[PATCH v4] amba: consolidate PrimeCell magic
Linus Walleij
linus.walleij at stericsson.com
Thu Aug 18 03:58:31 EDT 2011
From: Linus Walleij <linus.walleij at linaro.org>
Since two drivers use the PrimeCell scheme without using the
amba_bus driver logic, let's break the magic lookups out as
static inlines in the <linux/amba/bus.h> header so we get
some consolidation anyway. Delete the primecell ID check in
common/pl330.c since it is only used from the amba_bus driver
in drivers/dma, which is already doing the same check when
probing in drivers/amba/bus.c.
Cc: Kukjin Kim <kgene.kim at samsung.com>
Cc: Viresh Kumar <viresh.kumar at st.com>
Acked-by: H Hartley Sweeten <hartleys at visionengravers.com>
Acked-by: Jassi Brar <jassisinghbrar at gmail.com>
Acked-by: Boojin Kim <boojin.kim at samsung.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
Changes V3->v4:
- Fix up sparse warning due to inelegant cast to (u32) in vic.c,
we cast to (unsigned long) and sparse is happy.
---
arch/arm/common/pl330.c | 40 +++-------------------------------------
arch/arm/common/vic.c | 15 ++++++++-------
drivers/amba/bus.c | 19 +++----------------
drivers/dma/ste_dma40.c | 14 ++++----------
drivers/mtd/nand/fsmc_nand.c | 10 +++-------
include/linux/amba/bus.h | 26 ++++++++++++++++++++++++++
6 files changed, 47 insertions(+), 77 deletions(-)
diff --git a/arch/arm/common/pl330.c b/arch/arm/common/pl330.c
index 97912fa..623ce74 100644
--- a/arch/arm/common/pl330.c
+++ b/arch/arm/common/pl330.c
@@ -27,6 +27,7 @@
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
+#include <linux/amba/bus.h>
#include <asm/hardware/pl330.h>
@@ -111,9 +112,6 @@
#define CR4 0xe10
#define CRD 0xe14
-#define PERIPH_ID 0xfe0
-#define PCELL_ID 0xff0
-
#define CR0_PERIPH_REQ_SET (1 << 0)
#define CR0_BOOT_EN_SET (1 << 1)
#define CR0_BOOT_MAN_NS (1 << 2)
@@ -142,14 +140,6 @@
#define CRD_DATA_BUFF_SHIFT 20
#define CRD_DATA_BUFF_MASK 0x3ff
-#define PART 0x330
-#define DESIGNER 0x41
-#define REVISION 0x0
-#define INTEG_CFG 0x0
-#define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12))
-
-#define PCELL_ID_VAL 0xb105f00d
-
#define PL330_STATE_STOPPED (1 << 0)
#define PL330_STATE_EXECUTING (1 << 1)
#define PL330_STATE_WFE (1 << 2)
@@ -372,19 +362,6 @@ static inline bool _manager_ns(struct pl330_thread *thrd)
return (pl330->pinfo->pcfg.mode & DMAC_MODE_NS) ? true : false;
}
-static inline u32 get_id(struct pl330_info *pi, u32 off)
-{
- void __iomem *regs = pi->base;
- u32 id = 0;
-
- id |= (readb(regs + off + 0x0) << 0);
- id |= (readb(regs + off + 0x4) << 8);
- id |= (readb(regs + off + 0x8) << 16);
- id |= (readb(regs + off + 0xc) << 24);
-
- return id;
-}
-
static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[],
enum pl330_dst da, u16 val)
{
@@ -1747,8 +1724,8 @@ static void read_dmac_config(struct pl330_info *pi)
pi->pcfg.irq_ns = readl(regs + CR3);
- pi->pcfg.periph_id = get_id(pi, PERIPH_ID);
- pi->pcfg.pcell_id = get_id(pi, PCELL_ID);
+ pi->pcfg.periph_id = amba_get_pid(pi->base, PCELL_SIZE);
+ pi->pcfg.pcell_id = amba_get_cid(pi->base, PCELL_SIZE);
}
static inline void _reset_thread(struct pl330_thread *thrd)
@@ -1838,7 +1815,6 @@ static int dmac_alloc_resources(struct pl330_dmac *pl330)
int pl330_add(struct pl330_info *pi)
{
struct pl330_dmac *pl330;
- void __iomem *regs;
int i, ret;
if (!pi || !pi->dev)
@@ -1855,16 +1831,6 @@ int pl330_add(struct pl330_info *pi)
if (pi->dmac_reset)
pi->dmac_reset(pi);
- regs = pi->base;
-
- /* Check if we can handle this DMAC */
- if ((get_id(pi, PERIPH_ID) & 0xfffff) != PERIPH_ID_VAL
- || get_id(pi, PCELL_ID) != PCELL_ID_VAL) {
- dev_err(pi->dev, "PERIPH_ID 0x%x, PCELL_ID 0x%x !\n",
- get_id(pi, PERIPH_ID), get_id(pi, PCELL_ID));
- return -EINVAL;
- }
-
/* Read the configuration of the DMAC */
read_dmac_config(pi);
diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index 7aa4262..84a51ea 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -341,16 +341,17 @@ static void __init vic_init_st(void __iomem *base, unsigned int irq_start,
void __init vic_init(void __iomem *base, unsigned int irq_start,
u32 vic_sources, u32 resume_sources)
{
- unsigned int i;
u32 cellid = 0;
enum amba_vendor vendor;
- /* Identify which VIC cell this one is, by reading the ID */
- for (i = 0; i < 4; i++) {
- u32 addr = ((u32)base & PAGE_MASK) + 0xfe0 + (i * 4);
- cellid |= (readl(addr) & 0xff) << (8 * i);
- }
- vendor = (cellid >> 12) & 0xff;
+ /*
+ * Identify which VIC cell this one is, by reading the ID - some
+ * implementations have two VICs in the same page but only one set
+ * of ID registers at the end, so we need to adjust the base to
+ * reference the page offset. All VIC:s are size 4K.
+ */
+ cellid = amba_get_pid((void __iomem *)((unsigned long)base & PAGE_MASK), SZ_4K);
+ vendor = AMBA_MANF_BITS(cellid);
printk(KERN_INFO "VIC @%p: id 0x%08x, vendor 0x%02x\n",
base, cellid, vendor);
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index d74926e..7412671 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -579,7 +579,7 @@ int amba_device_register(struct amba_device *dev, struct resource *parent)
{
u32 size;
void __iomem *tmp;
- int i, ret;
+ int ret;
device_initialize(&dev->dev);
@@ -620,24 +620,11 @@ int amba_device_register(struct amba_device *dev, struct resource *parent)
ret = amba_get_enable_pclk(dev);
if (ret == 0) {
- u32 pid, cid;
-
- /*
- * Read pid and cid based on size of resource
- * they are located at end of region
- */
- for (pid = 0, i = 0; i < 4; i++)
- pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
- (i * 8);
- for (cid = 0, i = 0; i < 4; i++)
- cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
- (i * 8);
+ if (amba_get_cid(tmp, size) == AMBA_CID)
+ dev->periphid = amba_get_pid(tmp, size);
amba_put_disable_pclk(dev);
- if (cid == AMBA_CID)
- dev->periphid = pid;
-
if (!dev->periphid)
ret = -ENODEV;
}
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index cd3a7c7..6e11cef 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -2569,7 +2569,6 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
int num_phy_chans;
int i;
u32 pid;
- u32 cid;
u8 rev;
clk = clk_get(&pdev->dev, NULL);
@@ -2594,18 +2593,13 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
if (!virtbase)
goto failure;
- /* This is just a regular AMBA PrimeCell ID actually */
- for (pid = 0, i = 0; i < 4; i++)
- pid |= (readl(virtbase + resource_size(res) - 0x20 + 4 * i)
- & 255) << (i * 8);
- for (cid = 0, i = 0; i < 4; i++)
- cid |= (readl(virtbase + resource_size(res) - 0x10 + 4 * i)
- & 255) << (i * 8);
-
- if (cid != AMBA_CID) {
+ /* Device ID use the AMBA PrimeCell scheme */
+ if (amba_get_cid(virtbase, resource_size(res)) != AMBA_CID) {
d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n");
goto failure;
}
+
+ pid = amba_get_pid(virtbase, resource_size(res));
if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n",
AMBA_MANF_BITS(pid),
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index e9b275a..836de62 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -541,8 +541,6 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
struct fsmc_regs *regs;
struct resource *res;
int ret = 0;
- u32 pid;
- int i;
if (!pdata) {
dev_err(&pdev->dev, "platform data is NULL\n");
@@ -636,13 +634,11 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
* This device ID is actually a common AMBA ID as used on the
* AMBA PrimeCell bus. However it is not a PrimeCell.
*/
- for (pid = 0, i = 0; i < 4; i++)
- pid |= (readl(host->regs_va + resource_size(res) - 0x20 + 4 * i) & 255) << (i * 8);
- host->pid = pid;
+ host->pid = amba_get_pid(host->regs_va, resource_size(res));
dev_info(&pdev->dev, "FSMC device partno %03x, manufacturer %02x, "
"revision %02x, config %02x\n",
- AMBA_PART_BITS(pid), AMBA_MANF_BITS(pid),
- AMBA_REV_BITS(pid), AMBA_CONFIG_BITS(pid));
+ AMBA_PART_BITS(host->pid), AMBA_MANF_BITS(host->pid),
+ AMBA_REV_BITS(host->pid), AMBA_CONFIG_BITS(host->pid));
host->bank = pdata->bank;
host->select_chip = pdata->select_bank;
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index fcbbe71..008cfcf 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -19,6 +19,7 @@
#include <linux/err.h>
#include <linux/resource.h>
#include <linux/regulator/consumer.h>
+#include <linux/io.h>
#define AMBA_NR_IRQS 2
#define AMBA_CID 0xb105f00d
@@ -94,4 +95,29 @@ void amba_release_regions(struct amba_device *);
#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
#define amba_part(d) AMBA_PART_BITS((d)->periphid)
+/*
+ * Inlines to extract the PID and CID for a certain PrimeCell. These are at
+ * offset -0x20 and -0x10 from the end of the I/O region respectively.
+ */
+static inline u32 amba_get_magic(void __iomem *base, u32 size, u8 offset)
+{
+ u32 magic;
+ int i;
+
+ for (magic = 0, i = 0; i < 4; i++)
+ magic |= (readl(base + size - offset + 4 * i) & 255)
+ << (i * 8);
+ return magic;
+}
+
+static inline u32 amba_get_pid(void __iomem *base, u32 size)
+{
+ return amba_get_magic(base, size, 0x20);
+}
+
+static inline u32 amba_get_cid(void __iomem *base, u32 size)
+{
+ return amba_get_magic(base, size, 0x10);
+}
+
#endif
--
1.7.3.2
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