2 * PCI code for the Freescale MPC52xx embedded CPU.
4 * Copyright (C) 2006 Secret Lab Technologies Ltd.
5 * Grant Likely <grant.likely@secretlab.ca>
6 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
8 * This file is licensed under the terms of the GNU General Public License
9 * version 2. This program is licensed "as is" without any warranty of any
10 * kind, whether express or implied.
16 #include <asm/mpc52xx.h>
17 #include <asm/delay.h>
18 #include <asm/machdep.h>
19 #include <linux/kernel.h>
22 /* ======================================================================== */
23 /* PCI windows config */
24 /* ======================================================================== */
26 #define MPC52xx_PCI_TARGET_IO 0xf0000000
27 #define MPC52xx_PCI_TARGET_MEM 0x00000000
30 /* ======================================================================== */
31 /* Structures mapping & Defines for PCI Unit */
32 /* ======================================================================== */
34 #define MPC52xx_PCI_GSCR_BM 0x40000000
35 #define MPC52xx_PCI_GSCR_PE 0x20000000
36 #define MPC52xx_PCI_GSCR_SE 0x10000000
37 #define MPC52xx_PCI_GSCR_XLB2PCI_MASK 0x07000000
38 #define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT 24
39 #define MPC52xx_PCI_GSCR_IPG2PCI_MASK 0x00070000
40 #define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT 16
41 #define MPC52xx_PCI_GSCR_BME 0x00004000
42 #define MPC52xx_PCI_GSCR_PEE 0x00002000
43 #define MPC52xx_PCI_GSCR_SEE 0x00001000
44 #define MPC52xx_PCI_GSCR_PR 0x00000001
47 #define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size) \
48 ( ( (proc_ad) & 0xff000000 ) | \
49 ( (((size) - 1) >> 8) & 0x00ff0000 ) | \
50 ( ((pci_ad) >> 16) & 0x0000ff00 ) )
52 #define MPC52xx_PCI_IWCR_PACK(win0,win1,win2) (((win0) << 24) | \
56 #define MPC52xx_PCI_IWCR_DISABLE 0x0
57 #define MPC52xx_PCI_IWCR_ENABLE 0x1
58 #define MPC52xx_PCI_IWCR_READ 0x0
59 #define MPC52xx_PCI_IWCR_READ_LINE 0x2
60 #define MPC52xx_PCI_IWCR_READ_MULTI 0x4
61 #define MPC52xx_PCI_IWCR_MEM 0x0
62 #define MPC52xx_PCI_IWCR_IO 0x8
64 #define MPC52xx_PCI_TCR_P 0x01000000
65 #define MPC52xx_PCI_TCR_LD 0x00010000
67 #define MPC52xx_PCI_TBATR_DISABLE 0x0
68 #define MPC52xx_PCI_TBATR_ENABLE 0x1
71 u32 idr; /* PCI + 0x00 */
72 u32 scr; /* PCI + 0x04 */
73 u32 ccrir; /* PCI + 0x08 */
74 u32 cr1; /* PCI + 0x0C */
75 u32 bar0; /* PCI + 0x10 */
76 u32 bar1; /* PCI + 0x14 */
77 u8 reserved1[16]; /* PCI + 0x18 */
78 u32 ccpr; /* PCI + 0x28 */
79 u32 sid; /* PCI + 0x2C */
80 u32 erbar; /* PCI + 0x30 */
81 u32 cpr; /* PCI + 0x34 */
82 u8 reserved2[4]; /* PCI + 0x38 */
83 u32 cr2; /* PCI + 0x3C */
84 u8 reserved3[32]; /* PCI + 0x40 */
85 u32 gscr; /* PCI + 0x60 */
86 u32 tbatr0; /* PCI + 0x64 */
87 u32 tbatr1; /* PCI + 0x68 */
88 u32 tcr; /* PCI + 0x6C */
89 u32 iw0btar; /* PCI + 0x70 */
90 u32 iw1btar; /* PCI + 0x74 */
91 u32 iw2btar; /* PCI + 0x78 */
92 u8 reserved4[4]; /* PCI + 0x7C */
93 u32 iwcr; /* PCI + 0x80 */
94 u32 icr; /* PCI + 0x84 */
95 u32 isr; /* PCI + 0x88 */
96 u32 arb; /* PCI + 0x8C */
97 u8 reserved5[104]; /* PCI + 0x90 */
98 u32 car; /* PCI + 0xF8 */
99 u8 reserved6[4]; /* PCI + 0xFC */
103 /* ======================================================================== */
104 /* PCI configuration acess */
105 /* ======================================================================== */
108 mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
109 int offset, int len, u32 *val)
111 struct pci_controller *hose = bus->sysdata;
114 if (ppc_md.pci_exclude_device)
115 if (ppc_md.pci_exclude_device(bus->number, devfn))
116 return PCIBIOS_DEVICE_NOT_FOUND;
118 out_be32(hose->cfg_addr,
120 ((bus->number - hose->bus_offset) << 16) |
125 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
126 if (bus->number != hose->bus_offset) {
127 /* workaround for the bug 435 of the MPC5200 (L25R);
128 * Don't do 32 bits config access during type-1 cycles */
131 value = in_8(((u8 __iomem *)hose->cfg_data) +
135 value = in_le16(((u16 __iomem *)hose->cfg_data) +
140 value = in_le16((u16 __iomem *)hose->cfg_data) |
141 (in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
148 value = in_le32(hose->cfg_data);
151 value >>= ((offset & 0x3) << 3);
152 value &= 0xffffffff >> (32 - (len << 3));
158 out_be32(hose->cfg_addr, 0);
161 return PCIBIOS_SUCCESSFUL;
165 mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
166 int offset, int len, u32 val)
168 struct pci_controller *hose = bus->sysdata;
171 if (ppc_md.pci_exclude_device)
172 if (ppc_md.pci_exclude_device(bus->number, devfn))
173 return PCIBIOS_DEVICE_NOT_FOUND;
175 out_be32(hose->cfg_addr,
177 ((bus->number - hose->bus_offset) << 16) |
182 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
183 if (bus->number != hose->bus_offset) {
184 /* workaround for the bug 435 of the MPC5200 (L25R);
185 * Don't do 32 bits config access during type-1 cycles */
188 out_8(((u8 __iomem *)hose->cfg_data) +
192 out_le16(((u16 __iomem *)hose->cfg_data) +
193 ((offset>>1) & 1), val);
197 out_le16((u16 __iomem *)hose->cfg_data,
199 out_le16(((u16 __iomem *)hose->cfg_data) + 1,
208 value = in_le32(hose->cfg_data);
210 offset = (offset & 0x3) << 3;
211 mask = (0xffffffff >> (32 - (len << 3)));
215 val = value | ((val << offset) & mask);
218 out_le32(hose->cfg_data, val);
222 out_be32(hose->cfg_addr, 0);
225 return PCIBIOS_SUCCESSFUL;
228 static struct pci_ops mpc52xx_pci_ops = {
229 .read = mpc52xx_pci_read_config,
230 .write = mpc52xx_pci_write_config
234 /* ======================================================================== */
236 /* ======================================================================== */
239 mpc52xx_pci_setup(struct pci_controller *hose,
240 struct mpc52xx_pci __iomem *pci_regs)
242 struct resource *res;
244 int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0;
246 pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs);
248 /* pci_process_bridge_OF_ranges() found all our addresses for us;
249 * now store them in the right places */
250 hose->cfg_addr = &pci_regs->car;
251 hose->cfg_data = hose->io_base_virt;
254 tmp = in_be32(&pci_regs->scr);
255 tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
256 out_be32(&pci_regs->scr, tmp);
259 res = &hose->mem_resources[0];
261 pr_debug("mem_resource[0] = {.start=%x, .end=%x, .flags=%lx}\n",
262 res->start, res->end, res->flags);
263 out_be32(&pci_regs->iw0btar,
264 MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
265 res->end - res->start + 1));
266 iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
267 if (res->flags & IORESOURCE_PREFETCH)
268 iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI;
270 iwcr0 |= MPC52xx_PCI_IWCR_READ;
273 res = &hose->mem_resources[1];
275 pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n",
276 res->start, res->end, res->flags);
277 out_be32(&pci_regs->iw1btar,
278 MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
279 res->end - res->start + 1));
280 iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
281 if (res->flags & IORESOURCE_PREFETCH)
282 iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI;
284 iwcr1 |= MPC52xx_PCI_IWCR_READ;
288 res = &hose->io_resource;
290 printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__);
293 pr_debug(".io_resource={.start=%x,.end=%x,.flags=%lx} "
294 ".io_base_phys=0x%p\n",
295 res->start, res->end, res->flags, (void*)hose->io_base_phys);
296 out_be32(&pci_regs->iw2btar,
297 MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys,
299 res->end - res->start + 1));
300 iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO;
302 /* Set all the IWCR fields at once; they're in the same reg */
303 out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));
305 out_be32(&pci_regs->tbatr0,
306 MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_IO );
307 out_be32(&pci_regs->tbatr1,
308 MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_MEM );
310 out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD);
312 tmp = in_be32(&pci_regs->gscr);
314 /* Reset the exteral bus ( internal PCI controller is NOT resetted ) */
315 /* Not necessary and can be a bad thing if for example the bootloader
316 is displaying a splash screen or ... Just left here for
317 documentation purpose if anyone need it */
318 out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
322 /* Make sure the PCI bridge is out of reset */
323 out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
327 mpc52xx_pci_fixup_resources(struct pci_dev *dev)
331 pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n",
332 dev->vendor, dev->device);
334 /* We don't rely on boot loader for PCI and resets all
336 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
337 struct resource *res = &dev->resource[i];
338 if (res->end > res->start) { /* Only valid resources */
339 res->end -= res->start;
341 res->flags |= IORESOURCE_UNSET;
345 /* The PCI Host bridge of MPC52xx has a prefetch memory resource
346 fixed to 1Gb. Doesn't fit in the resource system so we remove it */
347 if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
348 ( dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200
349 || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
350 struct resource *res = &dev->resource[1];
351 res->start = res->end = res->flags = 0;
356 mpc52xx_add_bridge(struct device_node *node)
359 struct mpc52xx_pci __iomem *pci_regs;
360 struct pci_controller *hose;
361 const int *bus_range;
362 struct resource rsrc;
364 pr_debug("Adding MPC52xx PCI host bridge %s\n", node->full_name);
366 pci_assign_all_buses = 1;
368 if (of_address_to_resource(node, 0, &rsrc) != 0) {
369 printk(KERN_ERR "Can't get %s resources\n", node->full_name);
373 bus_range = of_get_property(node, "bus-range", &len);
374 if (bus_range == NULL || len < 2 * sizeof(int)) {
375 printk(KERN_WARNING "Can't get %s bus-range, assume bus 0\n",
380 /* There are some PCI quirks on the 52xx, register the hook to
382 ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
384 /* Alloc and initialize the pci controller. Values in the device
385 * tree are needed to configure the 52xx PCI controller. Rather
386 * than parse the tree here, let pci_process_bridge_OF_ranges()
387 * do it for us and extract the values after the fact */
388 hose = pcibios_alloc_controller();
392 hose->arch_data = node;
394 hose->first_busno = bus_range ? bus_range[0] : 0;
395 hose->last_busno = bus_range ? bus_range[1] : 0xff;
397 hose->bus_offset = 0;
398 hose->ops = &mpc52xx_pci_ops;
400 pci_regs = ioremap(rsrc.start, rsrc.end - rsrc.start + 1);
404 pci_process_bridge_OF_ranges(hose, node, 1);
406 /* Finish setting up PCI using values obtained by
407 * pci_proces_bridge_OF_ranges */
408 mpc52xx_pci_setup(hose, pci_regs);