5  * SMBus host driver for PA Semi PWRficient
63 static inline void reg_write(struct pasemi_smbus *smbus, int reg, int val)  in reg_write()  argument
65 	dev_dbg(smbus->dev, "smbus write reg %x val %08x\n", reg, val);  in reg_write()
66 	iowrite32(val, smbus->ioaddr + reg);  in reg_write()
69 static inline int reg_read(struct pasemi_smbus *smbus, int reg)  in reg_read()  argument
72 	ret = ioread32(smbus->ioaddr + reg);  in reg_read()
73 	dev_dbg(smbus->dev, "smbus read reg %x val %08x\n", reg, ret);  in reg_read()
77 #define TXFIFO_WR(smbus, reg)	reg_write((smbus), REG_MTXFIFO, (reg))  argument
78 #define RXFIFO_RD(smbus)	reg_read((smbus), REG_MRXFIFO)  argument
80 static void pasemi_reset(struct pasemi_smbus *smbus)  in pasemi_reset()  argument
82 	u32 val = (CTL_MTR | CTL_MRR | CTL_UJM | (smbus->clk_div & CTL_CLK_M));  in pasemi_reset()
84 	if (smbus->hw_rev >= 6)  in pasemi_reset()
87 	reg_write(smbus, REG_CTL, val);  in pasemi_reset()
88 	reinit_completion(&smbus->irq_completion);  in pasemi_reset()
91 static int pasemi_smb_clear(struct pasemi_smbus *smbus)  in pasemi_smb_clear()  argument
97 	ret = readx_poll_timeout(ioread32, smbus->ioaddr + REG_SMSTA,  in pasemi_smb_clear()
103 		dev_err(smbus->dev, "Bus is still stuck (status 0x%08x xfstatus 0x%08x)\n",  in pasemi_smb_clear()
104 			 status, reg_read(smbus, REG_XFSTA));  in pasemi_smb_clear()
111 		dev_warn(smbus->dev, "Issuing reset due to status 0x%08x (xfstatus 0x%08x)\n",  in pasemi_smb_clear()
112 			 status, reg_read(smbus, REG_XFSTA));  in pasemi_smb_clear()
113 		pasemi_reset(smbus);  in pasemi_smb_clear()
117 	reg_write(smbus, REG_SMSTA, status);  in pasemi_smb_clear()
122 static int pasemi_smb_waitready(struct pasemi_smbus *smbus)  in pasemi_smb_waitready()  argument
126 	if (smbus->use_irq) {  in pasemi_smb_waitready()
127 		reinit_completion(&smbus->irq_completion);  in pasemi_smb_waitready()
128 		reg_write(smbus, REG_IMASK, SMSTA_XEN | SMSTA_MTN);  in pasemi_smb_waitready()
130 				&smbus->irq_completion,  in pasemi_smb_waitready()
132 		reg_write(smbus, REG_IMASK, 0);  in pasemi_smb_waitready()
133 		status = reg_read(smbus, REG_SMSTA);  in pasemi_smb_waitready()
136 			dev_err(smbus->dev,  in pasemi_smb_waitready()
141 			dev_err(smbus->dev, "Timeout, status 0x%08x\n", status);  in pasemi_smb_waitready()
146 				ioread32, smbus->ioaddr + REG_SMSTA,  in pasemi_smb_waitready()
152 			dev_err(smbus->dev, "Timeout, status 0x%08x\n", status);  in pasemi_smb_waitready()
159 		dev_err(smbus->dev, "Controller timeout, status 0x%08x\n", status);  in pasemi_smb_waitready()
165 		dev_err(smbus->dev, "Peripheral timeout, status 0x%08x\n", status);  in pasemi_smb_waitready()
171 		dev_err(smbus->dev, "Bus stuck, status 0x%08x\n", status);  in pasemi_smb_waitready()
177 		dev_err(smbus->dev, "Arbitration loss, status 0x%08x\n", status);  in pasemi_smb_waitready()
183 		dev_err(smbus->dev, "NACK, status 0x%08x\n", status);  in pasemi_smb_waitready()
188 	reg_write(smbus, REG_SMSTA, SMSTA_XEN);  in pasemi_smb_waitready()
196 	struct pasemi_smbus *smbus = adapter->algo_data;  in pasemi_i2c_xfer_msg()  local
202 	TXFIFO_WR(smbus, MTXFIFO_START | i2c_8bit_addr_from_msg(msg));  in pasemi_i2c_xfer_msg()
205 		TXFIFO_WR(smbus, msg->len | MTXFIFO_READ |  in pasemi_i2c_xfer_msg()
208 		err = pasemi_smb_waitready(smbus);  in pasemi_i2c_xfer_msg()
213 			rd = RXFIFO_RD(smbus);  in pasemi_i2c_xfer_msg()
222 			TXFIFO_WR(smbus, msg->buf[i]);  in pasemi_i2c_xfer_msg()
224 		TXFIFO_WR(smbus, msg->buf[msg->len-1] |  in pasemi_i2c_xfer_msg()
228 			err = pasemi_smb_waitready(smbus);  in pasemi_i2c_xfer_msg()
237 	pasemi_reset(smbus);  in pasemi_i2c_xfer_msg()
244 	struct pasemi_smbus *smbus = adapter->algo_data;  in pasemi_i2c_xfer()  local
247 	ret = pasemi_smb_clear(smbus);  in pasemi_i2c_xfer()
261 	struct pasemi_smbus *smbus = adapter->algo_data;  in pasemi_smb_xfer()  local
270 	err = pasemi_smb_clear(smbus);  in pasemi_smb_xfer()
276 		TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START |  in pasemi_smb_xfer()
280 		TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START);  in pasemi_smb_xfer()
282 			TXFIFO_WR(smbus, 1 | MTXFIFO_STOP | MTXFIFO_READ);  in pasemi_smb_xfer()
284 			TXFIFO_WR(smbus, MTXFIFO_STOP | command);  in pasemi_smb_xfer()
287 		TXFIFO_WR(smbus, addr | MTXFIFO_START);  in pasemi_smb_xfer()
288 		TXFIFO_WR(smbus, command);  in pasemi_smb_xfer()
290 			TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);  in pasemi_smb_xfer()
291 			TXFIFO_WR(smbus, 1 | MTXFIFO_READ | MTXFIFO_STOP);  in pasemi_smb_xfer()
293 			TXFIFO_WR(smbus, MTXFIFO_STOP | data->byte);  in pasemi_smb_xfer()
297 		TXFIFO_WR(smbus, addr | MTXFIFO_START);  in pasemi_smb_xfer()
298 		TXFIFO_WR(smbus, command);  in pasemi_smb_xfer()
300 			TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);  in pasemi_smb_xfer()
301 			TXFIFO_WR(smbus, 2 | MTXFIFO_READ | MTXFIFO_STOP);  in pasemi_smb_xfer()
303 			TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M);  in pasemi_smb_xfer()
304 			TXFIFO_WR(smbus, MTXFIFO_STOP | (data->word >> 8));  in pasemi_smb_xfer()
308 		TXFIFO_WR(smbus, addr | MTXFIFO_START);  in pasemi_smb_xfer()
309 		TXFIFO_WR(smbus, command);  in pasemi_smb_xfer()
311 			TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);  in pasemi_smb_xfer()
312 			TXFIFO_WR(smbus, 1 | MTXFIFO_READ);  in pasemi_smb_xfer()
313 			rd = RXFIFO_RD(smbus);  in pasemi_smb_xfer()
316 			TXFIFO_WR(smbus, len | MTXFIFO_READ |  in pasemi_smb_xfer()
320 			TXFIFO_WR(smbus, len);  in pasemi_smb_xfer()
322 				TXFIFO_WR(smbus, data->block[i]);  in pasemi_smb_xfer()
323 			TXFIFO_WR(smbus, data->block[len] | MTXFIFO_STOP);  in pasemi_smb_xfer()
328 		TXFIFO_WR(smbus, addr | MTXFIFO_START);  in pasemi_smb_xfer()
329 		TXFIFO_WR(smbus, command);  in pasemi_smb_xfer()
330 		TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M);  in pasemi_smb_xfer()
331 		TXFIFO_WR(smbus, (data->word >> 8) & MTXFIFO_DATA_M);  in pasemi_smb_xfer()
332 		TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);  in pasemi_smb_xfer()
333 		TXFIFO_WR(smbus, 2 | MTXFIFO_STOP | MTXFIFO_READ);  in pasemi_smb_xfer()
338 		TXFIFO_WR(smbus, addr | MTXFIFO_START);  in pasemi_smb_xfer()
339 		TXFIFO_WR(smbus, command);  in pasemi_smb_xfer()
340 		TXFIFO_WR(smbus, len);  in pasemi_smb_xfer()
342 			TXFIFO_WR(smbus, data->block[i]);  in pasemi_smb_xfer()
343 		TXFIFO_WR(smbus, addr | I2C_SMBUS_READ);  in pasemi_smb_xfer()
344 		TXFIFO_WR(smbus, MTXFIFO_READ | 1);  in pasemi_smb_xfer()
345 		rd = RXFIFO_RD(smbus);  in pasemi_smb_xfer()
348 		TXFIFO_WR(smbus, len | MTXFIFO_READ | MTXFIFO_STOP);  in pasemi_smb_xfer()
356 	err = pasemi_smb_waitready(smbus);  in pasemi_smb_xfer()
366 		rd = RXFIFO_RD(smbus);  in pasemi_smb_xfer()
375 		rd = RXFIFO_RD(smbus);  in pasemi_smb_xfer()
381 		rd = RXFIFO_RD(smbus);  in pasemi_smb_xfer()
392 			rd = RXFIFO_RD(smbus);  in pasemi_smb_xfer()
405 	pasemi_reset(smbus);  in pasemi_smb_xfer()
423 int pasemi_i2c_common_probe(struct pasemi_smbus *smbus)  in pasemi_i2c_common_probe()  argument
427 	smbus->adapter.owner = THIS_MODULE;  in pasemi_i2c_common_probe()
428 	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),  in pasemi_i2c_common_probe()
429 		 "PA Semi SMBus adapter (%s)", dev_name(smbus->dev));  in pasemi_i2c_common_probe()
430 	smbus->adapter.algo = &smbus_algorithm;  in pasemi_i2c_common_probe()
431 	smbus->adapter.algo_data = smbus;  in pasemi_i2c_common_probe()
434 	smbus->adapter.dev.parent = smbus->dev;  in pasemi_i2c_common_probe()
435 	smbus->use_irq = 0;  in pasemi_i2c_common_probe()
436 	init_completion(&smbus->irq_completion);  in pasemi_i2c_common_probe()
438 	if (smbus->hw_rev != PASEMI_HW_REV_PCI)  in pasemi_i2c_common_probe()
439 		smbus->hw_rev = reg_read(smbus, REG_REV);  in pasemi_i2c_common_probe()
441 	reg_write(smbus, REG_IMASK, 0);  in pasemi_i2c_common_probe()
443 	pasemi_reset(smbus);  in pasemi_i2c_common_probe()
445 	error = devm_i2c_add_adapter(smbus->dev, &smbus->adapter);  in pasemi_i2c_common_probe()
455 	struct pasemi_smbus *smbus = dev_id;  in pasemi_irq_handler()  local
457 	reg_write(smbus, REG_IMASK, 0);  in pasemi_irq_handler()
458 	complete(&smbus->irq_completion);  in pasemi_irq_handler()
465 MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");