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 PCI_MODE ORION5X_PCI_REG(0xd00)
200 #define PCI_CMD ORION5X_PCI_REG(0xc00)
201 #define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
202 #define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
203 #define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
208 #define PCI_MODE_64BIT (1 << 2)
209 #define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
214 #define PCI_CMD_HOST_REORDER (1 << 29)
219 #define PCI_P2P_BUS_OFFS 16
220 #define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
221 #define PCI_P2P_DEV_OFFS 24
222 #define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
227 #define PCI_CONF_REG(reg) ((reg) & 0xfc)
228 #define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
229 #define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
230 #define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
231 #define PCI_CONF_ADDR_EN (1 << 31)
234 * Internal configuration space
236 #define PCI_CONF_FUNC_STAT_CMD 0
237 #define PCI_CONF_REG_STAT_CMD 4
238 #define PCIX_STAT 0x64
239 #define PCIX_STAT_BUS_OFFS 8
240 #define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
243 * PCI Address Decode Windows registers
245 #define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
246 ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
247 ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
248 ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
249 #define PCI_BAR_REMAP_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
250 ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
251 ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
252 ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
253 #define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
254 #define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
257 * PCI configuration helpers for BAR settings
259 #define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
260 #define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
261 #define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
264 * PCI config cycles are done by programming the PCI_CONF_ADDR register
265 * and then reading the PCI_CONF_DATA register. Need to make sure these
266 * transactions are atomic.
268 static DEFINE_SPINLOCK(orion5x_pci_lock);
270 static int orion5x_pci_cardbus_mode;
272 static int orion5x_pci_local_bus_nr(void)
274 u32 conf = readl(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 writel(PCI_CONF_BUS(bus) |
285 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
286 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
288 *val = readl(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 writel(PCI_CONF_BUS(bus) |
309 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
310 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
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_valid_config(int bus, u32 devfn)
329 if (bus == orion5x_pci_local_bus_nr()) {
331 * Don't go out for local device
333 if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
337 * When the PCI signals are directly connected to a
338 * Cardbus slot, ignore all but device IDs 0 and 1.
340 if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1)
347 static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
348 int where, int size, u32 *val)
350 if (!orion5x_pci_valid_config(bus->number, devfn)) {
352 return PCIBIOS_DEVICE_NOT_FOUND;
355 return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
356 PCI_FUNC(devfn), where, size, val);
359 static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
360 int where, int size, u32 val)
362 if (!orion5x_pci_valid_config(bus->number, devfn))
363 return PCIBIOS_DEVICE_NOT_FOUND;
365 return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
366 PCI_FUNC(devfn), where, size, val);
369 static struct pci_ops pci_ops = {
370 .read = orion5x_pci_rd_conf,
371 .write = orion5x_pci_wr_conf,
374 static void __init orion5x_pci_set_bus_nr(int nr)
376 u32 p2p = readl(PCI_P2P_CONF);
378 if (readl(PCI_MODE) & PCI_MODE_PCIX) {
382 u32 pcix_status, bus, dev;
383 bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
384 dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
385 orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
386 pcix_status &= ~PCIX_STAT_BUS_MASK;
387 pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
388 orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
391 * PCI Conventional mode
393 p2p &= ~PCI_P2P_BUS_MASK;
394 p2p |= (nr << PCI_P2P_BUS_OFFS);
395 writel(p2p, PCI_P2P_CONF);
399 static void __init orion5x_pci_master_slave_enable(void)
401 int bus_nr, func, reg;
404 bus_nr = orion5x_pci_local_bus_nr();
405 func = PCI_CONF_FUNC_STAT_CMD;
406 reg = PCI_CONF_REG_STAT_CMD;
407 orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
408 val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
409 orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
412 static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram)
419 * First, disable windows.
421 win_enable = 0xffffffff;
422 writel(win_enable, PCI_BAR_ENABLE);
425 * Setup windows for DDR banks.
427 bus = orion5x_pci_local_bus_nr();
429 for (i = 0; i < dram->num_cs; i++) {
430 struct mbus_dram_window *cs = dram->cs + i;
431 u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
436 * Write DRAM bank base address register.
438 reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
439 orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
440 val = (cs->base & 0xfffff000) | (val & 0xfff);
441 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
444 * Write DRAM bank size register.
446 reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
447 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
448 writel((cs->size - 1) & 0xfffff000,
449 PCI_BAR_SIZE_DDR_CS(cs->cs_index));
450 writel(cs->base & 0xfffff000,
451 PCI_BAR_REMAP_DDR_CS(cs->cs_index));
454 * Enable decode window for this chip select.
456 win_enable &= ~(1 << cs->cs_index);
460 * Re-enable decode windows.
462 writel(win_enable, PCI_BAR_ENABLE);
465 * Disable automatic update of address remaping when writing to BARs.
467 orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
470 static int __init pci_setup(struct pci_sys_data *sys)
472 struct resource *res;
475 * Point PCI unit MBUS decode windows to DRAM space.
477 orion5x_setup_pci_wins(&orion5x_mbus_dram_info);
480 * Master + Slave enable
482 orion5x_pci_master_slave_enable();
487 orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
492 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
494 panic("pci_setup unable to alloc resources");
499 res[0].name = "PCI I/O Space";
500 res[0].flags = IORESOURCE_IO;
501 res[0].start = ORION5X_PCI_IO_BUS_BASE;
502 res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1;
503 if (request_resource(&ioport_resource, &res[0]))
504 panic("Request PCI IO resource failed\n");
505 sys->resource[0] = &res[0];
510 res[1].name = "PCI Memory Space";
511 res[1].flags = IORESOURCE_MEM;
512 res[1].start = ORION5X_PCI_MEM_PHYS_BASE;
513 res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1;
514 if (request_resource(&iomem_resource, &res[1]))
515 panic("Request PCI Memory resource failed\n");
516 sys->resource[1] = &res[1];
518 sys->resource[2] = NULL;
525 /*****************************************************************************
527 ****************************************************************************/
528 static void __devinit rc_pci_fixup(struct pci_dev *dev)
531 * Prevent enumeration of root complex.
533 if (dev->bus->parent == NULL && dev->devfn == 0) {
536 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
537 dev->resource[i].start = 0;
538 dev->resource[i].end = 0;
539 dev->resource[i].flags = 0;
543 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
545 static int orion5x_pci_disabled __initdata;
547 void __init orion5x_pci_disable(void)
549 orion5x_pci_disabled = 1;
552 void __init orion5x_pci_set_cardbus_mode(void)
554 orion5x_pci_cardbus_mode = 1;
557 int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
562 orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
563 ret = pcie_setup(sys);
564 } else if (nr == 1 && !orion5x_pci_disabled) {
565 orion5x_pci_set_bus_nr(sys->busnr);
566 ret = pci_setup(sys);
572 struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
577 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
578 } else if (nr == 1 && !orion5x_pci_disabled) {
579 bus = pci_scan_bus(sys->busnr, &pci_ops, sys);
588 int __init orion5x_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
590 int bus = dev->bus->number;
595 if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr())
596 return IRQ_ORION5X_PCIE0_INT;