[U-Boot] [PATCH 01/16] i2c: adi_i2c: remove left-over Blackfin I2C driver

26 Oct 2017

This driver was used by Blackfin boards, but Blackfin support is
gone.  There is no user of this driver.
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com
---
drivers/i2c/Makefile  |   1 -
 drivers/i2c/adi_i2c.c | 309 --------------------------------------------------
 2 files changed, 310 deletions(-)
 delete mode 100644 drivers/i2c/adi_i2c.c

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index e7ade94..121e4e2 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -10,7 +10,6 @@ obj-$(CONFIG_DM_I2C_GPIO) += i2c-gpio.o
 obj-$(CONFIG_$(SPL_)I2C_CROS_EC_TUNNEL) += cros_ec_tunnel.o
 obj-$(CONFIG_$(SPL_)I2C_CROS_EC_LDO) += cros_ec_ldo.o
-obj-$(CONFIG_SYS_I2C_ADI) += adi_i2c.o
 obj-$(CONFIG_I2C_MV) += mv_i2c.o
 obj-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
 obj-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
diff --git a/drivers/i2c/adi_i2c.c b/drivers/i2c/adi_i2c.c
deleted file mode 100644
index d340639..0000000
--- a/drivers/i2c/adi_i2c.c
+++ /dev/null
@@ -1,309 +0,0 @@
-/*
- * i2c.c - driver for ADI TWI/I2C
- *
- * Copyright (c) 2006-2014 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- *
- * NOTE: This driver should be converted to driver model before June 2017.
- * Please see doc/driver-model/i2c-howto.txt for instructions.
- */
-
-#include <common.h>
-#include <console.h>
-#include <i2c.h>
-
-#include <asm/clock.h>
-#include <asm/twi.h>
-#include <asm/io.h>
-
-static struct twi_regs *i2c_get_base(struct i2c_adapter *adap);
-
-/* Every register is 32bit aligned, but only 16bits in size */
-#define ureg(name) u16 name; u16 __pad_##name;
-struct twi_regs {
-	ureg(clkdiv);
-	ureg(control);
-	ureg(slave_ctl);
-	ureg(slave_stat);
-	ureg(slave_addr);
-	ureg(master_ctl);
-	ureg(master_stat);
-	ureg(master_addr);
-	ureg(int_stat);
-	ureg(int_mask);
-	ureg(fifo_ctl);
-	ureg(fifo_stat);
-	char __pad[0x50];
-	ureg(xmt_data8);
-	ureg(xmt_data16);
-	ureg(rcv_data8);
-	ureg(rcv_data16);
-};
-#undef ureg
-
-#ifdef TWI_CLKDIV
-#define TWI0_CLKDIV TWI_CLKDIV
-# ifdef CONFIG_SYS_MAX_I2C_BUS
-# undef CONFIG_SYS_MAX_I2C_BUS
-# endif
-#define CONFIG_SYS_MAX_I2C_BUS 1
-#endif
-
-/*
- * The way speed is changed into duty often results in integer truncation
- * with 50% duty, so we'll force rounding up to the next duty by adding 1
- * to the max.  In practice this will get us a speed of something like
- * 385 KHz.  The other limit is easy to handle as it is only 8 bits.
- */
-#define I2C_SPEED_MAX             400000
-#define I2C_SPEED_TO_DUTY(speed)  (5000000 / (speed))
-#define I2C_DUTY_MAX              (I2C_SPEED_TO_DUTY(I2C_SPEED_MAX) + 1)
-#define I2C_DUTY_MIN              0xff	/* 8 bit limited */
-#define SYS_I2C_DUTY              I2C_SPEED_TO_DUTY(CONFIG_SYS_I2C_SPEED)
-/* Note: duty is inverse of speed, so the comparisons below are correct */
-#if SYS_I2C_DUTY < I2C_DUTY_MAX || SYS_I2C_DUTY > I2C_DUTY_MIN
-# error "The I2C hardware can only operate 20KHz - 400KHz"
-#endif
-
-/* All transfers are described by this data structure */
-struct adi_i2c_msg {
-	u8 flags;
-#define I2C_M_COMBO		0x4
-#define I2C_M_STOP		0x2
-#define I2C_M_READ		0x1
-	int len;		/* msg length */
-	u8 *buf;		/* pointer to msg data */
-	int alen;		/* addr length */
-	u8 *abuf;		/* addr buffer */
-};
-
-/* Allow msec timeout per ~byte transfer */
-#define I2C_TIMEOUT 10
-
-/**
- * wait_for_completion - manage the actual i2c transfer
- *	@msg: the i2c msg
- */
-static int wait_for_completion(struct twi_regs *twi, struct adi_i2c_msg *msg)
-{
-	u16 int_stat, ctl;
-	ulong timebase = get_timer(0);
-
-	do {
-		int_stat = readw(&twi->int_stat);
-
-		if (int_stat & XMTSERV) {
-			writew(XMTSERV, &twi->int_stat);
-			if (msg->alen) {
-				writew(*(msg->abuf++), &twi->xmt_data8);
-				--msg->alen;
-			} else if (!(msg->flags & I2C_M_COMBO) && msg->len) {
-				writew(*(msg->buf++), &twi->xmt_data8);
-				--msg->len;
-			} else {
-				ctl = readw(&twi->master_ctl);
-				if (msg->flags & I2C_M_COMBO)
-					writew(ctl | RSTART | MDIR,
-							&twi->master_ctl);
-				else
-					writew(ctl | STOP, &twi->master_ctl);
-			}
-		}
-		if (int_stat & RCVSERV) {
-			writew(RCVSERV, &twi->int_stat);
-			if (msg->len) {
-				*(msg->buf++) = readw(&twi->rcv_data8);
-				--msg->len;
-			} else if (msg->flags & I2C_M_STOP) {
-				ctl = readw(&twi->master_ctl);
-				writew(ctl | STOP, &twi->master_ctl);
-			}
-		}
-		if (int_stat & MERR) {
-			writew(MERR, &twi->int_stat);
-			return msg->len;
-		}
-		if (int_stat & MCOMP) {
-			writew(MCOMP, &twi->int_stat);
-			if (msg->flags & I2C_M_COMBO && msg->len) {
-				ctl = readw(&twi->master_ctl);
-				ctl = (ctl & ~RSTART) |
-					(min(msg->len, 0xff) << 6) | MEN | MDIR;
-				writew(ctl, &twi->master_ctl);
-			} else
-				break;
-		}
-
-		/* If we were able to do something, reset timeout */
-		if (int_stat)
-			timebase = get_timer(0);
-
-	} while (get_timer(timebase) < I2C_TIMEOUT);
-
-	return msg->len;
-}
-
-static int i2c_transfer(struct i2c_adapter *adap, uint8_t chip, uint addr,
-			int alen, uint8_t *buffer, int len, uint8_t flags)
-{
-	struct twi_regs *twi = i2c_get_base(adap);
-	int ret;
-	u16 ctl;
-	uchar addr_buffer[] = {
-		(addr >>  0),
-		(addr >>  8),
-		(addr >> 16),
-	};
-	struct adi_i2c_msg msg = {
-		.flags = flags | (len >= 0xff ? I2C_M_STOP : 0),
-		.buf   = buffer,
-		.len   = len,
-		.abuf  = addr_buffer,
-		.alen  = alen,
-	};
-
-	/* wait for things to settle */
-	while (readw(&twi->master_stat) & BUSBUSY)
-		if (ctrlc())
-			return 1;
-
-	/* Set Transmit device address */
-	writew(chip, &twi->master_addr);
-
-	/* Clear the FIFO before starting things */
-	writew(XMTFLUSH | RCVFLUSH, &twi->fifo_ctl);
-	writew(0, &twi->fifo_ctl);
-
-	/* prime the pump */
-	if (msg.alen) {
-		len = (msg.flags & I2C_M_COMBO) ? msg.alen : msg.alen + len;
-		writew(*(msg.abuf++), &twi->xmt_data8);
-		--msg.alen;
-	} else if (!(msg.flags & I2C_M_READ) && msg.len) {
-		writew(*(msg.buf++), &twi->xmt_data8);
-		--msg.len;
-	}
-
-	/* clear int stat */
-	writew(-1, &twi->master_stat);
-	writew(-1, &twi->int_stat);
-	writew(0, &twi->int_mask);
-
-	/* Master enable */
-	ctl = readw(&twi->master_ctl);
-	ctl = (ctl & FAST) | (min(len, 0xff) << 6) | MEN |
-		((msg.flags & I2C_M_READ) ? MDIR : 0);
-	writew(ctl, &twi->master_ctl);
-
-	/* process the rest */
-	ret = wait_for_completion(twi, &msg);
-
-	if (ret) {
-		ctl = readw(&twi->master_ctl) & ~MEN;
-		writew(ctl, &twi->master_ctl);
-		ctl = readw(&twi->control) & ~TWI_ENA;
-		writew(ctl, &twi->control);
-		ctl = readw(&twi->control) | TWI_ENA;
-		writew(ctl, &twi->control);
-	}
-
-	return ret;
-}
-
-static uint adi_i2c_setspeed(struct i2c_adapter *adap, uint speed)
-{
-	struct twi_regs *twi = i2c_get_base(adap);
-	u16 clkdiv = I2C_SPEED_TO_DUTY(speed);
-
-	/* Set TWI interface clock */
-	if (clkdiv < I2C_DUTY_MAX || clkdiv > I2C_DUTY_MIN)
-		return -1;
-	clkdiv = (clkdiv << 8) | (clkdiv & 0xff);
-	writew(clkdiv, &twi->clkdiv);
-
-	/* Don't turn it on */
-	writew(speed > 100000 ? FAST : 0, &twi->master_ctl);
-
-	return 0;
-}
-
-static void adi_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
-{
-	struct twi_regs *twi = i2c_get_base(adap);
-	u16 prescale = ((get_i2c_clk() / 1000 / 1000 + 5) / 10) & 0x7F;
-
-	/* Set TWI internal clock as 10MHz */
-	writew(prescale, &twi->control);
-
-	/* Set TWI interface clock as specified */
-	i2c_set_bus_speed(speed);
-
-	/* Enable it */
-	writew(TWI_ENA | prescale, &twi->control);
-}
-
-static int adi_i2c_read(struct i2c_adapter *adap, uint8_t chip,
-			uint addr, int alen, uint8_t *buffer, int len)
-{
-	return i2c_transfer(adap, chip, addr, alen, buffer,
-			len, alen ? I2C_M_COMBO : I2C_M_READ);
-}
-
-static int adi_i2c_write(struct i2c_adapter *adap, uint8_t chip,
-			uint addr, int alen, uint8_t *buffer, int len)
-{
-	return i2c_transfer(adap, chip, addr, alen, buffer, len, 0);
-}
-
-static int adi_i2c_probe(struct i2c_adapter *adap, uint8_t chip)
-{
-	u8 byte;
-	return adi_i2c_read(adap, chip, 0, 0, &byte, 1);
-}
-
-static struct twi_regs *i2c_get_base(struct i2c_adapter *adap)
-{
-	switch (adap->hwadapnr) {
-#if CONFIG_SYS_MAX_I2C_BUS > 2
-	case 2:
-		return (struct twi_regs *)TWI2_CLKDIV;
-#endif
-#if CONFIG_SYS_MAX_I2C_BUS > 1
-	case 1:
-		return (struct twi_regs *)TWI1_CLKDIV;
-#endif
-	case 0:
-		return (struct twi_regs *)TWI0_CLKDIV;
-
-	default:
-		printf("wrong hwadapnr: %d\n", adap->hwadapnr);
-	}
-
-	return NULL;
-}
-
-U_BOOT_I2C_ADAP_COMPLETE(adi_i2c0, adi_i2c_init, adi_i2c_probe,
-			 adi_i2c_read, adi_i2c_write,
-			 adi_i2c_setspeed,
-			 CONFIG_SYS_I2C_SPEED,
-			 0,
-			 0)
-
-#if CONFIG_SYS_MAX_I2C_BUS > 1
-U_BOOT_I2C_ADAP_COMPLETE(adi_i2c1, adi_i2c_init, adi_i2c_probe,
-			 adi_i2c_read, adi_i2c_write,
-			 adi_i2c_setspeed,
-			 CONFIG_SYS_I2C_SPEED,
-			 0,
-			 1)
-#endif
-
-#if CONFIG_SYS_MAX_I2C_BUS > 2
-U_BOOT_I2C_ADAP_COMPLETE(adi_i2c2, adi_i2c_init, adi_i2c_probe,
-			 adi_i2c_read, adi_i2c_write,
-			 adi_i2c_setspeed,
-			 CONFIG_SYS_I2C_SPEED,
-			 0,
-			 2)
-#endif
-- 
2.7.4


    