2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
16 #include "pci-bcm63xx.h"
19 * swizzle 32bits data to return only the needed part
21 static int postprocess_read(u32 data, int where, unsigned int size)
28 ret = (data >> ((where & 3) << 3)) & 0xff;
31 ret = (data >> ((where & 3) << 3)) & 0xffff;
40 static int preprocess_write(u32 orig_data, u32 val, int where,
48 ret = (orig_data & ~(0xff << ((where & 3) << 3))) |
49 (val << ((where & 3) << 3));
52 ret = (orig_data & ~(0xffff << ((where & 3) << 3))) |
53 (val << ((where & 3) << 3));
63 * setup hardware for a configuration cycle with given parameters
65 static int bcm63xx_setup_cfg_access(int type, unsigned int busn,
66 unsigned int devfn, int where)
68 unsigned int slot, func, reg;
71 slot = PCI_SLOT(devfn);
72 func = PCI_FUNC(devfn);
76 if (slot > (MPI_L2PCFG_DEVNUM_MASK >> MPI_L2PCFG_DEVNUM_SHIFT))
79 if (func > (MPI_L2PCFG_FUNC_MASK >> MPI_L2PCFG_FUNC_SHIFT))
82 if (reg > (MPI_L2PCFG_REG_MASK >> MPI_L2PCFG_REG_SHIFT))
85 /* ok, setup config access */
86 val = (reg << MPI_L2PCFG_REG_SHIFT);
87 val |= (func << MPI_L2PCFG_FUNC_SHIFT);
88 val |= (slot << MPI_L2PCFG_DEVNUM_SHIFT);
89 val |= MPI_L2PCFG_CFG_USEREG_MASK;
90 val |= MPI_L2PCFG_CFG_SEL_MASK;
91 /* type 0 cycle for local bus, type 1 cycle for anything else */
93 /* FIXME: how to specify bus ??? */
94 val |= (1 << MPI_L2PCFG_CFG_TYPE_SHIFT);
96 bcm_mpi_writel(val, MPI_L2PCFG_REG);
101 static int bcm63xx_do_cfg_read(int type, unsigned int busn,
102 unsigned int devfn, int where, int size,
107 /* two phase cycle, first we write address, then read data at
108 * another location, caller already has a spinlock so no need
110 if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
111 return PCIBIOS_DEVICE_NOT_FOUND;
113 data = le32_to_cpu(__raw_readl(pci_iospace_start));
114 /* restore IO space normal behaviour */
115 bcm_mpi_writel(0, MPI_L2PCFG_REG);
117 *val = postprocess_read(data, where, size);
119 return PCIBIOS_SUCCESSFUL;
122 static int bcm63xx_do_cfg_write(int type, unsigned int busn,
123 unsigned int devfn, int where, int size,
128 /* two phase cycle, first we write address, then write data to
129 * another location, caller already has a spinlock so no need
131 if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
132 return PCIBIOS_DEVICE_NOT_FOUND;
135 data = le32_to_cpu(__raw_readl(pci_iospace_start));
136 data = preprocess_write(data, val, where, size);
138 __raw_writel(cpu_to_le32(data), pci_iospace_start);
140 /* no way to know the access is done, we have to wait */
142 /* restore IO space normal behaviour */
143 bcm_mpi_writel(0, MPI_L2PCFG_REG);
145 return PCIBIOS_SUCCESSFUL;
148 static int bcm63xx_pci_read(struct pci_bus *bus, unsigned int devfn,
149 int where, int size, u32 *val)
153 type = bus->parent ? 1 : 0;
155 if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
156 return PCIBIOS_DEVICE_NOT_FOUND;
158 return bcm63xx_do_cfg_read(type, bus->number, devfn,
162 static int bcm63xx_pci_write(struct pci_bus *bus, unsigned int devfn,
163 int where, int size, u32 val)
167 type = bus->parent ? 1 : 0;
169 if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
170 return PCIBIOS_DEVICE_NOT_FOUND;
172 return bcm63xx_do_cfg_write(type, bus->number, devfn,
176 struct pci_ops bcm63xx_pci_ops = {
177 .read = bcm63xx_pci_read,
178 .write = bcm63xx_pci_write
181 #ifdef CONFIG_CARDBUS
183 * emulate configuration read access on a cardbus bridge
185 #define FAKE_CB_BRIDGE_SLOT 0x1e
187 static int fake_cb_bridge_bus_number = -1;
207 } fake_cb_bridge_regs;
209 static int fake_cb_bridge_read(int where, int size, u32 *val)
217 case (PCI_VENDOR_ID >> 2):
218 case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
219 /* create dummy vendor/device id from our cpu id */
220 data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM;
223 case (PCI_COMMAND >> 2):
224 data = (PCI_STATUS_DEVSEL_SLOW << 16);
225 data |= fake_cb_bridge_regs.pci_command;
228 case (PCI_CLASS_REVISION >> 2):
229 data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
232 case (PCI_CACHE_LINE_SIZE >> 2):
233 data = (PCI_HEADER_TYPE_CARDBUS << 16);
236 case (PCI_INTERRUPT_LINE >> 2):
238 data = (fake_cb_bridge_regs.bridge_control << 16);
239 /* pin:intA line:0xff */
240 data |= (0x1 << 8) | 0xff;
243 case (PCI_CB_PRIMARY_BUS >> 2):
244 data = (fake_cb_bridge_regs.cb_latency << 24);
245 data |= (fake_cb_bridge_regs.subordinate_busn << 16);
246 data |= (fake_cb_bridge_regs.cardbus_busn << 8);
247 data |= fake_cb_bridge_regs.pci_busn;
250 case (PCI_CB_MEMORY_BASE_0 >> 2):
251 data = fake_cb_bridge_regs.mem_base0;
254 case (PCI_CB_MEMORY_LIMIT_0 >> 2):
255 data = fake_cb_bridge_regs.mem_limit0;
258 case (PCI_CB_MEMORY_BASE_1 >> 2):
259 data = fake_cb_bridge_regs.mem_base1;
262 case (PCI_CB_MEMORY_LIMIT_1 >> 2):
263 data = fake_cb_bridge_regs.mem_limit1;
266 case (PCI_CB_IO_BASE_0 >> 2):
267 /* | 1 for 32bits io support */
268 data = fake_cb_bridge_regs.io_base0 | 0x1;
271 case (PCI_CB_IO_LIMIT_0 >> 2):
272 data = fake_cb_bridge_regs.io_limit0;
275 case (PCI_CB_IO_BASE_1 >> 2):
276 /* | 1 for 32bits io support */
277 data = fake_cb_bridge_regs.io_base1 | 0x1;
280 case (PCI_CB_IO_LIMIT_1 >> 2):
281 data = fake_cb_bridge_regs.io_limit1;
285 *val = postprocess_read(data, where, size);
286 return PCIBIOS_SUCCESSFUL;
290 * emulate configuration write access on a cardbus bridge
292 static int fake_cb_bridge_write(int where, int size, u32 val)
298 ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
299 if (ret != PCIBIOS_SUCCESSFUL)
302 data = preprocess_write(data, val, where, size);
306 case (PCI_COMMAND >> 2):
307 fake_cb_bridge_regs.pci_command = (data & 0xffff);
310 case (PCI_CB_PRIMARY_BUS >> 2):
311 fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
312 fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
313 fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
314 fake_cb_bridge_regs.pci_busn = data & 0xff;
315 if (fake_cb_bridge_regs.cardbus_busn)
316 fake_cb_bridge_regs.bus_assigned = 1;
319 case (PCI_INTERRUPT_LINE >> 2):
320 tmp = (data >> 16) & 0xffff;
321 /* disable memory prefetch support */
322 tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
323 tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
324 fake_cb_bridge_regs.bridge_control = tmp;
327 case (PCI_CB_MEMORY_BASE_0 >> 2):
328 fake_cb_bridge_regs.mem_base0 = data;
331 case (PCI_CB_MEMORY_LIMIT_0 >> 2):
332 fake_cb_bridge_regs.mem_limit0 = data;
335 case (PCI_CB_MEMORY_BASE_1 >> 2):
336 fake_cb_bridge_regs.mem_base1 = data;
339 case (PCI_CB_MEMORY_LIMIT_1 >> 2):
340 fake_cb_bridge_regs.mem_limit1 = data;
343 case (PCI_CB_IO_BASE_0 >> 2):
344 fake_cb_bridge_regs.io_base0 = data;
347 case (PCI_CB_IO_LIMIT_0 >> 2):
348 fake_cb_bridge_regs.io_limit0 = data;
351 case (PCI_CB_IO_BASE_1 >> 2):
352 fake_cb_bridge_regs.io_base1 = data;
355 case (PCI_CB_IO_LIMIT_1 >> 2):
356 fake_cb_bridge_regs.io_limit1 = data;
360 return PCIBIOS_SUCCESSFUL;
363 static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
364 int where, int size, u32 *val)
366 /* snoop access to slot 0x1e on root bus, we fake a cardbus
367 * bridge at this location */
368 if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
369 fake_cb_bridge_bus_number = bus->number;
370 return fake_cb_bridge_read(where, size, val);
373 /* a configuration cycle for the device behind the cardbus
374 * bridge is actually done as a type 0 cycle on the primary
375 * bus. This means that only one device can be on the cardbus
377 if (fake_cb_bridge_regs.bus_assigned &&
378 bus->number == fake_cb_bridge_regs.cardbus_busn &&
379 PCI_SLOT(devfn) == 0)
380 return bcm63xx_do_cfg_read(0, 0,
381 PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
384 return PCIBIOS_DEVICE_NOT_FOUND;
387 static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
388 int where, int size, u32 val)
390 if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
391 fake_cb_bridge_bus_number = bus->number;
392 return fake_cb_bridge_write(where, size, val);
395 if (fake_cb_bridge_regs.bus_assigned &&
396 bus->number == fake_cb_bridge_regs.cardbus_busn &&
397 PCI_SLOT(devfn) == 0)
398 return bcm63xx_do_cfg_write(0, 0,
399 PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
402 return PCIBIOS_DEVICE_NOT_FOUND;
405 struct pci_ops bcm63xx_cb_ops = {
406 .read = bcm63xx_cb_read,
407 .write = bcm63xx_cb_write,
411 * only one IO window, so it cannot be shared by PCI and cardbus, use
412 * fixup to choose and detect unhandled configuration
414 static void bcm63xx_fixup(struct pci_dev *dev)
416 static int io_window = -1;
417 int i, found, new_io_window;
420 /* look for any io resource */
422 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
423 if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
432 /* skip our fake bus with only cardbus bridge on it */
433 if (dev->bus->number == fake_cb_bridge_bus_number)
436 /* find on which bus the device is */
437 if (fake_cb_bridge_regs.bus_assigned &&
438 dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
439 PCI_SLOT(dev->devfn) == 0)
444 if (new_io_window == io_window)
447 if (io_window != -1) {
448 printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
449 "need IO, which hardware cannot do\n");
453 printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
454 (new_io_window == 0) ? "PCI" : "cardbus");
456 val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
458 val |= MPI_L2PREMAP_IS_CARDBUS_MASK;
460 val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
461 bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);
463 io_window = new_io_window;
466 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);