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9a58a333 SD |
1 | /* |
2 | * intel_scu_ipc.c: Driver for the Intel SCU IPC mechanism | |
3 | * | |
7c2e3c74 | 4 | * (C) Copyright 2008-2010,2015 Intel Corporation |
9a58a333 SD |
5 | * Author: Sreedhara DS (sreedhara.ds@intel.com) |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; version 2 | |
10 | * of the License. | |
11 | * | |
c8440336 | 12 | * SCU running in ARC processor communicates with other entity running in IA |
9a58a333 SD |
13 | * core through IPC mechanism which in turn messaging between IA core ad SCU. |
14 | * SCU has two IPC mechanism IPC-1 and IPC-2. IPC-1 is used between IA32 and | |
15 | * SCU where IPC-2 is used between P-Unit and SCU. This driver delas with | |
16 | * IPC-1 Driver provides an API for power control unit registers (e.g. MSIC) | |
17 | * along with other APIs. | |
18 | */ | |
19 | #include <linux/delay.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/init.h> | |
edbaa603 | 22 | #include <linux/device.h> |
9a58a333 SD |
23 | #include <linux/pm.h> |
24 | #include <linux/pci.h> | |
25 | #include <linux/interrupt.h> | |
209009b2 | 26 | #include <linux/sfi.h> |
05454c26 | 27 | #include <asm/intel-mid.h> |
9a58a333 SD |
28 | #include <asm/intel_scu_ipc.h> |
29 | ||
30 | /* IPC defines the following message types */ | |
31 | #define IPCMSG_WATCHDOG_TIMER 0xF8 /* Set Kernel Watchdog Threshold */ | |
32 | #define IPCMSG_BATTERY 0xEF /* Coulomb Counter Accumulator */ | |
33 | #define IPCMSG_FW_UPDATE 0xFE /* Firmware update */ | |
34 | #define IPCMSG_PCNTRL 0xFF /* Power controller unit read/write */ | |
35 | #define IPCMSG_FW_REVISION 0xF4 /* Get firmware revision */ | |
36 | ||
37 | /* Command id associated with message IPCMSG_PCNTRL */ | |
38 | #define IPC_CMD_PCNTRL_W 0 /* Register write */ | |
39 | #define IPC_CMD_PCNTRL_R 1 /* Register read */ | |
40 | #define IPC_CMD_PCNTRL_M 2 /* Register read-modify-write */ | |
41 | ||
9a58a333 SD |
42 | /* |
43 | * IPC register summary | |
44 | * | |
32d0e4a3 | 45 | * IPC register blocks are memory mapped at fixed address of PCI BAR 0. |
9a58a333 | 46 | * To read or write information to the SCU, driver writes to IPC-1 memory |
32d0e4a3 | 47 | * mapped registers. The following is the IPC mechanism |
9a58a333 SD |
48 | * |
49 | * 1. IA core cDMI interface claims this transaction and converts it to a | |
50 | * Transaction Layer Packet (TLP) message which is sent across the cDMI. | |
51 | * | |
52 | * 2. South Complex cDMI block receives this message and writes it to | |
53 | * the IPC-1 register block, causing an interrupt to the SCU | |
54 | * | |
55 | * 3. SCU firmware decodes this interrupt and IPC message and the appropriate | |
56 | * message handler is called within firmware. | |
57 | */ | |
58 | ||
51cd525d AV |
59 | #define IPC_WWBUF_SIZE 20 /* IPC Write buffer Size */ |
60 | #define IPC_RWBUF_SIZE 20 /* IPC Read buffer Size */ | |
ed12f295 | 61 | #define IPC_IOC 0x100 /* IPC command register IOC bit */ |
e97a1c98 | 62 | |
b4b0b4a9 DC |
63 | #define PCI_DEVICE_ID_LINCROFT 0x082a |
64 | #define PCI_DEVICE_ID_PENWELL 0x080e | |
65 | #define PCI_DEVICE_ID_CLOVERVIEW 0x08ea | |
66 | #define PCI_DEVICE_ID_TANGIER 0x11a0 | |
67 | ||
7c2e3c74 | 68 | /* intel scu ipc driver data */ |
e97a1c98 | 69 | struct intel_scu_ipc_pdata_t { |
e97a1c98 | 70 | u32 i2c_base; |
e97a1c98 | 71 | u32 i2c_len; |
ed12f295 | 72 | u8 irq_mode; |
e97a1c98 KS |
73 | }; |
74 | ||
694e523c | 75 | static struct intel_scu_ipc_pdata_t intel_scu_ipc_lincroft_pdata = { |
694e523c | 76 | .i2c_base = 0xff12b000, |
694e523c DC |
77 | .i2c_len = 0x10, |
78 | .irq_mode = 0, | |
79 | }; | |
80 | ||
81 | /* Penwell and Cloverview */ | |
82 | static struct intel_scu_ipc_pdata_t intel_scu_ipc_penwell_pdata = { | |
694e523c | 83 | .i2c_base = 0xff12b000, |
694e523c DC |
84 | .i2c_len = 0x10, |
85 | .irq_mode = 1, | |
86 | }; | |
87 | ||
88 | static struct intel_scu_ipc_pdata_t intel_scu_ipc_tangier_pdata = { | |
694e523c | 89 | .i2c_base = 0xff00d000, |
694e523c DC |
90 | .i2c_len = 0x10, |
91 | .irq_mode = 0, | |
e97a1c98 | 92 | }; |
9a58a333 | 93 | |
9a58a333 | 94 | struct intel_scu_ipc_dev { |
20903169 | 95 | struct device *dev; |
9a58a333 SD |
96 | void __iomem *ipc_base; |
97 | void __iomem *i2c_base; | |
ed12f295 KS |
98 | struct completion cmd_complete; |
99 | u8 irq_mode; | |
9a58a333 SD |
100 | }; |
101 | ||
102 | static struct intel_scu_ipc_dev ipcdev; /* Only one for now */ | |
103 | ||
9a58a333 SD |
104 | /* |
105 | * IPC Read Buffer (Read Only): | |
106 | * 16 byte buffer for receiving data from SCU, if IPC command | |
107 | * processing results in response data | |
108 | */ | |
109 | #define IPC_READ_BUFFER 0x90 | |
110 | ||
111 | #define IPC_I2C_CNTRL_ADDR 0 | |
112 | #define I2C_DATA_ADDR 0x04 | |
113 | ||
114 | static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */ | |
115 | ||
116 | /* | |
b0b3f578 | 117 | * Send ipc command |
9a58a333 SD |
118 | * Command Register (Write Only): |
119 | * A write to this register results in an interrupt to the SCU core processor | |
120 | * Format: | |
121 | * |rfu2(8) | size(8) | command id(4) | rfu1(3) | ioc(1) | command(8)| | |
122 | */ | |
b0b3f578 | 123 | static inline void ipc_command(struct intel_scu_ipc_dev *scu, u32 cmd) |
9a58a333 | 124 | { |
b0b3f578 AS |
125 | if (scu->irq_mode) { |
126 | reinit_completion(&scu->cmd_complete); | |
127 | writel(cmd | IPC_IOC, scu->ipc_base); | |
ed12f295 | 128 | } |
b0b3f578 | 129 | writel(cmd, scu->ipc_base); |
9a58a333 SD |
130 | } |
131 | ||
132 | /* | |
b0b3f578 | 133 | * Write ipc data |
9a58a333 SD |
134 | * IPC Write Buffer (Write Only): |
135 | * 16-byte buffer for sending data associated with IPC command to | |
136 | * SCU. Size of the data is specified in the IPC_COMMAND_REG register | |
137 | */ | |
b0b3f578 | 138 | static inline void ipc_data_writel(struct intel_scu_ipc_dev *scu, u32 data, u32 offset) |
9a58a333 | 139 | { |
b0b3f578 | 140 | writel(data, scu->ipc_base + 0x80 + offset); |
9a58a333 SD |
141 | } |
142 | ||
9a58a333 SD |
143 | /* |
144 | * Status Register (Read Only): | |
145 | * Driver will read this register to get the ready/busy status of the IPC | |
146 | * block and error status of the IPC command that was just processed by SCU | |
147 | * Format: | |
148 | * |rfu3(8)|error code(8)|initiator id(8)|cmd id(4)|rfu1(2)|error(1)|busy(1)| | |
149 | */ | |
b0b3f578 | 150 | static inline u8 ipc_read_status(struct intel_scu_ipc_dev *scu) |
9a58a333 | 151 | { |
b0b3f578 | 152 | return __raw_readl(scu->ipc_base + 0x04); |
9a58a333 SD |
153 | } |
154 | ||
b0b3f578 AS |
155 | /* Read ipc byte data */ |
156 | static inline u8 ipc_data_readb(struct intel_scu_ipc_dev *scu, u32 offset) | |
9a58a333 | 157 | { |
b0b3f578 | 158 | return readb(scu->ipc_base + IPC_READ_BUFFER + offset); |
9a58a333 SD |
159 | } |
160 | ||
b0b3f578 AS |
161 | /* Read ipc u32 data */ |
162 | static inline u32 ipc_data_readl(struct intel_scu_ipc_dev *scu, u32 offset) | |
9a58a333 | 163 | { |
b0b3f578 | 164 | return readl(scu->ipc_base + IPC_READ_BUFFER + offset); |
9a58a333 SD |
165 | } |
166 | ||
7c2e3c74 | 167 | /* Wait till scu status is busy */ |
b0b3f578 | 168 | static inline int busy_loop(struct intel_scu_ipc_dev *scu) |
9a58a333 | 169 | { |
b0b3f578 | 170 | u32 status = ipc_read_status(scu); |
f0295a36 | 171 | u32 loop_count = 100000; |
9a58a333 | 172 | |
f0295a36 AS |
173 | /* break if scu doesn't reset busy bit after huge retry */ |
174 | while ((status & BIT(0)) && --loop_count) { | |
9a58a333 | 175 | udelay(1); /* scu processing time is in few u secods */ |
b0b3f578 | 176 | status = ipc_read_status(scu); |
9a58a333 | 177 | } |
f0295a36 AS |
178 | |
179 | if (status & BIT(0)) { | |
20903169 | 180 | dev_err(scu->dev, "IPC timed out"); |
f0295a36 AS |
181 | return -ETIMEDOUT; |
182 | } | |
183 | ||
184 | if (status & BIT(1)) | |
77e01d6d HL |
185 | return -EIO; |
186 | ||
187 | return 0; | |
9a58a333 SD |
188 | } |
189 | ||
ed12f295 | 190 | /* Wait till ipc ioc interrupt is received or timeout in 3 HZ */ |
b0b3f578 | 191 | static inline int ipc_wait_for_interrupt(struct intel_scu_ipc_dev *scu) |
ed12f295 KS |
192 | { |
193 | int status; | |
194 | ||
b0b3f578 | 195 | if (!wait_for_completion_timeout(&scu->cmd_complete, 3 * HZ)) { |
20903169 | 196 | dev_err(scu->dev, "IPC timed out\n"); |
ed12f295 KS |
197 | return -ETIMEDOUT; |
198 | } | |
199 | ||
b0b3f578 | 200 | status = ipc_read_status(scu); |
f0295a36 | 201 | if (status & BIT(1)) |
ed12f295 KS |
202 | return -EIO; |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
b0b3f578 | 207 | static int intel_scu_ipc_check_status(struct intel_scu_ipc_dev *scu) |
ed12f295 | 208 | { |
b0b3f578 | 209 | return scu->irq_mode ? ipc_wait_for_interrupt(scu) : busy_loop(scu); |
ed12f295 KS |
210 | } |
211 | ||
9a58a333 SD |
212 | /* Read/Write power control(PMIC in Langwell, MSIC in PenWell) registers */ |
213 | static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id) | |
214 | { | |
b0b3f578 | 215 | struct intel_scu_ipc_dev *scu = &ipcdev; |
4707375f | 216 | int nc; |
9a58a333 | 217 | u32 offset = 0; |
ecb5646c | 218 | int err; |
8642d7f8 | 219 | u8 cbuf[IPC_WWBUF_SIZE]; |
9a58a333 SD |
220 | u32 *wbuf = (u32 *)&cbuf; |
221 | ||
ed6f2b4d AV |
222 | memset(cbuf, 0, sizeof(cbuf)); |
223 | ||
8642d7f8 CJ |
224 | mutex_lock(&ipclock); |
225 | ||
20903169 | 226 | if (scu->dev == NULL) { |
9a58a333 SD |
227 | mutex_unlock(&ipclock); |
228 | return -ENODEV; | |
229 | } | |
230 | ||
4707375f AC |
231 | for (nc = 0; nc < count; nc++, offset += 2) { |
232 | cbuf[offset] = addr[nc]; | |
233 | cbuf[offset + 1] = addr[nc] >> 8; | |
234 | } | |
9a58a333 | 235 | |
4707375f AC |
236 | if (id == IPC_CMD_PCNTRL_R) { |
237 | for (nc = 0, offset = 0; nc < count; nc++, offset += 4) | |
b0b3f578 AS |
238 | ipc_data_writel(scu, wbuf[nc], offset); |
239 | ipc_command(scu, (count * 2) << 16 | id << 12 | 0 << 8 | op); | |
4707375f AC |
240 | } else if (id == IPC_CMD_PCNTRL_W) { |
241 | for (nc = 0; nc < count; nc++, offset += 1) | |
242 | cbuf[offset] = data[nc]; | |
243 | for (nc = 0, offset = 0; nc < count; nc++, offset += 4) | |
b0b3f578 AS |
244 | ipc_data_writel(scu, wbuf[nc], offset); |
245 | ipc_command(scu, (count * 3) << 16 | id << 12 | 0 << 8 | op); | |
4707375f AC |
246 | } else if (id == IPC_CMD_PCNTRL_M) { |
247 | cbuf[offset] = data[0]; | |
248 | cbuf[offset + 1] = data[1]; | |
b0b3f578 AS |
249 | ipc_data_writel(scu, wbuf[0], 0); /* Write wbuff */ |
250 | ipc_command(scu, 4 << 16 | id << 12 | 0 << 8 | op); | |
e3359fd5 | 251 | } |
9a58a333 | 252 | |
b0b3f578 | 253 | err = intel_scu_ipc_check_status(scu); |
c7094d1d | 254 | if (!err && id == IPC_CMD_PCNTRL_R) { /* Read rbuf */ |
9a58a333 | 255 | /* Workaround: values are read as 0 without memcpy_fromio */ |
b0b3f578 | 256 | memcpy_fromio(cbuf, scu->ipc_base + 0x90, 16); |
4707375f | 257 | for (nc = 0; nc < count; nc++) |
b0b3f578 | 258 | data[nc] = ipc_data_readb(scu, nc); |
9a58a333 SD |
259 | } |
260 | mutex_unlock(&ipclock); | |
261 | return err; | |
262 | } | |
263 | ||
264 | /** | |
265 | * intel_scu_ipc_ioread8 - read a word via the SCU | |
266 | * @addr: register on SCU | |
267 | * @data: return pointer for read byte | |
268 | * | |
269 | * Read a single register. Returns 0 on success or an error code. All | |
270 | * locking between SCU accesses is handled for the caller. | |
271 | * | |
272 | * This function may sleep. | |
273 | */ | |
274 | int intel_scu_ipc_ioread8(u16 addr, u8 *data) | |
275 | { | |
276 | return pwr_reg_rdwr(&addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); | |
277 | } | |
278 | EXPORT_SYMBOL(intel_scu_ipc_ioread8); | |
279 | ||
280 | /** | |
281 | * intel_scu_ipc_ioread16 - read a word via the SCU | |
282 | * @addr: register on SCU | |
283 | * @data: return pointer for read word | |
284 | * | |
285 | * Read a register pair. Returns 0 on success or an error code. All | |
286 | * locking between SCU accesses is handled for the caller. | |
287 | * | |
288 | * This function may sleep. | |
289 | */ | |
290 | int intel_scu_ipc_ioread16(u16 addr, u16 *data) | |
291 | { | |
7c2e3c74 | 292 | u16 x[2] = {addr, addr + 1}; |
9a58a333 SD |
293 | return pwr_reg_rdwr(x, (u8 *)data, 2, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); |
294 | } | |
295 | EXPORT_SYMBOL(intel_scu_ipc_ioread16); | |
296 | ||
297 | /** | |
298 | * intel_scu_ipc_ioread32 - read a dword via the SCU | |
299 | * @addr: register on SCU | |
300 | * @data: return pointer for read dword | |
301 | * | |
302 | * Read four registers. Returns 0 on success or an error code. All | |
303 | * locking between SCU accesses is handled for the caller. | |
304 | * | |
305 | * This function may sleep. | |
306 | */ | |
307 | int intel_scu_ipc_ioread32(u16 addr, u32 *data) | |
308 | { | |
309 | u16 x[4] = {addr, addr + 1, addr + 2, addr + 3}; | |
310 | return pwr_reg_rdwr(x, (u8 *)data, 4, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); | |
311 | } | |
312 | EXPORT_SYMBOL(intel_scu_ipc_ioread32); | |
313 | ||
314 | /** | |
315 | * intel_scu_ipc_iowrite8 - write a byte via the SCU | |
316 | * @addr: register on SCU | |
317 | * @data: byte to write | |
318 | * | |
319 | * Write a single register. Returns 0 on success or an error code. All | |
320 | * locking between SCU accesses is handled for the caller. | |
321 | * | |
322 | * This function may sleep. | |
323 | */ | |
324 | int intel_scu_ipc_iowrite8(u16 addr, u8 data) | |
325 | { | |
326 | return pwr_reg_rdwr(&addr, &data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); | |
327 | } | |
328 | EXPORT_SYMBOL(intel_scu_ipc_iowrite8); | |
329 | ||
330 | /** | |
331 | * intel_scu_ipc_iowrite16 - write a word via the SCU | |
332 | * @addr: register on SCU | |
333 | * @data: word to write | |
334 | * | |
335 | * Write two registers. Returns 0 on success or an error code. All | |
336 | * locking between SCU accesses is handled for the caller. | |
337 | * | |
338 | * This function may sleep. | |
339 | */ | |
340 | int intel_scu_ipc_iowrite16(u16 addr, u16 data) | |
341 | { | |
7c2e3c74 | 342 | u16 x[2] = {addr, addr + 1}; |
9a58a333 SD |
343 | return pwr_reg_rdwr(x, (u8 *)&data, 2, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); |
344 | } | |
345 | EXPORT_SYMBOL(intel_scu_ipc_iowrite16); | |
346 | ||
347 | /** | |
348 | * intel_scu_ipc_iowrite32 - write a dword via the SCU | |
349 | * @addr: register on SCU | |
350 | * @data: dword to write | |
351 | * | |
352 | * Write four registers. Returns 0 on success or an error code. All | |
353 | * locking between SCU accesses is handled for the caller. | |
354 | * | |
355 | * This function may sleep. | |
356 | */ | |
357 | int intel_scu_ipc_iowrite32(u16 addr, u32 data) | |
358 | { | |
359 | u16 x[4] = {addr, addr + 1, addr + 2, addr + 3}; | |
360 | return pwr_reg_rdwr(x, (u8 *)&data, 4, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); | |
361 | } | |
362 | EXPORT_SYMBOL(intel_scu_ipc_iowrite32); | |
363 | ||
364 | /** | |
365 | * intel_scu_ipc_readvv - read a set of registers | |
366 | * @addr: register list | |
367 | * @data: bytes to return | |
368 | * @len: length of array | |
369 | * | |
370 | * Read registers. Returns 0 on success or an error code. All | |
371 | * locking between SCU accesses is handled for the caller. | |
372 | * | |
373 | * The largest array length permitted by the hardware is 5 items. | |
374 | * | |
375 | * This function may sleep. | |
376 | */ | |
377 | int intel_scu_ipc_readv(u16 *addr, u8 *data, int len) | |
378 | { | |
379 | return pwr_reg_rdwr(addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R); | |
380 | } | |
381 | EXPORT_SYMBOL(intel_scu_ipc_readv); | |
382 | ||
383 | /** | |
384 | * intel_scu_ipc_writev - write a set of registers | |
385 | * @addr: register list | |
386 | * @data: bytes to write | |
387 | * @len: length of array | |
388 | * | |
389 | * Write registers. Returns 0 on success or an error code. All | |
390 | * locking between SCU accesses is handled for the caller. | |
391 | * | |
392 | * The largest array length permitted by the hardware is 5 items. | |
393 | * | |
394 | * This function may sleep. | |
395 | * | |
396 | */ | |
397 | int intel_scu_ipc_writev(u16 *addr, u8 *data, int len) | |
398 | { | |
399 | return pwr_reg_rdwr(addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W); | |
400 | } | |
401 | EXPORT_SYMBOL(intel_scu_ipc_writev); | |
402 | ||
9a58a333 SD |
403 | /** |
404 | * intel_scu_ipc_update_register - r/m/w a register | |
405 | * @addr: register address | |
406 | * @bits: bits to update | |
407 | * @mask: mask of bits to update | |
408 | * | |
409 | * Read-modify-write power control unit register. The first data argument | |
410 | * must be register value and second is mask value | |
411 | * mask is a bitmap that indicates which bits to update. | |
412 | * 0 = masked. Don't modify this bit, 1 = modify this bit. | |
413 | * returns 0 on success or an error code. | |
414 | * | |
415 | * This function may sleep. Locking between SCU accesses is handled | |
416 | * for the caller. | |
417 | */ | |
418 | int intel_scu_ipc_update_register(u16 addr, u8 bits, u8 mask) | |
419 | { | |
420 | u8 data[2] = { bits, mask }; | |
421 | return pwr_reg_rdwr(&addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_M); | |
422 | } | |
423 | EXPORT_SYMBOL(intel_scu_ipc_update_register); | |
424 | ||
9a58a333 SD |
425 | /** |
426 | * intel_scu_ipc_simple_command - send a simple command | |
427 | * @cmd: command | |
428 | * @sub: sub type | |
429 | * | |
430 | * Issue a simple command to the SCU. Do not use this interface if | |
431 | * you must then access data as any data values may be overwritten | |
432 | * by another SCU access by the time this function returns. | |
433 | * | |
434 | * This function may sleep. Locking for SCU accesses is handled for | |
435 | * the caller. | |
436 | */ | |
437 | int intel_scu_ipc_simple_command(int cmd, int sub) | |
438 | { | |
b0b3f578 | 439 | struct intel_scu_ipc_dev *scu = &ipcdev; |
ecb5646c | 440 | int err; |
9a58a333 SD |
441 | |
442 | mutex_lock(&ipclock); | |
20903169 | 443 | if (scu->dev == NULL) { |
9a58a333 SD |
444 | mutex_unlock(&ipclock); |
445 | return -ENODEV; | |
446 | } | |
b0b3f578 AS |
447 | ipc_command(scu, sub << 12 | cmd); |
448 | err = intel_scu_ipc_check_status(scu); | |
9a58a333 SD |
449 | mutex_unlock(&ipclock); |
450 | return err; | |
451 | } | |
452 | EXPORT_SYMBOL(intel_scu_ipc_simple_command); | |
453 | ||
454 | /** | |
455 | * intel_scu_ipc_command - command with data | |
456 | * @cmd: command | |
457 | * @sub: sub type | |
458 | * @in: input data | |
b4fd4f89 | 459 | * @inlen: input length in dwords |
9a58a333 | 460 | * @out: output data |
b4fd4f89 | 461 | * @outlein: output length in dwords |
9a58a333 SD |
462 | * |
463 | * Issue a command to the SCU which involves data transfers. Do the | |
464 | * data copies under the lock but leave it for the caller to interpret | |
465 | */ | |
9a58a333 | 466 | int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen, |
7c2e3c74 | 467 | u32 *out, int outlen) |
9a58a333 | 468 | { |
b0b3f578 | 469 | struct intel_scu_ipc_dev *scu = &ipcdev; |
ecb5646c | 470 | int i, err; |
9a58a333 SD |
471 | |
472 | mutex_lock(&ipclock); | |
20903169 | 473 | if (scu->dev == NULL) { |
9a58a333 SD |
474 | mutex_unlock(&ipclock); |
475 | return -ENODEV; | |
476 | } | |
477 | ||
478 | for (i = 0; i < inlen; i++) | |
b0b3f578 | 479 | ipc_data_writel(scu, *in++, 4 * i); |
9a58a333 | 480 | |
b0b3f578 AS |
481 | ipc_command(scu, (inlen << 16) | (sub << 12) | cmd); |
482 | err = intel_scu_ipc_check_status(scu); | |
9a58a333 | 483 | |
c7094d1d KS |
484 | if (!err) { |
485 | for (i = 0; i < outlen; i++) | |
b0b3f578 | 486 | *out++ = ipc_data_readl(scu, 4 * i); |
c7094d1d | 487 | } |
9a58a333 SD |
488 | |
489 | mutex_unlock(&ipclock); | |
490 | return err; | |
491 | } | |
492 | EXPORT_SYMBOL(intel_scu_ipc_command); | |
493 | ||
7c2e3c74 | 494 | /* I2C commands */ |
9a58a333 SD |
495 | #define IPC_I2C_WRITE 1 /* I2C Write command */ |
496 | #define IPC_I2C_READ 2 /* I2C Read command */ | |
497 | ||
498 | /** | |
499 | * intel_scu_ipc_i2c_cntrl - I2C read/write operations | |
500 | * @addr: I2C address + command bits | |
501 | * @data: data to read/write | |
502 | * | |
503 | * Perform an an I2C read/write operation via the SCU. All locking is | |
504 | * handled for the caller. This function may sleep. | |
505 | * | |
506 | * Returns an error code or 0 on success. | |
507 | * | |
508 | * This has to be in the IPC driver for the locking. | |
509 | */ | |
510 | int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data) | |
511 | { | |
b0b3f578 | 512 | struct intel_scu_ipc_dev *scu = &ipcdev; |
9a58a333 SD |
513 | u32 cmd = 0; |
514 | ||
515 | mutex_lock(&ipclock); | |
20903169 | 516 | if (scu->dev == NULL) { |
b4fd4f89 SD |
517 | mutex_unlock(&ipclock); |
518 | return -ENODEV; | |
519 | } | |
9a58a333 SD |
520 | cmd = (addr >> 24) & 0xFF; |
521 | if (cmd == IPC_I2C_READ) { | |
b0b3f578 | 522 | writel(addr, scu->i2c_base + IPC_I2C_CNTRL_ADDR); |
9a58a333 SD |
523 | /* Write not getting updated without delay */ |
524 | mdelay(1); | |
b0b3f578 | 525 | *data = readl(scu->i2c_base + I2C_DATA_ADDR); |
9a58a333 | 526 | } else if (cmd == IPC_I2C_WRITE) { |
b0b3f578 | 527 | writel(*data, scu->i2c_base + I2C_DATA_ADDR); |
9a58a333 | 528 | mdelay(1); |
b0b3f578 | 529 | writel(addr, scu->i2c_base + IPC_I2C_CNTRL_ADDR); |
9a58a333 | 530 | } else { |
20903169 | 531 | dev_err(scu->dev, |
9a58a333 SD |
532 | "intel_scu_ipc: I2C INVALID_CMD = 0x%x\n", cmd); |
533 | ||
534 | mutex_unlock(&ipclock); | |
5369c02d | 535 | return -EIO; |
9a58a333 SD |
536 | } |
537 | mutex_unlock(&ipclock); | |
538 | return 0; | |
539 | } | |
540 | EXPORT_SYMBOL(intel_scu_ipc_i2c_cntrl); | |
541 | ||
9a58a333 SD |
542 | /* |
543 | * Interrupt handler gets called when ioc bit of IPC_COMMAND_REG set to 1 | |
544 | * When ioc bit is set to 1, caller api must wait for interrupt handler called | |
545 | * which in turn unlocks the caller api. Currently this is not used | |
546 | * | |
547 | * This is edge triggered so we need take no action to clear anything | |
548 | */ | |
549 | static irqreturn_t ioc(int irq, void *dev_id) | |
550 | { | |
b0b3f578 AS |
551 | struct intel_scu_ipc_dev *scu = dev_id; |
552 | ||
553 | if (scu->irq_mode) | |
554 | complete(&scu->cmd_complete); | |
ed12f295 | 555 | |
9a58a333 SD |
556 | return IRQ_HANDLED; |
557 | } | |
558 | ||
559 | /** | |
560 | * ipc_probe - probe an Intel SCU IPC | |
20903169 | 561 | * @pdev: the PCI device matching |
9a58a333 SD |
562 | * @id: entry in the match table |
563 | * | |
564 | * Enable and install an intel SCU IPC. This appears in the PCI space | |
565 | * but uses some hard coded addresses as well. | |
566 | */ | |
20903169 | 567 | static int ipc_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
9a58a333 | 568 | { |
51c58f2b | 569 | int platform; /* Platform type */ |
694e523c | 570 | int err; |
b0b3f578 | 571 | struct intel_scu_ipc_dev *scu = &ipcdev; |
e97a1c98 | 572 | struct intel_scu_ipc_pdata_t *pdata; |
9a58a333 | 573 | |
51c58f2b AS |
574 | platform = intel_mid_identify_cpu(); |
575 | if (platform == 0) | |
576 | return -ENODEV; | |
577 | ||
20903169 | 578 | if (scu->dev) /* We support only one SCU */ |
9a58a333 SD |
579 | return -EBUSY; |
580 | ||
694e523c | 581 | pdata = (struct intel_scu_ipc_pdata_t *)id->driver_data; |
e97a1c98 | 582 | |
20903169 | 583 | scu->dev = &pdev->dev; |
b0b3f578 | 584 | scu->irq_mode = pdata->irq_mode; |
9a58a333 | 585 | |
20903169 | 586 | err = pcim_enable_device(pdev); |
9a58a333 SD |
587 | if (err) |
588 | return err; | |
589 | ||
20903169 | 590 | err = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev)); |
9a58a333 SD |
591 | if (err) |
592 | return err; | |
593 | ||
b0b3f578 | 594 | init_completion(&scu->cmd_complete); |
ed12f295 | 595 | |
20903169 | 596 | err = devm_request_irq(&pdev->dev, pdev->irq, ioc, 0, "intel_scu_ipc", |
b0b3f578 | 597 | scu); |
f63fbcee AS |
598 | if (err) |
599 | return err; | |
9a58a333 | 600 | |
20903169 | 601 | scu->ipc_base = pcim_iomap_table(pdev)[0]; |
9a58a333 | 602 | |
b0b3f578 AS |
603 | scu->i2c_base = ioremap_nocache(pdata->i2c_base, pdata->i2c_len); |
604 | if (!scu->i2c_base) | |
9a58a333 | 605 | return -ENOMEM; |
1da4b1c6 FT |
606 | |
607 | intel_scu_devices_create(); | |
608 | ||
20903169 | 609 | pci_set_drvdata(pdev, scu); |
9a58a333 SD |
610 | return 0; |
611 | } | |
612 | ||
9baa3c34 | 613 | static const struct pci_device_id pci_ids[] = { |
694e523c | 614 | { |
b4b0b4a9 | 615 | PCI_VDEVICE(INTEL, PCI_DEVICE_ID_LINCROFT), |
694e523c DC |
616 | (kernel_ulong_t)&intel_scu_ipc_lincroft_pdata, |
617 | }, { | |
b4b0b4a9 | 618 | PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PENWELL), |
694e523c DC |
619 | (kernel_ulong_t)&intel_scu_ipc_penwell_pdata, |
620 | }, { | |
b4b0b4a9 | 621 | PCI_VDEVICE(INTEL, PCI_DEVICE_ID_CLOVERVIEW), |
694e523c DC |
622 | (kernel_ulong_t)&intel_scu_ipc_penwell_pdata, |
623 | }, { | |
b4b0b4a9 | 624 | PCI_VDEVICE(INTEL, PCI_DEVICE_ID_TANGIER), |
694e523c DC |
625 | (kernel_ulong_t)&intel_scu_ipc_tangier_pdata, |
626 | }, { | |
627 | 0, | |
628 | } | |
9a58a333 | 629 | }; |
9a58a333 SD |
630 | |
631 | static struct pci_driver ipc_driver = { | |
f52ab44f PG |
632 | .driver = { |
633 | .suppress_bind_attrs = true, | |
634 | }, | |
9a58a333 SD |
635 | .name = "intel_scu_ipc", |
636 | .id_table = pci_ids, | |
637 | .probe = ipc_probe, | |
9a58a333 | 638 | }; |
f52ab44f | 639 | builtin_pci_driver(ipc_driver); |