#include <common.h>
+DECLARE_GLOBAL_DATA_PTR;
+
#ifdef CONFIG_HARD_I2C
#include <mpc5xxx.h>
#include <i2c.h>
-#ifdef CFG_I2C_MODULE
+#if (CONFIG_SYS_I2C_MODULE == 2)
#define I2C_BASE MPC5XXX_I2C2
-#else
+#elif (CONFIG_SYS_I2C_MODULE == 1)
#define I2C_BASE MPC5XXX_I2C1
+#else
+#error CONFIG_SYS_I2C_MODULE is not properly configured
#endif
-#define I2C_TIMEOUT 100
+#define I2C_TIMEOUT 6667
#define I2C_RETRIES 3
+struct mpc5xxx_i2c_tap {
+ int scl2tap;
+ int tap2tap;
+};
+
static int mpc_reg_in (volatile u32 *reg);
static void mpc_reg_out (volatile u32 *reg, int val, int mask);
static int wait_for_bb (void);
static int do_address (uchar chip, char rdwr_flag);
static int send_bytes (uchar chip, char *buf, int len);
static int receive_bytes (uchar chip, char *buf, int len);
+static int mpc_get_fdr (int);
static int mpc_reg_in(volatile u32 *reg)
{
- return *reg >> 24;
+ int ret = *reg >> 24;
__asm__ __volatile__ ("eieio");
+ return ret;
}
static void mpc_reg_out(volatile u32 *reg, int val, int mask)
mpc_reg_out(®s->mcr, 0, 0);
mpc_reg_out(®s->mcr, I2C_EN, 0);
#endif
- udelay(1000);
+ udelay(15);
status = mpc_reg_in(®s->msr);
}
*status = mpc_reg_in(®s->msr);
while (timeout-- && !(*status & I2C_IF)) {
- udelay(1000);
+ udelay(15);
*status = mpc_reg_in(®s->msr);
}
mpc_reg_out(®s->mcr, I2C_TX, I2C_TX);
mpc_reg_out(®s->mdr, chip, 0);
- if (wait_for_pin(&status)) {
- return -2;
- }
+ if (wait_for_pin(&status)) {
+ return -2;
+ }
- if (status & I2C_RXAK) {
- return -3;
- }
+ if (status & I2C_RXAK) {
+ return -3;
+ }
return 0;
}
return 0;
}
+#if defined(CONFIG_SYS_I2C_INIT_MPC5XXX)
+
+#define FDR510(x) (u8) (((x & 0x20) >> 3) | (x & 0x3))
+#define FDR432(x) (u8) ((x & 0x1C) >> 2)
+/*
+ * Reset any i2c devices that may have been interrupted during a system reset.
+ * Normally this would be accomplished by clocking the line until SCL and SDA
+ * are released and then sending a start condtiion (From an Atmel datasheet).
+ * There is no direct access to the i2c pins so instead create start commands
+ * through the i2c interface. Send a start command then delay for the SDA Hold
+ * time, repeat this by disabling/enabling the bus a total of 9 times.
+ */
+static void send_reset(void)
+{
+ struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE;
+ int i;
+ u32 delay;
+ u8 fdr;
+ int SDA_Tap[] = { 3, 3, 4, 4, 1, 1, 2, 2};
+ struct mpc5xxx_i2c_tap scltap[] = {
+ {4, 1},
+ {4, 2},
+ {6, 4},
+ {6, 8},
+ {14, 16},
+ {30, 32},
+ {62, 64},
+ {126, 128}
+ };
+
+ fdr = (u8)mpc_reg_in(®s->mfdr);
+
+ delay = scltap[FDR432(fdr)].scl2tap + ((SDA_Tap[FDR510(fdr)] - 1) * \
+ scltap[FDR432(fdr)].tap2tap) + 3;
+
+ for (i = 0; i < 9; i++) {
+ mpc_reg_out(®s->mcr, I2C_EN|I2C_STA|I2C_TX, I2C_INIT_MASK);
+ udelay(delay);
+ mpc_reg_out(®s->mcr, 0, I2C_INIT_MASK);
+ udelay(delay);
+ }
+
+ mpc_reg_out(®s->mcr, I2C_EN, I2C_INIT_MASK);
+}
+#endif /* CONFIG_SYS_I2c_INIT_MPC5XXX */
+
/**************** I2C API ****************/
void i2c_init(int speed, int saddr)
/* Set clock
*/
- mpc_reg_out(®s->mfdr, speed, 0);
+ mpc_reg_out(®s->mfdr, mpc_get_fdr(speed), 0);
/* Enable module
*/
mpc_reg_out(®s->mcr, I2C_EN, I2C_INIT_MASK);
mpc_reg_out(®s->msr, 0, I2C_IF);
+#if defined(CONFIG_SYS_I2C_INIT_MPC5XXX)
+ send_reset();
+#endif
return;
}
+static int mpc_get_fdr(int speed)
+{
+ static int fdr = -1;
+
+ if (fdr == -1) {
+ ulong best_speed = 0;
+ ulong divider;
+ ulong ipb, scl;
+ ulong bestmatch = 0xffffffffUL;
+ int best_i = 0, best_j = 0, i, j;
+ int SCL_Tap[] = { 9, 10, 12, 15, 5, 6, 7, 8};
+ struct mpc5xxx_i2c_tap scltap[] = {
+ {4, 1},
+ {4, 2},
+ {6, 4},
+ {6, 8},
+ {14, 16},
+ {30, 32},
+ {62, 64},
+ {126, 128}
+ };
+
+ ipb = gd->ipb_clk;
+ for (i = 7; i >= 0; i--) {
+ for (j = 7; j >= 0; j--) {
+ scl = 2 * (scltap[j].scl2tap +
+ (SCL_Tap[i] - 1) * scltap[j].tap2tap + 2);
+ if (ipb <= speed*scl) {
+ if ((speed*scl - ipb) < bestmatch) {
+ bestmatch = speed*scl - ipb;
+ best_i = i;
+ best_j = j;
+ best_speed = ipb/scl;
+ }
+ }
+ }
+ }
+ divider = (best_i & 3) | ((best_i & 4) << 3) | (best_j << 2);
+ if (gd->flags & GD_FLG_RELOC) {
+ fdr = divider;
+ } else {
+ if (gd->have_console)
+ printf("%ld kHz, ", best_speed / 1000);
+ return divider;
+ }
+ }
+
+ return fdr;
+}
+
int i2c_probe(uchar chip)
{
struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE;
if (! do_address(chip, 0)) {
mpc_reg_out(®s->mcr, 0, I2C_STA);
+ udelay(500);
break;
}
int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
{
- uchar xaddr[4];
+ char xaddr[4];
struct mpc5xxx_i2c * regs = (struct mpc5xxx_i2c *)I2C_BASE;
int ret = -1;
xaddr[3] = addr & 0xFF;
if (wait_for_bb()) {
- printf("i2c_read: bus is busy\n");
+ if (gd->have_console)
+ printf("i2c_read: bus is busy\n");
goto Done;
}
mpc_reg_out(®s->mcr, I2C_STA, I2C_STA);
if (do_address(chip, 0)) {
- printf("i2c_read: failed to address chip\n");
+ if (gd->have_console)
+ printf("i2c_read: failed to address chip\n");
goto Done;
}
if (send_bytes(chip, &xaddr[4-alen], alen)) {
- printf("i2c_read: send_bytes failed\n");
+ if (gd->have_console)
+ printf("i2c_read: send_bytes failed\n");
goto Done;
}
mpc_reg_out(®s->mcr, I2C_RSTA, I2C_RSTA);
if (do_address(chip, 1)) {
- printf("i2c_read: failed to address chip\n");
+ if (gd->have_console)
+ printf("i2c_read: failed to address chip\n");
goto Done;
}
- if (receive_bytes(chip, buf, len)) {
- printf("i2c_read: receive_bytes failed\n");
+ if (receive_bytes(chip, (char *)buf, len)) {
+ if (gd->have_console)
+ printf("i2c_read: receive_bytes failed\n");
goto Done;
}
int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
{
- uchar xaddr[4];
+ char xaddr[4];
struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE;
int ret = -1;
xaddr[2] = (addr >> 8) & 0xFF;
xaddr[3] = addr & 0xFF;
- if (wait_for_bb()) {
- printf("i2c_write: bus is busy\n");
+ if (wait_for_bb()) {
+ if (gd->have_console)
+ printf("i2c_write: bus is busy\n");
goto Done;
}
- mpc_reg_out(®s->mcr, I2C_STA, I2C_STA);
- if (do_address(chip, 0)) {
- printf("i2c_write: failed to address chip\n");
+ mpc_reg_out(®s->mcr, I2C_STA, I2C_STA);
+ if (do_address(chip, 0)) {
+ if (gd->have_console)
+ printf("i2c_write: failed to address chip\n");
goto Done;
}
if (send_bytes(chip, &xaddr[4-alen], alen)) {
- printf("i2c_write: send_bytes failed\n");
+ if (gd->have_console)
+ printf("i2c_write: send_bytes failed\n");
goto Done;
}
- if (send_bytes(chip, buf, len)) {
- printf("i2c_write: send_bytes failed\n");
+ if (send_bytes(chip, (char *)buf, len)) {
+ if (gd->have_console)
+ printf("i2c_write: send_bytes failed\n");
goto Done;
}
return ret;
}
-uchar i2c_reg_read(uchar chip, uchar reg)
-{
- char buf;
-
- i2c_read(chip, reg, 1, &buf, 1);
-
- return buf;
-}
-
-void i2c_reg_write(uchar chip, uchar reg, uchar val)
-{
- i2c_write(chip, reg, 1, &val, 1);
-
- return;
-}
-
#endif /* CONFIG_HARD_I2C */