1 // SPDX-License-Identifier: GPL-2.0
3  * FPGA Freeze Bridge Controller
13 #include <linux/fpga/fpga-bridge.h>
30 #define FREEZE_BRIDGE_NAME			"freeze"
44 	struct device *dev = priv->dev;  in altera_freeze_br_req_ack()
45 	void __iomem *csr_illegal_req_addr = priv->base_addr +  in altera_freeze_br_req_ack()
48 	int ret = -ETIMEDOUT;  in altera_freeze_br_req_ack()
62 			ret = -EINVAL;  in altera_freeze_br_req_ack()
66 		status = readl(priv->base_addr + FREEZE_CSR_STATUS_OFFSET);  in altera_freeze_br_req_ack()
70 			ctrl = readl(priv->base_addr + FREEZE_CSR_CTRL_OFFSET);  in altera_freeze_br_req_ack()
78 	} while (timeout--);  in altera_freeze_br_req_ack()
80 	if (ret == -ETIMEDOUT)  in altera_freeze_br_req_ack()
90 	struct device *dev = priv->dev;  in altera_freeze_br_do_freeze()
91 	void __iomem *csr_ctrl_addr = priv->base_addr +  in altera_freeze_br_do_freeze()
96 	status = readl(priv->base_addr + FREEZE_CSR_STATUS_OFFSET);  in altera_freeze_br_do_freeze()
101 		dev_dbg(dev, "%s bridge already disabled %d\n",  in altera_freeze_br_do_freeze()
105 		dev_err(dev, "%s bridge not enabled %d\n", __func__, status);  in altera_freeze_br_do_freeze()
106 		return -EINVAL;  in altera_freeze_br_do_freeze()
125 	struct device *dev = priv->dev;  in altera_freeze_br_do_unfreeze()
126 	void __iomem *csr_ctrl_addr = priv->base_addr +  in altera_freeze_br_do_unfreeze()
133 	status = readl(priv->base_addr + FREEZE_CSR_STATUS_OFFSET);  in altera_freeze_br_do_unfreeze()
138 		dev_dbg(dev, "%s bridge already enabled %d\n",  in altera_freeze_br_do_unfreeze()
142 		dev_err(dev, "%s bridge not frozen %d\n", __func__, status);  in altera_freeze_br_do_unfreeze()
143 		return -EINVAL;  in altera_freeze_br_do_unfreeze()
151 	status = readl(priv->base_addr + FREEZE_CSR_STATUS_OFFSET);  in altera_freeze_br_do_unfreeze()
161  * enable = 1 : allow traffic through the bridge
162  * enable = 0 : disable traffic through the bridge
164 static int altera_freeze_br_enable_set(struct fpga_bridge *bridge,  in altera_freeze_br_enable_set()  argument
167 	struct altera_freeze_br_data *priv = bridge->priv;  in altera_freeze_br_enable_set()
168 	struct fpga_image_info *info = bridge->info;  in altera_freeze_br_enable_set()
174 			timeout = info->enable_timeout_us;  in altera_freeze_br_enable_set()
176 		ret = altera_freeze_br_do_unfreeze(bridge->priv, timeout);  in altera_freeze_br_enable_set()
179 			timeout = info->disable_timeout_us;  in altera_freeze_br_enable_set()
181 		ret = altera_freeze_br_do_freeze(bridge->priv, timeout);  in altera_freeze_br_enable_set()
185 		priv->enable = enable;  in altera_freeze_br_enable_set()
190 static int altera_freeze_br_enable_show(struct fpga_bridge *bridge)  in altera_freeze_br_enable_show()  argument
192 	struct altera_freeze_br_data *priv = bridge->priv;  in altera_freeze_br_enable_show()
194 	return priv->enable;  in altera_freeze_br_enable_show()
203 	{ .compatible = "altr,freeze-bridge-controller", },
210 	struct device *dev = &pdev->dev;  in altera_freeze_br_probe()
211 	struct device_node *np = pdev->dev.of_node;  in altera_freeze_br_probe()
218 		return -ENODEV;  in altera_freeze_br_probe()
231 		return -EINVAL;  in altera_freeze_br_probe()
236 		return -ENOMEM;  in altera_freeze_br_probe()
238 	priv->dev = dev;  in altera_freeze_br_probe()
242 		priv->enable = 1;  in altera_freeze_br_probe()
244 	priv->base_addr = base_addr;  in altera_freeze_br_probe()
274 MODULE_DESCRIPTION("Altera Freeze Bridge");