL;  in gemini_sata_probe()
357 	ret = of_property_read_u32(np, "cortina,gemini-ata-muxmode", &muxmode);  in gemini_sata_probe()
364 		ret = -EINVAL;  in gemini_sata_probe()
367 	sg->muxmode = muxmode;  in gemini_sata_probe()
374 		ret = -ENODEV;  in gemini_sata_probe()
383 	if (sg->ide_pins) {  in gemini_sata_probe()
389 	dev_info(dev, "set up the Gemini IDE/SATA nexus\n");  in gemini_sata_probe()
396 	if (sg->sata_bridge) {  in gemini_sata_probe()
397 		clk_unprepare(sg->sata1_pclk);  in gemini_sata_probe()
398 		clk_unprepare(sg->sata0_pclk);  in gemini_sata_probe()
407 	if (sg->sata_bridge) {  in gemini_sata_remove()
408 		clk_unprepare(sg->sata1_pclk);  in gemini_sata_remove()
409 		clk_unprepare(sg->sata0_pclk);  in gemini_sata_remove()
417 	{ .compatible = "cortina,gemini-sata-bridge", },