#include <spi.h>
#include <asm/errno.h>
#include <asm/io.h>
-#include <mxc_gpio.h>
+#include <asm/gpio.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
#ifdef CONFIG_MX27
/* i.MX27 has a completely wrong register layout and register definitions in the
* datasheet, the correct one is in the Freescale's Linux driver */
-#error "i.MX27 CSPI not supported due to drastic differences in register definisions" \
+#error "i.MX27 CSPI not supported due to drastic differences in register definitions" \
"See linux mxc_spi driver from Freescale for details."
-
-#elif defined(CONFIG_MX31)
-
-#include <asm/arch/mx31.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) << 24)
-#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0x1f) << 8)
-#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16)
-#define MXC_CSPICTRL_TC (1 << 8)
-#define MXC_CSPICTRL_RXOVF (1 << 6)
-#define MXC_CSPICTRL_MAXBITS 0x1f
-
-#define MXC_CSPIPERIOD_32KHZ (1 << 15)
-#define MAX_SPI_BYTES 4
-
-static unsigned long spi_bases[] = {
- 0x43fa4000,
- 0x50010000,
- 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>
-
-#define MXC_CSPIRXDATA 0x00
-#define MXC_CSPITXDATA 0x04
-#define MXC_CSPICTRL 0x08
-#define MXC_CSPICON 0x0C
-#define MXC_CSPIINT 0x10
-#define MXC_CSPIDMA 0x14
-#define MXC_CSPISTAT 0x18
-#define MXC_CSPIPERIOD 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_CHIPSELECT(x) (((x) & 0x3) << 12)
-#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20)
-#define MXC_CSPICTRL_PREDIV(x) (((x) & 0xF) << 12)
-#define MXC_CSPICTRL_POSTDIV(x) (((x) & 0xF) << 8)
-#define MXC_CSPICTRL_SELCHAN(x) (((x) & 0x3) << 18)
-#define MXC_CSPICTRL_MAXBITS 0xfff
-#define MXC_CSPICTRL_TC (1 << 7)
-#define MXC_CSPICTRL_RXOVF (1 << 6)
-
-#define MXC_CSPIPERIOD_32KHZ (1 << 15)
-#define MAX_SPI_BYTES 32
-
-/* Bit position inside CTRL register to be associated with SS */
-#define MXC_CSPICTRL_CHAN 18
-
-/* Bit position inside CON register to be associated with SS */
-#define MXC_CSPICON_POL 4
-#define MXC_CSPICON_PHA 0
-#define MXC_CSPICON_SSPOL 12
-
-static unsigned long spi_bases[] = {
- CSPI1_BASE_ADDR,
- 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
+#endif
static unsigned long spi_bases[] = {
- 0x43fa4000,
- 0x50010000,
+ MXC_SPI_BASE_ADDRESSES
};
-#else
-#error "Unsupported architecture"
-#endif
-
#define OUT MXC_GPIO_DIRECTION_OUT
+#define reg_read readl
+#define reg_write(a, v) writel(v, a)
+
struct mxc_spi_slave {
struct spi_slave slave;
unsigned long base;
u32 ctrl_reg;
-#if defined(CONFIG_MX51)
+#if defined(MXC_ECSPI)
u32 cfg_reg;
#endif
int gpio;
return container_of(slave, struct mxc_spi_slave, slave);
}
-static inline u32 reg_read(unsigned long addr)
-{
- return *(volatile unsigned long*)addr;
-}
-
-static inline void reg_write(unsigned long addr, u32 val)
-{
- *(volatile unsigned long*)addr = val;
-}
-
void spi_cs_activate(struct spi_slave *slave)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
if (mxcs->gpio > 0)
- mxc_gpio_set(mxcs->gpio, mxcs->ss_pol);
+ gpio_set_value(mxcs->gpio, mxcs->ss_pol);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
if (mxcs->gpio > 0)
- mxc_gpio_set(mxcs->gpio,
+ gpio_set_value(mxcs->gpio,
!(mxcs->ss_pol));
}
-#if defined(CONFIG_MX31) || defined(CONFIG_MX35)
+u32 get_cspi_div(u32 div)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ if (div <= (4 << i))
+ return i;
+ }
+ return i;
+}
+
+#ifdef MXC_CSPI
static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
unsigned int ctrl_reg;
+ u32 clk_src;
+ u32 div;
+
+ clk_src = mxc_get_clock(MXC_CSPI_CLK);
+
+ div = DIV_ROUND_UP(clk_src, max_hz);
+ div = get_cspi_div(div);
+
+ debug("clk %d Hz, div %d, real clk %d Hz\n",
+ max_hz, div, clk_src / (4 << div));
ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) |
MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS) |
- MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */
+ MXC_CSPICTRL_DATARATE(div) |
MXC_CSPICTRL_EN |
#ifdef CONFIG_MX35
MXC_CSPICTRL_SSCTL |
}
#endif
-#if defined(CONFIG_MX51)
+#ifdef MXC_ECSPI
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);
s32 pre_div = 0, post_div = 0, i, reg_ctrl, reg_config;
u32 ss_pol = 0, sclkpol = 0, sclkpha = 0;
+ struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
if (max_hz == 0) {
printf("Error: desired clock is 0\n");
return -1;
}
- reg_ctrl = reg_read(mxcs->base + MXC_CSPICTRL);
-
- /* Reset spi */
- reg_write(mxcs->base + MXC_CSPICTRL, 0);
- reg_write(mxcs->base + MXC_CSPICTRL, (reg_ctrl | 0x1));
+ /*
+ * Reset SPI and set all CSs to master mode, if toggling
+ * between slave and master mode we might see a glitch
+ * on the clock line
+ */
+ reg_ctrl = MXC_CSPICTRL_MODE_MASK;
+ reg_write(®s->ctrl, reg_ctrl);
+ reg_ctrl |= MXC_CSPICTRL_EN;
+ reg_write(®s->ctrl, reg_ctrl);
/*
* The following computation is taken directly from Freescale's code.
*/
if (clk_src > max_hz) {
- pre_div = clk_src / max_hz;
+ pre_div = DIV_ROUND_UP(clk_src, max_hz);
if (pre_div > 16) {
post_div = pre_div / 16;
pre_div = 15;
reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_POSTDIV(0x0F)) |
MXC_CSPICTRL_POSTDIV(post_div);
- /* always set to master mode */
- reg_ctrl |= 1 << (cs + 4);
-
/* We need to disable SPI before changing registers */
reg_ctrl &= ~MXC_CSPICTRL_EN;
if (mode & SPI_CPHA)
sclkpha = 1;
- reg_config = reg_read(mxcs->base + MXC_CSPICON);
+ reg_config = reg_read(®s->cfg);
/*
* Configuration register setup
(sclkpha << (cs + MXC_CSPICON_PHA));
debug("reg_ctrl = 0x%x\n", reg_ctrl);
- reg_write(mxcs->base + MXC_CSPICTRL, reg_ctrl);
+ reg_write(®s->ctrl, reg_ctrl);
debug("reg_config = 0x%x\n", reg_config);
- reg_write(mxcs->base + MXC_CSPICON, reg_config);
+ reg_write(®s->cfg, reg_config);
/* save config register and control register */
mxcs->ctrl_reg = reg_ctrl;
mxcs->cfg_reg = reg_config;
/* clear interrupt reg */
- reg_write(mxcs->base + MXC_CSPIINT, 0);
- reg_write(mxcs->base + MXC_CSPISTAT,
- MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
+ reg_write(®s->intr, 0);
+ reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
return 0;
}
const u8 *dout, u8 *din, unsigned long flags)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
- int nbytes = (bitlen + 7) / 8;
+ int nbytes = DIV_ROUND_UP(bitlen, 8);
u32 data, cnt, i;
+ struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
debug("%s: bitlen %d dout 0x%x din 0x%x\n",
__func__, bitlen, (u32)dout, (u32)din);
~MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS)) |
MXC_CSPICTRL_BITCOUNT(bitlen - 1);
- reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg | MXC_CSPICTRL_EN);
-#ifdef CONFIG_MX51
- reg_write(mxcs->base + MXC_CSPICON, mxcs->cfg_reg);
+ reg_write(®s->ctrl, mxcs->ctrl_reg | MXC_CSPICTRL_EN);
+#ifdef MXC_ECSPI
+ reg_write(®s->cfg, mxcs->cfg_reg);
#endif
/* Clear interrupt register */
- reg_write(mxcs->base + MXC_CSPISTAT,
- MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
+ reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
/*
* The SPI controller works only with words,
}
debug("Sending SPI 0x%x\n", data);
- reg_write(mxcs->base + MXC_CSPITXDATA, data);
+ reg_write(®s->txdata, data);
nbytes -= cnt;
}
dout += 4;
}
debug("Sending SPI 0x%x\n", data);
- reg_write(mxcs->base + MXC_CSPITXDATA, data);
+ reg_write(®s->txdata, data);
nbytes -= 4;
}
/* FIFO is written, now starts the transfer setting the XCH bit */
- reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg |
+ reg_write(®s->ctrl, mxcs->ctrl_reg |
MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH);
/* Wait until the TC (Transfer completed) bit is set */
- while ((reg_read(mxcs->base + MXC_CSPISTAT) & MXC_CSPICTRL_TC) == 0)
+ while ((reg_read(®s->stat) & MXC_CSPICTRL_TC) == 0)
;
/* Transfer completed, clear any pending request */
- reg_write(mxcs->base + MXC_CSPISTAT,
- MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
+ reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
- nbytes = (bitlen + 7) / 8;
+ nbytes = DIV_ROUND_UP(bitlen, 8);
cnt = nbytes % 32;
if (bitlen % 32) {
- data = reg_read(mxcs->base + MXC_CSPIRXDATA);
+ data = reg_read(®s->rxdata);
cnt = (bitlen % 32) / 8;
data = cpu_to_be32(data) >> ((sizeof(data) - cnt) * 8);
debug("SPI Rx unaligned: 0x%x\n", data);
while (nbytes > 0) {
u32 tmp;
- tmp = reg_read(mxcs->base + MXC_CSPIRXDATA);
+ tmp = reg_read(®s->rxdata);
data = cpu_to_be32(tmp);
debug("SPI Rx: 0x%x 0x%x\n", tmp, data);
cnt = min(nbytes, sizeof(data));
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
- int n_bytes = (bitlen + 7) / 8;
+ int n_bytes = DIV_ROUND_UP(bitlen, 8);
int n_bits;
int ret;
u32 blk_size;
spi_cs_activate(slave);
while (n_bytes > 0) {
-
if (n_bytes < MAX_SPI_BYTES)
blk_size = n_bytes;
else
if (cs > 3) {
mxcs->gpio = cs >> 8;
cs &= 3;
- ret = mxc_gpio_direction(mxcs->gpio, OUT);
+ ret = gpio_direction_output(mxcs->gpio, !(mxcs->ss_pol));
if (ret) {
printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio);
return -EINVAL;
if (bus >= ARRAY_SIZE(spi_bases))
return NULL;
- mxcs = malloc(sizeof(struct mxc_spi_slave));
+ mxcs = spi_alloc_slave(struct mxc_spi_slave, bus, cs);
if (!mxcs) {
puts("mxc_spi: SPI Slave not allocated !\n");
return NULL;
}
+ mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0;
+
ret = decode_cs(mxcs, cs);
if (ret < 0) {
free(mxcs);
cs = ret;
- mxcs->slave.bus = bus;
- mxcs->slave.cs = cs;
mxcs->base = spi_bases[bus];
- mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0;
ret = spi_cfg_mxc(mxcs, cs, max_hz, mode);
if (ret) {
int spi_claim_bus(struct spi_slave *slave)
{
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
+ struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
- reg_write(mxcs->base + MXC_CSPIRESET, 1);
+ reg_write(®s->rxdata, 1);
udelay(1);
- reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg);
- reg_write(mxcs->base + MXC_CSPIPERIOD,
- MXC_CSPIPERIOD_32KHZ);
- reg_write(mxcs->base + MXC_CSPIINT, 0);
+ reg_write(®s->ctrl, mxcs->ctrl_reg);
+ reg_write(®s->period, MXC_CSPIPERIOD_32KHZ);
+ reg_write(®s->intr, 0);
return 0;
}