ba327b1e52
This adjusts the clockrate for the MTU timer. On the different UX500 variants this rate is different. The platform can also have been set up at hardware initialization, bootloader or early init for different clock speeds. To have the clock framework available early so the timers can use them, the clock initialization for Nomadik and ux500 is moved to IRQ init time. A custom per-clock callback is added to handle special cases like this. This solves a user-visible bug: without this patch the current UX500 platforms will not be synchronized to wall-clock time and the platform will drift in time. Acked-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
/*
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* Copyright STMicroelectronics, 2007.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <mach/hardware.h>
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#include <mach/irqs.h>
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#include <asm/mach/map.h>
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#include <asm/hardware/vic.h>
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#include <asm/cacheflush.h>
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#include <asm/hardware/cache-l2x0.h>
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#include "clock.h"
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#define __MEM_4K_RESOURCE(x) \
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.res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM}
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/* The 8815 has 4 GPIO blocks, let's register them immediately */
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#define GPIO_RESOURCE(block) \
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{ \
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.start = NOMADIK_GPIO##block##_BASE, \
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.end = NOMADIK_GPIO##block##_BASE + SZ_4K - 1, \
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.flags = IORESOURCE_MEM, \
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}, \
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{ \
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.start = IRQ_GPIO##block, \
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.end = IRQ_GPIO##block, \
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.flags = IORESOURCE_IRQ, \
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}
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#define GPIO_DEVICE(block) \
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{ \
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.name = "gpio", \
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.id = block, \
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.num_resources = 2, \
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.resource = &cpu8815_gpio_resources[block * 2], \
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.dev = { \
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.platform_data = &cpu8815_gpio[block], \
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}, \
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}
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static struct nmk_gpio_platform_data cpu8815_gpio[] = {
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{
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.name = "GPIO-0-31",
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.first_gpio = 0,
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.first_irq = NOMADIK_GPIO_TO_IRQ(0),
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}, {
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.name = "GPIO-32-63",
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.first_gpio = 32,
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.first_irq = NOMADIK_GPIO_TO_IRQ(32),
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}, {
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.name = "GPIO-64-95",
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.first_gpio = 64,
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.first_irq = NOMADIK_GPIO_TO_IRQ(64),
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}, {
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.name = "GPIO-96-127", /* 124..127 not routed to pin */
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.first_gpio = 96,
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.first_irq = NOMADIK_GPIO_TO_IRQ(96),
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}
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};
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static struct resource cpu8815_gpio_resources[] = {
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GPIO_RESOURCE(0),
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GPIO_RESOURCE(1),
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GPIO_RESOURCE(2),
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GPIO_RESOURCE(3),
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};
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static struct platform_device cpu8815_platform_gpio[] = {
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GPIO_DEVICE(0),
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GPIO_DEVICE(1),
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GPIO_DEVICE(2),
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GPIO_DEVICE(3),
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};
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static struct amba_device cpu8815_amba_rng = {
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.dev = {
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.init_name = "rng",
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},
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__MEM_4K_RESOURCE(NOMADIK_RNG_BASE),
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};
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static struct platform_device *platform_devs[] __initdata = {
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cpu8815_platform_gpio + 0,
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cpu8815_platform_gpio + 1,
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cpu8815_platform_gpio + 2,
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cpu8815_platform_gpio + 3,
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};
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static struct amba_device *amba_devs[] __initdata = {
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&cpu8815_amba_rng
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};
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static int __init cpu8815_init(void)
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{
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int i;
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platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
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for (i = 0; i < ARRAY_SIZE(amba_devs); i++)
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amba_device_register(amba_devs[i], &iomem_resource);
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return 0;
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}
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arch_initcall(cpu8815_init);
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/* All SoC devices live in the same area (see hardware.h) */
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static struct map_desc nomadik_io_desc[] __initdata = {
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{
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.virtual = NOMADIK_IO_VIRTUAL,
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.pfn = __phys_to_pfn(NOMADIK_IO_PHYSICAL),
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.length = NOMADIK_IO_SIZE,
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.type = MT_DEVICE,
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}
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/* static ram and secured ram may be added later */
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};
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void __init cpu8815_map_io(void)
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{
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iotable_init(nomadik_io_desc, ARRAY_SIZE(nomadik_io_desc));
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}
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void __init cpu8815_init_irq(void)
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{
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/* This modified VIC cell has two register blocks, at 0 and 0x20 */
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vic_init(io_p2v(NOMADIK_IC_BASE + 0x00), IRQ_VIC_START + 0, ~0, 0);
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vic_init(io_p2v(NOMADIK_IC_BASE + 0x20), IRQ_VIC_START + 32, ~0, 0);
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/*
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* Init clocks here so that they are available for system timer
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* initialization.
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*/
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clk_init();
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}
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/*
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* This function is called from the board init ("init_machine").
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*/
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void __init cpu8815_platform_init(void)
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{
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#ifdef CONFIG_CACHE_L2X0
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/* At full speed latency must be >=2, so 0x249 in low bits */
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l2x0_init(io_p2v(NOMADIK_L2CC_BASE), 0x00730249, 0xfe000fff);
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#endif
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return;
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}
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