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// SPDX-License-Identifier: GPL-2.0-only
/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
* Copyright (C) 2008 Dmitri Vorobiev
*/
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/of_fdt.h>
#include <linux/pci.h>
#include <linux/screen_info.h>
#include <linux/time.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <asm/fw/fw.h>
#include <asm/mips-cps.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/malta.h>
#include <asm/mips-boards/maltaint.h>
#include <asm/dma.h>
#include <asm/prom.h>
#include <asm/traps.h>
#ifdef CONFIG_VT
#include <linux/console.h>
#endif
#define ROCIT_CONFIG_GEN0 0x1f403000
#define ROCIT_CONFIG_GEN0_PCI_IOCU BIT(7)
static struct resource standard_io_resources[] = {
{
.name = "dma1",
.start = 0x00,
.end = 0x1f,
.flags = IORESOURCE_IO | IORESOURCE_BUSY
},
{
.name = "timer",
.start = 0x40,
.end = 0x5f,
.flags = IORESOURCE_IO | IORESOURCE_BUSY
},
{
.name = "keyboard",
.start = 0x60,
.end = 0x6f,
.flags = IORESOURCE_IO | IORESOURCE_BUSY
},
{
.name = "dma page reg",
.start = 0x80,
.end = 0x8f,
.flags = IORESOURCE_IO | IORESOURCE_BUSY
},
{
.name = "dma2",
.start = 0xc0,
.end = 0xdf,
.flags = IORESOURCE_IO | IORESOURCE_BUSY
},
};
const char *get_system_type(void)
{
return "MIPS Malta";
}
#ifdef CONFIG_BLK_DEV_FD
static void __init fd_activate(void)
{
/*
* Activate Floppy Controller in the SMSC FDC37M817 Super I/O
* Controller.
* Done by YAMON 2.00 onwards
*/
/* Entering config state. */
SMSC_WRITE(SMSC_CONFIG_ENTER, SMSC_CONFIG_REG);
/* Activate floppy controller. */
SMSC_WRITE(SMSC_CONFIG_DEVNUM, SMSC_CONFIG_REG);
SMSC_WRITE(SMSC_CONFIG_DEVNUM_FLOPPY, SMSC_DATA_REG);
SMSC_WRITE(SMSC_CONFIG_ACTIVATE, SMSC_CONFIG_REG);
SMSC_WRITE(SMSC_CONFIG_ACTIVATE_ENABLE, SMSC_DATA_REG);
/* Exit config state. */
SMSC_WRITE(SMSC_CONFIG_EXIT, SMSC_CONFIG_REG);
}
#endif
static void __init plat_setup_iocoherency(void)
{
u32 cfg;
if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO) {
if (BONITO_PCICACHECTRL & BONITO_PCICACHECTRL_CPUCOH_PRES) {
BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_CPUCOH_EN;
pr_info("Enabled Bonito CPU coherency\n");
dma_default_coherent = true;
}
if (strstr(fw_getcmdline(), "iobcuncached")) {
BONITO_PCICACHECTRL &= ~BONITO_PCICACHECTRL_IOBCCOH_EN;
BONITO_PCIMEMBASECFG = BONITO_PCIMEMBASECFG &
~(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
pr_info("Disabled Bonito IOBC coherency\n");
} else {
BONITO_PCICACHECTRL |= BONITO_PCICACHECTRL_IOBCCOH_EN;
BONITO_PCIMEMBASECFG |=
(BONITO_PCIMEMBASECFG_MEMBASE0_CACHED |
BONITO_PCIMEMBASECFG_MEMBASE1_CACHED);
pr_info("Enabled Bonito IOBC coherency\n");
}
} else if (mips_cps_numiocu(0) != 0) {
/* Nothing special needs to be done to enable coherency */
pr_info("CMP IOCU detected\n");
cfg = __raw_readl((u32 *)CKSEG1ADDR(ROCIT_CONFIG_GEN0));
if (cfg & ROCIT_CONFIG_GEN0_PCI_IOCU)
dma_default_coherent = true;
else
pr_crit("IOCU OPERATION DISABLED BY SWITCH - DEFAULTING TO SW IO COHERENCY\n");
}
if (dma_default_coherent)
pr_info("Hardware DMA cache coherency enabled\n");
else
pr_info("Software DMA cache coherency enabled\n");
}
static void __init pci_clock_check(void)
{
unsigned int __iomem *jmpr_p =
(unsigned int *) ioremap(MALTA_JMPRS_REG, sizeof(unsigned int));
int jmpr = (__raw_readl(jmpr_p) >> 2) & 0x07;
static const int pciclocks[] __initconst = {
33, 20, 25, 30, 12, 16, 37, 10
};
int pciclock = pciclocks[jmpr];
char *optptr, *argptr = fw_getcmdline();
/*
* If user passed a pci_clock= option, don't tack on another one
*/
optptr = strstr(argptr, "pci_clock=");
if (optptr && (optptr == argptr || optptr[-1] == ' '))
return;
if (pciclock != 33) {
pr_warn("WARNING: PCI clock is %dMHz, setting pci_clock\n",
pciclock);
argptr += strlen(argptr);
sprintf(argptr, " pci_clock=%d", pciclock);
if (pciclock < 20 || pciclock > 66)
pr_warn("WARNING: IDE timing calculations will be "
"incorrect\n");
}
}
#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
static void __init screen_info_setup(void)
{
static struct screen_info si = {
.orig_x = 0,
.orig_y = 25,
.ext_mem_k = 0,
.orig_video_page = 0,
.orig_video_mode = 0,
.orig_video_cols = 80,
.unused2 = 0,
.orig_video_ega_bx = 0,
.unused3 = 0,
.orig_video_lines = 25,
.orig_video_isVGA = VIDEO_TYPE_VGAC,
.orig_video_points = 16
};
vgacon_register_screen(&si);
}
#endif
static void __init bonito_quirks_setup(void)
{
char *argptr;
argptr = fw_getcmdline();
if (strstr(argptr, "debug")) {
BONITO_BONGENCFG |= BONITO_BONGENCFG_DEBUGMODE;
pr_info("Enabled Bonito debug mode\n");
} else
BONITO_BONGENCFG &= ~BONITO_BONGENCFG_DEBUGMODE;
}
void __init *plat_get_fdt(void)
{
return (void *)__dtb_start;
}
void __init plat_mem_setup(void)
{
unsigned int i;
void *fdt = plat_get_fdt();
fdt = malta_dt_shim(fdt);
__dt_setup_arch(fdt);
if (IS_ENABLED(CONFIG_EVA))
/* EVA has already been configured in mach-malta/kernel-init.h */
pr_info("Enhanced Virtual Addressing (EVA) activated\n");
mips_pcibios_init();
/* Request I/O space for devices used on the Malta board. */
for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
request_resource(&ioport_resource, standard_io_resources+i);
/*
* Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge.
*/
enable_dma(4);
if (mips_revision_sconid == MIPS_REVISION_SCON_BONITO)
bonito_quirks_setup();
plat_setup_iocoherency();
pci_clock_check();
#ifdef CONFIG_BLK_DEV_FD
fd_activate();
#endif
#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
screen_info_setup();
#endif
}
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