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linux_dsm_epyc7002/arch/arm/mach-at91/sama5d3.c
Ludovic Desroches 58e7b1d582 ARM: at91: sama5d3: reduce TWI internal clock frequency 
With some devices, transfer hangs during I2C frame transmission. This issue
disappears when reducing the internal frequency of the TWI IP. Even if it is
indicated that internal clock max frequency is 66MHz, it seems we have
oversampling on I2C signals making TWI believe that a transfer in progress
is done.

This fix has no impact on the I2C bus frequency.

Cc: <stable@vger.kernel.org> #3.10+
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2013-12-02 14:14:42 +01:00

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9.5 KiB
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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_DIV8,
};
static struct clk twi1_clk = {
.name = "twi1_clk",
.pid = SAMA5D3_ID_TWI1,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV8,
};
static struct clk twi2_clk = {
.name = "twi2_clk",
.pid = SAMA5D3_ID_TWI2,
.type = CLK_TYPE_PERIPHERAL,
.div = AT91_PMC_PCR_DIV8,
};
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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