1 // SPDX-License-Identifier: GPL-2.0-only
8  * Baikal-T1 AXI-bus driver
35  * struct bt1_axi - Baikal-T1 AXI-bus private data
37  * @qos_regs: AXI Interconnect QoS tuning registers.
38  * @sys_regs: Baikal-T1 System Controller registers map.
40  * @aclk: AXI reference clock.
41  * @arst: AXI Interconnect reset line.
60 	struct bt1_axi *axi = data;  in bt1_axi_isr()  local
63 	regmap_read(axi->sys_regs, BT1_AXI_WERRL, &low);  in bt1_axi_isr()
64 	regmap_read(axi->sys_regs, BT1_AXI_WERRH, &high);  in bt1_axi_isr()
66 	dev_crit_ratelimited(axi->dev,  in bt1_axi_isr()
67 		"AXI-bus fault %d: %s at 0x%x%08x\n",  in bt1_axi_isr()
68 		atomic_inc_return(&axi->count),  in bt1_axi_isr()
86 	struct bt1_axi *axi = data;  in bt1_axi_clear_data()  local
87 	struct platform_device *pdev = to_platform_device(axi->dev);  in bt1_axi_clear_data()
94 	struct device *dev = &pdev->dev;  in bt1_axi_create_data()
95 	struct bt1_axi *axi;  in bt1_axi_create_data()  local
98 	axi = devm_kzalloc(dev, sizeof(*axi), GFP_KERNEL);  in bt1_axi_create_data()
99 	if (!axi)  in bt1_axi_create_data()
100 		return ERR_PTR(-ENOMEM);  in bt1_axi_create_data()
102 	ret = devm_add_action(dev, bt1_axi_clear_data, axi);  in bt1_axi_create_data()
104 		dev_err(dev, "Can't add AXI EHB data clear action\n");  in bt1_axi_create_data()
108 	axi->dev = dev;  in bt1_axi_create_data()
109 	atomic_set(&axi->count, 0);  in bt1_axi_create_data()
110 	platform_set_drvdata(pdev, axi);  in bt1_axi_create_data()
112 	return axi;  in bt1_axi_create_data()
115 static int bt1_axi_request_regs(struct bt1_axi *axi)  in bt1_axi_request_regs()  argument
117 	struct platform_device *pdev = to_platform_device(axi->dev);  in bt1_axi_request_regs()
118 	struct device *dev = axi->dev;  in bt1_axi_request_regs()
120 	axi->sys_regs = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");  in bt1_axi_request_regs()
121 	if (IS_ERR(axi->sys_regs)) {  in bt1_axi_request_regs()
123 		return PTR_ERR(axi->sys_regs);  in bt1_axi_request_regs()
126 	axi->qos_regs = devm_platform_ioremap_resource_byname(pdev, "qos");  in bt1_axi_request_regs()
127 	if (IS_ERR(axi->qos_regs))  in bt1_axi_request_regs()
128 		dev_err(dev, "Couldn't map AXI-bus QoS registers\n");  in bt1_axi_request_regs()
130 	return PTR_ERR_OR_ZERO(axi->qos_regs);  in bt1_axi_request_regs()
133 static int bt1_axi_request_rst(struct bt1_axi *axi)  in bt1_axi_request_rst()  argument
137 	axi->arst = devm_reset_control_get_optional_exclusive(axi->dev, "arst");  in bt1_axi_request_rst()
138 	if (IS_ERR(axi->arst)) {  in bt1_axi_request_rst()
139 		dev_warn(axi->dev, "Couldn't get reset control line\n");  in bt1_axi_request_rst()
140 		return PTR_ERR(axi->arst);  in bt1_axi_request_rst()
143 	ret = reset_control_deassert(axi->arst);  in bt1_axi_request_rst()
145 		dev_err(axi->dev, "Failed to deassert the reset line\n");  in bt1_axi_request_rst()
152 	struct bt1_axi *axi = data;  in bt1_axi_disable_clk()  local
154 	clk_disable_unprepare(axi->aclk);  in bt1_axi_disable_clk()
157 static int bt1_axi_request_clk(struct bt1_axi *axi)  in bt1_axi_request_clk()  argument
161 	axi->aclk = devm_clk_get(axi->dev, "aclk");  in bt1_axi_request_clk()
162 	if (IS_ERR(axi->aclk)) {  in bt1_axi_request_clk()
163 		dev_err(axi->dev, "Couldn't get AXI Interconnect clock\n");  in bt1_axi_request_clk()
164 		return PTR_ERR(axi->aclk);  in bt1_axi_request_clk()
167 	ret = clk_prepare_enable(axi->aclk);  in bt1_axi_request_clk()
169 		dev_err(axi->dev, "Couldn't enable the AXI clock\n");  in bt1_axi_request_clk()
173 	ret = devm_add_action_or_reset(axi->dev, bt1_axi_disable_clk, axi);  in bt1_axi_request_clk()
175 		dev_err(axi->dev, "Can't add AXI clock disable action\n");  in bt1_axi_request_clk()
180 static int bt1_axi_request_irq(struct bt1_axi *axi)  in bt1_axi_request_irq()  argument
182 	struct platform_device *pdev = to_platform_device(axi->dev);  in bt1_axi_request_irq()
185 	axi->irq = platform_get_irq(pdev, 0);  in bt1_axi_request_irq()
186 	if (axi->irq < 0)  in bt1_axi_request_irq()
187 		return axi->irq;  in bt1_axi_request_irq()
189 	ret = devm_request_irq(axi->dev, axi->irq, bt1_axi_isr, IRQF_SHARED,  in bt1_axi_request_irq()
190 			       "bt1-axi", axi);  in bt1_axi_request_irq()
192 		dev_err(axi->dev, "Couldn't request AXI EHB IRQ\n");  in bt1_axi_request_irq()
200 	struct bt1_axi *axi = dev_get_drvdata(dev);  in count_show()  local
202 	return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&axi->count));  in count_show()
216 	struct bt1_axi *axi = dev_get_drvdata(dev);  in inject_error_store()  local
220 	 * error while unaligned writing - the AXI bus write error handled  in inject_error_store()
224 		readb(axi->qos_regs);  in inject_error_store()
226 		writeb(0, axi->qos_regs);  in inject_error_store()
228 		return -EINVAL;  in inject_error_store()
243 	struct bt1_axi *axi = data;  in bt1_axi_remove_sysfs()  local
245 	device_remove_groups(axi->dev, bt1_axi_sysfs_groups);  in bt1_axi_remove_sysfs()
248 static int bt1_axi_init_sysfs(struct bt1_axi *axi)  in bt1_axi_init_sysfs()  argument
252 	ret = device_add_groups(axi->dev, bt1_axi_sysfs_groups);  in bt1_axi_init_sysfs()
254 		dev_err(axi->dev, "Failed to add sysfs files group\n");  in bt1_axi_init_sysfs()
258 	ret = devm_add_action_or_reset(axi->dev, bt1_axi_remove_sysfs, axi);  in bt1_axi_init_sysfs()
260 		dev_err(axi->dev, "Can't add AXI EHB sysfs remove action\n");  in bt1_axi_init_sysfs()
267 	struct bt1_axi *axi;  in bt1_axi_probe()  local
270 	axi = bt1_axi_create_data(pdev);  in bt1_axi_probe()
271 	if (IS_ERR(axi))  in bt1_axi_probe()
272 		return PTR_ERR(axi);  in bt1_axi_probe()
274 	ret = bt1_axi_request_regs(axi);  in bt1_axi_probe()
278 	ret = bt1_axi_request_rst(axi);  in bt1_axi_probe()
282 	ret = bt1_axi_request_clk(axi);  in bt1_axi_probe()
286 	ret = bt1_axi_request_irq(axi);  in bt1_axi_probe()
290 	ret = bt1_axi_init_sysfs(axi);  in bt1_axi_probe()
298 	{ .compatible = "baikal,bt1-axi" },
306 		.name = "bt1-axi",
313 MODULE_DESCRIPTION("Baikal-T1 AXI-bus driver");