#define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2 0x2
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK 0xf
+#define PCIE_RC_LCSR 0x80
+
/* PCIe Port Logic registers (memory-mapped) */
#define PL_OFFSET 0x700
#define PCIE_PL_PFLR (PL_OFFSET + 0x08)
return -EINVAL;
}
+static int imx6_pcie_wait_for_speed_change(struct pcie_port *pp)
+{
+ u32 tmp;
+ unsigned int retries;
+
+ for (retries = 0; retries < 200; retries++) {
+ tmp = readl(pp->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
+ /* Test if the speed change finished. */
+ if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
+ return 0;
+ usleep_range(100, 1000);
+ }
+
+ dev_err(pp->dev, "Speed change timeout\n");
+ return -EINVAL;
+}
+
static irqreturn_t imx6_pcie_msi_handler(int irq, void *arg)
{
struct pcie_port *pp = arg;
static int imx6_pcie_establish_link(struct pcie_port *pp)
{
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
- uint32_t tmp;
- int ret, count;
+ u32 tmp;
+ int ret;
/*
* Force Gen1 operation when starting the link. In case the link is
tmp |= PORT_LOGIC_SPEED_CHANGE;
writel(tmp, pp->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
- count = 200;
- while (count--) {
- tmp = readl(pp->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
- /* Test if the speed change finished. */
- if (!(tmp & PORT_LOGIC_SPEED_CHANGE))
- break;
- usleep_range(100, 1000);
+ ret = imx6_pcie_wait_for_speed_change(pp);
+ if (ret) {
+ dev_err(pp->dev, "Failed to bring link up!\n");
+ return ret;
}
/* Make sure link training is finished as well! */
- if (count)
- ret = imx6_pcie_wait_for_link(pp);
- else
- ret = -EINVAL;
-
+ ret = imx6_pcie_wait_for_link(pp);
if (ret) {
dev_err(pp->dev, "Failed to bring link up!\n");
- } else {
- tmp = readl(pp->dbi_base + 0x80);
- dev_dbg(pp->dev, "Link up, Gen=%i\n", (tmp >> 16) & 0xf);
+ return ret;
}
- return ret;
+ tmp = readl(pp->dbi_base + PCIE_RC_LCSR);
+ dev_dbg(pp->dev, "Link up, Gen=%i\n", (tmp >> 16) & 0xf);
+ return 0;
}
static void imx6_pcie_host_init(struct pcie_port *pp)
static void imx6_pcie_reset_phy(struct pcie_port *pp)
{
- uint32_t temp;
+ u32 tmp;
- pcie_phy_read(pp->dbi_base, PHY_RX_OVRD_IN_LO, &temp);
- temp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
- PHY_RX_OVRD_IN_LO_RX_PLL_EN);
- pcie_phy_write(pp->dbi_base, PHY_RX_OVRD_IN_LO, temp);
+ pcie_phy_read(pp->dbi_base, PHY_RX_OVRD_IN_LO, &tmp);
+ tmp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
+ PHY_RX_OVRD_IN_LO_RX_PLL_EN);
+ pcie_phy_write(pp->dbi_base, PHY_RX_OVRD_IN_LO, tmp);
usleep_range(2000, 3000);
- pcie_phy_read(pp->dbi_base, PHY_RX_OVRD_IN_LO, &temp);
- temp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN |
+ pcie_phy_read(pp->dbi_base, PHY_RX_OVRD_IN_LO, &tmp);
+ tmp &= ~(PHY_RX_OVRD_IN_LO_RX_DATA_EN |
PHY_RX_OVRD_IN_LO_RX_PLL_EN);
- pcie_phy_write(pp->dbi_base, PHY_RX_OVRD_IN_LO, temp);
+ pcie_phy_write(pp->dbi_base, PHY_RX_OVRD_IN_LO, tmp);
}
static int imx6_pcie_link_up(struct pcie_port *pp)