1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/mach-dove/pcie.c
4 *
5 * PCIe functions for Marvell Dove 88AP510 SoC
6 */
7
8#include <linux/kernel.h>
9#include <linux/pci.h>
10#include <linux/clk.h>
11#include <video/vga.h>
12#include <asm/mach/pci.h>
13#include <asm/mach/arch.h>
14#include <asm/setup.h>
15#include <asm/delay.h>
16#include <plat/pcie.h>
17#include <plat/addr-map.h>
18#include "irqs.h"
19#include "bridge-regs.h"
20#include "common.h"
21
22struct pcie_port {
23 u8 index;
24 u8 root_bus_nr;
25 void __iomem *base;
26 spinlock_t conf_lock;
27 char mem_space_name[16];
28 struct resource res;
29};
30
31static struct pcie_port pcie_port[2];
32static int num_pcie_ports;
33
34
35static int __init dove_pcie_setup(int nr, struct pci_sys_data *sys)
36{
37 struct pcie_port *pp;
38 struct resource realio;
39
40 if (nr >= num_pcie_ports)
41 return 0;
42
43 pp = &pcie_port[nr];
44 sys->private_data = pp;
45 pp->root_bus_nr = sys->busnr;
46
47 /*
48 * Generic PCIe unit setup.
49 */
50 orion_pcie_set_local_bus_nr(pp->base, sys->busnr);
51
52 orion_pcie_setup(pp->base);
53
54 realio.start = sys->busnr * SZ_64K;
55 realio.end = realio.start + SZ_64K - 1;
56 pci_remap_iospace(res: &realio, phys_addr: pp->index == 0 ? DOVE_PCIE0_IO_PHYS_BASE :
57 DOVE_PCIE1_IO_PHYS_BASE);
58
59 /*
60 * IORESOURCE_MEM
61 */
62 snprintf(buf: pp->mem_space_name, size: sizeof(pp->mem_space_name),
63 fmt: "PCIe %d MEM", pp->index);
64 pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
65 pp->res.name = pp->mem_space_name;
66 if (pp->index == 0) {
67 pp->res.start = DOVE_PCIE0_MEM_PHYS_BASE;
68 pp->res.end = pp->res.start + DOVE_PCIE0_MEM_SIZE - 1;
69 } else {
70 pp->res.start = DOVE_PCIE1_MEM_PHYS_BASE;
71 pp->res.end = pp->res.start + DOVE_PCIE1_MEM_SIZE - 1;
72 }
73 pp->res.flags = IORESOURCE_MEM;
74 if (request_resource(root: &iomem_resource, new: &pp->res))
75 panic(fmt: "Request PCIe Memory resource failed\n");
76 pci_add_resource_offset(resources: &sys->resources, res: &pp->res, offset: sys->mem_offset);
77
78 return 1;
79}
80
81static int pcie_valid_config(struct pcie_port *pp, int bus, int dev)
82{
83 /*
84 * Don't go out when trying to access nonexisting devices
85 * on the local bus.
86 */
87 if (bus == pp->root_bus_nr && dev > 1)
88 return 0;
89
90 return 1;
91}
92
93static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
94 int size, u32 *val)
95{
96 struct pci_sys_data *sys = bus->sysdata;
97 struct pcie_port *pp = sys->private_data;
98 unsigned long flags;
99 int ret;
100
101 if (pcie_valid_config(pp, bus: bus->number, PCI_SLOT(devfn)) == 0) {
102 *val = 0xffffffff;
103 return PCIBIOS_DEVICE_NOT_FOUND;
104 }
105
106 spin_lock_irqsave(&pp->conf_lock, flags);
107 ret = orion_pcie_rd_conf(pp->base, bus, devfn, where, size, val);
108 spin_unlock_irqrestore(lock: &pp->conf_lock, flags);
109
110 return ret;
111}
112
113static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
114 int where, int size, u32 val)
115{
116 struct pci_sys_data *sys = bus->sysdata;
117 struct pcie_port *pp = sys->private_data;
118 unsigned long flags;
119 int ret;
120
121 if (pcie_valid_config(pp, bus: bus->number, PCI_SLOT(devfn)) == 0)
122 return PCIBIOS_DEVICE_NOT_FOUND;
123
124 spin_lock_irqsave(&pp->conf_lock, flags);
125 ret = orion_pcie_wr_conf(pp->base, bus, devfn, where, size, val);
126 spin_unlock_irqrestore(lock: &pp->conf_lock, flags);
127
128 return ret;
129}
130
131static struct pci_ops pcie_ops = {
132 .read = pcie_rd_conf,
133 .write = pcie_wr_conf,
134};
135
136/*
137 * The root complex has a hardwired class of PCI_CLASS_MEMORY_OTHER, when it
138 * is operating as a root complex this needs to be switched to
139 * PCI_CLASS_BRIDGE_HOST or Linux will errantly try to process the BAR's on
140 * the device. Decoding setup is handled by the orion code.
141 */
142static void rc_pci_fixup(struct pci_dev *dev)
143{
144 if (dev->bus->parent == NULL && dev->devfn == 0) {
145 struct resource *r;
146
147 dev->class &= 0xff;
148 dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
149 pci_dev_for_each_resource(dev, r) {
150 r->start = 0;
151 r->end = 0;
152 r->flags = 0;
153 }
154 }
155}
156DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
157
158static int __init
159dove_pcie_scan_bus(int nr, struct pci_host_bridge *bridge)
160{
161 struct pci_sys_data *sys = pci_host_bridge_priv(bridge);
162
163 if (nr >= num_pcie_ports) {
164 BUG();
165 return -EINVAL;
166 }
167
168 list_splice_init(list: &sys->resources, head: &bridge->windows);
169 bridge->dev.parent = NULL;
170 bridge->sysdata = sys;
171 bridge->busnr = sys->busnr;
172 bridge->ops = &pcie_ops;
173
174 return pci_scan_root_bus_bridge(bridge);
175}
176
177static int __init dove_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
178{
179 struct pci_sys_data *sys = dev->sysdata;
180 struct pcie_port *pp = sys->private_data;
181
182 return pp->index ? IRQ_DOVE_PCIE1 : IRQ_DOVE_PCIE0;
183}
184
185static struct hw_pci dove_pci __initdata = {
186 .nr_controllers = 2,
187 .setup = dove_pcie_setup,
188 .scan = dove_pcie_scan_bus,
189 .map_irq = dove_pcie_map_irq,
190};
191
192static void __init add_pcie_port(int index, void __iomem *base)
193{
194 printk(KERN_INFO "Dove PCIe port %d: ", index);
195
196 if (orion_pcie_link_up(base)) {
197 struct pcie_port *pp = &pcie_port[num_pcie_ports++];
198 struct clk *clk = clk_get_sys(dev_id: "pcie", con_id: (index ? "1" : "0"));
199
200 if (!IS_ERR(ptr: clk))
201 clk_prepare_enable(clk);
202
203 printk(KERN_INFO "link up\n");
204
205 pp->index = index;
206 pp->root_bus_nr = -1;
207 pp->base = base;
208 spin_lock_init(&pp->conf_lock);
209 memset(&pp->res, 0, sizeof(pp->res));
210 } else {
211 printk(KERN_INFO "link down, ignoring\n");
212 }
213}
214
215void __init dove_pcie_init(int init_port0, int init_port1)
216{
217 vga_base = DOVE_PCIE0_MEM_PHYS_BASE;
218
219 if (init_port0)
220 add_pcie_port(index: 0, DOVE_PCIE0_VIRT_BASE);
221
222 if (init_port1)
223 add_pcie_port(index: 1, DOVE_PCIE1_VIRT_BASE);
224
225 pci_common_init(&dove_pci);
226}
227

source code of linux/arch/arm/mach-dove/pcie.c