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authorOlof Johansson <olof@lixom.net>2013-12-26 10:57:50 -0800
committerOlof Johansson <olof@lixom.net>2013-12-26 10:57:50 -0800
commit92fa35e93074d025a9fd6b1b65cd00b83beef268 (patch)
treed43e434ab86473ed99f430ef2678e088db7c9b5d /arch/arm/mach-tegra
parent34edea7adc4bdf7abe724de552883dfcf39fca61 (diff)
parent9d4450ae87398e248e8700e3507748e0d1751e25 (diff)
downloadop-kernel-dev-92fa35e93074d025a9fd6b1b65cd00b83beef268.zip
op-kernel-dev-92fa35e93074d025a9fd6b1b65cd00b83beef268.tar.gz
Merge tag 'tegra-for-3.14-powergate' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/soc
From Stephen Warren: ARM: tegra: powergate driver changes This branch includes all the changes to Tegra's powergate driver for 3.14. These are separate out, since the Tegra DRM changes for 3.14 rely on the new APIs introduced here. A few cleanups and fixes are included, plus additions of Tegra124 SoC support, and a new API for manipulating Tegra's IO rail deep power down states. This branch is based on tag tegra-for-3.14-dmas-resets-rework, in order to avoid conflicts with the addition of common reset controller support to the powergate driver. * tag 'tegra-for-3.14-powergate' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux: ARM: tegra: Add IO rail support ARM: tegra: Special-case the 3D clamps on Tegra124 ARM: tegra: Add Tegra124 powergate support ARM: tegra: Export tegra_powergate_remove_clamping() ARM: tegra: Export tegra_powergate_power_off() ARM: tegra: Rename cpu0 powergate to crail ARM: tegra: Fix some whitespace oddities Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/powergate.c195
1 files changed, 192 insertions, 3 deletions
diff --git a/arch/arm/mach-tegra/powergate.c b/arch/arm/mach-tegra/powergate.c
index f6f5b54..3d0c537 100644
--- a/arch/arm/mach-tegra/powergate.c
+++ b/arch/arm/mach-tegra/powergate.c
@@ -34,6 +34,10 @@
#include "fuse.h"
#include "iomap.h"
+#define DPD_SAMPLE 0x020
+#define DPD_SAMPLE_ENABLE (1 << 0)
+#define DPD_SAMPLE_DISABLE (0 << 0)
+
#define PWRGATE_TOGGLE 0x30
#define PWRGATE_TOGGLE_START (1 << 8)
@@ -41,6 +45,19 @@
#define PWRGATE_STATUS 0x38
+#define IO_DPD_REQ 0x1b8
+#define IO_DPD_REQ_CODE_IDLE (0 << 30)
+#define IO_DPD_REQ_CODE_OFF (1 << 30)
+#define IO_DPD_REQ_CODE_ON (2 << 30)
+#define IO_DPD_REQ_CODE_MASK (3 << 30)
+
+#define IO_DPD_STATUS 0x1bc
+#define IO_DPD2_REQ 0x1c0
+#define IO_DPD2_STATUS 0x1c4
+#define SEL_DPD_TIM 0x1c8
+
+#define GPU_RG_CNTRL 0x2d4
+
static int tegra_num_powerdomains;
static int tegra_num_cpu_domains;
static const u8 *tegra_cpu_domains;
@@ -59,6 +76,13 @@ static const u8 tegra114_cpu_domains[] = {
TEGRA_POWERGATE_CPU3,
};
+static const u8 tegra124_cpu_domains[] = {
+ TEGRA_POWERGATE_CPU0,
+ TEGRA_POWERGATE_CPU1,
+ TEGRA_POWERGATE_CPU2,
+ TEGRA_POWERGATE_CPU3,
+};
+
static DEFINE_SPINLOCK(tegra_powergate_lock);
static void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE);
@@ -109,6 +133,7 @@ int tegra_powergate_power_off(int id)
return tegra_powergate_set(id, false);
}
+EXPORT_SYMBOL(tegra_powergate_power_off);
int tegra_powergate_is_powered(int id)
{
@@ -129,12 +154,23 @@ int tegra_powergate_remove_clamping(int id)
return -EINVAL;
/*
+ * The Tegra124 GPU has a separate register (with different semantics)
+ * to remove clamps.
+ */
+ if (tegra_chip_id == TEGRA124) {
+ if (id == TEGRA_POWERGATE_3D) {
+ pmc_write(0, GPU_RG_CNTRL);
+ return 0;
+ }
+ }
+
+ /*
* Tegra 2 has a bug where PCIE and VDE clamping masks are
* swapped relatively to the partition ids
*/
- if (id == TEGRA_POWERGATE_VDEC)
+ if (id == TEGRA_POWERGATE_VDEC)
mask = (1 << TEGRA_POWERGATE_PCIE);
- else if (id == TEGRA_POWERGATE_PCIE)
+ else if (id == TEGRA_POWERGATE_PCIE)
mask = (1 << TEGRA_POWERGATE_VDEC);
else
mask = (1 << id);
@@ -143,6 +179,7 @@ int tegra_powergate_remove_clamping(int id)
return 0;
}
+EXPORT_SYMBOL(tegra_powergate_remove_clamping);
/* Must be called with clk disabled, and returns with clk enabled */
int tegra_powergate_sequence_power_up(int id, struct clk *clk,
@@ -204,6 +241,11 @@ int __init tegra_powergate_init(void)
tegra_num_cpu_domains = 4;
tegra_cpu_domains = tegra114_cpu_domains;
break;
+ case TEGRA124:
+ tegra_num_powerdomains = 25;
+ tegra_num_cpu_domains = 4;
+ tegra_cpu_domains = tegra124_cpu_domains;
+ break;
default:
/* Unknown Tegra variant. Disable powergating */
tegra_num_powerdomains = 0;
@@ -245,12 +287,36 @@ static const char * const powergate_name_t30[] = {
};
static const char * const powergate_name_t114[] = {
- [TEGRA_POWERGATE_CPU] = "cpu0",
+ [TEGRA_POWERGATE_CPU] = "crail",
+ [TEGRA_POWERGATE_3D] = "3d",
+ [TEGRA_POWERGATE_VENC] = "venc",
+ [TEGRA_POWERGATE_VDEC] = "vdec",
+ [TEGRA_POWERGATE_MPE] = "mpe",
+ [TEGRA_POWERGATE_HEG] = "heg",
+ [TEGRA_POWERGATE_CPU1] = "cpu1",
+ [TEGRA_POWERGATE_CPU2] = "cpu2",
+ [TEGRA_POWERGATE_CPU3] = "cpu3",
+ [TEGRA_POWERGATE_CELP] = "celp",
+ [TEGRA_POWERGATE_CPU0] = "cpu0",
+ [TEGRA_POWERGATE_C0NC] = "c0nc",
+ [TEGRA_POWERGATE_C1NC] = "c1nc",
+ [TEGRA_POWERGATE_DIS] = "dis",
+ [TEGRA_POWERGATE_DISB] = "disb",
+ [TEGRA_POWERGATE_XUSBA] = "xusba",
+ [TEGRA_POWERGATE_XUSBB] = "xusbb",
+ [TEGRA_POWERGATE_XUSBC] = "xusbc",
+};
+
+static const char * const powergate_name_t124[] = {
+ [TEGRA_POWERGATE_CPU] = "crail",
[TEGRA_POWERGATE_3D] = "3d",
[TEGRA_POWERGATE_VENC] = "venc",
+ [TEGRA_POWERGATE_PCIE] = "pcie",
[TEGRA_POWERGATE_VDEC] = "vdec",
+ [TEGRA_POWERGATE_L2] = "l2",
[TEGRA_POWERGATE_MPE] = "mpe",
[TEGRA_POWERGATE_HEG] = "heg",
+ [TEGRA_POWERGATE_SATA] = "sata",
[TEGRA_POWERGATE_CPU1] = "cpu1",
[TEGRA_POWERGATE_CPU2] = "cpu2",
[TEGRA_POWERGATE_CPU3] = "cpu3",
@@ -258,11 +324,14 @@ static const char * const powergate_name_t114[] = {
[TEGRA_POWERGATE_CPU0] = "cpu0",
[TEGRA_POWERGATE_C0NC] = "c0nc",
[TEGRA_POWERGATE_C1NC] = "c1nc",
+ [TEGRA_POWERGATE_SOR] = "sor",
[TEGRA_POWERGATE_DIS] = "dis",
[TEGRA_POWERGATE_DISB] = "disb",
[TEGRA_POWERGATE_XUSBA] = "xusba",
[TEGRA_POWERGATE_XUSBB] = "xusbb",
[TEGRA_POWERGATE_XUSBC] = "xusbc",
+ [TEGRA_POWERGATE_VIC] = "vic",
+ [TEGRA_POWERGATE_IRAM] = "iram",
};
static int powergate_show(struct seq_file *s, void *data)
@@ -309,6 +378,9 @@ int __init tegra_powergate_debugfs_init(void)
case TEGRA114:
powergate_name = powergate_name_t114;
break;
+ case TEGRA124:
+ powergate_name = powergate_name_t124;
+ break;
}
if (powergate_name) {
@@ -322,3 +394,120 @@ int __init tegra_powergate_debugfs_init(void)
}
#endif
+
+static int tegra_io_rail_prepare(int id, unsigned long *request,
+ unsigned long *status, unsigned int *bit)
+{
+ unsigned long rate, value;
+ struct clk *clk;
+
+ *bit = id % 32;
+
+ /*
+ * There are two sets of 30 bits to select IO rails, but bits 30 and
+ * 31 are control bits rather than IO rail selection bits.
+ */
+ if (id > 63 || *bit == 30 || *bit == 31)
+ return -EINVAL;
+
+ if (id < 32) {
+ *status = IO_DPD_STATUS;
+ *request = IO_DPD_REQ;
+ } else {
+ *status = IO_DPD2_STATUS;
+ *request = IO_DPD2_REQ;
+ }
+
+ clk = clk_get_sys(NULL, "pclk");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ rate = clk_get_rate(clk);
+ clk_put(clk);
+
+ pmc_write(DPD_SAMPLE_ENABLE, DPD_SAMPLE);
+
+ /* must be at least 200 ns, in APB (PCLK) clock cycles */
+ value = DIV_ROUND_UP(1000000000, rate);
+ value = DIV_ROUND_UP(200, value);
+ pmc_write(value, SEL_DPD_TIM);
+
+ return 0;
+}
+
+static int tegra_io_rail_poll(unsigned long offset, unsigned long mask,
+ unsigned long val, unsigned long timeout)
+{
+ unsigned long value;
+
+ timeout = jiffies + msecs_to_jiffies(timeout);
+
+ while (time_after(timeout, jiffies)) {
+ value = pmc_read(offset);
+ if ((value & mask) == val)
+ return 0;
+
+ usleep_range(250, 1000);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static void tegra_io_rail_unprepare(void)
+{
+ pmc_write(DPD_SAMPLE_DISABLE, DPD_SAMPLE);
+}
+
+int tegra_io_rail_power_on(int id)
+{
+ unsigned long request, status, value;
+ unsigned int bit, mask;
+ int err;
+
+ err = tegra_io_rail_prepare(id, &request, &status, &bit);
+ if (err < 0)
+ return err;
+
+ mask = 1 << bit;
+
+ value = pmc_read(request);
+ value |= mask;
+ value &= ~IO_DPD_REQ_CODE_MASK;
+ value |= IO_DPD_REQ_CODE_OFF;
+ pmc_write(value, request);
+
+ err = tegra_io_rail_poll(status, mask, 0, 250);
+ if (err < 0)
+ return err;
+
+ tegra_io_rail_unprepare();
+
+ return 0;
+}
+
+int tegra_io_rail_power_off(int id)
+{
+ unsigned long request, status, value;
+ unsigned int bit, mask;
+ int err;
+
+ err = tegra_io_rail_prepare(id, &request, &status, &bit);
+ if (err < 0)
+ return err;
+
+ mask = 1 << bit;
+
+ value = pmc_read(request);
+ value |= mask;
+ value &= ~IO_DPD_REQ_CODE_MASK;
+ value |= IO_DPD_REQ_CODE_ON;
+ pmc_write(value, request);
+
+ err = tegra_io_rail_poll(status, mask, mask, 250);
+ if (err < 0)
+ return err;
+
+ tegra_io_rail_unprepare();
+
+ return 0;
+}
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