[U-Boot] [PATCH V2 07/11] SPI: mxc_spi: add support for i.MX35 processor

Stefano Babic
2011-01-20T08:46:30Z

Signed-off-by: Stefano Babic <sbabic@denx.de>
---
drivers/spi/mxc_spi.c | 96 ++++++++++++++++++++++++++++++++++++------------
1 files changed, 72 insertions(+), 24 deletions(-)

diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index d558137..5670714 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -70,6 +70,8 @@ static unsigned long spi_bases[] = {
0x53f84000,
};

+#define mxc_get_clock(x) mx31_get_ipg_clk()
+
#elif defined(CONFIG_MX51)
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
@@ -111,6 +113,45 @@ static unsigned long spi_bases[] = {
CSPI2_BASE_ADDR,
CSPI3_BASE_ADDR,
};
+
+#elif defined(CONFIG_MX35)
+
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+
+#define MXC_CSPIRXDATA 0x00
+#define MXC_CSPITXDATA 0x04
+#define MXC_CSPICTRL 0x08
+#define MXC_CSPIINT 0x0C
+#define MXC_CSPIDMA 0x10
+#define MXC_CSPISTAT 0x14
+#define MXC_CSPIPERIOD 0x18
+#define MXC_CSPITEST 0x1C
+#define MXC_CSPIRESET 0x00
+
+#define MXC_CSPICTRL_EN (1 << 0)
+#define MXC_CSPICTRL_MODE (1 << 1)
+#define MXC_CSPICTRL_XCH (1 << 2)
+#define MXC_CSPICTRL_SMC (1 << 3)
+#define MXC_CSPICTRL_POL (1 << 4)
+#define MXC_CSPICTRL_PHA (1 << 5)
+#define MXC_CSPICTRL_SSCTL (1 << 6)
+#define MXC_CSPICTRL_SSPOL (1 << 7)
+#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12)
+#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20)
+#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16)
+#define MXC_CSPICTRL_TC (1 << 7)
+#define MXC_CSPICTRL_RXOVF (1 << 6)
+#define MXC_CSPICTRL_MAXBITS 0xfff
+
+#define MXC_CSPIPERIOD_32KHZ (1 << 15)
+#define MAX_SPI_BYTES 4
+
+static unsigned long spi_bases[] = {
+ 0x43fa4000,
+ 0x50010000,
+};
+
#else
#error "Unsupported architecture"
#endif
@@ -158,8 +199,35 @@ void spi_cs_deactivate(struct spi_slave *slave)
!(mxcs->ss_pol));
}

-#ifdef CONFIG_MX51
-static s32 spi_cfg(struct mxc_spi_slave *mxcs, unsigned int cs,
+#if defined(CONFIG_MX31) || defined(CONFIG_MX35)
+static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ unsigned int ctrl_reg;
+
+ ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) |
+ MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS) |
+ MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */
+ MXC_CSPICTRL_EN |
+#ifdef CONFIG_MX35
+ MXC_CSPICTRL_SSCTL |
+#endif
+ MXC_CSPICTRL_MODE;
+
+ if (mode & SPI_CPHA)
+ ctrl_reg |= MXC_CSPICTRL_PHA;
+ if (mode & SPI_CPOL)
+ ctrl_reg |= MXC_CSPICTRL_POL;
+ if (mode & SPI_CS_HIGH)
+ ctrl_reg |= MXC_CSPICTRL_SSPOL;
+ mxcs->ctrl_reg = ctrl_reg;
+
+ return 0;
+}
+#endif
+
+#if defined(CONFIG_MX51)
+static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
u32 clk_src = mxc_get_clock(MXC_CSPI_CLK);
@@ -227,7 +295,7 @@ static s32 spi_cfg(struct mxc_spi_slave *mxcs, unsigned int cs,

/*
* Configuration register setup
- * The MX51 has support different setup for each SS
+ * The MX51 supports different setup for each SS
*/
reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_SSPOL))) |
(ss_pol << (cs + MXC_CSPICON_SSPOL));
@@ -363,7 +431,6 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,

}

-
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
@@ -441,7 +508,6 @@ static int decode_cs(struct mxc_spi_slave *mxcs, unsigned int cs)
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
- unsigned int ctrl_reg;
struct mxc_spi_slave *mxcs;
int ret;

@@ -467,30 +533,12 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
mxcs->base = spi_bases[bus];
mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0;

-#ifdef CONFIG_MX51
- /* Can be used for i.MX31 too ? */
- ctrl_reg = 0;
- ret = spi_cfg(mxcs, cs, max_hz, mode);
+ ret = spi_cfg_mxc(mxcs, cs, max_hz, mode);
if (ret) {
printf("mxc_spi: cannot setup SPI controller\n");
free(mxcs);
return NULL;
}
-#else
- ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) |
- MXC_CSPICTRL_BITCOUNT(31) |
- MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */
- MXC_CSPICTRL_EN |
- MXC_CSPICTRL_MODE;
-
- if (mode & SPI_CPHA)
- ctrl_reg |= MXC_CSPICTRL_PHA;
- if (mode & SPI_CPOL)
- ctrl_reg |= MXC_CSPICTRL_POL;
- if (mode & SPI_CS_HIGH)
- ctrl_reg |= MXC_CSPICTRL_SSPOL;
- mxcs->ctrl_reg = ctrl_reg;
-#endif
return &mxcs->slave;
}

--
1.7.1