+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * drivers/i2c/rcar_i2c.c
- *
- * Copyright (C) 2013 Renesas Electronics Corporation
- * Copyright (C) 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
- *
- * 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 <i2c.h>
-#include <asm/io.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-struct rcar_i2c {
- u32 icscr;
- u32 icmcr;
- u32 icssr;
- u32 icmsr;
- u32 icsier;
- u32 icmier;
- u32 icccr;
- u32 icsar;
- u32 icmar;
- u32 icrxdtxd;
- u32 icccr2;
- u32 icmpr;
- u32 ichpr;
- u32 iclpr;
-};
-
-#define MCR_MDBS 0x80 /* non-fifo mode switch */
-#define MCR_FSCL 0x40 /* override SCL pin */
-#define MCR_FSDA 0x20 /* override SDA pin */
-#define MCR_OBPC 0x10 /* override pins */
-#define MCR_MIE 0x08 /* master if enable */
-#define MCR_TSBE 0x04
-#define MCR_FSB 0x02 /* force stop bit */
-#define MCR_ESG 0x01 /* en startbit gen. */
-
-#define MSR_MASK 0x7f
-#define MSR_MNR 0x40 /* nack received */
-#define MSR_MAL 0x20 /* arbitration lost */
-#define MSR_MST 0x10 /* sent a stop */
-#define MSR_MDE 0x08
-#define MSR_MDT 0x04
-#define MSR_MDR 0x02
-#define MSR_MAT 0x01 /* slave addr xfer done */
-
-static const struct rcar_i2c *i2c_dev[CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS] = {
- (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C0_BASE,
- (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C1_BASE,
- (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C2_BASE,
- (struct rcar_i2c *)CONFIG_SYS_RCAR_I2C3_BASE,
-};
-
-static void rcar_i2c_raw_rw_common(struct rcar_i2c *dev, u8 chip, uint addr)
-{
- /* set slave address */
- writel(chip << 1, &dev->icmar);
- /* set register address */
- writel(addr, &dev->icrxdtxd);
- /* clear status */
- writel(0, &dev->icmsr);
- /* start master send */
- writel(MCR_MDBS | MCR_MIE | MCR_ESG, &dev->icmcr);
-
- while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDE))
- != (MSR_MAT | MSR_MDE))
- udelay(10);
-
- /* clear ESG */
- writel(MCR_MDBS | MCR_MIE, &dev->icmcr);
- /* start SCLclk */
- writel(~(MSR_MAT | MSR_MDE), &dev->icmsr);
-
- while (!(readl(&dev->icmsr) & MSR_MDE))
- udelay(10);
-}
-
-static void rcar_i2c_raw_rw_finish(struct rcar_i2c *dev)
-{
- while (!(readl(&dev->icmsr) & MSR_MST))
- udelay(10);
-
- writel(0, &dev->icmcr);
-}
-
-static int
-rcar_i2c_raw_write(struct rcar_i2c *dev, u8 chip, uint addr, u8 *val, int size)
-{
- rcar_i2c_raw_rw_common(dev, chip, addr);
-
- /* set send date */
- writel(*val, &dev->icrxdtxd);
- /* start SCLclk */
- writel(~MSR_MDE, &dev->icmsr);
-
- while (!(readl(&dev->icmsr) & MSR_MDE))
- udelay(10);
-
- /* set stop condition */
- writel(MCR_MDBS | MCR_MIE | MCR_FSB, &dev->icmcr);
- /* start SCLclk */
- writel(~MSR_MDE, &dev->icmsr);
-
- rcar_i2c_raw_rw_finish(dev);
-
- return 0;
-}
-
-static u8
-rcar_i2c_raw_read(struct rcar_i2c *dev, u8 chip, uint addr)
-{
- u8 ret;
-
- rcar_i2c_raw_rw_common(dev, chip, addr);
-
- /* set slave address, receive */
- writel((chip << 1) | 1, &dev->icmar);
- /* start master receive */
- writel(MCR_MDBS | MCR_MIE | MCR_ESG, &dev->icmcr);
- /* clear status */
- writel(0, &dev->icmsr);
-
- while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDR))
- != (MSR_MAT | MSR_MDR))
- udelay(10);
-
- /* clear ESG */
- writel(MCR_MDBS | MCR_MIE, &dev->icmcr);
- /* prepare stop condition */
- writel(MCR_MDBS | MCR_MIE | MCR_FSB, &dev->icmcr);
- /* start SCLclk */
- writel(~(MSR_MAT | MSR_MDR), &dev->icmsr);
-
- while (!(readl(&dev->icmsr) & MSR_MDR))
- udelay(10);
-
- /* get receive data */
- ret = (u8)readl(&dev->icrxdtxd);
- /* start SCLclk */
- writel(~MSR_MDR, &dev->icmsr);
-
- rcar_i2c_raw_rw_finish(dev);
-
- return ret;
-}
-
-/*
- * SCL = iicck / (20 + SCGD * 8 + F[(ticf + tr + intd) * iicck])
- * iicck : I2C internal clock < 20 MHz
- * ticf : I2C SCL falling time: 35 ns
- * tr : I2C SCL rising time: 200 ns
- * intd : LSI internal delay: I2C0: 50 ns I2C1-3: 5
- * F[n] : n rounded up to an integer
- */
-static u32 rcar_clock_gen(int i2c_no, u32 bus_speed)
-{
- u32 iicck, f, scl, scgd;
- u32 intd = 5;
-
- int bit = 0, cdf_width = 3;
- for (bit = 0; bit < (1 << cdf_width); bit++) {
- iicck = CONFIG_HP_CLK_FREQ / (1 + bit);
- if (iicck < 20000000)
- break;
- }
-
- if (bit > (1 << cdf_width)) {
- puts("rcar-i2c: Can not get CDF\n");
- return 0;
- }
-
- if (i2c_no == 0)
- intd = 50;
-
- f = (35 + 200 + intd) * (iicck / 1000000000);
-
- for (scgd = 0; scgd < 0x40; scgd++) {
- scl = iicck / (20 + (scgd * 8) + f);
- if (scl <= bus_speed)
- break;
- }
-
- if (scgd > 0x40) {
- puts("rcar-i2c: Can not get SDGB\n");
- return 0;
- }
-
- debug("%s: scl: %d\n", __func__, scl);
- debug("%s: bit %x\n", __func__, bit);
- debug("%s: scgd %x\n", __func__, scgd);
- debug("%s: iccr %x\n", __func__, (scgd << (cdf_width) | bit));
-
- return scgd << (cdf_width) | bit;
-}
-
-static void
-rcar_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
-{
- struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr];
- u32 icccr = 0;
-
- /* No i2c support prior to relocation */
- if (!(gd->flags & GD_FLG_RELOC))
- return;
-
- /*
- * reset slave mode.
- * slave mode is not used on this driver
- */
- writel(0, &dev->icsier);
- writel(0, &dev->icsar);
- writel(0, &dev->icscr);
- writel(0, &dev->icssr);
-
- /* reset master mode */
- writel(0, &dev->icmier);
- writel(0, &dev->icmcr);
- writel(0, &dev->icmsr);
- writel(0, &dev->icmar);
-
- icccr = rcar_clock_gen(adap->hwadapnr, adap->speed);
- if (icccr == 0)
- puts("I2C: Init failed\n");
- else
- writel(icccr, &dev->icccr);
-}
-
-static int rcar_i2c_read(struct i2c_adapter *adap, uint8_t chip,
- uint addr, int alen, u8 *data, int len)
-{
- struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr];
- int i;
-
- for (i = 0; i < len; i++)
- data[i] = rcar_i2c_raw_read(dev, chip, addr + i);
-
- return 0;
-}
-
-static int rcar_i2c_write(struct i2c_adapter *adap, uint8_t chip, uint addr,
- int alen, u8 *data, int len)
-{
- struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr];
- return rcar_i2c_raw_write(dev, chip, addr, data, len);
-}
-
-static int
-rcar_i2c_probe(struct i2c_adapter *adap, u8 dev)
-{
- return rcar_i2c_read(adap, dev, 0, 0, NULL, 0);
-}
-
-static unsigned int rcar_i2c_set_bus_speed(struct i2c_adapter *adap,
- unsigned int speed)
-{
- struct rcar_i2c *dev = (struct rcar_i2c *)i2c_dev[adap->hwadapnr];
- u32 icccr;
- int ret = 0;
-
- rcar_i2c_raw_rw_finish(dev);
-
- icccr = rcar_clock_gen(adap->hwadapnr, speed);
- if (icccr == 0) {
- puts("I2C: Init failed\n");
- ret = -1;
- } else {
- writel(icccr, &dev->icccr);
- }
- return ret;
-}
-
-/*
- * Register RCAR i2c adapters
- */
-U_BOOT_I2C_ADAP_COMPLETE(rcar_0, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read,
- rcar_i2c_write, rcar_i2c_set_bus_speed,
- CONFIG_SYS_RCAR_I2C0_SPEED, 0, 0)
-U_BOOT_I2C_ADAP_COMPLETE(rcar_1, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read,
- rcar_i2c_write, rcar_i2c_set_bus_speed,
- CONFIG_SYS_RCAR_I2C1_SPEED, 0, 1)
-U_BOOT_I2C_ADAP_COMPLETE(rcar_2, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read,
- rcar_i2c_write, rcar_i2c_set_bus_speed,
- CONFIG_SYS_RCAR_I2C2_SPEED, 0, 2)
-U_BOOT_I2C_ADAP_COMPLETE(rcar_3, rcar_i2c_init, rcar_i2c_probe, rcar_i2c_read,
- rcar_i2c_write, rcar_i2c_set_bus_speed,
- CONFIG_SYS_RCAR_I2C3_SPEED, 0, 3)
projects / oweals / u-boot.git / commitdiff