drivers/pci/fsl_pci_init.c

/*
 * Copyright 2007 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * Version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>

/*
 * PCI/PCIE Controller initialization for mpc85xx/mpc86xx soc's
 *
 * Initialize controller and call the common driver/pci pci_hose_scan to
 * scan for bridges and devices.
 *
 * Hose fields which need to be pre-initialized by board specific code:
 *   regions[]
 *   first_busno
 *
 * Fields updated:
 *   last_busno
 */

#include <pci.h>
#include <asm/immap_fsl_pci.h>

void pciauto_prescan_setup_bridge(struct pci_controller *hose,
				pci_dev_t dev, int sub_bus);
void pciauto_postscan_setup_bridge(struct pci_controller *hose,
				pci_dev_t dev, int sub_bus);

void pciauto_config_init(struct pci_controller *hose);
void
fsl_pci_init(struct pci_controller *hose)
{
	u16 temp16;
	u32 temp32;
	int busno = hose->first_busno;
	int enabled;
	u16 ltssm;
	u8 temp8;
	int r;
	int bridge;
	int inbound = 0;
	volatile ccsr_fsl_pci_t *pci = (ccsr_fsl_pci_t *) hose->cfg_addr;
	pci_dev_t dev = PCI_BDF(busno,0,0);

	/* Initialize ATMU registers based on hose regions and flags */
	volatile pot_t *po = &pci->pot[1];	/* skip 0 */
	volatile pit_t *pi = &pci->pit[0];	/* ranges from: 3 to 1 */

#ifdef DEBUG
	int neg_link_w;
#endif

	for (r=0; r<hose->region_count; r++) {
		if (hose->regions[r].flags & PCI_REGION_MEMORY) { /* inbound */
			pi->pitar = (hose->regions[r].bus_start >> 12) & 0x000fffff;
			pi->piwbar = (hose->regions[r].phys_start >> 12) & 0x000fffff;
			pi->piwbear = 0;
			pi->piwar = PIWAR_EN | PIWAR_PF | PIWAR_LOCAL |
				PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP |
				(__ilog2(hose->regions[r].size) - 1);
			pi++;
			inbound = hose->regions[r].size > 0;
		} else { /* Outbound */
			po->powbar = (hose->regions[r].phys_start >> 12) & 0x000fffff;
			po->potar = (hose->regions[r].bus_start >> 12) & 0x000fffff;
			po->potear = 0;
			if (hose->regions[r].flags & PCI_REGION_IO)
				po->powar = POWAR_EN | POWAR_IO_READ | POWAR_IO_WRITE |
					(__ilog2(hose->regions[r].size) - 1);
			else
				po->powar = POWAR_EN | POWAR_MEM_READ | POWAR_MEM_WRITE |
					(__ilog2(hose->regions[r].size) - 1);
			po++;
		}
	}

	pci_register_hose(hose);
	pciauto_config_init(hose);	/* grab pci_{mem,prefetch,io} */
	hose->current_busno = hose->first_busno;

	pci->pedr = 0xffffffff;		/* Clear any errors */
	pci->peer = ~0x20140;		/* Enable All Error Interupts except
					 * - Master abort (pci)
					 * - Master PERR (pci)
					 * - ICCA (PCIe)
					 */
	pci_hose_read_config_dword (hose, dev, PCI_DCR, &temp32);
	temp32 |= 0xf000e;		/* set URR, FER, NFER (but not CER) */
	pci_hose_write_config_dword(hose, dev, PCI_DCR, temp32);

	pci_hose_read_config_byte (hose, dev, PCI_HEADER_TYPE, &temp8);
	bridge = temp8 & PCI_HEADER_TYPE_BRIDGE; /* Bridge, such as pcie */

	if ( bridge ) {

		pci_hose_read_config_word(hose, dev, PCI_LTSSM, &ltssm);
		enabled = ltssm >= PCI_LTSSM_L0;

#ifdef CONFIG_FSL_PCIE_RESET
		if (ltssm == 1) {
			int i;
			debug("....PCIe link error. "
			      "LTSSM=0x%02x.", ltssm);
			pci->pdb_stat |= 0x08000000; /* assert PCIe reset */
			temp32 = pci->pdb_stat;
			udelay(100);
			debug("  Asserting PCIe reset @%x = %x\n",
			      &pci->pdb_stat, pci->pdb_stat);
			pci->pdb_stat &= ~0x08000000; /* clear reset */
			asm("sync;isync");
			for (i=0; i<100 && ltssm < PCI_LTSSM_L0; i++) {
				pci_hose_read_config_word(hose, dev, PCI_LTSSM,
							&ltssm);
				udelay(1000);
				debug("....PCIe link error. "
				      "LTSSM=0x%02x.\n", ltssm);
			}
			enabled = ltssm >= PCI_LTSSM_L0;
		}
#endif

		if (!enabled) {
			debug("....PCIE link error.  Skipping scan."
			      "LTSSM=0x%02x\n", ltssm);
			hose->last_busno = hose->first_busno;
			return;
		}

		pci->pme_msg_det = 0xffffffff;
		pci->pme_msg_int_en = 0xffffffff;
#ifdef DEBUG
		pci_hose_read_config_word(hose, dev, PCI_LSR, &temp16);
		neg_link_w = (temp16 & 0x3f0 ) >> 4;
		printf("...PCIE LTSSM=0x%x, Negotiated link width=%d\n",
		      ltssm, neg_link_w);
#endif
		hose->current_busno++; /* Start scan with secondary */
		pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);

	}

	/* Use generic setup_device to initialize standard pci regs,
	 * but do not allocate any windows since any BAR found (such
	 * as PCSRBAR) is not in this cpu's memory space.
	 */

	pciauto_setup_device(hose, dev, 0, hose->pci_mem,
			     hose->pci_prefetch, hose->pci_io);

	if (inbound) {
		pci_hose_read_config_word(hose, dev, PCI_COMMAND, &temp16);
		pci_hose_write_config_word(hose, dev, PCI_COMMAND,
					   temp16 | PCI_COMMAND_MEMORY);
	}

#ifndef CONFIG_PCI_NOSCAN
	pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &temp8);

	/* Programming Interface (PCI_CLASS_PROG)
	 * 0 == pci host or pcie root-complex,
	 * 1 == pci agent or pcie end-point
	 */
	if (!temp8) {
		printf("               Scanning PCI bus %02x\n",
			hose->current_busno);
		hose->last_busno = pci_hose_scan_bus(hose, hose->current_busno);
	} else {
		debug("               Not scanning PCI bus %02x. PI=%x\n",
			hose->current_busno, temp8);
		hose->last_busno = hose->current_busno;
	}

	if ( bridge ) { /* update limit regs and subordinate busno */
		pciauto_postscan_setup_bridge(hose, dev, hose->last_busno);
	}
#else
	hose->last_busno = hose->current_busno;
#endif

	/* Clear all error indications */

	if (bridge)
		pci->pme_msg_det = 0xffffffff;
	pci->pedr = 0xffffffff;

	pci_hose_read_config_word (hose, dev, PCI_DSR, &temp16);
	if (temp16) {
		pci_hose_write_config_word(hose, dev,
					PCI_DSR, 0xffff);
	}

	pci_hose_read_config_word (hose, dev, PCI_SEC_STATUS, &temp16);
	if (temp16) {
		pci_hose_write_config_word(hose, dev, PCI_SEC_STATUS, 0xffff);
	}
}