+++ /dev/null
-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
-@@ -394,6 +394,7 @@
- #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
-@@ -479,6 +480,9 @@
- #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
-@@ -11,6 +11,7 @@
-
- #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>
-@@ -58,6 +59,9 @@ 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;
-@@ -343,18 +347,30 @@ 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);
-@@ -402,6 +418,14 @@ 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;
-@@ -412,7 +436,7 @@ 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);
-@@ -430,6 +454,7 @@ static int ar724x_pci_probe(struct platf
-
- static const struct of_device_id ar724x_pci_ids[] = {
- { .compatible = "qcom,ar7240-pci" },
-+ { .compatible = "qcom,qca9550-pci" },
- {},
- };
-
projects / openwrt / openwrt.git / blobdiff