[1/3] ARM: tegra: pcie: Add tegra3 support

Message ID	1365435688-4179-1-git-send-email-jagarwal@nvidia.com (mailing list archive)
State	New, archived
Delegated to:	Bjorn Helgaas
Headers	show Return-Path: <linux-pci-owner@vger.kernel.org> From: Jay Agarwal <jagarwal@nvidia.com> To: <linux@arm.linux.org.uk>, <swarren@wwwdotorg.org>, <thierry.reding@avionic-design.de>, <ldewangan@nvidia.com>, <bhelgaas@google.com>, <olof@lixom.net>, <hdoyu@nvidia.com>, <pgaikwad@nvidia.com>, <mturquette@linaro.org>, <pdeschrijver@nvidia.com>, <linux-arm-kernel@lists.infradead.org>, <linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-pci@vger.kernel.org> CC: <jtukkinen@nvidia.com>, <kthota@nvidia.com>, <jagarwal@nvidia.com> Subject: [PATCH 1/3] ARM: tegra: pcie: Add tegra3 support Date: Mon, 8 Apr 2013 21:11:26 +0530 Message-ID: <1365435688-4179-1-git-send-email-jagarwal@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-pci-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c index ba6f51b..6a80b40 100644 --- a/drivers/clk/tegra/clk-tegra30.c +++ b/drivers/clk/tegra/clk-tegra30.c @@ -1592,6 +1592,12 @@ static void __init tegra30_periph_clk_init(void) clk_register_clkdev(clk, "afi", "tegra-pcie"); clks[afi] = clk; + /* pciex */ + clk = tegra_clk_register_periph_gate("pciex", "pll_e", 0, clk_base, 0, + 74, &periph_u_regs, periph_clk_enb_refcnt); + clk_register_clkdev(clk, "pciex", NULL); + clks[pciex] = clk; + /* kfuse */ clk = tegra_clk_register_periph_gate("kfuse", "clk_m", TEGRA_PERIPH_ON_APB, @@ -1710,11 +1716,6 @@ static void __init tegra30_fixed_clk_init(void) 1, 0, &cml_lock); clk_register_clkdev(clk, "cml1", NULL); clks[cml1] = clk; - - /* pciex */ - clk = clk_register_fixed_rate(NULL, "pciex", "pll_e", 0, 100000000); - clk_register_clkdev(clk, "pciex", NULL); - clks[pciex] = clk; } static void __init tegra30_osc_clk_init(void) @@ -1930,7 +1931,6 @@ static struct tegra_clk_duplicate tegra_clk_duplicates[] = { TEGRA_CLK_DUPLICATE(bsea, "nvavp", "bsea"), TEGRA_CLK_DUPLICATE(cml1, "tegra_sata_cml", NULL), TEGRA_CLK_DUPLICATE(cml0, "tegra_pcie", "cml"), - TEGRA_CLK_DUPLICATE(pciex, "tegra_pcie", "pciex"), TEGRA_CLK_DUPLICATE(vcp, "nvavp", "vcp"), TEGRA_CLK_DUPLICATE(clk_max, NULL, NULL), /* MUST be the last entry */ }; diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 24085ed..79c0996 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -51,7 +51,6 @@ #include <mach/powergate.h> #define INT_PCI_MSI_NR (8 * 32) -#define TEGRA_MAX_PORTS 2 /* register definitions */ @@ -143,14 +142,15 @@ #define AFI_INTR_EN_DFPCI_DECERR (1 << 5) #define AFI_INTR_EN_AXI_DECERR (1 << 6) #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7) +#define AFI_INTR_EN_PRSNT_SENSE (1 << 8) #define AFI_PCIE_CONFIG 0x0f8 #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1)) #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20) -#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20) +#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20) @@ -161,8 +161,11 @@ #define AFI_PEX1_CTRL 0x118 #define AFI_PEX2_CTRL 0x128 #define AFI_PEX_CTRL_RST (1 << 0) +#define AFI_PEX_CTRL_CLKREQ_EN (1 << 1) #define AFI_PEX_CTRL_REFCLK_EN (1 << 3) +#define AFI_PEXBIAS_CTRL_0 0x168 + #define RP_VEND_XP 0x00000F00 #define RP_VEND_XP_DL_UP (1 << 30) @@ -176,7 +179,8 @@ #define PADS_CTL_TX_DATA_EN_1L (1 << 6) #define PADS_CTL_RX_DATA_EN_1L (1 << 10) -#define PADS_PLL_CTL 0x000000B8 +#define PADS_PLL_CTL_T20 0x000000B8 +#define PADS_PLL_CTL_T30 0x000000B4 #define PADS_PLL_CTL_RST_B4SM (1 << 1) #define PADS_PLL_CTL_LOCKDET (1 << 8) #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16) @@ -184,8 +188,11 @@ #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16) #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16) #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20) +#define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22) #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20) #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20) +#define PADS_REFCLK_CFG0 0x000000C8 +#define PADS_REFCLK_CFG1 0x000000CC struct tegra_msi { DECLARE_BITMAP(used, INT_PCI_MSI_NR); @@ -196,6 +203,19 @@ struct tegra_msi { int irq; }; +/* used to differente tegra chips code */ +struct tegra_pcie_soc_data { + unsigned int num_max_ports; + unsigned int pads_pll_ctl; + unsigned int tx_ref_sel; + unsigned int msi_base_shift; + bool pex_clkreq_en; + bool pex_bias_ctrl; + bool intr_prsnt_sense; + bool need_avdd_supply; + bool need_cml0_clk; +}; + static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip) { return container_of(chip, struct tegra_msi, chip); @@ -220,6 +240,7 @@ struct tegra_pcie { struct clk *afi_clk; struct clk *pcie_xclk; struct clk *pll_e; + struct clk *cml0_clk; struct tegra_msi msi; @@ -229,6 +250,9 @@ struct tegra_pcie { struct regulator *pex_clk_supply; struct regulator *vdd_supply; + struct regulator *avdd_supply; + + struct tegra_pcie_soc_data *soc_data; }; struct tegra_pcie_port { @@ -511,12 +535,15 @@ static void tegra_pcie_port_reset(struct tegra_pcie_port *port) static void tegra_pcie_port_enable(struct tegra_pcie_port *port) { + struct tegra_pcie_soc_data *soc = port->pcie->soc_data; unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); unsigned long value; /* enable reference clock */ value = afi_readl(port->pcie, ctrl); value |= AFI_PEX_CTRL_REFCLK_EN; + if (soc->pex_clkreq_en) + value |= AFI_PEX_CTRL_CLKREQ_EN; afi_writel(port->pcie, value, ctrl); tegra_pcie_port_reset(port); @@ -569,6 +596,8 @@ static void tegra_pcie_fixup_class(struct pci_dev *dev) } DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class); /* Tegra PCIE requires relaxed ordering */ static void tegra_pcie_relax_enable(struct pci_dev *dev) @@ -749,6 +778,11 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) struct tegra_pcie_port *port; unsigned int timeout; unsigned long value; + struct tegra_pcie_soc_data *soc = pcie->soc_data; + + /* power down to PCIe slot clock bias pad */ + if (soc->pex_bias_ctrl) + afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0); /* configure mode and disable all ports */ value = afi_readl(pcie, AFI_PCIE_CONFIG); @@ -776,26 +810,26 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) * Set up PHY PLL inputs select PLLE output as refclock, * set TX ref sel to div10 (not div5). */ - value = pads_readl(pcie, PADS_PLL_CTL); + value = pads_readl(pcie, soc->pads_pll_ctl); value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK); - value |= (PADS_PLL_CTL_REFCLK_INTERNAL_CML | PADS_PLL_CTL_TXCLKREF_DIV10); - pads_writel(pcie, value, PADS_PLL_CTL); + value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel; + pads_writel(pcie, value, soc->pads_pll_ctl); /* take PLL out of reset */ - value = pads_readl(pcie, PADS_PLL_CTL); + value = pads_readl(pcie, soc->pads_pll_ctl); value |= PADS_PLL_CTL_RST_B4SM; - pads_writel(pcie, value, PADS_PLL_CTL); + pads_writel(pcie, value, soc->pads_pll_ctl); /* * Hack, set the clock voltage to the DEFAULT provided by hw folks. * This doesn't exist in the documentation. */ - pads_writel(pcie, 0xfa5cfa5c, 0xc8); + pads_writel(pcie, 0xfa5cfa5c, PADS_REFCLK_CFG0); /* wait for the PLL to lock */ timeout = 300; do { - value = pads_readl(pcie, PADS_PLL_CTL); + value = pads_readl(pcie, soc->pads_pll_ctl); usleep_range(1000, 1000); if (--timeout == 0) { pr_err("Tegra PCIe error: timeout waiting for PLL\n"); @@ -824,6 +858,8 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR | AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR; + if (soc->intr_prsnt_sense) + value |= AFI_INTR_EN_PRSNT_SENSE; afi_writel(pcie, value, AFI_AFI_INTR_ENABLE); afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE); @@ -838,6 +874,7 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) static void tegra_pcie_power_off(struct tegra_pcie *pcie) { + struct tegra_pcie_soc_data *soc = pcie->soc_data; int err; /* TODO: disable and unprepare clocks? */ @@ -849,19 +886,26 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie) tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); tegra_pmc_pcie_xclk_clamp(true); + if (soc->need_avdd_supply) { + err = regulator_disable(pcie->avdd_supply); + if (err < 0) + dev_warn(pcie->dev, "failed to disable AVDD regulator: %d\n", + err); + } err = regulator_disable(pcie->pex_clk_supply); if (err < 0) - dev_err(pcie->dev, "failed to disable pex-clk regulator: %d\n", + dev_warn(pcie->dev, "failed to disable pex-clk regulator: %d\n", err); err = regulator_disable(pcie->vdd_supply); if (err < 0) - dev_err(pcie->dev, "failed to disable VDD regulator: %d\n", + dev_warn(pcie->dev, "failed to disable VDD regulator: %d\n", err); } static int tegra_pcie_power_on(struct tegra_pcie *pcie) { + struct tegra_pcie_soc_data *soc = pcie->soc_data; int err; tegra_periph_reset_assert(pcie->pcie_xclk); @@ -885,6 +929,15 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie) return err; } + if (soc->need_avdd_supply) { + err = regulator_enable(pcie->avdd_supply); + if (err < 0) { + dev_err(pcie->dev, "failed to enable AVDD regulator: %d\n", + err); + return err; + } + } + err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, pcie->pex_clk); if (err) { @@ -902,6 +955,15 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie) return err; } + if (soc->need_cml0_clk) { + err = clk_prepare_enable(pcie->cml0_clk); + if (err < 0) { + dev_err(pcie->dev, "failed to enable cml0 clock: %d\n", + err); + return err; + } + } + err = clk_prepare_enable(pcie->pll_e); if (err < 0) { dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err); @@ -913,6 +975,8 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie) static int tegra_pcie_clocks_get(struct tegra_pcie *pcie) { + struct tegra_pcie_soc_data *soc = pcie->soc_data; + pcie->pex_clk = devm_clk_get(pcie->dev, "pex"); if (IS_ERR(pcie->pex_clk)) return PTR_ERR(pcie->pex_clk); @@ -929,6 +993,11 @@ static int tegra_pcie_clocks_get(struct tegra_pcie *pcie) if (IS_ERR(pcie->pll_e)) return PTR_ERR(pcie->pll_e); + if (soc->need_cml0_clk) { + pcie->cml0_clk = devm_clk_get(pcie->dev, "cml0"); + if (IS_ERR(pcie->cml0_clk)) + return PTR_ERR(pcie->cml0_clk); + } return 0; } @@ -1151,6 +1220,7 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) { struct platform_device *pdev = to_platform_device(pcie->dev); struct tegra_msi *msi = &pcie->msi; + struct tegra_pcie_soc_data *soc = pcie->soc_data; unsigned long base; int err; u32 reg; @@ -1187,7 +1257,7 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) msi->pages = __get_free_pages(GFP_KERNEL, 3); base = virt_to_phys((void *)msi->pages); - afi_writel(pcie, base, AFI_MSI_FPCI_BAR_ST); + afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST); afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST); /* this register is in 4K increments */ afi_writel(pcie, 1, AFI_MSI_BAR_SZ); @@ -1284,6 +1354,7 @@ static u32 tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes) static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) { struct device_node *np = pcie->dev->of_node, *port; + struct tegra_pcie_soc_data *soc = pcie->soc_data; const __be32 *range = NULL; struct resource res; u32 lanes = 0; @@ -1297,6 +1368,12 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) if (IS_ERR(pcie->pex_clk_supply)) return PTR_ERR(pcie->pex_clk_supply); + if (soc->need_avdd_supply) { + pcie->avdd_supply = devm_regulator_get(pcie->dev, "avdd"); + if (IS_ERR(pcie->avdd_supply)) + return PTR_ERR(pcie->avdd_supply); + } + while ((range = of_pci_process_ranges(np, &res, range)) != NULL) { switch (res.flags & IORESOURCE_TYPE_BITS) { case IORESOURCE_IO: @@ -1341,7 +1418,7 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) index = PCI_SLOT(err); - if (index < 1 || index > TEGRA_MAX_PORTS) { + if (index < 1 || index > pcie->soc_data->num_max_ports) { dev_err(pcie->dev, "invalid port number: %d\n", index); return -EINVAL; } @@ -1477,8 +1554,39 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie) return 0; } +static const struct tegra_pcie_soc_data tegra20_pcie_data = { + .num_max_ports = 2, + .pads_pll_ctl = PADS_PLL_CTL_T20, + .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10, + .msi_base_shift = 0, + .pex_clkreq_en = false, + .pex_bias_ctrl = false, + .intr_prsnt_sense = false, + .need_avdd_supply = false, + .need_cml0_clk = false, +}; + +static const struct tegra_pcie_soc_data tegra30_pcie_data = { + .num_max_ports = 3, + .pads_pll_ctl = PADS_PLL_CTL_T30, + .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, + .msi_base_shift = 8, + .pex_clkreq_en = true, + .pex_bias_ctrl = true, + .intr_prsnt_sense = true, + .need_avdd_supply = true, + .need_cml0_clk = true, +}; + +static const struct of_device_id tegra_pcie_of_match[] = { + { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data}, + { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data}, + { }, +}; + static int tegra_pcie_probe(struct platform_device *pdev) { + const struct of_device_id *match; struct tegra_pcie *pcie; int err; @@ -1489,6 +1597,11 @@ static int tegra_pcie_probe(struct platform_device *pdev) INIT_LIST_HEAD(&pcie->busses); INIT_LIST_HEAD(&pcie->ports); pcie->dev = &pdev->dev; + match = of_match_device(tegra_pcie_of_match, &pdev->dev); + if (match) + pcie->soc_data = (struct tegra_pcie_soc_data *)match->data; + else + return -ENODEV; err = tegra_pcie_parse_dt(pcie); if (err < 0) @@ -1560,11 +1673,6 @@ static int tegra_pcie_remove(struct platform_device *pdev) return 0; } -static const struct of_device_id tegra_pcie_of_match[] = { - { .compatible = "nvidia,tegra20-pcie", }, - { }, -}; - static struct platform_driver tegra_pcie_driver = { .driver = { .name = "tegra-pcie",

[1/3] ARM: tegra: pcie: Add tegra3 support

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