Commit 0cdfaceb authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Lorenzo Pieralisi
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PCI: brcmstb: support BCM4908 with external PERST# signal controller 

BCM4908 uses external MISC block for controlling PERST# signal. Use it
as a reset controller.

Link: https://lore.kernel.org/r/20201210180421.7230-3-zajec5@gmail.com


Signed-off-by: default avatarRafał Miłecki <rafal@milecki.pl>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent f435ce7e

drivers/pci/controller/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -273,7 +273,7 @@ config VMD 


config PCIE_BRCMSTB

	tristate "Broadcom Brcmstb PCIe host controller"

	depends on ARCH_BRCMSTB || ARCH_BCM2835 || COMPILE_TEST

	depends on ARCH_BRCMSTB || ARCH_BCM2835 || ARCH_BCM4908 || COMPILE_TEST

	depends on OF

	depends on PCI_MSI_IRQ_DOMAIN

	default ARCH_BRCMSTB

drivers/pci/controller/pcie-brcmstb.c

+32 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ 


#define PCIE_MISC_REVISION				0x406c

#define  BRCM_PCIE_HW_REV_33				0x0303

#define  BRCM_PCIE_HW_REV_3_20				0x0320



#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT		0x4070

#define  PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK	0xfff00000
@@ -187,6 +188,7 @@ 
struct brcm_pcie;

static inline void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val);

static inline void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val);

static inline void brcm_pcie_perst_set_4908(struct brcm_pcie *pcie, u32 val);

static inline void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val);

static inline void brcm_pcie_perst_set_generic(struct brcm_pcie *pcie, u32 val);
@@ -203,6 +205,7 @@ enum { 


enum pcie_type {

	GENERIC,

	BCM4908,

	BCM7278,

	BCM2711,

};
@@ -227,6 +230,13 @@ static const struct pcie_cfg_data generic_cfg = { 
	.bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,

};



static const struct pcie_cfg_data bcm4908_cfg = {

	.offsets	= pcie_offsets,

	.type		= BCM4908,

	.perst_set	= brcm_pcie_perst_set_4908,

	.bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,

};



static const int pcie_offset_bcm7278[] = {

	[RGR1_SW_INIT_1] = 0xc010,

	[EXT_CFG_INDEX] = 0x9000,
@@ -279,6 +289,7 @@ struct brcm_pcie { 
	const int		*reg_offsets;

	enum pcie_type		type;

	struct reset_control	*rescal;

	struct reset_control	*perst_reset;

	int			num_memc;

	u64			memc_size[PCIE_BRCM_MAX_MEMC];

	u32			hw_rev;
@@ -735,6 +746,17 @@ static inline void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 
	writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));

}



static inline void brcm_pcie_perst_set_4908(struct brcm_pcie *pcie, u32 val)

{

	if (WARN_ONCE(!pcie->perst_reset, "missing PERST# reset controller\n"))

		return;



	if (val)

		reset_control_assert(pcie->perst_reset);

	else

		reset_control_deassert(pcie->perst_reset);

}



static inline void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val)

{

	u32 tmp;
@@ -1194,6 +1216,7 @@ static int brcm_pcie_remove(struct platform_device *pdev) 


static const struct of_device_id brcm_pcie_match[] = {

	{ .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },

	{ .compatible = "brcm,bcm4908-pcie", .data = &bcm4908_cfg },

	{ .compatible = "brcm,bcm7211-pcie", .data = &generic_cfg },

	{ .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },

	{ .compatible = "brcm,bcm7216-pcie", .data = &bcm7278_cfg },
@@ -1250,6 +1273,11 @@ static int brcm_pcie_probe(struct platform_device *pdev) 
		clk_disable_unprepare(pcie->clk);

		return PTR_ERR(pcie->rescal);

	}

	pcie->perst_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "perst");

	if (IS_ERR(pcie->perst_reset)) {

		clk_disable_unprepare(pcie->clk);

		return PTR_ERR(pcie->perst_reset);

	}



	ret = reset_control_deassert(pcie->rescal);

	if (ret)
@@ -1267,6 +1295,10 @@ static int brcm_pcie_probe(struct platform_device *pdev) 
		goto fail;



	pcie->hw_rev = readl(pcie->base + PCIE_MISC_REVISION);

	if (pcie->type == BCM4908 && pcie->hw_rev >= BRCM_PCIE_HW_REV_3_20) {

		dev_err(pcie->dev, "hardware revision with unsupported PERST# setup\n");

		goto fail;

	}



	msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);

	if (pci_msi_enabled() && msi_np == pcie->np) {