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>

DECLARE_GLOBAL_DATA_PTR;

/*
 * 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/fsl_pci.h>

/* Freescale-specific PCI config registers */
#define FSL_PCI_PBFR		0x44
#define FSL_PCIE_CAP_ID		0x4c
#define FSL_PCIE_CFG_RDY	0x4b0

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);

#ifndef CONFIG_SYS_PCI_MEMORY_BUS
#define CONFIG_SYS_PCI_MEMORY_BUS 0
#endif

#ifndef CONFIG_SYS_PCI_MEMORY_PHYS
#define CONFIG_SYS_PCI_MEMORY_PHYS 0
#endif

#if defined(CONFIG_SYS_PCI_64BIT) && !defined(CONFIG_SYS_PCI64_MEMORY_BUS)
#define CONFIG_SYS_PCI64_MEMORY_BUS (64ull*1024*1024*1024)
#endif

static int fsl_pci_setup_inbound_windows(struct pci_region *r)
{
	struct pci_region *rgn_base = r;
	u64 sz = min((u64)gd->ram_size, (1ull << 32) - 1);

	phys_addr_t phys_start = CONFIG_SYS_PCI_MEMORY_PHYS;
	pci_addr_t bus_start = CONFIG_SYS_PCI_MEMORY_BUS;
	pci_size_t pci_sz = 1ull << __ilog2_u64(sz);

	debug ("R0 bus_start: %llx phys_start: %llx size: %llx\n",
		(u64)bus_start, (u64)phys_start, (u64)pci_sz);
	pci_set_region(r++, bus_start, phys_start, pci_sz,
			PCI_REGION_MEM | PCI_REGION_SYS_MEMORY |
			PCI_REGION_PREFETCH);

	sz -= pci_sz;
	bus_start += pci_sz;
	phys_start += pci_sz;

	pci_sz = 1ull << __ilog2_u64(sz);
	if (sz) {
		debug ("R1 bus_start: %llx phys_start: %llx size: %llx\n",
			(u64)bus_start, (u64)phys_start, (u64)pci_sz);
		pci_set_region(r++, bus_start, phys_start, pci_sz,
				PCI_REGION_MEM | PCI_REGION_SYS_MEMORY |
				PCI_REGION_PREFETCH);
		sz -= pci_sz;
		bus_start += pci_sz;
		phys_start += pci_sz;
	}

#if defined(CONFIG_PHYS_64BIT) && defined(CONFIG_SYS_PCI_64BIT)
	/*
	 * On 64-bit capable systems, set up a mapping for all of DRAM
	 * in high pci address space.
	 */
	pci_sz = 1ull << __ilog2_u64(gd->ram_size);
	/* round up to the next largest power of two */
	if (gd->ram_size > pci_sz)
		pci_sz = 1ull << (__ilog2_u64(gd->ram_size) + 1);
	debug ("R64 bus_start: %llx phys_start: %llx size: %llx\n",
		(u64)CONFIG_SYS_PCI64_MEMORY_BUS,
		(u64)CONFIG_SYS_PCI_MEMORY_PHYS,
		(u64)pci_sz);
	pci_set_region(r++,
			CONFIG_SYS_PCI64_MEMORY_BUS,
			CONFIG_SYS_PCI_MEMORY_PHYS,
			pci_sz,
			PCI_REGION_MEM | PCI_REGION_SYS_MEMORY |
			PCI_REGION_PREFETCH);
#else
	pci_sz = 1ull << __ilog2_u64(sz);
	if (sz) {
		debug ("R2 bus_start: %llx phys_start: %llx size: %llx\n",
			(u64)bus_start, (u64)phys_start, (u64)pci_sz);
		pci_set_region(r++, bus_start, phys_start, pci_sz,
				PCI_REGION_MEM | PCI_REGION_SYS_MEMORY |
				PCI_REGION_PREFETCH);
		sz -= pci_sz;
		bus_start += pci_sz;
		phys_start += pci_sz;
	}
#endif

#ifdef CONFIG_PHYS_64BIT
	if (sz && (((u64)gd->ram_size) < (1ull << 32)))
		printf("Was not able to map all of memory via "
			"inbound windows -- %lld remaining\n", sz);
#endif

	return r - rgn_base;
}

void fsl_pci_init(struct pci_controller *hose, u32 cfg_addr, u32 cfg_data)
{
	u16 temp16;
	u32 temp32;
	int enabled, r, inbound = 0;
	u16 ltssm;
	u8 temp8, pcie_cap;
	volatile ccsr_fsl_pci_t *pci = (ccsr_fsl_pci_t *)cfg_addr;
	struct pci_region *reg = hose->regions + hose->region_count;
	pci_dev_t dev = PCI_BDF(hose->first_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

	pci_setup_indirect(hose, cfg_addr, cfg_data);

	/* inbound */
	reg += fsl_pci_setup_inbound_windows(reg);

	hose->region_count = reg - hose->regions;

	for (r=0; r<hose->region_count; r++) {
		u32 sz = (__ilog2_u64((u64)hose->regions[r].size) - 1);
		if (hose->regions[r].flags & PCI_REGION_SYS_MEMORY) { /* inbound */
			u32 flag = PIWAR_EN | PIWAR_LOCAL |
					PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP;
			pi->pitar = (hose->regions[r].phys_start >> 12);
			pi->piwbar = (hose->regions[r].bus_start >> 12);
#ifdef CONFIG_SYS_PCI_64BIT
			pi->piwbear = (hose->regions[r].bus_start >> 44);
#else
			pi->piwbear = 0;
#endif
			if (hose->regions[r].flags & PCI_REGION_PREFETCH)
				flag |= PIWAR_PF;
			pi->piwar = flag | sz;
			pi++;
			inbound = hose->regions[r].size > 0;
		} else { /* Outbound */
			po->powbar = (hose->regions[r].phys_start >> 12);
			po->potar = (hose->regions[r].bus_start >> 12);
#ifdef CONFIG_SYS_PCI_64BIT
			po->potear = (hose->regions[r].bus_start >> 44);
#else
			po->potear = 0;
#endif
			if (hose->regions[r].flags & PCI_REGION_IO)
				po->powar = POWAR_EN | sz |
					POWAR_IO_READ | POWAR_IO_WRITE;
			else
				po->powar = POWAR_EN | sz |
					POWAR_MEM_READ | POWAR_MEM_WRITE;
			po++;
		}
	}

	/* see if we are a PCIe or PCI controller */
	pci_hose_read_config_byte(hose, dev, FSL_PCIE_CAP_ID, &pcie_cap);

	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);

	if (pcie_cap == PCI_CAP_ID_EXP) {
		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 we are PCIe - update limit regs and subordinate busno
	 * for the virtual P2P bridge
	 */
	if (pcie_cap == PCI_CAP_ID_EXP) {
		pciauto_postscan_setup_bridge(hose, dev, hose->last_busno);
	}
#else
	hose->last_busno = hose->current_busno;
#endif

	/* Clear all error indications */
	if (pcie_cap == PCI_CAP_ID_EXP)
		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);
	}
}

/* Enable inbound PCI config cycles for agent/endpoint interface */
void fsl_pci_config_unlock(struct pci_controller *hose)
{
	pci_dev_t dev = PCI_BDF(hose->first_busno,0,0);
	u8 agent;
	u8 pcie_cap;
	u16 pbfr;

	pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &agent);
	if (!agent)
		return;

	pci_hose_read_config_byte(hose, dev, FSL_PCIE_CAP_ID, &pcie_cap);
	if (pcie_cap != 0x0) {
		/* PCIe - set CFG_READY bit of Configuration Ready Register */
		pci_hose_write_config_byte(hose, dev, FSL_PCIE_CFG_RDY, 0x1);
	} else {
		/* PCI - clear ACL bit of PBFR */
		pci_hose_read_config_word(hose, dev, FSL_PCI_PBFR, &pbfr);
		pbfr &= ~0x20;
		pci_hose_write_config_word(hose, dev, FSL_PCI_PBFR, pbfr);
	}
}

#ifdef CONFIG_OF_BOARD_SETUP
#include <libfdt.h>
#include <fdt_support.h>

void ft_fsl_pci_setup(void *blob, const char *pci_alias,
			struct pci_controller *hose)
{
	int off = fdt_path_offset(blob, pci_alias);

	if (off >= 0) {
		u32 bus_range[2];

		bus_range[0] = 0;
		bus_range[1] = hose->last_busno - hose->first_busno;
		fdt_setprop(blob, off, "bus-range", &bus_range[0], 2*4);
		fdt_pci_dma_ranges(blob, off, hose);
	}
}
#endif