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/slab.h>
16 #include <linux/mbus.h>
17 #include <video/vga.h>
19 #include <asm/mach/pci.h>
20 #include <plat/pcie.h>
21 #include <plat/addr-map.h>
25 /*****************************************************************************
26 * Orion has one PCIe controller and one PCI controller.
28 * Note1: The local PCIe bus number is '0'. The local PCI bus number
29 * follows the scanned PCIe bridged busses, if any.
31 * Note2: It is possible for PCI/PCIe agents to access many subsystem's
32 * space, by configuring BARs and Address Decode Windows, e.g. flashes on
33 * device bus, Orion registers, etc. However this code only enable the
34 * access to DDR banks.
35 ****************************************************************************/
38 /*****************************************************************************
40 ****************************************************************************/
41 #define PCIE_BASE (ORION5X_PCIE_VIRT_BASE)
43 void __init orion5x_pcie_id(u32 *dev, u32 *rev)
45 *dev = orion_pcie_dev_id(PCIE_BASE);
46 *rev = orion_pcie_rev(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(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;
145 struct resource realio;
149 * Generic PCIe unit setup.
151 orion_pcie_setup(PCIE_BASE);
154 * Check whether to apply Orion-1/Orion-NAS PCIe config
155 * read transaction workaround.
157 dev = orion_pcie_dev_id(PCIE_BASE);
158 if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
159 printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
160 "read transaction workaround\n");
161 mvebu_mbus_add_window_by_id(ORION_MBUS_PCIE_WA_TARGET,
162 ORION_MBUS_PCIE_WA_ATTR,
163 ORION5X_PCIE_WA_PHYS_BASE,
164 ORION5X_PCIE_WA_SIZE);
165 pcie_ops.read = pcie_rd_conf_wa;
168 realio.start = sys->busnr * SZ_64K;
169 realio.end = realio.start + SZ_64K - 1;
170 pci_remap_iospace(&realio, ORION5X_PCIE_IO_PHYS_BASE);
175 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
177 panic("pcie_setup unable to alloc resources");
182 res->name = "PCIe Memory Space";
183 res->flags = IORESOURCE_MEM;
184 res->start = ORION5X_PCIE_MEM_PHYS_BASE;
185 res->end = res->start + ORION5X_PCIE_MEM_SIZE - 1;
186 if (request_resource(&iomem_resource, res))
187 panic("Request PCIe Memory resource failed\n");
188 pci_add_resource_offset(&sys->resources, res, sys->mem_offset);
193 /*****************************************************************************
195 ****************************************************************************/
196 #define ORION5X_PCI_REG(x) (ORION5X_PCI_VIRT_BASE + (x))
197 #define PCI_MODE ORION5X_PCI_REG(0xd00)
198 #define PCI_CMD ORION5X_PCI_REG(0xc00)
199 #define PCI_P2P_CONF ORION5X_PCI_REG(0x1d14)
200 #define PCI_CONF_ADDR ORION5X_PCI_REG(0xc78)
201 #define PCI_CONF_DATA ORION5X_PCI_REG(0xc7c)
206 #define PCI_MODE_64BIT (1 << 2)
207 #define PCI_MODE_PCIX ((1 << 4) | (1 << 5))
212 #define PCI_CMD_HOST_REORDER (1 << 29)
217 #define PCI_P2P_BUS_OFFS 16
218 #define PCI_P2P_BUS_MASK (0xff << PCI_P2P_BUS_OFFS)
219 #define PCI_P2P_DEV_OFFS 24
220 #define PCI_P2P_DEV_MASK (0x1f << PCI_P2P_DEV_OFFS)
225 #define PCI_CONF_REG(reg) ((reg) & 0xfc)
226 #define PCI_CONF_FUNC(func) (((func) & 0x3) << 8)
227 #define PCI_CONF_DEV(dev) (((dev) & 0x1f) << 11)
228 #define PCI_CONF_BUS(bus) (((bus) & 0xff) << 16)
229 #define PCI_CONF_ADDR_EN (1 << 31)
232 * Internal configuration space
234 #define PCI_CONF_FUNC_STAT_CMD 0
235 #define PCI_CONF_REG_STAT_CMD 4
236 #define PCIX_STAT 0x64
237 #define PCIX_STAT_BUS_OFFS 8
238 #define PCIX_STAT_BUS_MASK (0xff << PCIX_STAT_BUS_OFFS)
241 * PCI Address Decode Windows registers
243 #define PCI_BAR_SIZE_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
244 ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
245 ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
246 ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : NULL)
247 #define PCI_BAR_REMAP_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
248 ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
249 ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
250 ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : NULL)
251 #define PCI_BAR_ENABLE ORION5X_PCI_REG(0xc3c)
252 #define PCI_ADDR_DECODE_CTRL ORION5X_PCI_REG(0xd3c)
255 * PCI configuration helpers for BAR settings
257 #define PCI_CONF_FUNC_BAR_CS(n) ((n) >> 1)
258 #define PCI_CONF_REG_BAR_LO_CS(n) (((n) & 1) ? 0x18 : 0x10)
259 #define PCI_CONF_REG_BAR_HI_CS(n) (((n) & 1) ? 0x1c : 0x14)
262 * PCI config cycles are done by programming the PCI_CONF_ADDR register
263 * and then reading the PCI_CONF_DATA register. Need to make sure these
264 * transactions are atomic.
266 static DEFINE_SPINLOCK(orion5x_pci_lock);
268 static int orion5x_pci_cardbus_mode;
270 static int orion5x_pci_local_bus_nr(void)
272 u32 conf = readl(PCI_P2P_CONF);
273 return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
276 static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
277 u32 where, u32 size, u32 *val)
280 spin_lock_irqsave(&orion5x_pci_lock, flags);
282 writel(PCI_CONF_BUS(bus) |
283 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
284 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
286 *val = readl(PCI_CONF_DATA);
289 *val = (*val >> (8*(where & 0x3))) & 0xff;
291 *val = (*val >> (8*(where & 0x3))) & 0xffff;
293 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
295 return PCIBIOS_SUCCESSFUL;
298 static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
299 u32 where, u32 size, u32 val)
302 int ret = PCIBIOS_SUCCESSFUL;
304 spin_lock_irqsave(&orion5x_pci_lock, flags);
306 writel(PCI_CONF_BUS(bus) |
307 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
308 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
311 __raw_writel(val, PCI_CONF_DATA);
312 } else if (size == 2) {
313 __raw_writew(val, PCI_CONF_DATA + (where & 0x3));
314 } else if (size == 1) {
315 __raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
317 ret = PCIBIOS_BAD_REGISTER_NUMBER;
320 spin_unlock_irqrestore(&orion5x_pci_lock, flags);
325 static int orion5x_pci_valid_config(int bus, u32 devfn)
327 if (bus == orion5x_pci_local_bus_nr()) {
329 * Don't go out for local device
331 if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
335 * When the PCI signals are directly connected to a
336 * Cardbus slot, ignore all but device IDs 0 and 1.
338 if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1)
345 static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
346 int where, int size, u32 *val)
348 if (!orion5x_pci_valid_config(bus->number, devfn)) {
350 return PCIBIOS_DEVICE_NOT_FOUND;
353 return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
354 PCI_FUNC(devfn), where, size, val);
357 static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
358 int where, int size, u32 val)
360 if (!orion5x_pci_valid_config(bus->number, devfn))
361 return PCIBIOS_DEVICE_NOT_FOUND;
363 return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
364 PCI_FUNC(devfn), where, size, val);
367 static struct pci_ops pci_ops = {
368 .read = orion5x_pci_rd_conf,
369 .write = orion5x_pci_wr_conf,
372 static void __init orion5x_pci_set_bus_nr(int nr)
374 u32 p2p = readl(PCI_P2P_CONF);
376 if (readl(PCI_MODE) & PCI_MODE_PCIX) {
380 u32 pcix_status, bus, dev;
381 bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
382 dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
383 orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
384 pcix_status &= ~PCIX_STAT_BUS_MASK;
385 pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
386 orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
389 * PCI Conventional mode
391 p2p &= ~PCI_P2P_BUS_MASK;
392 p2p |= (nr << PCI_P2P_BUS_OFFS);
393 writel(p2p, PCI_P2P_CONF);
397 static void __init orion5x_pci_master_slave_enable(void)
399 int bus_nr, func, reg;
402 bus_nr = orion5x_pci_local_bus_nr();
403 func = PCI_CONF_FUNC_STAT_CMD;
404 reg = PCI_CONF_REG_STAT_CMD;
405 orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
406 val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
407 orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
410 static void __init orion5x_setup_pci_wins(void)
412 const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
418 * First, disable windows.
420 win_enable = 0xffffffff;
421 writel(win_enable, PCI_BAR_ENABLE);
424 * Setup windows for DDR banks.
426 bus = orion5x_pci_local_bus_nr();
428 for (i = 0; i < dram->num_cs; i++) {
429 const struct mbus_dram_window *cs = dram->cs + i;
430 u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
435 * Write DRAM bank base address register.
437 reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
438 orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
439 val = (cs->base & 0xfffff000) | (val & 0xfff);
440 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
443 * Write DRAM bank size register.
445 reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
446 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
447 writel((cs->size - 1) & 0xfffff000,
448 PCI_BAR_SIZE_DDR_CS(cs->cs_index));
449 writel(cs->base & 0xfffff000,
450 PCI_BAR_REMAP_DDR_CS(cs->cs_index));
453 * Enable decode window for this chip select.
455 win_enable &= ~(1 << cs->cs_index);
459 * Re-enable decode windows.
461 writel(win_enable, PCI_BAR_ENABLE);
464 * Disable automatic update of address remapping when writing to BARs.
466 orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
469 static int __init pci_setup(struct pci_sys_data *sys)
471 struct resource *res;
472 struct resource realio;
475 * Point PCI unit MBUS decode windows to DRAM space.
477 orion5x_setup_pci_wins();
480 * Master + Slave enable
482 orion5x_pci_master_slave_enable();
487 orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
489 realio.start = sys->busnr * SZ_64K;
490 realio.end = realio.start + SZ_64K - 1;
491 pci_remap_iospace(&realio, ORION5X_PCI_IO_PHYS_BASE);
496 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
498 panic("pci_setup unable to alloc resources");
503 res->name = "PCI Memory Space";
504 res->flags = IORESOURCE_MEM;
505 res->start = ORION5X_PCI_MEM_PHYS_BASE;
506 res->end = res->start + ORION5X_PCI_MEM_SIZE - 1;
507 if (request_resource(&iomem_resource, res))
508 panic("Request PCI Memory resource failed\n");
509 pci_add_resource_offset(&sys->resources, res, sys->mem_offset);
515 /*****************************************************************************
517 ****************************************************************************/
518 static void rc_pci_fixup(struct pci_dev *dev)
521 * Prevent enumeration of root complex.
523 if (dev->bus->parent == NULL && dev->devfn == 0) {
526 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
527 dev->resource[i].start = 0;
528 dev->resource[i].end = 0;
529 dev->resource[i].flags = 0;
533 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
535 static int orion5x_pci_disabled __initdata;
537 void __init orion5x_pci_disable(void)
539 orion5x_pci_disabled = 1;
542 void __init orion5x_pci_set_cardbus_mode(void)
544 orion5x_pci_cardbus_mode = 1;
547 int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
549 vga_base = ORION5X_PCIE_MEM_PHYS_BASE;
552 orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
553 return pcie_setup(sys);
556 if (nr == 1 && !orion5x_pci_disabled) {
557 orion5x_pci_set_bus_nr(sys->busnr);
558 return pci_setup(sys);
564 int __init orion5x_pci_sys_scan_bus(int nr, struct pci_host_bridge *bridge)
566 struct pci_sys_data *sys = pci_host_bridge_priv(bridge);
568 list_splice_init(&sys->resources, &bridge->windows);
569 bridge->dev.parent = NULL;
570 bridge->sysdata = sys;
571 bridge->busnr = sys->busnr;
574 bridge->ops = &pcie_ops;
575 return pci_scan_root_bus_bridge(bridge);
578 if (nr == 1 && !orion5x_pci_disabled) {
579 bridge->ops = &pci_ops;
580 return pci_scan_root_bus_bridge(bridge);
587 int __init orion5x_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
589 int bus = dev->bus->number;
594 if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr())
595 return IRQ_ORION5X_PCIE0_INT;