Some MediaTek platforms with a buggy TrustZone ATF firmware will not
initialize the AArch64 System Timer correctly: in these cases, the
System Timer address is correctly programmed, as well as the CNTFRQ_EL0
register (reading 13MHz, as it should be), but the assigned hardware
timers are never started before (or after) booting Linux.
In this condition, any call to function get_cycles() will be returning
zero, as CNTVCT_EL0 will always read zero.
One common critical symptom of that is trying to use the udelay()
function (calling __delay()), which executes the following loop:
start = get_cycles();
while ((get_cycles() - start) < cycles)
cpu_relax();
which, when CNTVCT_EL0 always reads zero, translates to:
while((0 - 0) < 0) ==> while(0 < 0)
... generating an infinite loop, even though zero is never less
than zero, but always equal to it (this has to be researched,
but it's out of the scope of this commit).
To fix this issue on the affected MediaTek platforms, the solution
is to simply start the timers that are designed to be System Timer(s).
These timers, downstream, are called "CPUXGPT" and there is one
timer per CPU core; luckily, it is not necessary to set a start bit
on each CPUX General Purpose Timer, but it's conveniently enough to:
- Set the clock divider (input = 26MHz, divider = 2, output = 13MHz);
- Set the ENABLE bit on a global register (starts all CPUX timers).
The only small hurdle with this setup is that it's all done through
the MCUSYS wrapper, where it is needed, for each read or write, to
select a register address (by writing it to an index register) and
then to perform any R/W on a "CON" register.
For example, writing "0x1" to the CPUXGPT register offset 0x4:
- Write 0x4 to mcusys INDEX register
- Write 0x1 to mcusys CON register
Reading from CPUXGPT register offset 0x4:
- Write 0x4 to mcusys INDEX register
- Read mcusys CON register.
Finally, starting this timer makes platforms affected by this issue
to work correctly.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
drivers/clocksource/timer-mediatek.c | 118 +++++++++++++++++++++++++++
1 file changed, 118 insertions(+)
diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index 7bcb4a3f26fb..52120bba29c4 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c
@@ -22,6 +22,19 @@
#define TIMER_SYNC_TICKS (3)
+/* cpux mcusys wrapper */
+#define CPUX_CON_REG 0x0
+#define CPUX_IDX_REG 0x4
+
+/* cpux */
+#define CPUX_IDX_GLOBAL_CTRL 0x0
+ #define CPUX_ENABLE BIT(0)
+ #define CPUX_CLK_DIV_MASK GENMASK(10, 8)
+ #define CPUX_CLK_DIV1 BIT(8)
+ #define CPUX_CLK_DIV2 BIT(9)
+ #define CPUX_CLK_DIV4 BIT(10)
+#define CPUX_IDX_GLOBAL_IRQ 0x30
+
/* gpt */
#define GPT_IRQ_EN_REG 0x00
#define GPT_IRQ_ENABLE(val) BIT((val) - 1)
@@ -72,6 +85,56 @@
static void __iomem *gpt_sched_reg __read_mostly;
+static u32 mtk_cpux_readl(u32 reg_idx, struct timer_of *to)
+{
+ writel(reg_idx, timer_of_base(to) + CPUX_IDX_REG);
+ return readl(timer_of_base(to) + CPUX_CON_REG);
+}
+
+static void mtk_cpux_writel(u32 val, u32 reg_idx, struct timer_of *to)
+{
+ writel(reg_idx, timer_of_base(to) + CPUX_IDX_REG);
+ writel(val, timer_of_base(to) + CPUX_CON_REG);
+}
+
+static void mtk_cpux_disable_irq(struct timer_of *to)
+{
+ const unsigned long *irq_mask = cpumask_bits(cpu_possible_mask);
+ u32 val;
+
+ val = mtk_cpux_readl(CPUX_IDX_GLOBAL_IRQ, to);
+ val &= ~(*irq_mask);
+}
+
+static void mtk_cpux_enable_irq(struct timer_of *to)
+{
+ const unsigned long *irq_mask = cpumask_bits(cpu_possible_mask);
+ u32 val;
+
+ val = mtk_cpux_readl(CPUX_IDX_GLOBAL_IRQ, to);
+ val |= *irq_mask;
+ mtk_cpux_writel(val, CPUX_IDX_GLOBAL_IRQ, to);
+}
+
+static int mtk_cpux_clkevt_shutdown(struct clock_event_device *clkevt)
+{
+ /* Clear any irq */
+ mtk_cpux_disable_irq(to_timer_of(clkevt));
+
+ /*
+ * Disabling CPUXGPT timer will crash the platform, especially
+ * if Trusted Firmware is using it (usually, for sleep states),
+ * so we only mask the IRQ and call it a day.
+ */
+ return 0;
+}
+
+static int mtk_cpux_clkevt_resume(struct clock_event_device *clkevt)
+{
+ mtk_cpux_enable_irq(to_timer_of(clkevt));
+ return 0;
+}
+
static void mtk_syst_ack_irq(struct timer_of *to)
{
/* Clear and disable interrupt */
@@ -281,6 +344,60 @@ static struct timer_of to = {
},
};
+static int __init mtk_cpux_init(struct device_node *node)
+{
+ static struct timer_of to_cpux;
+ u32 freq, val;
+ int ret;
+
+ /*
+ * There are per-cpu interrupts for the CPUX General Purpose Timer
+ * but since this timer feeds the AArch64 System Timer we can rely
+ * on the CPU timer PPIs as well, so we don't declare TIMER_OF_IRQ.
+ */
+ to_cpux.flags = TIMER_OF_BASE | TIMER_OF_CLOCK;
+ to_cpux.clkevt.name = "mtk-cpuxgpt";
+ to_cpux.clkevt.rating = 10;
+ to_cpux.clkevt.cpumask = cpu_possible_mask;
+ to_cpux.clkevt.set_state_shutdown = mtk_cpux_clkevt_shutdown;
+ to_cpux.clkevt.tick_resume = mtk_cpux_clkevt_resume;
+
+ /* If this fails, bad things are about to happen... */
+ ret = timer_of_init(node, &to_cpux);
+ if (ret) {
+ WARN(1, "Cannot start CPUX timers.\n");
+ return ret;
+ }
+
+ /*
+ * Check if we're given a clock with the right frequency for this
+ * timer, otherwise warn but keep going with the setup anyway, as
+ * that makes it possible to still boot the kernel, even though
+ * it may not work correctly (random lockups, etc).
+ * The reason behind this is that having an early UART may not be
+ * possible for everyone and this gives a chance to retrieve kmsg
+ * for eventual debugging even on consumer devices.
+ */
+ freq = timer_of_rate(&to_cpux);
+ if (freq > 13000000)
+ WARN(1, "Requested unsupported timer frequency %u\n", freq);
+
+ /* Clock input is 26MHz, set DIV2 to achieve 13MHz clock */
+ val = mtk_cpux_readl(CPUX_IDX_GLOBAL_CTRL, &to_cpux);
+ val &= ~CPUX_CLK_DIV_MASK;
+ val |= CPUX_CLK_DIV2;
+ mtk_cpux_writel(val, CPUX_IDX_GLOBAL_CTRL, &to_cpux);
+
+ /* Enable all CPUXGPT timers */
+ val = mtk_cpux_readl(CPUX_IDX_GLOBAL_CTRL, &to_cpux);
+ mtk_cpux_writel(val | CPUX_ENABLE, CPUX_IDX_GLOBAL_CTRL, &to_cpux);
+
+ clockevents_config_and_register(&to_cpux.clkevt, timer_of_rate(&to_cpux),
+ TIMER_SYNC_TICKS, 0xffffffff);
+
+ return 0;
+}
+
static int __init mtk_syst_init(struct device_node *node)
{
int ret;
@@ -339,3 +456,4 @@ static int __init mtk_gpt_init(struct device_node *node)
}
TIMER_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_gpt_init);
TIMER_OF_DECLARE(mtk_mt6765, "mediatek,mt6765-timer", mtk_syst_init);
+TIMER_OF_DECLARE(mtk_mt6795, "mediatek,mt6795-systimer", mtk_cpux_init);
--
2.35.1
Hi AngeloGioacchino, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/timers/core] [also build test WARNING on robh/for-next v5.18-rc6 next-20220509] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/intel-lab-lkp/linux/commits/AngeloGioacchino-Del-Regno/MediaTek-SoC-ARM-ARM64-System-Timer/20220509-182806 base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git f4b62e1e1137507268c2c63dc4e6da279dc58e9f config: mips-randconfig-r015-20220509 (https://download.01.org/0day-ci/archive/20220510/202205100325.mvo9fxmN-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a385645b470e2d3a1534aae618ea56b31177639f) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/cd08992dd0c0e2c02229be62ecb2a51da4c1d315 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review AngeloGioacchino-Del-Regno/MediaTek-SoC-ARM-ARM64-System-Timer/20220509-182806 git checkout cd08992dd0c0e2c02229be62ecb2a51da4c1d315 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/clocksource/ drivers/gpu/drm/mgag200/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> All warnings (new ones prefixed by >>): >> drivers/clocksource/timer-mediatek.c:103:6: warning: variable 'val' set but not used [-Wunused-but-set-variable] u32 val; ^ 1 warning generated. vim +/val +103 drivers/clocksource/timer-mediatek.c 99 100 static void mtk_cpux_disable_irq(struct timer_of *to) 101 { 102 const unsigned long *irq_mask = cpumask_bits(cpu_possible_mask); > 103 u32 val; 104 105 val = mtk_cpux_readl(CPUX_IDX_GLOBAL_IRQ, to); 106 val &= ~(*irq_mask); 107 } 108 -- 0-DAY CI Kernel Test Service https://01.org/lkp
© 2016 - 2024 Red Hat, Inc.