1 /*
2 * linux/arch/alpha/kernel/core_polaris.c
3 *
4 * POLARIS chip-specific code
5 */
6
7 #define __EXTERN_INLINE inline
8 #include <asm/io.h>
9 #include <asm/core_polaris.h>
10 #undef __EXTERN_INLINE
11
12 #include <linux/types.h>
13 #include <linux/pci.h>
14 #include <linux/sched.h>
15 #include <linux/init.h>
16
17 #include <asm/ptrace.h>
18
19 #include "proto.h"
20 #include "pci_impl.h"
21
22 /*
23 * BIOS32-style PCI interface:
24 */
25
26 #define DEBUG_CONFIG 0
27
28 #if DEBUG_CONFIG
29 # define DBG_CFG(args) printk args
30 #else
31 # define DBG_CFG(args)
32 #endif
33
34
35 /*
36 * Given a bus, device, and function number, compute resulting
37 * configuration space address. This is fairly straightforward
38 * on POLARIS, since the chip itself generates Type 0 or Type 1
39 * cycles automatically depending on the bus number (Bus 0 is
40 * hardwired to Type 0, all others are Type 1. Peer bridges
41 * are not supported).
42 *
43 * All types:
44 *
45 * 3 3 3 3|3 3 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
46 * 9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
47 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
48 * |1|1|1|1|1|0|0|1|1|1|1|1|1|1|1|0|B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|x|x|
49 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
50 *
51 * 23:16 bus number (8 bits = 128 possible buses)
52 * 15:11 Device number (5 bits)
53 * 10:8 function number
54 * 7:2 register number
55 *
56 * Notes:
57 * The function number selects which function of a multi-function device
58 * (e.g., scsi and ethernet).
59 *
60 * The register selects a DWORD (32 bit) register offset. Hence it
61 * doesn't get shifted by 2 bits as we want to "drop" the bottom two
62 * bits.
63 */
64
65 static int
mk_conf_addr(struct pci_bus * pbus,unsigned int device_fn,int where,unsigned long * pci_addr,u8 * type1)66 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
67 unsigned long *pci_addr, u8 *type1)
68 {
69 u8 bus = pbus->number;
70
71 *type1 = (bus == 0) ? 0 : 1;
72 *pci_addr = (bus << 16) | (device_fn << 8) | (where) |
73 POLARIS_DENSE_CONFIG_BASE;
74
75 DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x,"
76 " returning address 0x%p\n"
77 bus, device_fn, where, *pci_addr));
78
79 return 0;
80 }
81
82 static int
polaris_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)83 polaris_read_config(struct pci_bus *bus, unsigned int devfn, int where,
84 int size, u32 *value)
85 {
86 unsigned long addr;
87 unsigned char type1;
88
89 if (mk_conf_addr(bus, devfn, where, &addr, &type1))
90 return PCIBIOS_DEVICE_NOT_FOUND;
91
92 switch (size) {
93 case 1:
94 *value = __kernel_ldbu(*(vucp)addr);
95 break;
96 case 2:
97 *value = __kernel_ldwu(*(vusp)addr);
98 break;
99 case 4:
100 *value = *(vuip)addr;
101 break;
102 }
103
104 return PCIBIOS_SUCCESSFUL;
105 }
106
107
108 static int
polaris_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)109 polaris_write_config(struct pci_bus *bus, unsigned int devfn, int where,
110 int size, u32 value)
111 {
112 unsigned long addr;
113 unsigned char type1;
114
115 if (mk_conf_addr(bus, devfn, where, &addr, &type1))
116 return PCIBIOS_DEVICE_NOT_FOUND;
117
118 switch (size) {
119 case 1:
120 __kernel_stb(value, *(vucp)addr);
121 mb();
122 __kernel_ldbu(*(vucp)addr);
123 break;
124 case 2:
125 __kernel_stw(value, *(vusp)addr);
126 mb();
127 __kernel_ldwu(*(vusp)addr);
128 break;
129 case 4:
130 *(vuip)addr = value;
131 mb();
132 *(vuip)addr;
133 break;
134 }
135
136 return PCIBIOS_SUCCESSFUL;
137 }
138
139 struct pci_ops polaris_pci_ops =
140 {
141 .read = polaris_read_config,
142 .write = polaris_write_config,
143 };
144
145 void __init
polaris_init_arch(void)146 polaris_init_arch(void)
147 {
148 struct pci_controller *hose;
149
150 /* May need to initialize error reporting (see PCICTL0/1), but
151 * for now assume that the firmware has done the right thing
152 * already.
153 */
154 #if 0
155 printk("polaris_init_arch(): trusting firmware for setup\n");
156 #endif
157
158 /*
159 * Create our single hose.
160 */
161
162 pci_isa_hose = hose = alloc_pci_controller();
163 hose->io_space = &ioport_resource;
164 hose->mem_space = &iomem_resource;
165 hose->index = 0;
166
167 hose->sparse_mem_base = 0;
168 hose->dense_mem_base = POLARIS_DENSE_MEM_BASE - IDENT_ADDR;
169 hose->sparse_io_base = 0;
170 hose->dense_io_base = POLARIS_DENSE_IO_BASE - IDENT_ADDR;
171
172 hose->sg_isa = hose->sg_pci = NULL;
173
174 /* The I/O window is fixed at 2G @ 2G. */
175 __direct_map_base = 0x80000000;
176 __direct_map_size = 0x80000000;
177 }
178
179 static inline void
polaris_pci_clr_err(void)180 polaris_pci_clr_err(void)
181 {
182 *(vusp)POLARIS_W_STATUS;
183 /* Write 1's to settable bits to clear errors */
184 *(vusp)POLARIS_W_STATUS = 0x7800;
185 mb();
186 *(vusp)POLARIS_W_STATUS;
187 }
188
189 void
polaris_machine_check(unsigned long vector,unsigned long la_ptr)190 polaris_machine_check(unsigned long vector, unsigned long la_ptr)
191 {
192 /* Clear the error before any reporting. */
193 mb();
194 mb();
195 draina();
196 polaris_pci_clr_err();
197 wrmces(0x7);
198 mb();
199
200 process_mcheck_info(vector, la_ptr, "POLARIS",
201 mcheck_expected(0));
202 }
203