/* MX21, MX27 */
static unsigned int spi_imx_clkdiv_1(unsigned int fin,
- unsigned int fspi, unsigned int max)
+ unsigned int fspi, unsigned int max, unsigned int *fres)
{
int i;
for (i = 2; i < max; i++)
if (fspi * mxc_clkdivs[i] >= fin)
- return i;
+ break;
- return max;
+ *fres = fin / mxc_clkdivs[i];
+ return i;
}
/* MX1, MX31, MX35, MX51 CSPI */
#define MX31_CSPICTRL_ENABLE (1 << 0)
#define MX31_CSPICTRL_MASTER (1 << 1)
#define MX31_CSPICTRL_XCH (1 << 2)
+#define MX31_CSPICTRL_SMC (1 << 3)
#define MX31_CSPICTRL_POL (1 << 4)
#define MX31_CSPICTRL_PHA (1 << 5)
#define MX31_CSPICTRL_SSCTL (1 << 6)
#define MX35_CSPICTRL_CS_SHIFT 12
#define MX31_CSPICTRL_DR_SHIFT 16
+#define MX31_CSPI_DMAREG 0x10
+#define MX31_DMAREG_RH_DEN (1<<4)
+#define MX31_DMAREG_TH_DEN (1<<1)
+
#define MX31_CSPISTATUS 0x14
#define MX31_STATUS_RR (1 << 3)
(is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
MX31_CSPICTRL_CS_SHIFT);
+ if (spi_imx->usedma)
+ reg |= MX31_CSPICTRL_SMC;
+
writel(reg, spi_imx->base + MXC_CSPICTRL);
reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
reg &= ~MX31_TEST_LBC;
writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
+ if (spi_imx->usedma) {
+ /* configure DMA requests when RXFIFO is half full and
+ when TXFIFO is half empty */
+ writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
+ spi_imx->base + MX31_CSPI_DMAREG);
+ }
+
return 0;
}
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
+ unsigned int clk;
+
+ reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max, &clk)
+ << MX21_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
- reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
- MX21_CSPICTRL_DR_SHIFT;
reg |= config->bpw - 1;
if (spi->mode & SPI_CPHA)
spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
/*
- * Only validated on i.mx6 now, can remove the constrain if validated on
- * other chips.
+ * Only validated on i.mx35 and i.mx6 now, can remove the constraint
+ * if validated on other chips.
*/
- if (is_imx51_ecspi(spi_imx)) {
+ if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx)) {
ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
if (ret == -EPROBE_DEFER)
goto out_clk_put;