Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright (C) 2002 Intersil Americas Inc. |
| 4 | * Copyright (C) 2003-2004 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>_ |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <linux/version.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/delay.h> |
| 25 | |
| 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/io.h> |
| 28 | |
| 29 | #include "prismcompat.h" |
| 30 | #include "isl_38xx.h" |
| 31 | #include "islpci_dev.h" |
| 32 | #include "islpci_mgt.h" |
| 33 | |
| 34 | /****************************************************************************** |
| 35 | Device Interface & Control functions |
| 36 | ******************************************************************************/ |
| 37 | |
| 38 | /** |
| 39 | * isl38xx_disable_interrupts - disable all interrupts |
| 40 | * @device: pci memory base address |
| 41 | * |
| 42 | * Instructs the device to disable all interrupt reporting by asserting |
| 43 | * the IRQ line. New events may still show up in the interrupt identification |
| 44 | * register located at offset %ISL38XX_INT_IDENT_REG. |
| 45 | */ |
| 46 | void |
| 47 | isl38xx_disable_interrupts(void __iomem *device) |
| 48 | { |
| 49 | isl38xx_w32_flush(device, 0x00000000, ISL38XX_INT_EN_REG); |
| 50 | udelay(ISL38XX_WRITEIO_DELAY); |
| 51 | } |
| 52 | |
| 53 | void |
| 54 | isl38xx_handle_sleep_request(isl38xx_control_block *control_block, |
| 55 | int *powerstate, void __iomem *device_base) |
| 56 | { |
| 57 | /* device requests to go into sleep mode |
| 58 | * check whether the transmit queues for data and management are empty */ |
| 59 | if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ)) |
| 60 | /* data tx queue not empty */ |
| 61 | return; |
| 62 | |
| 63 | if (isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ)) |
| 64 | /* management tx queue not empty */ |
| 65 | return; |
| 66 | |
| 67 | /* check also whether received frames are pending */ |
| 68 | if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_DATA_LQ)) |
| 69 | /* data rx queue not empty */ |
| 70 | return; |
| 71 | |
| 72 | if (isl38xx_in_queue(control_block, ISL38XX_CB_RX_MGMTQ)) |
| 73 | /* management rx queue not empty */ |
| 74 | return; |
| 75 | |
| 76 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 77 | DEBUG(SHOW_TRACING, "Device going to sleep mode\n"); |
| 78 | #endif |
| 79 | |
| 80 | /* all queues are empty, allow the device to go into sleep mode */ |
| 81 | *powerstate = ISL38XX_PSM_POWERSAVE_STATE; |
| 82 | |
| 83 | /* assert the Sleep interrupt in the Device Interrupt Register */ |
| 84 | isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_SLEEP, |
| 85 | ISL38XX_DEV_INT_REG); |
| 86 | udelay(ISL38XX_WRITEIO_DELAY); |
| 87 | } |
| 88 | |
| 89 | void |
| 90 | isl38xx_handle_wakeup(isl38xx_control_block *control_block, |
| 91 | int *powerstate, void __iomem *device_base) |
| 92 | { |
| 93 | /* device is in active state, update the powerstate flag */ |
| 94 | *powerstate = ISL38XX_PSM_ACTIVE_STATE; |
| 95 | |
| 96 | /* now check whether there are frames pending for the card */ |
| 97 | if (!isl38xx_in_queue(control_block, ISL38XX_CB_TX_DATA_LQ) |
| 98 | && !isl38xx_in_queue(control_block, ISL38XX_CB_TX_MGMTQ)) |
| 99 | return; |
| 100 | |
| 101 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 102 | DEBUG(SHOW_ANYTHING, "Wake up handler trigger the device\n"); |
| 103 | #endif |
| 104 | |
| 105 | /* either data or management transmit queue has a frame pending |
| 106 | * trigger the device by setting the Update bit in the Device Int reg */ |
| 107 | isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE, |
| 108 | ISL38XX_DEV_INT_REG); |
| 109 | udelay(ISL38XX_WRITEIO_DELAY); |
| 110 | } |
| 111 | |
| 112 | void |
| 113 | isl38xx_trigger_device(int asleep, void __iomem *device_base) |
| 114 | { |
| 115 | struct timeval current_time; |
| 116 | u32 reg, counter = 0; |
| 117 | |
| 118 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 119 | DEBUG(SHOW_FUNCTION_CALLS, "isl38xx trigger device\n"); |
| 120 | #endif |
| 121 | |
| 122 | /* check whether the device is in power save mode */ |
| 123 | if (asleep) { |
| 124 | /* device is in powersave, trigger the device for wakeup */ |
| 125 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 126 | do_gettimeofday(¤t_time); |
| 127 | DEBUG(SHOW_TRACING, "%08li.%08li Device wakeup triggered\n", |
| 128 | current_time.tv_sec, (long)current_time.tv_usec); |
| 129 | #endif |
| 130 | |
| 131 | DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n", |
| 132 | current_time.tv_sec, (long)current_time.tv_usec, |
| 133 | readl(device_base + ISL38XX_CTRL_STAT_REG)); |
| 134 | udelay(ISL38XX_WRITEIO_DELAY); |
| 135 | |
| 136 | reg = readl(device_base + ISL38XX_INT_IDENT_REG); |
| 137 | if (reg == 0xabadface) { |
| 138 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 139 | do_gettimeofday(¤t_time); |
| 140 | DEBUG(SHOW_TRACING, |
| 141 | "%08li.%08li Device register abadface\n", |
| 142 | current_time.tv_sec, (long)current_time.tv_usec); |
| 143 | #endif |
| 144 | /* read the Device Status Register until Sleepmode bit is set */ |
| 145 | while (reg = readl(device_base + ISL38XX_CTRL_STAT_REG), |
| 146 | (reg & ISL38XX_CTRL_STAT_SLEEPMODE) == 0) { |
| 147 | udelay(ISL38XX_WRITEIO_DELAY); |
| 148 | counter++; |
| 149 | } |
| 150 | |
| 151 | DEBUG(SHOW_TRACING, |
| 152 | "%08li.%08li Device register read %08x\n", |
| 153 | current_time.tv_sec, (long)current_time.tv_usec, |
| 154 | readl(device_base + ISL38XX_CTRL_STAT_REG)); |
| 155 | udelay(ISL38XX_WRITEIO_DELAY); |
| 156 | |
| 157 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 158 | do_gettimeofday(¤t_time); |
| 159 | DEBUG(SHOW_TRACING, |
| 160 | "%08li.%08li Device asleep counter %i\n", |
| 161 | current_time.tv_sec, (long)current_time.tv_usec, |
| 162 | counter); |
| 163 | #endif |
| 164 | } |
| 165 | /* assert the Wakeup interrupt in the Device Interrupt Register */ |
| 166 | isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_WAKEUP, |
| 167 | ISL38XX_DEV_INT_REG); |
| 168 | udelay(ISL38XX_WRITEIO_DELAY); |
| 169 | |
| 170 | /* perform another read on the Device Status Register */ |
| 171 | reg = readl(device_base + ISL38XX_CTRL_STAT_REG); |
| 172 | udelay(ISL38XX_WRITEIO_DELAY); |
| 173 | |
| 174 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 175 | do_gettimeofday(¤t_time); |
| 176 | DEBUG(SHOW_TRACING, "%08li.%08li Device register read %08x\n", |
| 177 | current_time.tv_sec, (long)current_time.tv_usec, reg); |
| 178 | #endif |
| 179 | } else { |
| 180 | /* device is (still) awake */ |
| 181 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 182 | DEBUG(SHOW_TRACING, "Device is in active state\n"); |
| 183 | #endif |
| 184 | /* trigger the device by setting the Update bit in the Device Int reg */ |
| 185 | |
| 186 | isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_UPDATE, |
| 187 | ISL38XX_DEV_INT_REG); |
| 188 | udelay(ISL38XX_WRITEIO_DELAY); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | void |
| 193 | isl38xx_interface_reset(void __iomem *device_base, dma_addr_t host_address) |
| 194 | { |
| 195 | #if VERBOSE > SHOW_ERROR_MESSAGES |
| 196 | DEBUG(SHOW_FUNCTION_CALLS, "isl38xx_interface_reset\n"); |
| 197 | #endif |
| 198 | |
| 199 | /* load the address of the control block in the device */ |
| 200 | isl38xx_w32_flush(device_base, host_address, ISL38XX_CTRL_BLK_BASE_REG); |
| 201 | udelay(ISL38XX_WRITEIO_DELAY); |
| 202 | |
| 203 | /* set the reset bit in the Device Interrupt Register */ |
| 204 | isl38xx_w32_flush(device_base, ISL38XX_DEV_INT_RESET, ISL38XX_DEV_INT_REG); |
| 205 | udelay(ISL38XX_WRITEIO_DELAY); |
| 206 | |
| 207 | /* enable the interrupt for detecting initialization */ |
| 208 | |
| 209 | /* Note: Do not enable other interrupts here. We want the |
| 210 | * device to have come up first 100% before allowing any other |
| 211 | * interrupts. */ |
| 212 | isl38xx_w32_flush(device_base, ISL38XX_INT_IDENT_INIT, ISL38XX_INT_EN_REG); |
| 213 | udelay(ISL38XX_WRITEIO_DELAY); /* allow complete full reset */ |
| 214 | } |
| 215 | |
| 216 | void |
| 217 | isl38xx_enable_common_interrupts(void __iomem *device_base) { |
| 218 | u32 reg; |
| 219 | reg = ( ISL38XX_INT_IDENT_UPDATE | |
| 220 | ISL38XX_INT_IDENT_SLEEP | ISL38XX_INT_IDENT_WAKEUP); |
| 221 | isl38xx_w32_flush(device_base, reg, ISL38XX_INT_EN_REG); |
| 222 | udelay(ISL38XX_WRITEIO_DELAY); |
| 223 | } |
| 224 | |
| 225 | int |
| 226 | isl38xx_in_queue(isl38xx_control_block *cb, int queue) |
| 227 | { |
| 228 | const s32 delta = (le32_to_cpu(cb->driver_curr_frag[queue]) - |
| 229 | le32_to_cpu(cb->device_curr_frag[queue])); |
| 230 | |
| 231 | /* determine the amount of fragments in the queue depending on the type |
| 232 | * of the queue, either transmit or receive */ |
| 233 | |
| 234 | BUG_ON(delta < 0); /* driver ptr must be ahead of device ptr */ |
| 235 | |
| 236 | switch (queue) { |
| 237 | /* send queues */ |
| 238 | case ISL38XX_CB_TX_MGMTQ: |
| 239 | BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE); |
| 240 | case ISL38XX_CB_TX_DATA_LQ: |
| 241 | case ISL38XX_CB_TX_DATA_HQ: |
| 242 | BUG_ON(delta > ISL38XX_CB_TX_QSIZE); |
| 243 | return delta; |
| 244 | break; |
| 245 | |
| 246 | /* receive queues */ |
| 247 | case ISL38XX_CB_RX_MGMTQ: |
| 248 | BUG_ON(delta > ISL38XX_CB_MGMT_QSIZE); |
| 249 | return ISL38XX_CB_MGMT_QSIZE - delta; |
| 250 | break; |
| 251 | |
| 252 | case ISL38XX_CB_RX_DATA_LQ: |
| 253 | case ISL38XX_CB_RX_DATA_HQ: |
| 254 | BUG_ON(delta > ISL38XX_CB_RX_QSIZE); |
| 255 | return ISL38XX_CB_RX_QSIZE - delta; |
| 256 | break; |
| 257 | } |
| 258 | BUG(); |
| 259 | return 0; |
| 260 | } |