| Message ID | e17461407cf4bb79fed5925ec81196a0b84e7827.1620203062.git.baruch@tkos.co.il (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | arm64: IPQ6018 PCIe support | expand |
On Wed, May 5, 2021 at 3:18 AM Baruch Siach <baruch@tkos.co.il> wrote: > > From: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> > > IPQ60xx series of SoCs have one port of PCIe gen 3. Add support for that > platform. > > The code is based on downstream Codeaurora kernel v5.4. Split out the > DBI registers access part from .init into .post_init. DBI registers are > only accessible after phy_power_on(). > > Signed-off-by: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> > Signed-off-by: Baruch Siach <baruch@tkos.co.il> > --- > v2: > * Drop ATU configuration; rely on common code instead > > * Use more common register macros > > * Use bulk clk and reset APIs > --- > drivers/pci/controller/dwc/pcie-designware.h | 1 + > drivers/pci/controller/dwc/pcie-qcom.c | 150 +++++++++++++++++++ > 2 files changed, 151 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index ceb359b6e6a6..346462c74a3e 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -76,6 +76,7 @@ > > #define GEN3_RELATED_OFF 0x890 > #define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0) > +#define GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS BIT(13) > #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) > #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 > #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > index 8a7a300163e5..93766aee3e7c 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom.c > +++ b/drivers/pci/controller/dwc/pcie-qcom.c > @@ -52,6 +52,10 @@ > #define PCIE20_PARF_DBI_BASE_ADDR 0x168 > #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C > #define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174 > +#define AHB_CLK_EN BIT(0) > +#define MSTR_AXI_CLK_EN BIT(1) > +#define BYPASS BIT(4) > + > #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178 > #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8 > #define PCIE20_PARF_LTSSM 0x1B0 > @@ -94,6 +98,12 @@ > #define SLV_ADDR_SPACE_SZ 0x10000000 > > #define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0 > +#define PCIE_CAP_CURR_DEEMPHASIS BIT(16) Isn't this a standard register field? > +#define SPEED_GEN1 0x1 > +#define SPEED_GEN2 0x2 > +#define SPEED_GEN3 0x3 And these? There's already some common DWC code for setting the link speed. > +#define AXI_CLK_RATE 200000000 > +#define RCHNG_CLK_RATE 100000000 > > #define DEVICE_TYPE_RC 0x4 > > @@ -168,6 +178,11 @@ struct qcom_pcie_resources_2_7_0 { > struct clk *pipe_clk; > }; > > +struct qcom_pcie_resources_2_9_0 { > + struct clk_bulk_data clks[5]; > + struct reset_control *rst; > +}; > + > union qcom_pcie_resources { > struct qcom_pcie_resources_1_0_0 v1_0_0; > struct qcom_pcie_resources_2_1_0 v2_1_0; > @@ -175,6 +190,7 @@ union qcom_pcie_resources { > struct qcom_pcie_resources_2_3_3 v2_3_3; > struct qcom_pcie_resources_2_4_0 v2_4_0; > struct qcom_pcie_resources_2_7_0 v2_7_0; > + struct qcom_pcie_resources_2_9_0 v2_9_0; > }; > > struct qcom_pcie; > @@ -1266,6 +1282,130 @@ static void qcom_pcie_post_deinit_2_7_0(struct qcom_pcie *pcie) > clk_disable_unprepare(res->pipe_clk); > } > > +static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie) > +{ > + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; > + struct dw_pcie *pci = pcie->pci; > + struct device *dev = pci->dev; > + int ret; > + > + res->clks[0].id = "iface"; > + res->clks[1].id = "axi_m"; > + res->clks[2].id = "axi_s"; > + res->clks[3].id = "axi_bridge"; > + res->clks[4].id = "rchng"; > + > + ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks); > + if (ret < 0) > + return ret; > + > + res->rst = devm_reset_control_array_get_exclusive(dev); > + if (IS_ERR(res->rst)) > + return PTR_ERR(res->rst); > + > + return 0; > +} > + > +static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie) > +{ > + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; > + > + clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks); > +} > + > +static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie) > +{ > + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; > + struct device *dev = pcie->pci->dev; > + int ret; > + > + ret = reset_control_assert(res->rst); > + if (ret) { > + dev_err(dev, "reset assert failed (%d)\n", ret); > + return ret; > + } > + > + usleep_range(2000, 2500); > + > + ret = reset_control_deassert(res->rst); > + if (ret) { > + dev_err(dev, "reset deassert failed (%d)\n", ret); > + return ret; > + } > + > + /* > + * Don't have a way to see if the reset has completed. > + * Wait for some time. > + */ > + usleep_range(2000, 2500); > + > + ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks); > + if (ret) > + goto err_reset; > + > + return 0; > + > + /* > + * Not checking for failure, will anyway return > + * the original failure in 'ret'. > + */ > +err_reset: > + reset_control_assert(res->rst); > + > + return ret; > +} > + > +static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie) > +{ > + struct dw_pcie *pci = pcie->pci; > + u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); > + u32 val; > + int i; > + > + writel(SLV_ADDR_SPACE_SZ, > + pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE); > + > + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); > + val &= ~BIT(0); > + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); > + > + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); > + > + writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE); > + writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN, > + pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); > + writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS > + | GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL, > + pci->dbi_base + GEN3_RELATED_OFF); > + > + writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS > + | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS | > + AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS, > + pcie->parf + PCIE20_PARF_SYS_CTRL); > + > + writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH); > + > + dw_pcie_dbi_ro_wr_en(pci); > + writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP); > + > + /* Configure PCIe link capabilities for ASPM */ > + val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP); > + val &= ~PCI_EXP_LNKCAP_ASPMS; > + writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP); > + > + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + > + PCI_EXP_DEVCTL2); > + > + writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3, > + pci->dbi_base + offset + PCI_EXP_DEVCTL2); Doesn't this overwrite the prior register write? > + > + for (i = 0;i < 256;i++) > + writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N > + + (4 * i)); > + > + return 0; > +} > + > static int qcom_pcie_link_up(struct dw_pcie *pci) > { > u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); > @@ -1456,6 +1596,15 @@ static const struct qcom_pcie_ops ops_1_9_0 = { > .config_sid = qcom_pcie_config_sid_sm8250, > }; > > +/* Qcom IP rev.: 2.9.0 Synopsys IP rev.: 5.00a */ > +static const struct qcom_pcie_ops ops_2_9_0 = { > + .get_resources = qcom_pcie_get_resources_2_9_0, > + .init = qcom_pcie_init_2_9_0, > + .post_init = qcom_pcie_post_init_2_9_0, > + .deinit = qcom_pcie_deinit_2_9_0, > + .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, > +}; > + > static const struct dw_pcie_ops dw_pcie_ops = { > .link_up = qcom_pcie_link_up, > .start_link = qcom_pcie_start_link, > @@ -1555,6 +1704,7 @@ static const struct of_device_id qcom_pcie_match[] = { > { .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 }, > { .compatible = "qcom,pcie-sdm845", .data = &ops_2_7_0 }, > { .compatible = "qcom,pcie-sm8250", .data = &ops_1_9_0 }, > + { .compatible = "qcom,pcie-ipq6018", .data = &ops_2_9_0 }, > { } > }; > > -- > 2.30.2 >
Hi Rob, On Fri, Aug 06 2021, Rob Herring wrote: > On Wed, May 5, 2021 at 3:18 AM Baruch Siach <baruch@tkos.co.il> wrote: >> >> From: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> >> >> IPQ60xx series of SoCs have one port of PCIe gen 3. Add support for that >> platform. >> >> The code is based on downstream Codeaurora kernel v5.4. Split out the >> DBI registers access part from .init into .post_init. DBI registers are >> only accessible after phy_power_on(). >> >> Signed-off-by: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> >> Signed-off-by: Baruch Siach <baruch@tkos.co.il> >> --- >> v2: >> * Drop ATU configuration; rely on common code instead >> >> * Use more common register macros >> >> * Use bulk clk and reset APIs >> --- >> drivers/pci/controller/dwc/pcie-designware.h | 1 + >> drivers/pci/controller/dwc/pcie-qcom.c | 150 +++++++++++++++++++ >> 2 files changed, 151 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h >> index ceb359b6e6a6..346462c74a3e 100644 >> --- a/drivers/pci/controller/dwc/pcie-designware.h >> +++ b/drivers/pci/controller/dwc/pcie-designware.h >> @@ -76,6 +76,7 @@ >> >> #define GEN3_RELATED_OFF 0x890 >> #define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0) >> +#define GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS BIT(13) >> #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) >> #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 >> #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) >> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c >> index 8a7a300163e5..93766aee3e7c 100644 >> --- a/drivers/pci/controller/dwc/pcie-qcom.c >> +++ b/drivers/pci/controller/dwc/pcie-qcom.c >> @@ -52,6 +52,10 @@ >> #define PCIE20_PARF_DBI_BASE_ADDR 0x168 >> #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C >> #define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174 >> +#define AHB_CLK_EN BIT(0) >> +#define MSTR_AXI_CLK_EN BIT(1) >> +#define BYPASS BIT(4) >> + >> #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178 >> #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8 >> #define PCIE20_PARF_LTSSM 0x1B0 >> @@ -94,6 +98,12 @@ >> #define SLV_ADDR_SPACE_SZ 0x10000000 >> >> #define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0 >> +#define PCIE_CAP_CURR_DEEMPHASIS BIT(16) > > Isn't this a standard register field? I don't know. I could not find any reference to this field or the registers it's part of. n >> +#define SPEED_GEN1 0x1 >> +#define SPEED_GEN2 0x2 >> +#define SPEED_GEN3 0x3 > > And these? > > There's already some common DWC code for setting the link speed. dw_pcie_link_set_max_speed() deals with other registers, as far as I can see. >> +#define AXI_CLK_RATE 200000000 >> +#define RCHNG_CLK_RATE 100000000 >> >> #define DEVICE_TYPE_RC 0x4 [snip] >> +static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie) >> +{ >> + struct dw_pcie *pci = pcie->pci; >> + u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); >> + u32 val; >> + int i; >> + >> + writel(SLV_ADDR_SPACE_SZ, >> + pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE); >> + >> + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); >> + val &= ~BIT(0); >> + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); >> + >> + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); >> + >> + writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE); >> + writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN, >> + pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); >> + writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS >> + | GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL, >> + pci->dbi_base + GEN3_RELATED_OFF); >> + >> + writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS >> + | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS | >> + AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS, >> + pcie->parf + PCIE20_PARF_SYS_CTRL); >> + >> + writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH); >> + >> + dw_pcie_dbi_ro_wr_en(pci); >> + writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP); >> + >> + /* Configure PCIe link capabilities for ASPM */ >> + val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP); >> + val &= ~PCI_EXP_LNKCAP_ASPMS; >> + writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP); >> + >> + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + >> + PCI_EXP_DEVCTL2); >> + >> + writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3, >> + pci->dbi_base + offset + PCI_EXP_DEVCTL2); > > Doesn't this overwrite the prior register write? It does. There are two mistakes here. The writel() above should set PCIE20_DEVICE_CONTROL2_STATUS2 (offset 0x98). This writel() should set PCIE20_LNK_CONTROL2_LINK_STATUS2 (offset 0xa0). So both are wrong. >> + >> + for (i = 0;i < 256;i++) >> + writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N >> + + (4 * i)); >> + >> + return 0; >> +} Thanks, baruch
On Wed, Aug 25, 2021 at 6:25 AM Baruch Siach <baruch@tkos.co.il> wrote: > > Hi Rob, > > On Fri, Aug 06 2021, Rob Herring wrote: > > On Wed, May 5, 2021 at 3:18 AM Baruch Siach <baruch@tkos.co.il> wrote: > >> > >> From: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> > >> > >> IPQ60xx series of SoCs have one port of PCIe gen 3. Add support for that > >> platform. > >> > >> The code is based on downstream Codeaurora kernel v5.4. Split out the > >> DBI registers access part from .init into .post_init. DBI registers are > >> only accessible after phy_power_on(). > >> > >> Signed-off-by: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> > >> Signed-off-by: Baruch Siach <baruch@tkos.co.il> > >> --- > >> v2: > >> * Drop ATU configuration; rely on common code instead > >> > >> * Use more common register macros > >> > >> * Use bulk clk and reset APIs > >> --- > >> drivers/pci/controller/dwc/pcie-designware.h | 1 + > >> drivers/pci/controller/dwc/pcie-qcom.c | 150 +++++++++++++++++++ > >> 2 files changed, 151 insertions(+) > >> > >> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > >> index ceb359b6e6a6..346462c74a3e 100644 > >> --- a/drivers/pci/controller/dwc/pcie-designware.h > >> +++ b/drivers/pci/controller/dwc/pcie-designware.h > >> @@ -76,6 +76,7 @@ > >> > >> #define GEN3_RELATED_OFF 0x890 > >> #define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0) > >> +#define GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS BIT(13) > >> #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) > >> #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 > >> #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) > >> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > >> index 8a7a300163e5..93766aee3e7c 100644 > >> --- a/drivers/pci/controller/dwc/pcie-qcom.c > >> +++ b/drivers/pci/controller/dwc/pcie-qcom.c > >> @@ -52,6 +52,10 @@ > >> #define PCIE20_PARF_DBI_BASE_ADDR 0x168 > >> #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C > >> #define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174 > >> +#define AHB_CLK_EN BIT(0) > >> +#define MSTR_AXI_CLK_EN BIT(1) > >> +#define BYPASS BIT(4) > >> + > >> #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178 > >> #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8 > >> #define PCIE20_PARF_LTSSM 0x1B0 > >> @@ -94,6 +98,12 @@ > >> #define SLV_ADDR_SPACE_SZ 0x10000000 > >> > >> #define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0 > >> +#define PCIE_CAP_CURR_DEEMPHASIS BIT(16) > > > > Isn't this a standard register field? > > I don't know. I could not find any reference to this field or the > registers it's part of. It is. I found it in the spec. But it's not in pci_reg.h and it is a read-only status bit (though some in DWC can be written). > n > >> +#define SPEED_GEN1 0x1 > >> +#define SPEED_GEN2 0x2 > >> +#define SPEED_GEN3 0x3 > > > > And these? #define PCI_EXP_LNKCTL2 48 /* Link Control 2 */ #define PCI_EXP_LNKCTL2_TLS 0x000f #define PCI_EXP_LNKCTL2_TLS_2_5GT 0x0001 /* Supported Speed 2.5GT/s */ #define PCI_EXP_LNKCTL2_TLS_5_0GT 0x0002 /* Supported Speed 5GT/s */ #define PCI_EXP_LNKCTL2_TLS_8_0GT 0x0003 /* Supported Speed 8GT/s */ #define PCI_EXP_LNKCTL2_TLS_16_0GT 0x0004 /* Supported Speed 16GT/s */ #define PCI_EXP_LNKCTL2_TLS_32_0GT 0x0005 /* Supported Speed 32GT/s */ #define PCI_EXP_LNKCTL2_TLS_64_0GT 0x0006 /* Supported Speed 64GT/s */ #define PCI_EXP_LNKCTL2_ENTER_COMP 0x0010 /* Enter Compliance */ #define PCI_EXP_LNKCTL2_TX_MARGIN 0x0380 /* Transmit Margin */ #define PCI_EXP_LNKCTL2_HASD 0x0020 /* HW Autonomous Speed Disable */ #define PCI_EXP_LNKSTA2 50 /* Link Status 2 */ > > > > There's already some common DWC code for setting the link speed. > > dw_pcie_link_set_max_speed() deals with other registers, as far as I can > see. Link Control2 which is what the above function configures appears to be the same register to me. Your definition is combining 2 registers. > > >> +#define AXI_CLK_RATE 200000000 > >> +#define RCHNG_CLK_RATE 100000000 > >> > >> #define DEVICE_TYPE_RC 0x4 > > [snip] > > >> +static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie) > >> +{ > >> + struct dw_pcie *pci = pcie->pci; > >> + u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); > >> + u32 val; > >> + int i; > >> + > >> + writel(SLV_ADDR_SPACE_SZ, > >> + pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE); > >> + > >> + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); > >> + val &= ~BIT(0); > >> + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); > >> + > >> + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); > >> + > >> + writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE); > >> + writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN, > >> + pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); > >> + writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS > >> + | GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL, > >> + pci->dbi_base + GEN3_RELATED_OFF); > >> + > >> + writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS > >> + | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS | > >> + AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS, > >> + pcie->parf + PCIE20_PARF_SYS_CTRL); > >> + > >> + writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH); > >> + > >> + dw_pcie_dbi_ro_wr_en(pci); > >> + writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP); > >> + > >> + /* Configure PCIe link capabilities for ASPM */ > >> + val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP); > >> + val &= ~PCI_EXP_LNKCAP_ASPMS; > >> + writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP); > >> + > >> + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + > >> + PCI_EXP_DEVCTL2); > >> + > >> + writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3, > >> + pci->dbi_base + offset + PCI_EXP_DEVCTL2); > > > > Doesn't this overwrite the prior register write? > > It does. There are two mistakes here. The writel() above should set > PCIE20_DEVICE_CONTROL2_STATUS2 (offset 0x98). No. Did you check what 'offset' is? PCIE20_DEVICE_CONTROL2_STATUS2 is PCI_EXP_DEVCTL2 plus the status reg. What's wrong is it should be a 16-bit write. > This writel() should set > PCIE20_LNK_CONTROL2_LINK_STATUS2 (offset 0xa0). So both are wrong. > > >> + > >> + for (i = 0;i < 256;i++) > >> + writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N > >> + + (4 * i)); > >> + > >> + return 0; > >> +} > > Thanks, > baruch > > -- > ~. .~ Tk Open Systems > =}------------------------------------------------ooO--U--Ooo------------{= > - baruch@tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -
Hi Rob, On Wed, Aug 25 2021, Rob Herring wrote: > On Wed, Aug 25, 2021 at 6:25 AM Baruch Siach <baruch@tkos.co.il> wrote: >> On Fri, Aug 06 2021, Rob Herring wrote: >> > On Wed, May 5, 2021 at 3:18 AM Baruch Siach <baruch@tkos.co.il> wrote: >> >> + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + >> >> + PCI_EXP_DEVCTL2); >> >> + >> >> + writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3, >> >> + pci->dbi_base + offset + PCI_EXP_DEVCTL2); >> > >> > Doesn't this overwrite the prior register write? >> >> It does. There are two mistakes here. The writel() above should set >> PCIE20_DEVICE_CONTROL2_STATUS2 (offset 0x98). > > No. Did you check what 'offset' is? PCIE20_DEVICE_CONTROL2_STATUS2 is > PCI_EXP_DEVCTL2 plus the status reg. What's wrong is it should be a > 16-bit write. Thanks for enlightening me. 'offset' is 0x70 here. So PCI_EXP_DEVCTL2 is at 0x98, and PCI_EXP_LNKCTL2 is at 0xa0. Only the second writel() is wrong. But since generic code handles speed, I can drop it entirely. I see that dw_pcie_link_set_max_speed() uses dw_pcie_writel_dbi() to write to PCI_EXP_LNKCTL2. Is that 16-bit write? Why are pci_regs.h register offsets in decimal? >> This writel() should set >> PCIE20_LNK_CONTROL2_LINK_STATUS2 (offset 0xa0). So both are wrong. Thanks, baruch
On Wed, Aug 25, 2021 at 9:23 AM Baruch Siach <baruch@tkos.co.il> wrote: > > Hi Rob, > > On Wed, Aug 25 2021, Rob Herring wrote: > > On Wed, Aug 25, 2021 at 6:25 AM Baruch Siach <baruch@tkos.co.il> wrote: > >> On Fri, Aug 06 2021, Rob Herring wrote: > >> > On Wed, May 5, 2021 at 3:18 AM Baruch Siach <baruch@tkos.co.il> wrote: > >> >> + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + > >> >> + PCI_EXP_DEVCTL2); > >> >> + > >> >> + writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3, > >> >> + pci->dbi_base + offset + PCI_EXP_DEVCTL2); > >> > > >> > Doesn't this overwrite the prior register write? > >> > >> It does. There are two mistakes here. The writel() above should set > >> PCIE20_DEVICE_CONTROL2_STATUS2 (offset 0x98). > > > > No. Did you check what 'offset' is? PCIE20_DEVICE_CONTROL2_STATUS2 is > > PCI_EXP_DEVCTL2 plus the status reg. What's wrong is it should be a > > 16-bit write. > > Thanks for enlightening me. 'offset' is 0x70 here. So PCI_EXP_DEVCTL2 is > at 0x98, and PCI_EXP_LNKCTL2 is at 0xa0. Only the second writel() is > wrong. But since generic code handles speed, I can drop it entirely. > > I see that dw_pcie_link_set_max_speed() uses dw_pcie_writel_dbi() to > write to PCI_EXP_LNKCTL2. Is that 16-bit write? No, that may be because some platforms can only do 32-bit accesses and dw_pcie_writew_dbi would be a RMW in that case. Or maybe there's some reliance on clearing the status register. > Why are pci_regs.h register offsets in decimal? No idea... Rob
On Wed, Aug 25, 2021 at 10:03:51AM -0500, Rob Herring wrote: > On Wed, Aug 25, 2021 at 9:23 AM Baruch Siach <baruch@tkos.co.il> wrote: > > Why are pci_regs.h register offsets in decimal? > > No idea... That does seem confusing and error prone. I'd merge a patch that made them hex to match the spec.
In subject: s/add support/Add support/ to match previous history. On Wed, May 05, 2021 at 12:18:30PM +0300, Baruch Siach wrote: > From: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org> > > IPQ60xx series of SoCs have one port of PCIe gen 3. Add support for that > platform. > > The code is based on downstream Codeaurora kernel v5.4. Split out the > DBI registers access part from .init into .post_init. DBI registers are > only accessible after phy_power_on(). The "downstream Codeaurora kernel v5.4" reference would be more useful if there were a URL reference to that driver. > +#define AXI_CLK_RATE 200000000 > +#define RCHNG_CLK_RATE 100000000 These are unused. > + for (i = 0;i < 256;i++) Add spaces after semicolons.
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index ceb359b6e6a6..346462c74a3e 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -76,6 +76,7 @@ #define GEN3_RELATED_OFF 0x890 #define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0) +#define GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS BIT(13) #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 8a7a300163e5..93766aee3e7c 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -52,6 +52,10 @@ #define PCIE20_PARF_DBI_BASE_ADDR 0x168 #define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C #define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174 +#define AHB_CLK_EN BIT(0) +#define MSTR_AXI_CLK_EN BIT(1) +#define BYPASS BIT(4) + #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT 0x178 #define PCIE20_PARF_AXI_MSTR_WR_ADDR_HALT_V2 0x1A8 #define PCIE20_PARF_LTSSM 0x1B0 @@ -94,6 +98,12 @@ #define SLV_ADDR_SPACE_SZ 0x10000000 #define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xa0 +#define PCIE_CAP_CURR_DEEMPHASIS BIT(16) +#define SPEED_GEN1 0x1 +#define SPEED_GEN2 0x2 +#define SPEED_GEN3 0x3 +#define AXI_CLK_RATE 200000000 +#define RCHNG_CLK_RATE 100000000 #define DEVICE_TYPE_RC 0x4 @@ -168,6 +178,11 @@ struct qcom_pcie_resources_2_7_0 { struct clk *pipe_clk; }; +struct qcom_pcie_resources_2_9_0 { + struct clk_bulk_data clks[5]; + struct reset_control *rst; +}; + union qcom_pcie_resources { struct qcom_pcie_resources_1_0_0 v1_0_0; struct qcom_pcie_resources_2_1_0 v2_1_0; @@ -175,6 +190,7 @@ union qcom_pcie_resources { struct qcom_pcie_resources_2_3_3 v2_3_3; struct qcom_pcie_resources_2_4_0 v2_4_0; struct qcom_pcie_resources_2_7_0 v2_7_0; + struct qcom_pcie_resources_2_9_0 v2_9_0; }; struct qcom_pcie; @@ -1266,6 +1282,130 @@ static void qcom_pcie_post_deinit_2_7_0(struct qcom_pcie *pcie) clk_disable_unprepare(res->pipe_clk); } +static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; + struct dw_pcie *pci = pcie->pci; + struct device *dev = pci->dev; + int ret; + + res->clks[0].id = "iface"; + res->clks[1].id = "axi_m"; + res->clks[2].id = "axi_s"; + res->clks[3].id = "axi_bridge"; + res->clks[4].id = "rchng"; + + ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks); + if (ret < 0) + return ret; + + res->rst = devm_reset_control_array_get_exclusive(dev); + if (IS_ERR(res->rst)) + return PTR_ERR(res->rst); + + return 0; +} + +static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; + + clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks); +} + +static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie) +{ + struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0; + struct device *dev = pcie->pci->dev; + int ret; + + ret = reset_control_assert(res->rst); + if (ret) { + dev_err(dev, "reset assert failed (%d)\n", ret); + return ret; + } + + usleep_range(2000, 2500); + + ret = reset_control_deassert(res->rst); + if (ret) { + dev_err(dev, "reset deassert failed (%d)\n", ret); + return ret; + } + + /* + * Don't have a way to see if the reset has completed. + * Wait for some time. + */ + usleep_range(2000, 2500); + + ret = clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks); + if (ret) + goto err_reset; + + return 0; + + /* + * Not checking for failure, will anyway return + * the original failure in 'ret'. + */ +err_reset: + reset_control_assert(res->rst); + + return ret; +} + +static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie) +{ + struct dw_pcie *pci = pcie->pci; + u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + u32 val; + int i; + + writel(SLV_ADDR_SPACE_SZ, + pcie->parf + PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE); + + val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); + val &= ~BIT(0); + writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); + + writel(0, pcie->parf + PCIE20_PARF_DBI_BASE_ADDR); + + writel(DEVICE_TYPE_RC, pcie->parf + PCIE20_PARF_DEVICE_TYPE); + writel(BYPASS | MSTR_AXI_CLK_EN | AHB_CLK_EN, + pcie->parf + PCIE20_PARF_MHI_CLOCK_RESET_CTRL); + writel(GEN3_RELATED_OFF_RXEQ_RGRDLESS_RXTS + | GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL, + pci->dbi_base + GEN3_RELATED_OFF); + + writel(MST_WAKEUP_EN | SLV_WAKEUP_EN | MSTR_ACLK_CGC_DIS + | SLV_ACLK_CGC_DIS | CORE_CLK_CGC_DIS | + AUX_PWR_DET | L23_CLK_RMV_DIS | L1_CLK_RMV_DIS, + pcie->parf + PCIE20_PARF_SYS_CTRL); + + writel(0, pcie->parf + PCIE20_PARF_Q2A_FLUSH); + + dw_pcie_dbi_ro_wr_en(pci); + writel(PCIE_CAP_LINK1_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP); + + /* Configure PCIe link capabilities for ASPM */ + val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP); + val &= ~PCI_EXP_LNKCAP_ASPMS; + writel(val, pci->dbi_base + offset + PCI_EXP_LNKCAP); + + writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset + + PCI_EXP_DEVCTL2); + + writel(PCIE_CAP_CURR_DEEMPHASIS | SPEED_GEN3, + pci->dbi_base + offset + PCI_EXP_DEVCTL2); + + for (i = 0;i < 256;i++) + writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N + + (4 * i)); + + return 0; +} + static int qcom_pcie_link_up(struct dw_pcie *pci) { u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); @@ -1456,6 +1596,15 @@ static const struct qcom_pcie_ops ops_1_9_0 = { .config_sid = qcom_pcie_config_sid_sm8250, }; +/* Qcom IP rev.: 2.9.0 Synopsys IP rev.: 5.00a */ +static const struct qcom_pcie_ops ops_2_9_0 = { + .get_resources = qcom_pcie_get_resources_2_9_0, + .init = qcom_pcie_init_2_9_0, + .post_init = qcom_pcie_post_init_2_9_0, + .deinit = qcom_pcie_deinit_2_9_0, + .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, +}; + static const struct dw_pcie_ops dw_pcie_ops = { .link_up = qcom_pcie_link_up, .start_link = qcom_pcie_start_link, @@ -1555,6 +1704,7 @@ static const struct of_device_id qcom_pcie_match[] = { { .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 }, { .compatible = "qcom,pcie-sdm845", .data = &ops_2_7_0 }, { .compatible = "qcom,pcie-sm8250", .data = &ops_1_9_0 }, + { .compatible = "qcom,pcie-ipq6018", .data = &ops_2_9_0 }, { } };