From e4f50c8d1047e2c3b6fcf9edc22a26469f72eeb7 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Wed, 1 May 2019 14:24:57 -0700 Subject: bus: ti-sysc: Handle devices with no control registers Some interconnect target modules have no module control registers at all, such as d_can on am335x and am437x. The d_can register offset at 0 is CTL register with 0x401 as the default value. I guess I mistook the 0x401 value for a revision register as the value happens to look similar to what the revision registers typically have for other modules. To handle modules with no control registers, we need to improve the ti-sysc driver a bit to bail out with errors on no control registers, and then we can remove the bogus revision registers for d_can. Cc: Sebastian Andrzej Siewior Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 308475ed4b32..b72741668c92 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -660,12 +660,6 @@ static int sysc_check_registers(struct sysc *ddata) nr_regs++; } - if (nr_regs < 1) { - dev_err(ddata->dev, "missing registers\n"); - - return -EINVAL; - } - if (nr_matches > nr_regs) { dev_err(ddata->dev, "overlapping registers: (%i/%i)", nr_regs, nr_matches); @@ -691,12 +685,18 @@ static int sysc_ioremap(struct sysc *ddata) { int size; - size = max3(ddata->offsets[SYSC_REVISION], - ddata->offsets[SYSC_SYSCONFIG], - ddata->offsets[SYSC_SYSSTATUS]); + if (ddata->offsets[SYSC_REVISION] < 0 && + ddata->offsets[SYSC_SYSCONFIG] < 0 && + ddata->offsets[SYSC_SYSSTATUS] < 0) { + size = ddata->module_size; + } else { + size = max3(ddata->offsets[SYSC_REVISION], + ddata->offsets[SYSC_SYSCONFIG], + ddata->offsets[SYSC_SYSSTATUS]); - if (size < 0 || (size + sizeof(u32)) > ddata->module_size) - return -EINVAL; + if ((size + sizeof(u32)) > ddata->module_size) + return -EINVAL; + } ddata->module_va = devm_ioremap(ddata->dev, ddata->module_pa, @@ -1128,7 +1128,6 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { SYSC_QUIRK("cpgmac", 0, 0x1200, 0x1208, 0x1204, 0x4edb1902, 0xffff00f0, 0), SYSC_QUIRK("dcan", 0, 0, -1, -1, 0xffffffff, 0xffffffff, 0), - SYSC_QUIRK("dcan", 0, 0, -1, -1, 0x00001401, 0xffffffff, 0), SYSC_QUIRK("dmic", 0, 0, 0x10, -1, 0x50010000, 0xffffffff, 0), SYSC_QUIRK("dwc3", 0, 0, 0x10, -1, 0x500a0200, 0xffffffff, 0), SYSC_QUIRK("epwmss", 0, 0, 0x4, -1, 0x47400001, 0xffffffff, 0), -- cgit v1.2.3 From 2b2f7def058a5386838ef4dba70a860285f79e66 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:53 -0700 Subject: bus: ti-sysc: Add support for missing clockdomain handling We need to let ti-sysc driver manage clockdomain autoidle for the duration of of reset, enable and idle. And we need to do it before we enable the clock and after we disable it. Currently we are still relying on platform callbacks indirectly managing clockdomain autoidle. But I noticed that for device tree only probed drivers it now happens only after we enabling the clocks and before we disable the clocks, while it should be the other way around. So far I have not noticed any issues with this though. Let's add new ti_sysc_clkdm_deny_idle() and ti_sysc_clkdm_allow_idle() functions for ti-sysc driver to use to manage clockdomains directly via platform data callbacks. Note that we can implement the clockdomain functions in pdata-quirks.c as for probing devices without "ti,hwmods" custom property we don't need to use the other platform data callbacks. Let's do this in one patch as there's is still an unlikely chance we may need to apply this as a fix for v5.2 for dropping legacy platform data for some devices. We also do have the option of adding back the platform data if needed in case of trouble. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 127 +++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 101 insertions(+), 26 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index b72741668c92..e86f7850206a 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -422,6 +422,30 @@ static void sysc_disable_opt_clocks(struct sysc *ddata) } } +static void sysc_clkdm_deny_idle(struct sysc *ddata) +{ + struct ti_sysc_platform_data *pdata; + + if (ddata->legacy_mode) + return; + + pdata = dev_get_platdata(ddata->dev); + if (pdata && pdata->clkdm_deny_idle) + pdata->clkdm_deny_idle(ddata->dev, &ddata->cookie); +} + +static void sysc_clkdm_allow_idle(struct sysc *ddata) +{ + struct ti_sysc_platform_data *pdata; + + if (ddata->legacy_mode) + return; + + pdata = dev_get_platdata(ddata->dev); + if (pdata && pdata->clkdm_allow_idle) + pdata->clkdm_allow_idle(ddata->dev, &ddata->cookie); +} + /** * sysc_init_resets - init rstctrl reset line if configured * @ddata: device driver data @@ -795,6 +819,7 @@ static void sysc_show_registers(struct sysc *ddata) #define SYSC_IDLE_MASK (SYSC_NR_IDLEMODES - 1) +/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */ static int sysc_enable_module(struct device *dev) { struct sysc *ddata; @@ -805,11 +830,6 @@ static int sysc_enable_module(struct device *dev) if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV) return 0; - /* - * TODO: Need to prevent clockdomain autoidle? - * See clkdm_deny_idle() in arch/mach-omap2/omap_hwmod.c - */ - regbits = ddata->cap->regbits; reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]); @@ -861,6 +881,7 @@ static int sysc_best_idle_mode(u32 idlemodes, u32 *best_mode) return 0; } +/* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */ static int sysc_disable_module(struct device *dev) { struct sysc *ddata; @@ -872,11 +893,6 @@ static int sysc_disable_module(struct device *dev) if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV) return 0; - /* - * TODO: Need to prevent clockdomain autoidle? - * See clkdm_deny_idle() in arch/mach-omap2/omap_hwmod.c - */ - regbits = ddata->cap->regbits; reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]); @@ -966,14 +982,16 @@ static int __maybe_unused sysc_runtime_suspend(struct device *dev) if (!ddata->enabled) return 0; + sysc_clkdm_deny_idle(ddata); + if (ddata->legacy_mode) { error = sysc_runtime_suspend_legacy(dev, ddata); if (error) - return error; + goto err_allow_idle; } else { error = sysc_disable_module(dev); if (error) - return error; + goto err_allow_idle; } sysc_disable_main_clocks(ddata); @@ -983,6 +1001,9 @@ static int __maybe_unused sysc_runtime_suspend(struct device *dev) ddata->enabled = false; +err_allow_idle: + sysc_clkdm_allow_idle(ddata); + return error; } @@ -996,10 +1017,12 @@ static int __maybe_unused sysc_runtime_resume(struct device *dev) if (ddata->enabled) return 0; + sysc_clkdm_deny_idle(ddata); + if (sysc_opt_clks_needed(ddata)) { error = sysc_enable_opt_clocks(ddata); if (error) - return error; + goto err_allow_idle; } error = sysc_enable_main_clocks(ddata); @@ -1018,6 +1041,8 @@ static int __maybe_unused sysc_runtime_resume(struct device *dev) ddata->enabled = true; + sysc_clkdm_allow_idle(ddata); + return 0; err_main_clocks: @@ -1025,6 +1050,8 @@ err_main_clocks: err_opt_clocks: if (sysc_opt_clks_needed(ddata)) sysc_disable_opt_clocks(ddata); +err_allow_idle: + sysc_clkdm_allow_idle(ddata); return error; } @@ -1245,6 +1272,33 @@ static void sysc_init_revision_quirks(struct sysc *ddata) } } +static int sysc_clockdomain_init(struct sysc *ddata) +{ + struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev); + struct clk *fck = NULL, *ick = NULL; + int error; + + if (!pdata || !pdata->init_clockdomain) + return 0; + + switch (ddata->nr_clocks) { + case 2: + ick = ddata->clocks[SYSC_ICK]; + /* fallthrough */ + case 1: + fck = ddata->clocks[SYSC_FCK]; + break; + case 0: + return 0; + } + + error = pdata->init_clockdomain(ddata->dev, fck, ick, &ddata->cookie); + if (!error || error == -ENODEV) + return 0; + + return error; +} + /* * Note that pdata->init_module() typically does a reset first. After * pdata->init_module() is done, PM runtime can be used for the interconnect @@ -1255,7 +1309,7 @@ static int sysc_legacy_init(struct sysc *ddata) struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev); int error; - if (!ddata->legacy_mode || !pdata || !pdata->init_module) + if (!pdata || !pdata->init_module) return 0; error = pdata->init_module(ddata->dev, ddata->mdata, &ddata->cookie); @@ -1347,7 +1401,13 @@ static int sysc_init_module(struct sysc *ddata) (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT)) manage_clocks = false; + error = sysc_clockdomain_init(ddata); + if (error) + return error; + if (manage_clocks) { + sysc_clkdm_deny_idle(ddata); + error = sysc_enable_opt_clocks(ddata); if (error) return error; @@ -1360,20 +1420,33 @@ static int sysc_init_module(struct sysc *ddata) ddata->revision = sysc_read_revision(ddata); sysc_init_revision_quirks(ddata); - error = sysc_legacy_init(ddata); - if (error) - goto err_main_clocks; + if (ddata->legacy_mode) { + error = sysc_legacy_init(ddata); + if (error) + goto err_main_clocks; + } + + if (!ddata->legacy_mode && manage_clocks) { + error = sysc_enable_module(ddata->dev); + if (error) + goto err_main_clocks; + } error = sysc_reset(ddata); if (error) dev_err(ddata->dev, "Reset failed with %d\n", error); + if (!ddata->legacy_mode && manage_clocks) + sysc_disable_module(ddata->dev); + err_main_clocks: if (manage_clocks) sysc_disable_main_clocks(ddata); err_opt_clocks: - if (manage_clocks) + if (manage_clocks) { sysc_disable_opt_clocks(ddata); + sysc_clkdm_allow_idle(ddata); + } return error; } @@ -2012,20 +2085,22 @@ static int sysc_init_pdata(struct sysc *ddata) struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev); struct ti_sysc_module_data *mdata; - if (!pdata || !ddata->legacy_mode) + if (!pdata) return 0; mdata = devm_kzalloc(ddata->dev, sizeof(*mdata), GFP_KERNEL); if (!mdata) return -ENOMEM; - mdata->name = ddata->legacy_mode; - mdata->module_pa = ddata->module_pa; - mdata->module_size = ddata->module_size; - mdata->offsets = ddata->offsets; - mdata->nr_offsets = SYSC_MAX_REGS; - mdata->cap = ddata->cap; - mdata->cfg = &ddata->cfg; + if (ddata->legacy_mode) { + mdata->name = ddata->legacy_mode; + mdata->module_pa = ddata->module_pa; + mdata->module_size = ddata->module_size; + mdata->offsets = ddata->offsets; + mdata->nr_offsets = SYSC_MAX_REGS; + mdata->cap = ddata->cap; + mdata->cfg = &ddata->cfg; + } ddata->mdata = mdata; -- cgit v1.2.3 From 5aa912953611e5ec2443d97713ee55730dc2afdc Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:53 -0700 Subject: bus: ti-sysc: Support 16-bit writes too We need to also support 16-bit writes for i2c in addition to the reads when we start configuring the sysconfig register for reset and idle modes. Note that only i2c revision register has LO and HI registers, so let's add a check also for 16-bit register read. This change is currently cosmetic and does not affect anything until we enable the module specific quirk handling for i2c reset and enable later on. Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index e86f7850206a..f00997eea207 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -100,6 +100,20 @@ static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np, static void sysc_write(struct sysc *ddata, int offset, u32 value) { + if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) { + writew_relaxed(value & 0xffff, ddata->module_va + offset); + + /* Only i2c revision has LO and HI register with stride of 4 */ + if (ddata->offsets[SYSC_REVISION] >= 0 && + offset == ddata->offsets[SYSC_REVISION]) { + u16 hi = value >> 16; + + writew_relaxed(hi, ddata->module_va + offset + 4); + } + + return; + } + writel_relaxed(value, ddata->module_va + offset); } @@ -109,7 +123,14 @@ static u32 sysc_read(struct sysc *ddata, int offset) u32 val; val = readw_relaxed(ddata->module_va + offset); - val |= (readw_relaxed(ddata->module_va + offset + 4) << 16); + + /* Only i2c revision has LO and HI register with stride of 4 */ + if (ddata->offsets[SYSC_REVISION] >= 0 && + offset == ddata->offsets[SYSC_REVISION]) { + u16 tmp = readw_relaxed(ddata->module_va + offset + 4); + + val |= tmp << 16; + } return val; } -- cgit v1.2.3 From e0db94fe87dacd72be0699adcc29e321db7f1689 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:53 -0700 Subject: bus: ti-sysc: Make OCP reset work for sysstatus and sysconfig reset bits We've had minimal OCP softreset support in ti-sysc interconnect target module driver only used for MCAN driver so far. But it turns out that MCAN has the sysstatus register resetdone bit inverted compared to most other modules. Let's make OCP softreset work for other typical cases with reset status in sysstatus or sysconfig register so we can use the new functions for sysc_enable_module() and sysc_disable_module() without "ti,hwmods" property in the following patches. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 72 ++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 54 insertions(+), 18 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index f00997eea207..f4a048430cd1 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -153,6 +153,26 @@ static u32 sysc_read_revision(struct sysc *ddata) return sysc_read(ddata, offset); } +static u32 sysc_read_sysconfig(struct sysc *ddata) +{ + int offset = ddata->offsets[SYSC_SYSCONFIG]; + + if (offset < 0) + return 0; + + return sysc_read(ddata, offset); +} + +static u32 sysc_read_sysstatus(struct sysc *ddata) +{ + int offset = ddata->offsets[SYSC_SYSSTATUS]; + + if (offset < 0) + return 0; + + return sysc_read(ddata, offset); +} + static int sysc_add_named_clock_from_child(struct sysc *ddata, const char *name, const char *optfck_name) @@ -1369,34 +1389,49 @@ static int sysc_rstctrl_reset_deassert(struct sysc *ddata, bool reset) return reset_control_deassert(ddata->rsts); } +/* + * Note that the caller must ensure the interconnect target module is enabled + * before calling reset. Otherwise reset will not complete. + */ static int sysc_reset(struct sysc *ddata) { - int offset = ddata->offsets[SYSC_SYSCONFIG]; - int val; + int sysc_offset, syss_offset, sysc_val, rstval, quirks, error = 0; + u32 sysc_mask, syss_done; + + sysc_offset = ddata->offsets[SYSC_SYSCONFIG]; + syss_offset = ddata->offsets[SYSC_SYSSTATUS]; + quirks = ddata->cfg.quirks; - if (ddata->legacy_mode || offset < 0 || + if (ddata->legacy_mode || sysc_offset < 0 || + ddata->cap->regbits->srst_shift < 0 || ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT) return 0; - /* - * Currently only support reset status in sysstatus. - * Warn and return error in all other cases - */ - if (!ddata->cfg.syss_mask) { - dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n"); - return -EINVAL; - } + sysc_mask = BIT(ddata->cap->regbits->srst_shift); - val = sysc_read(ddata, offset); - val |= (0x1 << ddata->cap->regbits->srst_shift); - sysc_write(ddata, offset, val); + if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED) + syss_done = 0; + else + syss_done = ddata->cfg.syss_mask; + + sysc_val = sysc_read_sysconfig(ddata); + sysc_val |= sysc_mask; + sysc_write(ddata, sysc_offset, sysc_val); /* Poll on reset status */ - offset = ddata->offsets[SYSC_SYSSTATUS]; + if (syss_offset >= 0) { + error = readx_poll_timeout(sysc_read_sysstatus, ddata, rstval, + (rstval & ddata->cfg.syss_mask) == + syss_done, + 100, MAX_MODULE_SOFTRESET_WAIT); + + } else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) { + error = readx_poll_timeout(sysc_read_sysconfig, ddata, rstval, + !(rstval & sysc_mask), + 100, MAX_MODULE_SOFTRESET_WAIT); + } - return readl_poll_timeout(ddata->module_va + offset, val, - (val & ddata->cfg.syss_mask) == 0x0, - 100, MAX_MODULE_SOFTRESET_WAIT); + return error; } /* @@ -2099,6 +2134,7 @@ static const struct sysc_capabilities sysc_dra7_mcan = { .type = TI_SYSC_DRA7_MCAN, .sysc_mask = SYSC_DRA7_MCAN_ENAWAKEUP | SYSC_OMAP4_SOFTRESET, .regbits = &sysc_regbits_dra7_mcan, + .mod_quirks = SYSS_QUIRK_RESETDONE_INVERTED, }; static int sysc_init_pdata(struct sysc *ddata) -- cgit v1.2.3 From bd808f9a442301e493fe0bb3168774b4da7bb605 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:54 -0700 Subject: bus: ti-sysc: Allow QUIRK_LEGACY_IDLE even if legacy_mode is not set We need to specify QUIRK_LEGACY_IDLE for device drivers that still have pm_runtime_irq_safe() set like 8250. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index f4a048430cd1..412973829adc 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -1792,9 +1792,6 @@ static struct dev_pm_domain sysc_child_pm_domain = { */ static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child) { - if (!ddata->legacy_mode) - return; - if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE) dev_pm_domain_set(child, &sysc_child_pm_domain); } -- cgit v1.2.3 From eec26555ae9bf69da8bfe90cacdbc85d7a23391b Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:54 -0700 Subject: bus: ti-sysc: Enable interconnect target module autoidle bit on enable For interconnect target modules with autoidle bit wired, we need to manage it for enable and disable. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 412973829adc..46a8eb469cb2 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -893,7 +893,7 @@ set_midle: /* Set MIDLE mode */ idlemodes = ddata->cfg.midlemodes; if (!idlemodes || regbits->midle_shift < 0) - return 0; + goto set_autoidle; best_mode = fls(ddata->cfg.midlemodes) - 1; if (best_mode > SYSC_IDLE_MASK) { @@ -905,6 +905,14 @@ set_midle: reg |= best_mode << regbits->midle_shift; sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg); +set_autoidle: + /* Autoidle bit must enabled separately if available */ + if (regbits->autoidle_shift >= 0 && + ddata->cfg.sysc_val & BIT(regbits->autoidle_shift)) { + reg |= 1 << regbits->autoidle_shift; + sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg); + } + return 0; } @@ -966,6 +974,9 @@ set_sidle: reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift); reg |= best_mode << regbits->sidle_shift; + if (regbits->autoidle_shift >= 0 && + ddata->cfg.sysc_val & BIT(regbits->autoidle_shift)) + reg |= 1 << regbits->autoidle_shift; sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg); return 0; -- cgit v1.2.3 From ae9ae12e9daa1e2139c3ff729d60f3c16d6e9b61 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:54 -0700 Subject: bus: ti-sysc: Handle clockactivity for enable and disable Modules with clockactivity need it configured during enable. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 46a8eb469cb2..31035492f1be 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -859,6 +859,7 @@ static void sysc_show_registers(struct sysc *ddata) } #define SYSC_IDLE_MASK (SYSC_NR_IDLEMODES - 1) +#define SYSC_CLOCACT_ICK 2 /* Caller needs to manage sysc_clkdm_deny_idle() and sysc_clkdm_allow_idle() */ static int sysc_enable_module(struct device *dev) @@ -874,6 +875,12 @@ static int sysc_enable_module(struct device *dev) regbits = ddata->cap->regbits; reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]); + /* Set CLOCKACTIVITY, we only use it for ick */ + if (regbits->clkact_shift >= 0 && + (ddata->cfg.quirks & SYSC_QUIRK_USE_CLOCKACT || + ddata->cfg.sysc_val & BIT(regbits->clkact_shift))) + reg |= SYSC_CLOCACT_ICK << regbits->clkact_shift; + /* Set SIDLE mode */ idlemodes = ddata->cfg.sidlemodes; if (!idlemodes || regbits->sidle_shift < 0) -- cgit v1.2.3 From fb685f1c190ec8c085e499f138752b2b0a2836de Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:55 -0700 Subject: bus: ti-sysc: Handle swsup idle mode quirks Some modules have idlemodes wired, but not completely functional. We have quirks for SWSUP_SIDLE and SWSUP_SIDLE_ACT to manage interconnect target modules without hardware support, but we've been only using them so far in legacy mode. Let's add support for SWSUP quirks in non-legacy mode too. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 31035492f1be..4a0146424902 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -886,10 +886,15 @@ static int sysc_enable_module(struct device *dev) if (!idlemodes || regbits->sidle_shift < 0) goto set_midle; - best_mode = fls(ddata->cfg.sidlemodes) - 1; - if (best_mode > SYSC_IDLE_MASK) { - dev_err(dev, "%s: invalid sidlemode\n", __func__); - return -EINVAL; + if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_SIDLE | + SYSC_QUIRK_SWSUP_SIDLE_ACT)) { + best_mode = SYSC_IDLE_NO; + } else { + best_mode = fls(ddata->cfg.sidlemodes) - 1; + if (best_mode > SYSC_IDLE_MASK) { + dev_err(dev, "%s: invalid sidlemode\n", __func__); + return -EINVAL; + } } reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift); @@ -973,10 +978,14 @@ set_sidle: if (!idlemodes || regbits->sidle_shift < 0) return 0; - ret = sysc_best_idle_mode(idlemodes, &best_mode); - if (ret) { - dev_err(dev, "%s: invalid sidlemode\n", __func__); - return ret; + if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE) { + best_mode = SYSC_IDLE_FORCE; + } else { + ret = sysc_best_idle_mode(idlemodes, &best_mode); + if (ret) { + dev_err(dev, "%s: invalid sidlemode\n", __func__); + return ret; + } } reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift); -- cgit v1.2.3 From 6e09f497eb911c61fc8dde04ce8482fc2615355e Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:55 -0700 Subject: bus: ti-sysc: Set ENAWAKEUP if available Some modules have ENAWAKEUP bit that we need to configure when not relying on platform data callbacks. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 4a0146424902..38573f9b4fdc 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -895,6 +895,11 @@ static int sysc_enable_module(struct device *dev) dev_err(dev, "%s: invalid sidlemode\n", __func__); return -EINVAL; } + + /* Set WAKEUP */ + if (regbits->enwkup_shift >= 0 && + ddata->cfg.sysc_val & BIT(regbits->enwkup_shift)) + reg |= BIT(regbits->enwkup_shift); } reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift); -- cgit v1.2.3 From 8383e25994efadbd76cf6db7b19776cb8931e5da Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:56 -0700 Subject: bus: ti-sysc: Add support for disabling module without legacy mode We must not assert reset for modules with no child device drivers until in runtime_suspend. Otherwise register access will fail without legacy mode helping us. Let's add a flag for disable_on_idle and move the reset driver handling to runtime suspend and resume. We can then also use the disable_on_idle flag to reconfigure sysconfig register for PM modes requesting it. Let's also make the other flags use bitfield while at it instead of bool. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 38573f9b4fdc..f36f3e8b38f3 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -89,9 +89,10 @@ struct sysc { struct ti_sysc_cookie cookie; const char *name; u32 revision; - bool enabled; - bool needs_resume; - bool child_needs_resume; + unsigned int enabled:1; + unsigned int needs_resume:1; + unsigned int child_needs_resume:1; + unsigned int disable_on_idle:1; struct delayed_work idle_work; }; @@ -1021,6 +1022,9 @@ static int __maybe_unused sysc_runtime_suspend_legacy(struct device *dev, dev_err(dev, "%s: could not idle: %i\n", __func__, error); + if (ddata->disable_on_idle) + reset_control_assert(ddata->rsts); + return 0; } @@ -1030,6 +1034,9 @@ static int __maybe_unused sysc_runtime_resume_legacy(struct device *dev, struct ti_sysc_platform_data *pdata; int error; + if (ddata->disable_on_idle) + reset_control_deassert(ddata->rsts); + pdata = dev_get_platdata(ddata->dev); if (!pdata) return 0; @@ -1077,6 +1084,9 @@ static int __maybe_unused sysc_runtime_suspend(struct device *dev) err_allow_idle: sysc_clkdm_allow_idle(ddata); + if (ddata->disable_on_idle) + reset_control_assert(ddata->rsts); + return error; } @@ -1090,6 +1100,9 @@ static int __maybe_unused sysc_runtime_resume(struct device *dev) if (ddata->enabled) return 0; + if (ddata->disable_on_idle) + reset_control_deassert(ddata->rsts); + sysc_clkdm_deny_idle(ddata); if (sysc_opt_clks_needed(ddata)) { @@ -2306,7 +2319,7 @@ static int sysc_probe(struct platform_device *pdev) } if (!of_get_available_child_count(ddata->dev->of_node)) - reset_control_assert(ddata->rsts); + ddata->disable_on_idle = true; return 0; -- cgit v1.2.3 From ea5a2e4d54675b06991ef3452e8e51ce6519a8db Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:56 -0700 Subject: bus: ti-sysc: Do rstctrl reset handling in two phases We need to deassert rstctrl resets before enabling clocks to avoid clock "failed to enable" errors. For asserting rstctrl reset, the clocks need to be enabled. As the reset controller status is not available for arrays, let's use devm_reset_control_get_optional() so we can get the status after reset. Note that depends on a proper PRM rstctrl driver, so far I've only tested this with earlier reset-simple patches. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index f36f3e8b38f3..bc4dbaa027cf 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -497,7 +497,7 @@ static void sysc_clkdm_allow_idle(struct sysc *ddata) static int sysc_init_resets(struct sysc *ddata) { ddata->rsts = - devm_reset_control_array_get_optional_exclusive(ddata->dev); + devm_reset_control_get_optional(ddata->dev, "rstctrl"); if (IS_ERR(ddata->rsts)) return PTR_ERR(ddata->rsts); @@ -1420,7 +1420,7 @@ static int sysc_legacy_init(struct sysc *ddata) */ static int sysc_rstctrl_reset_deassert(struct sysc *ddata, bool reset) { - int error; + int error, val; if (!ddata->rsts) return 0; @@ -1431,7 +1431,14 @@ static int sysc_rstctrl_reset_deassert(struct sysc *ddata, bool reset) return error; } - return reset_control_deassert(ddata->rsts); + error = reset_control_deassert(ddata->rsts); + if (error == -EEXIST) + return 0; + + error = readx_poll_timeout(reset_control_status, ddata->rsts, val, + val == 0, 100, MAX_MODULE_SOFTRESET_WAIT); + + return error; } /* @@ -1489,12 +1496,8 @@ static int sysc_init_module(struct sysc *ddata) { int error = 0; bool manage_clocks = true; - bool reset = true; - if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT) - reset = false; - - error = sysc_rstctrl_reset_deassert(ddata, reset); + error = sysc_rstctrl_reset_deassert(ddata, false); if (error) return error; @@ -1518,6 +1521,12 @@ static int sysc_init_module(struct sysc *ddata) goto err_opt_clocks; } + if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)) { + error = sysc_rstctrl_reset_deassert(ddata, true); + if (error) + goto err_main_clocks; + } + ddata->revision = sysc_read_revision(ddata); sysc_init_revision_quirks(ddata); -- cgit v1.2.3 From b6a53c4c872ab6870eb455d10a6f7ff0d99b1b1f Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 27 May 2019 04:51:57 -0700 Subject: bus: ti-sysc: Detect uarts also on omap34xx Looks like we currently only detect UART on omap36xx, let's also add support for omap34xx. And let's also fix the SWSUP mode, it should be SWSUP_SIDLE for omap3, not SWSUP_SIDLE_ACT like for omap4 and later. Note that we are still booting omap3 for most part without ti-sysc, so no need to treat this change as a fix. Tested-by: Keerthy Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index bc4dbaa027cf..a366ae548ec9 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -1219,8 +1219,10 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { 0), SYSC_QUIRK("timer", 0, 0, 0x10, -1, 0x4fff1301, 0xffff00ff, 0), + SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff, + SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE), SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff, - SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE), /* Uarts on omap4 and later */ SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff, SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE), -- cgit v1.2.3 From 4e23be473e3063a9d3bc06bb0aee89885fffab0e Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 10 Jun 2019 04:48:05 -0700 Subject: bus: ti-sysc: Add support for module specific reset quirks Some older interconnect target modules need module internal clock toggling quirks to reset properly. We've been doing this in the platform code earlier, but need to be able to it directly in the ti-sysc driver when we no longer rely on on the platform code. Let's add reset handling for 1-wire, i2c and watchdog. Later on we can add more modules like msdi and dss as they get tested. For dra7 pcie, we should be able to just use the rstctrl reset driver when available. Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 124 insertions(+), 5 deletions(-) (limited to 'drivers/bus') diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index a366ae548ec9..e6deabd8305d 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -71,6 +71,9 @@ static const char * const clock_names[SYSC_MAX_CLOCKS] = { * @name: name if available * @revision: interconnect target module revision * @needs_resume: runtime resume needed on resume from suspend + * @clk_enable_quirk: module specific clock enable quirk + * @clk_disable_quirk: module specific clock disable quirk + * @reset_done_quirk: module specific reset done quirk */ struct sysc { struct device *dev; @@ -94,6 +97,9 @@ struct sysc { unsigned int child_needs_resume:1; unsigned int disable_on_idle:1; struct delayed_work idle_work; + void (*clk_enable_quirk)(struct sysc *sysc); + void (*clk_disable_quirk)(struct sysc *sysc); + void (*reset_done_quirk)(struct sysc *sysc); }; static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np, @@ -760,8 +766,11 @@ static int sysc_ioremap(struct sysc *ddata) ddata->offsets[SYSC_SYSCONFIG], ddata->offsets[SYSC_SYSSTATUS]); + if (size < SZ_1K) + size = SZ_1K; + if ((size + sizeof(u32)) > ddata->module_size) - return -EINVAL; + size = ddata->module_size; } ddata->module_va = devm_ioremap(ddata->dev, @@ -1234,6 +1243,22 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { SYSC_QUIRK_EXT_OPT_CLOCK | SYSC_QUIRK_NO_RESET_ON_INIT | SYSC_QUIRK_SWSUP_SIDLE), + /* Quirks that need to be set based on detected module */ + SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff, + SYSC_MODULE_QUIRK_HDQ1W), + SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff, + SYSC_MODULE_QUIRK_HDQ1W), + SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000036, 0x000000ff, + SYSC_MODULE_QUIRK_I2C), + SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x0000003c, 0x000000ff, + SYSC_MODULE_QUIRK_I2C), + SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000040, 0x000000ff, + SYSC_MODULE_QUIRK_I2C), + SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0, + SYSC_MODULE_QUIRK_I2C), + SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0, + SYSC_MODULE_QUIRK_WDT), + #ifdef DEBUG SYSC_QUIRK("adc", 0, 0, 0x10, -1, 0x47300001, 0xffffffff, 0), SYSC_QUIRK("atl", 0, 0, -1, -1, 0x0a070100, 0xffffffff, 0), @@ -1247,11 +1272,8 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { SYSC_QUIRK("dwc3", 0, 0, 0x10, -1, 0x500a0200, 0xffffffff, 0), SYSC_QUIRK("epwmss", 0, 0, 0x4, -1, 0x47400001, 0xffffffff, 0), SYSC_QUIRK("gpu", 0, 0x1fc00, 0x1fc10, -1, 0, 0, 0), - SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff, 0), - SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff, 0), SYSC_QUIRK("hsi", 0, 0, 0x10, 0x14, 0x50043101, 0xffffffff, 0), SYSC_QUIRK("iss", 0, 0, 0x10, -1, 0x40000101, 0xffffffff, 0), - SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0, 0), SYSC_QUIRK("lcdc", 0, 0, 0x54, -1, 0x4f201000, 0xffffffff, 0), SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44306302, 0xffffffff, 0), SYSC_QUIRK("mcasp", 0, 0, 0x4, -1, 0x44307b02, 0xffffffff, 0), @@ -1287,7 +1309,6 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, -1, 0x50700101, 0xffffffff, 0), SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050, 0xffffffff, 0), - SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0, 0), SYSC_QUIRK("vfpe", 0, 0, 0x104, -1, 0x4d001200, 0xffffffff, 0), #endif }; @@ -1360,6 +1381,94 @@ static void sysc_init_revision_quirks(struct sysc *ddata) } } +/* 1-wire needs module's internal clocks enabled for reset */ +static void sysc_clk_enable_quirk_hdq1w(struct sysc *ddata) +{ + int offset = 0x0c; /* HDQ_CTRL_STATUS */ + u16 val; + + val = sysc_read(ddata, offset); + val |= BIT(5); + sysc_write(ddata, offset, val); +} + +/* I2C needs extra enable bit toggling for reset */ +static void sysc_clk_quirk_i2c(struct sysc *ddata, bool enable) +{ + int offset; + u16 val; + + /* I2C_CON, omap2/3 is different from omap4 and later */ + if ((ddata->revision & 0xffffff00) == 0x001f0000) + offset = 0x24; + else + offset = 0xa4; + + /* I2C_EN */ + val = sysc_read(ddata, offset); + if (enable) + val |= BIT(15); + else + val &= ~BIT(15); + sysc_write(ddata, offset, val); +} + +static void sysc_clk_enable_quirk_i2c(struct sysc *ddata) +{ + sysc_clk_quirk_i2c(ddata, true); +} + +static void sysc_clk_disable_quirk_i2c(struct sysc *ddata) +{ + sysc_clk_quirk_i2c(ddata, false); +} + +/* Watchdog timer needs a disable sequence after reset */ +static void sysc_reset_done_quirk_wdt(struct sysc *ddata) +{ + int wps, spr, error; + u32 val; + + wps = 0x34; + spr = 0x48; + + sysc_write(ddata, spr, 0xaaaa); + error = readl_poll_timeout(ddata->module_va + wps, val, + !(val & 0x10), 100, + MAX_MODULE_SOFTRESET_WAIT); + if (error) + dev_warn(ddata->dev, "wdt disable spr failed\n"); + + sysc_write(ddata, wps, 0x5555); + error = readl_poll_timeout(ddata->module_va + wps, val, + !(val & 0x10), 100, + MAX_MODULE_SOFTRESET_WAIT); + if (error) + dev_warn(ddata->dev, "wdt disable wps failed\n"); +} + +static void sysc_init_module_quirks(struct sysc *ddata) +{ + if (ddata->legacy_mode || !ddata->name) + return; + + if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_HDQ1W) { + ddata->clk_enable_quirk = sysc_clk_enable_quirk_hdq1w; + + return; + } + + if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_I2C) { + ddata->clk_enable_quirk = sysc_clk_enable_quirk_i2c; + ddata->clk_disable_quirk = sysc_clk_disable_quirk_i2c; + + return; + } + + if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_WDT) + ddata->reset_done_quirk = sysc_reset_done_quirk_wdt; +} + static int sysc_clockdomain_init(struct sysc *ddata) { struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev); @@ -1468,10 +1577,16 @@ static int sysc_reset(struct sysc *ddata) else syss_done = ddata->cfg.syss_mask; + if (ddata->clk_disable_quirk) + ddata->clk_disable_quirk(ddata); + sysc_val = sysc_read_sysconfig(ddata); sysc_val |= sysc_mask; sysc_write(ddata, sysc_offset, sysc_val); + if (ddata->clk_enable_quirk) + ddata->clk_enable_quirk(ddata); + /* Poll on reset status */ if (syss_offset >= 0) { error = readx_poll_timeout(sysc_read_sysstatus, ddata, rstval, @@ -1485,6 +1600,9 @@ static int sysc_reset(struct sysc *ddata) 100, MAX_MODULE_SOFTRESET_WAIT); } + if (ddata->reset_done_quirk) + ddata->reset_done_quirk(ddata); + return error; } @@ -1531,6 +1649,7 @@ static int sysc_init_module(struct sysc *ddata) ddata->revision = sysc_read_revision(ddata); sysc_init_revision_quirks(ddata); + sysc_init_module_quirks(ddata); if (ddata->legacy_mode) { error = sysc_legacy_init(ddata); -- cgit v1.2.3