From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> I/O Coherence Port (IOCP) provides an AXI interface for connecting external non-caching masters, such as DMA controllers. The accesses from IOCP are coherent with D-Caches and L2 Cache. IOCP is a specification option and is disabled on the Renesas RZ/Five SoC due to this reason IP blocks using DMA will fail. The Andes AX45MP core has a Programmable Physical Memory Attributes (PMA) block that allows dynamic adjustment of memory attributes in the runtime. It contains a configurable amount of PMA entries implemented as CSR registers to control the attributes of memory locations in interest. Below are the memory attributes supported: * Device, Non-bufferable * Device, bufferable * Memory, Non-cacheable, Non-bufferable * Memory, Non-cacheable, Bufferable * Memory, Write-back, No-allocate * Memory, Write-back, Read-allocate * Memory, Write-back, Write-allocate * Memory, Write-back, Read and Write-allocate More info about PMA (section 10.3): Link: http://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.0.0-Datasheet.pdf As a workaround for SoCs with IOCP disabled CMO needs to be handled by software. Firstly OpenSBI configures the memory region as "Memory, Non-cacheable, Bufferable" and passes this region as a global shared dma pool as a DT node. With DMA_GLOBAL_POOL enabled all DMA allocations happen from this region and synchronization callbacks are implemented to synchronize when doing DMA transactions. Example PMA region passes as a DT node from OpenSBI: reserved-memory { #address-cells = <2>; #size-cells = <2>; ranges; pma_resv0@58000000 { compatible = "shared-dma-pool"; reg = <0x0 0x58000000 0x0 0x08000000>; no-map; linux,dma-default; }; }; Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> --- v4 -> v5 * Dropped code for configuring L2 cache * Dropped code for configuring PMA * Updated commit message * Added comments * Changed static branch enable/disable order RFC v3 -> v4 * Made use of runtime patching instead of compile time * Now just exposing single function ax45mp_no_iocp_cmo() for CMO handling * Added a check to make sure cache line size is always 64 bytes * Renamed folder rzf -> rzfive * Improved Kconfig description * Dropped L2 cache configuration * Dropped unnecessary casts * Fixed comments pointed by Geert. --- arch/riscv/include/asm/cacheflush.h | 8 + arch/riscv/include/asm/errata_list.h | 28 ++- drivers/soc/renesas/Kconfig | 6 + drivers/soc/renesas/Makefile | 2 + drivers/soc/renesas/rzfive/Kconfig | 6 + drivers/soc/renesas/rzfive/Makefile | 3 + drivers/soc/renesas/rzfive/ax45mp_cache.c | 256 ++++++++++++++++++++++ 7 files changed, 303 insertions(+), 6 deletions(-) create mode 100644 drivers/soc/renesas/rzfive/Kconfig create mode 100644 drivers/soc/renesas/rzfive/Makefile create mode 100644 drivers/soc/renesas/rzfive/ax45mp_cache.c diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h index e22019668b9e..d0e15636866c 100644 --- a/arch/riscv/include/asm/cacheflush.h +++ b/arch/riscv/include/asm/cacheflush.h @@ -68,6 +68,14 @@ static inline void riscv_noncoherent_supported(void) {} #define SYS_RISCV_FLUSH_ICACHE_LOCAL 1UL #define SYS_RISCV_FLUSH_ICACHE_ALL (SYS_RISCV_FLUSH_ICACHE_LOCAL) +#ifdef CONFIG_AX45MP_L2_CACHE +extern asmlinkage void ax45mp_no_iocp_cmo(unsigned int cache_size, void *vaddr, + size_t size, int dir, int ops); +#else +static inline void ax45mp_no_iocp_cmo(unsigned int cache_size, void *vaddr, + size_t size, int dir, int ops) {} +#endif + #include <asm-generic/cacheflush.h> #endif /* _ASM_RISCV_CACHEFLUSH_H */ diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h index 48e899a8e7a9..9a017142e67f 100644 --- a/arch/riscv/include/asm/errata_list.h +++ b/arch/riscv/include/asm/errata_list.h @@ -125,8 +125,8 @@ asm volatile(ALTERNATIVE( \ #define THEAD_SYNC_S ".long 0x0190000b" #define ALT_CMO_OP(_op, _start, _size, _cachesize, _dir, _ops) \ -asm volatile(ALTERNATIVE_2( \ - __nops(6), \ +asm volatile(ALTERNATIVE_3( \ + __nops(14), \ "mv a0, %1\n\t" \ "j 2f\n\t" \ "3:\n\t" \ @@ -134,7 +134,7 @@ asm volatile(ALTERNATIVE_2( \ "add a0, a0, %0\n\t" \ "2:\n\t" \ "bltu a0, %2, 3b\n\t" \ - "nop", 0, CPUFEATURE_ZICBOM, CONFIG_RISCV_ISA_ZICBOM, \ + __nops(9), 0, CPUFEATURE_ZICBOM, CONFIG_RISCV_ISA_ZICBOM, \ "mv a0, %1\n\t" \ "j 2f\n\t" \ "3:\n\t" \ @@ -142,8 +142,24 @@ asm volatile(ALTERNATIVE_2( \ "add a0, a0, %0\n\t" \ "2:\n\t" \ "bltu a0, %2, 3b\n\t" \ - THEAD_SYNC_S, THEAD_VENDOR_ID, \ - ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO) \ + THEAD_SYNC_S "\n\t" \ + __nops(8), THEAD_VENDOR_ID, \ + ERRATA_THEAD_CMO, CONFIG_ERRATA_THEAD_CMO, \ + "addi sp,sp,-16\n\t" \ + "sd s0,0(sp)\n\t" \ + "sd ra,8(sp)\n\t" \ + "addi s0,sp,16\n\t" \ + "mv a4,%6\n\t" \ + "mv a3,%5\n\t" \ + "mv a2,%4\n\t" \ + "mv a1,%3\n\t" \ + "mv a0,%0\n\t" \ + "call ax45mp_no_iocp_cmo\n\t" \ + "ld ra,8(sp)\n\t" \ + "ld s0,0(sp)\n\t" \ + "addi sp,sp,16\n\t", \ + ANDESTECH_VENDOR_ID, ERRATA_ANDESTECH_NO_IOCP, \ + CONFIG_ERRATA_ANDES_CMO) \ : : "r"(_cachesize), \ "r"((unsigned long)(_start) & ~((_cachesize) - 1UL)), \ "r"((unsigned long)(_start) + (_size)), \ @@ -151,7 +167,7 @@ asm volatile(ALTERNATIVE_2( \ "r"((unsigned long)(_size)), \ "r"((unsigned long)(_dir)), \ "r"((unsigned long)(_ops)) \ - : "a0") + : "a0", "a1", "a2", "a3", "a4", "memory") #define THEAD_C9XX_RV_IRQ_PMU 17 #define THEAD_C9XX_CSR_SCOUNTEROF 0x5c5 diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig index 660498252ec5..a6627936b79e 100644 --- a/drivers/soc/renesas/Kconfig +++ b/drivers/soc/renesas/Kconfig @@ -340,9 +340,15 @@ if RISCV config ARCH_R9A07G043 bool "RISC-V Platform support for RZ/Five" select ARCH_RZG2L + select AX45MP_L2_CACHE + select DMA_GLOBAL_POOL + select ERRATA_ANDES + select ERRATA_ANDES_CMO help This enables support for the Renesas RZ/Five SoC. +source "drivers/soc/renesas/rzfive/Kconfig" + endif # RISCV config RST_RCAR diff --git a/drivers/soc/renesas/Makefile b/drivers/soc/renesas/Makefile index 535868c9c7e4..9df9f759a039 100644 --- a/drivers/soc/renesas/Makefile +++ b/drivers/soc/renesas/Makefile @@ -31,6 +31,8 @@ ifdef CONFIG_SMP obj-$(CONFIG_ARCH_R9A06G032) += r9a06g032-smp.o endif +obj-$(CONFIG_RISCV) += rzfive/ + # Family obj-$(CONFIG_RST_RCAR) += rcar-rst.o obj-$(CONFIG_SYSC_RCAR) += rcar-sysc.o diff --git a/drivers/soc/renesas/rzfive/Kconfig b/drivers/soc/renesas/rzfive/Kconfig new file mode 100644 index 000000000000..b6bc00337d99 --- /dev/null +++ b/drivers/soc/renesas/rzfive/Kconfig @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 + +config AX45MP_L2_CACHE + bool "Andes Technology AX45MP L2 Cache controller" + help + Support for the L2 cache controller on Andes Technology AX45MP platforms. diff --git a/drivers/soc/renesas/rzfive/Makefile b/drivers/soc/renesas/rzfive/Makefile new file mode 100644 index 000000000000..2012e7fb978d --- /dev/null +++ b/drivers/soc/renesas/rzfive/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_AX45MP_L2_CACHE) += ax45mp_cache.o diff --git a/drivers/soc/renesas/rzfive/ax45mp_cache.c b/drivers/soc/renesas/rzfive/ax45mp_cache.c new file mode 100644 index 000000000000..d98f71b86b9b --- /dev/null +++ b/drivers/soc/renesas/rzfive/ax45mp_cache.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * non-coherent cache functions for Andes AX45MP + * + * Copyright (C) 2022 Renesas Electronics Corp. + */ + +#include <linux/cacheflush.h> +#include <linux/cacheinfo.h> +#include <linux/dma-direction.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> + +#include <asm/cacheflush.h> +#include <asm/sbi.h> + +/* L2 cache registers */ +#define AX45MP_L2C_REG_CTL_OFFSET 0x8 + +#define AX45MP_L2C_REG_C0_CMD_OFFSET 0x40 +#define AX45MP_L2C_REG_C0_ACC_OFFSET 0x48 +#define AX45MP_L2C_REG_STATUS_OFFSET 0x80 + +/* D-cache operation */ +#define AX45MP_CCTL_L1D_VA_INVAL 0 +#define AX45MP_CCTL_L1D_VA_WB 1 + +/* L2 CCTL status */ +#define AX45MP_CCTL_L2_STATUS_IDLE 0 + +/* L2 CCTL status cores mask */ +#define AX45MP_CCTL_L2_STATUS_C0_MASK 0xf + +/* L2 cache operation */ +#define AX45MP_CCTL_L2_PA_INVAL 0x8 +#define AX45MP_CCTL_L2_PA_WB 0x9 + +#define AX45MP_L2C_REG_PER_CORE_OFFSET 0x10 +#define AX45MP_CCTL_L2_STATUS_PER_CORE_OFFSET 4 + +#define AX45MP_L2C_REG_CN_CMD_OFFSET(n) \ + (AX45MP_L2C_REG_C0_CMD_OFFSET + ((n) * AX45MP_L2C_REG_PER_CORE_OFFSET)) +#define AX45MP_L2C_REG_CN_ACC_OFFSET(n) \ + (AX45MP_L2C_REG_C0_ACC_OFFSET + ((n) * AX45MP_L2C_REG_PER_CORE_OFFSET)) +#define AX45MP_CCTL_L2_STATUS_CN_MASK(n) \ + (AX45MP_CCTL_L2_STATUS_C0_MASK << ((n) * AX45MP_CCTL_L2_STATUS_PER_CORE_OFFSET)) + +#define AX45MP_CCTL_REG_UCCTLBEGINADDR_NUM 0x80b +#define AX45MP_CCTL_REG_UCCTLCOMMAND_NUM 0x80c + +#define AX45MP_CACHE_LINE_SIZE 64 + +struct ax45mp_priv { + void __iomem *l2c_base; + u32 ax45mp_cache_line_size; +}; + +static struct ax45mp_priv *ax45mp_priv; +static DEFINE_STATIC_KEY_FALSE(ax45mp_l2c_configured); + +/* L2 Cache operations */ +static inline uint32_t ax45mp_cpu_l2c_get_cctl_status(void) +{ + return readl(ax45mp_priv->l2c_base + AX45MP_L2C_REG_STATUS_OFFSET); +} + +/* + * Software trigger CCTL operation (cache maintenance operations) by writing + * to ucctlcommand and ucctlbeginaddr registers and write-back an L2 cache + * entry. + */ +static void ax45mp_cpu_dcache_wb_range(void *start, void *end, int line_size) +{ + void __iomem *base = ax45mp_priv->l2c_base; + int mhartid = smp_processor_id(); + unsigned long pa; + + while (end > start) { + csr_write(AX45MP_CCTL_REG_UCCTLBEGINADDR_NUM, start); + csr_write(AX45MP_CCTL_REG_UCCTLCOMMAND_NUM, AX45MP_CCTL_L1D_VA_WB); + + pa = virt_to_phys(start); + writel(pa, base + AX45MP_L2C_REG_CN_ACC_OFFSET(mhartid)); + writel(AX45MP_CCTL_L2_PA_WB, + base + AX45MP_L2C_REG_CN_CMD_OFFSET(mhartid)); + while ((ax45mp_cpu_l2c_get_cctl_status() & + AX45MP_CCTL_L2_STATUS_CN_MASK(mhartid)) != + AX45MP_CCTL_L2_STATUS_IDLE) + ; + + start += line_size; + } +} + +/* + * Software trigger CCTL operation by writing to ucctlcommand and ucctlbeginaddr + * registers and invalidate the L2 cache entry. + */ +static void ax45mp_cpu_dcache_inval_range(void *start, void *end, int line_size) +{ + void __iomem *base = ax45mp_priv->l2c_base; + int mhartid = smp_processor_id(); + unsigned long pa; + + while (end > start) { + csr_write(AX45MP_CCTL_REG_UCCTLBEGINADDR_NUM, start); + csr_write(AX45MP_CCTL_REG_UCCTLCOMMAND_NUM, AX45MP_CCTL_L1D_VA_INVAL); + + pa = virt_to_phys(start); + writel(pa, base + AX45MP_L2C_REG_CN_ACC_OFFSET(mhartid)); + writel(AX45MP_CCTL_L2_PA_INVAL, + base + AX45MP_L2C_REG_CN_CMD_OFFSET(mhartid)); + while ((ax45mp_cpu_l2c_get_cctl_status() & + AX45MP_CCTL_L2_STATUS_CN_MASK(mhartid)) != + AX45MP_CCTL_L2_STATUS_IDLE) + ; + + start += line_size; + } +} + +static void ax45mp_cpu_dma_inval_range(void *vaddr, size_t size) +{ + char cache_buf[2][AX45MP_CACHE_LINE_SIZE]; + unsigned long start = (unsigned long)vaddr; + unsigned long end = start + size; + unsigned long old_start = start; + unsigned long old_end = end; + unsigned long line_size; + unsigned long flags; + + if (unlikely(start == end)) + return; + + line_size = ax45mp_priv->ax45mp_cache_line_size; + + memset(&cache_buf, 0x0, sizeof(cache_buf)); + start = start & (~(line_size - 1)); + end = ((end + line_size - 1) & (~(line_size - 1))); + + local_irq_save(flags); + if (unlikely(start != old_start)) + memcpy(&cache_buf[0][0], (void *)start, line_size); + + if (unlikely(end != old_end)) + memcpy(&cache_buf[1][0], (void *)(old_end & (~(line_size - 1))), line_size); + + ax45mp_cpu_dcache_inval_range(vaddr, (void *)end, line_size); + + if (unlikely(start != old_start)) + memcpy((void *)start, &cache_buf[0][0], (old_start & (line_size - 1))); + + local_irq_restore(flags); +} + +static void ax45mp_cpu_dma_wb_range(void *vaddr, size_t size) +{ + unsigned long start = (unsigned long)vaddr; + unsigned long end = start + size; + unsigned long line_size; + unsigned long flags; + + line_size = ax45mp_priv->ax45mp_cache_line_size; + local_irq_save(flags); + start = start & (~(line_size - 1)); + ax45mp_cpu_dcache_wb_range(vaddr, (void *)end, line_size); + local_irq_restore(flags); +} + +void ax45mp_no_iocp_cmo(unsigned int cache_size, void *vaddr, size_t size, int dir, int ops) +{ + if (ops == NON_COHERENT_DMA_PREP) + return; + + if (!static_branch_unlikely(&ax45mp_l2c_configured)) + return; + + if (ops == NON_COHERENT_SYNC_DMA_FOR_DEVICE) { + switch (dir) { + case DMA_FROM_DEVICE: + ax45mp_cpu_dma_inval_range(vaddr, size); + break; + case DMA_TO_DEVICE: + case DMA_BIDIRECTIONAL: + ax45mp_cpu_dma_wb_range(vaddr, size); + break; + default: + break; + } + return; + } + + /* op == NON_COHERENT_SYNC_DMA_FOR_CPU */ + if (dir == DMA_BIDIRECTIONAL || dir == DMA_FROM_DEVICE) + ax45mp_cpu_dma_inval_range(vaddr, size); +} +EXPORT_SYMBOL(ax45mp_no_iocp_cmo); + +static void ax45mp_configure_l2_cache(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + int ret; + + ret = of_property_read_u32(np, "cache-line-size", &ax45mp_priv->ax45mp_cache_line_size); + if (ret) { + dev_err(dev, "Failed to get cache-line-size, defaulting to 64 bytes\n"); + ax45mp_priv->ax45mp_cache_line_size = AX45MP_CACHE_LINE_SIZE; + } + + if (ax45mp_priv->ax45mp_cache_line_size != AX45MP_CACHE_LINE_SIZE) { + dev_err(dev, "Expected cache-line-size to be 64 bytes (found:%u). Defaulting to 64 bytes\n", + ax45mp_priv->ax45mp_cache_line_size); + ax45mp_priv->ax45mp_cache_line_size = AX45MP_CACHE_LINE_SIZE; + } +} + +static int ax45mp_l2c_probe(struct platform_device *pdev) +{ + ax45mp_priv = devm_kzalloc(&pdev->dev, sizeof(*ax45mp_priv), GFP_KERNEL); + if (!ax45mp_priv) + return -ENOMEM; + + ax45mp_priv->l2c_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(ax45mp_priv->l2c_base)) + return PTR_ERR(ax45mp_priv->l2c_base); + + ax45mp_configure_l2_cache(pdev); + + static_branch_enable(&ax45mp_l2c_configured); + + return 0; +} + +static const struct of_device_id ax45mp_cache_ids[] = { + { .compatible = "andestech,ax45mp-cache" }, + { /* sentinel */ } +}; + +static struct platform_driver ax45mp_l2c_driver = { + .driver = { + .name = "ax45mp-l2c", + .of_match_table = ax45mp_cache_ids, + }, + .probe = ax45mp_l2c_probe, +}; + +static int __init ax45mp_cache_init(void) +{ + return platform_driver_register(&ax45mp_l2c_driver); +} +arch_initcall(ax45mp_cache_init); + +MODULE_AUTHOR("Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Andes AX45MP L2 cache driver"); +MODULE_LICENSE("GPL"); -- 2.25.1
