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@@ -1,246 +0,0 @@
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-/*
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- * Initialize Owl Emulation Devices
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- *
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- * Copyright (C) 2016 Christian Lamparter <[email protected]>
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- * Copyright (C) 2016 Martin Blumenstingl <[email protected]>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published
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- * by the Free Software Foundation.
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- *
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- * Some devices (like the Cisco Meraki Z1 Cloud Managed Teleworker Gateway)
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- * need to be able to initialize the PCIe wifi device. Normally, this is done
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- * during the early stages of booting linux, because the necessary init code
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- * is read from the memory mapped SPI and passed to pci_enable_ath9k_fixup.
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- * However,this isn't possible for devices which have the init code for the
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- * Atheros chip stored on NAND. Hence, this module can be used to initialze
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- * the chip when the user-space is ready to extract the init code.
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- */
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-#include <linux/module.h>
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-#include <linux/version.h>
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-#include <linux/completion.h>
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-#include <linux/etherdevice.h>
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-#include <linux/firmware.h>
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-#include <linux/pci.h>
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-#include <linux/delay.h>
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-#include <linux/platform_device.h>
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-#include <linux/ath9k_platform.h>
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-
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-struct owl_ctx {
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- struct completion eeprom_load;
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-};
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-
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-#define EEPROM_FILENAME_LEN 100
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-
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-#define AR5416_EEPROM_MAGIC 0xa55a
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-
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-static int ath9k_pci_fixup(struct pci_dev *pdev, const u16 *cal_data,
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- size_t cal_len)
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-{
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- void __iomem *mem;
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- const void *cal_end = (void *)cal_data + cal_len;
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- const struct {
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- u16 reg;
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- u16 low_val;
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- u16 high_val;
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- } __packed *data;
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- u16 cmd;
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- u32 bar0;
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- bool swap_needed = false;
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-
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- if (*cal_data != AR5416_EEPROM_MAGIC) {
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- if (*cal_data != swab16(AR5416_EEPROM_MAGIC)) {
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- dev_err(&pdev->dev, "invalid calibration data\n");
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- return -EINVAL;
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- }
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-
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- dev_dbg(&pdev->dev, "calibration data needs swapping\n");
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- swap_needed = true;
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- }
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-
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- dev_info(&pdev->dev, "fixup device configuration\n");
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-
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- mem = pcim_iomap(pdev, 0, 0);
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- if (!mem) {
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- dev_err(&pdev->dev, "ioremap error\n");
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- return -EINVAL;
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- }
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-
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- pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &bar0);
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- pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0,
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- pci_resource_start(pdev, 0));
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- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
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- cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
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- pci_write_config_word(pdev, PCI_COMMAND, cmd);
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-
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- /* set pointer to first reg address */
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- for (data = (const void *) (cal_data + 3);
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- (const void *) data <= cal_end && data->reg != (u16)~0;
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- data++) {
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- u32 val;
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- u16 reg;
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-
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- reg = data->reg;
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- val = data->low_val;
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- val |= ((u32)data->high_val) << 16;
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-
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- if (swap_needed) {
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- reg = swab16(reg);
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- val = swahb32(val);
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- }
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-
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-#ifdef CONFIG_LANTIQ
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- val = swab32(val);
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-#endif
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-
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- __raw_writel(val, mem + reg);
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- udelay(100);
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- }
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-
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- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
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- cmd &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
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- pci_write_config_word(pdev, PCI_COMMAND, cmd);
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-
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- pci_write_config_dword(pdev, PCI_BASE_ADDRESS_0, bar0);
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- pcim_iounmap(pdev, mem);
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-
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- pci_disable_device(pdev);
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-
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- return 0;
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-}
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-
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-static void owl_fw_cb(const struct firmware *fw, void *context)
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-{
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- struct pci_dev *pdev = (struct pci_dev *) context;
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- struct owl_ctx *ctx = (struct owl_ctx *) pci_get_drvdata(pdev);
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- struct ath9k_platform_data *pdata = dev_get_platdata(&pdev->dev);
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- struct pci_bus *bus;
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-
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- complete(&ctx->eeprom_load);
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-
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- if (!fw) {
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- dev_err(&pdev->dev, "no eeprom data received.\n");
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- goto release;
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- }
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-
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- /* also note that we are doing *u16 operations on the file */
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- if (fw->size > sizeof(pdata->eeprom_data) || fw->size < 0x200 ||
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- (fw->size & 1) == 1) {
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- dev_err(&pdev->dev, "eeprom file has an invalid size.\n");
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- goto release;
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- }
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-
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- if (pdata) {
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- memcpy(pdata->eeprom_data, fw->data, fw->size);
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-
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- /*
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- * eeprom has been successfully loaded - pass the data to ath9k
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- * but remove the eeprom_name, so it doesn't try to load it too.
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- */
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- pdata->eeprom_name = NULL;
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- }
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-
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- if (ath9k_pci_fixup(pdev, (const u16 *) fw->data, fw->size))
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- goto release;
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-
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- pci_lock_rescan_remove();
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- bus = pdev->bus;
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- pci_stop_and_remove_bus_device(pdev);
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- /*
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- * the device should come back with the proper
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- * ProductId. But we have to initiate a rescan.
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- */
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- pci_rescan_bus(bus);
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- pci_unlock_rescan_remove();
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-
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-release:
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- release_firmware(fw);
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-}
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-
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-static const char *owl_get_eeprom_name(struct pci_dev *pdev)
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-{
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- struct device *dev = &pdev->dev;
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- struct ath9k_platform_data *pdata;
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- char *eeprom_name;
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-
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- /* try the existing platform data first */
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- pdata = dev_get_platdata(dev);
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- if (pdata && pdata->eeprom_name)
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- return pdata->eeprom_name;
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-
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- dev_dbg(dev, "using auto-generated eeprom filename\n");
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-
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- eeprom_name = devm_kzalloc(dev, EEPROM_FILENAME_LEN, GFP_KERNEL);
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- if (!eeprom_name)
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- return NULL;
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-
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- /* this should match the pattern used in ath9k/init.c */
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- scnprintf(eeprom_name, EEPROM_FILENAME_LEN, "ath9k-eeprom-pci-%s.bin",
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- dev_name(dev));
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-
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- return eeprom_name;
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-}
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-
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-static int owl_probe(struct pci_dev *pdev,
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- const struct pci_device_id *id)
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-{
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- struct owl_ctx *ctx;
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- const char *eeprom_name;
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- int err = 0;
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-
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- if (pcim_enable_device(pdev))
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- return -EIO;
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-
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- pcim_pin_device(pdev);
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-
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- eeprom_name = owl_get_eeprom_name(pdev);
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- if (!eeprom_name) {
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- dev_err(&pdev->dev, "no eeprom filename found.\n");
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- return -ENODEV;
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- }
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-
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- ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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- if (!ctx) {
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- dev_err(&pdev->dev, "failed to alloc device context.\n");
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- return -ENOMEM;
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- }
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- init_completion(&ctx->eeprom_load);
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-
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- pci_set_drvdata(pdev, ctx);
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- err = request_firmware_nowait(THIS_MODULE, true, eeprom_name,
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- &pdev->dev, GFP_KERNEL, pdev, owl_fw_cb);
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- if (err) {
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- dev_err(&pdev->dev, "failed to request caldata (%d).\n", err);
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- kfree(ctx);
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- }
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- return err;
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-}
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-
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-static void owl_remove(struct pci_dev *pdev)
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-{
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- struct owl_ctx *ctx = pci_get_drvdata(pdev);
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-
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- if (ctx) {
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- wait_for_completion(&ctx->eeprom_load);
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- pci_set_drvdata(pdev, NULL);
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- kfree(ctx);
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- }
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-}
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-
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-static const struct pci_device_id owl_pci_table[] = {
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- { PCI_VDEVICE(ATHEROS, 0xff1c) }, /* PCIe */
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- { PCI_VDEVICE(ATHEROS, 0xff1d) }, /* PCI */
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- { },
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-};
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-MODULE_DEVICE_TABLE(pci, owl_pci_table);
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-
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-static struct pci_driver owl_driver = {
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- .name = "owl-loader",
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- .id_table = owl_pci_table,
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- .probe = owl_probe,
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- .remove = owl_remove,
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-};
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-module_pci_driver(owl_driver);
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-MODULE_AUTHOR("Christian Lamparter <[email protected]>");
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-MODULE_DESCRIPTION("Initializes Atheros' Owl Emulation devices");
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-MODULE_LICENSE("GPL v2");
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Christian Lamparter