diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc512x/i2c.c')
-rw-r--r-- | arch/powerpc/cpu/mpc512x/i2c.c | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/arch/powerpc/cpu/mpc512x/i2c.c b/arch/powerpc/cpu/mpc512x/i2c.c deleted file mode 100644 index 15d519a..0000000 --- a/arch/powerpc/cpu/mpc512x/i2c.c +++ /dev/null @@ -1,386 +0,0 @@ -/* - * (C) Copyright 2003 - 2009 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * SPDX-License-Identifier: GPL-2.0+ - * - * Based on the MPC5xxx code. - */ - -#include <common.h> -#include <asm/io.h> - -DECLARE_GLOBAL_DATA_PTR; - -#ifdef CONFIG_HARD_I2C - -#include <i2c.h> - -/* by default set I2C bus 0 active */ -static unsigned int bus_num __attribute__ ((section (".data"))) = 0; - -#define I2C_TIMEOUT 100 -#define I2C_RETRIES 3 - -struct mpc512x_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 wait_for_pin(int *status); -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) -{ - int ret = in_be32(reg) >> 24; - - return ret; -} - -static void mpc_reg_out (volatile u32 *reg, int val, int mask) -{ - if (!mask) { - out_be32(reg, val << 24); - } else { - clrsetbits_be32(reg, mask << 24, (val & mask) << 24); - } -} - -static int wait_for_bb (void) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - int timeout = I2C_TIMEOUT; - int status; - - status = mpc_reg_in (®s->msr); - - while (timeout-- && (status & I2C_BB)) { - mpc_reg_out (®s->mcr, I2C_STA, I2C_STA); - (void)mpc_reg_in(®s->mdr); - mpc_reg_out (®s->mcr, 0, I2C_STA); - mpc_reg_out (®s->mcr, 0, 0); - mpc_reg_out (®s->mcr, I2C_EN, 0); - - udelay (1000); - status = mpc_reg_in (®s->msr); - } - - return (status & I2C_BB); -} - -static int wait_for_pin (int *status) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - int timeout = I2C_TIMEOUT; - - *status = mpc_reg_in (®s->msr); - - while (timeout-- && !(*status & I2C_IF)) { - udelay (1000); - *status = mpc_reg_in (®s->msr); - } - - if (!(*status & I2C_IF)) { - return -1; - } - - mpc_reg_out (®s->msr, 0, I2C_IF); - - return 0; -} - -static int do_address (uchar chip, char rdwr_flag) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - int status; - - chip <<= 1; - - if (rdwr_flag) { - chip |= 1; - } - - mpc_reg_out (®s->mcr, I2C_TX, I2C_TX); - mpc_reg_out (®s->mdr, chip, 0); - - if (wait_for_pin (&status)) { - return -2; - } - - if (status & I2C_RXAK) { - return -3; - } - - return 0; -} - -static int send_bytes (uchar chip, char *buf, int len) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - int wrcount; - int status; - - for (wrcount = 0; wrcount < len; ++wrcount) { - - mpc_reg_out (®s->mdr, buf[wrcount], 0); - - if (wait_for_pin (&status)) { - break; - } - - if (status & I2C_RXAK) { - break; - } - - } - - return !(wrcount == len); -} - -static int receive_bytes (uchar chip, char *buf, int len) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - int dummy = 1; - int rdcount = 0; - int status; - int i; - - mpc_reg_out (®s->mcr, 0, I2C_TX); - - for (i = 0; i < len; ++i) { - buf[rdcount] = mpc_reg_in (®s->mdr); - - if (dummy) { - dummy = 0; - } else { - rdcount++; - } - - if (wait_for_pin (&status)) { - return -4; - } - } - - mpc_reg_out (®s->mcr, I2C_TXAK, I2C_TXAK); - buf[rdcount++] = mpc_reg_in (®s->mdr); - - if (wait_for_pin (&status)) { - return -5; - } - - mpc_reg_out (®s->mcr, 0, I2C_TXAK); - - return 0; -} - -/**************** I2C API ****************/ - -void i2c_init (int speed, int saddr) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - int i; - - for (i = 0; i < I2C_BUS_CNT; i++){ - volatile i2c512x_dev_t *regs = &im->i2c.dev[i]; - - mpc_reg_out (®s->mcr, 0, 0); - - /* Set clock */ - mpc_reg_out (®s->mfdr, mpc_get_fdr (speed), 0); - mpc_reg_out (®s->madr, saddr << 1, 0); - - /* Enable module */ - mpc_reg_out (®s->mcr, I2C_EN, I2C_INIT_MASK); - mpc_reg_out (®s->msr, 0, I2C_IF); - } - - /* Disable interrupts */ - out_be32(&im->i2c.icr, 0); - - /* Turn off filters */ - out_be32(&im->i2c.mifr, 0); -} - -static int mpc_get_fdr (int speed) -{ - static int fdr = -1; - - if (fdr == -1) { - ulong best_speed = 0; - ulong divider; - ulong ips, 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 mpc512x_i2c_tap scltap[] = { - {4, 1}, - {4, 2}, - {6, 4}, - {6, 8}, - {14, 16}, - {30, 32}, - {62, 64}, - {126, 128} - }; - - ips = gd->arch.ips_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 (ips <= speed*scl) { - if ((speed*scl - ips) < bestmatch) { - bestmatch = speed*scl - ips; - best_i = i; - best_j = j; - best_speed = ips/scl; - } - } - } - } - divider = (best_i & 3) | ((best_i & 4) << 3) | (best_j << 2); - if (gd->flags & GD_FLG_RELOC) { - fdr = divider; - } else { - debug("%ld kHz, \n", best_speed / 1000); - return divider; - } - } - - return fdr; -} - -int i2c_probe (uchar chip) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - int i; - - for (i = 0; i < I2C_RETRIES; i++) { - mpc_reg_out (®s->mcr, I2C_STA, I2C_STA); - - if (! do_address (chip, 0)) { - mpc_reg_out (®s->mcr, 0, I2C_STA); - udelay (500); - break; - } - - mpc_reg_out (®s->mcr, 0, I2C_STA); - udelay (500); - } - - return (i == I2C_RETRIES); -} - -int i2c_read (uchar chip, uint addr, int alen, uchar *buf, int len) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - char xaddr[4]; - int ret = -1; - - xaddr[0] = (addr >> 24) & 0xFF; - xaddr[1] = (addr >> 16) & 0xFF; - xaddr[2] = (addr >> 8) & 0xFF; - xaddr[3] = addr & 0xFF; - - if (wait_for_bb ()) { - 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"); - goto Done; - } - - if (send_bytes (chip, &xaddr[4-alen], alen)) { - 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"); - goto Done; - } - - if (receive_bytes (chip, (char *)buf, len)) { - printf ("i2c_read: receive_bytes failed\n"); - goto Done; - } - - ret = 0; -Done: - mpc_reg_out (®s->mcr, 0, I2C_STA); - return ret; -} - -int i2c_write (uchar chip, uint addr, int alen, uchar *buf, int len) -{ - volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; - volatile i2c512x_dev_t *regs = &im->i2c.dev[bus_num]; - char xaddr[4]; - int ret = -1; - - xaddr[0] = (addr >> 24) & 0xFF; - xaddr[1] = (addr >> 16) & 0xFF; - xaddr[2] = (addr >> 8) & 0xFF; - xaddr[3] = addr & 0xFF; - - if (wait_for_bb ()) { - 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"); - goto Done; - } - - if (send_bytes (chip, &xaddr[4-alen], alen)) { - printf ("i2c_write: send_bytes failed\n"); - goto Done; - } - - if (send_bytes (chip, (char *)buf, len)) { - printf ("i2c_write: send_bytes failed\n"); - goto Done; - } - - ret = 0; -Done: - mpc_reg_out (®s->mcr, 0, I2C_STA); - return ret; -} - -int i2c_set_bus_num (unsigned int bus) -{ - if (bus >= I2C_BUS_CNT) { - return -1; - } - bus_num = bus; - - return 0; -} - -unsigned int i2c_get_bus_num (void) -{ - return bus_num; -} - -#endif /* CONFIG_HARD_I2C */ |