2 * arch/arm/mach-orion5x/pci.c
4 * PCI and PCIe functions for Marvell Orion System On Chip
6 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/mbus.h>
16 #include <asm/mach/pci.h>
17 #include <asm/plat-orion/pcie.h>
20 /*****************************************************************************
21 * Orion has one PCIe controller and one PCI controller.
23 * Note1: The local PCIe bus number is '0'. The local PCI bus number
24 * follows the scanned PCIe bridged busses, if any.
26 * Note2: It is possible for PCI/PCIe agents to access many subsystem's
27 * space, by configuring BARs and Address Decode Windows, e.g. flashes on
28 * device bus, Orion registers, etc. However this code only enable the
29 * access to DDR banks.
30 ****************************************************************************/
33 /*****************************************************************************
35 ****************************************************************************/
36 #define PCIE_BASE ((void __iomem *)ORION5X_PCIE_VIRT_BASE)
38 void __init orion5x_pcie_id(u32 *dev, u32 *rev)
40 *dev = orion_pcie_dev_id(PCIE_BASE);
41 *rev = orion_pcie_rev(PCIE_BASE);
44 int __init orion5x_pcie_local_bus_nr(void)
46 return orion_pcie_get_local_bus_nr(PCIE_BASE);
49 static int pcie_valid_config(int bus, int dev)
52 * Don't go out when trying to access --
53 * 1. nonexisting device on local bus
54 * 2. where there's no device connected (no link)
56 if (bus == 0 && dev == 0)
59 if (!orion_pcie_link_up(PCIE_BASE))
62 if (bus == 0 && dev != 1)
70 * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
71 * and then reading the PCIE_CONF_DATA register. Need to make sure these
72 * transactions are atomic.
74 static DEFINE_SPINLOCK(orion5x_pcie_lock);
76 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
82 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
84 return PCIBIOS_DEVICE_NOT_FOUND;
87 spin_lock_irqsave(&orion5x_pcie_lock, flags);
88 ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
89 spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
94 static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
95 int where, int size, u32 *val)
99 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
101 return PCIBIOS_DEVICE_NOT_FOUND;
105 * We only support access to the non-extended configuration
106 * space when using the WA access method (or we would have to
107 * sacrifice 256M of CPU virtual address space.)
109 if (where >= 0x100) {
111 return PCIBIOS_DEVICE_NOT_FOUND;
114 ret = orion_pcie_rd_conf_wa((void __iomem *)ORION5X_PCIE_WA_VIRT_BASE,
115 bus, devfn, where, size, val);
120 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
121 int where, int size, u32 val)
126 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
127 return PCIBIOS_DEVICE_NOT_FOUND;
129 spin_lock_irqsave(&orion5x_pcie_lock, flags);
130 ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
131 spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
136 static struct pci_ops pcie_ops = {
137 .read = pcie_rd_conf,
138 .write = pcie_wr_conf,
142 static int __init pcie_setup(struct pci_sys_data *sys)
144 struct resource *res;
148 * Generic PCIe unit setup.
150 orion_pcie_setup(PCIE_BASE, &orion5x_mbus_dram_info);
153 * Check whether to apply Orion-1/Orion-NAS PCIe config
154 * read transaction workaround.
156 dev = orion_pcie_dev_id(PCIE_BASE);
157 if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
158 printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
159 "read transaction workaround\n");
160 pcie_ops.read = pcie_rd_conf_wa;
166 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
168 panic("pcie_setup unable to alloc resources");
173 res[0].name = "PCIe I/O Space";
174 res[0].flags = IORESOURCE_IO;
175 res[0].start = ORION5X_PCIE_IO_BUS_BASE;
176 res[0].end = res[0].start + ORION5X_PCIE_IO_SIZE - 1;
177 if (request_resource(&ioport_resource, &res[0]))
178 panic("Request PCIe IO resource failed\n");
179 sys->resource[0] = &res[0];
184 res[1].name = "PCIe Memory Space";
185 res[1].flags = IORESOURCE_MEM;
186 res[1].start = ORION5X_PCIE_MEM_PHYS_BASE;
187 res[1].end = res[1].start + ORION5X_PCIE_MEM_SIZE - 1;
188 if (request_resource(&iomem_resource, &res[1]))
189 panic("Request PCIe Memory resource failed\n");
190 sys->resource[1] = &res[1];
192 sys->resource[2] = NULL;
198 /*****************************************************************************
200 ****************************************************************************/
201 #define PCI_MODE ORION5X_PCI_REG(0xd00)
202 #define PCI_CMD ORION5X_PCI_REG(0xc00)
203 #define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
204 #define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
205 #define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
210 #define PCI_MODE_64BIT (1 << 2)
211 #define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
216 #define PCI_CMD_HOST_REORDER (1 << 29)
221 #define PCI_P2P_BUS_OFFS 16
222 #define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
223 #define PCI_P2P_DEV_OFFS 24
224 #define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
229 #define PCI_CONF_REG(reg) ((reg) & 0xfc)
230 #define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
231 #define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
232 #define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
233 #define PCI_CONF_ADDR_EN (1 << 31)
236 * Internal configuration space
238 #define PCI_CONF_FUNC_STAT_CMD 0
239 #define PCI_CONF_REG_STAT_CMD 4
240 #define PCIX_STAT 0x64
241 #define PCIX_STAT_BUS_OFFS 8
242 #define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
245 * PCI Address Decode Windows registers
247 #define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
248 ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
249 ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
250 ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
251 #define PCI_BAR_REMAP_DDR_CS(n) (((n) ==0) ? ORION5X_PCI_REG(0xc48) : \
252 ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
253 ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
254 ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
255 #define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
256 #define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
259 * PCI configuration helpers for BAR settings
261 #define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
262 #define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
263 #define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
266 * PCI config cycles are done by programming the PCI_CONF_ADDR register
267 * and then reading the PCI_CONF_DATA register. Need to make sure these
268 * transactions are atomic.
270 static DEFINE_SPINLOCK(orion5x_pci_lock);
272 int orion5x_pci_local_bus_nr(void)
274 u32 conf = orion5x_read(PCI_P2P_CONF);
275 return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
278 static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
279 u32 where, u32 size, u32 *val)
282 spin_lock_irqsave(&orion5x_pci_lock, flags);
284 orion5x_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
285 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
286 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
288 *val = orion5x_read(PCI_CONF_DATA);
291 *val = (*val >> (8*(where & 0x3))) & 0xff;
293 *val = (*val >> (8*(where & 0x3))) & 0xffff;
295 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
297 return PCIBIOS_SUCCESSFUL;
300 static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
301 u32 where, u32 size, u32 val)
304 int ret = PCIBIOS_SUCCESSFUL;
306 spin_lock_irqsave(&orion5x_pci_lock, flags);
308 orion5x_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
309 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
310 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
313 __raw_writel(val, PCI_CONF_DATA);
314 } else if (size == 2) {
315 __raw_writew(val, PCI_CONF_DATA + (where & 0x3));
316 } else if (size == 1) {
317 __raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
319 ret = PCIBIOS_BAD_REGISTER_NUMBER;
322 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
327 static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
328 int where, int size, u32 *val)
331 * Don't go out for local device
333 if (bus->number == orion5x_pci_local_bus_nr() &&
334 PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0) {
336 return PCIBIOS_DEVICE_NOT_FOUND;
339 return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
340 PCI_FUNC(devfn), where, size, val);
343 static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
344 int where, int size, u32 val)
346 if (bus->number == orion5x_pci_local_bus_nr() &&
347 PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
348 return PCIBIOS_DEVICE_NOT_FOUND;
350 return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
351 PCI_FUNC(devfn), where, size, val);
354 static struct pci_ops pci_ops = {
355 .read = orion5x_pci_rd_conf,
356 .write = orion5x_pci_wr_conf,
359 static void __init orion5x_pci_set_bus_nr(int nr)
361 u32 p2p = orion5x_read(PCI_P2P_CONF);
363 if (orion5x_read(PCI_MODE) & PCI_MODE_PCIX) {
367 u32 pcix_status, bus, dev;
368 bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
369 dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
370 orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
371 pcix_status &= ~PCIX_STAT_BUS_MASK;
372 pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
373 orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
376 * PCI Conventional mode
378 p2p &= ~PCI_P2P_BUS_MASK;
379 p2p |= (nr << PCI_P2P_BUS_OFFS);
380 orion5x_write(PCI_P2P_CONF, p2p);
384 static void __init orion5x_pci_master_slave_enable(void)
386 int bus_nr, func, reg;
389 bus_nr = orion5x_pci_local_bus_nr();
390 func = PCI_CONF_FUNC_STAT_CMD;
391 reg = PCI_CONF_REG_STAT_CMD;
392 orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
393 val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
394 orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
397 static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram)
404 * First, disable windows.
406 win_enable = 0xffffffff;
407 orion5x_write(PCI_BAR_ENABLE, win_enable);
410 * Setup windows for DDR banks.
412 bus = orion5x_pci_local_bus_nr();
414 for (i = 0; i < dram->num_cs; i++) {
415 struct mbus_dram_window *cs = dram->cs + i;
416 u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
421 * Write DRAM bank base address register.
423 reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
424 orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
425 val = (cs->base & 0xfffff000) | (val & 0xfff);
426 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
429 * Write DRAM bank size register.
431 reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
432 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
433 orion5x_write(PCI_BAR_SIZE_DDR_CS(cs->cs_index),
434 (cs->size - 1) & 0xfffff000);
435 orion5x_write(PCI_BAR_REMAP_DDR_CS(cs->cs_index),
436 cs->base & 0xfffff000);
439 * Enable decode window for this chip select.
441 win_enable &= ~(1 << cs->cs_index);
445 * Re-enable decode windows.
447 orion5x_write(PCI_BAR_ENABLE, win_enable);
450 * Disable automatic update of address remaping when writing to BARs.
452 orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
455 static int __init pci_setup(struct pci_sys_data *sys)
457 struct resource *res;
460 * Point PCI unit MBUS decode windows to DRAM space.
462 orion5x_setup_pci_wins(&orion5x_mbus_dram_info);
465 * Master + Slave enable
467 orion5x_pci_master_slave_enable();
472 orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
477 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
479 panic("pci_setup unable to alloc resources");
484 res[0].name = "PCI I/O Space";
485 res[0].flags = IORESOURCE_IO;
486 res[0].start = ORION5X_PCI_IO_BUS_BASE;
487 res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1;
488 if (request_resource(&ioport_resource, &res[0]))
489 panic("Request PCI IO resource failed\n");
490 sys->resource[0] = &res[0];
495 res[1].name = "PCI Memory Space";
496 res[1].flags = IORESOURCE_MEM;
497 res[1].start = ORION5X_PCI_MEM_PHYS_BASE;
498 res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1;
499 if (request_resource(&iomem_resource, &res[1]))
500 panic("Request PCI Memory resource failed\n");
501 sys->resource[1] = &res[1];
503 sys->resource[2] = NULL;
510 /*****************************************************************************
512 ****************************************************************************/
513 static void __devinit rc_pci_fixup(struct pci_dev *dev)
516 * Prevent enumeration of root complex.
518 if (dev->bus->parent == NULL && dev->devfn == 0) {
521 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
522 dev->resource[i].start = 0;
523 dev->resource[i].end = 0;
524 dev->resource[i].flags = 0;
528 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
530 int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
535 orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
536 ret = pcie_setup(sys);
537 } else if (nr == 1) {
538 orion5x_pci_set_bus_nr(sys->busnr);
539 ret = pci_setup(sys);
545 struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
550 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
551 } else if (nr == 1) {
552 bus = pci_scan_bus(sys->busnr, &pci_ops, sys);