From: Niklas Cassel <niklas.cassel@axis.com>
To: Niklas Cassel <niklass@axis.com>,
Jesper Nilsson <jespern@axis.com>,
Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-arm-kernel@axis.com, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 07/10] PCI: dwc: artpec6: split artpec6_pcie_establish_link to smaller functions
Date: Fri, 13 Oct 2017 18:09:10 +0200 [thread overview]
Message-ID: <20171013160914.3220-8-niklas.cassel@axis.com> (raw)
In-Reply-To: <20171013160914.3220-1-niklas.cassel@axis.com>
This is done to better match other drivers such as dra7xx and imx6,
but also to prepare for endpoint mode support.
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
---
drivers/pci/dwc/pcie-artpec6.c | 59 +++++++++++++++++++++++-------------------
1 file changed, 32 insertions(+), 27 deletions(-)
diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index 18075e0fab80..c5d7f98dc6b2 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -80,18 +80,11 @@ static u64 artpec6_pcie_cpu_addr_fixup(u64 pci_addr)
return pci_addr & ARTPEC6_CPU_TO_BUS_ADDR;
}
-static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
+static void artpec6_pcie_init_phy(struct artpec6_pcie *artpec6_pcie)
{
- struct dw_pcie *pci = artpec6_pcie->pci;
- struct pcie_port *pp = &pci->pp;
u32 val;
unsigned int retries;
- /* Hold DW core in reset */
- val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
- val |= PCIECFG_CORE_RESET_REQ;
- artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
-
val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
val |= PCIECFG_RISRCREN | /* Receiver term. 50 Ohm */
PCIECFG_MODE_TX_DRV_EN |
@@ -131,30 +124,18 @@ static int artpec6_pcie_establish_link(struct artpec6_pcie *artpec6_pcie)
val = readl(artpec6_pcie->phy_base + PHY_STATUS);
retries--;
} while (retries && !(val & PHY_COSPLLLOCK));
+}
- /* Take DW core out of reset */
- val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
- val &= ~PCIECFG_CORE_RESET_REQ;
- artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
- usleep_range(100, 200);
-
- /* setup root complex */
- dw_pcie_setup_rc(pp);
+static int artpec6_pcie_establish_link(struct dw_pcie *pci)
+{
+ struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
+ u32 val;
- /* assert LTSSM enable */
val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
val |= PCIECFG_LTSSM_ENABLE;
artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
- /* check if the link is up or not */
- if (!dw_pcie_wait_for_link(pci))
- return 0;
-
- dev_dbg(pci->dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
- dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R0),
- dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1));
-
- return -ETIMEDOUT;
+ return 0;
}
static void artpec6_pcie_enable_interrupts(struct artpec6_pcie *artpec6_pcie)
@@ -166,12 +147,36 @@ static void artpec6_pcie_enable_interrupts(struct artpec6_pcie *artpec6_pcie)
dw_pcie_msi_init(pp);
}
+static void artpec6_pcie_assert_core_reset(struct artpec6_pcie *artpec6_pcie)
+{
+ u32 val;
+
+ val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
+ val |= PCIECFG_CORE_RESET_REQ;
+ artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
+}
+
+static void artpec6_pcie_deassert_core_reset(struct artpec6_pcie *artpec6_pcie)
+{
+ u32 val;
+
+ val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
+ val &= ~PCIECFG_CORE_RESET_REQ;
+ artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
+ usleep_range(100, 200);
+}
+
static int artpec6_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
- artpec6_pcie_establish_link(artpec6_pcie);
+ artpec6_pcie_assert_core_reset(artpec6_pcie);
+ artpec6_pcie_init_phy(artpec6_pcie);
+ artpec6_pcie_deassert_core_reset(artpec6_pcie);
+ dw_pcie_setup_rc(pp);
+ artpec6_pcie_establish_link(pci);
+ dw_pcie_wait_for_link(pci);
artpec6_pcie_enable_interrupts(artpec6_pcie);
return 0;
--
2.11.0
next prev parent reply other threads:[~2017-10-13 16:09 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-13 16:09 [PATCH 00/10] dwc MSI fixes, ARTPEC-6 EP mode support, ARTPEC-7 SoC support Niklas Cassel
2017-10-13 16:09 ` [PATCH 01/10] PCI: dwc: use DMA-API for allocating MSI data Niklas Cassel
2017-10-13 16:42 ` David Laight
2017-10-16 11:43 ` Niklas Cassel
2017-10-13 16:43 ` Jingoo Han
2017-10-16 12:08 ` Niklas Cassel
2017-10-13 16:47 ` Jingoo Han
2017-10-16 12:11 ` Niklas Cassel
2017-10-16 22:16 ` Bjorn Helgaas
2017-10-13 16:09 ` [PATCH 02/10] PCI: designware-ep: set_msi should only set MMC bits Niklas Cassel
2017-10-16 22:26 ` Bjorn Helgaas
2017-10-13 16:09 ` [PATCH 03/10] PCI: designware-ep: read-only registers need DBI_RO_WR_EN to be writable Niklas Cassel
2017-10-13 16:09 ` [PATCH 04/10] PCI: designware-ep: pre-allocate memory for MSI in dw_pcie_ep_init Niklas Cassel
2017-10-13 16:09 ` [PATCH 05/10] PCI: artpec6: remove unused defines Niklas Cassel
2017-10-13 16:09 ` [PATCH 06/10] PCI: dwc: artpec6: use BIT and GENMASK macros Niklas Cassel
2017-10-13 16:09 ` Niklas Cassel [this message]
2017-10-13 16:09 ` [PATCH 08/10] PCI: dwc: artpec6: add support for endpoint mode Niklas Cassel
2017-10-16 23:43 ` Bjorn Helgaas
2017-10-18 8:03 ` Kishon Vijay Abraham I
2017-10-18 8:15 ` Niklas Cassel
2017-10-18 8:47 ` Kishon Vijay Abraham I
2017-10-19 7:59 ` Christoph Hellwig
2017-10-19 10:57 ` Niklas Cassel
2017-10-19 11:40 ` Niklas Cassel
2017-10-17 22:24 ` Rob Herring
2017-10-18 8:46 ` Kishon Vijay Abraham I
2017-10-20 10:48 ` Niklas Cassel
2017-10-13 16:09 ` [PATCH 09/10] PCI: dwc: make cpu_addr_fixup take struct dw_pcie as argument Niklas Cassel
2017-10-16 12:40 ` Niklas Cassel
2017-10-13 16:09 ` [PATCH 10/10] PCI: dwc: artpec6: add support for the ARTPEC-7 SoC Niklas Cassel
2017-10-17 22:25 ` Rob Herring
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