MPC8349EMDS: Add PCI Agent (PCISLAVE) support

Add the ability for the MPC8349EMDS to run in PCI Agent mode, acting as a
PCI card rather than a host computer.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

board/freescale/mpc8349emds/mpc8349emds.c

@@ -165,6 +165,15 @@ int fixed_sdram(void)
 
 int checkboard (void)
 {
+	/*
+	 * Warning: do not read the BCSR registers here
+	 *
+	 * There is a timing bug in the 8349E and 8349EA BCSR code
+	 * version 1.2 (read from BCSR 11) that will cause the CFI
+	 * flash initialization code to overwrite BCSR 0, disabling
+	 * the serial ports and gigabit ethernet
+	 */
+
 	puts("Board: Freescale MPC8349EMDS\n");
 	return 0;
 }

board/freescale/mpc8349emds/pci.c

@@ -75,6 +75,7 @@ static struct pci_region pci2_regions[] = {
 };
 #endif
 
+#ifndef CONFIG_PCISLAVE
 void pib_init(void)
 {
 	u8 val8, orig_i2c_bus;
@@ -166,4 +167,52 @@ void pci_init_board(void)
 #endif
 }
 
+#else
+void pci_init_board(void)
+{
+	volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
+	volatile clk83xx_t *clk = (volatile clk83xx_t *)&immr->clk;
+	volatile law83xx_t *pci_law = immr->sysconf.pcilaw;
+	volatile pcictrl83xx_t *pci_ctrl = &immr->pci_ctrl[0];
+	struct pci_region *reg[] = { pci1_regions };
+
+	/* Enable all 8 PCI_CLK_OUTPUTS */
+	clk->occr = 0xff000000;
+	udelay(2000);
+
+	/* Configure PCI Local Access Windows */
+	pci_law[0].bar = CFG_PCI1_MEM_PHYS & LAWBAR_BAR;
+	pci_law[0].ar = LAWAR_EN | LAWAR_SIZE_1G;
+
+	pci_law[1].bar = CFG_PCI1_IO_PHYS & LAWBAR_BAR;
+	pci_law[1].ar = LAWAR_EN | LAWAR_SIZE_4M;
+
+	udelay(2000);
+
+	mpc83xx_pci_init(1, reg, 0);
+
+	/* Configure PCI Inbound Translation Windows (3 1MB windows) */
+	pci_ctrl->pitar0 = 0x0;
+	pci_ctrl->pibar0 = 0x0;
+	pci_ctrl->piwar0 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
+			   PIWAR_WTT_SNOOP | PIWAR_IWS_1M;
+
+	pci_ctrl->pitar1  = 0x0;
+	pci_ctrl->pibar1  = 0x0;
+	pci_ctrl->piebar1 = 0x0;
+	pci_ctrl->piwar1  = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
+			    PIWAR_WTT_SNOOP | PIWAR_IWS_1M;
+
+	pci_ctrl->pitar2  = 0x0;
+	pci_ctrl->pibar2  = 0x0;
+	pci_ctrl->piebar2 = 0x0;
+	pci_ctrl->piwar2  = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
+			    PIWAR_WTT_SNOOP | PIWAR_IWS_1M;
+
+	/* Unlock the configuration bit */
+	mpc83xx_pcislave_unlock(0);
+	printf("PCI:   Agent mode enabled\n");
+}
+#endif /* CONFIG_PCISLAVE */
+
 #endif /* CONFIG_PCI */

include/configs/MPC8349EMDS.h

@@ -48,6 +48,11 @@
 #define CONFIG_83XX_CLKIN	33000000	/* in Hz */
 #endif
 
+#ifdef CONFIG_PCISLAVE
+#define CONFIG_PCI
+#define CONFIG_83XX_PCICLK	66666666	/* in Hz */
+#endif /* CONFIG_PCISLAVE */
+
 #ifndef CONFIG_SYS_CLK_FREQ
 #ifdef PCI_66M
 #define CONFIG_SYS_CLK_FREQ	66000000
@@ -575,6 +580,20 @@
 	HRCWL_CORE_TO_CSB_1X1)
 #endif
 
+#ifdef CONFIG_PCISLAVE
+#define CFG_HRCW_HIGH (\
+	HRCWH_PCI_AGENT |\
+	HRCWH_64_BIT_PCI |\
+	HRCWH_PCI1_ARBITER_DISABLE |\
+	HRCWH_PCI2_ARBITER_DISABLE |\
+	HRCWH_CORE_ENABLE |\
+	HRCWH_FROM_0X00000100 |\
+	HRCWH_BOOTSEQ_DISABLE |\
+	HRCWH_SW_WATCHDOG_DISABLE |\
+	HRCWH_ROM_LOC_LOCAL_16BIT |\
+	HRCWH_TSEC1M_IN_GMII |\
+	HRCWH_TSEC2M_IN_GMII )
+#else
 #if defined(PCI_64BIT)
 #define CFG_HRCW_HIGH (\
 	HRCWH_PCI_HOST |\
@@ -601,7 +620,8 @@
 	HRCWH_ROM_LOC_LOCAL_16BIT |\
 	HRCWH_TSEC1M_IN_GMII |\
 	HRCWH_TSEC2M_IN_GMII )
-#endif
+#endif /* PCI_64BIT */
+#endif /* CONFIG_PCISLAVE */
 
 /*
  * System performance