2 * Copyright (C) 2011, 2013 Renesas Solutions Corp.
3 * Copyright (C) 2011, 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
5 * SPDX-License-Identifier: GPL-2.0+
11 DECLARE_GLOBAL_DATA_PTR;
13 /* Every register is 32bit aligned, but only 8bits in size */
14 #define ureg(name) u8 name; u8 __pad_##name##0; u16 __pad_##name##1;
25 static struct sh_i2c *base;
28 #define SH_I2C_ICCR_ICE (1 << 7)
29 #define SH_I2C_ICCR_RACK (1 << 6)
30 #define SH_I2C_ICCR_RTS (1 << 4)
31 #define SH_I2C_ICCR_BUSY (1 << 2)
32 #define SH_I2C_ICCR_SCP (1 << 0)
35 #define SH_IC_BUSY (1 << 4)
36 #define SH_IC_TACK (1 << 2)
37 #define SH_IC_WAIT (1 << 1)
38 #define SH_IC_DTE (1 << 0)
40 #ifdef CONFIG_SH_I2C_8BIT
41 /* store 8th bit of iccl and icch in ICIC register */
42 #define SH_I2C_ICIC_ICCLB8 (1 << 7)
43 #define SH_I2C_ICIC_ICCHB8 (1 << 6)
46 static u16 iccl, icch;
50 static void irq_dte(struct sh_i2c *base)
54 for (i = 0 ; i < IRQ_WAIT ; i++) {
55 if (SH_IC_DTE & readb(&base->icsr))
61 static int irq_dte_with_tack(struct sh_i2c *base)
65 for (i = 0 ; i < IRQ_WAIT ; i++) {
66 if (SH_IC_DTE & readb(&base->icsr))
68 if (SH_IC_TACK & readb(&base->icsr))
75 static void irq_busy(struct sh_i2c *base)
79 for (i = 0 ; i < IRQ_WAIT ; i++) {
80 if (!(SH_IC_BUSY & readb(&base->icsr)))
86 static int i2c_set_addr(struct sh_i2c *base, u8 id, u8 reg, int stop)
90 clrbits_8(&base->iccr, SH_I2C_ICCR_ICE);
91 setbits_8(&base->iccr, SH_I2C_ICCR_ICE);
93 writeb(iccl & 0xff, &base->iccl);
94 writeb(icch & 0xff, &base->icch);
95 #ifdef CONFIG_SH_I2C_8BIT
97 icic |= SH_I2C_ICIC_ICCLB8;
99 icic |= SH_I2C_ICIC_ICCHB8;
101 writeb(icic, &base->icic);
103 writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &base->iccr);
106 clrbits_8(&base->icsr, SH_IC_TACK);
107 writeb(id << 1, &base->icdr);
108 if (irq_dte_with_tack(base) != 0)
111 writeb(reg, &base->icdr);
113 writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS), &base->iccr);
115 if (irq_dte_with_tack(base) != 0)
120 static void i2c_finish(struct sh_i2c *base)
122 writeb(0, &base->icsr);
123 clrbits_8(&base->iccr, SH_I2C_ICCR_ICE);
126 static int i2c_raw_write(struct sh_i2c *base, u8 id, u8 reg, u8 val)
129 if (i2c_set_addr(base, id, reg, 0) != 0)
133 writeb(val, &base->icdr);
134 if (irq_dte_with_tack(base) != 0)
137 writeb((SH_I2C_ICCR_ICE | SH_I2C_ICCR_RTS), &base->iccr);
138 if (irq_dte_with_tack(base) != 0)
147 static int i2c_raw_read(struct sh_i2c *base, u8 id, u8 reg)
151 #if defined(CONFIG_SH73A0)
152 if (i2c_set_addr(base, id, reg, 0) != 0)
155 if (i2c_set_addr(base, id, reg, 1) != 0)
160 writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &base->iccr);
163 writeb(id << 1 | 0x01, &base->icdr);
164 if (irq_dte_with_tack(base) != 0)
167 writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_SCP), &base->iccr);
168 if (irq_dte_with_tack(base) != 0)
171 ret = readb(&base->icdr) & 0xff;
173 writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RACK), &base->iccr);
174 readb(&base->icdr); /* Dummy read */
182 #ifdef CONFIG_I2C_MULTI_BUS
183 static unsigned int current_bus;
186 * i2c_set_bus_num - change active I2C bus
187 * @bus: bus index, zero based
188 * @returns: 0 on success, non-0 on failure
190 int i2c_set_bus_num(unsigned int bus)
192 if ((bus < 0) || (bus >= CONFIG_SYS_MAX_I2C_BUS)) {
193 printf("Bad bus: %d\n", bus);
199 base = (void *)CONFIG_SH_I2C_BASE0;
202 base = (void *)CONFIG_SH_I2C_BASE1;
204 #ifdef CONFIG_SH_I2C_BASE2
206 base = (void *)CONFIG_SH_I2C_BASE2;
209 #ifdef CONFIG_SH_I2C_BASE3
211 base = (void *)CONFIG_SH_I2C_BASE3;
214 #ifdef CONFIG_SH_I2C_BASE4
216 base = (void *)CONFIG_SH_I2C_BASE4;
228 * i2c_get_bus_num - returns index of active I2C bus
230 unsigned int i2c_get_bus_num(void)
236 #define SH_I2C_ICCL_CALC(clk, date, t_low, t_high) \
237 ((clk / rate) * (t_low / t_low + t_high))
238 #define SH_I2C_ICCH_CALC(clk, date, t_low, t_high) \
239 ((clk / rate) * (t_high / t_low + t_high))
241 void i2c_init(int speed, int slaveaddr)
245 /* No i2c support prior to relocation */
246 if (!(gd->flags & GD_FLG_RELOC))
249 #ifdef CONFIG_I2C_MULTI_BUS
252 base = (struct sh_i2c *)CONFIG_SH_I2C_BASE0;
255 * Calculate the value for iccl. From the data sheet:
256 * iccl = (p-clock / transfer-rate) * (L / (L + H))
257 * where L and H are the SCL low and high ratio.
259 num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_LOW;
260 denom = speed * (CONFIG_SH_I2C_DATA_HIGH + CONFIG_SH_I2C_DATA_LOW);
261 tmp = num * 10 / denom;
263 iccl = (u16)((num/denom) + 1);
265 iccl = (u16)(num/denom);
267 /* Calculate the value for icch. From the data sheet:
268 icch = (p clock / transfer rate) * (H / (L + H)) */
269 num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_HIGH;
270 tmp = num * 10 / denom;
272 icch = (u16)((num/denom) + 1);
274 icch = (u16)(num/denom);
278 * i2c_read: - Read multiple bytes from an i2c device
280 * The higher level routines take into account that this function is only
281 * called with len < page length of the device (see configuration file)
283 * @chip: address of the chip which is to be read
284 * @addr: i2c data address within the chip
285 * @alen: length of the i2c data address (1..2 bytes)
286 * @buffer: where to write the data
287 * @len: how much byte do we want to read
288 * @return: 0 in case of success
290 int i2c_read(u8 chip, u32 addr, int alen, u8 *buffer, int len)
294 for (i = 0 ; i < len ; i++) {
295 ret = i2c_raw_read(base, chip, addr + i);
298 buffer[i] = ret & 0xff;
304 * i2c_write: - Write multiple bytes to an i2c device
306 * The higher level routines take into account that this function is only
307 * called with len < page length of the device (see configuration file)
309 * @chip: address of the chip which is to be written
310 * @addr: i2c data address within the chip
311 * @alen: length of the i2c data address (1..2 bytes)
312 * @buffer: where to find the data to be written
313 * @len: how much byte do we want to read
314 * @return: 0 in case of success
316 int i2c_write(u8 chip, u32 addr, int alen, u8 *buffer, int len)
319 for (i = 0; i < len ; i++)
320 if (i2c_raw_write(base, chip, addr + i, buffer[i]) != 0)
326 * i2c_probe: - Test if a chip answers for a given i2c address
328 * @chip: address of the chip which is searched for
329 * @return: 0 if a chip was found, -1 otherwhise
331 int i2c_probe(u8 chip)
335 ret = i2c_set_addr(base, chip, 0, 1);