diff options
Diffstat (limited to 'drivers/video/fbdev/simplefb.c')
| -rw-r--r-- | drivers/video/fbdev/simplefb.c | 155 |
1 files changed, 139 insertions, 16 deletions
diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c index 10d71879d340..92595af022eb 100644 --- a/drivers/video/fbdev/simplefb.c +++ b/drivers/video/fbdev/simplefb.c @@ -13,17 +13,19 @@ */ #include <linux/aperture.h> +#include <linux/clk.h> #include <linux/errno.h> #include <linux/fb.h> #include <linux/io.h> #include <linux/module.h> -#include <linux/platform_data/simplefb.h> -#include <linux/platform_device.h> -#include <linux/clk.h> #include <linux/of.h> #include <linux/of_clk.h> #include <linux/of_platform.h> +#include <linux/of_reserved_mem.h> #include <linux/parser.h> +#include <linux/platform_data/simplefb.h> +#include <linux/platform_device.h> +#include <linux/pm_domain.h> #include <linux/regulator/consumer.h> static const struct fb_fix_screeninfo simplefb_fix = { @@ -77,6 +79,11 @@ struct simplefb_par { unsigned int clk_count; struct clk **clks; #endif +#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS + unsigned int num_genpds; + struct device **genpds; + struct device_link **genpd_links; +#endif #if defined CONFIG_OF && defined CONFIG_REGULATOR bool regulators_enabled; u32 regulator_count; @@ -86,6 +93,7 @@ struct simplefb_par { static void simplefb_clocks_destroy(struct simplefb_par *par); static void simplefb_regulators_destroy(struct simplefb_par *par); +static void simplefb_detach_genpds(void *res); /* * fb_ops.fb_destroy is called by the last put_fb_info() call at the end @@ -98,6 +106,7 @@ static void simplefb_destroy(struct fb_info *info) simplefb_regulators_destroy(info->par); simplefb_clocks_destroy(info->par); + simplefb_detach_genpds(info->par); if (info->screen_base) iounmap(info->screen_base); @@ -109,11 +118,9 @@ static void simplefb_destroy(struct fb_info *info) static const struct fb_ops simplefb_ops = { .owner = THIS_MODULE, + FB_DEFAULT_IOMEM_OPS, .fb_destroy = simplefb_destroy, .fb_setcolreg = simplefb_setcolreg, - .fb_fillrect = cfb_fillrect, - .fb_copyarea = cfb_copyarea, - .fb_imageblit = cfb_imageblit, }; static struct simplefb_format simplefb_formats[] = SIMPLEFB_FORMATS; @@ -123,6 +130,7 @@ struct simplefb_params { u32 height; u32 stride; struct simplefb_format *format; + struct resource memory; }; static int simplefb_parse_dt(struct platform_device *pdev, @@ -168,6 +176,14 @@ static int simplefb_parse_dt(struct platform_device *pdev, return -EINVAL; } + ret = of_reserved_mem_region_to_resource(np, 0, ¶ms->memory); + if (!ret) { + if (of_property_present(np, "reg")) + dev_warn(&pdev->dev, "preferring \"memory-region\" over \"reg\" property\n"); + } else { + memset(¶ms->memory, 0, sizeof(params->memory)); + } + return 0; } @@ -195,6 +211,8 @@ static int simplefb_parse_pd(struct platform_device *pdev, return -EINVAL; } + memset(¶ms->memory, 0, sizeof(params->memory)); + return 0; } @@ -413,6 +431,104 @@ static void simplefb_regulators_enable(struct simplefb_par *par, static void simplefb_regulators_destroy(struct simplefb_par *par) { } #endif +#if defined CONFIG_OF && defined CONFIG_PM_GENERIC_DOMAINS +static void simplefb_detach_genpds(void *res) +{ + struct simplefb_par *par = res; + unsigned int i = par->num_genpds; + + if (par->num_genpds <= 1) + return; + + while (i--) { + if (par->genpd_links[i]) + device_link_del(par->genpd_links[i]); + + if (!IS_ERR_OR_NULL(par->genpds[i])) + dev_pm_domain_detach(par->genpds[i], true); + } + par->num_genpds = 0; +} + +static int simplefb_attach_genpds(struct simplefb_par *par, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + unsigned int i, num_genpds; + int err; + + err = of_count_phandle_with_args(dev->of_node, "power-domains", + "#power-domain-cells"); + if (err < 0) { + /* Nothing wrong if optional PDs are missing */ + if (err == -ENOENT) + return 0; + + dev_err(dev, "failed to parse power-domains: %d\n", err); + return err; + } + + num_genpds = err; + + /* + * Single power-domain devices are handled by the driver core, so + * nothing to do here. + */ + if (num_genpds <= 1) { + par->num_genpds = num_genpds; + return 0; + } + + par->genpds = devm_kcalloc(dev, num_genpds, sizeof(*par->genpds), + GFP_KERNEL); + if (!par->genpds) + return -ENOMEM; + + par->genpd_links = devm_kcalloc(dev, num_genpds, + sizeof(*par->genpd_links), + GFP_KERNEL); + if (!par->genpd_links) + return -ENOMEM; + + /* + * Set par->num_genpds only after genpds and genpd_links are allocated + * to exit early from simplefb_detach_genpds() without full + * initialisation. + */ + par->num_genpds = num_genpds; + + for (i = 0; i < par->num_genpds; i++) { + par->genpds[i] = dev_pm_domain_attach_by_id(dev, i); + if (IS_ERR(par->genpds[i])) { + err = PTR_ERR(par->genpds[i]); + if (err == -EPROBE_DEFER) { + simplefb_detach_genpds(par); + return err; + } + + dev_warn(dev, "failed to attach domain %u: %d\n", i, err); + continue; + } + + par->genpd_links[i] = device_link_add(dev, par->genpds[i], + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + if (!par->genpd_links[i]) + dev_warn(dev, "failed to link power-domain %u\n", i); + } + + return 0; +} +#else +static void simplefb_detach_genpds(void *res) { } +static int simplefb_attach_genpds(struct simplefb_par *par, + struct platform_device *pdev) +{ + return 0; +} +#endif + static int simplefb_probe(struct platform_device *pdev) { int ret; @@ -433,10 +549,14 @@ static int simplefb_probe(struct platform_device *pdev) if (ret) return ret; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "No memory resource\n"); - return -EINVAL; + if (params.memory.start == 0 && params.memory.end == 0) { + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "No memory resource\n"); + return -EINVAL; + } + } else { + res = ¶ms.memory; } mem = request_mem_region(res->start, resource_size(res), "simplefb"); @@ -479,7 +599,6 @@ static int simplefb_probe(struct platform_device *pdev) par->size = info->fix.smem_len; info->fbops = &simplefb_ops; - info->flags = FBINFO_DEFAULT; info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len); if (!info->screen_base) { @@ -496,6 +615,10 @@ static int simplefb_probe(struct platform_device *pdev) if (ret < 0) goto error_clocks; + ret = simplefb_attach_genpds(par, pdev); + if (ret < 0) + goto error_regulators; + simplefb_clocks_enable(par, pdev); simplefb_regulators_enable(par, pdev); @@ -512,18 +635,20 @@ static int simplefb_probe(struct platform_device *pdev) ret = devm_aperture_acquire_for_platform_device(pdev, par->base, par->size); if (ret) { dev_err(&pdev->dev, "Unable to acquire aperture: %d\n", ret); - goto error_regulators; + goto error_genpds; } ret = register_framebuffer(info); if (ret < 0) { dev_err(&pdev->dev, "Unable to register simplefb: %d\n", ret); - goto error_regulators; + goto error_genpds; } dev_info(&pdev->dev, "fb%d: simplefb registered!\n", info->node); return 0; +error_genpds: + simplefb_detach_genpds(par); error_regulators: simplefb_regulators_destroy(par); error_clocks: @@ -538,14 +663,12 @@ error_release_mem_region: return ret; } -static int simplefb_remove(struct platform_device *pdev) +static void simplefb_remove(struct platform_device *pdev) { struct fb_info *info = platform_get_drvdata(pdev); /* simplefb_destroy takes care of info cleanup */ unregister_framebuffer(info); - - return 0; } static const struct of_device_id simplefb_of_match[] = { |