1 // SPDX-License-Identifier: GPL-2.0
5  *  Copyright (C) 2013-2016 Altera Corporation, All Rights Reserved.
8  *   fpga: altera-hps2fpga: fix HPS2FPGA bridge visibility to L3 masters
9  *   Signed-off-by: Anatolij Gustschin <agust@denx.de>
19  * reprogramming the FPGA and re-enabled after the FPGA has been programmed.
23 #include <linux/fpga/fpga-bridge.h>
50 static int alt_hps2fpga_enable_show(struct fpga_bridge *bridge)  in alt_hps2fpga_enable_show()
52 	struct altera_hps2fpga_data *priv = bridge->priv;  in alt_hps2fpga_enable_show()
54 	return reset_control_status(priv->bridge_reset);  in alt_hps2fpga_enable_show()
58 static unsigned int l3_remap_shadow;
59 static DEFINE_SPINLOCK(l3_remap_lock);
61 static int _alt_hps2fpga_enable_set(struct altera_hps2fpga_data *priv,  in _alt_hps2fpga_enable_set()
62 				    bool enable)  in _alt_hps2fpga_enable_set()  argument
68 	if (enable)  in _alt_hps2fpga_enable_set()
69 		ret = reset_control_deassert(priv->bridge_reset);  in _alt_hps2fpga_enable_set()
71 		ret = reset_control_assert(priv->bridge_reset);  in _alt_hps2fpga_enable_set()
76 	if (priv->remap_mask) {  in _alt_hps2fpga_enable_set()
80 		if (enable)  in _alt_hps2fpga_enable_set()
81 			l3_remap_shadow |= priv->remap_mask;  in _alt_hps2fpga_enable_set()
83 			l3_remap_shadow &= ~priv->remap_mask;  in _alt_hps2fpga_enable_set()
85 		ret = regmap_write(priv->l3reg, ALT_L3_REMAP_OFST,  in _alt_hps2fpga_enable_set()
93 static int alt_hps2fpga_enable_set(struct fpga_bridge *bridge, bool enable)  in alt_hps2fpga_enable_set()  argument
95 	return _alt_hps2fpga_enable_set(bridge->priv, enable);  in alt_hps2fpga_enable_set()
98 static const struct fpga_bridge_ops altera_hps2fpga_br_ops = {
103 static struct altera_hps2fpga_data hps2fpga_data  = {
108 static struct altera_hps2fpga_data lwhps2fpga_data  = {
113 static struct altera_hps2fpga_data fpga2hps_data  = {
117 static const struct of_device_id altera_fpga_of_match[] = {
118 	{ .compatible = "altr,socfpga-hps2fpga-bridge",
120 	{ .compatible = "altr,socfpga-lwhps2fpga-bridge",
122 	{ .compatible = "altr,socfpga-fpga2hps-bridge",
127 static int alt_fpga_bridge_probe(struct platform_device *pdev)  in alt_fpga_bridge_probe()
129 	struct device *dev = &pdev->dev;  in alt_fpga_bridge_probe()
132 	u32 enable;  in alt_fpga_bridge_probe()  local
137 	priv->bridge_reset = of_reset_control_get_exclusive_by_index(dev->of_node,  in alt_fpga_bridge_probe()
139 	if (IS_ERR(priv->bridge_reset)) {  in alt_fpga_bridge_probe()
140 		dev_err(dev, "Could not get %s reset control\n", priv->name);  in alt_fpga_bridge_probe()
141 		return PTR_ERR(priv->bridge_reset);  in alt_fpga_bridge_probe()
144 	if (priv->remap_mask) {  in alt_fpga_bridge_probe()
145 		priv->l3reg = syscon_regmap_lookup_by_compatible("altr,l3regs");  in alt_fpga_bridge_probe()
146 		if (IS_ERR(priv->l3reg)) {  in alt_fpga_bridge_probe()
148 			return PTR_ERR(priv->l3reg);  in alt_fpga_bridge_probe()
152 	priv->clk = devm_clk_get(dev, NULL);  in alt_fpga_bridge_probe()
153 	if (IS_ERR(priv->clk)) {  in alt_fpga_bridge_probe()
155 		return PTR_ERR(priv->clk);  in alt_fpga_bridge_probe()
158 	ret = clk_prepare_enable(priv->clk);  in alt_fpga_bridge_probe()
160 		dev_err(dev, "could not enable clock\n");  in alt_fpga_bridge_probe()
161 		return -EBUSY;  in alt_fpga_bridge_probe()
164 	if (!of_property_read_u32(dev->of_node, "bridge-enable", &enable)) {  in alt_fpga_bridge_probe()
165 		if (enable > 1) {  in alt_fpga_bridge_probe()
166 			dev_warn(dev, "invalid bridge-enable %u > 1\n", enable);  in alt_fpga_bridge_probe()
169 				 (enable ? "enabling" : "disabling"));  in alt_fpga_bridge_probe()
171 			ret = _alt_hps2fpga_enable_set(priv, enable);  in alt_fpga_bridge_probe()
177 	br = fpga_bridge_register(dev, priv->name,  in alt_fpga_bridge_probe()
189 	clk_disable_unprepare(priv->clk);  in alt_fpga_bridge_probe()
194 static void alt_fpga_bridge_remove(struct platform_device *pdev)  in alt_fpga_bridge_remove()
197 	struct altera_hps2fpga_data *priv = bridge->priv;  in alt_fpga_bridge_remove()
201 	clk_disable_unprepare(priv->clk);  in alt_fpga_bridge_remove()
206 static struct platform_driver alt_fpga_bridge_driver = {