1 // SPDX-License-Identifier: GPL-2.0+
4 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
5 * Marius Groeger <mgroeger@sysgo.de>
8 * David Mueller, ELSOFT AG, <d.mueller@elsoft.ch>
11 * Texas Instruments, <www.ti.com>
12 * Kshitij Gupta <Kshitij@ti.com>
16 * Philippe Robin, <philippe.robin@arm.com>
20 * Linus Walleij <linus.walleij@linaro.org>
27 #include <linux/bug.h>
28 #include "integrator-sc.h"
31 #define INTEGRATOR_BOOT_ROM_BASE 0x20000000
32 #define INTEGRATOR_HDR0_SDRAM_BASE 0x80000000
35 * These are in the physical addresses on the CPU side, i.e.
36 * where we read and write stuff - you don't want to try to
39 #define PHYS_PCI_MEM_BASE 0x40000000
40 #define PHYS_PCI_IO_BASE 0x60000000 /* PCI I/O space base */
41 #define PHYS_PCI_CONFIG_BASE 0x61000000
42 #define PHYS_PCI_V3_BASE 0x62000000 /* V360EPC registers */
43 #define SZ_256M 0x10000000
46 * These are in the PCI BUS address space
47 * Set to 0x00000000 in the Linux kernel, 0x40000000 in Boot monitor
48 * we follow the example of the kernel, because that is the address
49 * range that devices actually use - what would they be doing at
52 #define PCI_BUS_NONMEM_START 0x00000000
53 #define PCI_BUS_NONMEM_SIZE SZ_256M
55 #define PCI_BUS_PREMEM_START (PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE)
56 #define PCI_BUS_PREMEM_SIZE SZ_256M
58 #if PCI_BUS_NONMEM_START & 0x000fffff
59 #error PCI_BUS_NONMEM_START must be megabyte aligned
61 #if PCI_BUS_PREMEM_START & 0x000fffff
62 #error PCI_BUS_PREMEM_START must be megabyte aligned
66 * Initialize PCI Devices, report devices found.
69 #ifndef CONFIG_PCI_PNP
70 #define PCI_ENET0_IOADDR 0x60000000 /* First card in PCI I/O space */
71 #define PCI_ENET0_MEMADDR 0x40000000 /* First card in PCI memory space */
72 static struct pci_config_table pci_integrator_config_table[] = {
73 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, 0x0f, PCI_ANY_ID,
74 pci_cfgfunc_config_device, { PCI_ENET0_IOADDR,
76 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER }},
79 #endif /* CONFIG_PCI_PNP */
81 /* V3 access routines */
82 #define v3_writeb(o, v) __raw_writeb(v, PHYS_PCI_V3_BASE + (unsigned int)(o))
83 #define v3_readb(o) (__raw_readb(PHYS_PCI_V3_BASE + (unsigned int)(o)))
85 #define v3_writew(o, v) __raw_writew(v, PHYS_PCI_V3_BASE + (unsigned int)(o))
86 #define v3_readw(o) (__raw_readw(PHYS_PCI_V3_BASE + (unsigned int)(o)))
88 #define v3_writel(o, v) __raw_writel(v, PHYS_PCI_V3_BASE + (unsigned int)(o))
89 #define v3_readl(o) (__raw_readl(PHYS_PCI_V3_BASE + (unsigned int)(o)))
91 static unsigned long v3_open_config_window(pci_dev_t bdf, int offset)
93 unsigned int address, mapaddress;
94 unsigned int busnr = PCI_BUS(bdf);
95 unsigned int devfn = PCI_FUNC(bdf);
98 * Trap out illegal values
109 * Linux calls the thing U-Boot calls "DEV" "SLOT"
110 * instead, but it's the same 5 bits
112 int slot = PCI_DEV(bdf);
115 * local bus segment so need a type 0 config cycle
117 * build the PCI configuration "address" with one-hot in
121 * 3:1 = config cycle (101)
122 * 0 = PCI A1 & A0 are 0 (0)
124 address = PCI_FUNC(bdf) << 8;
125 mapaddress = V3_LB_MAP_TYPE_CONFIG;
129 * high order bits are handled by the MAP register
131 mapaddress |= 1 << (slot - 5);
134 * low order bits handled directly in the address
136 address |= 1 << (slot + 11);
139 * not the local bus segment so need a type 1 config cycle
143 * 15:11 = slot number (7:3 of devfn)
144 * 10:8 = func number (2:0 of devfn)
147 * 3:1 = config cycle (101)
148 * 0 = PCI A1 & A0 from host bus (1)
150 mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN;
151 address = (busnr << 16) | (devfn << 8);
155 * Set up base0 to see all 512Mbytes of memory space (not
156 * prefetchable), this frees up base1 for re-use by
157 * configuration memory
159 v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
160 V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE);
163 * Set up base1/map1 to point into configuration space.
165 v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_CONFIG_BASE) |
166 V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE);
167 v3_writew(V3_LB_MAP1, mapaddress);
169 return PHYS_PCI_CONFIG_BASE + address + offset;
172 static void v3_close_config_window(void)
175 * Reassign base1 for use by prefetchable PCI memory
177 v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
178 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
180 v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
181 V3_LB_MAP_TYPE_MEM_MULTIPLE);
184 * And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
186 v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
187 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
190 static int pci_integrator_read_byte(struct pci_controller *hose, pci_dev_t bdf,
191 int offset, unsigned char *val)
195 addr = v3_open_config_window(bdf, offset);
196 *val = __raw_readb(addr);
197 v3_close_config_window();
201 static int pci_integrator_read__word(struct pci_controller *hose,
202 pci_dev_t bdf, int offset,
207 addr = v3_open_config_window(bdf, offset);
208 *val = __raw_readw(addr);
209 v3_close_config_window();
213 static int pci_integrator_read_dword(struct pci_controller *hose,
214 pci_dev_t bdf, int offset,
219 addr = v3_open_config_window(bdf, offset);
220 *val = __raw_readl(addr);
221 v3_close_config_window();
225 static int pci_integrator_write_byte(struct pci_controller *hose,
226 pci_dev_t bdf, int offset,
231 addr = v3_open_config_window(bdf, offset);
232 __raw_writeb((u8)val, addr);
234 v3_close_config_window();
238 static int pci_integrator_write_word(struct pci_controller *hose,
239 pci_dev_t bdf, int offset,
244 addr = v3_open_config_window(bdf, offset);
245 __raw_writew((u8)val, addr);
247 v3_close_config_window();
251 static int pci_integrator_write_dword(struct pci_controller *hose,
252 pci_dev_t bdf, int offset,
257 addr = v3_open_config_window(bdf, offset);
258 __raw_writel((u8)val, addr);
260 v3_close_config_window();
264 struct pci_controller integrator_hose = {
265 #ifndef CONFIG_PCI_PNP
266 config_table: pci_integrator_config_table,
270 void pci_init_board(void)
272 struct pci_controller *hose = &integrator_hose;
275 /* setting this register will take the V3 out of reset */
276 __raw_writel(SC_PCI_PCIEN, SC_PCI);
278 /* Wait for 230 ms (from spec) before accessing any V3 registers */
281 /* Now write the Base I/O Address Word to PHYS_PCI_V3_BASE + 0x6E */
282 v3_writew(V3_LB_IO_BASE, (PHYS_PCI_V3_BASE >> 16));
284 /* Wait for the mailbox to settle */
286 v3_writeb(V3_MAIL_DATA, 0xAA);
287 v3_writeb(V3_MAIL_DATA + 4, 0x55);
288 } while (v3_readb(V3_MAIL_DATA) != 0xAA ||
289 v3_readb(V3_MAIL_DATA + 4) != 0x55);
291 /* Make sure that V3 register access is not locked, if it is, unlock it */
292 if (v3_readw(V3_SYSTEM) & V3_SYSTEM_M_LOCK)
293 v3_writew(V3_SYSTEM, 0xA05F);
296 * Ensure that the slave accesses from PCI are disabled while we
297 * setup memory windows
299 val = v3_readw(V3_PCI_CMD);
300 val &= ~(V3_COMMAND_M_MEM_EN | V3_COMMAND_M_IO_EN);
301 v3_writew(V3_PCI_CMD, val);
303 /* Clear RST_OUT to 0; keep the PCI bus in reset until we've finished */
304 val = v3_readw(V3_SYSTEM);
305 val &= ~V3_SYSTEM_M_RST_OUT;
306 v3_writew(V3_SYSTEM, val);
308 /* Make all accesses from PCI space retry until we're ready for them */
309 val = v3_readw(V3_PCI_CFG);
310 val |= V3_PCI_CFG_M_RETRY_EN;
311 v3_writew(V3_PCI_CFG, val);
314 * Set up any V3 PCI Configuration Registers that we absolutely have to.
315 * LB_CFG controls Local Bus protocol.
316 * Enable LocalBus byte strobes for READ accesses too.
317 * set bit 7 BE_IMODE and bit 6 BE_OMODE
319 val = v3_readw(V3_LB_CFG);
321 v3_writew(V3_LB_CFG, val);
323 /* PCI_CMD controls overall PCI operation. Enable PCI bus master. */
324 val = v3_readw(V3_PCI_CMD);
325 val |= V3_COMMAND_M_MASTER_EN;
326 v3_writew(V3_PCI_CMD, val);
329 * PCI_MAP0 controls where the PCI to CPU memory window is on
332 v3_writel(V3_PCI_MAP0,
333 (INTEGRATOR_BOOT_ROM_BASE) | (V3_PCI_MAP_M_ADR_SIZE_512MB |
334 V3_PCI_MAP_M_REG_EN |
335 V3_PCI_MAP_M_ENABLE));
337 /* PCI_BASE0 is the PCI address of the start of the window */
338 v3_writel(V3_PCI_BASE0, INTEGRATOR_BOOT_ROM_BASE);
340 /* PCI_MAP1 is LOCAL address of the start of the window */
341 v3_writel(V3_PCI_MAP1,
342 (INTEGRATOR_HDR0_SDRAM_BASE) | (V3_PCI_MAP_M_ADR_SIZE_1GB |
343 V3_PCI_MAP_M_REG_EN |
344 V3_PCI_MAP_M_ENABLE));
346 /* PCI_BASE1 is the PCI address of the start of the window */
347 v3_writel(V3_PCI_BASE1, INTEGRATOR_HDR0_SDRAM_BASE);
350 * Set up memory the windows from local bus memory into PCI
351 * configuration, I/O and Memory regions.
352 * PCI I/O, LB_BASE2 and LB_MAP2 are used exclusively for this.
354 v3_writew(V3_LB_BASE2,
355 v3_addr_to_lb_map(PHYS_PCI_IO_BASE) | V3_LB_BASE_ENABLE);
356 v3_writew(V3_LB_MAP2, 0);
358 /* PCI Configuration, use LB_BASE1/LB_MAP1. */
361 * PCI Memory use LB_BASE0/LB_MAP0 and LB_BASE1/LB_MAP1
362 * Map first 256Mbytes as non-prefetchable via BASE0/MAP0
364 v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
365 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
366 v3_writew(V3_LB_MAP0,
367 v3_addr_to_lb_map(PCI_BUS_NONMEM_START) | V3_LB_MAP_TYPE_MEM);
369 /* Map second 256 Mbytes as prefetchable via BASE1/MAP1 */
370 v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
371 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
373 v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
374 V3_LB_MAP_TYPE_MEM_MULTIPLE);
376 /* Dump PCI to local address space mappings */
377 debug("LB_BASE0 = %08x\n", v3_readl(V3_LB_BASE0));
378 debug("LB_MAP0 = %04x\n", v3_readw(V3_LB_MAP0));
379 debug("LB_BASE1 = %08x\n", v3_readl(V3_LB_BASE1));
380 debug("LB_MAP1 = %04x\n", v3_readw(V3_LB_MAP1));
381 debug("LB_BASE2 = %04x\n", v3_readw(V3_LB_BASE2));
382 debug("LB_MAP2 = %04x\n", v3_readw(V3_LB_MAP2));
383 debug("LB_IO_BASE = %04x\n", v3_readw(V3_LB_IO_BASE));
386 * Allow accesses to PCI Configuration space and set up A1, A0 for
387 * type 1 config cycles
389 val = v3_readw(V3_PCI_CFG);
390 val &= ~(V3_PCI_CFG_M_RETRY_EN | V3_PCI_CFG_M_AD_LOW1);
391 val |= V3_PCI_CFG_M_AD_LOW0;
392 v3_writew(V3_PCI_CFG, val);
394 /* now we can allow incoming PCI MEMORY accesses */
395 val = v3_readw(V3_PCI_CMD);
396 val |= V3_COMMAND_M_MEM_EN;
397 v3_writew(V3_PCI_CMD, val);
400 * Set RST_OUT to take the PCI bus is out of reset, PCI devices can
403 val = v3_readw(V3_SYSTEM);
404 val |= V3_SYSTEM_M_RST_OUT;
405 v3_writew(V3_SYSTEM, val);
407 /* Lock the V3 system register so that no one else can play with it */
408 val = v3_readw(V3_SYSTEM);
409 val |= V3_SYSTEM_M_LOCK;
410 v3_writew(V3_SYSTEM, val);
413 * Configure and register the PCI hose
415 hose->first_busno = 0;
416 hose->last_busno = 0xff;
418 /* System memory space, window 0 256 MB non-prefetchable */
419 pci_set_region(hose->regions + 0,
420 PCI_BUS_NONMEM_START, PHYS_PCI_MEM_BASE,
424 /* System memory space, window 1 256 MB prefetchable */
425 pci_set_region(hose->regions + 1,
426 PCI_BUS_PREMEM_START, PHYS_PCI_MEM_BASE + SZ_256M,
429 PCI_REGION_PREFETCH);
432 pci_set_region(hose->regions + 2,
433 0x00000000, PHYS_PCI_IO_BASE, 0x01000000,
436 /* PCI Memory - config space */
437 pci_set_region(hose->regions + 3,
438 0x00000000, PHYS_PCI_CONFIG_BASE, 0x01000000,
441 pci_set_region(hose->regions + 4,
442 0x00000000, PHYS_PCI_V3_BASE, 0x01000000,
445 hose->region_count = 5;
448 pci_integrator_read_byte,
449 pci_integrator_read__word,
450 pci_integrator_read_dword,
451 pci_integrator_write_byte,
452 pci_integrator_write_word,
453 pci_integrator_write_dword);
455 pci_register_hose(hose);
457 pciauto_config_init(hose);
458 pciauto_config_device(hose, 0);
460 hose->last_busno = pci_hose_scan(hose);