diff options
Diffstat (limited to 'drivers/spi/spi-pxa2xx.c')
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index a241891355db..304cf6eb50e6 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/gpio.h> #include <linux/slab.h> +#include <linux/clk.h> #include <asm/io.h> #include <asm/irq.h> @@ -114,6 +115,9 @@ struct driver_data { u32 clear_sr; u32 mask_sr; + /* Maximun clock rate */ + unsigned long max_clk_rate; + /* Message Transfer pump */ struct tasklet_struct pump_transfers; @@ -891,9 +895,12 @@ static int set_dma_burst_and_threshold(struct chip_data *chip, return retval; } -static unsigned int ssp_get_clk_div(struct ssp_device *ssp, int rate) +static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate) { - unsigned long ssp_clk = clk_get_rate(ssp->clk); + unsigned long ssp_clk = drv_data->max_clk_rate; + const struct ssp_device *ssp = drv_data->ssp; + + rate = min_t(int, ssp_clk, rate); if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP) return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8; @@ -908,7 +915,6 @@ static void pump_transfers(unsigned long data) struct spi_transfer *transfer = NULL; struct spi_transfer *previous = NULL; struct chip_data *chip = NULL; - struct ssp_device *ssp = drv_data->ssp; void __iomem *reg = drv_data->ioaddr; u32 clk_div = 0; u8 bits = 0; @@ -1005,7 +1011,7 @@ static void pump_transfers(unsigned long data) if (transfer->bits_per_word) bits = transfer->bits_per_word; - clk_div = ssp_get_clk_div(ssp, speed); + clk_div = ssp_get_clk_div(drv_data, speed); if (bits <= 8) { drv_data->n_bytes = 1; @@ -1214,7 +1220,6 @@ static int setup(struct spi_device *spi) struct pxa2xx_spi_chip *chip_info = NULL; struct chip_data *chip; struct driver_data *drv_data = spi_master_get_devdata(spi->master); - struct ssp_device *ssp = drv_data->ssp; unsigned int clk_div; uint tx_thres = TX_THRESH_DFLT; uint rx_thres = RX_THRESH_DFLT; @@ -1296,7 +1301,7 @@ static int setup(struct spi_device *spi) } } - clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz); + clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz); chip->speed_hz = spi->max_speed_hz; chip->cr0 = clk_div @@ -1312,12 +1317,12 @@ static int setup(struct spi_device *spi) /* NOTE: PXA25x_SSP _could_ use external clocking ... */ if (!pxa25x_ssp_comp(drv_data)) dev_dbg(&spi->dev, "%ld Hz actual, %s\n", - clk_get_rate(ssp->clk) + drv_data->max_clk_rate / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)), chip->enable_dma ? "DMA" : "PIO"); else dev_dbg(&spi->dev, "%ld Hz actual, %s\n", - clk_get_rate(ssp->clk) / 2 + drv_data->max_clk_rate / 2 / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)), chip->enable_dma ? "DMA" : "PIO"); @@ -1470,7 +1475,9 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) } /* Enable SOC clock */ - clk_enable(ssp->clk); + clk_prepare_enable(ssp->clk); + + drv_data->max_clk_rate = clk_get_rate(ssp->clk); /* Load default SSP configuration */ write_SSCR0(0, drv_data->ioaddr); @@ -1499,7 +1506,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) return status; out_error_clock_enabled: - clk_disable(ssp->clk); + clk_disable_unprepare(ssp->clk); out_error_dma_alloc: if (drv_data->tx_channel != -1) @@ -1527,7 +1534,7 @@ static int pxa2xx_spi_remove(struct platform_device *pdev) /* Disable the SSP at the peripheral and SOC level */ write_SSCR0(0, drv_data->ioaddr); - clk_disable(ssp->clk); + clk_disable_unprepare(ssp->clk); /* Release DMA */ if (drv_data->master_info->enable_dma) { @@ -1571,7 +1578,7 @@ static int pxa2xx_spi_suspend(struct device *dev) if (status != 0) return status; write_SSCR0(0, drv_data->ioaddr); - clk_disable(ssp->clk); + clk_disable_unprepare(ssp->clk); return 0; } @@ -1590,7 +1597,7 @@ static int pxa2xx_spi_resume(struct device *dev) DRCMR_MAPVLD | drv_data->tx_channel; /* Enable the SSP clock */ - clk_enable(ssp->clk); + clk_prepare_enable(ssp->clk); /* Start the queue running */ status = spi_master_resume(drv_data->master); |