x86: Enable PCIe controller on quark/galileo

[karo-tx-uboot.git] / board / intel / galileo / galileo.c

diff --git a/board/intel/galileo/galileo.c b/board/intel/galileo/galileo.c
index 746ab277cb35c67645b8d454ce79a86afcc5e4fa..c1087acb690a0b1bfe7cedae51e723f19c242b6c 100644 (file)
--- a/board/intel/galileo/galileo.c
+++ b/board/intel/galileo/galileo.c
@@ -5,12 +5,68 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
+#include <asm/arch/device.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/quark.h>
 
 int board_early_init_f(void)
 {
        return 0;
 }
 
+/*
+ * Intel Galileo gen2 board uses GPIO Resume Well bank pin0 as the PERST# pin.
+ *
+ * We cannot use any public GPIO APIs in <asm-generic/gpio.h> to control this
+ * pin, as these APIs will eventually call into gpio_ich6_ofdata_to_platdata()
+ * in the Intel ICH6 GPIO driver where it calls PCI configuration space access
+ * APIs which will trigger PCI enumeration process.
+ *
+ * Check <asm/arch-quark/quark.h> for more details.
+ */
+void board_assert_perst(void)
+{
+       u32 base, port, val;
+
+       /* retrieve the GPIO IO base */
+       qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, PCI_CFG_GPIOBASE, &base);
+       base = (base & 0xffff) & ~0x7f;
+
+       /* enable the pin */
+       port = base + 0x20;
+       val = inl(port);
+       val |= (1 << 0);
+       outl(val, port);
+
+       /* configure the pin as output */
+       port = base + 0x24;
+       val = inl(port);
+       val &= ~(1 << 0);
+       outl(val, port);
+
+       /* pull it down (assert) */
+       port = base + 0x28;
+       val = inl(port);
+       val &= ~(1 << 0);
+       outl(val, port);
+}
+
+void board_deassert_perst(void)
+{
+       u32 base, port, val;
+
+       /* retrieve the GPIO IO base */
+       qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, PCI_CFG_GPIOBASE, &base);
+       base = (base & 0xffff) & ~0x7f;
+
+       /* pull it up (de-assert) */
+       port = base + 0x28;
+       val = inl(port);
+       val |= (1 << 0);
+       outl(val, port);
+}
+
 void setup_pch_gpios(u16 gpiobase, const struct pch_gpio_map *gpio)
 {
        return;