1 /****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2007 Solarflare Communications Inc.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
10 /*****************************************************************************
11 * Support for the SFE4001 NIC: driver code for the PCA9539 I/O expander that
12 * controls the PHY power rails, and for the MAX6647 temp. sensor used to check
15 #include <linux/delay.h>
16 #include "net_driver.h"
21 #include "falcon_hwdefs.h"
22 #include "falcon_io.h"
25 /**************************************************************************
27 * I2C IO Expander device
29 **************************************************************************/
34 #define P0_INVERT 0x04
35 #define P0_CONFIG 0x06
37 #define P0_EN_1V0X_LBN 0
38 #define P0_EN_1V0X_WIDTH 1
39 #define P0_EN_1V2_LBN 1
40 #define P0_EN_1V2_WIDTH 1
41 #define P0_EN_2V5_LBN 2
42 #define P0_EN_2V5_WIDTH 1
43 #define P0_EN_3V3X_LBN 3
44 #define P0_EN_3V3X_WIDTH 1
45 #define P0_EN_5V_LBN 4
46 #define P0_EN_5V_WIDTH 1
47 #define P0_SHORTEN_JTAG_LBN 5
48 #define P0_SHORTEN_JTAG_WIDTH 1
49 #define P0_X_TRST_LBN 6
50 #define P0_X_TRST_WIDTH 1
51 #define P0_DSP_RESET_LBN 7
52 #define P0_DSP_RESET_WIDTH 1
56 #define P1_INVERT 0x05
57 #define P1_CONFIG 0x07
59 #define P1_AFE_PWD_LBN 0
60 #define P1_AFE_PWD_WIDTH 1
61 #define P1_DSP_PWD25_LBN 1
62 #define P1_DSP_PWD25_WIDTH 1
63 #define P1_RESERVED_LBN 2
64 #define P1_RESERVED_WIDTH 2
65 #define P1_SPARE_LBN 4
66 #define P1_SPARE_WIDTH 4
69 /**************************************************************************
73 **************************************************************************/
100 #define MAX6647_BUSY (1 << 7) /* ADC is converting */
101 #define MAX6647_LHIGH (1 << 6) /* Local high temp. alarm */
102 #define MAX6647_LLOW (1 << 5) /* Local low temp. alarm */
103 #define MAX6647_RHIGH (1 << 4) /* Remote high temp. alarm */
104 #define MAX6647_RLOW (1 << 3) /* Remote low temp. alarm */
105 #define MAX6647_FAULT (1 << 2) /* DXN/DXP short/open circuit */
106 #define MAX6647_EOT (1 << 1) /* Remote junction overtemp. */
107 #define MAX6647_IOT (1 << 0) /* Local junction overtemp. */
109 static const u8 xgphy_max_temperature = 90;
111 static void sfe4001_poweroff(struct efx_nic *efx)
113 struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
114 struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
116 /* Turn off all power rails and disable outputs */
117 i2c_smbus_write_byte_data(ioexp_client, P0_OUT, 0xff);
118 i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG, 0xff);
119 i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
121 /* Clear any over-temperature alert */
122 i2c_smbus_read_byte_data(hwmon_client, RSL);
125 static int sfe4001_poweron(struct efx_nic *efx)
127 struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
128 struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
133 /* Clear any previous over-temperature alert */
134 rc = i2c_smbus_read_byte_data(hwmon_client, RSL);
138 /* Enable port 0 and port 1 outputs on IO expander */
139 rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
142 rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
143 0xff & ~(1 << P1_SPARE_LBN));
147 /* If PHY power is on, turn it all off and wait 1 second to
148 * ensure a full reset.
150 rc = i2c_smbus_read_byte_data(ioexp_client, P0_OUT);
153 out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
154 (0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
155 (0 << P0_EN_1V0X_LBN));
157 EFX_INFO(efx, "power-cycling PHY\n");
158 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
161 schedule_timeout_uninterruptible(HZ);
164 for (i = 0; i < 20; ++i) {
165 /* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
166 out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
167 (1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
168 (1 << P0_X_TRST_LBN));
169 if (efx->phy_mode & PHY_MODE_SPECIAL)
170 out |= 1 << P0_EN_3V3X_LBN;
172 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
177 /* Turn on 1V power rail */
178 out &= ~(1 << P0_EN_1V0X_LBN);
179 rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
183 EFX_INFO(efx, "waiting for DSP boot (attempt %d)...\n", i);
185 /* In flash config mode, DSP does not turn on AFE, so
186 * just wait 1 second.
188 if (efx->phy_mode & PHY_MODE_SPECIAL) {
189 schedule_timeout_uninterruptible(HZ);
193 for (j = 0; j < 10; ++j) {
196 /* Check DSP has asserted AFE power line */
197 rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
200 if (rc & (1 << P1_AFE_PWD_LBN))
205 EFX_INFO(efx, "timed out waiting for DSP boot\n");
208 sfe4001_poweroff(efx);
212 /* On SFE4001 rev A2 and later, we can control the FLASH_CFG_1 pin
213 * using the 3V3X output of the IO-expander. Allow the user to set
214 * this when the device is stopped, and keep it stopped then.
217 static ssize_t show_phy_flash_cfg(struct device *dev,
218 struct device_attribute *attr, char *buf)
220 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
221 return sprintf(buf, "%d\n", !!(efx->phy_mode & PHY_MODE_SPECIAL));
224 static ssize_t set_phy_flash_cfg(struct device *dev,
225 struct device_attribute *attr,
226 const char *buf, size_t count)
228 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
229 enum efx_phy_mode old_mode, new_mode;
233 old_mode = efx->phy_mode;
234 if (count == 0 || *buf == '0')
235 new_mode = old_mode & ~PHY_MODE_SPECIAL;
237 new_mode = PHY_MODE_SPECIAL;
238 if (old_mode == new_mode) {
240 } else if (efx->state != STATE_RUNNING || netif_running(efx->net_dev)) {
243 efx->phy_mode = new_mode;
244 err = sfe4001_poweron(efx);
245 efx_reconfigure_port(efx);
249 return err ? err : count;
252 static DEVICE_ATTR(phy_flash_cfg, 0644, show_phy_flash_cfg, set_phy_flash_cfg);
254 static void sfe4001_fini(struct efx_nic *efx)
256 EFX_INFO(efx, "%s\n", __func__);
258 device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
259 sfe4001_poweroff(efx);
260 i2c_unregister_device(efx->board_info.ioexp_client);
261 i2c_unregister_device(efx->board_info.hwmon_client);
264 /* This board uses an I2C expander to provider power to the PHY, which needs to
265 * be turned on before the PHY can be used.
266 * Context: Process context, rtnl lock held
268 int sfe4001_init(struct efx_nic *efx)
270 struct i2c_client *hwmon_client;
273 hwmon_client = i2c_new_dummy(&efx->i2c_adap, MAX6647);
276 efx->board_info.hwmon_client = hwmon_client;
278 /* Set DSP over-temperature alert threshold */
279 EFX_INFO(efx, "DSP cut-out at %dC\n", xgphy_max_temperature);
280 rc = i2c_smbus_write_byte_data(hwmon_client, WLHO,
281 xgphy_max_temperature);
285 /* Read it back and verify */
286 rc = i2c_smbus_read_byte_data(hwmon_client, RLHN);
289 if (rc != xgphy_max_temperature) {
294 efx->board_info.ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
295 if (!efx->board_info.ioexp_client) {
300 /* 10Xpress has fixed-function LED pins, so there is no board-specific
302 efx->board_info.blink = tenxpress_phy_blink;
304 efx->board_info.fini = sfe4001_fini;
306 rc = sfe4001_poweron(efx);
310 rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
314 EFX_INFO(efx, "PHY is powered on\n");
318 sfe4001_poweroff(efx);
320 i2c_unregister_device(efx->board_info.ioexp_client);
322 i2c_unregister_device(hwmon_client);