+// SPDX-License-Identifier: GPL-2.0
/*
* Freescale i.MX6 PCI Express Root-Complex driver
*
* Based on upstream Linux kernel driver:
* pci-imx6.c: Sean Cross <xobs@kosagi.com>
* pcie-designware.c: Jingoo Han <jg1.han@samsung.com>
- *
- * SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
+#include <init.h>
+#include <log.h>
+#include <malloc.h>
#include <pci.h>
#include <asm/arch/clock.h>
#include <asm/arch/iomux.h>
#include <asm/arch/crm_regs.h>
#include <asm/gpio.h>
#include <asm/io.h>
+#include <dm.h>
+#include <linux/delay.h>
#include <linux/sizes.h>
#include <errno.h>
#include <asm/arch/sys_proto.h>
/* PCIe Port Logic registers (memory-mapped) */
#define PL_OFFSET 0x700
+#define PCIE_PL_PFLR (PL_OFFSET + 0x08)
+#define PCIE_PL_PFLR_LINK_STATE_MASK (0x3f << 16)
+#define PCIE_PL_PFLR_FORCE_LINK (1 << 15)
#define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28)
#define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c)
#define PCIE_PHY_DEBUG_R1_LINK_UP (1 << 4)
#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
#define PCIE_ATU_UPPER_TARGET 0x91C
+struct imx_pcie_priv {
+ void __iomem *dbi_base;
+ void __iomem *cfg_base;
+};
+
/*
* PHY access functions
*/
return 0;
}
-static int imx6_pcie_link_up(void)
+static int imx6_pcie_link_up(struct imx_pcie_priv *priv)
{
u32 rc, ltssm;
int rx_valid, temp;
/* link is debug bit 36, debug register 1 starts at bit 32 */
- rc = readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R1);
+ rc = readl(priv->dbi_base + PCIE_PHY_DEBUG_R1);
if ((rc & PCIE_PHY_DEBUG_R1_LINK_UP) &&
!(rc & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING))
return -EAGAIN;
* && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition
* to gen2 is stuck
*/
- pcie_phy_read((void *)MX6_DBI_ADDR, PCIE_PHY_RX_ASIC_OUT, &rx_valid);
- ltssm = readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R0) & 0x3F;
+ pcie_phy_read(priv->dbi_base, PCIE_PHY_RX_ASIC_OUT, &rx_valid);
+ ltssm = readl(priv->dbi_base + PCIE_PHY_DEBUG_R0) & 0x3F;
if (rx_valid & 0x01)
return 0;
printf("transition to gen2 is stuck, reset PHY!\n");
- pcie_phy_read((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, &temp);
+ pcie_phy_read(priv->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((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, temp);
+ pcie_phy_write(priv->dbi_base, PHY_RX_OVRD_IN_LO, temp);
udelay(3000);
- pcie_phy_read((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, &temp);
+ pcie_phy_read(priv->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((void *)MX6_DBI_ADDR, PHY_RX_OVRD_IN_LO, temp);
+ pcie_phy_write(priv->dbi_base, PHY_RX_OVRD_IN_LO, temp);
return 0;
}
/*
* iATU region setup
*/
-static int imx_pcie_regions_setup(void)
+static int imx_pcie_regions_setup(struct imx_pcie_priv *priv)
{
/*
* i.MX6 defines 16MB in the AXI address map for PCIe.
*/
/* CMD reg:I/O space, MEM space, and Bus Master Enable */
- setbits_le32(MX6_DBI_ADDR | PCI_COMMAND,
+ setbits_le32(priv->dbi_base + PCI_COMMAND,
PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
/* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
- setbits_le32(MX6_DBI_ADDR + PCI_CLASS_REVISION,
+ setbits_le32(priv->dbi_base + PCI_CLASS_REVISION,
PCI_CLASS_BRIDGE_PCI << 16);
/* Region #0 is used for Outbound CFG space access. */
- writel(0, MX6_DBI_ADDR + PCIE_ATU_VIEWPORT);
+ writel(0, priv->dbi_base + PCIE_ATU_VIEWPORT);
- writel(MX6_ROOT_ADDR, MX6_DBI_ADDR + PCIE_ATU_LOWER_BASE);
- writel(0, MX6_DBI_ADDR + PCIE_ATU_UPPER_BASE);
- writel(MX6_ROOT_ADDR + MX6_ROOT_SIZE, MX6_DBI_ADDR + PCIE_ATU_LIMIT);
+ writel(lower_32_bits((uintptr_t)priv->cfg_base),
+ priv->dbi_base + PCIE_ATU_LOWER_BASE);
+ writel(upper_32_bits((uintptr_t)priv->cfg_base),
+ priv->dbi_base + PCIE_ATU_UPPER_BASE);
+ writel(lower_32_bits((uintptr_t)priv->cfg_base + MX6_ROOT_SIZE),
+ priv->dbi_base + PCIE_ATU_LIMIT);
- writel(0, MX6_DBI_ADDR + PCIE_ATU_LOWER_TARGET);
- writel(0, MX6_DBI_ADDR + PCIE_ATU_UPPER_TARGET);
- writel(PCIE_ATU_TYPE_CFG0, MX6_DBI_ADDR + PCIE_ATU_CR1);
- writel(PCIE_ATU_ENABLE, MX6_DBI_ADDR + PCIE_ATU_CR2);
+ writel(0, priv->dbi_base + PCIE_ATU_LOWER_TARGET);
+ writel(0, priv->dbi_base + PCIE_ATU_UPPER_TARGET);
+ writel(PCIE_ATU_TYPE_CFG0, priv->dbi_base + PCIE_ATU_CR1);
+ writel(PCIE_ATU_ENABLE, priv->dbi_base + PCIE_ATU_CR2);
return 0;
}
/*
* PCI Express accessors
*/
-static uint32_t get_bus_address(pci_dev_t d, int where)
+static void __iomem *get_bus_address(struct imx_pcie_priv *priv,
+ pci_dev_t d, int where)
{
- uint32_t va_address;
+ void __iomem *va_address;
/* Reconfigure Region #0 */
- writel(0, MX6_DBI_ADDR + PCIE_ATU_VIEWPORT);
+ writel(0, priv->dbi_base + PCIE_ATU_VIEWPORT);
if (PCI_BUS(d) < 2)
- writel(PCIE_ATU_TYPE_CFG0, MX6_DBI_ADDR + PCIE_ATU_CR1);
+ writel(PCIE_ATU_TYPE_CFG0, priv->dbi_base + PCIE_ATU_CR1);
else
- writel(PCIE_ATU_TYPE_CFG1, MX6_DBI_ADDR + PCIE_ATU_CR1);
+ writel(PCIE_ATU_TYPE_CFG1, priv->dbi_base + PCIE_ATU_CR1);
if (PCI_BUS(d) == 0) {
- va_address = MX6_DBI_ADDR;
+ va_address = priv->dbi_base;
} else {
- writel(d << 8, MX6_DBI_ADDR + PCIE_ATU_LOWER_TARGET);
- va_address = MX6_IO_ADDR + SZ_16M - SZ_1M;
+ writel(d << 8, priv->dbi_base + PCIE_ATU_LOWER_TARGET);
+ va_address = priv->cfg_base;
}
va_address += (where & ~0x3);
}
}
-static int imx_pcie_read_config(struct pci_controller *hose, pci_dev_t d,
- int where, u32 *val)
+static int imx_pcie_read_cfg(struct imx_pcie_priv *priv, pci_dev_t d,
+ int where, u32 *val)
{
- uint32_t va_address;
+ void __iomem *va_address;
int ret;
ret = imx_pcie_addr_valid(d);
if (ret) {
*val = 0xffffffff;
- return ret;
+ return 0;
}
- va_address = get_bus_address(d, where);
+ va_address = get_bus_address(priv, d, where);
/*
* Read the PCIe config space. We must replace the DABT handler
return 0;
}
-static int imx_pcie_write_config(struct pci_controller *hose, pci_dev_t d,
- int where, u32 val)
+static int imx_pcie_write_cfg(struct imx_pcie_priv *priv, pci_dev_t d,
+ int where, u32 val)
{
- uint32_t va_address = 0;
+ void __iomem *va_address = NULL;
int ret;
ret = imx_pcie_addr_valid(d);
if (ret)
return ret;
- va_address = get_bus_address(d, where);
+ va_address = get_bus_address(priv, d, where);
/*
* Write the PCIe config space. We must replace the DABT handler
/*
* Initial bus setup
*/
-static int imx6_pcie_assert_core_reset(void)
+static int imx6_pcie_assert_core_reset(struct imx_pcie_priv *priv,
+ bool prepare_for_boot)
{
struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
/* Power up PCIe PHY */
setbits_le32(&gpc_regs->cntr, PCIE_PHY_PUP_REQ);
#else
+ /*
+ * If the bootloader already enabled the link we need some special
+ * handling to get the core back into a state where it is safe to
+ * touch it for configuration. As there is no dedicated reset signal
+ * wired up for MX6QDL, we need to manually force LTSSM into "detect"
+ * state before completely disabling LTSSM, which is a prerequisite
+ * for core configuration.
+ *
+ * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
+ * indication that the bootloader activated the link.
+ */
+ if (is_mx6dq() && prepare_for_boot) {
+ u32 val, gpr1, gpr12;
+
+ gpr1 = readl(&iomuxc_regs->gpr[1]);
+ gpr12 = readl(&iomuxc_regs->gpr[12]);
+ if ((gpr1 & IOMUXC_GPR1_PCIE_REF_CLK_EN) &&
+ (gpr12 & IOMUXC_GPR12_PCIE_CTL_2)) {
+ val = readl(priv->dbi_base + PCIE_PL_PFLR);
+ val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
+ val |= PCIE_PL_PFLR_FORCE_LINK;
+
+ imx_pcie_fix_dabt_handler(true);
+ writel(val, priv->dbi_base + PCIE_PL_PFLR);
+ imx_pcie_fix_dabt_handler(false);
+
+ gpr12 &= ~IOMUXC_GPR12_PCIE_CTL_2;
+ writel(val, &iomuxc_regs->gpr[12]);
+ }
+ }
setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
#endif
__weak int imx6_pcie_toggle_power(void)
{
#ifdef CONFIG_PCIE_IMX_POWER_GPIO
+ gpio_request(CONFIG_PCIE_IMX_POWER_GPIO, "pcie_power");
gpio_direction_output(CONFIG_PCIE_IMX_POWER_GPIO, 0);
mdelay(20);
gpio_set_value(CONFIG_PCIE_IMX_POWER_GPIO, 1);
mdelay(20);
+ gpio_free(CONFIG_PCIE_IMX_POWER_GPIO);
#endif
return 0;
}
* state due to being previously used in U-Boot.
*/
#ifdef CONFIG_PCIE_IMX_PERST_GPIO
+ gpio_request(CONFIG_PCIE_IMX_PERST_GPIO, "pcie_reset");
gpio_direction_output(CONFIG_PCIE_IMX_PERST_GPIO, 0);
mdelay(20);
gpio_set_value(CONFIG_PCIE_IMX_PERST_GPIO, 1);
mdelay(20);
+ gpio_free(CONFIG_PCIE_IMX_PERST_GPIO);
#else
puts("WARNING: Make sure the PCIe #PERST line is connected!\n");
#endif
return 0;
}
-static int imx_pcie_link_up(void)
+static int imx_pcie_link_up(struct imx_pcie_priv *priv)
{
struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
uint32_t tmp;
int count = 0;
- imx6_pcie_assert_core_reset();
+ imx6_pcie_assert_core_reset(priv, false);
imx6_pcie_init_phy();
imx6_pcie_deassert_core_reset();
- imx_pcie_regions_setup();
+ imx_pcie_regions_setup(priv);
+
+ /*
+ * By default, the subordinate is set equally to the secondary
+ * bus (0x01) when the RC boots.
+ * This means that theoretically, only bus 1 is reachable from the RC.
+ * Force the PCIe RC subordinate to 0xff, otherwise no downstream
+ * devices will be detected if the enumeration is applied strictly.
+ */
+ tmp = readl(priv->dbi_base + 0x18);
+ tmp |= (0xff << 16);
+ writel(tmp, priv->dbi_base + 0x18);
/*
* FIXME: Force the PCIe RC to Gen1 operation
* up, otherwise no downstream devices are detected. After the
* link is up, a managed Gen1->Gen2 transition can be initiated.
*/
- tmp = readl(MX6_DBI_ADDR + 0x7c);
+ tmp = readl(priv->dbi_base + 0x7c);
tmp &= ~0xf;
tmp |= 0x1;
- writel(tmp, MX6_DBI_ADDR + 0x7c);
+ writel(tmp, priv->dbi_base + 0x7c);
/* LTSSM enable, starting link. */
setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_APPS_LTSSM_ENABLE);
- while (!imx6_pcie_link_up()) {
+ while (!imx6_pcie_link_up(priv)) {
udelay(10);
count++;
- if (count >= 2000) {
+ if (count >= 4000) {
#ifdef CONFIG_PCI_SCAN_SHOW
puts("PCI: pcie phy link never came up\n");
#endif
debug("DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
- readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R0),
- readl(MX6_DBI_ADDR + PCIE_PHY_DEBUG_R1));
+ readl(priv->dbi_base + PCIE_PHY_DEBUG_R0),
+ readl(priv->dbi_base + PCIE_PHY_DEBUG_R1));
return -EINVAL;
}
}
return 0;
}
+#if !CONFIG_IS_ENABLED(DM_PCI)
+static struct imx_pcie_priv imx_pcie_priv = {
+ .dbi_base = (void __iomem *)MX6_DBI_ADDR,
+ .cfg_base = (void __iomem *)MX6_ROOT_ADDR,
+};
+
+static struct imx_pcie_priv *priv = &imx_pcie_priv;
+
+static int imx_pcie_read_config(struct pci_controller *hose, pci_dev_t d,
+ int where, u32 *val)
+{
+ struct imx_pcie_priv *priv = hose->priv_data;
+
+ return imx_pcie_read_cfg(priv, d, where, val);
+}
+
+static int imx_pcie_write_config(struct pci_controller *hose, pci_dev_t d,
+ int where, u32 val)
+{
+ struct imx_pcie_priv *priv = hose->priv_data;
+
+ return imx_pcie_write_cfg(priv, d, where, val);
+}
+
void imx_pcie_init(void)
{
/* Static instance of the controller. */
memset(&pcc, 0, sizeof(pcc));
+ hose->priv_data = priv;
+
/* PCI I/O space */
pci_set_region(&hose->regions[0],
MX6_IO_ADDR, MX6_IO_ADDR,
imx_pcie_write_config);
/* Start the controller. */
- ret = imx_pcie_link_up();
+ ret = imx_pcie_link_up(priv);
if (!ret) {
pci_register_hose(hose);
}
}
+void imx_pcie_remove(void)
+{
+ imx6_pcie_assert_core_reset(priv, true);
+}
+
/* Probe function. */
void pci_init_board(void)
{
imx_pcie_init();
}
+#else
+static int imx_pcie_dm_read_config(const struct udevice *dev, pci_dev_t bdf,
+ uint offset, ulong *value,
+ enum pci_size_t size)
+{
+ struct imx_pcie_priv *priv = dev_get_priv(dev);
+ u32 tmpval;
+ int ret;
+
+ ret = imx_pcie_read_cfg(priv, bdf, offset, &tmpval);
+ if (ret)
+ return ret;
+
+ *value = pci_conv_32_to_size(tmpval, offset, size);
+ return 0;
+}
+
+static int imx_pcie_dm_write_config(struct udevice *dev, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct imx_pcie_priv *priv = dev_get_priv(dev);
+ u32 tmpval, newval;
+ int ret;
+
+ ret = imx_pcie_read_cfg(priv, bdf, offset, &tmpval);
+ if (ret)
+ return ret;
+
+ newval = pci_conv_size_to_32(tmpval, value, offset, size);
+ return imx_pcie_write_cfg(priv, bdf, offset, newval);
+}
+
+static int imx_pcie_dm_probe(struct udevice *dev)
+{
+ struct imx_pcie_priv *priv = dev_get_priv(dev);
+
+ return imx_pcie_link_up(priv);
+}
+
+static int imx_pcie_dm_remove(struct udevice *dev)
+{
+ struct imx_pcie_priv *priv = dev_get_priv(dev);
+
+ imx6_pcie_assert_core_reset(priv, true);
+
+ return 0;
+}
+
+static int imx_pcie_ofdata_to_platdata(struct udevice *dev)
+{
+ struct imx_pcie_priv *priv = dev_get_priv(dev);
+
+ priv->dbi_base = (void __iomem *)devfdt_get_addr_index(dev, 0);
+ priv->cfg_base = (void __iomem *)devfdt_get_addr_index(dev, 1);
+ if (!priv->dbi_base || !priv->cfg_base)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct dm_pci_ops imx_pcie_ops = {
+ .read_config = imx_pcie_dm_read_config,
+ .write_config = imx_pcie_dm_write_config,
+};
+
+static const struct udevice_id imx_pcie_ids[] = {
+ { .compatible = "fsl,imx6q-pcie" },
+ { .compatible = "fsl,imx6sx-pcie" },
+ { }
+};
+
+U_BOOT_DRIVER(imx_pcie) = {
+ .name = "imx_pcie",
+ .id = UCLASS_PCI,
+ .of_match = imx_pcie_ids,
+ .ops = &imx_pcie_ops,
+ .probe = imx_pcie_dm_probe,
+ .remove = imx_pcie_dm_remove,
+ .ofdata_to_platdata = imx_pcie_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct imx_pcie_priv),
+ .flags = DM_FLAG_OS_PREPARE,
+};
+#endif
projects / oweals / u-boot.git / blobdiff