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>
20 #include "falcon_hwdefs.h"
23 /**************************************************************************
25 * I2C IO Expander device
27 **************************************************************************/
32 #define P0_INVERT 0x04
33 #define P0_CONFIG 0x06
35 #define P0_EN_1V0X_LBN 0
36 #define P0_EN_1V0X_WIDTH 1
37 #define P0_EN_1V2_LBN 1
38 #define P0_EN_1V2_WIDTH 1
39 #define P0_EN_2V5_LBN 2
40 #define P0_EN_2V5_WIDTH 1
41 #define P0_EN_3V3X_LBN 3
42 #define P0_EN_3V3X_WIDTH 1
43 #define P0_EN_5V_LBN 4
44 #define P0_EN_5V_WIDTH 1
45 #define P0_SHORTEN_JTAG_LBN 5
46 #define P0_SHORTEN_JTAG_WIDTH 1
47 #define P0_X_TRST_LBN 6
48 #define P0_X_TRST_WIDTH 1
49 #define P0_DSP_RESET_LBN 7
50 #define P0_DSP_RESET_WIDTH 1
54 #define P1_INVERT 0x05
55 #define P1_CONFIG 0x07
57 #define P1_AFE_PWD_LBN 0
58 #define P1_AFE_PWD_WIDTH 1
59 #define P1_DSP_PWD25_LBN 1
60 #define P1_DSP_PWD25_WIDTH 1
61 #define P1_RESERVED_LBN 2
62 #define P1_RESERVED_WIDTH 2
63 #define P1_SPARE_LBN 4
64 #define P1_SPARE_WIDTH 4
67 /**************************************************************************
71 **************************************************************************/
98 #define MAX6647_BUSY (1 << 7) /* ADC is converting */
99 #define MAX6647_LHIGH (1 << 6) /* Local high temp. alarm */
100 #define MAX6647_LLOW (1 << 5) /* Local low temp. alarm */
101 #define MAX6647_RHIGH (1 << 4) /* Remote high temp. alarm */
102 #define MAX6647_RLOW (1 << 3) /* Remote low temp. alarm */
103 #define MAX6647_FAULT (1 << 2) /* DXN/DXP short/open circuit */
104 #define MAX6647_EOT (1 << 1) /* Remote junction overtemp. */
105 #define MAX6647_IOT (1 << 0) /* Local junction overtemp. */
107 static const u8 xgphy_max_temperature
= 90;
109 static void sfe4001_poweroff(struct efx_nic
*efx
)
111 struct i2c_client
*ioexp_client
= efx
->board_info
.ioexp_client
;
112 struct i2c_client
*hwmon_client
= efx
->board_info
.hwmon_client
;
114 /* Turn off all power rails and disable outputs */
115 i2c_smbus_write_byte_data(ioexp_client
, P0_OUT
, 0xff);
116 i2c_smbus_write_byte_data(ioexp_client
, P1_CONFIG
, 0xff);
117 i2c_smbus_write_byte_data(ioexp_client
, P0_CONFIG
, 0xff);
119 /* Clear any over-temperature alert */
120 i2c_smbus_read_byte_data(hwmon_client
, RSL
);
123 static void sfe4001_fini(struct efx_nic
*efx
)
125 EFX_INFO(efx
, "%s\n", __func__
);
127 sfe4001_poweroff(efx
);
128 i2c_unregister_device(efx
->board_info
.ioexp_client
);
129 i2c_unregister_device(efx
->board_info
.hwmon_client
);
132 /* The P0_EN_3V3X line on SFE4001 boards (from A2 onward) is connected
133 * to the FLASH_CFG_1 input on the DSP. We must keep it high at power-
134 * up to allow writing the flash (done through MDIO from userland).
136 unsigned int sfe4001_phy_flash_cfg
;
137 module_param_named(phy_flash_cfg
, sfe4001_phy_flash_cfg
, uint
, 0444);
138 MODULE_PARM_DESC(phy_flash_cfg
,
139 "Force PHY to enter flash configuration mode");
141 /* This board uses an I2C expander to provider power to the PHY, which needs to
142 * be turned on before the PHY can be used.
143 * Context: Process context, rtnl lock held
145 int sfe4001_init(struct efx_nic
*efx
)
147 struct i2c_client
*hwmon_client
, *ioexp_client
;
153 hwmon_client
= i2c_new_dummy(&efx
->i2c_adap
, MAX6647
);
156 efx
->board_info
.hwmon_client
= hwmon_client
;
158 ioexp_client
= i2c_new_dummy(&efx
->i2c_adap
, PCA9539
);
163 efx
->board_info
.ioexp_client
= ioexp_client
;
165 /* 10Xpress has fixed-function LED pins, so there is no board-specific
167 efx
->board_info
.blink
= tenxpress_phy_blink
;
169 /* Ensure that XGXS and XAUI SerDes are held in reset */
170 EFX_POPULATE_DWORD_7(reg
, XX_PWRDNA_EN
, 1,
177 falcon_xmac_writel(efx
, ®
, XX_PWR_RST_REG_MAC
);
180 efx
->board_info
.fini
= sfe4001_fini
;
182 /* Set DSP over-temperature alert threshold */
183 EFX_INFO(efx
, "DSP cut-out at %dC\n", xgphy_max_temperature
);
184 rc
= i2c_smbus_write_byte_data(hwmon_client
, WLHO
,
185 xgphy_max_temperature
);
189 /* Read it back and verify */
190 rc
= i2c_smbus_read_byte_data(hwmon_client
, RLHN
);
193 if (rc
!= xgphy_max_temperature
) {
198 /* Clear any previous over-temperature alert */
199 rc
= i2c_smbus_read_byte_data(hwmon_client
, RSL
);
203 /* Enable port 0 and port 1 outputs on IO expander */
204 rc
= i2c_smbus_write_byte_data(ioexp_client
, P0_CONFIG
, 0x00);
207 rc
= i2c_smbus_write_byte_data(ioexp_client
, P1_CONFIG
,
208 0xff & ~(1 << P1_SPARE_LBN
));
212 /* If PHY power is on, turn it all off and wait 1 second to
213 * ensure a full reset.
215 rc
= i2c_smbus_read_byte_data(ioexp_client
, P0_OUT
);
218 out
= 0xff & ~((0 << P0_EN_1V2_LBN
) | (0 << P0_EN_2V5_LBN
) |
219 (0 << P0_EN_3V3X_LBN
) | (0 << P0_EN_5V_LBN
) |
220 (0 << P0_EN_1V0X_LBN
));
222 EFX_INFO(efx
, "power-cycling PHY\n");
223 rc
= i2c_smbus_write_byte_data(ioexp_client
, P0_OUT
, out
);
226 schedule_timeout_uninterruptible(HZ
);
229 for (i
= 0; i
< 20; ++i
) {
230 /* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
231 out
= 0xff & ~((1 << P0_EN_1V2_LBN
) | (1 << P0_EN_2V5_LBN
) |
232 (1 << P0_EN_3V3X_LBN
) | (1 << P0_EN_5V_LBN
) |
233 (1 << P0_X_TRST_LBN
));
234 if (sfe4001_phy_flash_cfg
)
235 out
|= 1 << P0_EN_3V3X_LBN
;
237 rc
= i2c_smbus_write_byte_data(ioexp_client
, P0_OUT
, out
);
242 /* Turn on 1V power rail */
243 out
&= ~(1 << P0_EN_1V0X_LBN
);
244 rc
= i2c_smbus_write_byte_data(ioexp_client
, P0_OUT
, out
);
248 EFX_INFO(efx
, "waiting for DSP boot (attempt %d)...\n", i
);
250 /* In flash config mode, DSP does not turn on AFE, so
251 * just wait 1 second.
253 if (sfe4001_phy_flash_cfg
) {
254 schedule_timeout_uninterruptible(HZ
);
258 for (j
= 0; j
< 10; ++j
) {
261 /* Check DSP has asserted AFE power line */
262 rc
= i2c_smbus_read_byte_data(ioexp_client
, P1_IN
);
265 if (rc
& (1 << P1_AFE_PWD_LBN
))
270 EFX_INFO(efx
, "timed out waiting for DSP boot\n");
275 EFX_INFO(efx
, "PHY is powered on\n");
279 sfe4001_poweroff(efx
);
281 i2c_unregister_device(ioexp_client
);
283 i2c_unregister_device(hwmon_client
);