New patch to review for coreboot: 7573993 AMD HyperTransport: Drop unused link optimisation
Kyösti Mälkki (kyosti.malkki@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8342
-gerrit
commit 757399353ad574eb51daa9a1aac9b48de1ec35f7 Author: Kyösti Mälkki kyosti.malkki@gmail.com Date: Tue Feb 3 12:18:54 2015 +0200
AMD HyperTransport: Drop unused link optimisation
Change-Id: Ia4398f6eb013c69838487bdd02d094f97d7224b6 Signed-off-by: Kyösti Mälkki kyosti.malkki@gmail.com --- src/device/hypertransport.c | 162 +------------------------------------------- 1 file changed, 1 insertion(+), 161 deletions(-)
diff --git a/src/device/hypertransport.c b/src/device/hypertransport.c index b4c070f..d27e66b 100644 --- a/src/device/hypertransport.c +++ b/src/device/hypertransport.c @@ -30,13 +30,6 @@ #include <device/pci.h> #include <device/pci_ids.h> #include <device/hypertransport.h> -#include <cpu/amd/model_fxx_rev.h> - -/* - * The hypertransport link is already optimized in pre-RAM code so don't do - * it again. - */ -#define RUN_HT_OPTIMIZE_LINK 0
struct ht_link { struct device *dev; @@ -83,156 +76,9 @@ static device_t ht_scan_get_devs(device_t *old_devices) return first; }
-static unsigned ht_read_freq_cap(device_t dev, unsigned pos) -{ - /* Handle bugs in valid hypertransport frequency reporting. */ - unsigned freq_cap; - - freq_cap = pci_read_config16(dev, pos); - freq_cap &= ~(1 << HT_FREQ_VENDOR); /* Ignore Vendor HT frequencies. */ - - /* AMD 8131 Errata 48. */ - if ((dev->vendor == PCI_VENDOR_ID_AMD) && - (dev->device == PCI_DEVICE_ID_AMD_8131_PCIX)) { - freq_cap &= ~(1 << HT_FREQ_800Mhz); - } - - /* AMD 8151 Errata 23. */ - if ((dev->vendor == PCI_VENDOR_ID_AMD) && - (dev->device == PCI_DEVICE_ID_AMD_8151_SYSCTRL)) { - freq_cap &= ~(1 << HT_FREQ_800Mhz); - } - - /* AMD K8 unsupported 1GHz? */ - if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == 0x1100)) { - if (!IS_ENABLED(CONFIG_K8_HT_FREQ_1G_SUPPORT)) - freq_cap &= ~(1 << HT_FREQ_1000Mhz); - - /* Only e0 later support 1GHz HT. */ - if (!IS_ENABLED(CONFIG_K8_REV_F_SUPPORT) && is_cpu_pre_e0()) - freq_cap &= ~(1 << HT_FREQ_1000Mhz); - } - - return freq_cap; -} - -static int ht_optimize_link() -{ - static const u8 link_width_to_pow2[] = { 3, 4, 0, 5, 1, 2, 0, 0 }; - static const u8 pow2_to_link_width[] = { 7, 4, 5, 0, 1, 3 }; - unsigned present_width_cap, upstream_width_cap; - unsigned present_freq_cap, upstream_freq_cap; - unsigned ln_present_width_in, ln_upstream_width_in; - unsigned ln_present_width_out, ln_upstream_width_out; - unsigned freq, old_freq; - unsigned present_width, upstream_width, old_width; - int reset_needed = 0; - - /* Read the capabilities. */ - present_freq_cap = - ht_read_freq_cap(cur->dev, cur->pos + cur->freq_cap_off); - upstream_freq_cap = - ht_read_freq_cap(prev->dev, prev->pos + prev->freq_cap_off); - present_width_cap = - pci_read_config8(cur->dev, cur->pos + cur->config_off); - upstream_width_cap = - pci_read_config8(prev->dev, prev->pos + prev->config_off); - - /* Calculate the highest usable frequency. */ - freq = log2(present_freq_cap & upstream_freq_cap); - - /* Calculate the highest width. */ - ln_upstream_width_in = link_width_to_pow2[upstream_width_cap & 7]; - ln_present_width_out = link_width_to_pow2[(present_width_cap >> 4) & 7]; - if (ln_upstream_width_in > ln_present_width_out) - ln_upstream_width_in = ln_present_width_out; - upstream_width = pow2_to_link_width[ln_upstream_width_in]; - present_width = pow2_to_link_width[ln_upstream_width_in] << 4; - - ln_upstream_width_out = - link_width_to_pow2[(upstream_width_cap >> 4) & 7]; - ln_present_width_in = link_width_to_pow2[present_width_cap & 7]; - if (ln_upstream_width_out > ln_present_width_in) - ln_upstream_width_out = ln_present_width_in; - upstream_width |= pow2_to_link_width[ln_upstream_width_out] << 4; - present_width |= pow2_to_link_width[ln_upstream_width_out]; - - /* Set the current device. */ - old_freq = pci_read_config8(cur->dev, cur->pos + cur->freq_off); - old_freq &= 0x0f; - if (freq != old_freq) { - unsigned new_freq; - pci_write_config8(cur->dev, cur->pos + cur->freq_off, freq); - reset_needed = 1; - printk(BIOS_SPEW, "HyperT FreqP old %x new %x\n",old_freq,freq); - new_freq = pci_read_config8(cur->dev, cur->pos + cur->freq_off); - new_freq &= 0x0f; - if (new_freq != freq) { - printk(BIOS_ERR, "%s Hypertransport frequency would " - "not set. Wanted: %x, got: %x\n", - dev_path(dev), freq, new_freq); - } - } - old_width = pci_read_config8(cur->dev, cur->pos + cur->config_off + 1); - if (present_width != old_width) { - unsigned new_width; - pci_write_config8(cur->dev, cur->pos + cur->config_off + 1, - present_width); - reset_needed = 1; - printk(BIOS_SPEW, "HyperT widthP old %x new %x\n", - old_width, present_width); - new_width = pci_read_config8(cur->dev, - cur->pos + cur->config_off + 1); - if (new_width != present_width) { - printk(BIOS_ERR, "%s Hypertransport width would not " - "set. Wanted: %x, got: %x\n", - dev_path(dev), present_width, new_width); - } - } - - /* Set the upstream device. */ - old_freq = pci_read_config8(prev->dev, prev->pos + prev->freq_off); - old_freq &= 0x0f; - if (freq != old_freq) { - unsigned new_freq; - pci_write_config8(prev->dev, prev->pos + prev->freq_off, freq); - reset_needed = 1; - printk(BIOS_SPEW, "HyperT freqU old %x new %x\n", - old_freq, freq); - new_freq = - pci_read_config8(prev->dev, prev->pos + prev->freq_off); - new_freq &= 0x0f; - if (new_freq != freq) { - printk(BIOS_ERR, "%s Hypertransport frequency would " - "not set. Wanted: %x, got: %x\n", - dev_path(prev->dev), freq, new_freq); - } - } - old_width = - pci_read_config8(prev->dev, prev->pos + prev->config_off + 1); - if (upstream_width != old_width) { - unsigned new_width; - pci_write_config8(prev->dev, prev->pos + prev->config_off + 1, - upstream_width); - reset_needed = 1; - printk(BIOS_SPEW, "HyperT widthU old %x new %x\n", old_width, - upstream_width); - new_width = pci_read_config8(prev->dev, - prev->pos + prev->config_off + 1); - if (new_width != upstream_width) { - printk(BIOS_ERR, "%s Hypertransport width would not " - "set. Wanted: %x, got: %x\n", - dev_path(prev->dev), upstream_width, new_width); - } - } - - return reset_needed; -} - static int ht_setup_link(struct ht_link *prev, device_t dev, unsigned pos) { struct ht_link cur[1]; - int reset_needed = 0; int linkb_to_host;
/* Set the hypertransport link width and frequency. */ @@ -258,9 +104,6 @@ static int ht_setup_link(struct ht_link *prev, device_t dev, unsigned pos) cur->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP1; }
- if (RUN_HT_OPTIMIZE_LINK) - reset_needed = ht_optimize_link(cur, prev); - /* * Remember the current link as the previous link, but look at the * other offsets. @@ -279,7 +122,7 @@ static int ht_setup_link(struct ht_link *prev, device_t dev, unsigned pos) prev->freq_cap_off = PCI_HT_CAP_SLAVE_FREQ_CAP0; }
- return reset_needed; + return 0; }
static unsigned ht_lookup_slave_capability(struct device *dev) @@ -578,9 +421,6 @@ unsigned int hypertransport_scan_chain(struct bus *bus, unsigned min_devfn,
end_of_chain:
- if (bus->reset_needed) - printk(BIOS_INFO, "HyperTransport reset needed\n"); - #if CONFIG_HT_CHAIN_END_UNITID_BASE != 0x20 if (offset_unitid && (ht_dev_num > 1) && (real_last_unitid != CONFIG_HT_CHAIN_END_UNITID_BASE)
-
Kyösti Mälkki