From: Andrey Smirnov <andrew.smirnov@gmail.com> To: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Andrey Smirnov <andrew.smirnov@gmail.com>, linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>, Lucas Stach <l.stach@pengutronix.de>, Richard Zhu <Richard.Zhu@freescale.com>, gary.bisson@boundarydevices.com Subject: [PATCH v3 1/3] PCI: imx6: Use enum instead of bool for variant indicator Date: Wed, 20 Apr 2016 08:45:29 -0700 [thread overview] Message-ID: <1461167131-26025-1-git-send-email-andrew.smirnov@gmail.com> (raw) Use enumerated type instead of a boolean flag to specify the variant of the PCIe IP block (6Q, 6SX, etc). This patch has zero functional impact, however it makes the code easier to extend for the case of more than 2 possible variants of an IP block (of which there are). Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> --- Changes since v2: - Removed default clause in all introduced switch statements - Switched to using of_device_get_match_data instead of explicit of_device_is_compatible checks - Added a mention of the new DT compatibility string in the documentation Changes since v1: - Patchset is rebased against https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/host-imx6 - DTS files changes moved into a separate patch drivers/pci/host/pci-imx6.c | 124 ++++++++++++++++++++++++-------------------- 1 file changed, 67 insertions(+), 57 deletions(-) diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 0f6d630..a77e7fd 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -19,6 +19,7 @@ #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> #include <linux/module.h> #include <linux/of_gpio.h> +#include <linux/of_device.h> #include <linux/pci.h> #include <linux/platform_device.h> #include <linux/regmap.h> @@ -31,6 +32,11 @@ #define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp) +enum imx6_pcie_variants { + IMX6Q, + IMX6SX +}; + struct imx6_pcie { struct gpio_desc *reset_gpio; struct clk *pcie_bus; @@ -39,7 +45,7 @@ struct imx6_pcie { struct clk *pcie; struct pcie_port pp; struct regmap *iomuxc_gpr; - bool is_imx6sx; + enum imx6_pcie_variants variant; void __iomem *mem_base; u32 tx_deemph_gen1; u32 tx_deemph_gen2_3p5db; @@ -238,7 +244,8 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); u32 val, gpr1, gpr12; - if (imx6_pcie->is_imx6sx) { + switch (imx6_pcie->variant) { + case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, IMX6SX_GPR12_PCIE_TEST_POWERDOWN); @@ -246,72 +253,76 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET, IMX6SX_GPR5_PCIE_BTNRST_RESET); - return 0; - } - - /* - * If the bootloader already enabled the link we need some special - * handling to get the core back into a state where it is safe to - * touch it for configuration. As there is no dedicated reset signal - * wired up for MX6QDL, we need to manually force LTSSM into "detect" - * state before completely disabling LTSSM, which is a prerequisite - * for core configuration. - * - * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong - * indication that the bootloader activated the link. - */ - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1); - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12); - - if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) && - (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) { - val = readl(pp->dbi_base + PCIE_PL_PFLR); - val &= ~PCIE_PL_PFLR_LINK_STATE_MASK; - val |= PCIE_PL_PFLR_FORCE_LINK; - writel(val, pp->dbi_base + PCIE_PL_PFLR); + break; + case IMX6Q: + /* + * If the bootloader already enabled the link we need some special + * handling to get the core back into a state where it is safe to + * touch it for configuration. As there is no dedicated reset signal + * wired up for MX6QDL, we need to manually force LTSSM into "detect" + * state before completely disabling LTSSM, which is a prerequisite + * for core configuration. + * + * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong + * indication that the bootloader activated the link. + */ + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1); + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12); + + if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) && + (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) { + val = readl(pp->dbi_base + PCIE_PL_PFLR); + val &= ~PCIE_PL_PFLR_LINK_STATE_MASK; + val |= PCIE_PL_PFLR_FORCE_LINK; + writel(val, pp->dbi_base + PCIE_PL_PFLR); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); + } - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); + break; } - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); - return 0; } static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) { struct pcie_port *pp = &imx6_pcie->pp; - int ret; + int ret = 0; - if (imx6_pcie->is_imx6sx) { + switch (imx6_pcie->variant) { + case IMX6SX: ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi); if (ret) { dev_err(pp->dev, "unable to enable pcie_axi clock\n"); - return ret; + break; } regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0); - return ret; + break; + case IMX6Q: + /* power up core phy and enable ref clock */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); + /* + * the async reset input need ref clock to sync internally, + * when the ref clock comes after reset, internal synced + * reset time is too short, cannot meet the requirement. + * add one ~10us delay here. + */ + udelay(10); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); + break; } - /* power up core phy and enable ref clock */ - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); - /* - * the async reset input need ref clock to sync internally, - * when the ref clock comes after reset, internal synced - * reset time is too short, cannot meet the requirement. - * add one ~10us delay here. - */ - udelay(10); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); - return 0; + return ret; } static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) @@ -353,7 +364,7 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1); } - if (imx6_pcie->is_imx6sx) + if (imx6_pcie->variant == IMX6SX) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET, 0); @@ -374,11 +385,10 @@ static void imx6_pcie_init_phy(struct pcie_port *pp) { struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); - if (imx6_pcie->is_imx6sx) { + if (imx6_pcie->variant == IMX6SX) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_RX_EQ_MASK, IMX6SX_GPR12_PCIE_RX_EQ_2); - } regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); @@ -585,8 +595,8 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) pp = &imx6_pcie->pp; pp->dev = &pdev->dev; - imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node, - "fsl,imx6sx-pcie"); + imx6_pcie->variant = + (enum imx6_pcie_variants)of_device_get_match_data(&pdev->dev); /* Added for PCI abort handling */ hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0, @@ -623,7 +633,7 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->pcie); } - if (imx6_pcie->is_imx6sx) { + if (imx6_pcie->variant == IMX6SX) { imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev, "pcie_inbound_axi"); if (IS_ERR(imx6_pcie->pcie_inbound_axi)) { @@ -679,8 +689,8 @@ static void imx6_pcie_shutdown(struct platform_device *pdev) } static const struct of_device_id imx6_pcie_of_match[] = { - { .compatible = "fsl,imx6q-pcie", }, - { .compatible = "fsl,imx6sx-pcie", }, + { .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, }, + { .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, }, {}, }; MODULE_DEVICE_TABLE(of, imx6_pcie_of_match); -- 2.5.5
WARNING: multiple messages have this Message-ID (diff)
From: andrew.smirnov@gmail.com (Andrey Smirnov) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 1/3] PCI: imx6: Use enum instead of bool for variant indicator Date: Wed, 20 Apr 2016 08:45:29 -0700 [thread overview] Message-ID: <1461167131-26025-1-git-send-email-andrew.smirnov@gmail.com> (raw) Use enumerated type instead of a boolean flag to specify the variant of the PCIe IP block (6Q, 6SX, etc). This patch has zero functional impact, however it makes the code easier to extend for the case of more than 2 possible variants of an IP block (of which there are). Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> --- Changes since v2: - Removed default clause in all introduced switch statements - Switched to using of_device_get_match_data instead of explicit of_device_is_compatible checks - Added a mention of the new DT compatibility string in the documentation Changes since v1: - Patchset is rebased against https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/host-imx6 - DTS files changes moved into a separate patch drivers/pci/host/pci-imx6.c | 124 ++++++++++++++++++++++++-------------------- 1 file changed, 67 insertions(+), 57 deletions(-) diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 0f6d630..a77e7fd 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -19,6 +19,7 @@ #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> #include <linux/module.h> #include <linux/of_gpio.h> +#include <linux/of_device.h> #include <linux/pci.h> #include <linux/platform_device.h> #include <linux/regmap.h> @@ -31,6 +32,11 @@ #define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp) +enum imx6_pcie_variants { + IMX6Q, + IMX6SX +}; + struct imx6_pcie { struct gpio_desc *reset_gpio; struct clk *pcie_bus; @@ -39,7 +45,7 @@ struct imx6_pcie { struct clk *pcie; struct pcie_port pp; struct regmap *iomuxc_gpr; - bool is_imx6sx; + enum imx6_pcie_variants variant; void __iomem *mem_base; u32 tx_deemph_gen1; u32 tx_deemph_gen2_3p5db; @@ -238,7 +244,8 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); u32 val, gpr1, gpr12; - if (imx6_pcie->is_imx6sx) { + switch (imx6_pcie->variant) { + case IMX6SX: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, IMX6SX_GPR12_PCIE_TEST_POWERDOWN); @@ -246,72 +253,76 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET, IMX6SX_GPR5_PCIE_BTNRST_RESET); - return 0; - } - - /* - * If the bootloader already enabled the link we need some special - * handling to get the core back into a state where it is safe to - * touch it for configuration. As there is no dedicated reset signal - * wired up for MX6QDL, we need to manually force LTSSM into "detect" - * state before completely disabling LTSSM, which is a prerequisite - * for core configuration. - * - * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong - * indication that the bootloader activated the link. - */ - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1); - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12); - - if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) && - (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) { - val = readl(pp->dbi_base + PCIE_PL_PFLR); - val &= ~PCIE_PL_PFLR_LINK_STATE_MASK; - val |= PCIE_PL_PFLR_FORCE_LINK; - writel(val, pp->dbi_base + PCIE_PL_PFLR); + break; + case IMX6Q: + /* + * If the bootloader already enabled the link we need some special + * handling to get the core back into a state where it is safe to + * touch it for configuration. As there is no dedicated reset signal + * wired up for MX6QDL, we need to manually force LTSSM into "detect" + * state before completely disabling LTSSM, which is a prerequisite + * for core configuration. + * + * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong + * indication that the bootloader activated the link. + */ + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1); + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12); + + if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) && + (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) { + val = readl(pp->dbi_base + PCIE_PL_PFLR); + val &= ~PCIE_PL_PFLR_LINK_STATE_MASK; + val |= PCIE_PL_PFLR_FORCE_LINK; + writel(val, pp->dbi_base + PCIE_PL_PFLR); + + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, + IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); + } - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); + break; } - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); - return 0; } static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) { struct pcie_port *pp = &imx6_pcie->pp; - int ret; + int ret = 0; - if (imx6_pcie->is_imx6sx) { + switch (imx6_pcie->variant) { + case IMX6SX: ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi); if (ret) { dev_err(pp->dev, "unable to enable pcie_axi clock\n"); - return ret; + break; } regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0); - return ret; + break; + case IMX6Q: + /* power up core phy and enable ref clock */ + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); + /* + * the async reset input need ref clock to sync internally, + * when the ref clock comes after reset, internal synced + * reset time is too short, cannot meet the requirement. + * add one ~10us delay here. + */ + udelay(10); + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, + IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); + break; } - /* power up core phy and enable ref clock */ - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); - /* - * the async reset input need ref clock to sync internally, - * when the ref clock comes after reset, internal synced - * reset time is too short, cannot meet the requirement. - * add one ~10us delay here. - */ - udelay(10); - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, - IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); - return 0; + return ret; } static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) @@ -353,7 +364,7 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1); } - if (imx6_pcie->is_imx6sx) + if (imx6_pcie->variant == IMX6SX) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET, 0); @@ -374,11 +385,10 @@ static void imx6_pcie_init_phy(struct pcie_port *pp) { struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); - if (imx6_pcie->is_imx6sx) { + if (imx6_pcie->variant == IMX6SX) regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_RX_EQ_MASK, IMX6SX_GPR12_PCIE_RX_EQ_2); - } regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6Q_GPR12_PCIE_CTL_2, 0 << 10); @@ -585,8 +595,8 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) pp = &imx6_pcie->pp; pp->dev = &pdev->dev; - imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node, - "fsl,imx6sx-pcie"); + imx6_pcie->variant = + (enum imx6_pcie_variants)of_device_get_match_data(&pdev->dev); /* Added for PCI abort handling */ hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0, @@ -623,7 +633,7 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(imx6_pcie->pcie); } - if (imx6_pcie->is_imx6sx) { + if (imx6_pcie->variant == IMX6SX) { imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev, "pcie_inbound_axi"); if (IS_ERR(imx6_pcie->pcie_inbound_axi)) { @@ -679,8 +689,8 @@ static void imx6_pcie_shutdown(struct platform_device *pdev) } static const struct of_device_id imx6_pcie_of_match[] = { - { .compatible = "fsl,imx6q-pcie", }, - { .compatible = "fsl,imx6sx-pcie", }, + { .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, }, + { .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, }, {}, }; MODULE_DEVICE_TABLE(of, imx6_pcie_of_match); -- 2.5.5
next reply other threads:[~2016-04-20 15:45 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-04-20 15:45 Andrey Smirnov [this message] 2016-04-20 15:45 ` [PATCH v3 1/3] PCI: imx6: Use enum instead of bool for variant indicator Andrey Smirnov 2016-04-20 15:45 ` [PATCH v3 2/3] PCI: imx6: Implement reset sequence for i.MX6+ Andrey Smirnov 2016-04-20 15:45 ` Andrey Smirnov 2016-04-29 1:47 ` Fabio Estevam 2016-04-29 1:47 ` Fabio Estevam 2016-04-29 1:47 ` Fabio Estevam 2016-04-29 12:52 ` Gary Bisson 2016-04-29 12:52 ` Gary Bisson 2016-04-29 12:52 ` Gary Bisson 2016-04-20 15:45 ` [PATCH v3 3/3] ARM: dts: imx6qp: Specify imx6qp version of PCIe core Andrey Smirnov 2016-04-20 15:45 ` Andrey Smirnov 2016-04-29 1:48 ` Fabio Estevam 2016-04-29 1:48 ` Fabio Estevam 2016-04-29 1:48 ` Fabio Estevam 2016-04-29 1:48 ` Fabio Estevam 2016-04-29 12:52 ` Gary Bisson 2016-04-29 12:52 ` Gary Bisson 2016-04-29 12:52 ` Gary Bisson 2016-04-29 1:46 ` [PATCH v3 1/3] PCI: imx6: Use enum instead of bool for variant indicator Fabio Estevam 2016-04-29 1:46 ` Fabio Estevam 2016-04-29 1:46 ` Fabio Estevam 2016-05-02 19:37 ` Bjorn Helgaas 2016-05-02 19:37 ` Bjorn Helgaas
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