[PATCH] PCI: brcmstb: implement BCM4908 support
Rafał Miłecki
zajec5 at gmail.com
Mon Aug 16 05:50:29 PDT 2021
From: Rafał Miłecki <rafal at milecki.pl>
BCM4908 is Broadcom's 64-bit platform with Broadcom's own Brahma-B53
CPU(s). It uses the same PCIe hardware block as STB (Set-Top-Box) family
but in a slightly different revision & setup.
Registers in BCM4908 variant are mostly the same but controller setup
differs a bit. It requires setting few extra registers and takes
slightly different bars setup.
Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
drivers/pci/controller/pcie-brcmstb.c | 137 +++++++++++++++++++++++---
1 file changed, 123 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index cc30215f5a43..24bc7efcfdd5 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -51,15 +51,20 @@
#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
#define PCIE_MISC_MISC_CTRL 0x4008
+#define PCIE_MISC_MISC_CTRL_PCIE_RCB_64B_MODE 0x00000080
+#define PCIE_MISC_MISC_CTRL_PCIE_RCB_MPS_MODE 0x00000400
+#define PCIE_MISC_MISC_CTRL_PCIE_IN_WR_COMBINE 0x00000800
#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
+#define PCIE_MISC_MISC_CTRL_BURST_ALIGN_MASK 0x00080000
#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
#define PCIE_MISC_MISC_CTRL_SCB1_SIZE_MASK 0x07c00000
#define PCIE_MISC_MISC_CTRL_SCB2_SIZE_MASK 0x0000001f
#define SCB_SIZE_MASK(x) PCIE_MISC_MISC_CTRL_SCB ## x ## _SIZE_MASK
+
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
#define PCIE_MEM_WIN0_LO(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + ((win) * 8)
@@ -115,6 +120,9 @@
#define PCIE_MEM_WIN0_LIMIT_HI(win) \
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI + ((win) * 8)
+#define PCIE_MISC_UBUS_BAR1_CONFIG_REMAP_OFFSET 0x40ac
+#define PCIE_MISC_UBUS_BAR_CONFIG_ACCESS_EN 0x00000001
+
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
@@ -131,6 +139,13 @@
#define PCIE_EXT_CFG_DATA 0x8000
#define PCIE_EXT_CFG_INDEX 0x9000
+#define PCIE_CPU_INTR1_INTR_MASK_CLEAR_OFFSET 0x940c
+#define PCIE_CPU_INTR1_PCIE_INTA_CPU_INTR 0x00000002
+#define PCIE_CPU_INTR1_PCIE_INTB_CPU_INTR 0x00000004
+#define PCIE_CPU_INTR1_PCIE_INTC_CPU_INTR 0x00000008
+#define PCIE_CPU_INTR1_PCIE_INTD_CPU_INTR 0x00000010
+#define PCIE_CPU_INTR1_PCIE_INTR_CPU_INTR 0x00000020
+
#define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
#define PCIE_RGR1_SW_INIT_1_PERST_SHIFT 0x0
@@ -746,13 +761,19 @@ static inline void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32
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 (pcie->hw_rev >= BRCM_PCIE_HW_REV_3_20) {
+ brcm_pcie_perst_set_7278(pcie, val);
+ } else {
+ 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);
+ if (val)
+ reset_control_assert(pcie->perst_reset);
+ else
+ reset_control_deassert(pcie->perst_reset);
+ }
+
+ usleep_range(10000, 20000);
}
static inline void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val)
@@ -861,6 +882,86 @@ static inline int brcm_pcie_get_rc_bar2_size_and_offset(struct brcm_pcie *pcie,
return 0;
}
+static int brcm_pcie_setup_bcm4908(struct brcm_pcie *pcie)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
+ void __iomem *base = pcie->base;
+ struct device *dev = pcie->dev;
+ struct resource_entry *entry;
+ u32 burst_align;
+ u32 burst;
+ u32 tmp;
+ int win;
+
+ pcie->perst_set(pcie, 0);
+
+ msleep(500);
+
+ if (!brcm_pcie_link_up(pcie)) {
+ dev_err(dev, "link down\n");
+ return -ENODEV;
+ }
+
+ /* setup lgacy outband interrupts */
+ tmp = PCIE_CPU_INTR1_PCIE_INTA_CPU_INTR |
+ PCIE_CPU_INTR1_PCIE_INTB_CPU_INTR |
+ PCIE_CPU_INTR1_PCIE_INTC_CPU_INTR |
+ PCIE_CPU_INTR1_PCIE_INTD_CPU_INTR;
+ writel(tmp, base + PCIE_CPU_INTR1_INTR_MASK_CLEAR_OFFSET);
+
+ win = 0;
+ resource_list_for_each_entry(entry, &bridge->windows) {
+ struct resource *res = entry->res;
+ u64 pcie_addr;
+
+ if (resource_type(res) != IORESOURCE_MEM)
+ continue;
+
+ if (win >= BRCM_NUM_PCIE_OUT_WINS) {
+ dev_err(pcie->dev, "too many outbound wins\n");
+ return -EINVAL;
+ }
+
+ tmp = 0;
+ u32p_replace_bits(&tmp, res->start / SZ_1M,
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
+ u32p_replace_bits(&tmp, res->end / SZ_1M,
+ PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
+ writel(tmp, base + PCIE_MEM_WIN0_BASE_LIMIT(win));
+
+ pcie_addr = res->start - entry->offset;
+ writel(lower_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_LO(win));
+ writel(upper_32_bits(pcie_addr), pcie->base + PCIE_MEM_WIN0_HI(win));
+
+ win++;
+ }
+
+ writel(0xf, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
+
+ tmp = PCIE_MISC_UBUS_BAR_CONFIG_ACCESS_EN;
+ writel(tmp, base + PCIE_MISC_UBUS_BAR1_CONFIG_REMAP_OFFSET);
+
+ tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
+ u32p_replace_bits(&tmp, PCI_CLASS_BRIDGE_PCI << 8,
+ PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
+ writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
+
+ /* Burst */
+ burst = 0x1; /* 128 B */
+ burst_align = 1;
+
+ tmp = readl(base + PCIE_MISC_MISC_CTRL);
+ u32p_replace_bits(&tmp, burst_align, PCIE_MISC_MISC_CTRL_BURST_ALIGN_MASK);
+ u32p_replace_bits(&tmp, burst, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
+ u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
+ u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_PCIE_IN_WR_COMBINE);
+ u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_PCIE_RCB_MPS_MODE);
+ u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_PCIE_RCB_64B_MODE);
+ writel(tmp, base + PCIE_MISC_MISC_CTRL);
+
+ return 0;
+}
+
static int brcm_pcie_setup(struct brcm_pcie *pcie)
{
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
@@ -1284,6 +1385,13 @@ static int brcm_pcie_probe(struct platform_device *pdev)
return PTR_ERR(pcie->perst_reset);
}
+ if (pcie->type == BCM4908) {
+ /* On BCM4908 we can read rev early and perst_set needs it */
+ pcie->hw_rev = readl(pcie->base + PCIE_MISC_REVISION);
+
+ pcie->perst_set(pcie, 1);
+ }
+
ret = reset_control_reset(pcie->rescal);
if (ret)
dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
@@ -1295,16 +1403,17 @@ static int brcm_pcie_probe(struct platform_device *pdev)
return ret;
}
- ret = brcm_pcie_setup(pcie);
- if (ret)
- goto fail;
+ if (pcie->type == BCM4908) {
+ ret = brcm_pcie_setup_bcm4908(pcie);
+ if (ret)
+ goto fail;
+ } else {
+ ret = brcm_pcie_setup(pcie);
+ if (ret)
+ 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");
- ret = -ENODEV;
- goto fail;
- }
msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
if (pci_msi_enabled() && msi_np == pcie->np) {
--
2.26.2
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