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Date: Wed, 28 Nov 2007 11:13:01 +0900
From: Tomohiro Kusumi <kusumi.tomohiro@...fujitsu.com>
To: "Kok, Auke" <auke-jan.h.kok@...el.com>, cramerj@...el.com,
john.ronciak@...el.com, jesse.brandeburg@...el.com,
jeffrey.t.kirsher@...el.com
Cc: netdev@...r.kernel.org
Subject: [PATCH][Take3] PCI legacy I/O port free driver - Making Intel e1000
driver legacy I/O port free
Dear Auke and e1000 maintainers
Hi, this is the patch which makes the e1000 driver legacy I/O port free.
I've received some advice from Auke quite long time ago, and submitted
a patch (http://lkml.org/lkml/2007/8/10/11) which I think meets what Auke
had told me. Since the patch has not received any reaction from the e1000
community, let me submit it once again (plus, the previous one had a bug
regarding module parameter).
If the module parameter enable_legacy_ioport_free is set to 0, it does
not differ from the existing e1000 driver, otherwise legacy I/O port free
function is enabled. I may have done something wrong, so any comments
would be helpful.
Tomohiro Kusumi
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@...fujitsu.com>
---
diff -Nur linux-2.6.23.org/drivers/net/e1000/e1000.h linux-2.6.23/drivers/net/e1000/e1000.h
--- linux-2.6.23.org/drivers/net/e1000/e1000.h 2007-10-16 11:30:37.000000000 +0900
+++ linux-2.6.23/drivers/net/e1000/e1000.h 2007-10-16 11:32:55.000000000 +0900
@@ -342,6 +342,9 @@
boolean_t quad_port_a;
unsigned long flags;
uint32_t eeprom_wol;
+
+ int use_ioport;
+ int bars;
};
enum e1000_state_t {
diff -Nur linux-2.6.23.org/drivers/net/e1000/e1000_main.c linux-2.6.23/drivers/net/e1000/e1000_main.c
--- linux-2.6.23.org/drivers/net/e1000/e1000_main.c 2007-10-16 11:30:38.000000000 +0900
+++ linux-2.6.23/drivers/net/e1000/e1000_main.c 2007-10-16 14:48:16.390575464 +0900
@@ -226,6 +226,11 @@
static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev);
static void e1000_io_resume(struct pci_dev *pdev);
+static unsigned int enable_legacy_ioport_free = 0;
+module_param(enable_legacy_ioport_free, uint, 0644);
+MODULE_PARM_DESC(enable_legacy_ioport_free, "Enable legacy I/O port free (default:0)");
+static int e1000_test_legacy_ioport(struct pci_dev *pdev);
+
static struct pci_error_handlers e1000_err_handler = {
.error_detected = e1000_io_error_detected,
.slot_reset = e1000_io_slot_reset,
@@ -872,8 +877,24 @@
int i, err, pci_using_dac;
uint16_t eeprom_data = 0;
uint16_t eeprom_apme_mask = E1000_EEPROM_APME;
- if ((err = pci_enable_device(pdev)))
+ int bars = 0;
+ int use_ioport = 0;
+
+ if (enable_legacy_ioport_free) {
+ if ((use_ioport = e1000_test_legacy_ioport(pdev)) < 0) {
+ E1000_ERR("e1000_test_legacy_ioport failed, aborting\n");
+ return -1;
+ }
+ if (use_ioport)
+ bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
+ else
+ bars = pci_select_bars(pdev, IORESOURCE_MEM);
+ if ((err = pci_enable_device_bars(pdev, bars)) != 0)
+ return err;
+ }
+ else if ((err = pci_enable_device(pdev)) != 0) {
return err;
+ }
if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
!(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
@@ -887,7 +908,11 @@
pci_using_dac = 0;
}
- if ((err = pci_request_regions(pdev, e1000_driver_name)))
+ if (enable_legacy_ioport_free)
+ err = pci_request_selected_regions(pdev, bars, e1000_driver_name);
+ else
+ err = pci_request_regions(pdev, e1000_driver_name);
+ if (err)
goto err_pci_reg;
pci_set_master(pdev);
@@ -906,6 +931,10 @@
adapter->pdev = pdev;
adapter->hw.back = adapter;
adapter->msg_enable = (1 << debug) - 1;
+ if (enable_legacy_ioport_free) {
+ adapter->use_ioport = use_ioport;
+ adapter->bars = bars;
+ }
mmio_start = pci_resource_start(pdev, BAR_0);
mmio_len = pci_resource_len(pdev, BAR_0);
@@ -915,12 +944,14 @@
if (!adapter->hw.hw_addr)
goto err_ioremap;
- for (i = BAR_1; i <= BAR_5; i++) {
- if (pci_resource_len(pdev, i) == 0)
- continue;
- if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
- adapter->hw.io_base = pci_resource_start(pdev, i);
- break;
+ if (!enable_legacy_ioport_free || adapter->use_ioport) {
+ for (i = BAR_1; i <= BAR_5; i++) {
+ if (pci_resource_len(pdev, i) == 0)
+ continue;
+ if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
+ adapter->hw.io_base = pci_resource_start(pdev, i);
+ break;
+ }
}
}
@@ -1188,7 +1219,10 @@
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
- pci_release_regions(pdev);
+ if (enable_legacy_ioport_free)
+ pci_release_selected_regions(pdev, bars);
+ else
+ pci_release_regions(pdev);
err_pci_reg:
err_dma:
pci_disable_device(pdev);
@@ -1240,7 +1274,10 @@
iounmap(adapter->hw.hw_addr);
if (adapter->hw.flash_address)
iounmap(adapter->hw.flash_address);
- pci_release_regions(pdev);
+ if (enable_legacy_ioport_free)
+ pci_release_selected_regions(pdev, adapter->bars);
+ else
+ pci_release_regions(pdev);
free_netdev(netdev);
@@ -5180,7 +5217,11 @@
pci_set_power_state(pdev, PCI_D0);
pci_restore_state(pdev);
- if ((err = pci_enable_device(pdev))) {
+ if (enable_legacy_ioport_free)
+ err = pci_enable_device_bars(pdev, adapter->bars);
+ else
+ err = pci_enable_device(pdev);
+ if (err) {
printk(KERN_ERR "e1000: Cannot enable PCI device from suspend\n");
return err;
}
@@ -5325,4 +5366,42 @@
}
+/*
+ * e1000_test_legacy_ioport - see if the device uses legacy I/O port
+ * @pdev: Pointer to PCI device
+ *
+ * This function tests if the PCI device uses I/O port.
+ * If yes the function returns 1, if no the function returns 0.
+ * The function returns -1 if there is an error.
+ */
+static int e1000_test_legacy_ioport(struct pci_dev *pdev)
+{
+ int ret;
+ struct e1000_hw hw;
+ memset(&hw, 0, sizeof(hw));
+
+ hw.mac_type = e1000_undefined;
+ hw.device_id = pdev->device;
+ pci_read_config_byte(pdev, PCI_REVISION_ID, &hw.revision_id);
+
+ if (e1000_set_mac_type(&hw) < 0)
+ return -1;
+
+ switch (hw.mac_type) {
+ case e1000_82540:
+ case e1000_82541:
+ case e1000_82541_rev_2:
+ case e1000_82544:
+ case e1000_82545:
+ case e1000_82546:
+ ret = 1;
+ break;
+ default:
+ ret = 0;
+ break;
+ }
+
+ return ret;
+}
+
/* e1000_main.c */
-
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