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authorChris Metcalf <cmetcalf@tilera.com>2010-11-02 12:05:10 -0400
committerChris Metcalf <cmetcalf@tilera.com>2010-11-24 13:13:49 -0500
commitf02cbbe657939489347cbda598401a56913ffcbd (patch)
tree0d21e68d899958e6549f908b0c715c6f37200027 /arch/tile
parente5a06939736277c54a68ae275433db55b99d187c (diff)
pci root complex: support for tile architecture
This change enables PCI root complex support for TILEPro. Unlike TILE-Gx, TILEPro has no support for memory-mapped I/O, so the PCI support consists of hypervisor upcalls for PIO, DMA, etc. However, the performance is fine for the devices we have tested with so far (1Gb Ethernet, SATA, etc.). The <asm/io.h> header was tweaked to be a little bit more aggressive about disabling attempts to map/unmap IO port space. The hacky <asm/pci-bridge.h> header was rolled into the <asm/pci.h> header and the result was simplified. Both of the latter two headers were preliminary versions not meant for release before now - oh well. There is one quirk for our TILEmpower platform, which accidentally negotiates up to 5GT and needs to be kicked down to 2.5GT. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile')
-rw-r--r--arch/tile/Kconfig12
-rw-r--r--arch/tile/include/asm/io.h15
-rw-r--r--arch/tile/include/asm/pci-bridge.h117
-rw-r--r--arch/tile/include/asm/pci.h107
-rw-r--r--arch/tile/kernel/Makefile1
-rw-r--r--arch/tile/kernel/pci.c621
6 files changed, 686 insertions, 187 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 07ec8a865c1d..e11b5fcb70eb 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -329,6 +329,18 @@ endmenu # Tilera-specific configuration
329 329
330menu "Bus options" 330menu "Bus options"
331 331
332config PCI
333 bool "PCI support"
334 default y
335 select PCI_DOMAINS
336 ---help---
337 Enable PCI root complex support, so PCIe endpoint devices can
338 be attached to the Tile chip. Many, but not all, PCI devices
339 are supported under Tilera's root complex driver.
340
341config PCI_DOMAINS
342 bool
343
332config NO_IOMEM 344config NO_IOMEM
333 def_bool !PCI 345 def_bool !PCI
334 346
diff --git a/arch/tile/include/asm/io.h b/arch/tile/include/asm/io.h
index ee43328713ab..d3cbb9b14cbe 100644
--- a/arch/tile/include/asm/io.h
+++ b/arch/tile/include/asm/io.h
@@ -55,9 +55,6 @@ extern void iounmap(volatile void __iomem *addr);
55#define ioremap_writethrough(physaddr, size) ioremap(physaddr, size) 55#define ioremap_writethrough(physaddr, size) ioremap(physaddr, size)
56#define ioremap_fullcache(physaddr, size) ioremap(physaddr, size) 56#define ioremap_fullcache(physaddr, size) ioremap(physaddr, size)
57 57
58void __iomem *ioport_map(unsigned long port, unsigned int len);
59extern inline void ioport_unmap(void __iomem *addr) {}
60
61#define mmiowb() 58#define mmiowb()
62 59
63/* Conversion between virtual and physical mappings. */ 60/* Conversion between virtual and physical mappings. */
@@ -189,12 +186,22 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
189 * we never run, uses them unconditionally. 186 * we never run, uses them unconditionally.
190 */ 187 */
191 188
192static inline int ioport_panic(void) 189static inline long ioport_panic(void)
193{ 190{
194 panic("inb/outb and friends do not exist on tile"); 191 panic("inb/outb and friends do not exist on tile");
195 return 0; 192 return 0;
196} 193}
197 194
195static inline void __iomem *ioport_map(unsigned long port, unsigned int len)
196{
197 return (void __iomem *) ioport_panic();
198}
199
200static inline void ioport_unmap(void __iomem *addr)
201{
202 ioport_panic();
203}
204
198static inline u8 inb(unsigned long addr) 205static inline u8 inb(unsigned long addr)
199{ 206{
200 return ioport_panic(); 207 return ioport_panic();
diff --git a/arch/tile/include/asm/pci-bridge.h b/arch/tile/include/asm/pci-bridge.h
deleted file mode 100644
index e853b0e2793b..000000000000
--- a/arch/tile/include/asm/pci-bridge.h
+++ /dev/null
@@ -1,117 +0,0 @@
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#ifndef _ASM_TILE_PCI_BRIDGE_H
16#define _ASM_TILE_PCI_BRIDGE_H
17
18#include <linux/ioport.h>
19#include <linux/pci.h>
20
21struct device_node;
22struct pci_controller;
23
24/*
25 * pci_io_base returns the memory address at which you can access
26 * the I/O space for PCI bus number `bus' (or NULL on error).
27 */
28extern void __iomem *pci_bus_io_base(unsigned int bus);
29extern unsigned long pci_bus_io_base_phys(unsigned int bus);
30extern unsigned long pci_bus_mem_base_phys(unsigned int bus);
31
32/* Allocate a new PCI host bridge structure */
33extern struct pci_controller *pcibios_alloc_controller(void);
34
35/* Helper function for setting up resources */
36extern void pci_init_resource(struct resource *res, unsigned long start,
37 unsigned long end, int flags, char *name);
38
39/* Get the PCI host controller for a bus */
40extern struct pci_controller *pci_bus_to_hose(int bus);
41
42/*
43 * Structure of a PCI controller (host bridge)
44 */
45struct pci_controller {
46 int index; /* PCI domain number */
47 struct pci_bus *root_bus;
48
49 int first_busno;
50 int last_busno;
51
52 int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */
53 int hv_mem_fd; /* fd to Hypervisor for MMIO operations */
54
55 struct pci_ops *ops;
56
57 int irq_base; /* Base IRQ from the Hypervisor */
58 int plx_gen1; /* flag for PLX Gen 1 configuration */
59
60 /* Address ranges that are routed to this controller/bridge. */
61 struct resource mem_resources[3];
62};
63
64static inline struct pci_controller *pci_bus_to_host(struct pci_bus *bus)
65{
66 return bus->sysdata;
67}
68
69extern void setup_indirect_pci_nomap(struct pci_controller *hose,
70 void __iomem *cfg_addr, void __iomem *cfg_data);
71extern void setup_indirect_pci(struct pci_controller *hose,
72 u32 cfg_addr, u32 cfg_data);
73extern void setup_grackle(struct pci_controller *hose);
74
75extern unsigned char common_swizzle(struct pci_dev *, unsigned char *);
76
77/*
78 * The following code swizzles for exactly one bridge. The routine
79 * common_swizzle below handles multiple bridges. But there are a
80 * some boards that don't follow the PCI spec's suggestion so we
81 * break this piece out separately.
82 */
83static inline unsigned char bridge_swizzle(unsigned char pin,
84 unsigned char idsel)
85{
86 return (((pin-1) + idsel) % 4) + 1;
87}
88
89/*
90 * The following macro is used to lookup irqs in a standard table
91 * format for those PPC systems that do not already have PCI
92 * interrupts properly routed.
93 */
94/* FIXME - double check this */
95#define PCI_IRQ_TABLE_LOOKUP ({ \
96 long _ctl_ = -1; \
97 if (idsel >= min_idsel && idsel <= max_idsel && pin <= irqs_per_slot) \
98 _ctl_ = pci_irq_table[idsel - min_idsel][pin-1]; \
99 _ctl_; \
100})
101
102/*
103 * Scan the buses below a given PCI host bridge and assign suitable
104 * resources to all devices found.
105 */
106extern int pciauto_bus_scan(struct pci_controller *, int);
107
108#ifdef CONFIG_PCI
109extern unsigned long pci_address_to_pio(phys_addr_t address);
110#else
111static inline unsigned long pci_address_to_pio(phys_addr_t address)
112{
113 return (unsigned long)-1;
114}
115#endif
116
117#endif /* _ASM_TILE_PCI_BRIDGE_H */
diff --git a/arch/tile/include/asm/pci.h b/arch/tile/include/asm/pci.h
index b0c15da2d5d5..c3fc458a0d32 100644
--- a/arch/tile/include/asm/pci.h
+++ b/arch/tile/include/asm/pci.h
@@ -15,7 +15,29 @@
15#ifndef _ASM_TILE_PCI_H 15#ifndef _ASM_TILE_PCI_H
16#define _ASM_TILE_PCI_H 16#define _ASM_TILE_PCI_H
17 17
18#include <asm/pci-bridge.h> 18#include <linux/pci.h>
19
20/*
21 * Structure of a PCI controller (host bridge)
22 */
23struct pci_controller {
24 int index; /* PCI domain number */
25 struct pci_bus *root_bus;
26
27 int first_busno;
28 int last_busno;
29
30 int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */
31 int hv_mem_fd; /* fd to Hypervisor for MMIO operations */
32
33 struct pci_ops *ops;
34
35 int irq_base; /* Base IRQ from the Hypervisor */
36 int plx_gen1; /* flag for PLX Gen 1 configuration */
37
38 /* Address ranges that are routed to this controller/bridge. */
39 struct resource mem_resources[3];
40};
19 41
20/* 42/*
21 * The hypervisor maps the entirety of CPA-space as bus addresses, so 43 * The hypervisor maps the entirety of CPA-space as bus addresses, so
@@ -24,56 +46,12 @@
24 */ 46 */
25#define PCI_DMA_BUS_IS_PHYS 1 47#define PCI_DMA_BUS_IS_PHYS 1
26 48
27struct pci_controller *pci_bus_to_hose(int bus);
28unsigned char __init common_swizzle(struct pci_dev *dev, unsigned char *pinp);
29int __init tile_pci_init(void); 49int __init tile_pci_init(void);
30void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
31void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
32void __devinit pcibios_fixup_bus(struct pci_bus *bus);
33 50
34int __devinit _tile_cfg_read(struct pci_controller *hose, 51void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
35 int bus, 52static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
36 int slot,
37 int function,
38 int offset,
39 int size,
40 u32 *val);
41int __devinit _tile_cfg_write(struct pci_controller *hose,
42 int bus,
43 int slot,
44 int function,
45 int offset,
46 int size,
47 u32 val);
48 53
49/* 54void __devinit pcibios_fixup_bus(struct pci_bus *bus);
50 * These are used to to config reads and writes in the early stages of
51 * setup before the driver infrastructure has been set up enough to be
52 * able to do config reads and writes.
53 */
54#define early_cfg_read(where, size, value) \
55 _tile_cfg_read(controller, \
56 current_bus, \
57 pci_slot, \
58 pci_fn, \
59 where, \
60 size, \
61 value)
62
63#define early_cfg_write(where, size, value) \
64 _tile_cfg_write(controller, \
65 current_bus, \
66 pci_slot, \
67 pci_fn, \
68 where, \
69 size, \
70 value)
71
72
73
74#define PCICFG_BYTE 1
75#define PCICFG_WORD 2
76#define PCICFG_DWORD 4
77 55
78#define TILE_NUM_PCIE 2 56#define TILE_NUM_PCIE 2
79 57
@@ -88,33 +66,33 @@ static inline int pci_proc_domain(struct pci_bus *bus)
88} 66}
89 67
90/* 68/*
91 * I/O space is currently not supported. 69 * pcibios_assign_all_busses() tells whether or not the bus numbers
70 * should be reassigned, in case the BIOS didn't do it correctly, or
71 * in case we don't have a BIOS and we want to let Linux do it.
92 */ 72 */
73static inline int pcibios_assign_all_busses(void)
74{
75 return 1;
76}
93 77
94#define TILE_PCIE_LOWER_IO 0x0 78/*
95#define TILE_PCIE_UPPER_IO 0x10000 79 * No special bus mastering setup handling.
96#define TILE_PCIE_PCIE_IO_SIZE 0x0000FFFF 80 */
97
98#define _PAGE_NO_CACHE 0
99#define _PAGE_GUARDED 0
100
101
102#define pcibios_assign_all_busses() pci_assign_all_buses
103extern int pci_assign_all_buses;
104
105static inline void pcibios_set_master(struct pci_dev *dev) 81static inline void pcibios_set_master(struct pci_dev *dev)
106{ 82{
107 /* No special bus mastering setup handling */
108} 83}
109 84
110#define PCIBIOS_MIN_MEM 0 85#define PCIBIOS_MIN_MEM 0
111#define PCIBIOS_MIN_IO TILE_PCIE_LOWER_IO 86#define PCIBIOS_MIN_IO 0
112 87
113/* 88/*
114 * This flag tells if the platform is TILEmpower that needs 89 * This flag tells if the platform is TILEmpower that needs
115 * special configuration for the PLX switch chip. 90 * special configuration for the PLX switch chip.
116 */ 91 */
117extern int blade_pci; 92extern int tile_plx_gen1;
93
94/* Use any cpu for PCI. */
95#define cpumask_of_pcibus(bus) cpu_online_mask
118 96
119/* implement the pci_ DMA API in terms of the generic device dma_ one */ 97/* implement the pci_ DMA API in terms of the generic device dma_ one */
120#include <asm-generic/pci-dma-compat.h> 98#include <asm-generic/pci-dma-compat.h>
@@ -122,7 +100,4 @@ extern int blade_pci;
122/* generic pci stuff */ 100/* generic pci stuff */
123#include <asm-generic/pci.h> 101#include <asm-generic/pci.h>
124 102
125/* Use any cpu for PCI. */
126#define cpumask_of_pcibus(bus) cpu_online_mask
127
128#endif /* _ASM_TILE_PCI_H */ 103#endif /* _ASM_TILE_PCI_H */
diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index 112b1e248f05..b4c8e8ec45dc 100644
--- a/arch/tile/kernel/Makefile
+++ b/arch/tile/kernel/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_SMP) += smpboot.o smp.o tlb.o
15obj-$(CONFIG_MODULES) += module.o 15obj-$(CONFIG_MODULES) += module.o
16obj-$(CONFIG_EARLY_PRINTK) += early_printk.o 16obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
17obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o 17obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
18obj-$(CONFIG_PCI) += pci.o
diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
new file mode 100644
index 000000000000..a1ee25be9ad9
--- /dev/null
+++ b/arch/tile/kernel/pci.c
@@ -0,0 +1,621 @@
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#include <linux/kernel.h>
16#include <linux/pci.h>
17#include <linux/delay.h>
18#include <linux/string.h>
19#include <linux/init.h>
20#include <linux/capability.h>
21#include <linux/sched.h>
22#include <linux/errno.h>
23#include <linux/bootmem.h>
24#include <linux/irq.h>
25#include <linux/io.h>
26#include <linux/uaccess.h>
27
28#include <asm/processor.h>
29#include <asm/sections.h>
30#include <asm/byteorder.h>
31#include <asm/hv_driver.h>
32#include <hv/drv_pcie_rc_intf.h>
33
34
35/*
36 * Initialization flow and process
37 * -------------------------------
38 *
39 * This files containes the routines to search for PCI buses,
40 * enumerate the buses, and configure any attached devices.
41 *
42 * There are two entry points here:
43 * 1) tile_pci_init
44 * This sets up the pci_controller structs, and opens the
45 * FDs to the hypervisor. This is called from setup_arch() early
46 * in the boot process.
47 * 2) pcibios_init
48 * This probes the PCI bus(es) for any attached hardware. It's
49 * called by subsys_initcall. All of the real work is done by the
50 * generic Linux PCI layer.
51 *
52 */
53
54/*
55 * This flag tells if the platform is TILEmpower that needs
56 * special configuration for the PLX switch chip.
57 */
58int __write_once tile_plx_gen1;
59
60static struct pci_controller controllers[TILE_NUM_PCIE];
61static int num_controllers;
62
63static struct pci_ops tile_cfg_ops;
64
65
66/*
67 * We don't need to worry about the alignment of resources.
68 */
69resource_size_t pcibios_align_resource(void *data, const struct resource *res,
70 resource_size_t size, resource_size_t align)
71{
72 return res->start;
73}
74EXPORT_SYMBOL(pcibios_align_resource);
75
76/*
77 * Open a FD to the hypervisor PCI device.
78 *
79 * controller_id is the controller number, config type is 0 or 1 for
80 * config0 or config1 operations.
81 */
82static int __init tile_pcie_open(int controller_id, int config_type)
83{
84 char filename[32];
85 int fd;
86
87 sprintf(filename, "pcie/%d/config%d", controller_id, config_type);
88
89 fd = hv_dev_open((HV_VirtAddr)filename, 0);
90
91 return fd;
92}
93
94
95/*
96 * Get the IRQ numbers from the HV and set up the handlers for them.
97 */
98static int __init tile_init_irqs(int controller_id,
99 struct pci_controller *controller)
100{
101 char filename[32];
102 int fd;
103 int ret;
104 int x;
105 struct pcie_rc_config rc_config;
106
107 sprintf(filename, "pcie/%d/ctl", controller_id);
108 fd = hv_dev_open((HV_VirtAddr)filename, 0);
109 if (fd < 0) {
110 pr_err("PCI: hv_dev_open(%s) failed\n", filename);
111 return -1;
112 }
113 ret = hv_dev_pread(fd, 0, (HV_VirtAddr)(&rc_config),
114 sizeof(rc_config), PCIE_RC_CONFIG_MASK_OFF);
115 hv_dev_close(fd);
116 if (ret != sizeof(rc_config)) {
117 pr_err("PCI: wanted %zd bytes, got %d\n",
118 sizeof(rc_config), ret);
119 return -1;
120 }
121 /* Record irq_base so that we can map INTx to IRQ # later. */
122 controller->irq_base = rc_config.intr;
123
124 for (x = 0; x < 4; x++)
125 tile_irq_activate(rc_config.intr + x,
126 TILE_IRQ_HW_CLEAR);
127
128 if (rc_config.plx_gen1)
129 controller->plx_gen1 = 1;
130
131 return 0;
132}
133
134/*
135 * First initialization entry point, called from setup_arch().
136 *
137 * Find valid controllers and fill in pci_controller structs for each
138 * of them.
139 *
140 * Returns the number of controllers discovered.
141 */
142int __init tile_pci_init(void)
143{
144 int i;
145
146 pr_info("PCI: Searching for controllers...\n");
147
148 /* Do any configuration we need before using the PCIe */
149
150 for (i = 0; i < TILE_NUM_PCIE; i++) {
151 int hv_cfg_fd0 = -1;
152 int hv_cfg_fd1 = -1;
153 int hv_mem_fd = -1;
154 char name[32];
155 struct pci_controller *controller;
156
157 /*
158 * Open the fd to the HV. If it fails then this
159 * device doesn't exist.
160 */
161 hv_cfg_fd0 = tile_pcie_open(i, 0);
162 if (hv_cfg_fd0 < 0)
163 continue;
164 hv_cfg_fd1 = tile_pcie_open(i, 1);
165 if (hv_cfg_fd1 < 0) {
166 pr_err("PCI: Couldn't open config fd to HV "
167 "for controller %d\n", i);
168 goto err_cont;
169 }
170
171 sprintf(name, "pcie/%d/mem", i);
172 hv_mem_fd = hv_dev_open((HV_VirtAddr)name, 0);
173 if (hv_mem_fd < 0) {
174 pr_err("PCI: Could not open mem fd to HV!\n");
175 goto err_cont;
176 }
177
178 pr_info("PCI: Found PCI controller #%d\n", i);
179
180 controller = &controllers[num_controllers];
181
182 if (tile_init_irqs(i, controller)) {
183 pr_err("PCI: Could not initialize "
184 "IRQs, aborting.\n");
185 goto err_cont;
186 }
187
188 controller->index = num_controllers;
189 controller->hv_cfg_fd[0] = hv_cfg_fd0;
190 controller->hv_cfg_fd[1] = hv_cfg_fd1;
191 controller->hv_mem_fd = hv_mem_fd;
192 controller->first_busno = 0;
193 controller->last_busno = 0xff;
194 controller->ops = &tile_cfg_ops;
195
196 num_controllers++;
197 continue;
198
199err_cont:
200 if (hv_cfg_fd0 >= 0)
201 hv_dev_close(hv_cfg_fd0);
202 if (hv_cfg_fd1 >= 0)
203 hv_dev_close(hv_cfg_fd1);
204 if (hv_mem_fd >= 0)
205 hv_dev_close(hv_mem_fd);
206 continue;
207 }
208
209 /*
210 * Before using the PCIe, see if we need to do any platform-specific
211 * configuration, such as the PLX switch Gen 1 issue on TILEmpower.
212 */
213 for (i = 0; i < num_controllers; i++) {
214 struct pci_controller *controller = &controllers[i];
215
216 if (controller->plx_gen1)
217 tile_plx_gen1 = 1;
218 }
219
220 return num_controllers;
221}
222
223/*
224 * (pin - 1) converts from the PCI standard's [1:4] convention to
225 * a normal [0:3] range.
226 */
227static int tile_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
228{
229 struct pci_controller *controller =
230 (struct pci_controller *)dev->sysdata;
231 return (pin - 1) + controller->irq_base;
232}
233
234
235static void __init fixup_read_and_payload_sizes(void)
236{
237 struct pci_dev *dev = NULL;
238 int smallest_max_payload = 0x1; /* Tile maxes out at 256 bytes. */
239 int max_read_size = 0x2; /* Limit to 512 byte reads. */
240 u16 new_values;
241
242 /* Scan for the smallest maximum payload size. */
243 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
244 int pcie_caps_offset;
245 u32 devcap;
246 int max_payload;
247
248 pcie_caps_offset = pci_find_capability(dev, PCI_CAP_ID_EXP);
249 if (pcie_caps_offset == 0)
250 continue;
251
252 pci_read_config_dword(dev, pcie_caps_offset + PCI_EXP_DEVCAP,
253 &devcap);
254 max_payload = devcap & PCI_EXP_DEVCAP_PAYLOAD;
255 if (max_payload < smallest_max_payload)
256 smallest_max_payload = max_payload;
257 }
258
259 /* Now, set the max_payload_size for all devices to that value. */
260 new_values = (max_read_size << 12) | (smallest_max_payload << 5);
261 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
262 int pcie_caps_offset;
263 u16 devctl;
264
265 pcie_caps_offset = pci_find_capability(dev, PCI_CAP_ID_EXP);
266 if (pcie_caps_offset == 0)
267 continue;
268
269 pci_read_config_word(dev, pcie_caps_offset + PCI_EXP_DEVCTL,
270 &devctl);
271 devctl &= ~(PCI_EXP_DEVCTL_PAYLOAD | PCI_EXP_DEVCTL_READRQ);
272 devctl |= new_values;
273 pci_write_config_word(dev, pcie_caps_offset + PCI_EXP_DEVCTL,
274 devctl);
275 }
276}
277
278
279/*
280 * Second PCI initialization entry point, called by subsys_initcall.
281 *
282 * The controllers have been set up by the time we get here, by a call to
283 * tile_pci_init.
284 */
285static int __init pcibios_init(void)
286{
287 int i;
288
289 pr_info("PCI: Probing PCI hardware\n");
290
291 /*
292 * Delay a bit in case devices aren't ready. Some devices are
293 * known to require at least 20ms here, but we use a more
294 * conservative value.
295 */
296 mdelay(250);
297
298 /* Scan all of the recorded PCI controllers. */
299 for (i = 0; i < num_controllers; i++) {
300 struct pci_controller *controller = &controllers[i];
301 struct pci_bus *bus;
302
303 pr_info("PCI: initializing controller #%d\n", i);
304
305 /*
306 * This comes from the generic Linux PCI driver.
307 *
308 * It reads the PCI tree for this bus into the Linux
309 * data structures.
310 *
311 * This is inlined in linux/pci.h and calls into
312 * pci_scan_bus_parented() in probe.c.
313 */
314 bus = pci_scan_bus(0, controller->ops, controller);
315 controller->root_bus = bus;
316 controller->last_busno = bus->subordinate;
317
318 }
319
320 /* Do machine dependent PCI interrupt routing */
321 pci_fixup_irqs(pci_common_swizzle, tile_map_irq);
322
323 /*
324 * This comes from the generic Linux PCI driver.
325 *
326 * It allocates all of the resources (I/O memory, etc)
327 * associated with the devices read in above.
328 */
329
330 pci_assign_unassigned_resources();
331
332 /* Configure the max_read_size and max_payload_size values. */
333 fixup_read_and_payload_sizes();
334
335 /* Record the I/O resources in the PCI controller structure. */
336 for (i = 0; i < num_controllers; i++) {
337 struct pci_bus *root_bus = controllers[i].root_bus;
338 struct pci_bus *next_bus;
339 struct pci_dev *dev;
340
341 list_for_each_entry(dev, &root_bus->devices, bus_list) {
342 /* Find the PCI host controller, ie. the 1st bridge. */
343 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
344 (PCI_SLOT(dev->devfn) == 0)) {
345 next_bus = dev->subordinate;
346 controllers[i].mem_resources[0] =
347 *next_bus->resource[0];
348 controllers[i].mem_resources[1] =
349 *next_bus->resource[1];
350 controllers[i].mem_resources[2] =
351 *next_bus->resource[2];
352
353 break;
354 }
355 }
356
357 }
358
359 return 0;
360}
361subsys_initcall(pcibios_init);
362
363/*
364 * No bus fixups needed.
365 */
366void __devinit pcibios_fixup_bus(struct pci_bus *bus)
367{
368 /* Nothing needs to be done. */
369}
370
371/*
372 * This can be called from the generic PCI layer, but doesn't need to
373 * do anything.
374 */
375char __devinit *pcibios_setup(char *str)
376{
377 /* Nothing needs to be done. */
378 return str;
379}
380
381/*
382 * This is called from the generic Linux layer.
383 */
384void __init pcibios_update_irq(struct pci_dev *dev, int irq)
385{
386 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
387}
388
389/*
390 * Enable memory and/or address decoding, as appropriate, for the
391 * device described by the 'dev' struct.
392 *
393 * This is called from the generic PCI layer, and can be called
394 * for bridges or endpoints.
395 */
396int pcibios_enable_device(struct pci_dev *dev, int mask)
397{
398 u16 cmd, old_cmd;
399 u8 header_type;
400 int i;
401 struct resource *r;
402
403 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
404
405 pci_read_config_word(dev, PCI_COMMAND, &cmd);
406 old_cmd = cmd;
407 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
408 /*
409 * For bridges, we enable both memory and I/O decoding
410 * in call cases.
411 */
412 cmd |= PCI_COMMAND_IO;
413 cmd |= PCI_COMMAND_MEMORY;
414 } else {
415 /*
416 * For endpoints, we enable memory and/or I/O decoding
417 * only if they have a memory resource of that type.
418 */
419 for (i = 0; i < 6; i++) {
420 r = &dev->resource[i];
421 if (r->flags & IORESOURCE_UNSET) {
422 pr_err("PCI: Device %s not available "
423 "because of resource collisions\n",
424 pci_name(dev));
425 return -EINVAL;
426 }
427 if (r->flags & IORESOURCE_IO)
428 cmd |= PCI_COMMAND_IO;
429 if (r->flags & IORESOURCE_MEM)
430 cmd |= PCI_COMMAND_MEMORY;
431 }
432 }
433
434 /*
435 * We only write the command if it changed.
436 */
437 if (cmd != old_cmd)
438 pci_write_config_word(dev, PCI_COMMAND, cmd);
439 return 0;
440}
441
442void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
443{
444 unsigned long start = pci_resource_start(dev, bar);
445 unsigned long len = pci_resource_len(dev, bar);
446 unsigned long flags = pci_resource_flags(dev, bar);
447
448 if (!len)
449 return NULL;
450 if (max && len > max)
451 len = max;
452
453 if (!(flags & IORESOURCE_MEM)) {
454 pr_info("PCI: Trying to map invalid resource %#lx\n", flags);
455 start = 0;
456 }
457
458 return (void __iomem *)start;
459}
460EXPORT_SYMBOL(pci_iomap);
461
462
463/****************************************************************
464 *
465 * Tile PCI config space read/write routines
466 *
467 ****************************************************************/
468
469/*
470 * These are the normal read and write ops
471 * These are expanded with macros from pci_bus_read_config_byte() etc.
472 *
473 * devfn is the combined PCI slot & function.
474 *
475 * offset is in bytes, from the start of config space for the
476 * specified bus & slot.
477 */
478
479static int __devinit tile_cfg_read(struct pci_bus *bus,
480 unsigned int devfn,
481 int offset,
482 int size,
483 u32 *val)
484{
485 struct pci_controller *controller = bus->sysdata;
486 int busnum = bus->number & 0xff;
487 int slot = (devfn >> 3) & 0x1f;
488 int function = devfn & 0x7;
489 u32 addr;
490 int config_mode = 1;
491
492 /*
493 * There is no bridge between the Tile and bus 0, so we
494 * use config0 to talk to bus 0.
495 *
496 * If we're talking to a bus other than zero then we
497 * must have found a bridge.
498 */
499 if (busnum == 0) {
500 /*
501 * We fake an empty slot for (busnum == 0) && (slot > 0),
502 * since there is only one slot on bus 0.
503 */
504 if (slot) {
505 *val = 0xFFFFFFFF;
506 return 0;
507 }
508 config_mode = 0;
509 }
510
511 addr = busnum << 20; /* Bus in 27:20 */
512 addr |= slot << 15; /* Slot (device) in 19:15 */
513 addr |= function << 12; /* Function is in 14:12 */
514 addr |= (offset & 0xFFF); /* byte address in 0:11 */
515
516 return hv_dev_pread(controller->hv_cfg_fd[config_mode], 0,
517 (HV_VirtAddr)(val), size, addr);
518}
519
520
521/*
522 * See tile_cfg_read() for relevent comments.
523 * Note that "val" is the value to write, not a pointer to that value.
524 */
525static int __devinit tile_cfg_write(struct pci_bus *bus,
526 unsigned int devfn,
527 int offset,
528 int size,
529 u32 val)
530{
531 struct pci_controller *controller = bus->sysdata;
532 int busnum = bus->number & 0xff;
533 int slot = (devfn >> 3) & 0x1f;
534 int function = devfn & 0x7;
535 u32 addr;
536 int config_mode = 1;
537 HV_VirtAddr valp = (HV_VirtAddr)&val;
538
539 /*
540 * For bus 0 slot 0 we use config 0 accesses.
541 */
542 if (busnum == 0) {
543 /*
544 * We fake an empty slot for (busnum == 0) && (slot > 0),
545 * since there is only one slot on bus 0.
546 */
547 if (slot)
548 return 0;
549 config_mode = 0;
550 }
551
552 addr = busnum << 20; /* Bus in 27:20 */
553 addr |= slot << 15; /* Slot (device) in 19:15 */
554 addr |= function << 12; /* Function is in 14:12 */
555 addr |= (offset & 0xFFF); /* byte address in 0:11 */
556
557#ifdef __BIG_ENDIAN
558 /* Point to the correct part of the 32-bit "val". */
559 valp += 4 - size;
560#endif
561
562 return hv_dev_pwrite(controller->hv_cfg_fd[config_mode], 0,
563 valp, size, addr);
564}
565
566
567static struct pci_ops tile_cfg_ops = {
568 .read = tile_cfg_read,
569 .write = tile_cfg_write,
570};
571
572
573/*
574 * In the following, each PCI controller's mem_resources[1]
575 * represents its (non-prefetchable) PCI memory resource.
576 * mem_resources[0] and mem_resources[2] refer to its PCI I/O and
577 * prefetchable PCI memory resources, respectively.
578 * For more details, see pci_setup_bridge() in setup-bus.c.
579 * By comparing the target PCI memory address against the
580 * end address of controller 0, we can determine the controller
581 * that should accept the PCI memory access.
582 */
583#define TILE_READ(size, type) \
584type _tile_read##size(unsigned long addr) \
585{ \
586 type val; \
587 int idx = 0; \
588 if (addr > controllers[0].mem_resources[1].end && \
589 addr > controllers[0].mem_resources[2].end) \
590 idx = 1; \
591 if (hv_dev_pread(controllers[idx].hv_mem_fd, 0, \
592 (HV_VirtAddr)(&val), sizeof(type), addr)) \
593 pr_err("PCI: read %zd bytes at 0x%lX failed\n", \
594 sizeof(type), addr); \
595 return val; \
596} \
597EXPORT_SYMBOL(_tile_read##size)
598
599TILE_READ(b, u8);
600TILE_READ(w, u16);
601TILE_READ(l, u32);
602TILE_READ(q, u64);
603
604#define TILE_WRITE(size, type) \
605void _tile_write##size(type val, unsigned long addr) \
606{ \
607 int idx = 0; \
608 if (addr > controllers[0].mem_resources[1].end && \
609 addr > controllers[0].mem_resources[2].end) \
610 idx = 1; \
611 if (hv_dev_pwrite(controllers[idx].hv_mem_fd, 0, \
612 (HV_VirtAddr)(&val), sizeof(type), addr)) \
613 pr_err("PCI: write %zd bytes at 0x%lX failed\n", \
614 sizeof(type), addr); \
615} \
616EXPORT_SYMBOL(_tile_write##size)
617
618TILE_WRITE(b, u8);
619TILE_WRITE(w, u16);
620TILE_WRITE(l, u32);
621TILE_WRITE(q, u64);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 14:47:47 -0500