2 * Support for SCC external PCI
4 * (C) Copyright 2004-2007 TOSHIBA CORPORATION
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <linux/kernel.h>
24 #include <linux/threads.h>
25 #include <linux/pci.h>
26 #include <linux/init.h>
27 #include <linux/pci_regs.h>
32 #include <asm/pci-bridge.h>
33 #include <asm/ppc-pci.h>
35 #include "celleb_scc.h"
36 #include "celleb_pci.h"
38 #define MAX_PCI_DEVICES 32
39 #define MAX_PCI_FUNCTIONS 8
41 #define iob() __asm__ __volatile__("eieio; sync":::"memory")
43 static inline PCI_IO_ADDR celleb_epci_get_epci_base(
44 struct pci_controller *hose)
48 * Celleb epci uses cfg_addr as a base address for
49 * epci control registers.
52 return hose->cfg_addr;
55 static inline PCI_IO_ADDR celleb_epci_get_epci_cfg(
56 struct pci_controller *hose)
60 * Celleb epci uses cfg_data as a base address for
61 * configuration area for epci devices.
64 return hose->cfg_data;
67 static inline void clear_and_disable_master_abort_interrupt(
68 struct pci_controller *hose)
70 PCI_IO_ADDR epci_base;
72 epci_base = celleb_epci_get_epci_base(hose);
73 reg = epci_base + PCI_COMMAND;
74 out_be32(reg, in_be32(reg) | (PCI_STATUS_REC_MASTER_ABORT << 16));
77 static int celleb_epci_check_abort(struct pci_controller *hose,
81 PCI_IO_ADDR epci_base;
85 epci_base = celleb_epci_get_epci_base(hose);
87 reg = epci_base + PCI_COMMAND;
90 if (val & (PCI_STATUS_REC_MASTER_ABORT << 16)) {
92 (val & 0xffff) | (PCI_STATUS_REC_MASTER_ABORT << 16));
94 /* clear PCI Controller error, FRE, PMFE */
95 reg = epci_base + SCC_EPCI_STATUS;
96 out_be32(reg, SCC_EPCI_INT_PAI);
98 reg = epci_base + SCC_EPCI_VCSR;
99 val = in_be32(reg) & 0xffff;
100 val |= SCC_EPCI_VCSR_FRE;
103 reg = epci_base + SCC_EPCI_VISTAT;
104 out_be32(reg, SCC_EPCI_VISTAT_PMFE);
105 return PCIBIOS_DEVICE_NOT_FOUND;
108 return PCIBIOS_SUCCESSFUL;
111 static PCI_IO_ADDR celleb_epci_make_config_addr(struct pci_bus *bus,
112 struct pci_controller *hose, unsigned int devfn, int where)
116 if (bus != hose->bus)
117 addr = celleb_epci_get_epci_cfg(hose) +
118 (((bus->number & 0xff) << 16)
119 | ((devfn & 0xff) << 8)
123 addr = celleb_epci_get_epci_cfg(hose) +
124 (((devfn & 0xff) << 8) | (where & 0xff));
126 pr_debug("EPCI: config_addr = 0x%p\n", addr);
131 static int celleb_epci_read_config(struct pci_bus *bus,
132 unsigned int devfn, int where, int size, u32 *val)
134 PCI_IO_ADDR epci_base;
136 struct pci_controller *hose = pci_bus_to_host(bus);
138 /* allignment check */
139 BUG_ON(where % size);
141 if (!celleb_epci_get_epci_cfg(hose))
142 return PCIBIOS_DEVICE_NOT_FOUND;
144 if (bus->number == hose->first_busno && devfn == 0) {
145 /* EPCI controller self */
147 epci_base = celleb_epci_get_epci_base(hose);
148 addr = epci_base + where;
155 *val = in_be16(addr);
158 *val = in_be32(addr);
161 return PCIBIOS_DEVICE_NOT_FOUND;
166 clear_and_disable_master_abort_interrupt(hose);
167 addr = celleb_epci_make_config_addr(bus, hose, devfn, where);
174 *val = in_le16(addr);
177 *val = in_le32(addr);
180 return PCIBIOS_DEVICE_NOT_FOUND;
185 "addr=0x%p, devfn=0x%x, where=0x%x, size=0x%x, val=0x%x\n",
186 addr, devfn, where, size, *val);
188 return celleb_epci_check_abort(hose, NULL);
191 static int celleb_epci_write_config(struct pci_bus *bus,
192 unsigned int devfn, int where, int size, u32 val)
194 PCI_IO_ADDR epci_base;
196 struct pci_controller *hose = pci_bus_to_host(bus);
198 /* allignment check */
199 BUG_ON(where % size);
201 if (!celleb_epci_get_epci_cfg(hose))
202 return PCIBIOS_DEVICE_NOT_FOUND;
204 if (bus->number == hose->first_busno && devfn == 0) {
205 /* EPCI controller self */
207 epci_base = celleb_epci_get_epci_base(hose);
208 addr = epci_base + where;
221 return PCIBIOS_DEVICE_NOT_FOUND;
226 clear_and_disable_master_abort_interrupt(hose);
227 addr = celleb_epci_make_config_addr(bus, hose, devfn, where);
240 return PCIBIOS_DEVICE_NOT_FOUND;
244 return celleb_epci_check_abort(hose, addr);
247 struct pci_ops celleb_epci_ops = {
248 .read = celleb_epci_read_config,
249 .write = celleb_epci_write_config,
252 /* to be moved in FW */
253 static int __init celleb_epci_init(struct pci_controller *hose)
257 PCI_IO_ADDR epci_base;
260 epci_base = celleb_epci_get_epci_base(hose);
262 /* PCI core reset(Internal bus and PCI clock) */
263 reg = epci_base + SCC_EPCI_CKCTRL;
265 if (val == 0x00030101)
268 val &= ~(SCC_EPCI_CKCTRL_CRST0 | SCC_EPCI_CKCTRL_CRST1);
271 /* set PCI core clock */
273 val |= (SCC_EPCI_CKCTRL_OCLKEN | SCC_EPCI_CKCTRL_LCLKEN);
276 /* release PCI core reset (internal bus) */
278 val |= SCC_EPCI_CKCTRL_CRST0;
281 /* set PCI clock select */
282 reg = epci_base + SCC_EPCI_CLKRST;
284 val &= ~SCC_EPCI_CLKRST_CKS_MASK;
285 val |= SCC_EPCI_CLKRST_CKS_2;
289 reg = epci_base + SCC_EPCI_ABTSET;
290 out_be32(reg, 0x0f1f001f); /* temporary value */
293 reg = epci_base + SCC_EPCI_CLKRST;
295 val |= SCC_EPCI_CLKRST_BC;
298 /* PCI clock enable */
300 val |= SCC_EPCI_CLKRST_PCKEN;
303 /* release PCI core reset (all) */
304 reg = epci_base + SCC_EPCI_CKCTRL;
306 val |= (SCC_EPCI_CKCTRL_CRST0 | SCC_EPCI_CKCTRL_CRST1);
309 /* set base translation registers. (already set by Beat) */
311 /* set base address masks. (already set by Beat) */
314 /* release interrupt masks and clear all interrupts */
315 reg = epci_base + SCC_EPCI_INTSET;
316 out_be32(reg, 0x013f011f); /* all interrupts enable */
317 reg = epci_base + SCC_EPCI_VIENAB;
318 val = SCC_EPCI_VIENAB_PMPEE | SCC_EPCI_VIENAB_PMFEE;
320 reg = epci_base + SCC_EPCI_STATUS;
321 out_be32(reg, 0xffffffff);
322 reg = epci_base + SCC_EPCI_VISTAT;
323 out_be32(reg, 0xffffffff);
325 /* disable PCI->IB address translation */
326 reg = epci_base + SCC_EPCI_VCSR;
328 val &= ~(SCC_EPCI_VCSR_DR | SCC_EPCI_VCSR_AT);
331 /* set base addresses. (no need to set?) */
333 /* memory space, bus master enable */
334 reg = epci_base + PCI_COMMAND;
335 val = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
338 /* endian mode setup */
339 reg = epci_base + SCC_EPCI_ECMODE;
343 /* set control option */
344 reg = epci_base + SCC_EPCI_CNTOPT;
346 val |= SCC_EPCI_CNTOPT_O2PMB;
349 /* XXX: temporay: set registers for address conversion setup */
350 reg = epci_base + SCC_EPCI_CNF10_REG;
351 out_be32(reg, 0x80000008);
352 reg = epci_base + SCC_EPCI_CNF14_REG;
353 out_be32(reg, 0x40000008);
355 reg = epci_base + SCC_EPCI_BAM0;
356 out_be32(reg, 0x80000000);
357 reg = epci_base + SCC_EPCI_BAM1;
358 out_be32(reg, 0xe0000000);
360 reg = epci_base + SCC_EPCI_PVBAT;
361 out_be32(reg, 0x80000000);
364 /* release external PCI reset */
365 reg = epci_base + SCC_EPCI_CLKRST;
367 val |= SCC_EPCI_CLKRST_PCIRST;
374 static int __init celleb_setup_epci(struct device_node *node,
375 struct pci_controller *hose)
379 pr_debug("PCI: celleb_setup_epci()\n");
383 * Celleb epci uses cfg_addr and cfg_data member of
384 * pci_controller structure in irregular way.
386 * cfg_addr is used to map for control registers of
389 * cfg_data is used for configuration area of devices
390 * on Celleb epci buses.
393 if (of_address_to_resource(node, 0, &r))
395 hose->cfg_addr = ioremap(r.start, resource_size(&r));
398 pr_debug("EPCI: cfg_addr map 0x%016llx->0x%016lx + 0x%016llx\n",
399 r.start, (unsigned long)hose->cfg_addr, resource_size(&r));
401 if (of_address_to_resource(node, 2, &r))
403 hose->cfg_data = ioremap(r.start, resource_size(&r));
406 pr_debug("EPCI: cfg_data map 0x%016llx->0x%016lx + 0x%016llx\n",
407 r.start, (unsigned long)hose->cfg_data, resource_size(&r));
409 hose->ops = &celleb_epci_ops;
410 celleb_epci_init(hose);
416 iounmap(hose->cfg_addr);
419 iounmap(hose->cfg_data);
423 struct celleb_phb_spec celleb_epci_spec __initdata = {
424 .setup = celleb_setup_epci,
425 .ops = &spiderpci_ops,
426 .iowa_init = &spiderpci_iowa_init,
427 .iowa_data = (void *)0,