mpc83xx: Add generic PCI setup code.

Board code can now request the generic setup code rather than having to
copy-and-paste it for themselves.  Boards should be converted to use this
once they're tested with it.

Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/cpu/mpc83xx/Makefile b/cpu/mpc83xx/Makefile
index 4b9dcc8180f240a1c4c9afd49eee2051a1df65ec..bb96f774fe4e3cc795c6aa1bd0742a458fd028a5 100644 (file)
--- a/cpu/mpc83xx/Makefile
+++ b/cpu/mpc83xx/Makefile
@@ -29,7 +29,7 @@ LIB   = $(obj)lib$(CPU).a
 
 START  = start.o
 COBJS  = traps.o cpu.o cpu_init.o speed.o interrupts.o \
-         spd_sdram.o qe_io.o
+         spd_sdram.o qe_io.o pci.o
 
 SRCS   := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS   := $(addprefix $(obj),$(SOBJS) $(COBJS))

diff --git a/cpu/mpc83xx/pci.c b/cpu/mpc83xx/pci.c
new file mode 100644 (file)
index 0000000..2a2b0bd
--- /dev/null
+++ b/cpu/mpc83xx/pci.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) Freescale Semiconductor, Inc. 2007
+ *
+ * Author: Scott Wood <scottwood@freescale.com>,
+ * with some bits from older board-specific PCI initialization.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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>
+#include <pci.h>
+#include <asm/mpc8349_pci.h>
+
+#ifdef CONFIG_83XX_GENERIC_PCI
+#define MAX_BUSES 2
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct pci_controller pci_hose[MAX_BUSES];
+static int pci_num_buses;
+
+static void pci_init_bus(int bus, struct pci_region *reg)
+{
+       volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
+       volatile pot83xx_t *pot = immr->ios.pot;
+       volatile pcictrl83xx_t *pci_ctrl = &immr->pci_ctrl[bus];
+       struct pci_controller *hose = &pci_hose[bus];
+       u32 dev;
+       u16 reg16;
+       int i;
+
+       if (bus == 1)
+               pot += 3;
+
+       /* Setup outbound translation windows */
+       for (i = 0; i < 3; i++, reg++, pot++) {
+               if (reg->size == 0)
+                       break;
+
+               hose->regions[i] = *reg;
+               hose->region_count++;
+
+               pot->potar = reg->bus_start >> 12;
+               pot->pobar = reg->phys_start >> 12;
+               pot->pocmr = ~(reg->size - 1) >> 12;
+
+               if (reg->flags & PCI_REGION_IO)
+                       pot->pocmr |= POCMR_IO;
+#ifdef CONFIG_83XX_PCI_STREAMING
+               else if (reg->flags & PCI_REGION_PREFETCH)
+                       pot->pocmr |= POCMR_SE;
+#endif
+
+               if (bus == 1)
+                       pot->pocmr |= POCMR_DST;
+
+               pot->pocmr |= POCMR_EN;
+       }
+
+       /* Point inbound translation at RAM */
+       pci_ctrl->pitar1 = 0;
+       pci_ctrl->pibar1 = 0;
+       pci_ctrl->piebar1 = 0;
+       pci_ctrl->piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
+                          PIWAR_WTT_SNOOP | (__ilog2(gd->ram_size) - 1);
+
+       i = hose->region_count++;
+       hose->regions[i].bus_start = 0;
+       hose->regions[i].phys_start = 0;
+       hose->regions[i].size = gd->ram_size;
+       hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_MEMORY;
+
+       hose->first_busno = 0;
+       hose->last_busno = 0xff;
+
+       pci_setup_indirect(hose, CFG_IMMR + 0x8300 + bus * 0x80,
+                                CFG_IMMR + 0x8304 + bus * 0x80);
+
+       pci_register_hose(hose);
+
+       /*
+        * Write to Command register
+        */
+       reg16 = 0xff;
+       dev = PCI_BDF(hose->first_busno, 0, 0);
+       pci_hose_read_config_word(hose, dev, PCI_COMMAND, &reg16);
+       reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
+       pci_hose_write_config_word(hose, dev, PCI_COMMAND, reg16);
+
+       /*
+        * Clear non-reserved bits in status register.
+        */
+       pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
+       pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
+       pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
+
+#ifdef CONFIG_PCI_SCAN_SHOW
+       printf("PCI:   Bus Dev VenId DevId Class Int\n");
+#endif
+       /*
+        * Hose scan.
+        */
+       hose->last_busno = pci_hose_scan(hose);
+}
+
+/*
+ * The caller must have already set OCCR, and the PCI_LAW BARs
+ * must have been set to cover all of the requested regions.
+ *
+ * If fewer than three regions are requested, then the region
+ * list is terminated with a region of size 0.
+ */
+void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot)
+{
+       volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
+       int i;
+
+       if (num_buses > MAX_BUSES) {
+               printf("%d PCI buses requsted, %d supported\n",
+                      num_buses, MAX_BUSES);
+
+               num_buses = MAX_BUSES;
+       }
+
+       pci_num_buses = num_buses;
+
+       /*
+        * Release PCI RST Output signal.
+        * Power on to RST high must be at least 100 ms as per PCI spec.
+        * On warm boots only 1 ms is required.
+        */
+       udelay(warmboot ? 1000 : 100000);
+
+       for (i = 0; i < num_buses; i++)
+               immr->pci_ctrl[i].gcr = 1;
+
+       /*
+        * RST high to first config access must be at least 2^25 cycles
+        * as per PCI spec.  This could be cut in half if we know we're
+        * running at 66MHz.  This could be insufficiently long if we're
+        * running the PCI bus at significantly less than 33MHz.
+        */
+       udelay(1020000);
+
+       for (i = 0; i < num_buses; i++)
+               pci_init_bus(i, reg[i]);
+}
+
+#ifdef CONFIG_OF_FLAT_TREE
+void ft_pci_setup(void *blob, bd_t *bd)
+{
+       u32 *p;
+       int len;
+
+       if (pci_num_buses < 1)
+               return;
+
+       p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8500/bus-range", &len);
+       if (p) {
+               p[0] = pci_hose[0].first_busno;
+               p[1] = pci_hose[0].last_busno;
+       }
+
+       if (pci_num_buses < 2)
+               return;
+
+       p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8600/bus-range", &len);
+       if (p) {
+               p[0] = pci_hose[1].first_busno;
+               p[1] = pci_hose[1].last_busno;
+       }
+}
+#endif /* CONFIG_OF_FLAT_TREE */
+
+#endif /* CONFIG_83XX_GENERIC_PCI */

diff --git a/include/mpc83xx.h b/include/mpc83xx.h
index 16b6c62f07ec6856bdc71617ad70d181554a0b8e..60fc214b3e224658274886ead3348bf2c78b6a6d 100644 (file)
--- a/include/mpc83xx.h
+++ b/include/mpc83xx.h
@@ -1269,4 +1269,9 @@
 #define DDRCDR_M_ODR           0x00000002
 #define DDRCDR_Q_DRN           0x00000001
 
+#ifndef __ASSEMBLY__
+struct pci_region;
+void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot);
+#endif
+
 #endif /* __MPC83XX_H__ */