arm: socfpga: soc64: Add ATF support for FPGA reconfig driver

In non-secure mode (EL2), FPGA reconfiguration driver calls the
SMC/PSCI services provided by ATF to configure the FPGA.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>

diff --git a/drivers/fpga/intel_sdm_mb.c b/drivers/fpga/intel_sdm_mb.c
index 9a1dc2c..f5fd9a1 100644 (file)
--- a/drivers/fpga/intel_sdm_mb.c
+++ b/drivers/fpga/intel_sdm_mb.c
@@ -8,11 +8,149 @@
 #include <log.h>
 #include <watchdog.h>
 #include <asm/arch/mailbox_s10.h>
+#include <asm/arch/smc_api.h>
 #include <linux/delay.h>
+#include <linux/intel-smc.h>
 
 #define RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS           60000
 #define RECONFIG_STATUS_INTERVAL_DELAY_US              1000000
 
+#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ATF)
+
+#define BITSTREAM_CHUNK_SIZE                           0xFFFF0
+#define RECONFIG_STATUS_POLL_RETRY_MAX                 100
+
+/*
+ * Polling the FPGA configuration status.
+ * Return 0 for success, non-zero for error.
+ */
+static int reconfig_status_polling_resp(void)
+{
+       int ret;
+       unsigned long start = get_timer(0);
+
+       while (1) {
+               ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE, NULL, 0,
+                                NULL, 0);
+
+               if (!ret)
+                       return 0;       /* configuration success */
+
+               if (ret != INTEL_SIP_SMC_STATUS_BUSY)
+                       return ret;
+
+               if (get_timer(start) > RECONFIG_STATUS_POLL_RESP_TIMEOUT_MS)
+                       return -ETIMEDOUT;      /* time out */
+
+               puts(".");
+               udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);
+               WATCHDOG_RESET();
+       }
+
+       return -ETIMEDOUT;
+}
+
+static int send_bitstream(const void *rbf_data, size_t rbf_size)
+{
+       int i;
+       u64 res_buf[3];
+       u64 args[2];
+       u32 xfer_count = 0;
+       int ret, wr_ret = 0, retry = 0;
+       size_t buf_size = (rbf_size > BITSTREAM_CHUNK_SIZE) ?
+                               BITSTREAM_CHUNK_SIZE : rbf_size;
+
+       while (rbf_size || xfer_count) {
+               if (!wr_ret && rbf_size) {
+                       args[0] = (u64)rbf_data;
+                       args[1] = buf_size;
+                       wr_ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_WRITE,
+                                           args, 2, NULL, 0);
+
+                       debug("wr_ret = %d, rbf_data = %p, buf_size = %08lx\n",
+                             wr_ret, rbf_data, buf_size);
+
+                       if (wr_ret)
+                               continue;
+
+                       rbf_size -= buf_size;
+                       rbf_data += buf_size;
+
+                       if (buf_size >= rbf_size)
+                               buf_size = rbf_size;
+
+                       xfer_count++;
+                       puts(".");
+               } else {
+                       ret = invoke_smc(
+                               INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE,
+                               NULL, 0, res_buf, ARRAY_SIZE(res_buf));
+                       if (!ret) {
+                               for (i = 0; i < ARRAY_SIZE(res_buf); i++) {
+                                       if (!res_buf[i])
+                                               break;
+                                       xfer_count--;
+                                       wr_ret = 0;
+                                       retry = 0;
+                               }
+                       } else if (ret !=
+                                  INTEL_SIP_SMC_STATUS_BUSY)
+                               return ret;
+                       else if (!xfer_count)
+                               return INTEL_SIP_SMC_STATUS_ERROR;
+
+                       if (++retry >= RECONFIG_STATUS_POLL_RETRY_MAX)
+                               return -ETIMEDOUT;
+
+                       udelay(20000);
+               }
+               WATCHDOG_RESET();
+       }
+
+       return 0;
+}
+
+/*
+ * This is the interface used by FPGA driver.
+ * Return 0 for success, non-zero for error.
+ */
+int intel_sdm_mb_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
+{
+       int ret;
+       u64 arg = 1;
+
+       debug("Invoking FPGA_CONFIG_START...\n");
+
+       ret = invoke_smc(INTEL_SIP_SMC_FPGA_CONFIG_START, &arg, 1, NULL, 0);
+
+       if (ret) {
+               puts("Failure in RECONFIG mailbox command!\n");
+               return ret;
+       }
+
+       ret = send_bitstream(rbf_data, rbf_size);
+       if (ret) {
+               puts("Error sending bitstream!\n");
+               return ret;
+       }
+
+       /* Make sure we don't send MBOX_RECONFIG_STATUS too fast */
+       udelay(RECONFIG_STATUS_INTERVAL_DELAY_US);
+
+       debug("Polling with MBOX_RECONFIG_STATUS...\n");
+       ret = reconfig_status_polling_resp();
+       if (ret) {
+               puts("FPGA reconfiguration failed!");
+               return ret;
+       }
+
+       puts("FPGA reconfiguration OK!\n");
+
+       return ret;
+}
+
+#else
+
 static const struct mbox_cfgstat_state {
        int                     err_no;
        const char              *error_name;
@@ -286,3 +424,4 @@ int intel_sdm_mb_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
 
        return ret;
 }
+#endif