2 * Copyright (c) 2003-2012 Broadcom Corporation
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the Broadcom
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12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in
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22 * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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35 #include <linux/types.h>
36 #include <linux/pci.h>
37 #include <linux/kernel.h>
38 #include <linux/init.h>
39 #include <linux/msi.h>
41 #include <linux/irq.h>
42 #include <linux/irqdesc.h>
43 #include <linux/console.h>
47 #include <asm/netlogic/interrupt.h>
48 #include <asm/netlogic/haldefs.h>
49 #include <asm/netlogic/common.h>
50 #include <asm/netlogic/mips-extns.h>
52 #include <asm/netlogic/xlp-hal/iomap.h>
53 #include <asm/netlogic/xlp-hal/xlp.h>
54 #include <asm/netlogic/xlp-hal/pic.h>
55 #include <asm/netlogic/xlp-hal/pcibus.h>
56 #include <asm/netlogic/xlp-hal/bridge.h>
58 static void *pci_config_base;
60 #define pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
63 static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
70 if (cpu_is_xlp9xx()) {
71 /* be very careful on SoC buses */
72 if (bus->number == 0) {
73 /* Scan only existing nodes - uboot bug? */
74 if (PCI_SLOT(devfn) != 0 ||
75 !nlm_node_present(PCI_FUNC(devfn)))
77 } else if (bus->parent->number == 0) { /* SoC bus */
78 if (PCI_SLOT(devfn) == 0) /* b.0.0 hangs */
80 if (devfn == 44) /* b.5.4 hangs */
83 } else if (bus->number == 0 && PCI_SLOT(devfn) == 1 && where == 0x954) {
86 cfgaddr = (u32 *)(pci_config_base +
87 pci_cfg_addr(bus->number, devfn, where));
92 static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
97 cfgaddr = (u32 *)(pci_config_base +
98 pci_cfg_addr(bus->number, devfn, where & ~3));
102 static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
103 int where, int size, u32 *val)
107 if ((size == 2) && (where & 1))
108 return PCIBIOS_BAD_REGISTER_NUMBER;
109 else if ((size == 4) && (where & 3))
110 return PCIBIOS_BAD_REGISTER_NUMBER;
112 data = pci_cfg_read_32bit(bus, devfn, where);
115 *val = (data >> ((where & 3) << 3)) & 0xff;
117 *val = (data >> ((where & 3) << 3)) & 0xffff;
121 return PCIBIOS_SUCCESSFUL;
125 static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
126 int where, int size, u32 val)
130 if ((size == 2) && (where & 1))
131 return PCIBIOS_BAD_REGISTER_NUMBER;
132 else if ((size == 4) && (where & 3))
133 return PCIBIOS_BAD_REGISTER_NUMBER;
135 data = pci_cfg_read_32bit(bus, devfn, where);
138 data = (data & ~(0xff << ((where & 3) << 3))) |
139 (val << ((where & 3) << 3));
141 data = (data & ~(0xffff << ((where & 3) << 3))) |
142 (val << ((where & 3) << 3));
146 pci_cfg_write_32bit(bus, devfn, where, data);
148 return PCIBIOS_SUCCESSFUL;
151 struct pci_ops nlm_pci_ops = {
152 .read = nlm_pcibios_read,
153 .write = nlm_pcibios_write
156 static struct resource nlm_pci_mem_resource = {
157 .name = "XLP PCI MEM",
158 .start = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
160 .flags = IORESOURCE_MEM,
163 static struct resource nlm_pci_io_resource = {
164 .name = "XLP IO MEM",
165 .start = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
167 .flags = IORESOURCE_IO,
170 struct pci_controller nlm_pci_controller = {
172 .pci_ops = &nlm_pci_ops,
173 .mem_resource = &nlm_pci_mem_resource,
174 .mem_offset = 0x00000000UL,
175 .io_resource = &nlm_pci_io_resource,
176 .io_offset = 0x00000000UL,
179 struct pci_dev *xlp_get_pcie_link(const struct pci_dev *dev)
181 struct pci_bus *bus, *p;
185 if (cpu_is_xlp9xx()) {
186 /* find bus with grand parent number == 0 */
187 for (p = bus->parent; p && p->parent && p->parent->number != 0;
190 return (p && p->parent) ? bus->self : NULL;
192 /* Find the bridge on bus 0 */
193 for (p = bus->parent; p && p->number != 0; p = p->parent)
196 return p ? bus->self : NULL;
200 int xlp_socdev_to_node(const struct pci_dev *lnkdev)
203 return PCI_FUNC(lnkdev->bus->self->devfn);
205 return PCI_SLOT(lnkdev->devfn) / 8;
208 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
210 struct pci_dev *lnkdev;
214 * For XLP PCIe, there is an IRQ per Link, find out which
215 * link the device is on to assign interrupts
217 lnkdev = xlp_get_pcie_link(dev);
221 lnkfunc = PCI_FUNC(lnkdev->devfn);
222 node = xlp_socdev_to_node(lnkdev);
224 return nlm_irq_to_xirq(node, PIC_PCIE_LINK_LEGACY_IRQ(lnkfunc));
227 /* Do platform specific device initialization at pci_enable_device() time */
228 int pcibios_plat_dev_init(struct pci_dev *dev)
234 * If big-endian, enable hardware byteswap on the PCIe bridges.
235 * This will make both the SoC and PCIe devices behave consistently with
239 static void xlp_config_pci_bswap(int node, int link)
241 uint64_t nbubase, lnkbase;
244 nbubase = nlm_get_bridge_regbase(node);
245 lnkbase = nlm_get_pcie_base(node, link);
248 * Enable byte swap in hardware. Program each link's PCIe SWAP regions
249 * from the link's address ranges.
251 if (cpu_is_xlp9xx()) {
252 reg = nlm_read_bridge_reg(nbubase,
253 BRIDGE_9XX_PCIEMEM_BASE0 + link);
254 nlm_write_pci_reg(lnkbase, PCIE_9XX_BYTE_SWAP_MEM_BASE, reg);
256 reg = nlm_read_bridge_reg(nbubase,
257 BRIDGE_9XX_PCIEMEM_LIMIT0 + link);
258 nlm_write_pci_reg(lnkbase,
259 PCIE_9XX_BYTE_SWAP_MEM_LIM, reg | 0xfff);
261 reg = nlm_read_bridge_reg(nbubase,
262 BRIDGE_9XX_PCIEIO_BASE0 + link);
263 nlm_write_pci_reg(lnkbase, PCIE_9XX_BYTE_SWAP_IO_BASE, reg);
265 reg = nlm_read_bridge_reg(nbubase,
266 BRIDGE_9XX_PCIEIO_LIMIT0 + link);
267 nlm_write_pci_reg(lnkbase,
268 PCIE_9XX_BYTE_SWAP_IO_LIM, reg | 0xfff);
270 reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEMEM_BASE0 + link);
271 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_BASE, reg);
273 reg = nlm_read_bridge_reg(nbubase,
274 BRIDGE_PCIEMEM_LIMIT0 + link);
275 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_LIM, reg | 0xfff);
277 reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_BASE0 + link);
278 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_BASE, reg);
280 reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_LIMIT0 + link);
281 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
285 /* Swap configuration not needed in little-endian mode */
286 static inline void xlp_config_pci_bswap(int node, int link) {}
287 #endif /* __BIG_ENDIAN */
289 static int __init pcibios_init(void)
295 /* Firmware assigns PCI resources */
296 pci_set_flags(PCI_PROBE_ONLY);
297 pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);
299 /* Extend IO port for memory mapped io */
300 ioport_resource.start = 0;
301 ioport_resource.end = ~0;
303 for (n = 0; n < NLM_NR_NODES; n++) {
304 if (!nlm_node_present(n))
307 for (link = 0; link < PCIE_NLINKS; link++) {
308 pciebase = nlm_get_pcie_base(n, link);
309 if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
311 xlp_config_pci_bswap(n, link);
312 xlp_init_node_msi_irqs(n, link);
314 /* put in intpin and irq - u-boot does not */
315 reg = nlm_read_pci_reg(pciebase, 0xf);
317 reg |= (1 << 8) | PIC_PCIE_LINK_LEGACY_IRQ(link);
318 nlm_write_pci_reg(pciebase, 0xf, reg);
319 pr_info("XLP PCIe: Link %d-%d initialized.\n", n, link);
323 set_io_port_base(CKSEG1);
324 nlm_pci_controller.io_map_base = CKSEG1;
326 register_pci_controller(&nlm_pci_controller);
327 pr_info("XLP PCIe Controller %pR%pR.\n", &nlm_pci_io_resource,
328 &nlm_pci_mem_resource);
332 arch_initcall(pcibios_init);