diff options
author | Vitaly Andrianov <vitalya@ti.com> | 2014-04-04 17:16:52 (GMT) |
---|---|---|
committer | Tom Rini <trini@ti.com> | 2014-04-17 21:24:38 (GMT) |
commit | e8459dcc33c3f3fc5a98b7b69bb3ddd7ad77f632 (patch) | |
tree | 7ac851714e6849d5e1d1e16e34707b39d109c1e9 /drivers/i2c/davinci_i2c.c | |
parent | 356d15ebb2b0bb2adde2ca4fe4cccb87f75531a0 (diff) | |
download | u-boot-e8459dcc33c3f3fc5a98b7b69bb3ddd7ad77f632.tar.xz |
i2c, davinci: convert driver to new mutlibus/mutliadapter framework
- add davinci driver to new multibus/multiadpater support
- adapted all config files, which uses this driver
Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Acked-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'drivers/i2c/davinci_i2c.c')
-rw-r--r-- | drivers/i2c/davinci_i2c.c | 401 |
1 files changed, 234 insertions, 167 deletions
diff --git a/drivers/i2c/davinci_i2c.c b/drivers/i2c/davinci_i2c.c index 6e5260c..9ca99c4 100644 --- a/drivers/i2c/davinci_i2c.c +++ b/drivers/i2c/davinci_i2c.c @@ -1,8 +1,9 @@ /* * TI DaVinci (TMS320DM644x) I2C driver. * - * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> - * + * (C) Copyright 2012-2014 + * Texas Instruments Incorporated, <www.ti.com> + * (C) Copyright 2007 Sergey Kubushyn <ksi@koi8.net> * -------------------------------------------------------- * * SPDX-License-Identifier: GPL-2.0+ @@ -12,306 +13,372 @@ #include <i2c.h> #include <asm/arch/hardware.h> #include <asm/arch/i2c_defs.h> +#include <asm/io.h> #include "davinci_i2c.h" #define CHECK_NACK() \ do {\ if (tmp & (I2C_TIMEOUT | I2C_STAT_NACK)) {\ - REG(I2C_CON) = 0;\ - return(1);\ - }\ + REG(&(i2c_base->i2c_con)) = 0;\ + return 1;\ + } \ } while (0) +static struct i2c_regs *davinci_get_base(struct i2c_adapter *adap); -static int wait_for_bus(void) +static int wait_for_bus(struct i2c_adapter *adap) { + struct i2c_regs *i2c_base = davinci_get_base(adap); int stat, timeout; - REG(I2C_STAT) = 0xffff; + REG(&(i2c_base->i2c_stat)) = 0xffff; for (timeout = 0; timeout < 10; timeout++) { - if (!((stat = REG(I2C_STAT)) & I2C_STAT_BB)) { - REG(I2C_STAT) = 0xffff; - return(0); + stat = REG(&(i2c_base->i2c_stat)); + if (!((stat) & I2C_STAT_BB)) { + REG(&(i2c_base->i2c_stat)) = 0xffff; + return 0; } - REG(I2C_STAT) = stat; + REG(&(i2c_base->i2c_stat)) = stat; udelay(50000); } - REG(I2C_STAT) = 0xffff; - return(1); + REG(&(i2c_base->i2c_stat)) = 0xffff; + return 1; } -static int poll_i2c_irq(int mask) +static int poll_i2c_irq(struct i2c_adapter *adap, int mask) { + struct i2c_regs *i2c_base = davinci_get_base(adap); int stat, timeout; for (timeout = 0; timeout < 10; timeout++) { udelay(1000); - stat = REG(I2C_STAT); - if (stat & mask) { - return(stat); - } + stat = REG(&(i2c_base->i2c_stat)); + if (stat & mask) + return stat; } - REG(I2C_STAT) = 0xffff; - return(stat | I2C_TIMEOUT); + REG(&(i2c_base->i2c_stat)) = 0xffff; + return stat | I2C_TIMEOUT; } - -void flush_rx(void) +static void flush_rx(struct i2c_adapter *adap) { + struct i2c_regs *i2c_base = davinci_get_base(adap); + while (1) { - if (!(REG(I2C_STAT) & I2C_STAT_RRDY)) + if (!(REG(&(i2c_base->i2c_stat)) & I2C_STAT_RRDY)) break; - REG(I2C_DRR); - REG(I2C_STAT) = I2C_STAT_RRDY; + REG(&(i2c_base->i2c_drr)); + REG(&(i2c_base->i2c_stat)) = I2C_STAT_RRDY; udelay(1000); } } +static uint davinci_i2c_setspeed(struct i2c_adapter *adap, uint speed) +{ + struct i2c_regs *i2c_base = davinci_get_base(adap); + uint32_t div, psc; + + psc = 2; + /* SCLL + SCLH */ + div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10; + REG(&(i2c_base->i2c_psc)) = psc; /* 27MHz / (2 + 1) = 9MHz */ + REG(&(i2c_base->i2c_scll)) = (div * 50) / 100; /* 50% Duty */ + REG(&(i2c_base->i2c_sclh)) = div - REG(&(i2c_base->i2c_scll)); + + adap->speed = speed; + return 0; +} -void i2c_init(int speed, int slaveadd) +static void davinci_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd) { - u_int32_t div, psc; + struct i2c_regs *i2c_base = davinci_get_base(adap); - if (REG(I2C_CON) & I2C_CON_EN) { - REG(I2C_CON) = 0; - udelay (50000); + if (REG(&(i2c_base->i2c_con)) & I2C_CON_EN) { + REG(&(i2c_base->i2c_con)) = 0; + udelay(50000); } - psc = 2; - div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10; /* SCLL + SCLH */ - REG(I2C_PSC) = psc; /* 27MHz / (2 + 1) = 9MHz */ - REG(I2C_SCLL) = (div * 50) / 100; /* 50% Duty */ - REG(I2C_SCLH) = div - REG(I2C_SCLL); + davinci_i2c_setspeed(adap, speed); - REG(I2C_OA) = slaveadd; - REG(I2C_CNT) = 0; + REG(&(i2c_base->i2c_oa)) = slaveadd; + REG(&(i2c_base->i2c_cnt)) = 0; /* Interrupts must be enabled or I2C module won't work */ - REG(I2C_IE) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE | + REG(&(i2c_base->i2c_ie)) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE | I2C_IE_NACK_IE; /* Now enable I2C controller (get it out of reset) */ - REG(I2C_CON) = I2C_CON_EN; + REG(&(i2c_base->i2c_con)) = I2C_CON_EN; udelay(1000); } -int i2c_set_bus_speed(unsigned int speed) -{ - i2c_init(speed, CONFIG_SYS_I2C_SLAVE); - return 0; -} - -int i2c_probe(u_int8_t chip) +static int davinci_i2c_probe(struct i2c_adapter *adap, uint8_t chip) { + struct i2c_regs *i2c_base = davinci_get_base(adap); int rc = 1; - if (chip == REG(I2C_OA)) { - return(rc); - } + if (chip == REG(&(i2c_base->i2c_oa))) + return rc; - REG(I2C_CON) = 0; - if (wait_for_bus()) {return(1);} + REG(&(i2c_base->i2c_con)) = 0; + if (wait_for_bus(adap)) + return 1; /* try to read one byte from current (or only) address */ - REG(I2C_CNT) = 1; - REG(I2C_SA) = chip; - REG(I2C_CON) = (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP); - udelay (50000); + REG(&(i2c_base->i2c_cnt)) = 1; + REG(&(i2c_base->i2c_sa)) = chip; + REG(&(i2c_base->i2c_con)) = (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | + I2C_CON_STP); + udelay(50000); - if (!(REG(I2C_STAT) & I2C_STAT_NACK)) { + if (!(REG(&(i2c_base->i2c_stat)) & I2C_STAT_NACK)) { rc = 0; - flush_rx(); - REG(I2C_STAT) = 0xffff; + flush_rx(adap); + REG(&(i2c_base->i2c_stat)) = 0xffff; } else { - REG(I2C_STAT) = 0xffff; - REG(I2C_CON) |= I2C_CON_STP; + REG(&(i2c_base->i2c_stat)) = 0xffff; + REG(&(i2c_base->i2c_con)) |= I2C_CON_STP; udelay(20000); - if (wait_for_bus()) {return(1);} + if (wait_for_bus(adap)) + return 1; } - flush_rx(); - REG(I2C_STAT) = 0xffff; - REG(I2C_CNT) = 0; - return(rc); + flush_rx(adap); + REG(&(i2c_base->i2c_stat)) = 0xffff; + REG(&(i2c_base->i2c_cnt)) = 0; + return rc; } - -int i2c_read(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len) +static int davinci_i2c_read(struct i2c_adapter *adap, uint8_t chip, + uint32_t addr, int alen, uint8_t *buf, int len) { - u_int32_t tmp; + struct i2c_regs *i2c_base = davinci_get_base(adap); + uint32_t tmp; int i; if ((alen < 0) || (alen > 2)) { - printf("%s(): bogus address length %x\n", __FUNCTION__, alen); - return(1); + printf("%s(): bogus address length %x\n", __func__, alen); + return 1; } - if (wait_for_bus()) {return(1);} + if (wait_for_bus(adap)) + return 1; if (alen != 0) { /* Start address phase */ tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX; - REG(I2C_CNT) = alen; - REG(I2C_SA) = chip; - REG(I2C_CON) = tmp; + REG(&(i2c_base->i2c_cnt)) = alen; + REG(&(i2c_base->i2c_sa)) = chip; + REG(&(i2c_base->i2c_con)) = tmp; - tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK); + tmp = poll_i2c_irq(adap, I2C_STAT_XRDY | I2C_STAT_NACK); CHECK_NACK(); switch (alen) { - case 2: - /* Send address MSByte */ - if (tmp & I2C_STAT_XRDY) { - REG(I2C_DXR) = (addr >> 8) & 0xff; - } else { - REG(I2C_CON) = 0; - return(1); - } - - tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK); - - CHECK_NACK(); - /* No break, fall through */ - case 1: - /* Send address LSByte */ - if (tmp & I2C_STAT_XRDY) { - REG(I2C_DXR) = addr & 0xff; - } else { - REG(I2C_CON) = 0; - return(1); - } - - tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK | I2C_STAT_ARDY); - - CHECK_NACK(); - - if (!(tmp & I2C_STAT_ARDY)) { - REG(I2C_CON) = 0; - return(1); - } + case 2: + /* Send address MSByte */ + if (tmp & I2C_STAT_XRDY) { + REG(&(i2c_base->i2c_dxr)) = (addr >> 8) & 0xff; + } else { + REG(&(i2c_base->i2c_con)) = 0; + return 1; + } + + tmp = poll_i2c_irq(adap, I2C_STAT_XRDY | I2C_STAT_NACK); + + CHECK_NACK(); + /* No break, fall through */ + case 1: + /* Send address LSByte */ + if (tmp & I2C_STAT_XRDY) { + REG(&(i2c_base->i2c_dxr)) = addr & 0xff; + } else { + REG(&(i2c_base->i2c_con)) = 0; + return 1; + } + + tmp = poll_i2c_irq(adap, I2C_STAT_XRDY | + I2C_STAT_NACK | I2C_STAT_ARDY); + + CHECK_NACK(); + + if (!(tmp & I2C_STAT_ARDY)) { + REG(&(i2c_base->i2c_con)) = 0; + return 1; + } } } /* Address phase is over, now read 'len' bytes and stop */ tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP; - REG(I2C_CNT) = len & 0xffff; - REG(I2C_SA) = chip; - REG(I2C_CON) = tmp; + REG(&(i2c_base->i2c_cnt)) = len & 0xffff; + REG(&(i2c_base->i2c_sa)) = chip; + REG(&(i2c_base->i2c_con)) = tmp; for (i = 0; i < len; i++) { - tmp = poll_i2c_irq(I2C_STAT_RRDY | I2C_STAT_NACK | I2C_STAT_ROVR); + tmp = poll_i2c_irq(adap, I2C_STAT_RRDY | I2C_STAT_NACK | + I2C_STAT_ROVR); CHECK_NACK(); if (tmp & I2C_STAT_RRDY) { - buf[i] = REG(I2C_DRR); + buf[i] = REG(&(i2c_base->i2c_drr)); } else { - REG(I2C_CON) = 0; - return(1); + REG(&(i2c_base->i2c_con)) = 0; + return 1; } } - tmp = poll_i2c_irq(I2C_STAT_SCD | I2C_STAT_NACK); + tmp = poll_i2c_irq(adap, I2C_STAT_SCD | I2C_STAT_NACK); CHECK_NACK(); if (!(tmp & I2C_STAT_SCD)) { - REG(I2C_CON) = 0; - return(1); + REG(&(i2c_base->i2c_con)) = 0; + return 1; } - flush_rx(); - REG(I2C_STAT) = 0xffff; - REG(I2C_CNT) = 0; - REG(I2C_CON) = 0; + flush_rx(adap); + REG(&(i2c_base->i2c_stat)) = 0xffff; + REG(&(i2c_base->i2c_cnt)) = 0; + REG(&(i2c_base->i2c_con)) = 0; - return(0); + return 0; } - -int i2c_write(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len) +static int davinci_i2c_write(struct i2c_adapter *adap, uint8_t chip, + uint32_t addr, int alen, uint8_t *buf, int len) { - u_int32_t tmp; + struct i2c_regs *i2c_base = davinci_get_base(adap); + uint32_t tmp; int i; if ((alen < 0) || (alen > 2)) { - printf("%s(): bogus address length %x\n", __FUNCTION__, alen); - return(1); + printf("%s(): bogus address length %x\n", __func__, alen); + return 1; } if (len < 0) { - printf("%s(): bogus length %x\n", __FUNCTION__, len); - return(1); + printf("%s(): bogus length %x\n", __func__, len); + return 1; } - if (wait_for_bus()) {return(1);} + if (wait_for_bus(adap)) + return 1; /* Start address phase */ - tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX | I2C_CON_STP; - REG(I2C_CNT) = (alen == 0) ? len & 0xffff : (len & 0xffff) + alen; - REG(I2C_SA) = chip; - REG(I2C_CON) = tmp; + tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | + I2C_CON_TRX | I2C_CON_STP; + REG(&(i2c_base->i2c_cnt)) = (alen == 0) ? + len & 0xffff : (len & 0xffff) + alen; + REG(&(i2c_base->i2c_sa)) = chip; + REG(&(i2c_base->i2c_con)) = tmp; switch (alen) { - case 2: - /* Send address MSByte */ - tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK); + case 2: + /* Send address MSByte */ + tmp = poll_i2c_irq(adap, I2C_STAT_XRDY | I2C_STAT_NACK); - CHECK_NACK(); + CHECK_NACK(); - if (tmp & I2C_STAT_XRDY) { - REG(I2C_DXR) = (addr >> 8) & 0xff; - } else { - REG(I2C_CON) = 0; - return(1); - } - /* No break, fall through */ - case 1: - /* Send address LSByte */ - tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK); + if (tmp & I2C_STAT_XRDY) { + REG(&(i2c_base->i2c_dxr)) = (addr >> 8) & 0xff; + } else { + REG(&(i2c_base->i2c_con)) = 0; + return 1; + } + /* No break, fall through */ + case 1: + /* Send address LSByte */ + tmp = poll_i2c_irq(adap, I2C_STAT_XRDY | I2C_STAT_NACK); - CHECK_NACK(); + CHECK_NACK(); - if (tmp & I2C_STAT_XRDY) { - REG(I2C_DXR) = addr & 0xff; - } else { - REG(I2C_CON) = 0; - return(1); - } + if (tmp & I2C_STAT_XRDY) { + REG(&(i2c_base->i2c_dxr)) = addr & 0xff; + } else { + REG(&(i2c_base->i2c_con)) = 0; + return 1; + } } for (i = 0; i < len; i++) { - tmp = poll_i2c_irq(I2C_STAT_XRDY | I2C_STAT_NACK); + tmp = poll_i2c_irq(adap, I2C_STAT_XRDY | I2C_STAT_NACK); CHECK_NACK(); - if (tmp & I2C_STAT_XRDY) { - REG(I2C_DXR) = buf[i]; - } else { - return(1); - } + if (tmp & I2C_STAT_XRDY) + REG(&(i2c_base->i2c_dxr)) = buf[i]; + else + return 1; } - tmp = poll_i2c_irq(I2C_STAT_SCD | I2C_STAT_NACK); + tmp = poll_i2c_irq(adap, I2C_STAT_SCD | I2C_STAT_NACK); CHECK_NACK(); if (!(tmp & I2C_STAT_SCD)) { - REG(I2C_CON) = 0; - return(1); + REG(&(i2c_base->i2c_con)) = 0; + return 1; } - flush_rx(); - REG(I2C_STAT) = 0xffff; - REG(I2C_CNT) = 0; - REG(I2C_CON) = 0; + flush_rx(adap); + REG(&(i2c_base->i2c_stat)) = 0xffff; + REG(&(i2c_base->i2c_cnt)) = 0; + REG(&(i2c_base->i2c_con)) = 0; + + return 0; +} + +static struct i2c_regs *davinci_get_base(struct i2c_adapter *adap) +{ + switch (adap->hwadapnr) { +#if I2C_BUS_MAX >= 3 + case 2: + return (struct i2c_regs *)I2C2_BASE; +#endif +#if I2C_BUS_MAX >= 2 + case 1: + return (struct i2c_regs *)I2C1_BASE; +#endif + case 0: + return (struct i2c_regs *)I2C_BASE; + + default: + printf("wrong hwadapnr: %d\n", adap->hwadapnr); + } - return(0); + return NULL; } + +U_BOOT_I2C_ADAP_COMPLETE(davinci_0, davinci_i2c_init, davinci_i2c_probe, + davinci_i2c_read, davinci_i2c_write, + davinci_i2c_setspeed, + CONFIG_SYS_DAVINCI_I2C_SPEED, + CONFIG_SYS_DAVINCI_I2C_SLAVE, + 0) + +#if I2C_BUS_MAX >= 2 +U_BOOT_I2C_ADAP_COMPLETE(davinci_1, davinci_i2c_init, davinci_i2c_probe, + davinci_i2c_read, davinci_i2c_write, + davinci_i2c_setspeed, + CONFIG_SYS_DAVINCI_I2C_SPEED1, + CONFIG_SYS_DAVINCI_I2C_SLAVE1, + 1) +#endif + +#if I2C_BUS_MAX >= 3 +U_BOOT_I2C_ADAP_COMPLETE(davinci_2, davinci_i2c_init, davinci_i2c_probe, + davinci_i2c_read, davinci_i2c_write, + davinci_i2c_setspeed, + CONFIG_SYS_DAVINCI_I2C_SPEED2, + CONFIG_SYS_DAVINCI_I2C_SLAVE2, + 2) +#endif |