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authorFabio Estevam <fabio.estevam@freescale.com>2013-06-04 10:18:45 -0300
committerShawn Guo <shawn.guo@linaro.org>2013-06-17 15:41:48 +0800
commit2046338dcbc60404ede8f034a13f02548ac70054 (patch)
tree7941058c783ee26955af656a6d5d54b36d870d14 /arch/arm/mach-mxs
parent115581cfc9dc868b5f2c230d0236976276bc9dbb (diff)
downloadlinux-linaro-stable-2046338dcbc60404ede8f034a13f02548ac70054.tar.gz
ARM: mxs: Use soc bus infrastructure
Using the soc bus infrastructure is helpful for reporting several SoC related information such as: family, machine, SoC name and SoC revision. $ cat /sys/bus/soc/devices/soc0/family Freescale MXS Family $ cat /sys/bus/soc/devices/soc0/machine Freescale i.MX28 Evaluation Kit $ cat /sys/bus/soc/devices/soc0/soc_id i.MX28 $ cat /sys/bus/soc/devices/soc0/revision TO1.2 Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-mxs')
-rw-r--r--arch/arm/mach-mxs/Kconfig1
-rw-r--r--arch/arm/mach-mxs/mach-mxs.c117
2 files changed, 117 insertions, 1 deletions
diff --git a/arch/arm/mach-mxs/Kconfig b/arch/arm/mach-mxs/Kconfig
index 4dc2fbba0ecd..59c30ef56790 100644
--- a/arch/arm/mach-mxs/Kconfig
+++ b/arch/arm/mach-mxs/Kconfig
@@ -25,6 +25,7 @@ config ARCH_MXS
select GENERIC_CLOCKEVENTS
select HAVE_CLK_PREPARE
select PINCTRL
+ select SOC_BUS
select SOC_IMX23
select SOC_IMX28
select STMP_DEVICE
diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c
index 66fe810aa631..f0bf6076fa32 100644
--- a/arch/arm/mach-mxs/mach-mxs.c
+++ b/arch/arm/mach-mxs/mach-mxs.c
@@ -25,6 +25,7 @@
#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/sys_soc.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
@@ -38,12 +39,28 @@
#define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0 0x2
#define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR1 0x3
+#define HW_DIGCTL_CHIPID 0x310
+#define HW_DIGCTL_CHIPID_MASK (0xffff << 16)
+#define HW_DIGCTL_REV_MASK 0xff
+#define HW_DIGCTL_CHIPID_MX23 (0x3780 << 16)
+#define HW_DIGCTL_CHIPID_MX28 (0x2800 << 16)
+
+#define MXS_CHIP_REVISION_1_0 0x10
+#define MXS_CHIP_REVISION_1_1 0x11
+#define MXS_CHIP_REVISION_1_2 0x12
+#define MXS_CHIP_REVISION_1_3 0x13
+#define MXS_CHIP_REVISION_1_4 0x14
+#define MXS_CHIP_REV_UNKNOWN 0xff
+
#define MXS_GPIO_NR(bank, nr) ((bank) * 32 + (nr))
#define MXS_SET_ADDR 0x4
#define MXS_CLR_ADDR 0x8
#define MXS_TOG_ADDR 0xc
+static u32 chipid;
+static u32 socid;
+
static inline void __mxs_setl(u32 mask, void __iomem *reg)
{
__raw_writel(mask, reg + MXS_SET_ADDR);
@@ -361,8 +378,106 @@ static void __init cfa10037_init(void)
update_fec_mac_prop(OUI_CRYSTALFONTZ);
}
+static const char __init *mxs_get_soc_id(void)
+{
+ struct device_node *np;
+ void __iomem *digctl_base;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl");
+ digctl_base = of_iomap(np, 0);
+ WARN_ON(!digctl_base);
+
+ chipid = readl(digctl_base + HW_DIGCTL_CHIPID);
+ socid = chipid & HW_DIGCTL_CHIPID_MASK;
+
+ iounmap(digctl_base);
+ of_node_put(np);
+
+ switch (socid) {
+ case HW_DIGCTL_CHIPID_MX23:
+ return "i.MX23";
+ case HW_DIGCTL_CHIPID_MX28:
+ return "i.MX28";
+ default:
+ return "Unknown";
+ }
+}
+
+static u32 __init mxs_get_cpu_rev(void)
+{
+ u32 rev = chipid & HW_DIGCTL_REV_MASK;
+
+ switch (socid) {
+ case HW_DIGCTL_CHIPID_MX23:
+ switch (rev) {
+ case 0x0:
+ return MXS_CHIP_REVISION_1_0;
+ case 0x1:
+ return MXS_CHIP_REVISION_1_1;
+ case 0x2:
+ return MXS_CHIP_REVISION_1_2;
+ case 0x3:
+ return MXS_CHIP_REVISION_1_3;
+ case 0x4:
+ return MXS_CHIP_REVISION_1_4;
+ default:
+ return MXS_CHIP_REV_UNKNOWN;
+ }
+ case HW_DIGCTL_CHIPID_MX28:
+ switch (rev) {
+ case 0x0:
+ return MXS_CHIP_REVISION_1_1;
+ case 0x1:
+ return MXS_CHIP_REVISION_1_2;
+ default:
+ return MXS_CHIP_REV_UNKNOWN;
+ }
+ default:
+ return MXS_CHIP_REV_UNKNOWN;
+ }
+}
+
+static const char __init *mxs_get_revision(void)
+{
+ u32 rev = mxs_get_cpu_rev();
+
+ if (rev != MXS_CHIP_REV_UNKNOWN)
+ return kasprintf(GFP_KERNEL, "TO%d.%d", (rev >> 4) & 0xf,
+ rev & 0xf);
+ else
+ return kasprintf(GFP_KERNEL, "%s", "Unknown");
+}
+
static void __init mxs_machine_init(void)
{
+ struct device_node *root;
+ struct device *parent;
+ struct soc_device *soc_dev;
+ struct soc_device_attribute *soc_dev_attr;
+ int ret;
+
+ soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+ if (!soc_dev_attr)
+ return;
+
+ root = of_find_node_by_path("/");
+ ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
+ if (ret)
+ return;
+
+ soc_dev_attr->family = "Freescale MXS Family";
+ soc_dev_attr->soc_id = mxs_get_soc_id();
+ soc_dev_attr->revision = mxs_get_revision();
+
+ soc_dev = soc_device_register(soc_dev_attr);
+ if (IS_ERR(soc_dev)) {
+ kfree(soc_dev_attr->revision);
+ kfree(soc_dev_attr);
+ return;
+ }
+
+ parent = soc_device_to_device(soc_dev);
+
if (of_machine_is_compatible("fsl,imx28-evk"))
imx28_evk_init();
else if (of_machine_is_compatible("bluegiga,apx4devkit"))
@@ -373,7 +488,7 @@ static void __init mxs_machine_init(void)
cfa10049_init();
of_platform_populate(NULL, of_default_bus_match_table,
- mxs_auxdata_lookup, NULL);
+ mxs_auxdata_lookup, parent);
if (of_machine_is_compatible("karo,tx28"))
tx28_post_init();