summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/bcm43xx/bcm43xx_power.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/wireless/bcm43xx/bcm43xx_power.c')
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_power.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_power.c b/drivers/net/wireless/bcm43xx/bcm43xx_power.c
new file mode 100644
index 00000000000..3c92b62807c
--- /dev/null
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_power.c
@@ -0,0 +1,358 @@
+/*
+
+ Broadcom BCM43xx wireless driver
+
+ Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
+ Stefano Brivio <st3@riseup.net>
+ Michael Buesch <mbuesch@freenet.de>
+ Danny van Dyk <kugelfang@gentoo.org>
+ Andreas Jaggi <andreas.jaggi@waterwave.ch>
+
+ Some parts of the code in this file are derived from the ipw2200
+ driver Copyright(c) 2003 - 2004 Intel Corporation.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+
+*/
+
+#include <linux/delay.h>
+
+#include "bcm43xx.h"
+#include "bcm43xx_power.h"
+#include "bcm43xx_main.h"
+
+
+/* Get max/min slowclock frequency
+ * as described in http://bcm-specs.sipsolutions.net/PowerControl
+ */
+static int bcm43xx_pctl_clockfreqlimit(struct bcm43xx_private *bcm,
+ int get_max)
+{
+ int limit = 0;
+ int divisor;
+ int selection;
+ int err;
+ u32 tmp;
+ struct bcm43xx_coreinfo *old_core;
+
+ if (!(bcm->chipcommon_capabilities & BCM43xx_CAPABILITIES_PCTL))
+ goto out;
+ old_core = bcm->current_core;
+ err = bcm43xx_switch_core(bcm, &bcm->core_chipcommon);
+ if (err)
+ goto out;
+
+ if (bcm->current_core->rev < 6) {
+ if ((bcm->bustype == BCM43xx_BUSTYPE_PCMCIA) ||
+ (bcm->bustype == BCM43xx_BUSTYPE_SB)) {
+ selection = 1;
+ divisor = 32;
+ } else {
+ err = bcm43xx_pci_read_config32(bcm, BCM43xx_PCTL_OUT, &tmp);
+ if (err) {
+ printk(KERN_ERR PFX "clockfreqlimit pcicfg read failure\n");
+ goto out_switchback;
+ }
+ if (tmp & 0x10) {
+ /* PCI */
+ selection = 2;
+ divisor = 64;
+ } else {
+ /* XTAL */
+ selection = 1;
+ divisor = 32;
+ }
+ }
+ } else if (bcm->current_core->rev < 10) {
+ selection = (tmp & 0x07);
+ if (selection) {
+ tmp = bcm43xx_read32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL);
+ divisor = 4 * (1 + ((tmp & 0xFFFF0000) >> 16));
+ } else
+ divisor = 1;
+ } else {
+ tmp = bcm43xx_read32(bcm, BCM43xx_CHIPCOMMON_SYSCLKCTL);
+ divisor = 4 * (1 + ((tmp & 0xFFFF0000) >> 16));
+ selection = 1;
+ }
+
+ switch (selection) {
+ case 0:
+ /* LPO */
+ if (get_max)
+ limit = 43000;
+ else
+ limit = 25000;
+ break;
+ case 1:
+ /* XTAL */
+ if (get_max)
+ limit = 20200000;
+ else
+ limit = 19800000;
+ break;
+ case 2:
+ /* PCI */
+ if (get_max)
+ limit = 34000000;
+ else
+ limit = 25000000;
+ break;
+ default:
+ assert(0);
+ }
+ limit /= divisor;
+
+out_switchback:
+ err = bcm43xx_switch_core(bcm, old_core);
+ assert(err == 0);
+
+out:
+ return limit;
+}
+
+/* init power control
+ * as described in http://bcm-specs.sipsolutions.net/PowerControl
+ */
+int bcm43xx_pctl_init(struct bcm43xx_private *bcm)
+{
+ int err, maxfreq;
+ struct bcm43xx_coreinfo *old_core;
+
+ if (!(bcm->chipcommon_capabilities & BCM43xx_CAPABILITIES_PCTL))
+ return 0;
+ old_core = bcm->current_core;
+ err = bcm43xx_switch_core(bcm, &bcm->core_chipcommon);
+ if (err == -ENODEV)
+ return 0;
+ if (err)
+ goto out;
+
+ maxfreq = bcm43xx_pctl_clockfreqlimit(bcm, 1);
+ bcm43xx_write32(bcm, BCM43xx_CHIPCOMMON_PLLONDELAY,
+ (maxfreq * 150 + 999999) / 1000000);
+ bcm43xx_write32(bcm, BCM43xx_CHIPCOMMON_FREFSELDELAY,
+ (maxfreq * 15 + 999999) / 1000000);
+
+ err = bcm43xx_switch_core(bcm, old_core);
+ assert(err == 0);
+
+out:
+ return err;
+}
+
+u16 bcm43xx_pctl_powerup_delay(struct bcm43xx_private *bcm)
+{
+ u16 delay = 0;
+ int err;
+ u32 pll_on_delay;
+ struct bcm43xx_coreinfo *old_core;
+ int minfreq;
+
+ if (bcm->bustype != BCM43xx_BUSTYPE_PCI)
+ goto out;
+ if (!(bcm->chipcommon_capabilities & BCM43xx_CAPABILITIES_PCTL))
+ goto out;
+ old_core = bcm->current_core;
+ err = bcm43xx_switch_core(bcm, &bcm->core_chipcommon);
+ if (err == -ENODEV)
+ goto out;
+
+ minfreq = bcm43xx_pctl_clockfreqlimit(bcm, 0);
+ pll_on_delay = bcm43xx_read32(bcm, BCM43xx_CHIPCOMMON_PLLONDELAY);
+ delay = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
+
+ err = bcm43xx_switch_core(bcm, old_core);
+ assert(err == 0);
+
+out:
+ return delay;
+}
+
+/* set the powercontrol clock
+ * as described in http://bcm-specs.sipsolutions.net/PowerControl
+ */
+int bcm43xx_pctl_set_clock(struct bcm43xx_private *bcm, u16 mode)
+{
+ int err;
+ struct bcm43xx_coreinfo *old_core;
+ u32 tmp;
+
+ old_core = bcm->current_core;
+ err = bcm43xx_switch_core(bcm, &bcm->core_chipcommon);
+ if (err == -ENODEV)
+ return 0;
+ if (err)
+ goto out;
+
+ if (bcm->core_chipcommon.rev < 6) {
+ if (mode == BCM43xx_PCTL_CLK_FAST) {
+ err = bcm43xx_pctl_set_crystal(bcm, 1);
+ if (err)
+ goto out;
+ }
+ } else {
+ if ((bcm->chipcommon_capabilities & BCM43xx_CAPABILITIES_PCTL) &&
+ (bcm->core_chipcommon.rev < 10)) {
+ switch (mode) {
+ case BCM43xx_PCTL_CLK_FAST:
+ tmp = bcm43xx_read32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL);
+ tmp = (tmp & ~BCM43xx_PCTL_FORCE_SLOW) | BCM43xx_PCTL_FORCE_PLL;
+ bcm43xx_write32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL, tmp);
+ break;
+ case BCM43xx_PCTL_CLK_SLOW:
+ tmp = bcm43xx_read32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL);
+ tmp |= BCM43xx_PCTL_FORCE_SLOW;
+ bcm43xx_write32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL, tmp);
+ break;
+ case BCM43xx_PCTL_CLK_DYNAMIC:
+ tmp = bcm43xx_read32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL);
+ tmp &= ~BCM43xx_PCTL_FORCE_SLOW;
+ tmp |= BCM43xx_PCTL_FORCE_PLL;
+ tmp &= ~BCM43xx_PCTL_DYN_XTAL;
+ bcm43xx_write32(bcm, BCM43xx_CHIPCOMMON_SLOWCLKCTL, tmp);
+ }
+ }
+ }
+
+ err = bcm43xx_switch_core(bcm, old_core);
+ assert(err == 0);
+
+out:
+ return err;
+}
+
+int bcm43xx_pctl_set_crystal(struct bcm43xx_private *bcm, int on)
+{
+ int err;
+ u32 in, out, outenable;
+
+ err = bcm43xx_pci_read_config32(bcm, BCM43xx_PCTL_IN, &in);
+ if (err)
+ goto err_pci;
+ err = bcm43xx_pci_read_config32(bcm, BCM43xx_PCTL_OUT, &out);
+ if (err)
+ goto err_pci;
+ err = bcm43xx_pci_read_config32(bcm, BCM43xx_PCTL_OUTENABLE, &outenable);
+ if (err)
+ goto err_pci;
+
+ outenable |= (BCM43xx_PCTL_XTAL_POWERUP | BCM43xx_PCTL_PLL_POWERDOWN);
+
+ if (on) {
+ if (in & 0x40)
+ return 0;
+
+ out |= (BCM43xx_PCTL_XTAL_POWERUP | BCM43xx_PCTL_PLL_POWERDOWN);
+
+ err = bcm43xx_pci_write_config32(bcm, BCM43xx_PCTL_OUT, out);
+ if (err)
+ goto err_pci;
+ err = bcm43xx_pci_write_config32(bcm, BCM43xx_PCTL_OUTENABLE, outenable);
+ if (err)
+ goto err_pci;
+ udelay(1000);
+
+ out &= ~BCM43xx_PCTL_PLL_POWERDOWN;
+ err = bcm43xx_pci_write_config32(bcm, BCM43xx_PCTL_OUT, out);
+ if (err)
+ goto err_pci;
+ udelay(5000);
+ } else {
+ if (bcm->current_core->rev < 5)
+ return 0;
+ if (bcm->sprom.boardflags & BCM43xx_BFL_XTAL_NOSLOW)
+ return 0;
+
+/* XXX: Why BCM43xx_MMIO_RADIO_HWENABLED_xx can't be read at this time?
+ * err = bcm43xx_switch_core(bcm, bcm->active_80211_core);
+ * if (err)
+ * return err;
+ * if (((bcm->current_core->rev >= 3) &&
+ * (bcm43xx_read32(bcm, BCM43xx_MMIO_RADIO_HWENABLED_HI) & (1 << 16))) ||
+ * ((bcm->current_core->rev < 3) &&
+ * !(bcm43xx_read16(bcm, BCM43xx_MMIO_RADIO_HWENABLED_LO) & (1 << 4))))
+ * return 0;
+ * err = bcm43xx_switch_core(bcm, &bcm->core_chipcommon);
+ * if (err)
+ * return err;
+ */
+
+ err = bcm43xx_pctl_set_clock(bcm, BCM43xx_PCTL_CLK_SLOW);
+ if (err)
+ goto out;
+ out &= ~BCM43xx_PCTL_XTAL_POWERUP;
+ out |= BCM43xx_PCTL_PLL_POWERDOWN;
+ err = bcm43xx_pci_write_config32(bcm, BCM43xx_PCTL_OUT, out);
+ if (err)
+ goto err_pci;
+ err = bcm43xx_pci_write_config32(bcm, BCM43xx_PCTL_OUTENABLE, outenable);
+ if (err)
+ goto err_pci;
+ }
+
+out:
+ return err;
+
+err_pci:
+ printk(KERN_ERR PFX "Error: pctl_set_clock() could not access PCI config space!\n");
+ err = -EBUSY;
+ goto out;
+}
+
+/* Set the PowerSavingControlBits.
+ * Bitvalues:
+ * 0 => unset the bit
+ * 1 => set the bit
+ * -1 => calculate the bit
+ */
+void bcm43xx_power_saving_ctl_bits(struct bcm43xx_private *bcm,
+ int bit25, int bit26)
+{
+ int i;
+ u32 status;
+
+//FIXME: Force 25 to off and 26 to on for now:
+bit25 = 0;
+bit26 = 1;
+
+ if (bit25 == -1) {
+ //TODO: If powersave is not off and FIXME is not set and we are not in adhoc
+ // and thus is not an AP and we are associated, set bit 25
+ }
+ if (bit26 == -1) {
+ //TODO: If the device is awake or this is an AP, or we are scanning, or FIXME,
+ // or we are associated, or FIXME, or the latest PS-Poll packet sent was
+ // successful, set bit26
+ }
+ status = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
+ if (bit25)
+ status |= BCM43xx_SBF_PS1;
+ else
+ status &= ~BCM43xx_SBF_PS1;
+ if (bit26)
+ status |= BCM43xx_SBF_PS2;
+ else
+ status &= ~BCM43xx_SBF_PS2;
+ bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, status);
+ if (bit26 && bcm->current_core->rev >= 5) {
+ for (i = 0; i < 100; i++) {
+ if (bcm43xx_shm_read32(bcm, BCM43xx_SHM_SHARED, 0x0040) != 4)
+ break;
+ udelay(10);
+ }
+ }
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-08 17:02:26 +0000