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 static int pcie_valid_config(int bus, int dev)
47 * Don't go out when trying to access --
48 * 1. nonexisting device on local bus
49 * 2. where there's no device connected (no link)
51 if (bus == 0 && dev == 0)
54 if (!orion_pcie_link_up(PCIE_BASE))
57 if (bus == 0 && dev != 1)
65 * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
66 * and then reading the PCIE_CONF_DATA register. Need to make sure these
67 * transactions are atomic.
69 static DEFINE_SPINLOCK(orion5x_pcie_lock);
71 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
77 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
79 return PCIBIOS_DEVICE_NOT_FOUND;
82 spin_lock_irqsave(&orion5x_pcie_lock, flags);
83 ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
84 spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
89 static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
90 int where, int size, u32 *val)
94 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
96 return PCIBIOS_DEVICE_NOT_FOUND;
100 * We only support access to the non-extended configuration
101 * space when using the WA access method (or we would have to
102 * sacrifice 256M of CPU virtual address space.)
104 if (where >= 0x100) {
106 return PCIBIOS_DEVICE_NOT_FOUND;
109 ret = orion_pcie_rd_conf_wa((void __iomem *)ORION5X_PCIE_WA_VIRT_BASE,
110 bus, devfn, where, size, val);
115 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
116 int where, int size, u32 val)
121 if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
122 return PCIBIOS_DEVICE_NOT_FOUND;
124 spin_lock_irqsave(&orion5x_pcie_lock, flags);
125 ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
126 spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
131 static struct pci_ops pcie_ops = {
132 .read = pcie_rd_conf,
133 .write = pcie_wr_conf,
137 static int __init pcie_setup(struct pci_sys_data *sys)
139 struct resource *res;
143 * Generic PCIe unit setup.
145 orion_pcie_setup(PCIE_BASE, &orion5x_mbus_dram_info);
148 * Check whether to apply Orion-1/Orion-NAS PCIe config
149 * read transaction workaround.
151 dev = orion_pcie_dev_id(PCIE_BASE);
152 if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
153 printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
154 "read transaction workaround\n");
155 pcie_ops.read = pcie_rd_conf_wa;
161 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
163 panic("pcie_setup unable to alloc resources");
168 res[0].name = "PCIe I/O Space";
169 res[0].flags = IORESOURCE_IO;
170 res[0].start = ORION5X_PCIE_IO_BUS_BASE;
171 res[0].end = res[0].start + ORION5X_PCIE_IO_SIZE - 1;
172 if (request_resource(&ioport_resource, &res[0]))
173 panic("Request PCIe IO resource failed\n");
174 sys->resource[0] = &res[0];
179 res[1].name = "PCIe Memory Space";
180 res[1].flags = IORESOURCE_MEM;
181 res[1].start = ORION5X_PCIE_MEM_PHYS_BASE;
182 res[1].end = res[1].start + ORION5X_PCIE_MEM_SIZE - 1;
183 if (request_resource(&iomem_resource, &res[1]))
184 panic("Request PCIe Memory resource failed\n");
185 sys->resource[1] = &res[1];
187 sys->resource[2] = NULL;
193 /*****************************************************************************
195 ****************************************************************************/
196 #define PCI_MODE ORION5X_PCI_REG(0xd00)
197 #define PCI_CMD ORION5X_PCI_REG(0xc00)
198 #define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
199 #define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
200 #define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
205 #define PCI_MODE_64BIT (1 << 2)
206 #define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
211 #define PCI_CMD_HOST_REORDER (1 << 29)
216 #define PCI_P2P_BUS_OFFS 16
217 #define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
218 #define PCI_P2P_DEV_OFFS 24
219 #define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
224 #define PCI_CONF_REG(reg) ((reg) & 0xfc)
225 #define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
226 #define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
227 #define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
228 #define PCI_CONF_ADDR_EN (1 << 31)
231 * Internal configuration space
233 #define PCI_CONF_FUNC_STAT_CMD 0
234 #define PCI_CONF_REG_STAT_CMD 4
235 #define PCIX_STAT 0x64
236 #define PCIX_STAT_BUS_OFFS 8
237 #define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
240 * PCI Address Decode Windows registers
242 #define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
243 ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
244 ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
245 ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
246 #define PCI_BAR_REMAP_DDR_CS(n) (((n) ==0) ? ORION5X_PCI_REG(0xc48) : \
247 ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
248 ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
249 ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
250 #define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
251 #define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
254 * PCI configuration helpers for BAR settings
256 #define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
257 #define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
258 #define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
261 * PCI config cycles are done by programming the PCI_CONF_ADDR register
262 * and then reading the PCI_CONF_DATA register. Need to make sure these
263 * transactions are atomic.
265 static DEFINE_SPINLOCK(orion5x_pci_lock);
267 static int orion5x_pci_local_bus_nr(void)
269 u32 conf = orion5x_read(PCI_P2P_CONF);
270 return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
273 static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
274 u32 where, u32 size, u32 *val)
277 spin_lock_irqsave(&orion5x_pci_lock, flags);
279 orion5x_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
280 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
281 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
283 *val = orion5x_read(PCI_CONF_DATA);
286 *val = (*val >> (8*(where & 0x3))) & 0xff;
288 *val = (*val >> (8*(where & 0x3))) & 0xffff;
290 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
292 return PCIBIOS_SUCCESSFUL;
295 static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
296 u32 where, u32 size, u32 val)
299 int ret = PCIBIOS_SUCCESSFUL;
301 spin_lock_irqsave(&orion5x_pci_lock, flags);
303 orion5x_write(PCI_CONF_ADDR, PCI_CONF_BUS(bus) |
304 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
305 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN);
308 __raw_writel(val, PCI_CONF_DATA);
309 } else if (size == 2) {
310 __raw_writew(val, PCI_CONF_DATA + (where & 0x3));
311 } else if (size == 1) {
312 __raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
314 ret = PCIBIOS_BAD_REGISTER_NUMBER;
317 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
322 static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
323 int where, int size, u32 *val)
326 * Don't go out for local device
328 if (bus->number == orion5x_pci_local_bus_nr() &&
329 PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0) {
331 return PCIBIOS_DEVICE_NOT_FOUND;
334 return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
335 PCI_FUNC(devfn), where, size, val);
338 static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
339 int where, int size, u32 val)
341 if (bus->number == orion5x_pci_local_bus_nr() &&
342 PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
343 return PCIBIOS_DEVICE_NOT_FOUND;
345 return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
346 PCI_FUNC(devfn), where, size, val);
349 static struct pci_ops pci_ops = {
350 .read = orion5x_pci_rd_conf,
351 .write = orion5x_pci_wr_conf,
354 static void __init orion5x_pci_set_bus_nr(int nr)
356 u32 p2p = orion5x_read(PCI_P2P_CONF);
358 if (orion5x_read(PCI_MODE) & PCI_MODE_PCIX) {
362 u32 pcix_status, bus, dev;
363 bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
364 dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
365 orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
366 pcix_status &= ~PCIX_STAT_BUS_MASK;
367 pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
368 orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
371 * PCI Conventional mode
373 p2p &= ~PCI_P2P_BUS_MASK;
374 p2p |= (nr << PCI_P2P_BUS_OFFS);
375 orion5x_write(PCI_P2P_CONF, p2p);
379 static void __init orion5x_pci_master_slave_enable(void)
381 int bus_nr, func, reg;
384 bus_nr = orion5x_pci_local_bus_nr();
385 func = PCI_CONF_FUNC_STAT_CMD;
386 reg = PCI_CONF_REG_STAT_CMD;
387 orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
388 val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
389 orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
392 static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram)
399 * First, disable windows.
401 win_enable = 0xffffffff;
402 orion5x_write(PCI_BAR_ENABLE, win_enable);
405 * Setup windows for DDR banks.
407 bus = orion5x_pci_local_bus_nr();
409 for (i = 0; i < dram->num_cs; i++) {
410 struct mbus_dram_window *cs = dram->cs + i;
411 u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
416 * Write DRAM bank base address register.
418 reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
419 orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
420 val = (cs->base & 0xfffff000) | (val & 0xfff);
421 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
424 * Write DRAM bank size register.
426 reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
427 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
428 orion5x_write(PCI_BAR_SIZE_DDR_CS(cs->cs_index),
429 (cs->size - 1) & 0xfffff000);
430 orion5x_write(PCI_BAR_REMAP_DDR_CS(cs->cs_index),
431 cs->base & 0xfffff000);
434 * Enable decode window for this chip select.
436 win_enable &= ~(1 << cs->cs_index);
440 * Re-enable decode windows.
442 orion5x_write(PCI_BAR_ENABLE, win_enable);
445 * Disable automatic update of address remaping when writing to BARs.
447 orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
450 static int __init pci_setup(struct pci_sys_data *sys)
452 struct resource *res;
455 * Point PCI unit MBUS decode windows to DRAM space.
457 orion5x_setup_pci_wins(&orion5x_mbus_dram_info);
460 * Master + Slave enable
462 orion5x_pci_master_slave_enable();
467 orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
472 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
474 panic("pci_setup unable to alloc resources");
479 res[0].name = "PCI I/O Space";
480 res[0].flags = IORESOURCE_IO;
481 res[0].start = ORION5X_PCI_IO_BUS_BASE;
482 res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1;
483 if (request_resource(&ioport_resource, &res[0]))
484 panic("Request PCI IO resource failed\n");
485 sys->resource[0] = &res[0];
490 res[1].name = "PCI Memory Space";
491 res[1].flags = IORESOURCE_MEM;
492 res[1].start = ORION5X_PCI_MEM_PHYS_BASE;
493 res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1;
494 if (request_resource(&iomem_resource, &res[1]))
495 panic("Request PCI Memory resource failed\n");
496 sys->resource[1] = &res[1];
498 sys->resource[2] = NULL;
505 /*****************************************************************************
507 ****************************************************************************/
508 static void __devinit rc_pci_fixup(struct pci_dev *dev)
511 * Prevent enumeration of root complex.
513 if (dev->bus->parent == NULL && dev->devfn == 0) {
516 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
517 dev->resource[i].start = 0;
518 dev->resource[i].end = 0;
519 dev->resource[i].flags = 0;
523 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
525 int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
530 orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
531 ret = pcie_setup(sys);
532 } else if (nr == 1) {
533 orion5x_pci_set_bus_nr(sys->busnr);
534 ret = pci_setup(sys);
540 struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
545 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
546 } else if (nr == 1) {
547 bus = pci_scan_bus(sys->busnr, &pci_ops, sys);
556 int __init orion5x_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
558 int bus = dev->bus->number;
563 if (bus < orion5x_pci_local_bus_nr())
564 return IRQ_ORION5X_PCIE0_INT;