>A driver for freescale 85xx platforms to access the Cache-Sram form>user >level. This is extremely helpful for some user-space applications >that require high performance memory accesses. > >Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> >Cc: Christophe Leroy <christophe.le...@c-s.fr> >Cc: Scott Wood <o...@buserror.net> >Cc: Michael Ellerman <m...@ellerman.id.au> >Cc: linuxppc-dev@lists.ozlabs.org >Reviewed-by: Christophe Leroy <christophe.le...@c-s.fr> >Signed-off-by: Wang Wenhu <wenhu.w...@vivo.com>
Hi, Christophe, I labeled you Reviewed comment. Regards, Wenhu >--- >Changes since v1: > * Addressed comments from Greg K-H > * Moved kfree(info->name) into uio_info_free_internal() >Changes since v2: > * Addressed comments from Greg, Scott and Christophe > * Use "uiomem->internal_addr" as if condition for sram memory free, > and memset the uiomem entry > * of_match_table modified to be apart from HW info which belong to > the HW level driver fsl_85xx_cache_sram to match > * Use roundup_pow_of_two for align calc > * Remove useless clear block of uiomem entries. > * Use UIO_INFO_VER micro for info->version, and define it as > "devicetree,pseudo", meaning this is pseudo device and probed from > device tree configuration >Changes since v3: > * Addressed comments from Christophe(use devm_xxx memory alloc interfaces) >Changes since v4: > * Use module_param_string for of_match_table, no binding to devicetree >--- > drivers/uio/Kconfig | 9 ++ > drivers/uio/Makefile | 1 + > drivers/uio/uio_fsl_85xx_cache_sram.c | 154 ++++++++++++++++++++++++++ > 3 files changed, 164 insertions(+) > create mode 100644 drivers/uio/uio_fsl_85xx_cache_sram.c > >diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig >index 202ee81cfc2b..9c3b47461b71 100644 >--- a/drivers/uio/Kconfig >+++ b/drivers/uio/Kconfig >@@ -105,6 +105,15 @@ config UIO_NETX > To compile this driver as a module, choose M here; the module > will be called uio_netx. > >+config UIO_FSL_85XX_CACHE_SRAM >+ tristate "Freescale 85xx Cache-Sram driver" >+ depends on FSL_SOC_BOOKE && PPC32 >+ select FSL_85XX_CACHE_SRAM >+ help >+ Generic driver for accessing the Cache-Sram form user level. This >+ is extremely helpful for some user-space applications that require >+ high performance memory accesses. >+ > config UIO_FSL_ELBC_GPCM > tristate "eLBC/GPCM driver" > depends on FSL_LBC >diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile >index c285dd2a4539..be2056cffc21 100644 >--- a/drivers/uio/Makefile >+++ b/drivers/uio/Makefile >@@ -10,4 +10,5 @@ obj-$(CONFIG_UIO_NETX) += uio_netx.o > obj-$(CONFIG_UIO_PRUSS) += uio_pruss.o > obj-$(CONFIG_UIO_MF624) += uio_mf624.o > obj-$(CONFIG_UIO_FSL_ELBC_GPCM) += uio_fsl_elbc_gpcm.o >+obj-$(CONFIG_UIO_FSL_85XX_CACHE_SRAM) += uio_fsl_85xx_cache_sram.o > obj-$(CONFIG_UIO_HV_GENERIC) += uio_hv_generic.o >diff --git a/drivers/uio/uio_fsl_85xx_cache_sram.c >b/drivers/uio/uio_fsl_85xx_cache_sram.c >new file mode 100644 >index 000000000000..4db3648629b3 >--- /dev/null >+++ b/drivers/uio/uio_fsl_85xx_cache_sram.c >@@ -0,0 +1,154 @@ >+// SPDX-License-Identifier: GPL-2.0 >+/* >+ * Copyright (C) 2020 Vivo Communication Technology Co. Ltd. >+ * Copyright (C) 2020 Wang Wenhu <wenhu.w...@vivo.com> >+ * All rights reserved. >+ */ >+ >+#include <linux/platform_device.h> >+#include <linux/uio_driver.h> >+#include <linux/stringify.h> >+#include <linux/module.h> >+#include <linux/kernel.h> >+#include <asm/fsl_85xx_cache_sram.h> >+ >+#define DRIVER_NAME "uio_fsl_85xx_cache_sram" >+#define UIO_INFO_VER "devicetree,pseudo" >+#define UIO_NAME "uio_cache_sram" >+ >+static void uio_info_free_internal(struct uio_info *info) >+{ >+ int i; >+ >+ for (i = 0; i < MAX_UIO_MAPS; i++) { >+ struct uio_mem *uiomem = &info->mem[i]; >+ >+ if (uiomem->internal_addr) { >+ mpc85xx_cache_sram_free(uiomem->internal_addr); >+ memset(uiomem, 0, sizeof(*uiomem)); >+ } >+ } >+} >+ >+static int uio_fsl_85xx_cache_sram_probe(struct platform_device *pdev) >+{ >+ struct device_node *parent = pdev->dev.of_node; >+ struct device_node *node = NULL; >+ struct uio_info *info; >+ struct uio_mem *uiomem; >+ const char *dt_name; >+ u32 mem_size; >+ int ret; >+ >+ /* alloc uio_info for one device */ >+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); >+ if (!info) >+ return -ENOMEM; >+ >+ /* get optional uio name */ >+ if (of_property_read_string(parent, "uio_name", &dt_name)) >+ dt_name = UIO_NAME; >+ >+ info->name = devm_kstrdup(&pdev->dev, dt_name, GFP_KERNEL); >+ if (!info->name) >+ return -ENOMEM; >+ >+ uiomem = info->mem; >+ for_each_child_of_node(parent, node) { >+ void *virt; >+ phys_addr_t phys; >+ >+ ret = of_property_read_u32(node, "cache-mem-size", &mem_size); >+ if (ret) { >+ ret = -EINVAL; >+ goto err_out; >+ } >+ >+ if (mem_size == 0) { >+ dev_err(&pdev->dev, "error cache-mem-size should not be >0\n"); >+ ret = -EINVAL; >+ goto err_out; >+ } >+ >+ virt = mpc85xx_cache_sram_alloc(mem_size, &phys, >+ roundup_pow_of_two(mem_size)); >+ if (!virt) { >+ /* mpc85xx_cache_sram_alloc to define the real cause */ >+ ret = -ENOMEM; >+ goto err_out; >+ } >+ >+ uiomem->memtype = UIO_MEM_PHYS; >+ uiomem->addr = phys; >+ uiomem->size = mem_size; >+ uiomem->name = kstrdup(node->name, GFP_KERNEL); >+ uiomem->internal_addr = virt; >+ uiomem++; >+ >+ if (uiomem >= &info->mem[MAX_UIO_MAPS]) { >+ dev_warn(&pdev->dev, "more than %d uio-maps for >device.\n", >+ MAX_UIO_MAPS); >+ break; >+ } >+ } >+ >+ if (uiomem == info->mem) { >+ dev_err(&pdev->dev, "error no valid uio-map configuration >found\n"); >+ return -EINVAL; >+ } >+ >+ info->version = UIO_INFO_VER; >+ >+ /* register uio device */ >+ if (uio_register_device(&pdev->dev, info)) { >+ dev_err(&pdev->dev, "error uio,cache-sram registration >failed\n"); >+ ret = -ENODEV; >+ goto err_out; >+ } >+ >+ platform_set_drvdata(pdev, info); >+ >+ return 0; >+err_out: >+ uio_info_free_internal(info); >+ return ret; >+} >+ >+static int uio_fsl_85xx_cache_sram_remove(struct platform_device *pdev) >+{ >+ struct uio_info *info = platform_get_drvdata(pdev); >+ >+ uio_unregister_device(info); >+ >+ uio_info_free_internal(info); >+ >+ return 0; >+} >+ >+#ifdef CONFIG_OF >+static struct of_device_id uio_fsl_85xx_cache_sram_of_match[] = { >+ { /* This is filled with module_parm */ }, >+ { /* Sentinel */ }, >+}; >+MODULE_DEVICE_TABLE(of, uio_fsl_85xx_cache_sram_of_match); >+ >+module_param_string(of_id, uio_fsl_85xx_cache_sram_of_match[0].compatible, >+ sizeof(uio_fsl_85xx_cache_sram_of_match[0].compatible), 0); >+MODULE_PARM_DESC(of_id, "platform device id to be handled by cache-sram-uio"); >+#endif >+ >+static struct platform_driver uio_fsl_85xx_cache_sram = { >+ .probe = uio_fsl_85xx_cache_sram_probe, >+ .remove = uio_fsl_85xx_cache_sram_remove, >+ .driver = { >+ .name = DRIVER_NAME, >+ .of_match_table = >of_match_ptr(uio_fsl_85xx_cache_sram_of_match), >+ }, >+}; >+ >+module_platform_driver(uio_fsl_85xx_cache_sram); >+ >+MODULE_AUTHOR("Wang Wenhu <wenhu.w...@vivo.com>"); >+MODULE_DESCRIPTION("Freescale MPC85xx Cache-Sram UIO Platform Driver"); >+MODULE_ALIAS("platform:" DRIVER_NAME); >+MODULE_LICENSE("GPL v2"); >-- >2.17.1 >