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Michal Simekbeedbcf2013-04-22 15:21:33 +02001/*
2 * Driver for the Zynq-7000 PS I2C controller
3 * IP from Cadence (ID T-CS-PE-0007-100, Version R1p10f2)
4 *
5 * Author: Joe Hershberger <joe.hershberger@ni.com>
6 * Copyright (c) 2012 Joe Hershberger.
7 *
8 * Copyright (c) 2012-2013 Xilinx, Michal Simek
9 *
Wolfgang Denkd79de1d2013-07-08 09:37:19 +020010 * SPDX-License-Identifier: GPL-2.0+
Michal Simekbeedbcf2013-04-22 15:21:33 +020011 */
12
13#include <common.h>
14#include <asm/io.h>
15#include <i2c.h>
16#include <asm/errno.h>
17#include <asm/arch/hardware.h>
18
19/* i2c register set */
20struct zynq_i2c_registers {
21 u32 control;
22 u32 status;
23 u32 address;
24 u32 data;
25 u32 interrupt_status;
26 u32 transfer_size;
27 u32 slave_mon_pause;
28 u32 time_out;
29 u32 interrupt_mask;
30 u32 interrupt_enable;
31 u32 interrupt_disable;
32};
33
34/* Control register fields */
35#define ZYNQ_I2C_CONTROL_RW 0x00000001
36#define ZYNQ_I2C_CONTROL_MS 0x00000002
37#define ZYNQ_I2C_CONTROL_NEA 0x00000004
38#define ZYNQ_I2C_CONTROL_ACKEN 0x00000008
39#define ZYNQ_I2C_CONTROL_HOLD 0x00000010
40#define ZYNQ_I2C_CONTROL_SLVMON 0x00000020
41#define ZYNQ_I2C_CONTROL_CLR_FIFO 0x00000040
42#define ZYNQ_I2C_CONTROL_DIV_B_SHIFT 8
43#define ZYNQ_I2C_CONTROL_DIV_B_MASK 0x00003F00
44#define ZYNQ_I2C_CONTROL_DIV_A_SHIFT 14
45#define ZYNQ_I2C_CONTROL_DIV_A_MASK 0x0000C000
46
47/* Status register values */
48#define ZYNQ_I2C_STATUS_RXDV 0x00000020
49#define ZYNQ_I2C_STATUS_TXDV 0x00000040
50#define ZYNQ_I2C_STATUS_RXOVF 0x00000080
51#define ZYNQ_I2C_STATUS_BA 0x00000100
52
53/* Interrupt register fields */
54#define ZYNQ_I2C_INTERRUPT_COMP 0x00000001
55#define ZYNQ_I2C_INTERRUPT_DATA 0x00000002
56#define ZYNQ_I2C_INTERRUPT_NACK 0x00000004
57#define ZYNQ_I2C_INTERRUPT_TO 0x00000008
58#define ZYNQ_I2C_INTERRUPT_SLVRDY 0x00000010
59#define ZYNQ_I2C_INTERRUPT_RXOVF 0x00000020
60#define ZYNQ_I2C_INTERRUPT_TXOVF 0x00000040
61#define ZYNQ_I2C_INTERRUPT_RXUNF 0x00000080
62#define ZYNQ_I2C_INTERRUPT_ARBLOST 0x00000200
63
64#define ZYNQ_I2C_FIFO_DEPTH 16
65#define ZYNQ_I2C_TRANSFERT_SIZE_MAX 255 /* Controller transfer limit */
66
Michael Burr91fae472014-01-22 09:46:08 +010067static struct zynq_i2c_registers *i2c_select(struct i2c_adapter *adap)
68{
69 return adap->hwadapnr ?
70 /* Zynq PS I2C1 */
71 (struct zynq_i2c_registers *)ZYNQ_I2C_BASEADDR1 :
72 /* Zynq PS I2C0 */
73 (struct zynq_i2c_registers *)ZYNQ_I2C_BASEADDR0;
74}
Michal Simekbeedbcf2013-04-22 15:21:33 +020075
76/* I2C init called by cmd_i2c when doing 'i2c reset'. */
Heiko Schocher465819a2013-11-08 07:30:53 +010077static void zynq_i2c_init(struct i2c_adapter *adap, int requested_speed,
78 int slaveadd)
Michal Simekbeedbcf2013-04-22 15:21:33 +020079{
Michael Burr91fae472014-01-22 09:46:08 +010080 struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
81
Michal Simekbeedbcf2013-04-22 15:21:33 +020082 /* 111MHz / ( (3 * 17) * 22 ) = ~100KHz */
83 writel((16 << ZYNQ_I2C_CONTROL_DIV_B_SHIFT) |
84 (2 << ZYNQ_I2C_CONTROL_DIV_A_SHIFT), &zynq_i2c->control);
85
86 /* Enable master mode, ack, and 7-bit addressing */
87 setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_MS |
88 ZYNQ_I2C_CONTROL_ACKEN | ZYNQ_I2C_CONTROL_NEA);
89}
90
91#ifdef DEBUG
Michael Burr91fae472014-01-22 09:46:08 +010092static void zynq_i2c_debug_status(struct zynq_i2c_registers *zynq_i2c)
Michal Simekbeedbcf2013-04-22 15:21:33 +020093{
94 int int_status;
95 int status;
96 int_status = readl(&zynq_i2c->interrupt_status);
97
98 status = readl(&zynq_i2c->status);
99 if (int_status || status) {
100 debug("Status: ");
101 if (int_status & ZYNQ_I2C_INTERRUPT_COMP)
102 debug("COMP ");
103 if (int_status & ZYNQ_I2C_INTERRUPT_DATA)
104 debug("DATA ");
105 if (int_status & ZYNQ_I2C_INTERRUPT_NACK)
106 debug("NACK ");
107 if (int_status & ZYNQ_I2C_INTERRUPT_TO)
108 debug("TO ");
109 if (int_status & ZYNQ_I2C_INTERRUPT_SLVRDY)
110 debug("SLVRDY ");
111 if (int_status & ZYNQ_I2C_INTERRUPT_RXOVF)
112 debug("RXOVF ");
113 if (int_status & ZYNQ_I2C_INTERRUPT_TXOVF)
114 debug("TXOVF ");
115 if (int_status & ZYNQ_I2C_INTERRUPT_RXUNF)
116 debug("RXUNF ");
117 if (int_status & ZYNQ_I2C_INTERRUPT_ARBLOST)
118 debug("ARBLOST ");
119 if (status & ZYNQ_I2C_STATUS_RXDV)
120 debug("RXDV ");
121 if (status & ZYNQ_I2C_STATUS_TXDV)
122 debug("TXDV ");
123 if (status & ZYNQ_I2C_STATUS_RXOVF)
124 debug("RXOVF ");
125 if (status & ZYNQ_I2C_STATUS_BA)
126 debug("BA ");
127 debug("TS%d ", readl(&zynq_i2c->transfer_size));
128 debug("\n");
129 }
130}
131#endif
132
133/* Wait for an interrupt */
Michael Burr91fae472014-01-22 09:46:08 +0100134static u32 zynq_i2c_wait(struct zynq_i2c_registers *zynq_i2c, u32 mask)
Michal Simekbeedbcf2013-04-22 15:21:33 +0200135{
136 int timeout, int_status;
137
138 for (timeout = 0; timeout < 100; timeout++) {
139 udelay(100);
140 int_status = readl(&zynq_i2c->interrupt_status);
141 if (int_status & mask)
142 break;
143 }
144#ifdef DEBUG
Michael Burr91fae472014-01-22 09:46:08 +0100145 zynq_i2c_debug_status(zynq_i2c));
Michal Simekbeedbcf2013-04-22 15:21:33 +0200146#endif
147 /* Clear interrupt status flags */
148 writel(int_status & mask, &zynq_i2c->interrupt_status);
149
150 return int_status & mask;
151}
152
153/*
154 * I2C probe called by cmd_i2c when doing 'i2c probe'.
155 * Begin read, nak data byte, end.
156 */
Heiko Schocher465819a2013-11-08 07:30:53 +0100157static int zynq_i2c_probe(struct i2c_adapter *adap, u8 dev)
Michal Simekbeedbcf2013-04-22 15:21:33 +0200158{
Michael Burr91fae472014-01-22 09:46:08 +0100159 struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
160
Michal Simekbeedbcf2013-04-22 15:21:33 +0200161 /* Attempt to read a byte */
162 setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
163 ZYNQ_I2C_CONTROL_RW);
164 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
165 writel(0xFF, &zynq_i2c->interrupt_status);
166 writel(dev, &zynq_i2c->address);
167 writel(1, &zynq_i2c->transfer_size);
168
Michael Burr91fae472014-01-22 09:46:08 +0100169 return (zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP |
Michal Simekbeedbcf2013-04-22 15:21:33 +0200170 ZYNQ_I2C_INTERRUPT_NACK) &
171 ZYNQ_I2C_INTERRUPT_COMP) ? 0 : -ETIMEDOUT;
172}
173
174/*
175 * I2C read called by cmd_i2c when doing 'i2c read' and by cmd_eeprom.c
176 * Begin write, send address byte(s), begin read, receive data bytes, end.
177 */
Heiko Schocher465819a2013-11-08 07:30:53 +0100178static int zynq_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
179 int alen, u8 *data, int length)
Michal Simekbeedbcf2013-04-22 15:21:33 +0200180{
181 u32 status;
182 u32 i = 0;
183 u8 *cur_data = data;
Michael Burr91fae472014-01-22 09:46:08 +0100184 struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
Michal Simekbeedbcf2013-04-22 15:21:33 +0200185
186 /* Check the hardware can handle the requested bytes */
187 if ((length < 0) || (length > ZYNQ_I2C_TRANSFERT_SIZE_MAX))
188 return -EINVAL;
189
190 /* Write the register address */
191 setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
192 ZYNQ_I2C_CONTROL_HOLD);
193 /*
194 * Temporarily disable restart (by clearing hold)
195 * It doesn't seem to work.
196 */
Michael Burrd7de1892014-01-22 09:46:07 +0100197 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
Michal Simekbeedbcf2013-04-22 15:21:33 +0200198 writel(0xFF, &zynq_i2c->interrupt_status);
Michael Burrd7de1892014-01-22 09:46:07 +0100199 if (alen) {
200 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW);
201 writel(dev, &zynq_i2c->address);
202 while (alen--)
203 writel(addr >> (8 * alen), &zynq_i2c->data);
Michal Simekbeedbcf2013-04-22 15:21:33 +0200204
Michael Burrd7de1892014-01-22 09:46:07 +0100205 /* Wait for the address to be sent */
Michael Burr91fae472014-01-22 09:46:08 +0100206 if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
Michael Burrd7de1892014-01-22 09:46:07 +0100207 /* Release the bus */
208 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
209 return -ETIMEDOUT;
210 }
211 debug("Device acked address\n");
Michal Simekbeedbcf2013-04-22 15:21:33 +0200212 }
Michal Simekbeedbcf2013-04-22 15:21:33 +0200213
214 setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
215 ZYNQ_I2C_CONTROL_RW);
216 /* Start reading data */
217 writel(dev, &zynq_i2c->address);
218 writel(length, &zynq_i2c->transfer_size);
219
220 /* Wait for data */
221 do {
Michael Burr91fae472014-01-22 09:46:08 +0100222 status = zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP |
Michal Simekbeedbcf2013-04-22 15:21:33 +0200223 ZYNQ_I2C_INTERRUPT_DATA);
224 if (!status) {
225 /* Release the bus */
226 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
227 return -ETIMEDOUT;
228 }
229 debug("Read %d bytes\n",
230 length - readl(&zynq_i2c->transfer_size));
231 for (; i < length - readl(&zynq_i2c->transfer_size); i++)
232 *(cur_data++) = readl(&zynq_i2c->data);
233 } while (readl(&zynq_i2c->transfer_size) != 0);
234 /* All done... release the bus */
235 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
236
237#ifdef DEBUG
238 zynq_i2c_debug_status();
239#endif
240 return 0;
241}
242
243/*
244 * I2C write called by cmd_i2c when doing 'i2c write' and by cmd_eeprom.c
245 * Begin write, send address byte(s), send data bytes, end.
246 */
Heiko Schocher465819a2013-11-08 07:30:53 +0100247static int zynq_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
248 int alen, u8 *data, int length)
Michal Simekbeedbcf2013-04-22 15:21:33 +0200249{
250 u8 *cur_data = data;
Michael Burr91fae472014-01-22 09:46:08 +0100251 struct zynq_i2c_registers *zynq_i2c = i2c_select(adap);
Michal Simekbeedbcf2013-04-22 15:21:33 +0200252
253 /* Write the register address */
254 setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
255 ZYNQ_I2C_CONTROL_HOLD);
256 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW);
257 writel(0xFF, &zynq_i2c->interrupt_status);
Michal Simekbeedbcf2013-04-22 15:21:33 +0200258 writel(dev, &zynq_i2c->address);
Michael Burrd7de1892014-01-22 09:46:07 +0100259 if (alen) {
260 while (alen--)
261 writel(addr >> (8 * alen), &zynq_i2c->data);
262 /* Start the tranfer */
Michael Burr91fae472014-01-22 09:46:08 +0100263 if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
Michael Burrd7de1892014-01-22 09:46:07 +0100264 /* Release the bus */
265 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
266 return -ETIMEDOUT;
267 }
268 debug("Device acked address\n");
Michal Simekbeedbcf2013-04-22 15:21:33 +0200269 }
270
Michal Simekbeedbcf2013-04-22 15:21:33 +0200271 while (length--) {
272 writel(*(cur_data++), &zynq_i2c->data);
273 if (readl(&zynq_i2c->transfer_size) == ZYNQ_I2C_FIFO_DEPTH) {
Michael Burr91fae472014-01-22 09:46:08 +0100274 if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP)) {
Michal Simekbeedbcf2013-04-22 15:21:33 +0200275 /* Release the bus */
276 clrbits_le32(&zynq_i2c->control,
277 ZYNQ_I2C_CONTROL_HOLD);
278 return -ETIMEDOUT;
279 }
280 }
281 }
282
283 /* All done... release the bus */
284 clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
285 /* Wait for the address and data to be sent */
Michael Burr91fae472014-01-22 09:46:08 +0100286 if (!zynq_i2c_wait(zynq_i2c, ZYNQ_I2C_INTERRUPT_COMP))
Michal Simekbeedbcf2013-04-22 15:21:33 +0200287 return -ETIMEDOUT;
288 return 0;
289}
290
Heiko Schocher465819a2013-11-08 07:30:53 +0100291static unsigned int zynq_i2c_set_bus_speed(struct i2c_adapter *adap,
292 unsigned int speed)
Michal Simekbeedbcf2013-04-22 15:21:33 +0200293{
Heiko Schocher465819a2013-11-08 07:30:53 +0100294 if (speed != 1000000)
295 return -EINVAL;
Michal Simekbeedbcf2013-04-22 15:21:33 +0200296
Michal Simekbeedbcf2013-04-22 15:21:33 +0200297 return 0;
298}
Heiko Schocher465819a2013-11-08 07:30:53 +0100299
300U_BOOT_I2C_ADAP_COMPLETE(zynq_0, zynq_i2c_init, zynq_i2c_probe, zynq_i2c_read,
301 zynq_i2c_write, zynq_i2c_set_bus_speed,
302 CONFIG_SYS_I2C_ZYNQ_SPEED, CONFIG_SYS_I2C_ZYNQ_SLAVE,
303 0)
Michael Burr91fae472014-01-22 09:46:08 +0100304U_BOOT_I2C_ADAP_COMPLETE(zynq_1, zynq_i2c_init, zynq_i2c_probe, zynq_i2c_read,
305 zynq_i2c_write, zynq_i2c_set_bus_speed,
306 CONFIG_SYS_I2C_ZYNQ_SPEED, CONFIG_SYS_I2C_ZYNQ_SLAVE,
307 1)