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linux/arch/arm/mach-at91/sama5d3.c
Johan Hovold 6de714c21a ARM: at91: fix hanged boot due to early rtc-interrupt 
Make sure the RTC-interrupts are masked at boot by adding a new helper
function to be used at SOC-init.

This fixes hanged boot on all AT91 SOCs with an RTC (but RM9200), for
example, after a reset during an RTC-update or if an RTC-alarm goes off
after shutdown (e.g. when using RTC wakeup).

The RTC and RTT-peripherals are powered by backup power (VDDBU) (on all
AT91 SOCs but RM9200) and are not reset on wake-up, user, watchdog or
software reset. This means that their interrupts may be enabled during
early boot if, for example, they where not disabled during a previous
shutdown (e.g. due to a buggy driver or a non-clean shutdown such as a
user reset). Furthermore, an RTC or RTT-alarm may also be active.

The RTC and RTT-interrupts use the shared system-interrupt line, which
is also used by the PIT, and if an interrupt occurs before a handler
(e.g. RTC-driver) has been installed this leads to the system interrupt
being disabled and prevents the system from booting.

Note that when boot hangs due to an early RTC or RTT-interrupt, the only
way to get the system to start again is to remove the backup power (e.g.
battery) or to disable the interrupt manually from the bootloader. In
particular, a user reset is not sufficient.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable@vger.kernel.org # 3.11.x
2013-11-15 12:13:33 +01:00

384 lines
9.5 KiB
C
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/*
* Chip-specific setup code for the SAMA5D3 family
*
* Copyright (C) 2013 Atmel,
* 2013 Ludovic Desroches <ludovic.desroches@atmel.com>
*
* Licensed under GPLv2 or later.
*/
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <asm/irq.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <mach/sama5d3.h>
#include <mach/at91_pmc.h>
#include <mach/cpu.h>
#include "soc.h"
#include "generic.h"
#include "clock.h"
#include "sam9_smc.h"
/* --------------------------------------------------------------------
* Clocks
* -------------------------------------------------------------------- */
/*
* The peripheral clocks.
*/
static struct clk pioA_clk = {
.name = "pioA_clk",
.pid = SAMA5D3_ID_PIOA,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk pioB_clk = {
.name = "pioB_clk",
.pid = SAMA5D3_ID_PIOB,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk pioC_clk = {
.name = "pioC_clk",
.pid = SAMA5D3_ID_PIOC,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk pioD_clk = {
.name = "pioD_clk",
.pid = SAMA5D3_ID_PIOD,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk pioE_clk = {
.name = "pioE_clk",
.pid = SAMA5D3_ID_PIOE,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk usart0_clk = {
.name = "usart0_clk",
.pid = SAMA5D3_ID_USART0,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk usart1_clk = {
.name = "usart1_clk",
.pid = SAMA5D3_ID_USART1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk usart2_clk = {
.name = "usart2_clk",
.pid = SAMA5D3_ID_USART2,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk usart3_clk = {
.name = "usart3_clk",
.pid = SAMA5D3_ID_USART3,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk uart0_clk = {
.name = "uart0_clk",
.pid = SAMA5D3_ID_UART0,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk uart1_clk = {
.name = "uart1_clk",
.pid = SAMA5D3_ID_UART1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk twi0_clk = {
.name = "twi0_clk",
.pid = SAMA5D3_ID_TWI0,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk twi1_clk = {
.name = "twi1_clk",
.pid = SAMA5D3_ID_TWI1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk twi2_clk = {
.name = "twi2_clk",
.pid = SAMA5D3_ID_TWI2,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk mmc0_clk = {
.name = "mci0_clk",
.pid = SAMA5D3_ID_HSMCI0,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk mmc1_clk = {
.name = "mci1_clk",
.pid = SAMA5D3_ID_HSMCI1,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk mmc2_clk = {
.name = "mci2_clk",
.pid = SAMA5D3_ID_HSMCI2,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk spi0_clk = {
.name = "spi0_clk",
.pid = SAMA5D3_ID_SPI0,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk spi1_clk = {
.name = "spi1_clk",
.pid = SAMA5D3_ID_SPI1,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk tcb0_clk = {
.name = "tcb0_clk",
.pid = SAMA5D3_ID_TC0,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk tcb1_clk = {
.name = "tcb1_clk",
.pid = SAMA5D3_ID_TC1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk adc_clk = {
.name = "adc_clk",
.pid = SAMA5D3_ID_ADC,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk adc_op_clk = {
.name = "adc_op_clk",
.type = CLK_TYPE_PERIPHERAL,
.rate_hz = 5000000,
};
static struct clk dma0_clk = {
.name = "dma0_clk",
.pid = SAMA5D3_ID_DMA0,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk dma1_clk = {
.name = "dma1_clk",
.pid = SAMA5D3_ID_DMA1,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk uhphs_clk = {
.name = "uhphs",
.pid = SAMA5D3_ID_UHPHS,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk udphs_clk = {
.name = "udphs_clk",
.pid = SAMA5D3_ID_UDPHS,
.type = CLK_TYPE_PERIPHERAL,
};
/* gmac only for sama5d33, sama5d34, sama5d35 */
static struct clk macb0_clk = {
.name = "macb0_clk",
.pid = SAMA5D3_ID_GMAC,
.type = CLK_TYPE_PERIPHERAL,
};
/* emac only for sama5d31, sama5d35 */
static struct clk macb1_clk = {
.name = "macb1_clk",
.pid = SAMA5D3_ID_EMAC,
.type = CLK_TYPE_PERIPHERAL,
};
/* lcd only for sama5d31, sama5d33, sama5d34 */
static struct clk lcdc_clk = {
.name = "lcdc_clk",
.pid = SAMA5D3_ID_LCDC,
.type = CLK_TYPE_PERIPHERAL,
};
/* isi only for sama5d33, sama5d35 */
static struct clk isi_clk = {
.name = "isi_clk",
.pid = SAMA5D3_ID_ISI,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk can0_clk = {
.name = "can0_clk",
.pid = SAMA5D3_ID_CAN0,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk can1_clk = {
.name = "can1_clk",
.pid = SAMA5D3_ID_CAN1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk ssc0_clk = {
.name = "ssc0_clk",
.pid = SAMA5D3_ID_SSC0,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk ssc1_clk = {
.name = "ssc1_clk",
.pid = SAMA5D3_ID_SSC1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV2,
};
static struct clk sha_clk = {
.name = "sha_clk",
.pid = SAMA5D3_ID_SHA,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV8,
};
static struct clk aes_clk = {
.name = "aes_clk",
.pid = SAMA5D3_ID_AES,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk tdes_clk = {
.name = "tdes_clk",
.pid = SAMA5D3_ID_TDES,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk *periph_clocks[] __initdata = {
&pioA_clk,
&pioB_clk,
&pioC_clk,
&pioD_clk,
&pioE_clk,
&usart0_clk,
&usart1_clk,
&usart2_clk,
&usart3_clk,
&uart0_clk,
&uart1_clk,
&twi0_clk,
&twi1_clk,
&twi2_clk,
&mmc0_clk,
&mmc1_clk,
&mmc2_clk,
&spi0_clk,
&spi1_clk,
&tcb0_clk,
&tcb1_clk,
&adc_clk,
&adc_op_clk,
&dma0_clk,
&dma1_clk,
&uhphs_clk,
&udphs_clk,
&macb0_clk,
&macb1_clk,
&lcdc_clk,
&isi_clk,
&can0_clk,
&can1_clk,
&ssc0_clk,
&ssc1_clk,
&sha_clk,
&aes_clk,
&tdes_clk,
};
static struct clk pck0 = {
.name = "pck0",
.pmc_mask = AT91_PMC_PCK0,
.type = CLK_TYPE_PROGRAMMABLE,
.id = 0,
};
static struct clk pck1 = {
.name = "pck1",
.pmc_mask = AT91_PMC_PCK1,
.type = CLK_TYPE_PROGRAMMABLE,
.id = 1,
};
static struct clk pck2 = {
.name = "pck2",
.pmc_mask = AT91_PMC_PCK2,
.type = CLK_TYPE_PROGRAMMABLE,
.id = 2,
};
static struct clk_lookup periph_clocks_lookups[] = {
/* lookup table for DT entries */
CLKDEV_CON_DEV_ID("usart", "ffffee00.serial", &mck),
CLKDEV_CON_DEV_ID(NULL, "fffff200.gpio", &pioA_clk),
CLKDEV_CON_DEV_ID(NULL, "fffff400.gpio", &pioB_clk),
CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioC_clk),
CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioD_clk),
CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioE_clk),
CLKDEV_CON_DEV_ID("usart", "f001c000.serial", &usart0_clk),
CLKDEV_CON_DEV_ID("usart", "f0020000.serial", &usart1_clk),
CLKDEV_CON_DEV_ID("usart", "f8020000.serial", &usart2_clk),
CLKDEV_CON_DEV_ID("usart", "f8024000.serial", &usart3_clk),
CLKDEV_CON_DEV_ID(NULL, "f0014000.i2c", &twi0_clk),
CLKDEV_CON_DEV_ID(NULL, "f0018000.i2c", &twi1_clk),
CLKDEV_CON_DEV_ID(NULL, "f801c000.i2c", &twi2_clk),
CLKDEV_CON_DEV_ID("mci_clk", "f0000000.mmc", &mmc0_clk),
CLKDEV_CON_DEV_ID("mci_clk", "f8000000.mmc", &mmc1_clk),
CLKDEV_CON_DEV_ID("mci_clk", "f8004000.mmc", &mmc2_clk),
CLKDEV_CON_DEV_ID("spi_clk", "f0004000.spi", &spi0_clk),
CLKDEV_CON_DEV_ID("spi_clk", "f8008000.spi", &spi1_clk),
CLKDEV_CON_DEV_ID("t0_clk", "f0010000.timer", &tcb0_clk),
CLKDEV_CON_DEV_ID("t0_clk", "f8014000.timer", &tcb1_clk),
CLKDEV_CON_DEV_ID("tsc_clk", "f8018000.tsadcc", &adc_clk),
CLKDEV_CON_DEV_ID("dma_clk", "ffffe600.dma-controller", &dma0_clk),
CLKDEV_CON_DEV_ID("dma_clk", "ffffe800.dma-controller", &dma1_clk),
CLKDEV_CON_DEV_ID("hclk", "600000.ohci", &uhphs_clk),
CLKDEV_CON_DEV_ID("ohci_clk", "600000.ohci", &uhphs_clk),
CLKDEV_CON_DEV_ID("ehci_clk", "700000.ehci", &uhphs_clk),
CLKDEV_CON_DEV_ID("pclk", "500000.gadget", &udphs_clk),
CLKDEV_CON_DEV_ID("hclk", "500000.gadget", &utmi_clk),
CLKDEV_CON_DEV_ID("hclk", "f0028000.ethernet", &macb0_clk),
CLKDEV_CON_DEV_ID("pclk", "f0028000.ethernet", &macb0_clk),
CLKDEV_CON_DEV_ID("hclk", "f802c000.ethernet", &macb1_clk),
CLKDEV_CON_DEV_ID("pclk", "f802c000.ethernet", &macb1_clk),
CLKDEV_CON_DEV_ID("pclk", "f0008000.ssc", &ssc0_clk),
CLKDEV_CON_DEV_ID("pclk", "f000c000.ssc", &ssc1_clk),
CLKDEV_CON_DEV_ID("can_clk", "f000c000.can", &can0_clk),
CLKDEV_CON_DEV_ID("can_clk", "f8010000.can", &can1_clk),
CLKDEV_CON_DEV_ID("sha_clk", "f8034000.sha", &sha_clk),
CLKDEV_CON_DEV_ID("aes_clk", "f8038000.aes", &aes_clk),
CLKDEV_CON_DEV_ID("tdes_clk", "f803c000.tdes", &tdes_clk),
};
static void __init sama5d3_register_clocks(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(periph_clocks); i++)
clk_register(periph_clocks[i]);
clkdev_add_table(periph_clocks_lookups,
ARRAY_SIZE(periph_clocks_lookups));
clk_register(&pck0);
clk_register(&pck1);
clk_register(&pck2);
}
/* --------------------------------------------------------------------
* AT91SAM9x5 processor initialization
* -------------------------------------------------------------------- */
static void __init sama5d3_map_io(void)
{
at91_init_sram(0, SAMA5D3_SRAM_BASE, SAMA5D3_SRAM_SIZE);
}
static void __init sama5d3_initialize(void)
{
at91_sysirq_mask_rtc(SAMA5D3_BASE_RTC);
}
AT91_SOC_START(sama5d3)
.map_io = sama5d3_map_io,
.register_clocks = sama5d3_register_clocks,
.init = sama5d3_initialize,
AT91_SOC_END
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