isci: Add support for probing OROM for OEM params

We need to scan the OROM for signature and grab the OEM parameters. We
also need to do the same for EFI. If all fails then we resort to user
binary blob, and if that fails then we go to the defaults.

Share the format with the create_fw utility so that all possible sources
of the parameters are in-sync.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/scsi/isci/probe_roms.c b/drivers/scsi/isci/probe_roms.c
new file mode 100644
index 000000000000..0b90e7c546c0
--- /dev/null
+++ b/drivers/scsi/isci/probe_roms.c
@@ -0,0 +1,133 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ */
+
+/* probe_roms - scan for oem parameters */
+
+#include <linux/kernel.h>
+#include <linux/firmware.h>
+#include <linux/uaccess.h>
+#include <asm/probe_roms.h>
+
+#include "isci.h"
+#include "task.h"
+#include "sci_controller_constants.h"
+#include "scic_remote_device.h"
+#include "sci_environment.h"
+#include "probe_roms.h"
+
+struct isci_orom *isci_request_oprom(struct pci_dev *pdev)
+{
+        void __iomem *oprom = pci_map_biosrom(pdev);
+        struct isci_orom *rom = NULL;
+        size_t len, i;
+
+        if (!oprom)
+                return NULL;
+
+        len = pci_biosrom_size(pdev);
+        rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL);
+
+        for (i = 0; i < len && rom; i += ISCI_ROM_SIG_SIZE) {
+                memcpy_fromio(rom->hdr.signature, oprom + i, ISCI_ROM_SIG_SIZE);
+                if (memcmp(rom->hdr.signature, ISCI_ROM_SIG,
+                           ISCI_ROM_SIG_SIZE) == 0) {
+                        size_t copy_len = min(len - i, sizeof(*rom));
+
+                        memcpy_fromio(rom, oprom + i, copy_len);
+                        break;
+                }
+        }
+
+        if (i >= len) {
+                dev_err(&pdev->dev, "oprom parse error\n");
+                devm_kfree(&pdev->dev, rom);
+                rom = NULL;
+        }
+        pci_unmap_biosrom(oprom);
+
+        return rom;
+}
+
+/**
+ * isci_parse_oem_parameters() - This method will take OEM parameters
+ *    from the module init parameters and copy them to oem_params. This will
+ *    only copy values that are not set to the module parameter default values
+ * @oem_parameters: This parameter specifies the controller default OEM
+ *    parameters. It is expected that this has been initialized to the default
+ *    parameters for the controller
+ *
+ *
+ */
+enum sci_status isci_parse_oem_parameters(union scic_oem_parameters *oem_params,
+                                          struct isci_orom *orom, int scu_index)
+{
+        int i;
+
+        /* check for valid inputs */
+        if (!(scu_index >= 0
+              && scu_index < SCI_MAX_CONTROLLERS
+              && oem_params != NULL))
+                return -EINVAL;
+
+        for (i = 0; i < SCI_MAX_PHYS; i++) {
+                oem_params->sds1.phys[i].sas_address.low =
+                        orom->ctrl[scu_index].phys[i].sas_address.low;
+                oem_params->sds1.phys[i].sas_address.high =
+                        orom->ctrl[scu_index].phys[i].sas_address.high;
+        }
+
+        for (i = 0; i < SCI_MAX_PORTS; i++)
+                oem_params->sds1.ports[i].phy_mask =
+                        orom->ctrl[scu_index].ports[i].phy_mask;
+
+        return 0;
+}
+
+struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw)
+{
+        struct isci_orom *orom = NULL, *data;
+
+        if (request_firmware(&fw, ISCI_FW_NAME, &pdev->dev) != 0)
+                return NULL;
+
+        if (fw->size < sizeof(*orom))
+                goto out;
+
+        data = (struct isci_orom *)fw->data;
+
+        if (strncmp(ISCI_ROM_SIG, data->hdr.signature,
+                    strlen(ISCI_ROM_SIG)) != 0)
+                goto out;
+
+        orom = devm_kzalloc(&pdev->dev, fw->size, GFP_KERNEL);
+        if (!orom)
+                goto out;
+
+        memcpy(orom, fw->data, fw->size);
+
+ out:
+        release_firmware(fw);
+
+        return orom;
+}