2 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
4 * May be copied or modified under the terms of the GNU General Public
5 * License. See linux/COPYING for more information.
7 * Support functions for the ST40 PCI hardware.
10 #include <linux/kernel.h>
11 #include <linux/smp.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <linux/pci.h>
15 #include <linux/delay.h>
16 #include <linux/types.h>
18 #include <linux/irq.h>
19 #include <linux/interrupt.h> /* irqreturn_t */
23 /* This is in P2 of course */
24 #define ST40PCI_BASE_ADDRESS (0xb0000000)
25 #define ST40PCI_MEM_ADDRESS (ST40PCI_BASE_ADDRESS+0x0)
26 #define ST40PCI_IO_ADDRESS (ST40PCI_BASE_ADDRESS+0x06000000)
27 #define ST40PCI_REG_ADDRESS (ST40PCI_BASE_ADDRESS+0x07000000)
29 #define ST40PCI_REG(x) (ST40PCI_REG_ADDRESS+(ST40PCI_##x))
30 #define ST40PCI_REG_INDEXED(reg, index) \
31 (ST40PCI_REG(reg##0) + \
32 ((ST40PCI_REG(reg##1) - ST40PCI_REG(reg##0))*index))
34 #define ST40PCI_WRITE(reg,val) writel((val),ST40PCI_REG(reg))
35 #define ST40PCI_WRITE_SHORT(reg,val) writew((val),ST40PCI_REG(reg))
36 #define ST40PCI_WRITE_BYTE(reg,val) writeb((val),ST40PCI_REG(reg))
37 #define ST40PCI_WRITE_INDEXED(reg, index, val) \
38 writel((val), ST40PCI_REG_INDEXED(reg, index));
40 #define ST40PCI_READ(reg) readl(ST40PCI_REG(reg))
41 #define ST40PCI_READ_SHORT(reg) readw(ST40PCI_REG(reg))
42 #define ST40PCI_READ_BYTE(reg) readb(ST40PCI_REG(reg))
44 #define ST40PCI_SERR_IRQ 64
45 #define ST40PCI_ERR_IRQ 65
48 /* Macros to extract PLL params */
49 #define PLL_MDIV(reg) ( ((unsigned)reg) & 0xff )
50 #define PLL_NDIV(reg) ( (((unsigned)reg)>>8) & 0xff )
51 #define PLL_PDIV(reg) ( (((unsigned)reg)>>16) & 0x3 )
52 #define PLL_SETUP(reg) ( (((unsigned)reg)>>19) & 0x1ff )
54 /* Build up the appropriate settings */
55 #define PLL_SET(mdiv,ndiv,pdiv,setup) \
56 ( ((mdiv)&0xff) | (((ndiv)&0xff)<<8) | (((pdiv)&3)<<16)| (((setup)&0x1ff)<<19))
58 #define PLLPCICR (0xbb040000+0x10)
60 #define PLLPCICR_POWERON (1<<28)
61 #define PLLPCICR_OUT_EN (1<<29)
62 #define PLLPCICR_LOCKSELECT (1<<30)
63 #define PLLPCICR_LOCK (1<<31)
66 #define PLL_25MHZ 0x793c8512
67 #define PLL_33MHZ PLL_SET(18,88,3,295)
69 static void pci_set_rbar_region(unsigned int region, unsigned long localAddr,
70 unsigned long pciOffset, unsigned long regionSize);
72 static __init void SetPCIPLL(void)
75 /* Lets play with the PLL values */
76 unsigned long pll1cr1;
77 unsigned long mdiv, ndiv, pdiv;
79 unsigned int muxcr_ratios[4] = { 8, 16, 21, 1 };
82 #define CLKGENA 0xbb040000
83 #define CLKGENA_PLL2_MUXCR CLKGENA + 0x48
84 pll1cr1 = ctrl_inl(PLLPCICR);
85 printk("PLL1CR1 %08lx\n", pll1cr1);
86 mdiv = PLL_MDIV(pll1cr1);
87 ndiv = PLL_NDIV(pll1cr1);
88 pdiv = PLL_PDIV(pll1cr1);
89 printk("mdiv %02lx ndiv %02lx pdiv %02lx\n", mdiv, ndiv, pdiv);
90 freq = ((2*27*ndiv)/mdiv) / (1 << pdiv);
91 printk("PLL freq %dMHz\n", freq);
92 muxcr = ctrl_inl(CLKGENA_PLL2_MUXCR);
93 printk("PCI freq %dMhz\n", freq / muxcr_ratios[muxcr & 3]);
100 const char *error_string;
103 static struct pci_err int_error[]={
104 { INT_MNLTDIM,"MNLTDIM: Master non-lock transfer"},
105 { INT_TTADI, "TTADI: Illegal byte enable in I/O transfer"},
106 { INT_TMTO, "TMTO: Target memory read/write timeout"},
107 { INT_MDEI, "MDEI: Master function disable error"},
108 { INT_APEDI, "APEDI: Address parity error"},
109 { INT_SDI, "SDI: SERR detected"},
110 { INT_DPEITW, "DPEITW: Data parity error target write"},
111 { INT_PEDITR, "PEDITR: PERR detected"},
112 { INT_TADIM, "TADIM: Target abort detected"},
113 { INT_MADIM, "MADIM: Master abort detected"},
114 { INT_MWPDI, "MWPDI: PERR from target at data write"},
115 { INT_MRDPEI, "MRDPEI: Master read data parity error"}
117 #define NUM_PCI_INT_ERRS (sizeof(int_error)/sizeof(struct pci_err))
119 static struct pci_err aint_error[]={
120 { AINT_MBI, "MBI: Master broken"},
121 { AINT_TBTOI, "TBTOI: Target bus timeout"},
122 { AINT_MBTOI, "MBTOI: Master bus timeout"},
123 { AINT_TAI, "TAI: Target abort"},
124 { AINT_MAI, "MAI: Master abort"},
125 { AINT_RDPEI, "RDPEI: Read data parity"},
126 { AINT_WDPE, "WDPE: Write data parity"}
129 #define NUM_PCI_AINT_ERRS (sizeof(aint_error)/sizeof(struct pci_err))
131 static void print_pci_errors(unsigned reg,struct pci_err *error,int num_errors)
135 for(i=0;i<num_errors;i++) {
136 if(reg & error[i].mask) {
137 printk("%s\n",error[i].error_string);
144 static char * pci_commands[16]={
155 "Configuration Read",
156 "Configuration Write",
157 "Memory Read Multiple",
158 "Dual Address Cycle",
160 "Memory Write-and-Invalidate"
163 static irqreturn_t st40_pci_irq(int irq, void *dev_instance)
165 unsigned pci_int, pci_air, pci_cir, pci_aint;
169 pci_int = ST40PCI_READ(INT);pci_aint = ST40PCI_READ(AINT);
170 pci_cir = ST40PCI_READ(CIR);pci_air = ST40PCI_READ(AIR);
172 /* Reset state to stop multiple interrupts */
173 ST40PCI_WRITE(INT, ~0); ST40PCI_WRITE(AINT, ~0);
176 if(++count>1) return IRQ_HANDLED;
178 printk("** PCI ERROR **\n");
181 printk("** INT register status\n");
182 print_pci_errors(pci_int,int_error,NUM_PCI_INT_ERRS);
186 printk("** AINT register status\n");
187 print_pci_errors(pci_aint,aint_error,NUM_PCI_AINT_ERRS);
190 printk("** Address and command info\n");
192 printk("** Command %s : Address 0x%x\n",
193 pci_commands[pci_cir&0xf],pci_air);
195 if(pci_cir&CIR_PIOTEM) {
196 printk("CIR_PIOTEM:PIO transfer error for master\n");
198 if(pci_cir&CIR_RWTET) {
199 printk("CIR_RWTET:Read/Write transfer error for target\n");
206 /* Rounds a number UP to the nearest power of two. Used for
207 * sizing the PCI window.
209 static u32 r2p2(u32 num)
225 /* If the original number isn't a power of 2, round it up */
232 static void __init pci_fixup_ide_bases(struct pci_dev *d)
237 * PCI IDE controllers use non-standard I/O port decoding, respect it.
239 if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
241 printk("PCI: IDE base address fixup for %s\n", pci_name(d));
243 struct resource *r = &d->resource[i];
244 if ((r->start & ~0x80) == 0x374) {
250 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
252 int __init st40pci_init(unsigned memStart, unsigned memSize)
258 /* Initialises the ST40 pci subsystem, performing a reset, then programming
259 * up the address space decoders appropriately
262 /* Should reset core here as well methink */
264 ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_SOFT_RESET);
266 /* Loop while core resets */
267 while (ST40PCI_READ(CR) & CR_SOFT_RESET);
269 /* Switch off interrupts */
270 ST40PCI_WRITE(INTM, 0);
271 ST40PCI_WRITE(AINT, 0);
273 /* Now, lets reset all the cards on the bus with extreme prejudice */
274 ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_RSTCTL);
277 /* Set bus active, take it out of reset */
278 ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_BMAM | CR_CFINT | CR_PFCS | CR_PFE);
280 /* The PCI spec says that no access must be made to the bus until 1 second
281 * after reset. This seem ludicrously long, but some delay is needed here
285 /* Switch off interrupts */
286 ST40PCI_WRITE(INTM, 0);
287 ST40PCI_WRITE(AINT, 0);
289 /* Allow it to be a master */
291 ST40PCI_WRITE_SHORT(CSR_CMD,
292 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
295 /* Accesse to the 0xb0000000 -> 0xb6000000 area will go through to 0x10000000 -> 0x16000000
296 * on the PCI bus. This allows a nice 1-1 bus to phys mapping.
300 ST40PCI_WRITE(MBR, 0x10000000);
301 /* Always set the max size 128M (actually, it is only 96MB wide) */
302 ST40PCI_WRITE(MBMR, 0x07ff0000);
304 /* I/O addresses are mapped at 0xb6000000 -> 0xb7000000. These are changed to 0, to
305 * allow cards that have legacy io such as vga to function correctly. This gives a
306 * maximum of 64K of io/space as only the bottom 16 bits of the address are copied
307 * over to the bus when the transaction is made. 64K of io space is more than enough
309 ST40PCI_WRITE(IOBR, 0x0);
310 /* Set up the 64K window */
311 ST40PCI_WRITE(IOBMR, 0x0);
313 /* Now we set up the mbars so the PCI bus can see the local memory */
314 /* Expose a 256M window starting at PCI address 0... */
315 ST40PCI_WRITE(CSR_MBAR0, 0);
316 ST40PCI_WRITE(LSR0, 0x0fff0001);
318 /* ... and set up the initial incomming window to expose all of RAM */
319 pci_set_rbar_region(7, memStart, memStart, memSize);
321 /* Maximise timeout values */
322 ST40PCI_WRITE_BYTE(CSR_TRDY, 0xff);
323 ST40PCI_WRITE_BYTE(CSR_RETRY, 0xff);
324 ST40PCI_WRITE_BYTE(CSR_MIT, 0xff);
326 ST40PCI_WRITE_BYTE(PERF,PERF_MASTER_WRITE_POSTING);
331 char * __init pcibios_setup(char *str)
337 #define SET_CONFIG_BITS(bus,devfn,where)\
338 (((bus) << 16) | ((devfn) << 8) | ((where) & ~3) | (bus!=0))
340 #define CONFIG_CMD(bus, devfn, where) SET_CONFIG_BITS(bus->number,devfn,where)
343 static int CheckForMasterAbort(void)
345 if (ST40PCI_READ(INT) & INT_MADIM) {
346 /* Should we clear config space version as well ??? */
347 ST40PCI_WRITE(INT, INT_MADIM);
348 ST40PCI_WRITE_SHORT(CSR_STATUS, 0);
355 /* Write to config register */
356 static int st40pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
358 ST40PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
361 *val = (u8)ST40PCI_READ_BYTE(PDR + (where & 3));
364 *val = (u16)ST40PCI_READ_SHORT(PDR + (where & 2));
367 *val = ST40PCI_READ(PDR);
371 if (CheckForMasterAbort()){
385 return PCIBIOS_SUCCESSFUL;
388 static int st40pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
390 ST40PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
394 ST40PCI_WRITE_BYTE(PDR + (where & 3), (u8)val);
397 ST40PCI_WRITE_SHORT(PDR + (where & 2), (u16)val);
400 ST40PCI_WRITE(PDR, val);
404 CheckForMasterAbort();
406 return PCIBIOS_SUCCESSFUL;
409 struct pci_ops st40pci_config_ops = {
410 .read = st40pci_read,
411 .write = st40pci_write,
415 /* Everything hangs off this */
416 static struct pci_bus *pci_root_bus;
418 static int __init pcibios_init(void)
420 extern unsigned long memory_start, memory_end;
422 printk(KERN_ALERT "pci-st40.c: pcibios_init\n");
424 if (sh_mv.mv_init_pci != NULL) {
428 /* The pci subsytem needs to know where memory is and how much
429 * of it there is. I've simply made these globals. A better mechanism
430 * is probably needed.
432 st40pci_init(PHYSADDR(memory_start),
433 PHYSADDR(memory_end) - PHYSADDR(memory_start));
435 if (request_irq(ST40PCI_ERR_IRQ, st40_pci_irq,
436 IRQF_DISABLED, "st40pci", NULL)) {
437 printk(KERN_ERR "st40pci: Cannot hook interrupt\n");
441 /* Enable the PCI interrupts on the device */
442 ST40PCI_WRITE(INTM, ~0);
443 ST40PCI_WRITE(AINT, ~0);
445 /* Map the io address apprioately */
446 #ifdef CONFIG_HD64465
447 hd64465_port_map(PCIBIOS_MIN_IO, (64 * 1024) - PCIBIOS_MIN_IO + 1,
448 ST40_IO_ADDR + PCIBIOS_MIN_IO, 0);
451 /* ok, do the scan man */
452 pci_root_bus = pci_scan_bus(0, &st40pci_config_ops, NULL);
453 pci_assign_unassigned_resources();
457 subsys_initcall(pcibios_init);
460 * Publish a region of local address space over the PCI bus
463 static void pci_set_rbar_region(unsigned int region, unsigned long localAddr,
464 unsigned long pciOffset, unsigned long regionSize)
471 if (regionSize > (512 * 1024 * 1024))
474 mask = r2p2(regionSize) - 0x10000;
476 /* Diable the region (in case currently in use, should never happen) */
477 ST40PCI_WRITE_INDEXED(RSR, region, 0);
479 /* Start of local address space to publish */
480 ST40PCI_WRITE_INDEXED(RLAR, region, PHYSADDR(localAddr) );
482 /* Start of region in PCI address space as an offset from MBAR0 */
483 ST40PCI_WRITE_INDEXED(RBAR, region, pciOffset);
486 ST40PCI_WRITE_INDEXED(RSR, region, mask | 1);