[Skiboot] [PATCH v2 2/6] VAS: Initialize the basic VAS internal registers
Sukadev Bhattiprolu
sukadev at linux.vnet.ibm.com
Wed Nov 23 13:00:44 AEDT 2016
Initialize the basic VAS internal registers that are needed for a
functioning VAS. Initializing VAS involves writing either pre-defined
values or allocated addresses to appropriate SCOM addresses.
Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
---
core/vas.c | 246 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 245 insertions(+), 1 deletion(-)
diff --git a/core/vas.c b/core/vas.c
index eefb40d..47556a0 100644
--- a/core/vas.c
+++ b/core/vas.c
@@ -13,8 +13,252 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
+#include <skiboot.h>
+#include <chip.h>
+#include <xscom.h>
#include <vas.h>
-__attrconst void init_vas(void)
+/*
+ * TODO: Set to 64K after initial development.
+ */
+static int max_win_per_chip = 16;
+static int vas_initialized;
+
+static uint64_t get_hvwc_mmio_bar(const int chipid)
+{
+ return VAS_HVWC_MMIO_BAR_BASE + chipid * VAS_HVWC_MMIO_BAR_SIZE;
+}
+
+static uint64_t get_uwc_mmio_bar(int chipid)
+{
+ return VAS_UWC_MMIO_BAR_BASE + chipid * VAS_UWC_MMIO_BAR_SIZE;
+}
+
+static inline uint64_t compute_vas_scom_addr(uint64_t ring_sat_offset)
+{
+ return VAS_SCOM_BASE_ADDR + ring_sat_offset;
+}
+
+static int vas_scom_write(struct proc_chip *chip, uint64_t reg, uint64_t val)
+{
+ return xscom_write(chip->id, compute_vas_scom_addr(reg), val);
+}
+
+static inline int vas_scom_read(struct proc_chip *chip, uint64_t reg,
+ uint64_t *val)
+{
+ return xscom_read(chip->id, compute_vas_scom_addr(reg), val);
+}
+
+static int init_north_ctl(struct proc_chip *chip)
+{
+ uint64_t val = 0ULL;
+
+ val = SETFIELD(VAS_64K_MODE_MASK, val, VAS_64K_MODE);
+ val = SETFIELD(VAS_ACCEPT_PASTE_MASK, val, VAS_ACCEPT_PASTE);
+
+ return vas_scom_write(chip, VAS_MISC_N_CTL, val);
+}
+
+static int reset_north_ctl(struct proc_chip *chip)
+{
+ return vas_scom_write(chip, VAS_MISC_N_CTL, 0ULL);
+}
+
+static void reset_fir(struct proc_chip *chip)
+{
+ uint64_t val;
+
+ val = 0x0ULL;
+ vas_scom_write(chip, VAS_FIR0, val);
+ vas_scom_write(chip, VAS_FIR1, val);
+ vas_scom_write(chip, VAS_FIR2, val);
+ vas_scom_write(chip, VAS_FIR3, val);
+ vas_scom_write(chip, VAS_FIR4, val);
+ vas_scom_write(chip, VAS_FIR5, val);
+ vas_scom_write(chip, VAS_FIR6, val);
+ vas_scom_write(chip, VAS_FIR7, val);
+}
+
+/*
+ * Initialize RMA BAR and RMA Base Address Mask Register (BAMR) to their
+ * default values. This will cause VAS to accept paste commands to all
+ * chips in the system.
+ */
+static int init_rma(struct proc_chip *chip)
+{
+ int rc;
+ uint64_t val;
+
+ val = 0ULL;
+ val = SETFIELD(VAS_RMA_BAR_ADDR_MASK, val, 0x08000000000ULL);
+
+ rc = vas_scom_write(chip, VAS_RMA_BAR, val);
+ if (rc)
+ return rc;
+
+ val = 0ULL;
+ val = SETFIELD(VAS_RMA_BAMR_ADDR_MASK, val, 0xFFFC0000000ULL);
+
+ rc = vas_scom_write(chip, VAS_RMA_BAMR, val);
+
+ return rc;
+}
+
+/*
+ * Window Context MMIO (WCM) Region for each chip is assigned in the P9
+ * MMIO MAP spreadsheet. Write this value to the SCOM address associated
+ * with WCM_BAR.
+ */
+static int init_wcm(struct proc_chip *chip)
+{
+ uint64_t wcmbar;
+
+ wcmbar = get_hvwc_mmio_bar(chip->id);
+
+ /*
+ * Write the entire WCMBAR address to the SCOM address. VAS will
+ * extract bits that it thinks are relevant i.e bits 8..38
+ */
+ return vas_scom_write(chip, VAS_WCM_BAR, wcmbar);
+}
+
+/*
+ * OS/User Window Context MMIO (UWCM) Region for each is assigned in the
+ * P9 MMIO MAP spreadsheet. Write this value to the SCOM address associated
+ * with UWCM_BAR.
+ */
+static int init_uwcm(struct proc_chip *chip)
+{
+ uint64_t uwcmbar;
+
+ uwcmbar = get_uwc_mmio_bar(chip->id);
+
+ /*
+ * Write the entire UWCMBAR address to the SCOM address. VAS will
+ * extract bits that it thinks are relevant i.e bits 8..35.
+ */
+ return vas_scom_write(chip, VAS_UWCM_BAR, uwcmbar);
+}
+
+/*
+ * VAS needs a backing store for the 64K window contexts on a chip.
+ * (64K times 512 = 8MB). This region needs to be contiguous, so
+ * allocate during early boot. Then write the allocated address to
+ * the SCOM address for the Backing store BAR.
+ */
+static int init_wcbs(struct proc_chip *chip)
+{
+ uint64_t wcbs;
+ size_t size;
+
+ /* align to the backing store size */
+ size = (size_t)VAS_WCBS_SIZE;
+ wcbs = (uint64_t)local_alloc(chip->id, size, size);
+ if (!wcbs)
+ return -ENOMEM;
+
+ /*
+ * Write entire WCBS_BAR address to the SCOM address. VAS will extract
+ * relevant bits.
+ */
+ return vas_scom_write(chip, VAS_WCBS_BAR, wcbs);
+}
+
+/*
+ * A VAS Window context is a 512-byte area made up of a set of 64-bit
+ * registers. But not all registers (eg: 0, 1, 7 etc) are valid and
+ * hence should not be written to.
+ *
+ * Use the following bitmask to identify valid offsets in the window
+ * context. Refer to Table 3.2 in the VAS workbook for list of valid
+ * offsets.
+ */
+uint64_t valid_wcm_mask = 0x00D71FFF13F7D77CULL;
+
+/*
+ * Init all registers in one window context
+ */
+static int init_one_window(struct proc_chip *chip, int idx)
{
+ uint64_t wcmbar;
+ uint64_t *window_start;
+ int reg, nregs;
+
+ if (idx >= max_win_per_chip)
+ return -1;
+
+ wcmbar = get_hvwc_mmio_bar(chip->id);
+ window_start = (uint64_t *)wcmbar + idx * VAS_WC_SIZE;
+ nregs = VAS_WC_SIZE / sizeof(uint64_t);
+
+ for (reg = 0; reg < nregs; reg++) {
+ if (!((valid_wcm_mask >> reg) & 0x1))
+ continue;
+
+ *(window_start + reg) = 0x0ULL;
+ }
+
+ return 0;
+}
+
+static int init_windows(struct proc_chip *chip)
+{
+ int i, rc;
+
+ for (i = 0; i < max_win_per_chip; i++) {
+ rc = init_one_window(chip, i);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static int init_one_chip(struct proc_chip *chip)
+{
+ if (init_wcbs(chip) || init_wcm(chip) || init_uwcm(chip))
+ return -1;
+
+ reset_fir(chip);
+
+ if (init_north_ctl(chip))
+ return -1;
+
+ if (init_rma(chip) || init_windows(chip))
+ goto out;
+
+ printf("VAS: Initialized chip %d\n", chip->id);
+ return 0;
+
+out:
+ reset_north_ctl(chip);
+ return -1;
+}
+
+void init_vas()
+{
+ int ct;
+ struct proc_chip *chip;
+
+ chip = next_chip(NULL);
+ ct = chip->type;
+
+ if (ct != PROC_CHIP_P9_CUMULUS && ct != PROC_CHIP_P9_NIMBUS)
+ return;
+
+ for_each_chip(chip) {
+ if (init_one_chip(chip))
+ goto cleanup;
+ }
+
+ vas_initialized = 1;
+ printf("VAS: Intialized\n");
+ return;
+
+cleanup:
+ /* ensure none of the chips accept paste instructions */
+ for_each_chip(chip)
+ reset_north_ctl(chip);
+ return;
}
--
2.7.4
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