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linux-sg2042/arch/arm/mach-cns3xxx/core.c

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/*
* Copyright 1999 - 2003 ARM Limited
* Copyright 2000 Deep Blue Solutions Ltd
* Copyright 2008 Cavium Networks
*
* This file 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.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/clockchips.h>
#include <linux/io.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/usb/ehci_pdriver.h>
#include <linux/usb/ohci_pdriver.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/hardware/cache-l2x0.h>
#include "cns3xxx.h"
#include "core.h"
#include "pm.h"
static struct map_desc cns3xxx_io_desc[] __initdata = {
{
.virtual = CNS3XXX_TC11MP_SCU_BASE_VIRT,
.pfn = __phys_to_pfn(CNS3XXX_TC11MP_SCU_BASE),
.length = SZ_8K,
.type = MT_DEVICE,
}, {
.virtual = CNS3XXX_TIMER1_2_3_BASE_VIRT,
.pfn = __phys_to_pfn(CNS3XXX_TIMER1_2_3_BASE),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = CNS3XXX_MISC_BASE_VIRT,
.pfn = __phys_to_pfn(CNS3XXX_MISC_BASE),
.length = SZ_4K,
.type = MT_DEVICE,
}, {
.virtual = CNS3XXX_PM_BASE_VIRT,
.pfn = __phys_to_pfn(CNS3XXX_PM_BASE),
.length = SZ_4K,
.type = MT_DEVICE,
},
};
void __init cns3xxx_map_io(void)
{
iotable_init(cns3xxx_io_desc, ARRAY_SIZE(cns3xxx_io_desc));
}
/* used by entry-macro.S */
void __init cns3xxx_init_irq(void)
{
gic_init(0, 29, IOMEM(CNS3XXX_TC11MP_GIC_DIST_BASE_VIRT),
IOMEM(CNS3XXX_TC11MP_GIC_CPU_BASE_VIRT));
}
void cns3xxx_power_off(void)
{
u32 __iomem *pm_base = IOMEM(CNS3XXX_PM_BASE_VIRT);
u32 clkctrl;
printk(KERN_INFO "powering system down...\n");
clkctrl = readl(pm_base + PM_SYS_CLK_CTRL_OFFSET);
clkctrl &= 0xfffff1ff;
clkctrl |= (0x5 << 9); /* Hibernate */
writel(clkctrl, pm_base + PM_SYS_CLK_CTRL_OFFSET);
}
/*
* Timer
*/
static void __iomem *cns3xxx_tmr1;
static void cns3xxx_timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
unsigned long ctrl = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
int pclk = cns3xxx_cpu_clock() / 8;
int reload;
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
reload = pclk * 20 / (3 * HZ) * 0x25000;
writel(reload, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
ctrl |= (1 << 0) | (1 << 2) | (1 << 9);
break;
case CLOCK_EVT_MODE_ONESHOT:
/* period set, and timer enabled in 'next_event' hook */
ctrl |= (1 << 2) | (1 << 9);
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
default:
ctrl = 0;
}
writel(ctrl, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
}
static int cns3xxx_timer_set_next_event(unsigned long evt,
struct clock_event_device *unused)
{
unsigned long ctrl = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
writel(evt, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
writel(ctrl | (1 << 0), cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
return 0;
}
static struct clock_event_device cns3xxx_tmr1_clockevent = {
.name = "cns3xxx timer1",
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = cns3xxx_timer_set_mode,
.set_next_event = cns3xxx_timer_set_next_event,
.rating = 350,
.cpumask = cpu_all_mask,
};
static void __init cns3xxx_clockevents_init(unsigned int timer_irq)
{
cns3xxx_tmr1_clockevent.irq = timer_irq;
clockevents_config_and_register(&cns3xxx_tmr1_clockevent,
(cns3xxx_cpu_clock() >> 3) * 1000000,
0xf, 0xffffffff);
}
/*
* IRQ handler for the timer
*/
static irqreturn_t cns3xxx_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = &cns3xxx_tmr1_clockevent;
u32 __iomem *stat = cns3xxx_tmr1 + TIMER1_2_INTERRUPT_STATUS_OFFSET;
u32 val;
/* Clear the interrupt */
val = readl(stat);
writel(val & ~(1 << 2), stat);
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct irqaction cns3xxx_timer_irq = {
.name = "timer",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = cns3xxx_timer_interrupt,
};
/*
* Set up the clock source and clock events devices
*/
static void __init __cns3xxx_timer_init(unsigned int timer_irq)
{
u32 val;
u32 irq_mask;
/*
* Initialise to a known state (all timers off)
*/
/* disable timer1 and timer2 */
writel(0, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
/* stop free running timer3 */
writel(0, cns3xxx_tmr1 + TIMER_FREERUN_CONTROL_OFFSET);
/* timer1 */
writel(0x5C800, cns3xxx_tmr1 + TIMER1_COUNTER_OFFSET);
writel(0x5C800, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
writel(0, cns3xxx_tmr1 + TIMER1_MATCH_V1_OFFSET);
writel(0, cns3xxx_tmr1 + TIMER1_MATCH_V2_OFFSET);
/* mask irq, non-mask timer1 overflow */
irq_mask = readl(cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
irq_mask &= ~(1 << 2);
irq_mask |= 0x03;
writel(irq_mask, cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
/* down counter */
val = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
val |= (1 << 9);
writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
/* timer2 */
writel(0, cns3xxx_tmr1 + TIMER2_MATCH_V1_OFFSET);
writel(0, cns3xxx_tmr1 + TIMER2_MATCH_V2_OFFSET);
/* mask irq */
irq_mask = readl(cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
irq_mask |= ((1 << 3) | (1 << 4) | (1 << 5));
writel(irq_mask, cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
/* down counter */
val = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
val |= (1 << 10);
writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
/* Make irqs happen for the system timer */
setup_irq(timer_irq, &cns3xxx_timer_irq);
cns3xxx_clockevents_init(timer_irq);
}
void __init cns3xxx_timer_init(void)
{
cns3xxx_tmr1 = IOMEM(CNS3XXX_TIMER1_2_3_BASE_VIRT);
__cns3xxx_timer_init(IRQ_CNS3XXX_TIMER0);
}
#ifdef CONFIG_CACHE_L2X0
void __init cns3xxx_l2x0_init(void)
{
void __iomem *base = ioremap(CNS3XXX_L2C_BASE, SZ_4K);
u32 val;
if (WARN_ON(!base))
return;
/*
* Tag RAM Control register
*
* bit[10:8] - 1 cycle of write accesses latency
* bit[6:4] - 1 cycle of read accesses latency
* bit[3:0] - 1 cycle of setup latency
*
* 1 cycle of latency for setup, read and write accesses
*/
val = readl(base + L2X0_TAG_LATENCY_CTRL);
val &= 0xfffff888;
writel(val, base + L2X0_TAG_LATENCY_CTRL);
/*
* Data RAM Control register
*
* bit[10:8] - 1 cycles of write accesses latency
* bit[6:4] - 1 cycles of read accesses latency
* bit[3:0] - 1 cycle of setup latency
*
* 1 cycle of latency for setup, read and write accesses
*/
val = readl(base + L2X0_DATA_LATENCY_CTRL);
val &= 0xfffff888;
writel(val, base + L2X0_DATA_LATENCY_CTRL);
/* 32 KiB, 8-way, parity disable */
l2x0_init(base, 0x00540000, 0xfe000fff);
}
#endif /* CONFIG_CACHE_L2X0 */
static int csn3xxx_usb_power_on(struct platform_device *pdev)
{
/*
* EHCI and OHCI share the same clock and power,
* resetting twice would cause the 1st controller been reset.
* Therefore only do power up at the first up device, and
* power down at the last down device.
*
* Set USB AHB INCR length to 16
*/
if (atomic_inc_return(&usb_pwr_ref) == 1) {
cns3xxx_pwr_power_up(1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_PLL_USB);
cns3xxx_pwr_clk_en(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
cns3xxx_pwr_soft_rst(1 << PM_SOFT_RST_REG_OFFST_USB_HOST);
__raw_writel((__raw_readl(MISC_CHIP_CONFIG_REG) | (0X2 << 24)),
MISC_CHIP_CONFIG_REG);
}
return 0;
}
static void csn3xxx_usb_power_off(struct platform_device *pdev)
{
/*
* EHCI and OHCI share the same clock and power,
* resetting twice would cause the 1st controller been reset.
* Therefore only do power up at the first up device, and
* power down at the last down device.
*/
if (atomic_dec_return(&usb_pwr_ref) == 0)
cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
}
static struct usb_ehci_pdata cns3xxx_usb_ehci_pdata = {
.power_on = csn3xxx_usb_power_on,
.power_off = csn3xxx_usb_power_off,
};
static struct usb_ohci_pdata cns3xxx_usb_ohci_pdata = {
.num_ports = 1,
.power_on = csn3xxx_usb_power_on,
.power_off = csn3xxx_usb_power_off,
};
static struct of_dev_auxdata cns3xxx_auxdata[] __initconst = {
{ "intel,usb-ehci", CNS3XXX_USB_BASE, "ehci-platform", &cns3xxx_usb_ehci_pdata },
{ "intel,usb-ohci", CNS3XXX_USB_OHCI_BASE, "ohci-platform", &cns3xxx_usb_ohci_pdata },
{ "cavium,cns3420-ahci", CNS3XXX_SATA2_BASE, "ahci", NULL },
{ "cavium,cns3420-sdhci", CNS3XXX_SDIO_BASE, "ahci", NULL },
{},
};
static void __init cns3xxx_init(void)
{
struct device_node *dn;
cns3xxx_l2x0_init();
dn = of_find_compatible_node(NULL, NULL, "cavium,cns3420-ahci");
if (of_device_is_available(dn)) {
u32 tmp;
tmp = __raw_readl(MISC_SATA_POWER_MODE);
tmp |= 0x1 << 16; /* Disable SATA PHY 0 from SLUMBER Mode */
tmp |= 0x1 << 17; /* Disable SATA PHY 1 from SLUMBER Mode */
__raw_writel(tmp, MISC_SATA_POWER_MODE);
/* Enable SATA PHY */
cns3xxx_pwr_power_up(0x1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_SATA_PHY0);
cns3xxx_pwr_power_up(0x1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_SATA_PHY1);
/* Enable SATA Clock */
cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_SATA);
/* De-Asscer SATA Reset */
cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SATA));
}
dn = of_find_compatible_node(NULL, NULL, "cavium,cns3420-sdhci");
if (of_device_is_available(dn)) {
u32 __iomem *gpioa = IOMEM(CNS3XXX_MISC_BASE_VIRT + 0x0014);
u32 gpioa_pins = __raw_readl(gpioa);
/* MMC/SD pins share with GPIOA */
gpioa_pins |= 0x1fff0004;
__raw_writel(gpioa_pins, gpioa);
cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SDIO));
cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SDIO));
}
pm_power_off = cns3xxx_power_off;
of_platform_populate(NULL, of_default_bus_match_table,
cns3xxx_auxdata, NULL);
}
static const char *cns3xxx_dt_compat[] __initdata = {
"cavium,cns3410",
"cavium,cns3420",
NULL,
};
DT_MACHINE_START(CNS3XXX_DT, "Cavium Networks CNS3xxx")
.dt_compat = cns3xxx_dt_compat,
.nr_irqs = NR_IRQS_CNS3XXX,
.map_io = cns3xxx_map_io,
.init_irq = cns3xxx_init_irq,
.init_time = cns3xxx_timer_init,
.init_machine = cns3xxx_init,
.restart = cns3xxx_restart,
MACHINE_END
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