drivers/bus/bt1-axi.c

8  * Baikal-T1 AXI-bus driver
35  * struct bt1_axi - Baikal-T1 AXI-bus private data
37  * @qos_regs: AXI Interconnect QoS tuning registers.
40  * @aclk: AXI reference clock.
41  * @arst: AXI Interconnect reset line.
60 	struct bt1_axi *axi = data;
63 	regmap_read(axi->sys_regs, BT1_AXI_WERRL, &low);
64 	regmap_read(axi->sys_regs, BT1_AXI_WERRH, &high);
66 	dev_crit_ratelimited(axi->dev,
67 		"AXI-bus fault %d: %s at 0x%x%08x\n",
68 		atomic_inc_return(&axi->count),
86 	struct bt1_axi *axi = data;
87 	struct platform_device *pdev = to_platform_device(axi->dev);
95 	struct bt1_axi *axi;
98 	axi = devm_kzalloc(dev, sizeof(*axi), GFP_KERNEL);
99 	if (!axi)
102 	ret = devm_add_action(dev, bt1_axi_clear_data, axi);
104 		dev_err(dev, "Can't add AXI EHB data clear action\n");
108 	axi->dev = dev;
109 	atomic_set(&axi->count, 0);
110 	platform_set_drvdata(pdev, axi);
112 	return axi;
115 static int bt1_axi_request_regs(struct bt1_axi *axi)
117 	struct platform_device *pdev = to_platform_device(axi->dev);
118 	struct device *dev = axi->dev;
120 	axi->sys_regs = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
121 	if (IS_ERR(axi->sys_regs)) {
123 		return PTR_ERR(axi->sys_regs);
126 	axi->qos_regs = devm_platform_ioremap_resource_byname(pdev, "qos");
127 	if (IS_ERR(axi->qos_regs))
128 		dev_err(dev, "Couldn't map AXI-bus QoS registers\n");
130 	return PTR_ERR_OR_ZERO(axi->qos_regs);
133 static int bt1_axi_request_rst(struct bt1_axi *axi)
137 	axi->arst = devm_reset_control_get_optional_exclusive(axi->dev, "arst");
138 	if (IS_ERR(axi->arst))
139 		return dev_err_probe(axi->dev, PTR_ERR(axi->arst),
142 	ret = reset_control_deassert(axi->arst);
144 		dev_err(axi->dev, "Failed to deassert the reset line\n");
149 static int bt1_axi_request_clk(struct bt1_axi *axi)
151 	axi->aclk = devm_clk_get_enabled(axi->dev, "aclk");
152 	if (IS_ERR(axi->aclk))
153 		return dev_err_probe(axi->dev, PTR_ERR(axi->aclk),
154 				     "Couldn't get AXI Interconnect clock\n");
159 static int bt1_axi_request_irq(struct bt1_axi *axi)
161 	struct platform_device *pdev = to_platform_device(axi->dev);
164 	axi->irq = platform_get_irq(pdev, 0);
165 	if (axi->irq < 0)
166 		return axi->irq;
168 	ret = devm_request_irq(axi->dev, axi->irq, bt1_axi_isr, IRQF_SHARED,
169 			       "bt1-axi", axi);
171 		dev_err(axi->dev, "Couldn't request AXI EHB IRQ\n");
179 	struct bt1_axi *axi = dev_get_drvdata(dev);
181 	return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&axi->count));
195 	struct bt1_axi *axi = dev_get_drvdata(dev);
199 	 * error while unaligned writing - the AXI bus write error handled
203 		readb(axi->qos_regs);
205 		writeb(0, axi->qos_regs);
222 	struct bt1_axi *axi = data;
224 	device_remove_groups(axi->dev, bt1_axi_sysfs_groups);
227 static int bt1_axi_init_sysfs(struct bt1_axi *axi)
231 	ret = device_add_groups(axi->dev, bt1_axi_sysfs_groups);
233 		dev_err(axi->dev, "Failed to add sysfs files group\n");
237 	ret = devm_add_action_or_reset(axi->dev, bt1_axi_remove_sysfs, axi);
239 		dev_err(axi->dev, "Can't add AXI EHB sysfs remove action\n");
246 	struct bt1_axi *axi;
249 	axi = bt1_axi_create_data(pdev);
250 	if (IS_ERR(axi))
251 		return PTR_ERR(axi);
253 	ret = bt1_axi_request_regs(axi);
257 	ret = bt1_axi_request_rst(axi);
261 	ret = bt1_axi_request_clk(axi);
265 	ret = bt1_axi_request_irq(axi);
269 	ret = bt1_axi_init_sysfs(axi);
277 	{ .compatible = "baikal,bt1-axi" },
285 		.name = "bt1-axi",
292 MODULE_DESCRIPTION("Baikal-T1 AXI-bus driver");