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spi: sh-msiof: Move clock management to (un)prepare_message() 

Move clock management and pin configuration from the bitbang chipselect()
method to the SPI core prepare_message() and unprepare_message() methods.

As spi_master.{,un}prepare_message() is guaranteed to be called in
matching pairs, the clock management synchronization is no longer needed.

As sh_msiof_spi_set_pin_regs() is no longer called at spi_master.setup()
time (through spi_bitbang_setup() and the spi_bitbang.chipselect()
callback), we now have to take care of that ourselves.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-02-25 11:21:11 +01:00 committed by Mark Brown
parent beb74bb087
commit c833ff7304
1 changed files with 38 additions and 23 deletions
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61
drivers/spi/spi-sh-msiof.c
View File

@ -46,7 +46,6 @@ struct sh_msiof_spi_priv {
const struct sh_msiof_chipdata *chipdata;
struct sh_msiof_spi_info *info;
struct completion done;
unsigned long flags;
int tx_fifo_size;
int rx_fifo_size;
};
@ -459,6 +458,7 @@ static int sh_msiof_spi_setup_transfer(struct spi_device *spi,
static int sh_msiof_spi_setup(struct spi_device *spi)
{
struct device_node *np = spi->master->dev.of_node;
struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
if (!np) {
/*
@ -468,12 +468,46 @@ static int sh_msiof_spi_setup(struct spi_device *spi)
spi->cs_gpio = (uintptr_t)spi->controller_data;
}
/* Configure pins before deasserting CS */
sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
!!(spi->mode & SPI_CPHA),
!!(spi->mode & SPI_3WIRE),
!!(spi->mode & SPI_LSB_FIRST),
!!(spi->mode & SPI_CS_HIGH));
return spi_bitbang_setup(spi);
}
static int sh_msiof_prepare_message(struct spi_master *master,
struct spi_message *msg)
{
struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
const struct spi_device *spi = msg->spi;
pm_runtime_get_sync(&p->pdev->dev);
clk_enable(p->clk);
/* Configure pins before asserting CS */
sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
!!(spi->mode & SPI_CPHA),
!!(spi->mode & SPI_3WIRE),
!!(spi->mode & SPI_LSB_FIRST),
!!(spi->mode & SPI_CS_HIGH));
return 0;
}
static int sh_msiof_unprepare_message(struct spi_master *master,
struct spi_message *msg)
{
struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
clk_disable(p->clk);
pm_runtime_put(&p->pdev->dev);
return 0;
}
static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on)
{
struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
int value;
/* chip select is active low unless SPI_CS_HIGH is set */
@ -482,29 +516,8 @@ static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on)
else
value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1;
if (is_on == BITBANG_CS_ACTIVE) {
if (!test_and_set_bit(0, &p->flags)) {
pm_runtime_get_sync(&p->pdev->dev);
clk_enable(p->clk);
}
/* Configure pins before asserting CS */
sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
!!(spi->mode & SPI_CPHA),
!!(spi->mode & SPI_3WIRE),
!!(spi->mode & SPI_LSB_FIRST),
!!(spi->mode & SPI_CS_HIGH));
}
if (spi->cs_gpio >= 0)
gpio_set_value(spi->cs_gpio, value);
if (is_on == BITBANG_CS_INACTIVE) {
if (test_and_clear_bit(0, &p->flags)) {
clk_disable(p->clk);
pm_runtime_put(&p->pdev->dev);
}
}
}
static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
@ -811,6 +824,8 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
master->num_chipselect = p->info->num_chipselect;
master->setup = sh_msiof_spi_setup;
master->cleanup = spi_bitbang_cleanup;
master->prepare_message = sh_msiof_prepare_message;
master->unprepare_message = sh_msiof_unprepare_message;
p->bitbang.master = master;
p->bitbang.chipselect = sh_msiof_spi_chipselect;