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>
17 #include <asm/mach/pci.h>
18 #include <plat/pcie.h>
21 /*****************************************************************************
22 * Orion has one PCIe controller and one PCI controller.
24 * Note1: The local PCIe bus number is '0'. The local PCI bus number
25 * follows the scanned PCIe bridged busses, if any.
27 * Note2: It is possible for PCI/PCIe agents to access many subsystem's
28 * space, by configuring BARs and Address Decode Windows, e.g. flashes on
29 * device bus, Orion registers, etc. However this code only enable the
30 * access to DDR banks.
31 ****************************************************************************/
34 /*****************************************************************************
36 ****************************************************************************/
37 #define PCIE_BASE ((void __iomem *)ORION5X_PCIE_VIRT_BASE)
39 void __init orion5x_pcie_id(u32 *dev, u32 *rev)
41 *dev = orion_pcie_dev_id(PCIE_BASE);
42 *rev = orion_pcie_rev(PCIE_BASE);
45 static int pcie_valid_config(int bus, int dev)
48 * Don't go out when trying to access --
49 * 1. nonexisting device on local bus
50 * 2. where there's no device connected (no link)
52 if (bus == 0 && dev == 0)
55 if (!orion_pcie_link_up(PCIE_BASE))
58 if (bus == 0 && dev != 1)
66 * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
67 * and then reading the PCIE_CONF_DATA register. Need to make sure these
68 * transactions are atomic.
70 static DEFINE_SPINLOCK(orion5x_pcie_lock);
72 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
78 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
80 return PCIBIOS_DEVICE_NOT_FOUND;
83 spin_lock_irqsave(&orion5x_pcie_lock, flags);
84 ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
85 spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
90 static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
91 int where, int size, u32 *val)
95 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
97 return PCIBIOS_DEVICE_NOT_FOUND;
101 * We only support access to the non-extended configuration
102 * space when using the WA access method (or we would have to
103 * sacrifice 256M of CPU virtual address space.)
105 if (where >= 0x100) {
107 return PCIBIOS_DEVICE_NOT_FOUND;
110 ret = orion_pcie_rd_conf_wa((void __iomem *)ORION5X_PCIE_WA_VIRT_BASE,
111 bus, devfn, where, size, val);
116 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
117 int where, int size, u32 val)
122 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
123 return PCIBIOS_DEVICE_NOT_FOUND;
125 spin_lock_irqsave(&orion5x_pcie_lock, flags);
126 ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
127 spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
132 static struct pci_ops pcie_ops = {
133 .read = pcie_rd_conf,
134 .write = pcie_wr_conf,
138 static int __init pcie_setup(struct pci_sys_data *sys)
140 struct resource *res;
144 * Generic PCIe unit setup.
146 orion_pcie_setup(PCIE_BASE, &orion5x_mbus_dram_info);
149 * Check whether to apply Orion-1/Orion-NAS PCIe config
150 * read transaction workaround.
152 dev = orion_pcie_dev_id(PCIE_BASE);
153 if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
154 printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
155 "read transaction workaround\n");
156 orion5x_setup_pcie_wa_win(ORION5X_PCIE_WA_PHYS_BASE,
157 ORION5X_PCIE_WA_SIZE);
158 pcie_ops.read = pcie_rd_conf_wa;
164 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
166 panic("pcie_setup unable to alloc resources");
171 res[0].name = "PCIe I/O Space";
172 res[0].flags = IORESOURCE_IO;
173 res[0].start = ORION5X_PCIE_IO_BUS_BASE;
174 res[0].end = res[0].start + ORION5X_PCIE_IO_SIZE - 1;
175 if (request_resource(&ioport_resource, &res[0]))
176 panic("Request PCIe IO resource failed\n");
177 sys->resource[0] = &res[0];
182 res[1].name = "PCIe Memory Space";
183 res[1].flags = IORESOURCE_MEM;
184 res[1].start = ORION5X_PCIE_MEM_PHYS_BASE;
185 res[1].end = res[1].start + ORION5X_PCIE_MEM_SIZE - 1;
186 if (request_resource(&iomem_resource, &res[1]))
187 panic("Request PCIe Memory resource failed\n");
188 sys->resource[1] = &res[1];
190 sys->resource[2] = NULL;
196 /*****************************************************************************
198 ****************************************************************************/
199 #define ORION5X_PCI_REG(x) (ORION5X_PCI_VIRT_BASE | (x))
200 #define PCI_MODE ORION5X_PCI_REG(0xd00)
201 #define PCI_CMD ORION5X_PCI_REG(0xc00)
202 #define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
203 #define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
204 #define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
209 #define PCI_MODE_64BIT (1 << 2)
210 #define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
215 #define PCI_CMD_HOST_REORDER (1 << 29)
220 #define PCI_P2P_BUS_OFFS 16
221 #define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
222 #define PCI_P2P_DEV_OFFS 24
223 #define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
228 #define PCI_CONF_REG(reg) ((reg) & 0xfc)
229 #define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
230 #define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
231 #define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
232 #define PCI_CONF_ADDR_EN (1 << 31)
235 * Internal configuration space
237 #define PCI_CONF_FUNC_STAT_CMD 0
238 #define PCI_CONF_REG_STAT_CMD 4
239 #define PCIX_STAT 0x64
240 #define PCIX_STAT_BUS_OFFS 8
241 #define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
244 * PCI Address Decode Windows registers
246 #define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
247 ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
248 ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
249 ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
250 #define PCI_BAR_REMAP_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
251 ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
252 ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
253 ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
254 #define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
255 #define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
258 * PCI configuration helpers for BAR settings
260 #define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
261 #define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
262 #define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
265 * PCI config cycles are done by programming the PCI_CONF_ADDR register
266 * and then reading the PCI_CONF_DATA register. Need to make sure these
267 * transactions are atomic.
269 static DEFINE_SPINLOCK(orion5x_pci_lock);
271 static int orion5x_pci_cardbus_mode;
273 static int orion5x_pci_local_bus_nr(void)
275 u32 conf = readl(PCI_P2P_CONF);
276 return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
279 static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
280 u32 where, u32 size, u32 *val)
283 spin_lock_irqsave(&orion5x_pci_lock, flags);
285 writel(PCI_CONF_BUS(bus) |
286 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
287 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
289 *val = readl(PCI_CONF_DATA);
292 *val = (*val >> (8*(where & 0x3))) & 0xff;
294 *val = (*val >> (8*(where & 0x3))) & 0xffff;
296 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
298 return PCIBIOS_SUCCESSFUL;
301 static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
302 u32 where, u32 size, u32 val)
305 int ret = PCIBIOS_SUCCESSFUL;
307 spin_lock_irqsave(&orion5x_pci_lock, flags);
309 writel(PCI_CONF_BUS(bus) |
310 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
311 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
314 __raw_writel(val, PCI_CONF_DATA);
315 } else if (size == 2) {
316 __raw_writew(val, PCI_CONF_DATA + (where & 0x3));
317 } else if (size == 1) {
318 __raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
320 ret = PCIBIOS_BAD_REGISTER_NUMBER;
323 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
328 static int orion5x_pci_valid_config(int bus, u32 devfn)
330 if (bus == orion5x_pci_local_bus_nr()) {
332 * Don't go out for local device
334 if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
338 * When the PCI signals are directly connected to a
339 * Cardbus slot, ignore all but device IDs 0 and 1.
341 if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1)
348 static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
349 int where, int size, u32 *val)
351 if (!orion5x_pci_valid_config(bus->number, devfn)) {
353 return PCIBIOS_DEVICE_NOT_FOUND;
356 return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
357 PCI_FUNC(devfn), where, size, val);
360 static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
361 int where, int size, u32 val)
363 if (!orion5x_pci_valid_config(bus->number, devfn))
364 return PCIBIOS_DEVICE_NOT_FOUND;
366 return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
367 PCI_FUNC(devfn), where, size, val);
370 static struct pci_ops pci_ops = {
371 .read = orion5x_pci_rd_conf,
372 .write = orion5x_pci_wr_conf,
375 static void __init orion5x_pci_set_bus_nr(int nr)
377 u32 p2p = readl(PCI_P2P_CONF);
379 if (readl(PCI_MODE) & PCI_MODE_PCIX) {
383 u32 pcix_status, bus, dev;
384 bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
385 dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
386 orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
387 pcix_status &= ~PCIX_STAT_BUS_MASK;
388 pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
389 orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
392 * PCI Conventional mode
394 p2p &= ~PCI_P2P_BUS_MASK;
395 p2p |= (nr << PCI_P2P_BUS_OFFS);
396 writel(p2p, PCI_P2P_CONF);
400 static void __init orion5x_pci_master_slave_enable(void)
402 int bus_nr, func, reg;
405 bus_nr = orion5x_pci_local_bus_nr();
406 func = PCI_CONF_FUNC_STAT_CMD;
407 reg = PCI_CONF_REG_STAT_CMD;
408 orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
409 val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
410 orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
413 static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram)
420 * First, disable windows.
422 win_enable = 0xffffffff;
423 writel(win_enable, PCI_BAR_ENABLE);
426 * Setup windows for DDR banks.
428 bus = orion5x_pci_local_bus_nr();
430 for (i = 0; i < dram->num_cs; i++) {
431 struct mbus_dram_window *cs = dram->cs + i;
432 u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
437 * Write DRAM bank base address register.
439 reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
440 orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
441 val = (cs->base & 0xfffff000) | (val & 0xfff);
442 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
445 * Write DRAM bank size register.
447 reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
448 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
449 writel((cs->size - 1) & 0xfffff000,
450 PCI_BAR_SIZE_DDR_CS(cs->cs_index));
451 writel(cs->base & 0xfffff000,
452 PCI_BAR_REMAP_DDR_CS(cs->cs_index));
455 * Enable decode window for this chip select.
457 win_enable &= ~(1 << cs->cs_index);
461 * Re-enable decode windows.
463 writel(win_enable, PCI_BAR_ENABLE);
466 * Disable automatic update of address remaping when writing to BARs.
468 orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
471 static int __init pci_setup(struct pci_sys_data *sys)
473 struct resource *res;
476 * Point PCI unit MBUS decode windows to DRAM space.
478 orion5x_setup_pci_wins(&orion5x_mbus_dram_info);
481 * Master + Slave enable
483 orion5x_pci_master_slave_enable();
488 orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
493 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
495 panic("pci_setup unable to alloc resources");
500 res[0].name = "PCI I/O Space";
501 res[0].flags = IORESOURCE_IO;
502 res[0].start = ORION5X_PCI_IO_BUS_BASE;
503 res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1;
504 if (request_resource(&ioport_resource, &res[0]))
505 panic("Request PCI IO resource failed\n");
506 sys->resource[0] = &res[0];
511 res[1].name = "PCI Memory Space";
512 res[1].flags = IORESOURCE_MEM;
513 res[1].start = ORION5X_PCI_MEM_PHYS_BASE;
514 res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1;
515 if (request_resource(&iomem_resource, &res[1]))
516 panic("Request PCI Memory resource failed\n");
517 sys->resource[1] = &res[1];
519 sys->resource[2] = NULL;
526 /*****************************************************************************
528 ****************************************************************************/
529 static void __devinit rc_pci_fixup(struct pci_dev *dev)
532 * Prevent enumeration of root complex.
534 if (dev->bus->parent == NULL && dev->devfn == 0) {
537 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
538 dev->resource[i].start = 0;
539 dev->resource[i].end = 0;
540 dev->resource[i].flags = 0;
544 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
546 static int orion5x_pci_disabled __initdata;
548 void __init orion5x_pci_disable(void)
550 orion5x_pci_disabled = 1;
553 void __init orion5x_pci_set_cardbus_mode(void)
555 orion5x_pci_cardbus_mode = 1;
558 int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
563 orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
564 ret = pcie_setup(sys);
565 } else if (nr == 1 && !orion5x_pci_disabled) {
566 orion5x_pci_set_bus_nr(sys->busnr);
567 ret = pci_setup(sys);
573 struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
578 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
579 } else if (nr == 1 && !orion5x_pci_disabled) {
580 bus = pci_scan_bus(sys->busnr, &pci_ops, sys);
589 int __init orion5x_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
591 int bus = dev->bus->number;
596 if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr())
597 return IRQ_ORION5X_PCIE0_INT;