diff options
Diffstat (limited to 'target/linux/ath79/patches-6.6/315-MIPS-pci-ar724x-add-QCA9550-reset-sequence.patch')
| -rw-r--r-- | target/linux/ath79/patches-6.6/315-MIPS-pci-ar724x-add-QCA9550-reset-sequence.patch | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-6.6/315-MIPS-pci-ar724x-add-QCA9550-reset-sequence.patch b/target/linux/ath79/patches-6.6/315-MIPS-pci-ar724x-add-QCA9550-reset-sequence.patch new file mode 100644 index 0000000000..375dec8ba2 --- /dev/null +++ b/target/linux/ath79/patches-6.6/315-MIPS-pci-ar724x-add-QCA9550-reset-sequence.patch @@ -0,0 +1,130 @@ +From: David Bauer <mail@david-bauer.net> +Date: Sat, 11 Apr 2020 14:03:12 +0200 +Subject: MIPS: pci-ar724x: add QCA9550 reset sequence + +The QCA9550 family of SoCs have a slightly different reset +sequence compared to older chips. + +Normally the bootloader performs this sequence, however +some bootloader implementation expect the operating system +to clear the reset. + +Also get the resets from OF to support handling of the second +PCIe root-complex on the QCA9558. + +Signed-off-by: David Bauer <mail@david-bauer.net> + +--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h ++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h +@@ -390,6 +390,7 @@ + #define QCA955X_PLL_CPU_CONFIG_REG 0x00 + #define QCA955X_PLL_DDR_CONFIG_REG 0x04 + #define QCA955X_PLL_CLK_CTRL_REG 0x08 ++#define QCA955X_PLL_PCIE_CONFIG_REG 0x0c + #define QCA955X_PLL_ETH_XMII_CONTROL_REG 0x28 + #define QCA955X_PLL_ETH_SGMII_CONTROL_REG 0x48 + #define QCA955X_PLL_ETH_SGMII_SERDES_REG 0x4c +@@ -475,6 +476,9 @@ + #define QCA956X_PLL_CLK_CTRL_CPU_DDRCLK_FROM_CPUPLL BIT(21) + #define QCA956X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL BIT(24) + ++#define QCA955X_PLL_PCIE_CONFIG_PLL_PWD BIT(30) ++#define QCA955X_PLL_PCIE_CONFIG_PLL_BYPASS BIT(16) ++ + #define QCA956X_PLL_SWITCH_CLOCK_SPARE_I2C_CLK_SELB BIT(5) + #define QCA956X_PLL_SWITCH_CLOCK_SPARE_MDIO_CLK_SEL0_1 BIT(6) + #define QCA956X_PLL_SWITCH_CLOCK_SPARE_UART1_CLK_SEL BIT(7) +--- a/arch/mips/pci/pci-ar724x.c ++++ b/arch/mips/pci/pci-ar724x.c +@@ -8,6 +8,7 @@ + + #include <linux/irq.h> + #include <linux/pci.h> ++#include <linux/reset.h> + #include <linux/init.h> + #include <linux/delay.h> + #include <linux/platform_device.h> +@@ -55,6 +56,9 @@ struct ar724x_pci_controller { + struct irq_domain *domain; + struct resource io_res; + struct resource mem_res; ++ ++ struct reset_control *hc_reset; ++ struct reset_control *phy_reset; + }; + + static struct irq_chip ar724x_pci_irq_chip; +@@ -340,18 +344,30 @@ static void ar724x_pci_hw_init(struct ar + int wait = 0; + + /* deassert PCIe host controller and PCIe PHY reset */ +- ath79_device_reset_clear(AR724X_RESET_PCIE); +- ath79_device_reset_clear(AR724X_RESET_PCIE_PHY); ++ reset_control_deassert(apc->hc_reset); ++ reset_control_deassert(apc->phy_reset); + +- /* remove the reset of the PCIE PLL */ +- ppl = ath79_pll_rr(AR724X_PLL_REG_PCIE_CONFIG); +- ppl &= ~AR724X_PLL_REG_PCIE_CONFIG_PPL_RESET; +- ath79_pll_wr(AR724X_PLL_REG_PCIE_CONFIG, ppl); +- +- /* deassert bypass for the PCIE PLL */ +- ppl = ath79_pll_rr(AR724X_PLL_REG_PCIE_CONFIG); +- ppl &= ~AR724X_PLL_REG_PCIE_CONFIG_PPL_BYPASS; +- ath79_pll_wr(AR724X_PLL_REG_PCIE_CONFIG, ppl); ++ if (of_device_is_compatible(apc->np, "qcom,qca9550-pci")) { ++ /* remove the reset of the PCIE PLL */ ++ ppl = ath79_pll_rr(QCA955X_PLL_PCIE_CONFIG_REG); ++ ppl &= ~QCA955X_PLL_PCIE_CONFIG_PLL_PWD; ++ ath79_pll_wr(QCA955X_PLL_PCIE_CONFIG_REG, ppl); ++ ++ /* deassert bypass for the PCIE PLL */ ++ ppl = ath79_pll_rr(QCA955X_PLL_PCIE_CONFIG_REG); ++ ppl &= ~QCA955X_PLL_PCIE_CONFIG_PLL_BYPASS; ++ ath79_pll_wr(QCA955X_PLL_PCIE_CONFIG_REG, ppl); ++ } else { ++ /* remove the reset of the PCIE PLL */ ++ ppl = ath79_pll_rr(AR724X_PLL_REG_PCIE_CONFIG); ++ ppl &= ~AR724X_PLL_REG_PCIE_CONFIG_PPL_RESET; ++ ath79_pll_wr(AR724X_PLL_REG_PCIE_CONFIG, ppl); ++ ++ /* deassert bypass for the PCIE PLL */ ++ ppl = ath79_pll_rr(AR724X_PLL_REG_PCIE_CONFIG); ++ ppl &= ~AR724X_PLL_REG_PCIE_CONFIG_PPL_BYPASS; ++ ath79_pll_wr(AR724X_PLL_REG_PCIE_CONFIG, ppl); ++ } + + /* set PCIE Application Control to ready */ + app = __raw_readl(apc->ctrl_base + AR724X_PCI_REG_APP); +@@ -395,6 +411,14 @@ static int ar724x_pci_probe(struct platf + if (apc->irq < 0) + return -EINVAL; + ++ apc->hc_reset = devm_reset_control_get_exclusive(&pdev->dev, "hc"); ++ if (IS_ERR(apc->hc_reset)) ++ return PTR_ERR(apc->hc_reset); ++ ++ apc->phy_reset = devm_reset_control_get_exclusive(&pdev->dev, "phy"); ++ if (IS_ERR(apc->phy_reset)) ++ return PTR_ERR(apc->phy_reset); ++ + apc->np = pdev->dev.of_node; + apc->pci_controller.pci_ops = &ar724x_pci_ops; + apc->pci_controller.io_resource = &apc->io_res; +@@ -405,7 +429,7 @@ static int ar724x_pci_probe(struct platf + * Do the full PCIE Root Complex Initialization Sequence if the PCIe + * host controller is in reset. + */ +- if (ath79_reset_rr(AR724X_RESET_REG_RESET_MODULE) & AR724X_RESET_PCIE) ++ if (reset_control_status(apc->hc_reset)) + ar724x_pci_hw_init(apc); + + apc->link_up = ar724x_pci_check_link(apc); +@@ -423,6 +447,7 @@ static int ar724x_pci_probe(struct platf + + static const struct of_device_id ar724x_pci_ids[] = { + { .compatible = "qcom,ar7240-pci" }, ++ { .compatible = "qcom,qca9550-pci" }, + {}, + }; + |