407 lines
13 KiB
C
407 lines
13 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2011 by Amaury Pouly
|
|
*
|
|
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#include "system.h"
|
|
#include "kernel.h"
|
|
#include "ssp-imx233.h"
|
|
#include "clkctrl-imx233.h"
|
|
#include "pinctrl-imx233.h"
|
|
#include "dma-imx233.h"
|
|
|
|
/* for debug purpose */
|
|
#if 0
|
|
#define ASSERT_SSP(ssp) if(ssp < 1 || ssp > 2) panicf("ssp=%d in %s", ssp, __func__);
|
|
#else
|
|
#define ASSERT_SSP(ssp) (void) ssp;
|
|
#endif
|
|
|
|
/* Hack to handle both single and multi devices at once */
|
|
#define SSP_SETn(reg, n, field) BF_SETn(reg, n, field)
|
|
#define SSP_CLRn(reg, n, field) BF_CLRn(reg, n, field)
|
|
#define SSP_RDn(reg, n, field) BF_RDn(reg, n, field)
|
|
#define SSP_WRn(reg, n, field, val) BF_WRn(reg, n, field, val)
|
|
#define SSP_WRn_V(reg, n, field, val) BF_WRn_V(reg, n, field, val)
|
|
#define SSP_REGn(reg, n) HW_##reg(n)
|
|
|
|
/* Used for DMA */
|
|
struct ssp_dma_command_t
|
|
{
|
|
struct apb_dma_command_t dma;
|
|
/* PIO words */
|
|
uint32_t ctrl0;
|
|
uint32_t cmd0;
|
|
uint32_t cmd1;
|
|
/* padded to next multiple of cache line size (32 bytes) */
|
|
uint32_t pad[2];
|
|
} __attribute__((packed)) CACHEALIGN_ATTR;
|
|
|
|
__ENSURE_STRUCT_CACHE_FRIENDLY(struct ssp_dma_command_t)
|
|
|
|
static bool ssp_in_use[IMX233_NR_SSP];
|
|
static int ssp_nr_in_use = 0;
|
|
static struct mutex ssp_mutex[IMX233_NR_SSP];
|
|
static struct semaphore ssp_sema[IMX233_NR_SSP];
|
|
static struct ssp_dma_command_t ssp_dma_cmd[IMX233_NR_SSP];
|
|
static uint32_t ssp_bus_width[IMX233_NR_SSP];
|
|
static unsigned ssp_log_block_size[IMX233_NR_SSP];
|
|
static ssp_detect_cb_t ssp_detect_cb[IMX233_NR_SSP];
|
|
static bool ssp_detect_invert[IMX233_NR_SSP];
|
|
|
|
void INT_SSP(int ssp)
|
|
{
|
|
/* reset dma channel on error */
|
|
if(imx233_dma_is_channel_error_irq(APB_SSP(ssp)))
|
|
imx233_dma_reset_channel(APB_SSP(ssp));
|
|
/* clear irq flags */
|
|
imx233_dma_clear_channel_interrupt(APB_SSP(ssp));
|
|
semaphore_release(&ssp_sema[ssp - 1]);
|
|
}
|
|
|
|
void INT_SSP1_DMA(void)
|
|
{
|
|
INT_SSP(1);
|
|
}
|
|
|
|
void INT_SSP2_DMA(void)
|
|
{
|
|
INT_SSP(2);
|
|
}
|
|
|
|
void INT_SSP1_ERROR(void)
|
|
{
|
|
panicf("ssp1 error");
|
|
}
|
|
|
|
void INT_SSP2_ERROR(void)
|
|
{
|
|
panicf("ssp2 error");
|
|
}
|
|
|
|
void imx233_ssp_init(void)
|
|
{
|
|
/* power down and init data structures */
|
|
ssp_nr_in_use = 0;
|
|
for(int i = 0; i < IMX233_NR_SSP; i++)
|
|
{
|
|
SSP_SETn(SSP_CTRL0, 1 + i, CLKGATE);
|
|
semaphore_init(&ssp_sema[i], 1, 0);
|
|
mutex_init(&ssp_mutex[i]);
|
|
ssp_bus_width[i] = BV_SSP_CTRL0_BUS_WIDTH__ONE_BIT;
|
|
}
|
|
}
|
|
|
|
void imx233_ssp_start(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
if(ssp_in_use[ssp - 1])
|
|
return;
|
|
ssp_in_use[ssp - 1] = true;
|
|
/* Gate block */
|
|
imx233_reset_block(&SSP_REGn(SSP_CTRL0, ssp));
|
|
/* Gate dma channel */
|
|
imx233_dma_clkgate_channel(APB_SSP(ssp), true);
|
|
/* If first block to start, start SSP clock */
|
|
if(ssp_nr_in_use == 0)
|
|
{
|
|
/** 2.3.1: the clk_ssp maximum frequency is 102.858 MHz */
|
|
/* fracdiv = 18 => clk_io = pll = 480Mhz
|
|
* intdiv = 5 => clk_ssp = 96Mhz */
|
|
imx233_clkctrl_set_fractional_divisor(CLK_IO, 18);
|
|
imx233_clkctrl_enable_clock(CLK_SSP, false);
|
|
imx233_clkctrl_set_clock_divisor(CLK_SSP, 5);
|
|
imx233_clkctrl_set_bypass_pll(CLK_SSP, false); /* use IO */
|
|
imx233_clkctrl_enable_clock(CLK_SSP, true);
|
|
}
|
|
ssp_nr_in_use++;
|
|
}
|
|
|
|
void imx233_ssp_stop(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
if(!ssp_in_use[ssp - 1])
|
|
return;
|
|
ssp_in_use[ssp - 1] = false;
|
|
/* Gate off */
|
|
SSP_SETn(SSP_CTRL0, ssp, CLKGATE);
|
|
/* Gate off dma */
|
|
imx233_dma_clkgate_channel(APB_SSP(ssp), false);
|
|
/* If last block to stop, stop SSP clock */
|
|
ssp_nr_in_use--;
|
|
if(ssp_nr_in_use == 0)
|
|
{
|
|
imx233_clkctrl_enable_clock(CLK_SSP, false);
|
|
imx233_clkctrl_set_fractional_divisor(CLK_IO, 0);
|
|
}
|
|
}
|
|
|
|
void imx233_ssp_softreset(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
imx233_reset_block(&HW_SSP_CTRL0(ssp));
|
|
}
|
|
|
|
void imx233_ssp_set_timings(int ssp, int divide, int rate, int timeout)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
SSP_REGn(SSP_TIMING, ssp) = BF_OR3(SSP_TIMING, CLOCK_DIVIDE(divide),
|
|
CLOCK_RATE(rate), TIMEOUT(timeout));
|
|
}
|
|
|
|
void imx233_ssp_setup_ssp1_sd_mmc_pins(bool enable_pullups, unsigned bus_width,
|
|
unsigned drive_strength, bool use_alt)
|
|
{
|
|
/* SSP_{CMD,SCK} */
|
|
imx233_set_pin_drive_strength(2, 0, drive_strength);
|
|
imx233_set_pin_drive_strength(2, 6, drive_strength);
|
|
imx233_pinctrl_acquire_pin(2, 0, "ssp1 cmd");
|
|
imx233_pinctrl_acquire_pin(2, 6, "ssp1 sck");
|
|
imx233_set_pin_function(2, 0, PINCTRL_FUNCTION_MAIN);
|
|
imx233_set_pin_function(2, 6, PINCTRL_FUNCTION_MAIN);
|
|
imx233_enable_pin_pullup(2, 0, enable_pullups);
|
|
/* SSP_DATA{0-3} */
|
|
for(unsigned i = 0; i < MIN(bus_width, 4); i++)
|
|
{
|
|
imx233_pinctrl_acquire_pin(2, 2 + i, "ssp1 data");
|
|
imx233_set_pin_drive_strength(2, 2 + i, drive_strength);
|
|
imx233_set_pin_function(2, 2 + i, PINCTRL_FUNCTION_MAIN);
|
|
imx233_enable_pin_pullup(2, 2 + i, enable_pullups);
|
|
}
|
|
|
|
/* SSP_DATA{4-7} */
|
|
for(unsigned i = 4; i < bus_width; i++)
|
|
{
|
|
if(use_alt)
|
|
{
|
|
imx233_pinctrl_acquire_pin(0, 22 + i, "ssp1 data");
|
|
imx233_set_pin_drive_strength(0, 22 + i, drive_strength);
|
|
imx233_set_pin_function(0, 22 + i, PINCTRL_FUNCTION_ALT2);
|
|
imx233_enable_pin_pullup(0, 22 + i, enable_pullups);
|
|
}
|
|
else
|
|
{
|
|
imx233_pinctrl_acquire_pin(0, 4 + i, "ssp1 data");
|
|
imx233_set_pin_drive_strength(0, 4 + i, drive_strength);
|
|
imx233_set_pin_function(0, 4 + i, PINCTRL_FUNCTION_ALT2);
|
|
imx233_enable_pin_pullup(0, 4 + i, enable_pullups);
|
|
}
|
|
}
|
|
}
|
|
|
|
void imx233_ssp_setup_ssp2_sd_mmc_pins(bool enable_pullups, unsigned bus_width,
|
|
unsigned drive_strength)
|
|
{
|
|
/* SSP_{CMD,SCK} */
|
|
imx233_pinctrl_acquire_pin(0, 20, "ssp2 cmd");
|
|
imx233_pinctrl_acquire_pin(0, 24, "ssp2 sck");
|
|
imx233_set_pin_drive_strength(0, 20, drive_strength);
|
|
imx233_set_pin_drive_strength(0, 24, drive_strength);
|
|
imx233_set_pin_function(0, 20, PINCTRL_FUNCTION_ALT2);
|
|
imx233_set_pin_function(0, 24, PINCTRL_FUNCTION_ALT2);
|
|
imx233_enable_pin_pullup(0, 20, enable_pullups);
|
|
/* SSP_DATA{0-7}*/
|
|
for(unsigned i = 0; i < bus_width; i++)
|
|
{
|
|
imx233_pinctrl_acquire_pin(0, i, "ssp2 data");
|
|
imx233_set_pin_drive_strength(0, i, drive_strength);
|
|
imx233_set_pin_function(0, i, PINCTRL_FUNCTION_ALT2);
|
|
imx233_enable_pin_pullup(0, i, enable_pullups);
|
|
imx233_enable_gpio_output(0, i, false);
|
|
imx233_set_gpio_output(0, i, false);
|
|
}
|
|
}
|
|
|
|
void imx233_ssp_set_mode(int ssp, unsigned mode)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
/* set mode */
|
|
SSP_WRn(SSP_CTRL1, ssp, SSP_MODE, mode);
|
|
/* set mode specific settings */
|
|
switch(mode)
|
|
{
|
|
case BV_SSP_CTRL1_SSP_MODE__SD_MMC:
|
|
SSP_WRn_V(SSP_CTRL1, ssp, WORD_LENGTH, EIGHT_BITS);
|
|
SSP_SETn(SSP_CTRL1, ssp, POLARITY);
|
|
SSP_SETn(SSP_CTRL1, ssp, DMA_ENABLE);
|
|
break;
|
|
default: return;
|
|
}
|
|
}
|
|
|
|
void imx233_ssp_set_bus_width(int ssp, unsigned width)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
switch(width)
|
|
{
|
|
case 1: ssp_bus_width[ssp - 1] = BV_SSP_CTRL0_BUS_WIDTH__ONE_BIT; break;
|
|
case 4: ssp_bus_width[ssp - 1] = BV_SSP_CTRL0_BUS_WIDTH__FOUR_BIT; break;
|
|
case 8: ssp_bus_width[ssp - 1] = BV_SSP_CTRL0_BUS_WIDTH__EIGHT_BIT; break;
|
|
}
|
|
}
|
|
|
|
void imx233_ssp_set_block_size(int ssp, unsigned log_block_size)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
ssp_log_block_size[ssp - 1] = log_block_size;
|
|
}
|
|
|
|
enum imx233_ssp_error_t imx233_ssp_sd_mmc_transfer(int ssp, uint8_t cmd,
|
|
uint32_t cmd_arg, enum imx233_ssp_resp_t resp, void *buffer, unsigned block_count,
|
|
bool wait4irq, bool read, uint32_t *resp_ptr)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
mutex_lock(&ssp_mutex[ssp - 1]);
|
|
/* Enable all interrupts */
|
|
imx233_icoll_enable_interrupt(INT_SRC_SSP_DMA(ssp), true);
|
|
imx233_dma_enable_channel_interrupt(APB_SSP(ssp), true);
|
|
|
|
unsigned xfer_size = block_count * (1 << ssp_log_block_size[ssp - 1]);
|
|
|
|
ssp_dma_cmd[ssp - 1].cmd0 = BF_OR4(SSP_CMD0, CMD(cmd), APPEND_8CYC(1),
|
|
BLOCK_SIZE(ssp_log_block_size[ssp - 1]), BLOCK_COUNT(block_count - 1));
|
|
ssp_dma_cmd[ssp - 1].cmd1 = cmd_arg;
|
|
/* setup all flags and run */
|
|
ssp_dma_cmd[ssp - 1].ctrl0 = BF_OR9(SSP_CTRL0, XFER_COUNT(xfer_size),
|
|
ENABLE(1), IGNORE_CRC(buffer == NULL), WAIT_FOR_IRQ(wait4irq),
|
|
GET_RESP(resp != SSP_NO_RESP), LONG_RESP(resp == SSP_LONG_RESP),
|
|
BUS_WIDTH(ssp_bus_width[ssp - 1]), DATA_XFER(buffer != NULL),
|
|
READ(read));
|
|
/* setup the dma parameters */
|
|
ssp_dma_cmd[ssp - 1].dma.buffer = buffer;
|
|
ssp_dma_cmd[ssp - 1].dma.next = NULL;
|
|
ssp_dma_cmd[ssp - 1].dma.cmd =
|
|
(buffer == NULL ? HW_APB_CHx_CMD__COMMAND__NO_XFER :
|
|
read ? HW_APB_CHx_CMD__COMMAND__WRITE : HW_APB_CHx_CMD__COMMAND__READ) |
|
|
HW_APB_CHx_CMD__IRQONCMPLT | HW_APB_CHx_CMD__SEMAPHORE |
|
|
HW_APB_CHx_CMD__WAIT4ENDCMD |
|
|
(3 << HW_APB_CHx_CMD__CMDWORDS_BP) |
|
|
(xfer_size << HW_APB_CHx_CMD__XFER_COUNT_BP);
|
|
|
|
SSP_CLRn(SSP_CTRL1, ssp, ALL_IRQ);
|
|
|
|
imx233_dma_reset_channel(APB_SSP(ssp));
|
|
imx233_dma_start_command(APB_SSP(ssp), &ssp_dma_cmd[ssp - 1].dma);
|
|
|
|
/* the SSP hardware already has a timeout but we never know; 1 sec is a maximum
|
|
* for all operations */
|
|
enum imx233_ssp_error_t ret;
|
|
|
|
if(semaphore_wait(&ssp_sema[ssp - 1], HZ) == OBJ_WAIT_TIMEDOUT)
|
|
{
|
|
imx233_dma_reset_channel(APB_SSP(ssp));
|
|
ret = SSP_TIMEOUT;
|
|
}
|
|
else if((SSP_REGn(SSP_CTRL1, ssp) & BM_SSP_CTRL1_ALL_IRQ) == 0)
|
|
ret = SSP_SUCCESS;
|
|
else if((SSP_REGn(SSP_CTRL1, ssp) & BM_SSP_CTRL1_TIMEOUT_IRQ))
|
|
ret = SSP_TIMEOUT;
|
|
else
|
|
ret = SSP_ERROR;
|
|
|
|
if(resp_ptr != NULL)
|
|
{
|
|
if(resp != SSP_NO_RESP)
|
|
*resp_ptr++ = SSP_REGn(SSP_SDRESP0, ssp);
|
|
if(resp == SSP_LONG_RESP)
|
|
{
|
|
*resp_ptr++ = SSP_REGn(SSP_SDRESP1, ssp);
|
|
*resp_ptr++ = SSP_REGn(SSP_SDRESP2, ssp);
|
|
*resp_ptr++ = SSP_REGn(SSP_SDRESP3, ssp);
|
|
}
|
|
}
|
|
mutex_unlock(&ssp_mutex[ssp - 1]);
|
|
return ret;
|
|
}
|
|
|
|
void imx233_ssp_sd_mmc_power_up_sequence(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
SSP_CLRn(SSP_CMD0, ssp, SLOW_CLKING_EN);
|
|
SSP_SETn(SSP_CMD0, ssp, CONT_CLKING_EN);
|
|
mdelay(1);
|
|
SSP_CLRn(SSP_CMD0, ssp, CONT_CLKING_EN);
|
|
}
|
|
|
|
static int ssp_detect_oneshot_callback(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
if(ssp_detect_cb[ssp - 1])
|
|
ssp_detect_cb[ssp - 1](ssp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ssp1_detect_oneshot_callback(struct timeout *tmo)
|
|
{
|
|
(void) tmo;
|
|
return ssp_detect_oneshot_callback(1);
|
|
}
|
|
|
|
static int ssp2_detect_oneshot_callback(struct timeout *tmo)
|
|
{
|
|
(void) tmo;
|
|
return ssp_detect_oneshot_callback(2);
|
|
}
|
|
|
|
static void detect_irq(int bank, int pin)
|
|
{
|
|
static struct timeout ssp1_detect_oneshot;
|
|
static struct timeout ssp2_detect_oneshot;
|
|
if(bank == 2 && pin == 1)
|
|
timeout_register(&ssp1_detect_oneshot, ssp1_detect_oneshot_callback, (3*HZ/10), 0);
|
|
else if(bank == 0 && pin == 19)
|
|
timeout_register(&ssp2_detect_oneshot, ssp2_detect_oneshot_callback, (3*HZ/10), 0);
|
|
}
|
|
|
|
void imx233_ssp_sdmmc_setup_detect(int ssp, bool enable, ssp_detect_cb_t fn,
|
|
bool first_time, bool invert)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
int bank = ssp == 1 ? 2 : 0;
|
|
int pin = ssp == 1 ? 1 : 19;
|
|
ssp_detect_cb[ssp - 1] = fn;
|
|
ssp_detect_invert[ssp - 1] = invert;
|
|
if(enable)
|
|
{
|
|
imx233_pinctrl_acquire_pin(bank, pin, ssp == 1 ? "ssp1 detect" : "ssp2 detect");
|
|
imx233_set_pin_function(bank, pin, PINCTRL_FUNCTION_GPIO);
|
|
imx233_enable_gpio_output(bank, pin, false);
|
|
}
|
|
if(first_time && imx233_ssp_sdmmc_detect(ssp))
|
|
detect_irq(bank, pin);
|
|
imx233_setup_pin_irq(bank, pin, enable, true, !imx233_ssp_sdmmc_detect_raw(ssp), detect_irq);
|
|
}
|
|
|
|
bool imx233_ssp_sdmmc_is_detect_inverted(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
return ssp_detect_invert[ssp - 1];
|
|
}
|
|
|
|
bool imx233_ssp_sdmmc_detect_raw(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
return SSP_RDn(SSP_STATUS, ssp, CARD_DETECT);
|
|
}
|
|
|
|
bool imx233_ssp_sdmmc_detect(int ssp)
|
|
{
|
|
ASSERT_SSP(ssp)
|
|
return imx233_ssp_sdmmc_detect_raw(ssp) != ssp_detect_invert[ssp - 1];
|
|
}
|