[PATCH v9 3/5] qe_common: add qe_muram_ functions to manage muram

From: Zhao Qiang
Date: Sun Sep 13 2015 - 21:45:10 EST

muram is used for qe, add qe_muram_ functions to manage
muram.

Signed-off-by: Zhao Qiang <qiang.zhao@xxxxxxxxxxxxx>
---
Changes for v2:
- no changes
Changes for v3:
- no changes
Changes for v4:
- no changes
Changes for v5:
- no changes
Changes for v6:
- using genalloc instead rheap to manage QE MURAM
- remove qe_reset from platform file, using
- subsys_initcall to call qe_init function.
Changes for v7:
- move this patch from 3/3 to 2/3
- convert cpm with genalloc
- check for gen_pool allocation failure
Changes for v8:
- rebase
- move BD_SC_* macro instead of copy
Changes for v9:
- doesn't modify CPM, add a new patch to modify.
- rebase

arch/powerpc/include/asm/qe.h | 43 +++++-
arch/powerpc/platforms/83xx/km83xx.c | 2 -
arch/powerpc/platforms/83xx/mpc832x_mds.c | 2 -
arch/powerpc/platforms/83xx/mpc832x_rdb.c | 2 -
arch/powerpc/platforms/83xx/mpc836x_mds.c | 2 -
arch/powerpc/platforms/83xx/mpc836x_rdk.c | 3 -
arch/powerpc/platforms/85xx/common.c | 1 -
arch/powerpc/platforms/Kconfig | 1 +
arch/powerpc/sysdev/qe_lib/Makefile | 2 +-
arch/powerpc/sysdev/qe_lib/qe.c | 15 ++
arch/powerpc/sysdev/qe_lib/qe_common.c | 242 ++++++++++++++++++++++++++++++
11 files changed, 294 insertions(+), 21 deletions(-)
create mode 100644 arch/powerpc/sysdev/qe_lib/qe_common.c

diff --git a/arch/powerpc/include/asm/qe.h b/arch/powerpc/include/asm/qe.h
index 32b9bfa..3af9033 100644
--- a/arch/powerpc/include/asm/qe.h
+++ b/arch/powerpc/include/asm/qe.h
@@ -16,10 +16,13 @@
#define _ASM_POWERPC_QE_H
#ifdef __KERNEL__

+#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/err.h>
-#include <asm/cpm.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/types.h>
#include <asm/immap_qe.h>

#define QE_NUM_OF_SNUM 256 /* There are 256 serial number in QE */
@@ -186,13 +189,16 @@ static inline int qe_alive_during_sleep(void)
#endif
}

-/* we actually use cpm_muram implementation, define this for convenience */
-#define qe_muram_init cpm_muram_init
-#define qe_muram_alloc cpm_muram_alloc
-#define qe_muram_alloc_fixed cpm_muram_alloc_fixed
-#define qe_muram_free cpm_muram_free
-#define qe_muram_addr cpm_muram_addr
-#define qe_muram_offset cpm_muram_offset
+int qe_muram_init(void);
+
+#if defined(CONFIG_QUICC_ENGINE)
+unsigned long qe_muram_alloc(unsigned long size, unsigned long align);
+unsigned long qe_muram_alloc_fixed(unsigned long offset, unsigned long size);
+int qe_muram_free(unsigned long offset);
+void __iomem *qe_muram_addr(unsigned long offset);
+unsigned long qe_muram_offset(void __iomem *addr);
+dma_addr_t qe_muram_dma(void __iomem *addr);
+#endif /* defined(CONFIG_QUICC_ENGINE) */

/* Structure that defines QE firmware binary files.
*
@@ -266,6 +272,27 @@ struct qe_bd {
#define BD_STATUS_MASK 0xffff0000
#define BD_LENGTH_MASK 0x0000ffff

+/* Buffer descriptor control/status used by serial
+ */
+
+#define BD_SC_EMPTY (0x8000) /* Receive is empty */
+#define BD_SC_READY (0x8000) /* Transmit is ready */
+#define BD_SC_WRAP (0x2000) /* Last buffer descriptor */
+#define BD_SC_INTRPT (0x1000) /* Interrupt on change */
+#define BD_SC_LAST (0x0800) /* Last buffer in frame */
+#define BD_SC_TC (0x0400) /* Transmit CRC */
+#define BD_SC_CM (0x0200) /* Continuous mode */
+#define BD_SC_ID (0x0100) /* Rec'd too many idles */
+#define BD_SC_P (0x0100) /* xmt preamble */
+#define BD_SC_BR (0x0020) /* Break received */
+#define BD_SC_FR (0x0010) /* Framing error */
+#define BD_SC_PR (0x0008) /* Parity error */
+#define BD_SC_NAK (0x0004) /* NAK - did not respond */
+#define BD_SC_OV (0x0002) /* Overrun */
+#define BD_SC_UN (0x0002) /* Underrun */
+#define BD_SC_CD (0x0001) /* */
+#define BD_SC_CL (0x0001) /* Collision */
+
/* Alignment */
#define QE_INTR_TABLE_ALIGN 16 /* ??? */
#define QE_ALIGNMENT_OF_BD 8
diff --git a/arch/powerpc/platforms/83xx/km83xx.c b/arch/powerpc/platforms/83xx/km83xx.c
index bf4c447..ae111581 100644
--- a/arch/powerpc/platforms/83xx/km83xx.c
+++ b/arch/powerpc/platforms/83xx/km83xx.c
@@ -136,8 +136,6 @@ static void __init mpc83xx_km_setup_arch(void)
mpc83xx_setup_pci();

#ifdef CONFIG_QUICC_ENGINE
- qe_reset();
-
np = of_find_node_by_name(NULL, "par_io");
if (np != NULL) {
par_io_init(np);
diff --git a/arch/powerpc/platforms/83xx/mpc832x_mds.c b/arch/powerpc/platforms/83xx/mpc832x_mds.c
index 8d76220..aacc43f 100644
--- a/arch/powerpc/platforms/83xx/mpc832x_mds.c
+++ b/arch/powerpc/platforms/83xx/mpc832x_mds.c
@@ -74,8 +74,6 @@ static void __init mpc832x_sys_setup_arch(void)
mpc83xx_setup_pci();

#ifdef CONFIG_QUICC_ENGINE
- qe_reset();
-
if ((np = of_find_node_by_name(NULL, "par_io")) != NULL) {
par_io_init(np);
of_node_put(np);
diff --git a/arch/powerpc/platforms/83xx/mpc832x_rdb.c b/arch/powerpc/platforms/83xx/mpc832x_rdb.c
index eff5baa..0c7a43e 100644
--- a/arch/powerpc/platforms/83xx/mpc832x_rdb.c
+++ b/arch/powerpc/platforms/83xx/mpc832x_rdb.c
@@ -203,8 +203,6 @@ static void __init mpc832x_rdb_setup_arch(void)
mpc83xx_setup_pci();

#ifdef CONFIG_QUICC_ENGINE
- qe_reset();
-
if ((np = of_find_node_by_name(NULL, "par_io")) != NULL) {
par_io_init(np);
of_node_put(np);
diff --git a/arch/powerpc/platforms/83xx/mpc836x_mds.c b/arch/powerpc/platforms/83xx/mpc836x_mds.c
index 1a26d2f..eb24abd 100644
--- a/arch/powerpc/platforms/83xx/mpc836x_mds.c
+++ b/arch/powerpc/platforms/83xx/mpc836x_mds.c
@@ -82,8 +82,6 @@ static void __init mpc836x_mds_setup_arch(void)
mpc83xx_setup_pci();

#ifdef CONFIG_QUICC_ENGINE
- qe_reset();
-
if ((np = of_find_node_by_name(NULL, "par_io")) != NULL) {
par_io_init(np);
of_node_put(np);
diff --git a/arch/powerpc/platforms/83xx/mpc836x_rdk.c b/arch/powerpc/platforms/83xx/mpc836x_rdk.c
index b63b42d..823e370 100644
--- a/arch/powerpc/platforms/83xx/mpc836x_rdk.c
+++ b/arch/powerpc/platforms/83xx/mpc836x_rdk.c
@@ -35,9 +35,6 @@ static void __init mpc836x_rdk_setup_arch(void)
ppc_md.progress("mpc836x_rdk_setup_arch()", 0);

mpc83xx_setup_pci();
-#ifdef CONFIG_QUICC_ENGINE
- qe_reset();
-#endif
}

/*
diff --git a/arch/powerpc/platforms/85xx/common.c b/arch/powerpc/platforms/85xx/common.c
index 7bfb9b1..0f91edc 100644
--- a/arch/powerpc/platforms/85xx/common.c
+++ b/arch/powerpc/platforms/85xx/common.c
@@ -105,7 +105,6 @@ void __init mpc85xx_qe_init(void)
return;
}

- qe_reset();
of_node_put(np);

}
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index b7f9c40..01f98a2 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -276,6 +276,7 @@ config QUICC_ENGINE
bool "Freescale QUICC Engine (QE) Support"
depends on FSL_SOC && PPC32
select PPC_LIB_RHEAP
+ select GENERIC_ALLOCATOR
select CRC32
help
The QUICC Engine (QE) is a new generation of communications
diff --git a/arch/powerpc/sysdev/qe_lib/Makefile b/arch/powerpc/sysdev/qe_lib/Makefile
index f1855c1..9507a27 100644
--- a/arch/powerpc/sysdev/qe_lib/Makefile
+++ b/arch/powerpc/sysdev/qe_lib/Makefile
@@ -1,7 +1,7 @@
#
# Makefile for the linux ppc-specific parts of QE
#
-obj-$(CONFIG_QUICC_ENGINE)+= qe.o qe_ic.o qe_io.o
+obj-$(CONFIG_QUICC_ENGINE)+= qe.o qe_common.o qe_ic.o qe_io.o

obj-$(CONFIG_UCC) += ucc.o
obj-$(CONFIG_UCC_SLOW) += ucc_slow.o
diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c
index c2518cd..3f9f596 100644
--- a/arch/powerpc/sysdev/qe_lib/qe.c
+++ b/arch/powerpc/sysdev/qe_lib/qe.c
@@ -671,6 +671,21 @@ unsigned int qe_get_num_of_snums(void)
}
EXPORT_SYMBOL(qe_get_num_of_snums);

+static int __init qe_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,qe");
+ if (!np) {
+ pr_err("%s: Could not find Quicc Engine node\n", __func__);
+ return -ENODEV;
+ }
+ qe_reset();
+ of_node_put(np);
+ return 0;
+}
+subsys_initcall(qe_init);
+
#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC_85xx)
static int qe_resume(struct platform_device *ofdev)
{
diff --git a/arch/powerpc/sysdev/qe_lib/qe_common.c b/arch/powerpc/sysdev/qe_lib/qe_common.c
new file mode 100644
index 0000000..1213458
--- /dev/null
+++ b/arch/powerpc/sysdev/qe_lib/qe_common.c
@@ -0,0 +1,242 @@
+/*
+ * Freescale QE common code
+ *
+ * Author: Zhao Qiang <qiang.zhao@xxxxxxxxxxxxx>
+ *
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/genalloc.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+#include <linux/spinlock.h>
+#include <linux/export.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include <linux/io.h>
+#include <asm/qe.h>
+
+static struct gen_pool *muram_pool;
+static struct genpool_data_align muram_pool_data;
+static struct genpool_data_fixed muram_pool_data_fixed;
+static spinlock_t qe_muram_lock;
+static u8 __iomem *muram_vbase;
+static phys_addr_t muram_pbase;
+
+struct muram_block {
+ struct list_head head;
+ unsigned long start;
+ int size;
+};
+
+static LIST_HEAD(muram_block_list);
+
+/* max address size we deal with */
+#define OF_MAX_ADDR_CELLS 4
+#define GENPOOL_OFFSET 4096
+
+int qe_muram_init(void)
+{
+ struct device_node *np;
+ struct resource r;
+ u32 zero[OF_MAX_ADDR_CELLS] = {};
+ resource_size_t max = 0;
+ int i = 0;
+ int ret = 0;
+
+ if (muram_pbase)
+ return 0;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,qe-muram-data");
+ if (!np) {
+ /* try legacy bindings */
+ np = of_find_node_by_name(NULL, "data-only");
+ if (!np) {
+ pr_err("Cannot find CPM muram data node");
+ ret = -ENODEV;
+ goto out;
+ }
+ }
+
+ muram_pool = gen_pool_create(1, -1);
+ muram_pbase = of_translate_address(np, zero);
+ if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
+ pr_err("Cannot translate zero through CPM muram node");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ while (of_address_to_resource(np, i++, &r) == 0) {
+ if (r.end > max)
+ max = r.end;
+ ret = gen_pool_add(muram_pool, r.start - muram_pbase +
+ GENPOOL_OFFSET, resource_size(&r), -1);
+ if (ret) {
+ pr_err("QE: couldn't add muram to pool!\n");
+ goto err;
+ }
+
+ }
+
+ muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
+ if (!muram_vbase) {
+ pr_err("Cannot map QE muram");
+ ret = -ENOMEM;
+ goto err;
+ }
+ goto out;
+err:
+ gen_pool_destroy(muram_pool);
+out:
+ of_node_put(np);
+ return ret;
+}
+
+/*
+ * qe_muram_alloc - allocate the requested size worth of multi-user ram
+ * @size: number of bytes to allocate
+ * @align: requested alignment, in bytes
+ *
+ * This function returns an offset into the muram area.
+ */
+unsigned long qe_muram_alloc(unsigned long size, unsigned long align)
+{
+ unsigned long start;
+ unsigned long flags;
+ struct muram_block *entry;
+
+ spin_lock_irqsave(&qe_muram_lock, flags);
+ muram_pool_data.align = align;
+ gen_pool_set_algo(muram_pool, gen_pool_first_fit_align,
+ &muram_pool_data);
+ start = gen_pool_alloc(muram_pool, size);
+ if (!start)
+ goto out2;
+ start = start - GENPOOL_OFFSET;
+ memset(qe_muram_addr(start), 0, size);
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ goto out1;
+ entry->start = start;
+ entry->size = size;
+ list_add(&entry->head, &muram_block_list);
+ spin_unlock_irqrestore(&qe_muram_lock, flags);
+
+ return start;
+out1:
+ gen_pool_free(muram_pool, start, size);
+out2:
+ spin_unlock_irqrestore(&qe_muram_lock, flags);
+ return (unsigned long) -ENOMEM;
+}
+EXPORT_SYMBOL(qe_muram_alloc);
+
+/*
+ * qe_muram_alloc_fixed - reserve a specific region of multi-user ram
+ * @size: number of bytes to allocate
+ * @offset: offset of allocation start address
+ *
+ * This function returns an offset into the muram area.
+ */
+unsigned long qe_muram_alloc_fixed(unsigned long offset, unsigned long size)
+{
+
+ unsigned long start;
+ unsigned long flags;
+ unsigned long size_alloc = size;
+ struct muram_block *entry;
+ int end_bit;
+ int order = muram_pool -> min_alloc_order;
+
+ spin_lock_irqsave(&qe_muram_lock, flags);
+ end_bit = (offset >> order) + ((size + (1UL << order) - 1) >> order);
+ if ((offset + size) > (end_bit << order))
+ size_alloc = size + (1UL << order);
+
+ muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET;
+ gen_pool_set_algo(muram_pool, gen_pool_fixed_fit,
+ &muram_pool_data_fixed);
+ start = gen_pool_alloc(muram_pool, size_alloc);
+ if (!start)
+ goto out2;
+ start = start - GENPOOL_OFFSET;
+ memset(qe_muram_addr(start), 0, size_alloc);
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ goto out1;
+ entry->start = start;
+ entry->size = size_alloc;
+ list_add(&entry->head, &muram_block_list);
+ spin_unlock_irqrestore(&qe_muram_lock, flags);
+
+ return start;
+out1:
+ gen_pool_free(muram_pool, start, size_alloc);
+out2:
+ spin_unlock_irqrestore(&qe_muram_lock, flags);
+ return (unsigned long) -ENOMEM;
+
+
+}
+EXPORT_SYMBOL(qe_muram_alloc_fixed);
+
+/**
+ * qe_muram_free - free a chunk of multi-user ram
+ * @offset: The beginning of the chunk as returned by qe_muram_alloc().
+ */
+int qe_muram_free(unsigned long offset)
+{
+ unsigned long flags;
+ int size;
+ struct muram_block *tmp;
+
+ size = 0;
+ spin_lock_irqsave(&qe_muram_lock, flags);
+ list_for_each_entry(tmp, &muram_block_list, head) {
+ if (tmp->start == offset) {
+ size = tmp->size;
+ list_del(&tmp->head);
+ kfree(tmp);
+ break;
+ }
+ }
+ gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
+ spin_unlock_irqrestore(&qe_muram_lock, flags);
+
+ return size;
+}
+EXPORT_SYMBOL(qe_muram_free);
+
+/**
+ * qe_muram_addr - turn a muram offset into a virtual address
+ * @offset: muram offset to convert
+ */
+void __iomem *qe_muram_addr(unsigned long offset)
+{
+ return muram_vbase + offset;
+}
+EXPORT_SYMBOL(qe_muram_addr);
+
+unsigned long qe_muram_offset(void __iomem *addr)
+{
+ return addr - (void __iomem *)muram_vbase;
+}
+EXPORT_SYMBOL(qe_muram_offset);
+
+/**
+ * qe_muram_dma - turn a muram virtual address into a DMA address
+ * @offset: virtual address from qe_muram_addr() to convert
+ */
+dma_addr_t qe_muram_dma(void __iomem *addr)
+{
+ return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
+}
+EXPORT_SYMBOL(qe_muram_dma);
--
2.1.0.27.g96db324

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