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kernel-ark/arch/arm/mach-versatile/core.c

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/*
* linux/arch/arm/mach-versatile/core.c
*
* Copyright (C) 1999 - 2003 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* 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 <linux/init.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/sysdev.h>
#include <linux/interrupt.h>
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/amba/pl061.h>
#include <linux/amba/mmci.h>
#include <linux/amba/pl022.h>
#include <linux/io.h>
#include <linux/gfp.h>
#include <linux/clkdev.h>
#include <linux/mtd/physmap.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/leds.h>
#include <asm/hardware/arm_timer.h>
#include <asm/hardware/icst.h>
#include <asm/hardware/vic.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>
#include <mach/hardware.h>
#include <mach/platform.h>
#include <asm/hardware/timer-sp.h>
#include <plat/clcd.h>
#include <plat/fpga-irq.h>
#include <plat/sched_clock.h>
#include "core.h"
/*
* All IO addresses are mapped onto VA 0xFFFx.xxxx, where x.xxxx
* is the (PA >> 12).
*
* Setup a VA for the Versatile Vectored Interrupt Controller.
*/
#define VA_VIC_BASE __io_address(VERSATILE_VIC_BASE)
#define VA_SIC_BASE __io_address(VERSATILE_SIC_BASE)
static struct fpga_irq_data sic_irq = {
.base = VA_SIC_BASE,
.irq_start = IRQ_SIC_START,
.chip.name = "SIC",
};
#if 1
#define IRQ_MMCI0A IRQ_VICSOURCE22
#define IRQ_AACI IRQ_VICSOURCE24
#define IRQ_ETH IRQ_VICSOURCE25
#define PIC_MASK 0xFFD00000
#else
#define IRQ_MMCI0A IRQ_SIC_MMCI0A
#define IRQ_AACI IRQ_SIC_AACI
#define IRQ_ETH IRQ_SIC_ETH
#define PIC_MASK 0
#endif
void __init versatile_init_irq(void)
{
vic_init(VA_VIC_BASE, IRQ_VIC_START, ~0, 0);
writel(~0, VA_SIC_BASE + SIC_IRQ_ENABLE_CLEAR);
fpga_irq_init(IRQ_VICSOURCE31, ~PIC_MASK, &sic_irq);
/*
* Interrupts on secondary controller from 0 to 8 are routed to
* source 31 on PIC.
* Interrupts from 21 to 31 are routed directly to the VIC on
* the corresponding number on primary controller. This is controlled
* by setting PIC_ENABLEx.
*/
writel(PIC_MASK, VA_SIC_BASE + SIC_INT_PIC_ENABLE);
}
static struct map_desc versatile_io_desc[] __initdata = {
{
.virtual = IO_ADDRESS(VERSATILE_SYS_BASE),
.pfn = __phys_to_pfn(VERSATILE_SYS_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = IO_ADDRESS(VERSATILE_SIC_BASE),
.pfn = __phys_to_pfn(VERSATILE_SIC_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = IO_ADDRESS(VERSATILE_VIC_BASE),
.pfn = __phys_to_pfn(VERSATILE_VIC_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = IO_ADDRESS(VERSATILE_SCTL_BASE),
.pfn = __phys_to_pfn(VERSATILE_SCTL_BASE),
.length = SZ_4K * 9,
.type = MT_DEVICE
},
#ifdef CONFIG_MACH_VERSATILE_AB
{
.virtual = IO_ADDRESS(VERSATILE_GPIO0_BASE),
.pfn = __phys_to_pfn(VERSATILE_GPIO0_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = IO_ADDRESS(VERSATILE_IB2_BASE),
.pfn = __phys_to_pfn(VERSATILE_IB2_BASE),
.length = SZ_64M,
.type = MT_DEVICE
},
#endif
#ifdef CONFIG_DEBUG_LL
{
.virtual = IO_ADDRESS(VERSATILE_UART0_BASE),
.pfn = __phys_to_pfn(VERSATILE_UART0_BASE),
.length = SZ_4K,
.type = MT_DEVICE
},
#endif
#ifdef CONFIG_PCI
{
.virtual = IO_ADDRESS(VERSATILE_PCI_CORE_BASE),
.pfn = __phys_to_pfn(VERSATILE_PCI_CORE_BASE),
.length = SZ_4K,
.type = MT_DEVICE
}, {
.virtual = (unsigned long)VERSATILE_PCI_VIRT_BASE,
.pfn = __phys_to_pfn(VERSATILE_PCI_BASE),
.length = VERSATILE_PCI_BASE_SIZE,
.type = MT_DEVICE
}, {
.virtual = (unsigned long)VERSATILE_PCI_CFG_VIRT_BASE,
.pfn = __phys_to_pfn(VERSATILE_PCI_CFG_BASE),
.length = VERSATILE_PCI_CFG_BASE_SIZE,
.type = MT_DEVICE
},
#if 0
{
.virtual = VERSATILE_PCI_VIRT_MEM_BASE0,
.pfn = __phys_to_pfn(VERSATILE_PCI_MEM_BASE0),
.length = SZ_16M,
.type = MT_DEVICE
}, {
.virtual = VERSATILE_PCI_VIRT_MEM_BASE1,
.pfn = __phys_to_pfn(VERSATILE_PCI_MEM_BASE1),
.length = SZ_16M,
.type = MT_DEVICE
}, {
.virtual = VERSATILE_PCI_VIRT_MEM_BASE2,
.pfn = __phys_to_pfn(VERSATILE_PCI_MEM_BASE2),
.length = SZ_16M,
.type = MT_DEVICE
},
#endif
#endif
};
void __init versatile_map_io(void)
{
iotable_init(versatile_io_desc, ARRAY_SIZE(versatile_io_desc));
}
#define VERSATILE_FLASHCTRL (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_FLASH_OFFSET)
static void versatile_flash_set_vpp(struct platform_device *pdev, int on)
{
u32 val;
val = __raw_readl(VERSATILE_FLASHCTRL);
if (on)
val |= VERSATILE_FLASHPROG_FLVPPEN;
else
val &= ~VERSATILE_FLASHPROG_FLVPPEN;
__raw_writel(val, VERSATILE_FLASHCTRL);
}
static struct physmap_flash_data versatile_flash_data = {
.width = 4,
.set_vpp = versatile_flash_set_vpp,
};
static struct resource versatile_flash_resource = {
.start = VERSATILE_FLASH_BASE,
.end = VERSATILE_FLASH_BASE + VERSATILE_FLASH_SIZE - 1,
.flags = IORESOURCE_MEM,
};
static struct platform_device versatile_flash_device = {
.name = "physmap-flash",
.id = 0,
.dev = {
.platform_data = &versatile_flash_data,
},
.num_resources = 1,
.resource = &versatile_flash_resource,
};
static struct resource smc91x_resources[] = {
[0] = {
.start = VERSATILE_ETH_BASE,
.end = VERSATILE_ETH_BASE + SZ_64K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_ETH,
.end = IRQ_ETH,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device smc91x_device = {
.name = "smc91x",
.id = 0,
.num_resources = ARRAY_SIZE(smc91x_resources),
.resource = smc91x_resources,
};
static struct resource versatile_i2c_resource = {
.start = VERSATILE_I2C_BASE,
.end = VERSATILE_I2C_BASE + SZ_4K - 1,
.flags = IORESOURCE_MEM,
};
static struct platform_device versatile_i2c_device = {
.name = "versatile-i2c",
.id = 0,
.num_resources = 1,
.resource = &versatile_i2c_resource,
};
static struct i2c_board_info versatile_i2c_board_info[] = {
{
I2C_BOARD_INFO("ds1338", 0xd0 >> 1),
},
};
static int __init versatile_i2c_init(void)
{
return i2c_register_board_info(0, versatile_i2c_board_info,
ARRAY_SIZE(versatile_i2c_board_info));
}
arch_initcall(versatile_i2c_init);
#define VERSATILE_SYSMCI (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_MCI_OFFSET)
unsigned int mmc_status(struct device *dev)
{
struct amba_device *adev = container_of(dev, struct amba_device, dev);
u32 mask;
if (adev->res.start == VERSATILE_MMCI0_BASE)
mask = 1;
else
mask = 2;
return readl(VERSATILE_SYSMCI) & mask;
}
static struct mmci_platform_data mmc0_plat_data = {
.ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
.status = mmc_status,
.gpio_wp = -1,
.gpio_cd = -1,
};
static struct resource char_lcd_resources[] = {
{
.start = VERSATILE_CHAR_LCD_BASE,
.end = (VERSATILE_CHAR_LCD_BASE + SZ_4K - 1),
.flags = IORESOURCE_MEM,
},
};
static struct platform_device char_lcd_device = {
.name = "arm-charlcd",
.id = -1,
.num_resources = ARRAY_SIZE(char_lcd_resources),
.resource = char_lcd_resources,
};
/*
* Clock handling
*/
static const struct icst_params versatile_oscvco_params = {
.ref = 24000000,
.vco_max = ICST307_VCO_MAX,
.vco_min = ICST307_VCO_MIN,
.vd_min = 4 + 8,
.vd_max = 511 + 8,
.rd_min = 1 + 2,
.rd_max = 127 + 2,
.s2div = icst307_s2div,
.idx2s = icst307_idx2s,
};
static void versatile_oscvco_set(struct clk *clk, struct icst_vco vco)
{
void __iomem *sys_lock = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LOCK_OFFSET;
u32 val;
val = readl(clk->vcoreg) & ~0x7ffff;
val |= vco.v | (vco.r << 9) | (vco.s << 16);
writel(0xa05f, sys_lock);
writel(val, clk->vcoreg);
writel(0, sys_lock);
}
static const struct clk_ops osc4_clk_ops = {
.round = icst_clk_round,
.set = icst_clk_set,
.setvco = versatile_oscvco_set,
};
static struct clk osc4_clk = {
.ops = &osc4_clk_ops,
.params = &versatile_oscvco_params,
};
/*
* These are fixed clocks.
*/
static struct clk ref24_clk = {
.rate = 24000000,
};
static struct clk sp804_clk = {
.rate = 1000000,
};
static struct clk dummy_apb_pclk;
static struct clk_lookup lookups[] = {
{ /* AMBA bus clock */
.con_id = "apb_pclk",
.clk = &dummy_apb_pclk,
}, { /* UART0 */
.dev_id = "dev:f1",
.clk = &ref24_clk,
}, { /* UART1 */
.dev_id = "dev:f2",
.clk = &ref24_clk,
}, { /* UART2 */
.dev_id = "dev:f3",
.clk = &ref24_clk,
}, { /* UART3 */
.dev_id = "fpga:09",
.clk = &ref24_clk,
}, { /* KMI0 */
.dev_id = "fpga:06",
.clk = &ref24_clk,
}, { /* KMI1 */
.dev_id = "fpga:07",
.clk = &ref24_clk,
}, { /* MMC0 */
.dev_id = "fpga:05",
.clk = &ref24_clk,
}, { /* MMC1 */
.dev_id = "fpga:0b",
.clk = &ref24_clk,
}, { /* SSP */
.dev_id = "dev:f4",
.clk = &ref24_clk,
}, { /* CLCD */
.dev_id = "dev:20",
.clk = &osc4_clk,
}, { /* SP804 timers */
.dev_id = "sp804",
.clk = &sp804_clk,
},
};
/*
* CLCD support.
*/
#define SYS_CLCD_MODE_MASK (3 << 0)
#define SYS_CLCD_MODE_888 (0 << 0)
#define SYS_CLCD_MODE_5551 (1 << 0)
#define SYS_CLCD_MODE_565_RLSB (2 << 0)
#define SYS_CLCD_MODE_565_BLSB (3 << 0)
#define SYS_CLCD_NLCDIOON (1 << 2)
#define SYS_CLCD_VDDPOSSWITCH (1 << 3)
#define SYS_CLCD_PWR3V5SWITCH (1 << 4)
#define SYS_CLCD_ID_MASK (0x1f << 8)
#define SYS_CLCD_ID_SANYO_3_8 (0x00 << 8)
#define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
#define SYS_CLCD_ID_EPSON_2_2 (0x02 << 8)
#define SYS_CLCD_ID_SANYO_2_5 (0x07 << 8)
#define SYS_CLCD_ID_VGA (0x1f << 8)
static bool is_sanyo_2_5_lcd;
/*
* Disable all display connectors on the interface module.
*/
static void versatile_clcd_disable(struct clcd_fb *fb)
{
void __iomem *sys_clcd = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_CLCD_OFFSET;
u32 val;
val = readl(sys_clcd);
val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
writel(val, sys_clcd);
#ifdef CONFIG_MACH_VERSATILE_AB
/*
* If the LCD is Sanyo 2x5 in on the IB2 board, turn the back-light off
*/
if (machine_is_versatile_ab() && is_sanyo_2_5_lcd) {
void __iomem *versatile_ib2_ctrl = __io_address(VERSATILE_IB2_CTRL);
unsigned long ctrl;
ctrl = readl(versatile_ib2_ctrl);
ctrl &= ~0x01;
writel(ctrl, versatile_ib2_ctrl);
}
#endif
}
/*
* Enable the relevant connector on the interface module.
*/
static void versatile_clcd_enable(struct clcd_fb *fb)
{
struct fb_var_screeninfo *var = &fb->fb.var;
void __iomem *sys_clcd = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_CLCD_OFFSET;
u32 val;
val = readl(sys_clcd);
val &= ~SYS_CLCD_MODE_MASK;
switch (var->green.length) {
case 5:
val |= SYS_CLCD_MODE_5551;
break;
case 6:
if (var->red.offset == 0)
val |= SYS_CLCD_MODE_565_RLSB;
else
val |= SYS_CLCD_MODE_565_BLSB;
break;
case 8:
val |= SYS_CLCD_MODE_888;
break;
}
/*
* Set the MUX
*/
writel(val, sys_clcd);
/*
* And now enable the PSUs
*/
val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
writel(val, sys_clcd);
#ifdef CONFIG_MACH_VERSATILE_AB
/*
* If the LCD is Sanyo 2x5 in on the IB2 board, turn the back-light on
*/
if (machine_is_versatile_ab() && is_sanyo_2_5_lcd) {
void __iomem *versatile_ib2_ctrl = __io_address(VERSATILE_IB2_CTRL);
unsigned long ctrl;
ctrl = readl(versatile_ib2_ctrl);
ctrl |= 0x01;
writel(ctrl, versatile_ib2_ctrl);
}
#endif
}
/*
* Detect which LCD panel is connected, and return the appropriate
* clcd_panel structure. Note: we do not have any information on
* the required timings for the 8.4in panel, so we presently assume
* VGA timings.
*/
static int versatile_clcd_setup(struct clcd_fb *fb)
{
void __iomem *sys_clcd = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_CLCD_OFFSET;
const char *panel_name;
u32 val;
is_sanyo_2_5_lcd = false;
val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
if (val == SYS_CLCD_ID_SANYO_3_8)
panel_name = "Sanyo TM38QV67A02A";
else if (val == SYS_CLCD_ID_SANYO_2_5) {
panel_name = "Sanyo QVGA Portrait";
is_sanyo_2_5_lcd = true;
} else if (val == SYS_CLCD_ID_EPSON_2_2)
panel_name = "Epson L2F50113T00";
else if (val == SYS_CLCD_ID_VGA)
panel_name = "VGA";
else {
printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
val);
panel_name = "VGA";
}
fb->panel = versatile_clcd_get_panel(panel_name);
if (!fb->panel)
return -EINVAL;
return versatile_clcd_setup_dma(fb, SZ_1M);
}
static void versatile_clcd_decode(struct clcd_fb *fb, struct clcd_regs *regs)
{
clcdfb_decode(fb, regs);
/* Always clear BGR for RGB565: we do the routing externally */
if (fb->fb.var.green.length == 6)
regs->cntl &= ~CNTL_BGR;
}
static struct clcd_board clcd_plat_data = {
.name = "Versatile",
.caps = CLCD_CAP_5551 | CLCD_CAP_565 | CLCD_CAP_888,
.check = clcdfb_check,
.decode = versatile_clcd_decode,
.disable = versatile_clcd_disable,
.enable = versatile_clcd_enable,
.setup = versatile_clcd_setup,
.mmap = versatile_clcd_mmap_dma,
.remove = versatile_clcd_remove_dma,
};
static struct pl061_platform_data gpio0_plat_data = {
.gpio_base = 0,
.irq_base = IRQ_GPIO0_START,
};
static struct pl061_platform_data gpio1_plat_data = {
.gpio_base = 8,
.irq_base = IRQ_GPIO1_START,
};
static struct pl022_ssp_controller ssp0_plat_data = {
.bus_id = 0,
.enable_dma = 0,
.num_chipselect = 1,
};
#define AACI_IRQ { IRQ_AACI, NO_IRQ }
#define MMCI0_IRQ { IRQ_MMCI0A,IRQ_SIC_MMCI0B }
#define KMI0_IRQ { IRQ_SIC_KMI0, NO_IRQ }
#define KMI1_IRQ { IRQ_SIC_KMI1, NO_IRQ }
/*
* These devices are connected directly to the multi-layer AHB switch
*/
#define SMC_IRQ { NO_IRQ, NO_IRQ }
#define MPMC_IRQ { NO_IRQ, NO_IRQ }
#define CLCD_IRQ { IRQ_CLCDINT, NO_IRQ }
#define DMAC_IRQ { IRQ_DMAINT, NO_IRQ }
/*
* These devices are connected via the core APB bridge
*/
#define SCTL_IRQ { NO_IRQ, NO_IRQ }
#define WATCHDOG_IRQ { IRQ_WDOGINT, NO_IRQ }
#define GPIO0_IRQ { IRQ_GPIOINT0, NO_IRQ }
#define GPIO1_IRQ { IRQ_GPIOINT1, NO_IRQ }
#define RTC_IRQ { IRQ_RTCINT, NO_IRQ }
/*
* These devices are connected via the DMA APB bridge
*/
#define SCI_IRQ { IRQ_SCIINT, NO_IRQ }
#define UART0_IRQ { IRQ_UARTINT0, NO_IRQ }
#define UART1_IRQ { IRQ_UARTINT1, NO_IRQ }
#define UART2_IRQ { IRQ_UARTINT2, NO_IRQ }
#define SSP_IRQ { IRQ_SSPINT, NO_IRQ }
/* FPGA Primecells */
AMBA_DEVICE(aaci, "fpga:04", AACI, NULL);
AMBA_DEVICE(mmc0, "fpga:05", MMCI0, &mmc0_plat_data);
AMBA_DEVICE(kmi0, "fpga:06", KMI0, NULL);
AMBA_DEVICE(kmi1, "fpga:07", KMI1, NULL);
/* DevChip Primecells */
AMBA_DEVICE(smc, "dev:00", SMC, NULL);
AMBA_DEVICE(mpmc, "dev:10", MPMC, NULL);
AMBA_DEVICE(clcd, "dev:20", CLCD, &clcd_plat_data);
AMBA_DEVICE(dmac, "dev:30", DMAC, NULL);
AMBA_DEVICE(sctl, "dev:e0", SCTL, NULL);
AMBA_DEVICE(wdog, "dev:e1", WATCHDOG, NULL);
AMBA_DEVICE(gpio0, "dev:e4", GPIO0, &gpio0_plat_data);
AMBA_DEVICE(gpio1, "dev:e5", GPIO1, &gpio1_plat_data);
AMBA_DEVICE(rtc, "dev:e8", RTC, NULL);
AMBA_DEVICE(sci0, "dev:f0", SCI, NULL);
AMBA_DEVICE(uart0, "dev:f1", UART0, NULL);
AMBA_DEVICE(uart1, "dev:f2", UART1, NULL);
AMBA_DEVICE(uart2, "dev:f3", UART2, NULL);
AMBA_DEVICE(ssp0, "dev:f4", SSP, &ssp0_plat_data);
static struct amba_device *amba_devs[] __initdata = {
&dmac_device,
&uart0_device,
&uart1_device,
&uart2_device,
&smc_device,
&mpmc_device,
&clcd_device,
&sctl_device,
&wdog_device,
&gpio0_device,
&gpio1_device,
&rtc_device,
&sci0_device,
&ssp0_device,
&aaci_device,
&mmc0_device,
&kmi0_device,
&kmi1_device,
};
#ifdef CONFIG_LEDS
#define VA_LEDS_BASE (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LED_OFFSET)
static void versatile_leds_event(led_event_t ledevt)
{
unsigned long flags;
u32 val;
local_irq_save(flags);
val = readl(VA_LEDS_BASE);
switch (ledevt) {
case led_idle_start:
val = val & ~VERSATILE_SYS_LED0;
break;
case led_idle_end:
val = val | VERSATILE_SYS_LED0;
break;
case led_timer:
val = val ^ VERSATILE_SYS_LED1;
break;
case led_halted:
val = 0;
break;
default:
break;
}
writel(val, VA_LEDS_BASE);
local_irq_restore(flags);
}
#endif /* CONFIG_LEDS */
/* Early initializations */
void __init versatile_init_early(void)
{
void __iomem *sys = __io_address(VERSATILE_SYS_BASE);
osc4_clk.vcoreg = sys + VERSATILE_SYS_OSCCLCD_OFFSET;
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
versatile_sched_clock_init(sys + VERSATILE_SYS_24MHz_OFFSET, 24000000);
}
void __init versatile_init(void)
{
int i;
platform_device_register(&versatile_flash_device);
platform_device_register(&versatile_i2c_device);
platform_device_register(&smc91x_device);
platform_device_register(&char_lcd_device);
for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
struct amba_device *d = amba_devs[i];
amba_device_register(d, &iomem_resource);
}
#ifdef CONFIG_LEDS
leds_event = versatile_leds_event;
#endif
}
/*
* Where is the timer (VA)?
*/
#define TIMER0_VA_BASE __io_address(VERSATILE_TIMER0_1_BASE)
#define TIMER1_VA_BASE (__io_address(VERSATILE_TIMER0_1_BASE) + 0x20)
#define TIMER2_VA_BASE __io_address(VERSATILE_TIMER2_3_BASE)
#define TIMER3_VA_BASE (__io_address(VERSATILE_TIMER2_3_BASE) + 0x20)
/*
* Set up timer interrupt, and return the current time in seconds.
*/
static void __init versatile_timer_init(void)
{
u32 val;
/*
* set clock frequency:
* VERSATILE_REFCLK is 32KHz
* VERSATILE_TIMCLK is 1MHz
*/
val = readl(__io_address(VERSATILE_SCTL_BASE));
writel((VERSATILE_TIMCLK << VERSATILE_TIMER1_EnSel) |
(VERSATILE_TIMCLK << VERSATILE_TIMER2_EnSel) |
(VERSATILE_TIMCLK << VERSATILE_TIMER3_EnSel) |
(VERSATILE_TIMCLK << VERSATILE_TIMER4_EnSel) | val,
__io_address(VERSATILE_SCTL_BASE));
/*
* Initialise to a known state (all timers off)
*/
writel(0, TIMER0_VA_BASE + TIMER_CTRL);
writel(0, TIMER1_VA_BASE + TIMER_CTRL);
writel(0, TIMER2_VA_BASE + TIMER_CTRL);
writel(0, TIMER3_VA_BASE + TIMER_CTRL);
sp804_clocksource_init(TIMER3_VA_BASE, "timer3");
sp804_clockevents_init(TIMER0_VA_BASE, IRQ_TIMERINT0_1, "timer0");
}
struct sys_timer versatile_timer = {
.init = versatile_timer_init,
};
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