drivers/bcma/driver_pci.c

   1 /*
   2  * Broadcom specific AMBA
   3  * PCI Core
   4  *
   5  * Copyright 2005, 2011, Broadcom Corporation
   6  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
   7  * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
   8  *
   9  * Licensed under the GNU/GPL. See COPYING for details.
  10  */
  11
  12 #include "bcma_private.h"
  13 #include <linux/export.h>
  14 #include <linux/bcma/bcma.h>
  15
  16 /**************************************************
  17  * R/W ops.
  18  **************************************************/
  19
  20 u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address)
  21 {
  22         pcicore_write32(pc, BCMA_CORE_PCI_PCIEIND_ADDR, address);
  23         pcicore_read32(pc, BCMA_CORE_PCI_PCIEIND_ADDR);
  24         return pcicore_read32(pc, BCMA_CORE_PCI_PCIEIND_DATA);
  25 }
  26
  27 static void bcma_pcie_write(struct bcma_drv_pci *pc, u32 address, u32 data)
  28 {
  29         pcicore_write32(pc, BCMA_CORE_PCI_PCIEIND_ADDR, address);
  30         pcicore_read32(pc, BCMA_CORE_PCI_PCIEIND_ADDR);
  31         pcicore_write32(pc, BCMA_CORE_PCI_PCIEIND_DATA, data);
  32 }
  33
  34 static void bcma_pcie_mdio_set_phy(struct bcma_drv_pci *pc, u8 phy)
  35 {
  36         u32 v;
  37         int i;
  38
  39         v = BCMA_CORE_PCI_MDIODATA_START;
  40         v |= BCMA_CORE_PCI_MDIODATA_WRITE;
  41         v |= (BCMA_CORE_PCI_MDIODATA_DEV_ADDR <<
  42               BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF);
  43         v |= (BCMA_CORE_PCI_MDIODATA_BLK_ADDR <<
  44               BCMA_CORE_PCI_MDIODATA_REGADDR_SHF);
  45         v |= BCMA_CORE_PCI_MDIODATA_TA;
  46         v |= (phy << 4);
  47         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_DATA, v);
  48
  49         udelay(10);
  50         for (i = 0; i < 200; i++) {
  51                 v = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_CONTROL);
  52                 if (v & BCMA_CORE_PCI_MDIOCTL_ACCESS_DONE)
  53                         break;
  54                 usleep_range(1000, 2000);
  55         }
  56 }
  57
  58 static u16 bcma_pcie_mdio_read(struct bcma_drv_pci *pc, u8 device, u8 address)
  59 {
  60         int max_retries = 10;
  61         u16 ret = 0;
  62         u32 v;
  63         int i;
  64
  65         /* enable mdio access to SERDES */
  66         v = BCMA_CORE_PCI_MDIOCTL_PREAM_EN;
  67         v |= BCMA_CORE_PCI_MDIOCTL_DIVISOR_VAL;
  68         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, v);
  69
  70         if (pc->core->id.rev >= 10) {
  71                 max_retries = 200;
  72                 bcma_pcie_mdio_set_phy(pc, device);
  73                 v = (BCMA_CORE_PCI_MDIODATA_DEV_ADDR <<
  74                      BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF);
  75                 v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF);
  76         } else {
  77                 v = (device << BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF_OLD);
  78                 v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF_OLD);
  79         }
  80
  81         v = BCMA_CORE_PCI_MDIODATA_START;
  82         v |= BCMA_CORE_PCI_MDIODATA_READ;
  83         v |= BCMA_CORE_PCI_MDIODATA_TA;
  84
  85         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_DATA, v);
  86         /* Wait for the device to complete the transaction */
  87         udelay(10);
  88         for (i = 0; i < max_retries; i++) {
  89                 v = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_CONTROL);
  90                 if (v & BCMA_CORE_PCI_MDIOCTL_ACCESS_DONE) {
  91                         udelay(10);
  92                         ret = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_DATA);
  93                         break;
  94                 }
  95                 usleep_range(1000, 2000);
  96         }
  97         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, 0);
  98         return ret;
  99 }
 100
 101 static void bcma_pcie_mdio_write(struct bcma_drv_pci *pc, u8 device,
 102                                 u8 address, u16 data)
 103 {
 104         int max_retries = 10;
 105         u32 v;
 106         int i;
 107
 108         /* enable mdio access to SERDES */
 109         v = BCMA_CORE_PCI_MDIOCTL_PREAM_EN;
 110         v |= BCMA_CORE_PCI_MDIOCTL_DIVISOR_VAL;
 111         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, v);
 112
 113         if (pc->core->id.rev >= 10) {
 114                 max_retries = 200;
 115                 bcma_pcie_mdio_set_phy(pc, device);
 116                 v = (BCMA_CORE_PCI_MDIODATA_DEV_ADDR <<
 117                      BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF);
 118                 v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF);
 119         } else {
 120                 v = (device << BCMA_CORE_PCI_MDIODATA_DEVADDR_SHF_OLD);
 121                 v |= (address << BCMA_CORE_PCI_MDIODATA_REGADDR_SHF_OLD);
 122         }
 123
 124         v = BCMA_CORE_PCI_MDIODATA_START;
 125         v |= BCMA_CORE_PCI_MDIODATA_WRITE;
 126         v |= BCMA_CORE_PCI_MDIODATA_TA;
 127         v |= data;
 128         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_DATA, v);
 129         /* Wait for the device to complete the transaction */
 130         udelay(10);
 131         for (i = 0; i < max_retries; i++) {
 132                 v = pcicore_read32(pc, BCMA_CORE_PCI_MDIO_CONTROL);
 133                 if (v & BCMA_CORE_PCI_MDIOCTL_ACCESS_DONE)
 134                         break;
 135                 usleep_range(1000, 2000);
 136         }
 137         pcicore_write32(pc, BCMA_CORE_PCI_MDIO_CONTROL, 0);
 138 }
 139
 140 /**************************************************
 141  * Workarounds.
 142  **************************************************/
 143
 144 static u8 bcma_pcicore_polarity_workaround(struct bcma_drv_pci *pc)
 145 {
 146         u32 tmp;
 147
 148         tmp = bcma_pcie_read(pc, BCMA_CORE_PCI_PLP_STATUSREG);
 149         if (tmp & BCMA_CORE_PCI_PLP_POLARITYINV_STAT)
 150                 return BCMA_CORE_PCI_SERDES_RX_CTRL_FORCE |
 151                        BCMA_CORE_PCI_SERDES_RX_CTRL_POLARITY;
 152         else
 153                 return BCMA_CORE_PCI_SERDES_RX_CTRL_FORCE;
 154 }
 155
 156 static void bcma_pcicore_serdes_workaround(struct bcma_drv_pci *pc)
 157 {
 158         u16 tmp;
 159
 160         bcma_pcie_mdio_write(pc, BCMA_CORE_PCI_MDIODATA_DEV_RX,
 161                              BCMA_CORE_PCI_SERDES_RX_CTRL,
 162                              bcma_pcicore_polarity_workaround(pc));
 163         tmp = bcma_pcie_mdio_read(pc, BCMA_CORE_PCI_MDIODATA_DEV_PLL,
 164                                   BCMA_CORE_PCI_SERDES_PLL_CTRL);
 165         if (tmp & BCMA_CORE_PCI_PLL_CTRL_FREQDET_EN)
 166                 bcma_pcie_mdio_write(pc, BCMA_CORE_PCI_MDIODATA_DEV_PLL,
 167                                      BCMA_CORE_PCI_SERDES_PLL_CTRL,
 168                                      tmp & ~BCMA_CORE_PCI_PLL_CTRL_FREQDET_EN);
 169 }
 170
 171 static void bcma_core_pci_fixcfg(struct bcma_drv_pci *pc)
 172 {
 173         struct bcma_device *core = pc->core;
 174         u16 val16, core_index;
 175         uint regoff;
 176
 177         regoff = BCMA_CORE_PCI_SPROM(BCMA_CORE_PCI_SPROM_PI_OFFSET);
 178         core_index = (u16)core->core_index;
 179
 180         val16 = pcicore_read16(pc, regoff);
 181         if (((val16 & BCMA_CORE_PCI_SPROM_PI_MASK) >> BCMA_CORE_PCI_SPROM_PI_SHIFT)
 182              != core_index) {
 183                 val16 = (core_index << BCMA_CORE_PCI_SPROM_PI_SHIFT) |
 184                         (val16 & ~BCMA_CORE_PCI_SPROM_PI_MASK);
 185                 pcicore_write16(pc, regoff, val16);
 186         }
 187 }
 188
 189 /* Fix MISC config to allow coming out of L2/L3-Ready state w/o PRST */
 190 /* Needs to happen when coming out of 'standby'/'hibernate' */
 191 static void bcma_core_pci_config_fixup(struct bcma_drv_pci *pc)
 192 {
 193         u16 val16;
 194         uint regoff;
 195
 196         regoff = BCMA_CORE_PCI_SPROM(BCMA_CORE_PCI_SPROM_MISC_CONFIG);
 197
 198         val16 = pcicore_read16(pc, regoff);
 199
 200         if (!(val16 & BCMA_CORE_PCI_SPROM_L23READY_EXIT_NOPERST)) {
 201                 val16 |= BCMA_CORE_PCI_SPROM_L23READY_EXIT_NOPERST;
 202                 pcicore_write16(pc, regoff, val16);
 203         }
 204 }
 205
 206 /**************************************************
 207  * Init.
 208  **************************************************/
 209
 210 static void bcma_core_pci_clientmode_init(struct bcma_drv_pci *pc)
 211 {
 212         bcma_core_pci_fixcfg(pc);
 213         bcma_pcicore_serdes_workaround(pc);
 214         bcma_core_pci_config_fixup(pc);
 215 }
 216
 217 void bcma_core_pci_init(struct bcma_drv_pci *pc)
 218 {
 219         if (pc->setup_done)
 220                 return;
 221
 222 #ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
 223         pc->hostmode = bcma_core_pci_is_in_hostmode(pc);
 224         if (pc->hostmode)
 225                 bcma_core_pci_hostmode_init(pc);
 226 #endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */
 227
 228         if (!pc->hostmode)
 229                 bcma_core_pci_clientmode_init(pc);
 230 }
 231
 232 int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc, struct bcma_device *core,
 233                           bool enable)
 234 {
 235         struct pci_dev *pdev;
 236         u32 coremask, tmp;
 237         int err = 0;
 238
 239         if (!pc || core->bus->hosttype != BCMA_HOSTTYPE_PCI) {
 240                 /* This bcma device is not on a PCI host-bus. So the IRQs are
 241                  * not routed through the PCI core.
 242                  * So we must not enable routing through the PCI core. */
 243                 goto out;
 244         }
 245
 246         pdev = pc->core->bus->host_pci;
 247
 248         err = pci_read_config_dword(pdev, BCMA_PCI_IRQMASK, &tmp);
 249         if (err)
 250                 goto out;
 251
 252         coremask = BIT(core->core_index) << 8;
 253         if (enable)
 254                 tmp |= coremask;
 255         else
 256                 tmp &= ~coremask;
 257
 258         err = pci_write_config_dword(pdev, BCMA_PCI_IRQMASK, tmp);
 259
 260 out:
 261         return err;
 262 }
 263 EXPORT_SYMBOL_GPL(bcma_core_pci_irq_ctl);
 264
 265 void bcma_core_pci_extend_L1timer(struct bcma_drv_pci *pc, bool extend)
 266 {
 267         u32 w;
 268
 269         w = bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG);
 270         if (extend)
 271                 w |= BCMA_CORE_PCI_ASPMTIMER_EXTEND;
 272         else
 273                 w &= ~BCMA_CORE_PCI_ASPMTIMER_EXTEND;
 274         bcma_pcie_write(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG, w);
 275         bcma_pcie_read(pc, BCMA_CORE_PCI_DLLP_PMTHRESHREG);
 276 }
 277 EXPORT_SYMBOL_GPL(bcma_core_pci_extend_L1timer);