Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * i2c-au1550.c: SMBus (i2c) adapter for Alchemy PSC interface |
| 3 | * Copyright (C) 2004 Embedded Edge, LLC <dan@embeddededge.com> |
| 4 | * |
| 5 | * 2.6 port by Matt Porter <mporter@kernel.crashing.org> |
| 6 | * |
| 7 | * The documentation describes this as an SMBus controller, but it doesn't |
| 8 | * understand any of the SMBus protocol in hardware. It's really an I2C |
| 9 | * controller that could emulate most of the SMBus in software. |
| 10 | * |
| 11 | * This is just a skeleton adapter to use with the Au1550 PSC |
| 12 | * algorithm. It was developed for the Pb1550, but will work with |
| 13 | * any Au1550 board that has a similar PSC configuration. |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License |
| 17 | * as published by the Free Software Foundation; either version 2 |
| 18 | * of the License, or (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program; if not, write to the Free Software |
| 27 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/delay.h> |
| 31 | #include <linux/kernel.h> |
| 32 | #include <linux/module.h> |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 33 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/init.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/i2c.h> |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 37 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Manuel Lauss | 50d5676 | 2011-08-12 11:39:43 +0200 | [diff] [blame] | 39 | #include <asm/mach-au1x00/au1000.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/mach-au1x00/au1xxx_psc.h> |
| 41 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 42 | #define PSC_SEL 0x00 |
| 43 | #define PSC_CTRL 0x04 |
| 44 | #define PSC_SMBCFG 0x08 |
| 45 | #define PSC_SMBMSK 0x0C |
| 46 | #define PSC_SMBPCR 0x10 |
| 47 | #define PSC_SMBSTAT 0x14 |
| 48 | #define PSC_SMBEVNT 0x18 |
| 49 | #define PSC_SMBTXRX 0x1C |
| 50 | #define PSC_SMBTMR 0x20 |
| 51 | |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 52 | struct i2c_au1550_data { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 53 | void __iomem *psc_base; |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 54 | int xfer_timeout; |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 55 | struct i2c_adapter adap; |
| 56 | struct resource *ioarea; |
| 57 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 59 | static inline void WR(struct i2c_au1550_data *a, int r, unsigned long v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 61 | __raw_writel(v, a->psc_base + r); |
| 62 | wmb(); |
| 63 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 65 | static inline unsigned long RD(struct i2c_au1550_data *a, int r) |
| 66 | { |
| 67 | return __raw_readl(a->psc_base + r); |
| 68 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 70 | static int wait_xfer_done(struct i2c_au1550_data *adap) |
| 71 | { |
| 72 | int i; |
| 73 | |
| 74 | /* Wait for Tx Buffer Empty */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | for (i = 0; i < adap->xfer_timeout; i++) { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 76 | if (RD(adap, PSC_SMBSTAT) & PSC_SMBSTAT_TE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | return 0; |
Chris David | a202707 | 2007-10-13 23:56:33 +0200 | [diff] [blame] | 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | udelay(1); |
| 80 | } |
| 81 | |
| 82 | return -ETIMEDOUT; |
| 83 | } |
| 84 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 85 | static int wait_ack(struct i2c_au1550_data *adap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 87 | unsigned long stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | if (wait_xfer_done(adap)) |
| 90 | return -ETIMEDOUT; |
| 91 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 92 | stat = RD(adap, PSC_SMBEVNT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | if ((stat & (PSC_SMBEVNT_DN | PSC_SMBEVNT_AN | PSC_SMBEVNT_AL)) != 0) |
| 94 | return -ETIMEDOUT; |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 99 | static int wait_master_done(struct i2c_au1550_data *adap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 101 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 103 | /* Wait for Master Done. */ |
Manuel Lauss | 84785f1 | 2011-10-22 13:34:38 +0200 | [diff] [blame] | 104 | for (i = 0; i < 2 * adap->xfer_timeout; i++) { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 105 | if ((RD(adap, PSC_SMBEVNT) & PSC_SMBEVNT_MD) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | return 0; |
| 107 | udelay(1); |
| 108 | } |
| 109 | |
| 110 | return -ETIMEDOUT; |
| 111 | } |
| 112 | |
| 113 | static int |
Manuel Lauss | 91f2795 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 114 | do_address(struct i2c_au1550_data *adap, unsigned int addr, int rd, int q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 116 | unsigned long stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 118 | /* Reset the FIFOs, clear events. */ |
| 119 | stat = RD(adap, PSC_SMBSTAT); |
| 120 | WR(adap, PSC_SMBEVNT, PSC_SMBEVNT_ALLCLR); |
Domen Puncer | 8859942 | 2006-08-13 23:35:40 +0200 | [diff] [blame] | 121 | |
| 122 | if (!(stat & PSC_SMBSTAT_TE) || !(stat & PSC_SMBSTAT_RE)) { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 123 | WR(adap, PSC_SMBPCR, PSC_SMBPCR_DC); |
| 124 | while ((RD(adap, PSC_SMBPCR) & PSC_SMBPCR_DC) != 0) |
| 125 | cpu_relax(); |
Domen Puncer | 8859942 | 2006-08-13 23:35:40 +0200 | [diff] [blame] | 126 | udelay(50); |
| 127 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 129 | /* Write out the i2c chip address and specify operation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | addr <<= 1; |
| 131 | if (rd) |
| 132 | addr |= 1; |
| 133 | |
Manuel Lauss | 91f2795 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 134 | /* zero-byte xfers stop immediately */ |
| 135 | if (q) |
| 136 | addr |= PSC_SMBTXRX_STP; |
| 137 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 138 | /* Put byte into fifo, start up master. */ |
| 139 | WR(adap, PSC_SMBTXRX, addr); |
| 140 | WR(adap, PSC_SMBPCR, PSC_SMBPCR_MS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | if (wait_ack(adap)) |
| 142 | return -EIO; |
Manuel Lauss | 91f2795 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 143 | return (q) ? wait_master_done(adap) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 146 | static int wait_for_rx_byte(struct i2c_au1550_data *adap, unsigned char *out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 148 | int j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if (wait_xfer_done(adap)) |
| 151 | return -EIO; |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | j = adap->xfer_timeout * 100; |
| 154 | do { |
| 155 | j--; |
| 156 | if (j <= 0) |
| 157 | return -EIO; |
| 158 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 159 | if ((RD(adap, PSC_SMBSTAT) & PSC_SMBSTAT_RE) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | j = 0; |
| 161 | else |
| 162 | udelay(1); |
| 163 | } while (j > 0); |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 164 | |
| 165 | *out = RD(adap, PSC_SMBTXRX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 170 | static int i2c_read(struct i2c_au1550_data *adap, unsigned char *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | unsigned int len) |
| 172 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 173 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
| 175 | if (len == 0) |
| 176 | return 0; |
| 177 | |
| 178 | /* A read is performed by stuffing the transmit fifo with |
| 179 | * zero bytes for timing, waiting for bytes to appear in the |
| 180 | * receive fifo, then reading the bytes. |
| 181 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | i = 0; |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 183 | while (i < (len - 1)) { |
| 184 | WR(adap, PSC_SMBTXRX, 0); |
| 185 | if (wait_for_rx_byte(adap, &buf[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return -EIO; |
| 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | i++; |
| 189 | } |
| 190 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 191 | /* The last byte has to indicate transfer done. */ |
| 192 | WR(adap, PSC_SMBTXRX, PSC_SMBTXRX_STP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | if (wait_master_done(adap)) |
| 194 | return -EIO; |
| 195 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 196 | buf[i] = (unsigned char)(RD(adap, PSC_SMBTXRX) & 0xff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | return 0; |
| 198 | } |
| 199 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 200 | static int i2c_write(struct i2c_au1550_data *adap, unsigned char *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | unsigned int len) |
| 202 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 203 | int i; |
| 204 | unsigned long data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | if (len == 0) |
| 207 | return 0; |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | i = 0; |
| 210 | while (i < (len-1)) { |
| 211 | data = buf[i]; |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 212 | WR(adap, PSC_SMBTXRX, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | if (wait_ack(adap)) |
| 214 | return -EIO; |
| 215 | i++; |
| 216 | } |
| 217 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 218 | /* The last byte has to indicate transfer done. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | data = buf[i]; |
| 220 | data |= PSC_SMBTXRX_STP; |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 221 | WR(adap, PSC_SMBTXRX, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | if (wait_master_done(adap)) |
| 223 | return -EIO; |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static int |
| 228 | au1550_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) |
| 229 | { |
| 230 | struct i2c_au1550_data *adap = i2c_adap->algo_data; |
| 231 | struct i2c_msg *p; |
| 232 | int i, err = 0; |
| 233 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 234 | WR(adap, PSC_CTRL, PSC_CTRL_ENABLE); |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | for (i = 0; !err && i < num; i++) { |
| 237 | p = &msgs[i]; |
Manuel Lauss | 91f2795 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 238 | err = do_address(adap, p->addr, p->flags & I2C_M_RD, |
| 239 | (p->len == 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (err || !p->len) |
| 241 | continue; |
| 242 | if (p->flags & I2C_M_RD) |
| 243 | err = i2c_read(adap, p->buf, p->len); |
| 244 | else |
| 245 | err = i2c_write(adap, p->buf, p->len); |
| 246 | } |
| 247 | |
| 248 | /* Return the number of messages processed, or the error code. |
| 249 | */ |
| 250 | if (err == 0) |
| 251 | err = num; |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 252 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 253 | WR(adap, PSC_CTRL, PSC_CTRL_SUSPEND); |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | return err; |
| 256 | } |
| 257 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 258 | static u32 au1550_func(struct i2c_adapter *adap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | { |
Domen Puncer | 6ed0713 | 2006-08-13 23:36:27 +0200 | [diff] [blame] | 260 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
| 262 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 263 | static const struct i2c_algorithm au1550_algo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | .master_xfer = au1550_xfer, |
| 265 | .functionality = au1550_func, |
| 266 | }; |
| 267 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 268 | static void i2c_au1550_setup(struct i2c_au1550_data *priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 270 | unsigned long cfg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 272 | WR(priv, PSC_CTRL, PSC_CTRL_DISABLE); |
| 273 | WR(priv, PSC_SEL, PSC_SEL_PS_SMBUSMODE); |
| 274 | WR(priv, PSC_SMBCFG, 0); |
| 275 | WR(priv, PSC_CTRL, PSC_CTRL_ENABLE); |
| 276 | while ((RD(priv, PSC_SMBSTAT) & PSC_SMBSTAT_SR) == 0) |
| 277 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 279 | cfg = PSC_SMBCFG_RT_FIFO8 | PSC_SMBCFG_TT_FIFO8 | PSC_SMBCFG_DD_DISABLE; |
| 280 | WR(priv, PSC_SMBCFG, cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | /* Divide by 8 to get a 6.25 MHz clock. The later protocol |
| 283 | * timings are based on this clock. |
| 284 | */ |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 285 | cfg |= PSC_SMBCFG_SET_DIV(PSC_SMBCFG_DIV8); |
| 286 | WR(priv, PSC_SMBCFG, cfg); |
| 287 | WR(priv, PSC_SMBMSK, PSC_SMBMSK_ALLMASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | /* Set the protocol timer values. See Table 71 in the |
| 290 | * Au1550 Data Book for standard timing values. |
| 291 | */ |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 292 | WR(priv, PSC_SMBTMR, PSC_SMBTMR_SET_TH(0) | PSC_SMBTMR_SET_PS(15) | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | PSC_SMBTMR_SET_PU(15) | PSC_SMBTMR_SET_SH(15) | \ |
| 294 | PSC_SMBTMR_SET_SU(15) | PSC_SMBTMR_SET_CL(15) | \ |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 295 | PSC_SMBTMR_SET_CH(15)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 297 | cfg |= PSC_SMBCFG_DE_ENABLE; |
| 298 | WR(priv, PSC_SMBCFG, cfg); |
| 299 | while ((RD(priv, PSC_SMBSTAT) & PSC_SMBSTAT_SR) == 0) |
| 300 | cpu_relax(); |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 301 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 302 | WR(priv, PSC_CTRL, PSC_CTRL_SUSPEND); |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | static void i2c_au1550_disable(struct i2c_au1550_data *priv) |
| 306 | { |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 307 | WR(priv, PSC_SMBCFG, 0); |
| 308 | WR(priv, PSC_CTRL, PSC_CTRL_DISABLE); |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 309 | } |
| 310 | |
| 311 | /* |
| 312 | * registering functions to load algorithms at runtime |
| 313 | * Prior to calling us, the 50MHz clock frequency and routing |
| 314 | * must have been set up for the PSC indicated by the adapter. |
| 315 | */ |
| 316 | static int __devinit |
| 317 | i2c_au1550_probe(struct platform_device *pdev) |
| 318 | { |
| 319 | struct i2c_au1550_data *priv; |
| 320 | struct resource *r; |
| 321 | int ret; |
| 322 | |
| 323 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 324 | if (!r) { |
| 325 | ret = -ENODEV; |
| 326 | goto out; |
| 327 | } |
| 328 | |
| 329 | priv = kzalloc(sizeof(struct i2c_au1550_data), GFP_KERNEL); |
| 330 | if (!priv) { |
| 331 | ret = -ENOMEM; |
| 332 | goto out; |
| 333 | } |
| 334 | |
Linus Walleij | c6ffdde | 2009-06-14 00:20:36 +0200 | [diff] [blame] | 335 | priv->ioarea = request_mem_region(r->start, resource_size(r), |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 336 | pdev->name); |
| 337 | if (!priv->ioarea) { |
| 338 | ret = -EBUSY; |
| 339 | goto out_mem; |
| 340 | } |
| 341 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 342 | priv->psc_base = ioremap(r->start, resource_size(r)); |
| 343 | if (!priv->psc_base) { |
| 344 | ret = -EIO; |
| 345 | goto out_map; |
| 346 | } |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 347 | priv->xfer_timeout = 200; |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 348 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 349 | priv->adap.nr = pdev->id; |
| 350 | priv->adap.algo = &au1550_algo; |
| 351 | priv->adap.algo_data = priv; |
| 352 | priv->adap.dev.parent = &pdev->dev; |
| 353 | strlcpy(priv->adap.name, "Au1xxx PSC I2C", sizeof(priv->adap.name)); |
| 354 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 355 | /* Now, set up the PSC for SMBus PIO mode. */ |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 356 | i2c_au1550_setup(priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 358 | ret = i2c_add_numbered_adapter(&priv->adap); |
| 359 | if (ret == 0) { |
| 360 | platform_set_drvdata(pdev, priv); |
| 361 | return 0; |
| 362 | } |
| 363 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 364 | i2c_au1550_disable(priv); |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 365 | iounmap(priv->psc_base); |
| 366 | out_map: |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 367 | release_resource(priv->ioarea); |
| 368 | kfree(priv->ioarea); |
| 369 | out_mem: |
| 370 | kfree(priv); |
| 371 | out: |
| 372 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 375 | static int __devexit i2c_au1550_remove(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 377 | struct i2c_au1550_data *priv = platform_get_drvdata(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 379 | platform_set_drvdata(pdev, NULL); |
| 380 | i2c_del_adapter(&priv->adap); |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 381 | i2c_au1550_disable(priv); |
Manuel Lauss | c5de646 | 2011-10-22 13:34:36 +0200 | [diff] [blame] | 382 | iounmap(priv->psc_base); |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 383 | release_resource(priv->ioarea); |
| 384 | kfree(priv->ioarea); |
| 385 | kfree(priv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | return 0; |
| 387 | } |
| 388 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 389 | #ifdef CONFIG_PM |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 390 | static int i2c_au1550_suspend(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | { |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 392 | struct i2c_au1550_data *priv = dev_get_drvdata(dev); |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 393 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 394 | i2c_au1550_disable(priv); |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | return 0; |
| 397 | } |
| 398 | |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 399 | static int i2c_au1550_resume(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | { |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 401 | struct i2c_au1550_data *priv = dev_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 403 | i2c_au1550_setup(priv); |
| 404 | |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 405 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 407 | |
| 408 | static const struct dev_pm_ops i2c_au1550_pmops = { |
| 409 | .suspend = i2c_au1550_suspend, |
| 410 | .resume = i2c_au1550_resume, |
| 411 | }; |
| 412 | |
| 413 | #define AU1XPSC_SMBUS_PMOPS (&i2c_au1550_pmops) |
| 414 | |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 415 | #else |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 416 | #define AU1XPSC_SMBUS_PMOPS NULL |
Manuel Lauss | f09f71b | 2008-07-14 22:38:34 +0200 | [diff] [blame] | 417 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 419 | static struct platform_driver au1xpsc_smbus_driver = { |
| 420 | .driver = { |
| 421 | .name = "au1xpsc_smbus", |
| 422 | .owner = THIS_MODULE, |
Manuel Lauss | 46f344e2 | 2011-10-22 13:34:39 +0200 | [diff] [blame] | 423 | .pm = AU1XPSC_SMBUS_PMOPS, |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 424 | }, |
| 425 | .probe = i2c_au1550_probe, |
| 426 | .remove = __devexit_p(i2c_au1550_remove), |
Manuel Lauss | 8b798c4 | 2008-01-27 18:14:52 +0100 | [diff] [blame] | 427 | }; |
| 428 | |
Axel Lin | a3664b5 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 429 | module_platform_driver(au1xpsc_smbus_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | MODULE_AUTHOR("Dan Malek, Embedded Edge, LLC."); |
| 432 | MODULE_DESCRIPTION("SMBus adapter Alchemy pb1550"); |
| 433 | MODULE_LICENSE("GPL"); |
Kay Sievers | add8eda | 2008-04-22 22:16:49 +0200 | [diff] [blame] | 434 | MODULE_ALIAS("platform:au1xpsc_smbus"); |