[U-Boot] [PATCH v4 02/11] x86: quark: Avoid chicken and egg problem

From: Bin Meng <bmeng.cn@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v4 02/11] x86: quark: Avoid chicken and egg problem
Date: Thu,  3 Sep 2015 05:37:24 -0700	[thread overview]
Message-ID: <1441283853-30868-3-git-send-email-bmeng.cn@gmail.com> (raw)
In-Reply-To: <1441283853-30868-1-git-send-email-bmeng.cn@gmail.com>

If we convert to use driver model pci on quark, we will encounter
some chicken and egg problems like below:

- To enable PCIe root ports, we need program some registers on the
  message bus via pci bus. With driver model, the first time to
  access pci bus, the pci enumeration process will be triggered.
  But without first enabling PCIe root ports, pci enumeration
  just hangs when scanning PCIe root ports.
- Similar situation happens when trying to access GPIO from the
  PCIe enabling codes, as GPIO requires its block base address
  to be assigned via a pci configuration register in the bridge.

To avoid such dilemma, replace all pci calls in the quark codes
to use the local version which does not go through driver model.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

---

Changes in v4: None
Changes in v3: None
Changes in v2:
- New patch to avoid chicken and egg problem

 arch/x86/cpu/quark/quark.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c
index 12ac376..2688a70 100644
--- a/arch/x86/cpu/quark/quark.c
+++ b/arch/x86/cpu/quark/quark.c
@@ -31,32 +31,32 @@ static void unprotect_spi_flash(void)
 {
 	u32 bc;
 
-	bc = x86_pci_read_config32(QUARK_LEGACY_BRIDGE, 0xd8);
+	qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, 0xd8, &bc);
 	bc |= 0x1;	/* unprotect the flash */
-	x86_pci_write_config32(QUARK_LEGACY_BRIDGE, 0xd8, bc);
+	qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, 0xd8, bc);
 }
 
 static void quark_setup_bars(void)
 {
 	/* GPIO - D31:F0:R44h */
-	pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA,
-			       CONFIG_GPIO_BASE | IO_BAR_EN);
+	qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA,
+				   CONFIG_GPIO_BASE | IO_BAR_EN);
 
 	/* ACPI PM1 Block - D31:F0:R48h */
-	pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_PM1BLK,
-			       CONFIG_ACPI_PM1_BASE | IO_BAR_EN);
+	qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_PM1BLK,
+				   CONFIG_ACPI_PM1_BASE | IO_BAR_EN);
 
 	/* GPE0 - D31:F0:R4Ch */
-	pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_GPE0BLK,
-			       CONFIG_ACPI_GPE0_BASE | IO_BAR_EN);
+	qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_GPE0BLK,
+				   CONFIG_ACPI_GPE0_BASE | IO_BAR_EN);
 
 	/* WDT - D31:F0:R84h */
-	pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_WDTBA,
-			       CONFIG_WDT_BASE | IO_BAR_EN);
+	qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_WDTBA,
+				   CONFIG_WDT_BASE | IO_BAR_EN);
 
 	/* RCBA - D31:F0:RF0h */
-	pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_RCBA,
-			       CONFIG_RCBA_BASE | MEM_BAR_EN);
+	qrk_pci_write_config_dword(QUARK_LEGACY_BRIDGE, LB_RCBA,
+				   CONFIG_RCBA_BASE | MEM_BAR_EN);
 
 	/* ACPI P Block - Msg Port 04:R70h */
 	msg_port_write(MSG_PORT_RMU, PBLK_BA,
@@ -137,10 +137,10 @@ int cpu_eth_init(bd_t *bis)
 	u32 base;
 	int ret0, ret1;
 
-	pci_read_config_dword(QUARK_EMAC0, PCI_BASE_ADDRESS_0, &base);
+	qrk_pci_read_config_dword(QUARK_EMAC0, PCI_BASE_ADDRESS_0, &base);
 	ret0 = designware_initialize(base, PHY_INTERFACE_MODE_RMII);
 
-	pci_read_config_dword(QUARK_EMAC1, PCI_BASE_ADDRESS_0, &base);
+	qrk_pci_read_config_dword(QUARK_EMAC1, PCI_BASE_ADDRESS_0, &base);
 	ret1 = designware_initialize(base, PHY_INTERFACE_MODE_RMII);
 
 	if (ret0 < 0 && ret1 < 0)
@@ -154,7 +154,7 @@ void cpu_irq_init(void)
 	struct quark_rcba *rcba;
 	u32 base;
 
-	base = x86_pci_read_config32(QUARK_LEGACY_BRIDGE, LB_RCBA);
+	qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_RCBA, &base);
 	base &= ~MEM_BAR_EN;
 	rcba = (struct quark_rcba *)base;
 
-- 
1.8.2.1
