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PCI: mediatek: Add a structure to abstract the controller generations

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Introduce a structure "mtk_pcie_soc" to abstract the differences between
controller generations, and the .startup() hook is used to encapsulate some
SoC-dependent related setting.  In doing so, the common code which will be
reused by future chips.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Honghui Zhang 2017-08-10 14:34:56 +08:00 committed by Bjorn Helgaas
parent 4f6f046044
commit c681c93067
1 changed files with 26 additions and 5 deletions
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31
drivers/pci/host/pcie-mediatek.c
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@ -64,6 +64,18 @@
#define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
#define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
struct mtk_pcie_port;
/**
* struct mtk_pcie_soc - differentiate between host generations
* @ops: pointer to configuration access functions
* @startup: pointer to controller setting functions
*/
struct mtk_pcie_soc {
struct pci_ops *ops;
int (*startup)(struct mtk_pcie_port *port);
};
/**
* struct mtk_pcie_port - PCIe port information
* @base: IO mapped register base
@ -97,6 +109,7 @@ struct mtk_pcie_port {
* @busn: bus range
* @offset: IO / Memory offset
* @ports: pointer to PCIe port information
* @soc: pointer to SoC-dependent operations
*/
struct mtk_pcie {
struct device *dev;
@ -112,6 +125,7 @@ struct mtk_pcie {
resource_size_t io;
} offset;
struct list_head ports;
const struct mtk_pcie_soc *soc;
};
static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
@ -229,7 +243,8 @@ static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
{
struct device *dev = port->pcie->dev;
struct mtk_pcie *pcie = port->pcie;
struct device *dev = pcie->dev;
int err;
err = clk_prepare_enable(port->sys_ck);
@ -247,7 +262,7 @@ static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
goto err_phy_on;
}
if (!mtk_pcie_startup_port(port))
if (!pcie->soc->startup(port))
return;
dev_info(dev, "Port%d link down\n", port->slot);
@ -472,7 +487,7 @@ static int mtk_pcie_register_host(struct pci_host_bridge *host)
host->busnr = pcie->busn.start;
host->dev.parent = pcie->dev;
host->ops = &mtk_pcie_ops;
host->ops = pcie->soc->ops;
host->map_irq = of_irq_parse_and_map_pci;
host->swizzle_irq = pci_common_swizzle;
@ -505,6 +520,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
pcie = pci_host_bridge_priv(host);
pcie->dev = dev;
pcie->soc = of_device_get_match_data(dev);
platform_set_drvdata(pdev, pcie);
INIT_LIST_HEAD(&pcie->ports);
@ -529,9 +545,14 @@ put_resources:
return err;
}
static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
.ops = &mtk_pcie_ops,
.startup = mtk_pcie_startup_port,
};
static const struct of_device_id mtk_pcie_ids[] = {
{ .compatible = "mediatek,mt7623-pcie"},
{ .compatible = "mediatek,mt2701-pcie"},
{ .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
{ .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
{},
};