2 * Synopsys Designware PCIe host controller driver
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
7 * Author: Jingoo Han <jg1.han@samsung.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/of_address.h>
17 #include <linux/pci.h>
18 #include <linux/pci_regs.h>
19 #include <linux/types.h>
21 #include "pcie-designware.h"
23 /* Synopsis specific PCIE configuration registers */
24 #define PCIE_PORT_LINK_CONTROL 0x710
25 #define PORT_LINK_MODE_MASK (0x3f << 16)
26 #define PORT_LINK_MODE_1_LANES (0x1 << 16)
27 #define PORT_LINK_MODE_2_LANES (0x3 << 16)
28 #define PORT_LINK_MODE_4_LANES (0x7 << 16)
30 #define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
31 #define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
32 #define PORT_LOGIC_LINK_WIDTH_MASK (0x1ff << 8)
33 #define PORT_LOGIC_LINK_WIDTH_1_LANES (0x1 << 8)
34 #define PORT_LOGIC_LINK_WIDTH_2_LANES (0x2 << 8)
35 #define PORT_LOGIC_LINK_WIDTH_4_LANES (0x4 << 8)
37 #define PCIE_MSI_ADDR_LO 0x820
38 #define PCIE_MSI_ADDR_HI 0x824
39 #define PCIE_MSI_INTR0_ENABLE 0x828
40 #define PCIE_MSI_INTR0_MASK 0x82C
41 #define PCIE_MSI_INTR0_STATUS 0x830
43 #define PCIE_ATU_VIEWPORT 0x900
44 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
45 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
46 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
47 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
48 #define PCIE_ATU_CR1 0x904
49 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
50 #define PCIE_ATU_TYPE_IO (0x2 << 0)
51 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
52 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
53 #define PCIE_ATU_CR2 0x908
54 #define PCIE_ATU_ENABLE (0x1 << 31)
55 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
56 #define PCIE_ATU_LOWER_BASE 0x90C
57 #define PCIE_ATU_UPPER_BASE 0x910
58 #define PCIE_ATU_LIMIT 0x914
59 #define PCIE_ATU_LOWER_TARGET 0x918
60 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
61 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
62 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
63 #define PCIE_ATU_UPPER_TARGET 0x91C
65 static struct hw_pci dw_pci;
67 unsigned long global_io_offset;
69 static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
71 return sys->private_data;
74 int cfg_read(void __iomem *addr, int where, int size, u32 *val)
79 *val = (*val >> (8 * (where & 3))) & 0xff;
81 *val = (*val >> (8 * (where & 3))) & 0xffff;
83 return PCIBIOS_BAD_REGISTER_NUMBER;
85 return PCIBIOS_SUCCESSFUL;
88 int cfg_write(void __iomem *addr, int where, int size, u32 val)
93 writew(val, addr + (where & 2));
95 writeb(val, addr + (where & 3));
97 return PCIBIOS_BAD_REGISTER_NUMBER;
99 return PCIBIOS_SUCCESSFUL;
102 static inline void dw_pcie_readl_rc(struct pcie_port *pp, u32 reg, u32 *val)
104 if (pp->ops->readl_rc)
105 pp->ops->readl_rc(pp, pp->dbi_base + reg, val);
107 *val = readl(pp->dbi_base + reg);
110 static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val, u32 reg)
112 if (pp->ops->writel_rc)
113 pp->ops->writel_rc(pp, val, pp->dbi_base + reg);
115 writel(val, pp->dbi_base + reg);
118 int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
123 if (pp->ops->rd_own_conf)
124 ret = pp->ops->rd_own_conf(pp, where, size, val);
126 ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
131 int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
136 if (pp->ops->wr_own_conf)
137 ret = pp->ops->wr_own_conf(pp, where, size, val);
139 ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size,
145 int dw_pcie_link_up(struct pcie_port *pp)
147 if (pp->ops->link_up)
148 return pp->ops->link_up(pp);
153 int __init dw_pcie_host_init(struct pcie_port *pp)
155 struct device_node *np = pp->dev->of_node;
156 struct of_pci_range range;
157 struct of_pci_range_parser parser;
160 if (of_pci_range_parser_init(&parser, np)) {
161 dev_err(pp->dev, "missing ranges property\n");
165 /* Get the I/O and memory ranges from DT */
166 for_each_of_pci_range(&parser, &range) {
167 unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
168 if (restype == IORESOURCE_IO) {
169 of_pci_range_to_resource(&range, np, &pp->io);
171 pp->io.start = max_t(resource_size_t,
173 range.pci_addr + global_io_offset);
174 pp->io.end = min_t(resource_size_t,
176 range.pci_addr + range.size
178 pp->config.io_size = resource_size(&pp->io);
179 pp->config.io_bus_addr = range.pci_addr;
181 if (restype == IORESOURCE_MEM) {
182 of_pci_range_to_resource(&range, np, &pp->mem);
183 pp->mem.name = "MEM";
184 pp->config.mem_size = resource_size(&pp->mem);
185 pp->config.mem_bus_addr = range.pci_addr;
188 of_pci_range_to_resource(&range, np, &pp->cfg);
189 pp->config.cfg0_size = resource_size(&pp->cfg)/2;
190 pp->config.cfg1_size = resource_size(&pp->cfg)/2;
195 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
196 resource_size(&pp->cfg));
198 dev_err(pp->dev, "error with ioremap\n");
203 pp->cfg0_base = pp->cfg.start;
204 pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
205 pp->io_base = pp->io.start;
206 pp->mem_base = pp->mem.start;
208 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
209 pp->config.cfg0_size);
210 if (!pp->va_cfg0_base) {
211 dev_err(pp->dev, "error with ioremap in function\n");
214 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
215 pp->config.cfg1_size);
216 if (!pp->va_cfg1_base) {
217 dev_err(pp->dev, "error with ioremap\n");
221 if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
222 dev_err(pp->dev, "Failed to parse the number of lanes\n");
226 if (pp->ops->host_init)
227 pp->ops->host_init(pp);
229 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
231 /* program correct class for RC */
232 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
234 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
235 val |= PORT_LOGIC_SPEED_CHANGE;
236 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
238 dw_pci.nr_controllers = 1;
239 dw_pci.private_data = (void **)&pp;
241 pci_common_init(&dw_pci);
242 pci_assign_unassigned_resources();
243 #ifdef CONFIG_PCI_DOMAINS
250 static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
252 /* Program viewport 0 : OUTBOUND : CFG0 */
253 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
255 dw_pcie_writel_rc(pp, pp->cfg0_base, PCIE_ATU_LOWER_BASE);
256 dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32), PCIE_ATU_UPPER_BASE);
257 dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
259 dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
260 dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
261 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG0, PCIE_ATU_CR1);
262 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
265 static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
267 /* Program viewport 1 : OUTBOUND : CFG1 */
268 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
270 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1);
271 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
272 dw_pcie_writel_rc(pp, pp->cfg1_base, PCIE_ATU_LOWER_BASE);
273 dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32), PCIE_ATU_UPPER_BASE);
274 dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
276 dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
277 dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
280 static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
282 /* Program viewport 0 : OUTBOUND : MEM */
283 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
285 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1);
286 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
287 dw_pcie_writel_rc(pp, pp->mem_base, PCIE_ATU_LOWER_BASE);
288 dw_pcie_writel_rc(pp, (pp->mem_base >> 32), PCIE_ATU_UPPER_BASE);
289 dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
291 dw_pcie_writel_rc(pp, pp->config.mem_bus_addr, PCIE_ATU_LOWER_TARGET);
292 dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
293 PCIE_ATU_UPPER_TARGET);
296 static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
298 /* Program viewport 1 : OUTBOUND : IO */
299 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
301 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1);
302 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
303 dw_pcie_writel_rc(pp, pp->io_base, PCIE_ATU_LOWER_BASE);
304 dw_pcie_writel_rc(pp, (pp->io_base >> 32), PCIE_ATU_UPPER_BASE);
305 dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
307 dw_pcie_writel_rc(pp, pp->config.io_bus_addr, PCIE_ATU_LOWER_TARGET);
308 dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
309 PCIE_ATU_UPPER_TARGET);
312 static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
313 u32 devfn, int where, int size, u32 *val)
315 int ret = PCIBIOS_SUCCESSFUL;
318 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
319 PCIE_ATU_FUNC(PCI_FUNC(devfn));
320 address = where & ~0x3;
322 if (bus->parent->number == pp->root_bus_nr) {
323 dw_pcie_prog_viewport_cfg0(pp, busdev);
324 ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
325 dw_pcie_prog_viewport_mem_outbound(pp);
327 dw_pcie_prog_viewport_cfg1(pp, busdev);
328 ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
329 dw_pcie_prog_viewport_io_outbound(pp);
335 static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
336 u32 devfn, int where, int size, u32 val)
338 int ret = PCIBIOS_SUCCESSFUL;
341 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
342 PCIE_ATU_FUNC(PCI_FUNC(devfn));
343 address = where & ~0x3;
345 if (bus->parent->number == pp->root_bus_nr) {
346 dw_pcie_prog_viewport_cfg0(pp, busdev);
347 ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
348 dw_pcie_prog_viewport_mem_outbound(pp);
350 dw_pcie_prog_viewport_cfg1(pp, busdev);
351 ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
352 dw_pcie_prog_viewport_io_outbound(pp);
359 static int dw_pcie_valid_config(struct pcie_port *pp,
360 struct pci_bus *bus, int dev)
362 /* If there is no link, then there is no device */
363 if (bus->number != pp->root_bus_nr) {
364 if (!dw_pcie_link_up(pp))
368 /* access only one slot on each root port */
369 if (bus->number == pp->root_bus_nr && dev > 0)
373 * do not read more than one device on the bus directly attached
374 * to RC's (Virtual Bridge's) DS side.
376 if (bus->primary == pp->root_bus_nr && dev > 0)
382 static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
385 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
394 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
396 return PCIBIOS_DEVICE_NOT_FOUND;
399 spin_lock_irqsave(&pp->conf_lock, flags);
400 if (bus->number != pp->root_bus_nr)
401 ret = dw_pcie_rd_other_conf(pp, bus, devfn,
404 ret = dw_pcie_rd_own_conf(pp, where, size, val);
405 spin_unlock_irqrestore(&pp->conf_lock, flags);
410 static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
411 int where, int size, u32 val)
413 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
422 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
423 return PCIBIOS_DEVICE_NOT_FOUND;
425 spin_lock_irqsave(&pp->conf_lock, flags);
426 if (bus->number != pp->root_bus_nr)
427 ret = dw_pcie_wr_other_conf(pp, bus, devfn,
430 ret = dw_pcie_wr_own_conf(pp, where, size, val);
431 spin_unlock_irqrestore(&pp->conf_lock, flags);
436 static struct pci_ops dw_pcie_ops = {
437 .read = dw_pcie_rd_conf,
438 .write = dw_pcie_wr_conf,
441 int dw_pcie_setup(int nr, struct pci_sys_data *sys)
443 struct pcie_port *pp;
445 pp = sys_to_pcie(sys);
450 if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
451 sys->io_offset = global_io_offset - pp->config.io_bus_addr;
452 pci_ioremap_io(sys->io_offset, pp->io.start);
453 global_io_offset += SZ_64K;
454 pci_add_resource_offset(&sys->resources, &pp->io,
458 sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
459 pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
464 struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
467 struct pcie_port *pp = sys_to_pcie(sys);
470 pp->root_bus_nr = sys->busnr;
471 bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops,
472 sys, &sys->resources);
481 int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
483 struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
488 static struct hw_pci dw_pci = {
489 .setup = dw_pcie_setup,
490 .scan = dw_pcie_scan_bus,
491 .map_irq = dw_pcie_map_irq,
494 void dw_pcie_setup_rc(struct pcie_port *pp)
496 struct pcie_port_info *config = &pp->config;
501 /* set the number of lines as 4 */
502 dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
503 val &= ~PORT_LINK_MODE_MASK;
506 val |= PORT_LINK_MODE_1_LANES;
509 val |= PORT_LINK_MODE_2_LANES;
512 val |= PORT_LINK_MODE_4_LANES;
515 dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL);
517 /* set link width speed control register */
518 dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
519 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
522 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
525 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
528 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
531 dw_pcie_writel_rc(pp, val, PCIE_LINK_WIDTH_SPEED_CONTROL);
534 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_0);
535 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_1);
537 /* setup interrupt pins */
538 dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE, &val);
541 dw_pcie_writel_rc(pp, val, PCI_INTERRUPT_LINE);
543 /* setup bus numbers */
544 dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS, &val);
547 dw_pcie_writel_rc(pp, val, PCI_PRIMARY_BUS);
549 /* setup memory base, memory limit */
550 membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
551 memlimit = (config->mem_size + (u32)pp->mem_base) & 0xfff00000;
552 val = memlimit | membase;
553 dw_pcie_writel_rc(pp, val, PCI_MEMORY_BASE);
555 /* setup command register */
556 dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
558 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
559 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
560 dw_pcie_writel_rc(pp, val, PCI_COMMAND);
563 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
564 MODULE_DESCRIPTION("Designware PCIe host controller driver");
565 MODULE_LICENSE("GPL v2");