1 // SPDX-License-Identifier: GPL-2.0-only
3  * Cortina Systems Gemini SATA bridge add-on to Faraday FTIDE010
23  * struct sata_gemini - a state container for a Gemini SATA bridge
28  * @sata_bridge: if the device enables the SATA bridge
43 #define GEMINI_GLOBAL_MISC_CTRL		0x30
47  * Bits 26:24 are "IDE IO Select", which decides what SATA
50  * to one SATA adapter each, both acting as master, or one IDE
51  * blocks to two SATA adapters so the IDE block can act in a
55  * pins (not SATA pins) if (and only if) these are muxed in.
57  * 111-100 - Reserved
58  * Mode 0: 000 - ata0 master <-> sata0
59  *               ata1 master <-> sata1
61  * Mode 1: 001 - ata0 master <-> sata0
62  *               ata1 master <-> sata1
64  * Mode 2: 010 - ata1 master <-> sata1
65  *               ata1 slave  <-> sata0
68  * Mode 3: 011 - ata0 master <-> sata0
69  *               ata1 slave  <-> sata1
74 #define GEMINI_IDE_IOMUX_MODE0			(0 << 24)
81  * Registers directly controlling the PATA<->SATA adapters
83 #define GEMINI_SATA_ID				0x00
84 #define GEMINI_SATA_PHY_ID			0x04
85 #define GEMINI_SATA0_STATUS			0x08
86 #define GEMINI_SATA1_STATUS			0x0c
87 #define GEMINI_SATA0_CTRL			0x18
88 #define GEMINI_SATA1_CTRL			0x1c
92 #define GEMINI_SATA_STATUS_PHY_READY		BIT(0)
103 #define GEMINI_SATA_CTRL_EN			BIT(0)
116 	return ERR_PTR(-EPROBE_DEFER);  in gemini_sata_bridge_get()
122 	if (!sg->sata_bridge)  in gemini_sata_bridge_enabled()
126 	 * actually not connected to any SATA bridge.  in gemini_sata_bridge_enabled()
128 	if ((sg->muxmode == GEMINI_MUXMODE_2) &&  in gemini_sata_bridge_enabled()
131 	if ((sg->muxmode == GEMINI_MUXMODE_3) &&  in gemini_sata_bridge_enabled()
141 	return sg->muxmode;  in gemini_sata_get_muxmode()
152 	if (bridge == 0) {  in gemini_sata_setup_bridge()
155 		if (sg->muxmode == GEMINI_MUXMODE_2)  in gemini_sata_setup_bridge()
157 		writel(val, sg->base + GEMINI_SATA0_CTRL);  in gemini_sata_setup_bridge()
161 		if (sg->muxmode == GEMINI_MUXMODE_3)  in gemini_sata_setup_bridge()
163 		writel(val, sg->base + GEMINI_SATA1_CTRL);  in gemini_sata_setup_bridge()
173 		if (bridge == 0)  in gemini_sata_setup_bridge()
174 			val = readl(sg->base + GEMINI_SATA0_STATUS);  in gemini_sata_setup_bridge()
176 			val = readl(sg->base + GEMINI_SATA1_STATUS);  in gemini_sata_setup_bridge()
183 	dev_info(sg->dev, "SATA%d PHY %s\n", bridge,  in gemini_sata_setup_bridge()
186 	return bridge_online ? 0: -ENODEV;  in gemini_sata_setup_bridge()
194 	if (bridge == 0)  in gemini_sata_start_bridge()
195 		pclk = sg->sata0_pclk;  in gemini_sata_start_bridge()
197 		pclk = sg->sata1_pclk;  in gemini_sata_start_bridge()
215 	if (bridge == 0)  in gemini_sata_stop_bridge()
216 		clk_disable(sg->sata0_pclk);  in gemini_sata_stop_bridge()
218 		clk_disable(sg->sata1_pclk);  in gemini_sata_stop_bridge()
224 	struct device *dev = sg->dev;  in gemini_sata_bridge_init()
228 	sg->sata0_pclk = devm_clk_get(dev, "SATA0_PCLK");  in gemini_sata_bridge_init()
229 	if (IS_ERR(sg->sata0_pclk)) {  in gemini_sata_bridge_init()
231 		return -ENODEV;  in gemini_sata_bridge_init()
233 	sg->sata1_pclk = devm_clk_get(dev, "SATA1_PCLK");  in gemini_sata_bridge_init()
234 	if (IS_ERR(sg->sata1_pclk)) {  in gemini_sata_bridge_init()
236 		return -ENODEV;  in gemini_sata_bridge_init()
239 	ret = clk_prepare_enable(sg->sata0_pclk);  in gemini_sata_bridge_init()
244 	ret = clk_prepare_enable(sg->sata1_pclk);  in gemini_sata_bridge_init()
247 		clk_disable_unprepare(sg->sata0_pclk);  in gemini_sata_bridge_init()
251 	sata_id = readl(sg->base + GEMINI_SATA_ID);  in gemini_sata_bridge_init()
252 	sata_phy_id = readl(sg->base + GEMINI_SATA_PHY_ID);  in gemini_sata_bridge_init()
253 	sg->sata_bridge = true;  in gemini_sata_bridge_init()
254 	clk_disable(sg->sata0_pclk);  in gemini_sata_bridge_init()
255 	clk_disable(sg->sata1_pclk);  in gemini_sata_bridge_init()
257 	dev_info(dev, "SATA ID %08x, PHY ID: %08x\n", sata_id, sata_phy_id);  in gemini_sata_bridge_init()
259 	return 0;  in gemini_sata_bridge_init()
282 	return 0;  in gemini_setup_ide_pins()
287 	struct device *dev = &pdev->dev;  in gemini_sata_probe()
288 	struct device_node *np = dev->of_node;  in gemini_sata_probe()
298 		return -ENOMEM;  in gemini_sata_probe()
299 	sg->dev = dev;  in gemini_sata_probe()
301 	sg->base = devm_platform_ioremap_resource(pdev, 0);  in gemini_sata_probe()
302 	if (IS_ERR(sg->base))  in gemini_sata_probe()
303 		return PTR_ERR(sg->base);  in gemini_sata_probe()
311 	/* Set up the SATA bridge if need be */  in gemini_sata_probe()
312 	if (of_property_read_bool(np, "cortina,gemini-enable-sata-bridge")) {  in gemini_sata_probe()
318 	if (of_property_read_bool(np, "cortina,gemini-enable-ide-pins"))  in gemini_sata_probe()
319 		sg->ide_pins = true;  in gemini_sata_probe()
321 	if (!sg->sata_bridge && !sg->ide_pins) {  in gemini_sata_probe()
322 		dev_err(dev, "neither SATA bridge or IDE output enabled\n");  in gemini_sata_probe()
323 		ret = -EINVAL;  in gemini_sata_probe()
327 	ret = of_property_read_u32(np, "cortina,gemini-ata-muxmode", &muxmode);  in gemini_sata_probe()
334 		ret = -EINVAL;  in gemini_sata_probe()
337 	sg->muxmode = muxmode;  in gemini_sata_probe()
344 		ret = -ENODEV;  in gemini_sata_probe()
353 	if (sg->ide_pins) {  in gemini_sata_probe()
359 	dev_info(dev, "set up the Gemini IDE/SATA nexus\n");  in gemini_sata_probe()
363 	return 0;  in gemini_sata_probe()
366 	if (sg->sata_bridge) {  in gemini_sata_probe()
367 		clk_unprepare(sg->sata1_pclk);  in gemini_sata_probe()
368 		clk_unprepare(sg->sata0_pclk);  in gemini_sata_probe()
377 	if (sg->sata_bridge) {  in gemini_sata_remove()
378 		clk_unprepare(sg->sata1_pclk);  in gemini_sata_remove()
379 		clk_unprepare(sg->sata0_pclk);  in gemini_sata_remove()
385 	{ .compatible = "cortina,gemini-sata-bridge", },
400 MODULE_DESCRIPTION("low level driver for Cortina Systems Gemini SATA bridge");