[v10,2/8] ARM: l2c: Refactor the driver to use commit-like interface

Message ID	1419331716-8972-3-git-send-email-m.szyprowski@samsung.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-samsung-soc-owner@kernel.org> From: Marek Szyprowski <m.szyprowski@samsung.com> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Marek Szyprowski <m.szyprowski@samsung.com>, Tomasz Figa <tomasz.figa@gmail.com>, Kyungmin Park <kyungmin.park@samsung.com>, linux-samsung-soc@vger.kernel.org, linux-omap@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>, Russell King - ARM Linux <linux@arm.linux.org.uk>, Kukjin Kim <kgene.kim@samsung.com>, lauraa@codeaurora.org, linus.walleij@linaro.org, tony@atomide.com, drake@endlessm.com, loeliger@gmail.com, Mark Rutland <mark.rutland@arm.com>, nm@ti.com, khilman@linaro.org Subject: [PATCH v10 2/8] ARM: l2c: Refactor the driver to use commit-like interface Date: Tue, 23 Dec 2014 11:48:30 +0100 Message-id: <1419331716-8972-3-git-send-email-m.szyprowski@samsung.com> In-reply-to: <1419331716-8972-1-git-send-email-m.szyprowski@samsung.com> References: <1419331716-8972-1-git-send-email-m.szyprowski@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index 5e65ca8dea62..e5948c5adaa7 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -41,12 +41,14 @@ struct l2c_init_data { void (*enable)(void __iomem *, u32, unsigned); void (*fixup)(void __iomem *, u32, struct outer_cache_fns *); void (*save)(void __iomem *); + void (*configure)(void __iomem *); struct outer_cache_fns outer_cache; }; #define CACHE_LINE_SIZE 32 static void __iomem *l2x0_base; +static const struct l2c_init_data *l2x0_data; static DEFINE_RAW_SPINLOCK(l2x0_lock); static u32 l2x0_way_mask; /* Bitmask of active ways */ static u32 l2x0_size; @@ -106,6 +108,14 @@ static inline void l2c_unlock(void __iomem *base, unsigned num) } } +static void l2c_configure(void __iomem *base) +{ + if (l2x0_data->configure) + l2x0_data->configure(base); + + l2c_write_sec(l2x0_saved_regs.aux_ctrl, base, L2X0_AUX_CTRL); +} + /* * Enable the L2 cache controller. This function must only be * called when the cache controller is known to be disabled. @@ -114,7 +124,12 @@ static void l2c_enable(void __iomem *base, u32 aux, unsigned num_lock) { unsigned long flags; - l2c_write_sec(aux, base, L2X0_AUX_CTRL); + /* Do not touch the controller if already enabled. */ + if (readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN) + return; + + l2x0_saved_regs.aux_ctrl = aux; + l2c_configure(base); l2c_unlock(base, num_lock); @@ -208,6 +223,11 @@ static void l2c_save(void __iomem *base) l2x0_saved_regs.aux_ctrl = readl_relaxed(l2x0_base + L2X0_AUX_CTRL); } +static void l2c_resume(void) +{ + l2c_enable(l2x0_base, l2x0_saved_regs.aux_ctrl, l2x0_data->num_lock); +} + /* * L2C-210 specific code. * @@ -288,14 +308,6 @@ static void l2c210_sync(void) __l2c210_cache_sync(l2x0_base); } -static void l2c210_resume(void) -{ - void __iomem *base = l2x0_base; - - if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN)) - l2c_enable(base, l2x0_saved_regs.aux_ctrl, 1); -} - static const struct l2c_init_data l2c210_data __initconst = { .type = "L2C-210", .way_size_0 = SZ_8K, @@ -309,7 +321,7 @@ static const struct l2c_init_data l2c210_data __initconst = { .flush_all = l2c210_flush_all, .disable = l2c_disable, .sync = l2c210_sync, - .resume = l2c210_resume, + .resume = l2c_resume, }, }; @@ -466,7 +478,7 @@ static const struct l2c_init_data l2c220_data = { .flush_all = l2c220_flush_all, .disable = l2c_disable, .sync = l2c220_sync, - .resume = l2c210_resume, + .resume = l2c_resume, }, }; @@ -615,39 +627,29 @@ static void __init l2c310_save(void __iomem *base) L310_POWER_CTRL); } -static void l2c310_resume(void) +static void l2c310_configure(void __iomem *base) { - void __iomem *base = l2x0_base; + unsigned revision; - if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN)) { - unsigned revision; - - /* restore pl310 setup */ - writel_relaxed(l2x0_saved_regs.tag_latency, - base + L310_TAG_LATENCY_CTRL); - writel_relaxed(l2x0_saved_regs.data_latency, - base + L310_DATA_LATENCY_CTRL); - writel_relaxed(l2x0_saved_regs.filter_end, - base + L310_ADDR_FILTER_END); - writel_relaxed(l2x0_saved_regs.filter_start, - base + L310_ADDR_FILTER_START); - - revision = readl_relaxed(base + L2X0_CACHE_ID) & - L2X0_CACHE_ID_RTL_MASK; - - if (revision >= L310_CACHE_ID_RTL_R2P0) - l2c_write_sec(l2x0_saved_regs.prefetch_ctrl, base, - L310_PREFETCH_CTRL); - if (revision >= L310_CACHE_ID_RTL_R3P0) - l2c_write_sec(l2x0_saved_regs.pwr_ctrl, base, - L310_POWER_CTRL); - - l2c_enable(base, l2x0_saved_regs.aux_ctrl, 8); - - /* Re-enable full-line-of-zeros for Cortex-A9 */ - if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO) - set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); - } + /* restore pl310 setup */ + writel_relaxed(l2x0_saved_regs.tag_latency, + base + L310_TAG_LATENCY_CTRL); + writel_relaxed(l2x0_saved_regs.data_latency, + base + L310_DATA_LATENCY_CTRL); + writel_relaxed(l2x0_saved_regs.filter_end, + base + L310_ADDR_FILTER_END); + writel_relaxed(l2x0_saved_regs.filter_start, + base + L310_ADDR_FILTER_START); + + revision = readl_relaxed(base + L2X0_CACHE_ID) & + L2X0_CACHE_ID_RTL_MASK; + + if (revision >= L310_CACHE_ID_RTL_R2P0) + l2c_write_sec(l2x0_saved_regs.prefetch_ctrl, base, + L310_PREFETCH_CTRL); + if (revision >= L310_CACHE_ID_RTL_R3P0) + l2c_write_sec(l2x0_saved_regs.pwr_ctrl, base, + L310_POWER_CTRL); } static int l2c310_cpu_enable_flz(struct notifier_block *nb, unsigned long act, void *data) @@ -699,6 +701,23 @@ static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock) aux &= ~(L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP); } + /* r3p0 or later has power control register */ + if (rev >= L310_CACHE_ID_RTL_R3P0) + l2x0_saved_regs.pwr_ctrl = L310_DYNAMIC_CLK_GATING_EN | + L310_STNDBY_MODE_EN; + + /* + * Always enable non-secure access to the lockdown registers - + * we write to them as part of the L2C enable sequence so they + * need to be accessible. + */ + aux |= L310_AUX_CTRL_NS_LOCKDOWN; + + l2c_enable(base, aux, num_lock); + + /* Read back resulting AUX_CTRL value as it could have been altered. */ + aux = readl_relaxed(base + L2X0_AUX_CTRL); + if (aux & (L310_AUX_CTRL_DATA_PREFETCH | L310_AUX_CTRL_INSTR_PREFETCH)) { u32 prefetch = readl_relaxed(base + L310_PREFETCH_CTRL); @@ -712,23 +731,12 @@ static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock) if (rev >= L310_CACHE_ID_RTL_R3P0) { u32 power_ctrl; - l2c_write_sec(L310_DYNAMIC_CLK_GATING_EN | L310_STNDBY_MODE_EN, - base, L310_POWER_CTRL); power_ctrl = readl_relaxed(base + L310_POWER_CTRL); pr_info("L2C-310 dynamic clock gating %sabled, standby mode %sabled\n", power_ctrl & L310_DYNAMIC_CLK_GATING_EN ? "en" : "dis", power_ctrl & L310_STNDBY_MODE_EN ? "en" : "dis"); } - /* - * Always enable non-secure access to the lockdown registers - - * we write to them as part of the L2C enable sequence so they - * need to be accessible. - */ - aux |= L310_AUX_CTRL_NS_LOCKDOWN; - - l2c_enable(base, aux, num_lock); - if (aux & L310_AUX_CTRL_FULL_LINE_ZERO) { set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); cpu_notifier(l2c310_cpu_enable_flz, 0); @@ -760,11 +768,11 @@ static void __init l2c310_fixup(void __iomem *base, u32 cache_id, if (revision >= L310_CACHE_ID_RTL_R3P0 && revision < L310_CACHE_ID_RTL_R3P2) { - u32 val = readl_relaxed(base + L310_PREFETCH_CTRL); + u32 val = l2x0_saved_regs.prefetch_ctrl; /* I don't think bit23 is required here... but iMX6 does so */ if (val & (BIT(30) | BIT(23))) { val &= ~(BIT(30) | BIT(23)); - l2c_write_sec(val, base, L310_PREFETCH_CTRL); + l2x0_saved_regs.prefetch_ctrl = val; errata[n++] = "752271"; } } @@ -800,6 +808,15 @@ static void l2c310_disable(void) l2c_disable(); } +static void l2c310_resume(void) +{ + l2c_resume(); + + /* Re-enable full-line-of-zeros for Cortex-A9 */ + if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO) + set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); +} + static const struct l2c_init_data l2c310_init_fns __initconst = { .type = "L2C-310", .way_size_0 = SZ_8K, @@ -807,6 +824,7 @@ static const struct l2c_init_data l2c310_init_fns __initconst = { .enable = l2c310_enable, .fixup = l2c310_fixup, .save = l2c310_save, + .configure = l2c310_configure, .outer_cache = { .inv_range = l2c210_inv_range, .clean_range = l2c210_clean_range, @@ -818,7 +836,7 @@ static const struct l2c_init_data l2c310_init_fns __initconst = { }, }; -static void __init __l2c_init(const struct l2c_init_data *data, +static int __init __l2c_init(const struct l2c_init_data *data, u32 aux_val, u32 aux_mask, u32 cache_id) { struct outer_cache_fns fns; @@ -826,6 +844,14 @@ static void __init __l2c_init(const struct l2c_init_data *data, u32 aux, old_aux; /* + * Save the pointer globally so that callbacks which do not receive + * context from callers can access the structure. + */ + l2x0_data = kmemdup(data, sizeof(*data), GFP_KERNEL); + if (!l2x0_data) + return -ENOMEM; + + /* * Sanity check the aux values. aux_mask is the bits we preserve * from reading the hardware register, and aux_val is the bits we * set. @@ -910,6 +936,8 @@ static void __init __l2c_init(const struct l2c_init_data *data, data->type, ways, l2x0_size >> 10); pr_info("%s: CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n", data->type, cache_id, aux); + + return 0; } void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask) @@ -936,6 +964,10 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask) break; } + /* Read back current (default) hardware configuration */ + if (data->save) + data->save(l2x0_base); + __l2c_init(data, aux_val, aux_mask, cache_id); } @@ -1102,7 +1134,7 @@ static const struct l2c_init_data of_l2c210_data __initconst = { .flush_all = l2c210_flush_all, .disable = l2c_disable, .sync = l2c210_sync, - .resume = l2c210_resume, + .resume = l2c_resume, }, }; @@ -1120,7 +1152,7 @@ static const struct l2c_init_data of_l2c220_data __initconst = { .flush_all = l2c220_flush_all, .disable = l2c_disable, .sync = l2c220_sync, - .resume = l2c210_resume, + .resume = l2c_resume, }, }; @@ -1135,28 +1167,26 @@ static void __init l2c310_of_parse(const struct device_node *np, of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag)); if (tag[0] && tag[1] && tag[2]) - writel_relaxed( + l2x0_saved_regs.tag_latency = L310_LATENCY_CTRL_RD(tag[0] - 1) | L310_LATENCY_CTRL_WR(tag[1] - 1) | - L310_LATENCY_CTRL_SETUP(tag[2] - 1), - l2x0_base + L310_TAG_LATENCY_CTRL); + L310_LATENCY_CTRL_SETUP(tag[2] - 1); of_property_read_u32_array(np, "arm,data-latency", data, ARRAY_SIZE(data)); if (data[0] && data[1] && data[2]) - writel_relaxed( + l2x0_saved_regs.data_latency = L310_LATENCY_CTRL_RD(data[0] - 1) | L310_LATENCY_CTRL_WR(data[1] - 1) | - L310_LATENCY_CTRL_SETUP(data[2] - 1), - l2x0_base + L310_DATA_LATENCY_CTRL); + L310_LATENCY_CTRL_SETUP(data[2] - 1); of_property_read_u32_array(np, "arm,filter-ranges", filter, ARRAY_SIZE(filter)); if (filter[1]) { - writel_relaxed(ALIGN(filter[0] + filter[1], SZ_1M), - l2x0_base + L310_ADDR_FILTER_END); - writel_relaxed((filter[0] & ~(SZ_1M - 1)) | L310_ADDR_FILTER_EN, - l2x0_base + L310_ADDR_FILTER_START); + l2x0_saved_regs.filter_end = + ALIGN(filter[0] + filter[1], SZ_1M); + l2x0_saved_regs.filter_start = (filter[0] & ~(SZ_1M - 1)) + | L310_ADDR_FILTER_EN; } ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K); @@ -1188,6 +1218,7 @@ static const struct l2c_init_data of_l2c310_data __initconst = { .enable = l2c310_enable, .fixup = l2c310_fixup, .save = l2c310_save, + .configure = l2c310_configure, .outer_cache = { .inv_range = l2c210_inv_range, .clean_range = l2c210_clean_range, @@ -1216,6 +1247,7 @@ static const struct l2c_init_data of_l2c310_coherent_data __initconst = { .enable = l2c310_enable, .fixup = l2c310_fixup, .save = l2c310_save, + .configure = l2c310_configure, .outer_cache = { .inv_range = l2c210_inv_range, .clean_range = l2c210_clean_range, @@ -1330,16 +1362,6 @@ static void aurora_save(void __iomem *base) l2x0_saved_regs.aux_ctrl = readl_relaxed(base + L2X0_AUX_CTRL); } -static void aurora_resume(void) -{ - void __iomem *base = l2x0_base; - - if (!(readl(base + L2X0_CTRL) & L2X0_CTRL_EN)) { - writel_relaxed(l2x0_saved_regs.aux_ctrl, base + L2X0_AUX_CTRL); - writel_relaxed(l2x0_saved_regs.ctrl, base + L2X0_CTRL); - } -} - /* * For Aurora cache in no outer mode, enable via the CP15 coprocessor * broadcasting of cache commands to L2. @@ -1401,7 +1423,7 @@ static const struct l2c_init_data of_aurora_with_outer_data __initconst = { .flush_all = l2x0_flush_all, .disable = l2x0_disable, .sync = l2x0_cache_sync, - .resume = aurora_resume, + .resume = l2c_resume, }, }; @@ -1414,7 +1436,7 @@ static const struct l2c_init_data of_aurora_no_outer_data __initconst = { .fixup = aurora_fixup, .save = aurora_save, .outer_cache = { - .resume = aurora_resume, + .resume = l2c_resume, }, }; @@ -1562,6 +1584,7 @@ static const struct l2c_init_data of_bcm_l2x0_data __initconst = { .of_parse = l2c310_of_parse, .enable = l2c310_enable, .save = l2c310_save, + .configure = l2c310_configure, .outer_cache = { .inv_range = bcm_inv_range, .clean_range = bcm_clean_range, @@ -1583,18 +1606,12 @@ static void __init tauros3_save(void __iomem *base) readl_relaxed(base + L310_PREFETCH_CTRL); } -static void tauros3_resume(void) +static void tauros3_configure(void __iomem *base) { - void __iomem *base = l2x0_base; - - if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN)) { - writel_relaxed(l2x0_saved_regs.aux2_ctrl, - base + TAUROS3_AUX2_CTRL); - writel_relaxed(l2x0_saved_regs.prefetch_ctrl, - base + L310_PREFETCH_CTRL); - - l2c_enable(base, l2x0_saved_regs.aux_ctrl, 8); - } + writel_relaxed(l2x0_saved_regs.aux2_ctrl, + base + TAUROS3_AUX2_CTRL); + writel_relaxed(l2x0_saved_regs.prefetch_ctrl, + base + L310_PREFETCH_CTRL); } static const struct l2c_init_data of_tauros3_data __initconst = { @@ -1603,9 +1620,10 @@ static const struct l2c_init_data of_tauros3_data __initconst = { .num_lock = 8, .enable = l2c_enable, .save = tauros3_save, + .configure = tauros3_configure, /* Tauros3 broadcasts L1 cache operations to L2 */ .outer_cache = { - .resume = tauros3_resume, + .resume = l2c_resume, }, }; @@ -1661,6 +1679,10 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask) if (!of_property_read_bool(np, "cache-unified")) pr_err("L2C: device tree omits to specify unified cache\n"); + /* Read back current (default) hardware configuration */ + if (data->save) + data->save(l2x0_base); + /* L2 configuration can only be changed if the cache is disabled */ if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) if (data->of_parse) @@ -1671,8 +1693,6 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask) else cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID); - __l2c_init(data, aux_val, aux_mask, cache_id); - - return 0; + return __l2c_init(data, aux_val, aux_mask, cache_id); } #endif

[v10,2/8] ARM: l2c: Refactor the driver to use commit-like interface

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