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Wed, 16 Apr 2014 13:43:26 +0900 (KST) From: Jingoo Han To: 'linux-pci' , 'Bjorn Helgaas' References: <000801cf592e$30b7bff0$92273fd0$%han@samsung.com> In-reply-to: <000801cf592e$30b7bff0$92273fd0$%han@samsung.com> Subject: [RFC PATCH 2/2] PCI: exynos: Add PCIe support for Samsung GH7 SoC Date: Wed, 16 Apr 2014 13:43:26 +0900 Message-id: <000a01cf592e$67e592e0$37b0b8a0$%han@samsung.com> MIME-version: 1.0 X-Mailer: Microsoft Office Outlook 12.0 Thread-index: Ac9ZLjB5lnZMYwshRiWF5lDNQlfulQAACcWA Content-language: ko X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrCIsWRmVeSWpSXmKPExsVy+t8zQ918Lr9gg75ZXBZ/Jx1jt1jSlGFx eeElVoveBVfZLN4fesZssenxNVaLy7vmsFmcnXeczeLA0nYWB06PNfPWMHr8/jWJ0WPBplKP zUvqPW7/e8zs0bdlFaPH501yAexRXDYpqTmZZalF+nYJXBltl34zFzzzrujZfYGtgfG0Qxcj J4eEgInE1a6/rBC2mMSFe+vZuhi5OIQEljFKXLm7jxWmqO3GDWaIxHRGiXl956GqfjNK3J69 kRGkik1ATeLLl8PsILaIQIjE77u3wYqYBf4wSuw8eY8ZJCEkYCvx/eIrJhCbU8BO4vvy5ywg trCAl8SW+xPZQGwWAVWJRTe6wOK8QPV/ml4yQtiCEj8m3wOLMwtoSazfeZwJwpaX2LzmLdB8 DqBT1SUe/dWFuMFI4uP3jewQJSIS+168YwS5R0KglUPiytR5LBC7BCS+TT7EAtErK7HpADPE x5ISB1fcYJnAKDELyeZZSDbPQrJ5FpIVCxhZVjGKphYkFxQnpReZ6BUn5haX5qXrJefnbmKE xPiEHYz3DlgfYkwGWj+RWUo0OR+YIvJK4g2NzYwsTE1MjY3MLc1IE1YS51V7lBQkJJCeWJKa nZpakFoUX1Sak1p8iJGJg1OqgVHExrr9adjy3zor2jd2FLzjaTANONYipP+CeblA1bxzggql MvlW7/quBQq840kWlvW9dnzKM7cVKaIHvBT275gnK+0Smrh4hW+AwLbjM7deKVQODvx2SHyW /7f567vkKn5levO9mb58gosN68LTjQXXhMNPiszlfjtfWGHBqn9cyT9/ONx3XKbEUpyRaKjF XFScCAAXDuLOBwMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrIKsWRmVeSWpSXmKPExsVy+t9jQd18Lr9gg2fzWCz+TjrGbrGkKcPi 8sJLrBa9C66yWbw/9IzZYtPja6wWl3fNYbM4O+84m8WBpe0sDpwea+atYfT4/WsSo8eCTaUe m5fUe9z+95jZo2/LKkaPz5vkAtijGhhtMlITU1KLFFLzkvNTMvPSbZW8g+Od403NDAx1DS0t zJUU8hJzU22VXHwCdN0yc4AOU1IoS8wpBQoFJBYXK+nbYZoQGuKmawHTGKHrGxIE12NkgAYS 1jFmtF36zVzwzLuiZ/cFtgbG0w5djJwcEgImEm03bjBD2GISF+6tZ+ti5OIQEpjOKDGv7zyU 85tR4vbsjYwgVWwCahJfvhxmB7FFBEIkft+9DVbELPCHUWLnyXtgo4QEbCW+X3zFBGJzCthJ fF/+nAXEFhbwkthyfyIbiM0ioCqx6EYXWJwXqP5P00tGCFtQ4sfke2BxZgEtifU7jzNB2PIS m9e8BZrPAXSqusSjv7oQNxhJfPy+kR2iRERi34t3jBMYhWYhmTQLyaRZSCbNQtKygJFlFaNo akFyQXFSeq6hXnFibnFpXrpecn7uJkZwAnkmtYNxZYPFIUYBDkYlHt4ZOb7BQqyJZcWVuYcY JTiYlUR4v3wBCvGmJFZWpRblxxeV5qQWH2JMBnp0IrOUaHI+MLnllcQbGpuYGVkamVkYmZib kyasJM57oNU6UEggPbEkNTs1tSC1CGYLEwenVAPj4a6E2QETY+yC1kxuMjjwdduxsEdTBOUL SvW3hSZPDk+6nab4JuqB3oV8gSsNYipOS/i++5i9jdwixPGjYnlc5wmmm2a/X85rN+V5KKet ddjg8VSx+GqXmT8zdBYbaxTMWBD9POPk7S2cX4ymZZ+U38O63jGQ/bBg/eXt245I8NRPZGbQ WtijxFKckWioxVxUnAgAhproI2QDAAA= DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140415_214349_054502_B742C68E X-CRM114-Status: GOOD ( 16.36 ) X-Spam-Score: -5.7 (-----) Cc: 'Kukjin Kim' , 'Arnd Bergmann' , 'Jingoo Han' , 'Liviu Dudau' , linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Samsung GH7 has four PCIe controllers which can be used as root complex for PCIe interface. Signed-off-by: Jingoo Han --- drivers/pci/host/Kconfig | 2 +- drivers/pci/host/pci-exynos.c | 135 ++++++++++++++++++++++++++++++++++++++--- 2 files changed, 126 insertions(+), 11 deletions(-) diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index a6f67ec..3be047c 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -11,7 +11,7 @@ config PCIE_DW config PCI_EXYNOS bool "Samsung Exynos PCIe controller" - depends on SOC_EXYNOS5440 + depends on SOC_EXYNOS5440 || ARCH_GH7 select PCIEPORTBUS select PCIE_DW diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c index 3de6bfb..6e845ca 100644 --- a/drivers/pci/host/pci-exynos.c +++ b/drivers/pci/host/pci-exynos.c @@ -57,6 +57,8 @@ struct exynos_pcie { #define PCIE_NONSTICKY_RESET 0x024 #define PCIE_APP_INIT_RESET 0x028 #define PCIE_APP_LTSSM_ENABLE 0x02c +#define PCIE_SYS_AUX_PWR_DET 0x038 +#define PCIE_SYS_AUX_PWR_ENABLE (0x1 << 0) #define PCIE_ELBI_RDLH_LINKUP 0x064 #define PCIE_ELBI_LTSSM_ENABLE 0x1 #define PCIE_ELBI_SLV_AWMISC 0x11c @@ -72,6 +74,23 @@ struct exynos_pcie { #define PCIE_PHY_TRSVREG_RESET 0x020 #define PCIE_PHY_TRSV_RESET 0x024 +/* PCIe PHY glue registers */ +#define PCIE_PHY_GLUE_REG0 0x000 +#define PCIE_PHY_GLUE_GLOBAL_RESET (0x1 << 0) +#define PCIE_PHY_GLUE_COMMON_RESET (0x1 << 1) +#define PCIE_PHY_GLUE_MAC_RESET (0x1 << 11) +#define PCIE_PHY_GLUE_REG2 0x008 +#define PCIE_PHY_GLUE_CLK100M_DS_MAX (0x7 << 0) +#define PCIE_PHY_GLUE_CLK100M_RFCLK (0x1 << 3) +#define PCIE_PHY_GLUE_CLK100M_ENABLE (0x1 << 4) +#define PCIE_PHY_GLUE_PLL_BUF_ENABLE (0x1 << 8) +#define PCIE_PHY_GLUE_PLL_DIV_ENABLE (0x1 << 9) +#define PCIE_PHY_GLUE_REFCLK_IN(x) (((x) & 0xf) << 10) +#define PCIE_PHY_GLUE_REG3 0x00c +#define PCIE_PHY_GLUE_REF_RATE_100MHZ (0x2 << 0) +#define PCIE_PHY_GLUE_REG4 0x010 +#define PCIE_PHY_GLUE_MODE_PCIE (0x0 << 0) + /* PCIe PHY registers */ #define PCIE_PHY_IMPEDANCE 0x004 #define PCIE_PHY_PLL_DIV_0 0x008 @@ -164,11 +183,45 @@ static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on) } } +static void exynos_pcie_set_phy_mode(struct pcie_port *pp) +{ + u32 val; + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); + + if (!of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) + return; + + /* configure phy reference clock setting */ + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG2); + val |= PCIE_PHY_GLUE_CLK100M_ENABLE | PCIE_PHY_GLUE_CLK100M_RFCLK | + PCIE_PHY_GLUE_CLK100M_DS_MAX; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG2); + + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG2); + val |= PCIE_PHY_GLUE_PLL_DIV_ENABLE | PCIE_PHY_GLUE_PLL_BUF_ENABLE; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG2); + + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG2); + val |= PCIE_PHY_GLUE_REFCLK_IN(6); + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG2); + + /* set phy reference clock */ + exynos_blk_writel(exynos_pcie, PCIE_PHY_GLUE_REF_RATE_100MHZ, + PCIE_PHY_GLUE_REG3); + + /* set phy mode to pcie mode */ + exynos_blk_writel(exynos_pcie, PCIE_PHY_GLUE_MODE_PCIE, + PCIE_PHY_GLUE_REG4); +} + static void exynos_pcie_assert_core_reset(struct pcie_port *pp) { u32 val; struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) + return; + val = exynos_elb_readl(exynos_pcie, PCIE_CORE_RESET); val &= ~PCIE_CORE_RESET_ENABLE; exynos_elb_writel(exynos_pcie, val, PCIE_CORE_RESET); @@ -190,27 +243,48 @@ static void exynos_pcie_deassert_core_reset(struct pcie_port *pp) exynos_elb_writel(exynos_pcie, 1, PCIE_NONSTICKY_RESET); exynos_elb_writel(exynos_pcie, 1, PCIE_APP_INIT_RESET); exynos_elb_writel(exynos_pcie, 0, PCIE_APP_INIT_RESET); - exynos_blk_writel(exynos_pcie, 1, PCIE_PHY_MAC_RESET); + + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) { + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG0); + val |= PCIE_PHY_GLUE_MAC_RESET; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG0); + } else { + exynos_blk_writel(exynos_pcie, 1, PCIE_PHY_MAC_RESET); + } } static void exynos_pcie_assert_phy_reset(struct pcie_port *pp) { struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) + return; + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_MAC_RESET); exynos_blk_writel(exynos_pcie, 1, PCIE_PHY_GLOBAL_RESET); } static void exynos_pcie_deassert_phy_reset(struct pcie_port *pp) { + u32 val; struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); - exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_GLOBAL_RESET); - exynos_elb_writel(exynos_pcie, 1, PCIE_PWR_RESET); - exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_COMMON_RESET); - exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_CMN_REG); - exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_TRSVREG_RESET); - exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_TRSV_RESET); + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) { + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG0); + val |= PCIE_PHY_GLUE_GLOBAL_RESET; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG0); + exynos_elb_writel(exynos_pcie, 1, PCIE_PWR_RESET); + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG0); + val |= PCIE_PHY_GLUE_COMMON_RESET; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG0); + } else { + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_GLOBAL_RESET); + exynos_elb_writel(exynos_pcie, 1, PCIE_PWR_RESET); + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_COMMON_RESET); + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_CMN_REG); + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_TRSVREG_RESET); + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_TRSV_RESET); + } } static void exynos_pcie_power_on_phy(struct pcie_port *pp) @@ -269,6 +343,9 @@ static void exynos_pcie_init_phy(struct pcie_port *pp) { struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) + return; + /* DCC feedback control off */ exynos_phy_writel(exynos_pcie, 0x29, PCIE_PHY_DCC_FEEDBACK); @@ -305,6 +382,26 @@ static void exynos_pcie_init_phy(struct pcie_port *pp) exynos_phy_writel(exynos_pcie, 0xa0, PCIE_PHY_TRSV3_LVCC); } +static void exynos_pcie_pulse_common_reset(struct pcie_port *pp) +{ + u32 val; + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); + + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) { + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG0); + val &= ~PCIE_PHY_GLUE_COMMON_RESET; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG0); + udelay(500); + val = exynos_blk_readl(exynos_pcie, PCIE_PHY_GLUE_REG0); + val |= PCIE_PHY_GLUE_COMMON_RESET; + exynos_blk_writel(exynos_pcie, val, PCIE_PHY_GLUE_REG0); + } else { + exynos_blk_writel(exynos_pcie, 1, PCIE_PHY_COMMON_RESET); + udelay(500); + exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_COMMON_RESET); + } +} + static void exynos_pcie_assert_reset(struct pcie_port *pp) { struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp); @@ -326,6 +423,9 @@ static int exynos_pcie_establish_link(struct pcie_port *pp) return 0; } + /* set phy mode */ + exynos_pcie_set_phy_mode(pp); + /* assert reset signals */ exynos_pcie_assert_core_reset(pp); exynos_pcie_assert_phy_reset(pp); @@ -340,9 +440,7 @@ static int exynos_pcie_establish_link(struct pcie_port *pp) exynos_pcie_init_phy(pp); /* pulse for common reset */ - exynos_blk_writel(exynos_pcie, 1, PCIE_PHY_COMMON_RESET); - udelay(500); - exynos_blk_writel(exynos_pcie, 0, PCIE_PHY_COMMON_RESET); + exynos_pcie_pulse_common_reset(pp); /* de-assert core reset */ exynos_pcie_deassert_core_reset(pp); @@ -357,6 +455,12 @@ static int exynos_pcie_establish_link(struct pcie_port *pp) exynos_elb_writel(exynos_pcie, PCIE_ELBI_LTSSM_ENABLE, PCIE_APP_LTSSM_ENABLE); + if (of_device_is_compatible(pp->dev->of_node, "samsung,gh7-pcie")) { + /* supply auxiliary power */ + exynos_elb_writel(exynos_pcie, PCIE_SYS_AUX_PWR_ENABLE, + PCIE_SYS_AUX_PWR_DET); + } + /* check if the link is up or not */ while (!dw_pcie_link_up(pp)) { mdelay(100); @@ -564,6 +668,7 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) struct resource *elbi_base; struct resource *phy_base; struct resource *block_base; + struct resource *dbi_base; int ret; exynos_pcie = devm_kzalloc(&pdev->dev, sizeof(*exynos_pcie), @@ -619,6 +724,15 @@ static int __init exynos_pcie_probe(struct platform_device *pdev) goto fail_bus_clk; } + if (of_device_is_compatible(pdev->dev.of_node, "samsung,gh7-pcie")) { + dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 3); + pp->dbi_base = devm_ioremap_resource(&pdev->dev, dbi_base); + if (IS_ERR(pp->dbi_base)) { + ret = PTR_ERR(pp->dbi_base); + goto fail_bus_clk; + } + } + ret = add_pcie_port(pp, pdev); if (ret < 0) goto fail_bus_clk; @@ -645,6 +759,7 @@ static int __exit exynos_pcie_remove(struct platform_device *pdev) static const struct of_device_id exynos_pcie_of_match[] = { { .compatible = "samsung,exynos5440-pcie", }, + { .compatible = "samsung,gh7-pcie", }, {}, }; MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);