3  * Altera PCIe MSI support
12 #include <linux/irqchip/irq-msi-lib.h>
16 #include <linux/msi.h>
41 static inline void msi_writel(struct altera_msi *msi, const u32 value,  in msi_writel()  argument
44 	writel_relaxed(value, msi->csr_base + reg);  in msi_writel()
47 static inline u32 msi_readl(struct altera_msi *msi, const u32 reg)  in msi_readl()  argument
49 	return readl_relaxed(msi->csr_base + reg);  in msi_readl()
55 	struct altera_msi *msi;  in altera_msi_isr()  local
61 	msi = irq_desc_get_handler_data(desc);  in altera_msi_isr()
63 	while ((status = msi_readl(msi, MSI_STATUS)) != 0) {  in altera_msi_isr()
64 		for_each_set_bit(bit, &status, msi->num_of_vectors) {  in altera_msi_isr()
66 			readl_relaxed(msi->vector_base + (bit * sizeof(u32)));  in altera_msi_isr()
68 			ret = generic_handle_domain_irq(msi->inner_domain, bit);  in altera_msi_isr()
70 				dev_err_ratelimited(&msi->pdev->dev, "unexpected MSI\n");  in altera_msi_isr()
93 	struct altera_msi *msi = irq_data_get_irq_chip_data(data);  in altera_compose_msi_msg()  local
94 	phys_addr_t addr = msi->vector_phy + (data->hwirq * sizeof(u32));  in altera_compose_msi_msg()
100 	dev_dbg(&msi->pdev->dev, "msi#%d address_hi %#x address_lo %#x\n",  in altera_compose_msi_msg()
105 	.name			= "Altera MSI",
112 	struct altera_msi *msi = domain->host_data;  in altera_irq_domain_alloc()  local
117 	mutex_lock(&msi->lock);  in altera_irq_domain_alloc()
119 	bit = find_first_zero_bit(msi->used, msi->num_of_vectors);  in altera_irq_domain_alloc()
120 	if (bit >= msi->num_of_vectors) {  in altera_irq_domain_alloc()
121 		mutex_unlock(&msi->lock);  in altera_irq_domain_alloc()
125 	set_bit(bit, msi->used);  in altera_irq_domain_alloc()
127 	mutex_unlock(&msi->lock);  in altera_irq_domain_alloc()
133 	mask = msi_readl(msi, MSI_INTMASK);  in altera_irq_domain_alloc()
135 	msi_writel(msi, mask, MSI_INTMASK);  in altera_irq_domain_alloc()
144 	struct altera_msi *msi = irq_data_get_irq_chip_data(d);  in altera_irq_domain_free()  local
147 	mutex_lock(&msi->lock);  in altera_irq_domain_free()
149 	if (!test_bit(d->hwirq, msi->used)) {  in altera_irq_domain_free()
150 		dev_err(&msi->pdev->dev, "trying to free unused MSI#%lu\n",  in altera_irq_domain_free()
153 		__clear_bit(d->hwirq, msi->used);  in altera_irq_domain_free()
154 		mask = msi_readl(msi, MSI_INTMASK);  in altera_irq_domain_free()
156 		msi_writel(msi, mask, MSI_INTMASK);  in altera_irq_domain_free()
159 	mutex_unlock(&msi->lock);  in altera_irq_domain_free()
167 static int altera_allocate_domains(struct altera_msi *msi)  in altera_allocate_domains()  argument
170 		.fwnode		= dev_fwnode(&msi->pdev->dev),  in altera_allocate_domains()
172 		.host_data	= msi,  in altera_allocate_domains()
173 		.size		= msi->num_of_vectors,  in altera_allocate_domains()
176 	msi->inner_domain = msi_create_parent_irq_domain(&info, &altera_msi_parent_ops);  in altera_allocate_domains()
177 	if (!msi->inner_domain) {  in altera_allocate_domains()
178 		dev_err(&msi->pdev->dev, "failed to create MSI domain\n");  in altera_allocate_domains()
185 static void altera_free_domains(struct altera_msi *msi)  in altera_free_domains()  argument
187 	irq_domain_remove(msi->inner_domain);  in altera_free_domains()
192 	struct altera_msi *msi = platform_get_drvdata(pdev);  in altera_msi_remove()  local
194 	msi_writel(msi, 0, MSI_INTMASK);  in altera_msi_remove()
195 	irq_set_chained_handler_and_data(msi->irq, NULL, NULL);  in altera_msi_remove()
197 	altera_free_domains(msi);  in altera_msi_remove()
204 	struct altera_msi *msi;  in altera_msi_probe()  local
209 	msi = devm_kzalloc(&pdev->dev, sizeof(struct altera_msi),  in altera_msi_probe()
211 	if (!msi)  in altera_msi_probe()
214 	mutex_init(&msi->lock);  in altera_msi_probe()
215 	msi->pdev = pdev;  in altera_msi_probe()
217 	msi->csr_base = devm_platform_ioremap_resource_byname(pdev, "csr");  in altera_msi_probe()
218 	if (IS_ERR(msi->csr_base)) {  in altera_msi_probe()
220 		return PTR_ERR(msi->csr_base);  in altera_msi_probe()
225 	msi->vector_base = devm_ioremap_resource(&pdev->dev, res);  in altera_msi_probe()
226 	if (IS_ERR(msi->vector_base))  in altera_msi_probe()
227 		return PTR_ERR(msi->vector_base);  in altera_msi_probe()
229 	msi->vector_phy = res->start;  in altera_msi_probe()
231 	if (of_property_read_u32(np, "num-vectors", &msi->num_of_vectors)) {  in altera_msi_probe()
236 	ret = altera_allocate_domains(msi);  in altera_msi_probe()
240 	msi->irq = platform_get_irq(pdev, 0);  in altera_msi_probe()
241 	if (msi->irq < 0) {  in altera_msi_probe()
242 		ret = msi->irq;  in altera_msi_probe()
246 	irq_set_chained_handler_and_data(msi->irq, altera_msi_isr, msi);  in altera_msi_probe()
247 	platform_set_drvdata(pdev, msi);  in altera_msi_probe()
257 	{ .compatible = "altr,msi-1.0", NULL },
263 		.name = "altera-msi",
283 MODULE_DESCRIPTION("Altera PCIe MSI support driver");