Moved SC520 Files (fix commit 407976185e0dda2c90e89027121a1071b9c77bfb)

Fixes commit 407976185e0dda2c90e89027121a1071b9c77bfb

Signed-off-by: Graeme Russ <graeme.russ at gmail.com>

1 files changed, 516 insertions, 0 deletions

diff --git a/cpu/i386/sc520/sc520.c b/cpu/i386/sc520/sc520.c
new file mode 100644
index 0000000..b958f8d
--- /dev/null
+++ b/cpu/i386/sc520/sc520.c
@@ -0,0 +1,516 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * 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
+ */
+
+/* stuff specific for the sc520,
+ * but idependent of implementation */
+
+#include <config.h>
+#include <common.h>
+#include <config.h>
+#include <pci.h>
+#ifdef CONFIG_SC520_SSI
+#include <asm/ic/ssi.h>
+#endif
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/ic/sc520.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * utility functions for boards based on the AMD sc520
+ *
+ * void write_mmcr_byte(u16 mmcr, u8 data)
+ * void write_mmcr_word(u16 mmcr, u16 data)
+ * void write_mmcr_long(u16 mmcr, u32 data)
+ *
+ * u8   read_mmcr_byte(u16 mmcr)
+ * u16  read_mmcr_word(u16 mmcr)
+ * u32  read_mmcr_long(u16 mmcr)
+ *
+ * void init_sc520(void)
+ * unsigned long init_sc520_dram(void)
+ * void pci_sc520_init(struct pci_controller *hose)
+ *
+ * void reset_timer(void)
+ * ulong get_timer(ulong base)
+ * void set_timer(ulong t)
+ * void udelay(unsigned long usec)
+ *
+ */
+
+static u32 mmcr_base= 0xfffef000;
+
+void write_mmcr_byte(u16 mmcr, u8 data)
+{
+	writeb(data, mmcr+mmcr_base);
+}
+
+void write_mmcr_word(u16 mmcr, u16 data)
+{
+	writew(data, mmcr+mmcr_base);
+}
+
+void write_mmcr_long(u16 mmcr, u32 data)
+{
+	writel(data, mmcr+mmcr_base);
+}
+
+u8 read_mmcr_byte(u16 mmcr)
+{
+	return readb(mmcr+mmcr_base);
+}
+
+u16 read_mmcr_word(u16 mmcr)
+{
+	return readw(mmcr+mmcr_base);
+}
+
+u32 read_mmcr_long(u16 mmcr)
+{
+	return readl(mmcr+mmcr_base);
+}
+
+
+void init_sc520(void)
+{
+	/* Set the UARTxCTL register at it's slower,
+	 * baud clock giving us a 1.8432 MHz reference
+	 */
+	write_mmcr_byte(SC520_UART1CTL, 7);
+	write_mmcr_byte(SC520_UART2CTL, 7);
+
+	/* first set the timer pin mapping */
+	write_mmcr_byte(SC520_CLKSEL, 0x72);	/* no clock frequency selected, use 1.1892MHz */
+
+	/* enable PCI bus arbitrer */
+	write_mmcr_byte(SC520_SYSARBCTL,0x02);  /* enable concurrent mode */
+
+	write_mmcr_word(SC520_SYSARBMENB,0x1f); /* enable external grants */
+	write_mmcr_word(SC520_HBCTL,0x04);      /* enable posted-writes */
+
+
+	if (CONFIG_SYS_SC520_HIGH_SPEED) {
+		write_mmcr_byte(SC520_CPUCTL, 0x2);	/* set it to 133 MHz and write back */
+		gd->cpu_clk = 133000000;
+		printf("## CPU Speed set to 133MHz\n");
+	} else {
+		write_mmcr_byte(SC520_CPUCTL, 1);	/* set CPU to 100 MHz and write back cache */
+		printf("## CPU Speed set to 100MHz\n");
+		gd->cpu_clk = 100000000;
+	}
+
+
+	/* wait at least one millisecond */
+	asm("movl	$0x2000,%%ecx\n"
+	    "wait_loop:	pushl %%ecx\n"
+	    "popl	%%ecx\n"
+	    "loop wait_loop\n": : : "ecx");
+
+	/* turn on the SDRAM write buffer */
+	write_mmcr_byte(SC520_DBCTL, 0x11);
+
+	/* turn on the cache and disable write through */
+	asm("movl	%%cr0, %%eax\n"
+	    "andl	$0x9fffffff, %%eax\n"
+	    "movl	%%eax, %%cr0\n"  : : : "eax");
+}
+
+unsigned long init_sc520_dram(void)
+{
+	bd_t *bd = gd->bd;
+
+	u32 dram_present=0;
+	u32 dram_ctrl;
+#ifdef CONFIG_SYS_SDRAM_DRCTMCTL
+	/* these memory control registers are set up in the assember part,
+	 * in sc520_asm.S, during 'mem_init'.  If we muck with them here,
+	 * after we are running a stack in RAM, we have troubles.  Besides,
+	 * these refresh and delay values are better ? simply specified
+	 * outright in the include/configs/{cfg} file since the HW designer
+	 * simply dictates it.
+	 */
+#else
+	int val;
+
+	int cas_precharge_delay = CONFIG_SYS_SDRAM_PRECHARGE_DELAY;
+	int refresh_rate        = CONFIG_SYS_SDRAM_REFRESH_RATE;
+	int ras_cas_delay       = CONFIG_SYS_SDRAM_RAS_CAS_DELAY;
+
+	/* set SDRAM speed here */
+
+	refresh_rate/=78;
+	if (refresh_rate<=1) {
+		val = 0;  /* 7.8us */
+	} else if (refresh_rate==2) {
+		val = 1;  /* 15.6us */
+	} else if (refresh_rate==3 || refresh_rate==4) {
+		val = 2;  /* 31.2us */
+	} else {
+		val = 3;  /* 62.4us */
+	}
+
+	write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) | (val<<4));
+
+	val = read_mmcr_byte(SC520_DRCTMCTL);
+	val &= 0xf0;
+
+	if (cas_precharge_delay==3) {
+		val |= 0x04;   /* 3T */
+	} else if (cas_precharge_delay==4) {
+		val |= 0x08;   /* 4T */
+	} else if (cas_precharge_delay>4) {
+		val |= 0x0c;
+	}
+
+	if (ras_cas_delay > 3) {
+		val |= 2;
+	} else {
+		val |= 1;
+	}
+	write_mmcr_byte(SC520_DRCTMCTL, val);
+#endif
+
+	/* We read-back the configuration of the dram
+	 * controller that the assembly code wrote */
+	dram_ctrl = read_mmcr_long(SC520_DRCBENDADR);
+
+	bd->bi_dram[0].start = 0;
+	if (dram_ctrl & 0x80) {
+		/* bank 0 enabled */
+		dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
+		bd->bi_dram[0].size = bd->bi_dram[1].start;
+
+	} else {
+		bd->bi_dram[0].size = 0;
+		bd->bi_dram[1].start = bd->bi_dram[0].start;
+	}
+
+	if (dram_ctrl & 0x8000) {
+		/* bank 1 enabled */
+		dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
+		bd->bi_dram[1].size = bd->bi_dram[2].start -  bd->bi_dram[1].start;
+	} else {
+		bd->bi_dram[1].size = 0;
+		bd->bi_dram[2].start = bd->bi_dram[1].start;
+	}
+
+	if (dram_ctrl & 0x800000) {
+		/* bank 2 enabled */
+		dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
+		bd->bi_dram[2].size = bd->bi_dram[3].start -  bd->bi_dram[2].start;
+	} else {
+		bd->bi_dram[2].size = 0;
+		bd->bi_dram[3].start = bd->bi_dram[2].start;
+	}
+
+	if (dram_ctrl & 0x80000000) {
+		/* bank 3 enabled */
+		dram_present  = (dram_ctrl & 0x7f000000) >> 2;
+		bd->bi_dram[3].size = dram_present -  bd->bi_dram[3].start;
+	} else {
+		bd->bi_dram[3].size = 0;
+	}
+
+
+#if 0
+	printf("Configured %d bytes of dram\n", dram_present);
+#endif
+	gd->ram_size = dram_present;
+
+	return dram_present;
+}
+
+
+#ifdef CONFIG_PCI
+
+
+static struct {
+	u8 priority;
+	u16 level_reg;
+	u8 level_bit;
+} sc520_irq[] = {
+	{ SC520_IRQ0,  SC520_MPICMODE,  0x01 },
+	{ SC520_IRQ1,  SC520_MPICMODE,  0x02 },
+	{ SC520_IRQ2,  SC520_SL1PICMODE, 0x02 },
+	{ SC520_IRQ3,  SC520_MPICMODE,  0x08 },
+	{ SC520_IRQ4,  SC520_MPICMODE,  0x10 },
+	{ SC520_IRQ5,  SC520_MPICMODE,  0x20 },
+	{ SC520_IRQ6,  SC520_MPICMODE,  0x40 },
+	{ SC520_IRQ7,  SC520_MPICMODE,  0x80 },
+
+	{ SC520_IRQ8,  SC520_SL1PICMODE, 0x01 },
+	{ SC520_IRQ9,  SC520_SL1PICMODE, 0x02 },
+	{ SC520_IRQ10, SC520_SL1PICMODE, 0x04 },
+	{ SC520_IRQ11, SC520_SL1PICMODE, 0x08 },
+	{ SC520_IRQ12, SC520_SL1PICMODE, 0x10 },
+	{ SC520_IRQ13, SC520_SL1PICMODE, 0x20 },
+	{ SC520_IRQ14, SC520_SL1PICMODE, 0x40 },
+	{ SC520_IRQ15, SC520_SL1PICMODE, 0x80 }
+};
+
+
+/* The interrupt used for PCI INTA-INTD  */
+int sc520_pci_ints[15] = {
+	-1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1
+};
+
+/* utility function to configure a pci interrupt */
+int pci_sc520_set_irq(int pci_pin, int irq)
+{
+	int i;
+
+# if 1
+	printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq);
+#endif
+	if (irq < 0 || irq > 15) {
+		return -1; /* illegal irq */
+	}
+
+	if (pci_pin < 0 || pci_pin > 15) {
+		return -1; /* illegal pci int pin */
+	}
+
+	/* first disable any non-pci interrupt source that use
+	 * this level */
+	for (i=SC520_GPTMR0MAP;i<=SC520_GP10IMAP;i++) {
+		if (i>=SC520_PCIINTAMAP&&i<=SC520_PCIINTDMAP) {
+			continue;
+		}
+		if (read_mmcr_byte(i) == sc520_irq[irq].priority) {
+			write_mmcr_byte(i, SC520_IRQ_DISABLED);
+		}
+	}
+
+	/* Set the trigger to level */
+	write_mmcr_byte(sc520_irq[irq].level_reg,
+			read_mmcr_byte(sc520_irq[irq].level_reg) | sc520_irq[irq].level_bit);
+
+
+	if (pci_pin < 4) {
+		/* PCI INTA-INTD */
+		/* route the interrupt */
+		write_mmcr_byte(SC520_PCIINTAMAP + pci_pin, sc520_irq[irq].priority);
+
+
+	} else {
+		/* GPIRQ0-GPIRQ10 used for additional PCI INTS */
+		write_mmcr_byte(SC520_GP0IMAP + pci_pin - 4, sc520_irq[irq].priority);
+
+		/* also set the polarity in this case */
+		write_mmcr_word(SC520_INTPINPOL,
+				read_mmcr_word(SC520_INTPINPOL) | (1 << (pci_pin-4)));
+
+	}
+
+	/* register the pin */
+	sc520_pci_ints[pci_pin] = irq;
+
+
+	return 0; /* OK */
+}
+
+void pci_sc520_init(struct pci_controller *hose)
+{
+	hose->first_busno = 0;
+	hose->last_busno = 0xff;
+
+	/* System memory space */
+	pci_set_region(hose->regions + 0,
+		       SC520_PCI_MEMORY_BUS,
+		       SC520_PCI_MEMORY_PHYS,
+		       SC520_PCI_MEMORY_SIZE,
+		       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	/* PCI memory space */
+	pci_set_region(hose->regions + 1,
+		       SC520_PCI_MEM_BUS,
+		       SC520_PCI_MEM_PHYS,
+		       SC520_PCI_MEM_SIZE,
+		       PCI_REGION_MEM);
+
+	/* ISA/PCI memory space */
+	pci_set_region(hose->regions + 2,
+		       SC520_ISA_MEM_BUS,
+		       SC520_ISA_MEM_PHYS,
+		       SC520_ISA_MEM_SIZE,
+		       PCI_REGION_MEM);
+
+	/* PCI I/O space */
+	pci_set_region(hose->regions + 3,
+		       SC520_PCI_IO_BUS,
+		       SC520_PCI_IO_PHYS,
+		       SC520_PCI_IO_SIZE,
+		       PCI_REGION_IO);
+
+	/* ISA/PCI I/O space */
+	pci_set_region(hose->regions + 4,
+		       SC520_ISA_IO_BUS,
+		       SC520_ISA_IO_PHYS,
+		       SC520_ISA_IO_SIZE,
+		       PCI_REGION_IO);
+
+	hose->region_count = 5;
+
+	pci_setup_type1(hose,
+			SC520_REG_ADDR,
+			SC520_REG_DATA);
+
+	pci_register_hose(hose);
+
+	hose->last_busno = pci_hose_scan(hose);
+
+	/* enable target memory acceses on host brige */
+	pci_write_config_word(0, PCI_COMMAND,
+			      PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+}
+
+
+#endif
+
+#ifdef CONFIG_SYS_TIMER_SC520
+
+
+void reset_timer(void)
+{
+	write_mmcr_word(SC520_GPTMR0CNT, 0);
+	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
+
+}
+
+ulong get_timer(ulong base)
+{
+	/* fixme: 30 or 33 */
+	return	read_mmcr_word(SC520_GPTMR0CNT) / 33;
+}
+
+void set_timer(ulong t)
+{
+	/* FixMe: use two cascade coupled timers */
+	write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
+	write_mmcr_word(SC520_GPTMR0CNT, t*33);
+	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
+}
+
+
+void udelay(unsigned long usec)
+{
+	int m=0;
+	long u;
+
+	read_mmcr_word(SC520_SWTMRMILLI);
+	read_mmcr_word(SC520_SWTMRMICRO);
+
+#if 0
+	/* do not enable this line, udelay is used in the serial driver -> recursion */
+	printf("udelay: %ld m.u %d.%d  tm.tu %d.%d\n", usec, m, u, tm, tu);
+#endif
+	while (1) {
+
+		m += read_mmcr_word(SC520_SWTMRMILLI);
+		u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);
+
+		if (usec <= u) {
+			break;
+		}
+	}
+}
+
+#endif
+
+int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
+{
+	u8 temp=0;
+
+	if (freq >= 8192) {
+		temp |= CTL_CLK_SEL_4;
+	} else if (freq >= 4096) {
+		temp |= CTL_CLK_SEL_8;
+	} else if (freq >= 2048) {
+		temp |= CTL_CLK_SEL_16;
+	} else if (freq >= 1024) {
+		temp |= CTL_CLK_SEL_32;
+	} else if (freq >= 512) {
+		temp |= CTL_CLK_SEL_64;
+	} else if (freq >= 256) {
+		temp |= CTL_CLK_SEL_128;
+	} else if (freq >= 128) {
+		temp |= CTL_CLK_SEL_256;
+	} else {
+		temp |= CTL_CLK_SEL_512;
+	}
+
+	if (!lsb_first) {
+		temp |= MSBF_ENB;
+	}
+
+	if (inv_clock) {
+		temp |= CLK_INV_ENB;
+	}
+
+	if (inv_phase) {
+		temp |= PHS_INV_ENB;
+	}
+
+	write_mmcr_byte(SC520_SSICTL, temp);
+
+	return 0;
+}
+
+u8 ssi_txrx_byte(u8 data)
+{
+	write_mmcr_byte(SC520_SSIXMIT, data);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	return read_mmcr_byte(SC520_SSIRCV);
+}
+
+
+void ssi_tx_byte(u8 data)
+{
+	write_mmcr_byte(SC520_SSIXMIT, data);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT);
+}
+
+u8 ssi_rx_byte(void)
+{
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	return read_mmcr_byte(SC520_SSIRCV);
+}
+
+#ifdef CONFIG_SYS_RESET_SC520
+void reset_cpu(ulong addr)
+{
+	printf("Resetting using SC520 MMCR\n");
+	/* Write a '1' to the SYS_RST of the RESCFG MMCR */
+	write_mmcr_word(SC520_RESCFG, 0x0001);
+
+	/* NOTREACHED */
+}
+#endif