diff options
Diffstat (limited to 'target/linux/ipq806x/patches/0114-ahci-platform-Library-ise-ahci_probe-functionality.patch')
| -rw-r--r-- | target/linux/ipq806x/patches/0114-ahci-platform-Library-ise-ahci_probe-functionality.patch | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches/0114-ahci-platform-Library-ise-ahci_probe-functionality.patch b/target/linux/ipq806x/patches/0114-ahci-platform-Library-ise-ahci_probe-functionality.patch new file mode 100644 index 0000000000..9b9c7afd47 --- /dev/null +++ b/target/linux/ipq806x/patches/0114-ahci-platform-Library-ise-ahci_probe-functionality.patch @@ -0,0 +1,341 @@ +From 8be4987340a101253fb871556894a002f1afb51f Mon Sep 17 00:00:00 2001 +From: Hans de Goede <hdegoede@redhat.com> +Date: Sat, 22 Feb 2014 16:53:34 +0100 +Subject: [PATCH 114/182] ahci-platform: "Library-ise" ahci_probe + functionality + +ahci_probe consists of 3 steps: +1) Get resources (get mmio, clks, regulator) +2) Enable resources, handled by ahci_platform_enable_resouces +3) The more or less standard ahci-host controller init sequence + +This commit refactors step 1 and 3 into separate functions, so the platform +drivers for AHCI implementations which need a specific order in step 2, +and / or need to do some custom register poking at some time, can re-use +ahci-platform.c code without needing to copy and paste it. + +Note that ahci_platform_init_host's prototype takes the 3 non function +members of ahci_platform_data as arguments, the idea is that drivers using +the new exported utility functions will not use ahci_platform_data at all, +and hopefully in the future ahci_platform_data can go away entirely. + +tj: Minor comment formatting updates. + +Signed-off-by: Hans de Goede <hdegoede@redhat.com> +Signed-off-by: Tejun Heo <tj@kernel.org> +--- + drivers/ata/ahci_platform.c | 188 +++++++++++++++++++++++++++-------------- + include/linux/ahci_platform.h | 14 +++ + 2 files changed, 137 insertions(+), 65 deletions(-) + +diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c +index a32df31..19e9eaa 100644 +--- a/drivers/ata/ahci_platform.c ++++ b/drivers/ata/ahci_platform.c +@@ -188,64 +188,60 @@ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) + } + EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); + +-static void ahci_put_clks(struct ahci_host_priv *hpriv) ++static void ahci_platform_put_resources(struct device *dev, void *res) + { ++ struct ahci_host_priv *hpriv = res; + int c; + + for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) + clk_put(hpriv->clks[c]); + } + +-static int ahci_probe(struct platform_device *pdev) ++/** ++ * ahci_platform_get_resources - Get platform resources ++ * @pdev: platform device to get resources for ++ * ++ * This function allocates an ahci_host_priv struct, and gets the following ++ * resources, storing a reference to them inside the returned struct: ++ * ++ * 1) mmio registers (IORESOURCE_MEM 0, mandatory) ++ * 2) regulator for controlling the targets power (optional) ++ * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, ++ * or for non devicetree enabled platforms a single clock ++ * ++ * RETURNS: ++ * The allocated ahci_host_priv on success, otherwise an ERR_PTR value ++ */ ++struct ahci_host_priv *ahci_platform_get_resources( ++ struct platform_device *pdev) + { + struct device *dev = &pdev->dev; +- struct ahci_platform_data *pdata = dev_get_platdata(dev); +- const struct platform_device_id *id = platform_get_device_id(pdev); +- struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0]; +- const struct ata_port_info *ppi[] = { &pi, NULL }; + struct ahci_host_priv *hpriv; +- struct ata_host *host; +- struct resource *mem; + struct clk *clk; +- int irq; +- int n_ports; +- int i; +- int rc; ++ int i, rc = -ENOMEM; + +- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); +- if (!mem) { +- dev_err(dev, "no mmio space\n"); +- return -EINVAL; +- } +- +- irq = platform_get_irq(pdev, 0); +- if (irq <= 0) { +- dev_err(dev, "no irq\n"); +- return -EINVAL; +- } ++ if (!devres_open_group(dev, NULL, GFP_KERNEL)) ++ return ERR_PTR(-ENOMEM); + +- if (pdata && pdata->ata_port_info) +- pi = *pdata->ata_port_info; +- +- hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); +- if (!hpriv) { +- dev_err(dev, "can't alloc ahci_host_priv\n"); +- return -ENOMEM; +- } ++ hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), ++ GFP_KERNEL); ++ if (!hpriv) ++ goto err_out; + +- hpriv->flags |= (unsigned long)pi.private_data; ++ devres_add(dev, hpriv); + +- hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem)); ++ hpriv->mmio = devm_ioremap_resource(dev, ++ platform_get_resource(pdev, IORESOURCE_MEM, 0)); + if (!hpriv->mmio) { +- dev_err(dev, "can't map %pR\n", mem); +- return -ENOMEM; ++ dev_err(dev, "no mmio space\n"); ++ goto err_out; + } + + hpriv->target_pwr = devm_regulator_get_optional(dev, "target"); + if (IS_ERR(hpriv->target_pwr)) { + rc = PTR_ERR(hpriv->target_pwr); + if (rc == -EPROBE_DEFER) +- return -EPROBE_DEFER; ++ goto err_out; + hpriv->target_pwr = NULL; + } + +@@ -264,33 +260,59 @@ static int ahci_probe(struct platform_device *pdev) + if (IS_ERR(clk)) { + rc = PTR_ERR(clk); + if (rc == -EPROBE_DEFER) +- goto free_clk; ++ goto err_out; + break; + } + hpriv->clks[i] = clk; + } + +- rc = ahci_platform_enable_resources(hpriv); +- if (rc) +- goto free_clk; ++ devres_remove_group(dev, NULL); ++ return hpriv; + +- /* +- * Some platforms might need to prepare for mmio region access, +- * which could be done in the following init call. So, the mmio +- * region shouldn't be accessed before init (if provided) has +- * returned successfully. +- */ +- if (pdata && pdata->init) { +- rc = pdata->init(dev, hpriv->mmio); +- if (rc) +- goto disable_resources; +- } ++err_out: ++ devres_release_group(dev, NULL); ++ return ERR_PTR(rc); ++} ++EXPORT_SYMBOL_GPL(ahci_platform_get_resources); ++ ++/** ++ * ahci_platform_init_host - Bring up an ahci-platform host ++ * @pdev: platform device pointer for the host ++ * @hpriv: ahci-host private data for the host ++ * @pi_template: template for the ata_port_info to use ++ * @force_port_map: param passed to ahci_save_initial_config ++ * @mask_port_map: param passed to ahci_save_initial_config ++ * ++ * This function does all the usual steps needed to bring up an ++ * ahci-platform host, note any necessary resources (ie clks, phy, etc.) ++ * must be initialized / enabled before calling this. ++ * ++ * RETURNS: ++ * 0 on success otherwise a negative error code ++ */ ++int ahci_platform_init_host(struct platform_device *pdev, ++ struct ahci_host_priv *hpriv, ++ const struct ata_port_info *pi_template, ++ unsigned int force_port_map, ++ unsigned int mask_port_map) ++{ ++ struct device *dev = &pdev->dev; ++ struct ata_port_info pi = *pi_template; ++ const struct ata_port_info *ppi[] = { &pi, NULL }; ++ struct ata_host *host; ++ int i, irq, n_ports, rc; + +- ahci_save_initial_config(dev, hpriv, +- pdata ? pdata->force_port_map : 0, +- pdata ? pdata->mask_port_map : 0); ++ irq = platform_get_irq(pdev, 0); ++ if (irq <= 0) { ++ dev_err(dev, "no irq\n"); ++ return -EINVAL; ++ } + + /* prepare host */ ++ hpriv->flags |= (unsigned long)pi.private_data; ++ ++ ahci_save_initial_config(dev, hpriv, force_port_map, mask_port_map); ++ + if (hpriv->cap & HOST_CAP_NCQ) + pi.flags |= ATA_FLAG_NCQ; + +@@ -307,10 +329,8 @@ static int ahci_probe(struct platform_device *pdev) + n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); + + host = ata_host_alloc_pinfo(dev, ppi, n_ports); +- if (!host) { +- rc = -ENOMEM; +- goto pdata_exit; +- } ++ if (!host) ++ return -ENOMEM; + + host->private_data = hpriv; + +@@ -325,7 +345,8 @@ static int ahci_probe(struct platform_device *pdev) + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + +- ata_port_desc(ap, "mmio %pR", mem); ++ ata_port_desc(ap, "mmio %pR", ++ platform_get_resource(pdev, IORESOURCE_MEM, 0)); + ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); + + /* set enclosure management message type */ +@@ -339,13 +360,53 @@ static int ahci_probe(struct platform_device *pdev) + + rc = ahci_reset_controller(host); + if (rc) +- goto pdata_exit; ++ return rc; + + ahci_init_controller(host); + ahci_print_info(host, "platform"); + +- rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED, +- &ahci_platform_sht); ++ return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED, ++ &ahci_platform_sht); ++} ++EXPORT_SYMBOL_GPL(ahci_platform_init_host); ++ ++static int ahci_probe(struct platform_device *pdev) ++{ ++ struct device *dev = &pdev->dev; ++ struct ahci_platform_data *pdata = dev_get_platdata(dev); ++ const struct platform_device_id *id = platform_get_device_id(pdev); ++ const struct ata_port_info *pi_template; ++ struct ahci_host_priv *hpriv; ++ int rc; ++ ++ hpriv = ahci_platform_get_resources(pdev); ++ if (IS_ERR(hpriv)) ++ return PTR_ERR(hpriv); ++ ++ rc = ahci_platform_enable_resources(hpriv); ++ if (rc) ++ return rc; ++ ++ /* ++ * Some platforms might need to prepare for mmio region access, ++ * which could be done in the following init call. So, the mmio ++ * region shouldn't be accessed before init (if provided) has ++ * returned successfully. ++ */ ++ if (pdata && pdata->init) { ++ rc = pdata->init(dev, hpriv->mmio); ++ if (rc) ++ goto disable_resources; ++ } ++ ++ if (pdata && pdata->ata_port_info) ++ pi_template = pdata->ata_port_info; ++ else ++ pi_template = &ahci_port_info[id ? id->driver_data : 0]; ++ ++ rc = ahci_platform_init_host(pdev, hpriv, pi_template, ++ pdata ? pdata->force_port_map : 0, ++ pdata ? pdata->mask_port_map : 0); + if (rc) + goto pdata_exit; + +@@ -355,8 +416,6 @@ pdata_exit: + pdata->exit(dev); + disable_resources: + ahci_platform_disable_resources(hpriv); +-free_clk: +- ahci_put_clks(hpriv); + return rc; + } + +@@ -370,7 +429,6 @@ static void ahci_host_stop(struct ata_host *host) + pdata->exit(dev); + + ahci_platform_disable_resources(hpriv); +- ahci_put_clks(hpriv); + } + + #ifdef CONFIG_PM_SLEEP +diff --git a/include/linux/ahci_platform.h b/include/linux/ahci_platform.h +index b674b01..b80c51c 100644 +--- a/include/linux/ahci_platform.h ++++ b/include/linux/ahci_platform.h +@@ -20,7 +20,14 @@ + struct device; + struct ata_port_info; + struct ahci_host_priv; ++struct platform_device; + ++/* ++ * Note ahci_platform_data is deprecated, it is only kept around for use ++ * by the old da850 and spear13xx ahci code. ++ * New drivers should instead declare their own platform_driver struct, and ++ * use ahci_platform* functions in their own probe, suspend and resume methods. ++ */ + struct ahci_platform_data { + int (*init)(struct device *dev, void __iomem *addr); + void (*exit)(struct device *dev); +@@ -35,5 +42,12 @@ int ahci_platform_enable_clks(struct ahci_host_priv *hpriv); + void ahci_platform_disable_clks(struct ahci_host_priv *hpriv); + int ahci_platform_enable_resources(struct ahci_host_priv *hpriv); + void ahci_platform_disable_resources(struct ahci_host_priv *hpriv); ++struct ahci_host_priv *ahci_platform_get_resources( ++ struct platform_device *pdev); ++int ahci_platform_init_host(struct platform_device *pdev, ++ struct ahci_host_priv *hpriv, ++ const struct ata_port_info *pi_template, ++ unsigned int force_port_map, ++ unsigned int mask_port_map); + + #endif /* _AHCI_PLATFORM_H */ +-- +1.7.10.4 + |