2 * pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
4 * Copyright (C) 2013-2014 Texas Instruments Incorporated - http://www.ti.com
6 * Authors: Kishon Vijay Abraham I <kishon@ti.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/delay.h>
14 #include <linux/err.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/irqdomain.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/phy/phy.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/resource.h>
25 #include <linux/types.h>
27 #include "pcie-designware.h"
29 /* PCIe controller wrapper DRA7XX configuration registers */
31 #define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN 0x0024
32 #define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN 0x0028
33 #define ERR_SYS BIT(0)
34 #define ERR_FATAL BIT(1)
35 #define ERR_NONFATAL BIT(2)
36 #define ERR_COR BIT(3)
37 #define ERR_AXI BIT(4)
38 #define ERR_ECRC BIT(5)
39 #define PME_TURN_OFF BIT(8)
40 #define PME_TO_ACK BIT(9)
41 #define PM_PME BIT(10)
42 #define LINK_REQ_RST BIT(11)
43 #define LINK_UP_EVT BIT(12)
44 #define CFG_BME_EVT BIT(13)
45 #define CFG_MSE_EVT BIT(14)
46 #define INTERRUPTS (ERR_SYS | ERR_FATAL | ERR_NONFATAL | ERR_COR | ERR_AXI | \
47 ERR_ECRC | PME_TURN_OFF | PME_TO_ACK | PM_PME | \
48 LINK_REQ_RST | LINK_UP_EVT | CFG_BME_EVT | CFG_MSE_EVT)
50 #define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI 0x0034
51 #define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI 0x0038
57 #define LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD)
59 #define PCIECTRL_DRA7XX_CONF_DEVICE_CMD 0x0104
62 #define PCIECTRL_DRA7XX_CONF_PHY_CS 0x010C
63 #define LINK_UP BIT(16)
73 #define to_dra7xx_pcie(x) container_of((x), struct dra7xx_pcie, pp)
75 static inline u32 dra7xx_pcie_readl(struct dra7xx_pcie *pcie, u32 offset)
77 return readl(pcie->base + offset);
80 static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
83 writel(value, pcie->base + offset);
86 static int dra7xx_pcie_link_up(struct pcie_port *pp)
88 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
89 u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);
91 return !!(reg & LINK_UP);
94 static int dra7xx_pcie_establish_link(struct pcie_port *pp)
97 unsigned int retries = 1000;
98 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
100 if (dw_pcie_link_up(pp)) {
101 dev_err(pp->dev, "link is already up\n");
105 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
107 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
110 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);
113 usleep_range(10, 20);
117 dev_err(pp->dev, "link is not up\n");
124 static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
126 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
128 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
130 dra7xx_pcie_writel(dra7xx,
131 PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN, INTERRUPTS);
132 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
133 ~LEG_EP_INTERRUPTS & ~MSI);
135 if (IS_ENABLED(CONFIG_PCI_MSI))
136 dra7xx_pcie_writel(dra7xx,
137 PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI, MSI);
139 dra7xx_pcie_writel(dra7xx,
140 PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
144 static void dra7xx_pcie_host_init(struct pcie_port *pp)
146 dw_pcie_setup_rc(pp);
147 dra7xx_pcie_establish_link(pp);
148 if (IS_ENABLED(CONFIG_PCI_MSI))
149 dw_pcie_msi_init(pp);
150 dra7xx_pcie_enable_interrupts(pp);
153 static struct pcie_host_ops dra7xx_pcie_host_ops = {
154 .link_up = dra7xx_pcie_link_up,
155 .host_init = dra7xx_pcie_host_init,
158 static int dra7xx_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
159 irq_hw_number_t hwirq)
161 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
162 irq_set_chip_data(irq, domain->host_data);
163 set_irq_flags(irq, IRQF_VALID);
168 static const struct irq_domain_ops intx_domain_ops = {
169 .map = dra7xx_pcie_intx_map,
172 static int dra7xx_pcie_init_irq_domain(struct pcie_port *pp)
174 struct device *dev = pp->dev;
175 struct device_node *node = dev->of_node;
176 struct device_node *pcie_intc_node = of_get_next_child(node, NULL);
178 if (!pcie_intc_node) {
179 dev_err(dev, "No PCIe Intc node found\n");
180 return PTR_ERR(pcie_intc_node);
183 pp->irq_domain = irq_domain_add_linear(pcie_intc_node, 4,
184 &intx_domain_ops, pp);
185 if (!pp->irq_domain) {
186 dev_err(dev, "Failed to get a INTx IRQ domain\n");
187 return PTR_ERR(pp->irq_domain);
193 static irqreturn_t dra7xx_pcie_msi_irq_handler(int irq, void *arg)
195 struct pcie_port *pp = arg;
196 struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
199 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
203 dw_handle_msi_irq(pp);
209 generic_handle_irq(irq_find_mapping(pp->irq_domain, ffs(reg)));
213 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI, reg);
219 static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
221 struct dra7xx_pcie *dra7xx = arg;
224 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);
227 dev_dbg(dra7xx->dev, "System Error\n");
230 dev_dbg(dra7xx->dev, "Fatal Error\n");
232 if (reg & ERR_NONFATAL)
233 dev_dbg(dra7xx->dev, "Non Fatal Error\n");
236 dev_dbg(dra7xx->dev, "Correctable Error\n");
239 dev_dbg(dra7xx->dev, "AXI tag lookup fatal Error\n");
242 dev_dbg(dra7xx->dev, "ECRC Error\n");
244 if (reg & PME_TURN_OFF)
246 "Power Management Event Turn-Off message received\n");
248 if (reg & PME_TO_ACK)
250 "Power Management Turn-Off Ack message received\n");
254 "PM Power Management Event message received\n");
256 if (reg & LINK_REQ_RST)
257 dev_dbg(dra7xx->dev, "Link Request Reset\n");
259 if (reg & LINK_UP_EVT)
260 dev_dbg(dra7xx->dev, "Link-up state change\n");
262 if (reg & CFG_BME_EVT)
263 dev_dbg(dra7xx->dev, "CFG 'Bus Master Enable' change\n");
265 if (reg & CFG_MSE_EVT)
266 dev_dbg(dra7xx->dev, "CFG 'Memory Space Enable' change\n");
268 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN, reg);
273 static int add_pcie_port(struct dra7xx_pcie *dra7xx,
274 struct platform_device *pdev)
277 struct pcie_port *pp;
278 struct resource *res;
279 struct device *dev = &pdev->dev;
283 pp->ops = &dra7xx_pcie_host_ops;
285 pp->irq = platform_get_irq(pdev, 1);
287 dev_err(dev, "missing IRQ resource\n");
291 ret = devm_request_irq(&pdev->dev, pp->irq,
292 dra7xx_pcie_msi_irq_handler, IRQF_SHARED,
293 "dra7-pcie-msi", pp);
295 dev_err(&pdev->dev, "failed to request irq\n");
299 if (!IS_ENABLED(CONFIG_PCI_MSI)) {
300 ret = dra7xx_pcie_init_irq_domain(pp);
305 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbics");
306 pp->dbi_base = devm_ioremap(dev, res->start, resource_size(res));
310 ret = dw_pcie_host_init(pp);
312 dev_err(dra7xx->dev, "failed to initialize host\n");
319 static int __init dra7xx_pcie_probe(struct platform_device *pdev)
328 struct resource *res;
329 struct dra7xx_pcie *dra7xx;
330 struct device *dev = &pdev->dev;
331 struct device_node *np = dev->of_node;
334 dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
338 irq = platform_get_irq(pdev, 0);
340 dev_err(dev, "missing IRQ resource\n");
344 ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
345 IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
347 dev_err(dev, "failed to request irq\n");
351 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
352 base = devm_ioremap_nocache(dev, res->start, resource_size(res));
356 phy_count = of_property_count_strings(np, "phy-names");
358 dev_err(dev, "unable to find the strings\n");
362 phy = devm_kzalloc(dev, sizeof(*phy) * phy_count, GFP_KERNEL);
366 for (i = 0; i < phy_count; i++) {
367 snprintf(name, sizeof(name), "pcie-phy%d", i);
368 phy[i] = devm_phy_get(dev, name);
370 return PTR_ERR(phy[i]);
372 ret = phy_init(phy[i]);
376 ret = phy_power_on(phy[i]);
386 dra7xx->phy_count = phy_count;
388 pm_runtime_enable(dev);
389 ret = pm_runtime_get_sync(dev);
390 if (IS_ERR_VALUE(ret)) {
391 dev_err(dev, "pm_runtime_get_sync failed\n");
395 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
397 dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
399 platform_set_drvdata(pdev, dra7xx);
401 ret = add_pcie_port(dra7xx, pdev);
409 pm_runtime_disable(dev);
413 phy_power_off(phy[i]);
420 static int __exit dra7xx_pcie_remove(struct platform_device *pdev)
422 struct dra7xx_pcie *dra7xx = platform_get_drvdata(pdev);
423 struct pcie_port *pp = &dra7xx->pp;
424 struct device *dev = &pdev->dev;
425 int count = dra7xx->phy_count;
428 irq_domain_remove(pp->irq_domain);
430 pm_runtime_disable(dev);
432 phy_power_off(dra7xx->phy[count]);
433 phy_exit(dra7xx->phy[count]);
439 static const struct of_device_id of_dra7xx_pcie_match[] = {
440 { .compatible = "ti,dra7-pcie", },
443 MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);
445 static struct platform_driver dra7xx_pcie_driver = {
446 .remove = __exit_p(dra7xx_pcie_remove),
449 .owner = THIS_MODULE,
450 .of_match_table = of_dra7xx_pcie_match,
454 module_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
456 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
457 MODULE_DESCRIPTION("TI PCIe controller driver");
458 MODULE_LICENSE("GPL v2");