From mboxrd@z Thu Jan 1 00:00:00 1970 From: mike@compulab.co.il (Mike Rapoport) Date: Thu, 16 Sep 2010 18:53:34 +0200 Subject: [PATCH 1/3] [ARM] tegra: add PCI Express clocks In-Reply-To: References: Message-ID: <79b943ad0c9d4b99a6207e1a7e3ae09bbbe4fae5.1284655723.git.mike@compulab.co.il> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Signed-off-by: Mike Rapoport --- arch/arm/mach-tegra/tegra2_clocks.c | 76 +++++++++++++++++++++++++++++++++- 1 files changed, 73 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-tegra/tegra2_clocks.c b/arch/arm/mach-tegra/tegra2_clocks.c index 4261632..44f1b81 100644 --- a/arch/arm/mach-tegra/tegra2_clocks.c +++ b/arch/arm/mach-tegra/tegra2_clocks.c @@ -92,6 +92,8 @@ #define PLLD_MISC_DIV_RST (1<<23) #define PLLD_MISC_DCCON_SHIFT 12 +#define PLLE_MISC_READY (1 << 15) + #define PERIPH_CLK_TO_ENB_REG(c) ((c->clk_num / 32) * 4) #define PERIPH_CLK_TO_ENB_SET_REG(c) ((c->clk_num / 32) * 8) #define PERIPH_CLK_TO_ENB_BIT(c) (1 << (c->clk_num % 32)) @@ -356,12 +358,12 @@ static unsigned long tegra2_pll_clk_recalculate_rate(struct clk *c) return c->rate; } -static int tegra2_pll_clk_wait_for_lock(struct clk *c) +static int tegra2_pll_clk_wait_for_bit_set(struct clk *c, int bit) { ktime_t before; before = ktime_get(); - while (!(clk_readl(c->reg + PLL_BASE) & PLL_BASE_LOCK)) { + while (!(clk_readl(c->reg + PLL_BASE) & bit)) { if (ktime_us_delta(ktime_get(), before) > 5000) { pr_err("Timed out waiting for lock bit on pll %s", c->name); @@ -414,7 +416,7 @@ static int tegra2_pll_clk_enable(struct clk *c) val |= PLL_MISC_LOCK_ENABLE; clk_writel(val, c->reg + PLL_MISC(c)); - tegra2_pll_clk_wait_for_lock(c); + tegra2_pll_clk_wait_for_bit_set(c, PLL_BASE_LOCK); return 0; } @@ -754,6 +756,34 @@ static struct clk_ops tegra_clk_double_ops = { .recalculate_rate = &tegra2_clk_recalculate_rate, }; +/* PCI Express clock ops */ +static int tegra2_plle_clk_enable(struct clk *c) +{ + u32 val; + + pr_debug("%s on clock %s\n", __func__, c->name); + + if (tegra2_pll_clk_wait_for_bit_set(c, PLLE_MISC_READY)) + return -EBUSY; + + val = clk_readl(c->reg + PLL_BASE); + val |= PLL_BASE_ENABLE | PLL_BASE_BYPASS; + clk_writel(val, c->reg + PLL_BASE); + + return 0; +} + +static struct clk_ops tegra_plle_ops = { + .init = tegra2_pll_clk_init, + .enable = tegra2_plle_clk_enable, + .set_rate = tegra2_pll_clk_set_rate, +}; + +static struct clk_ops tegra_pcie_clk_ops = { + .enable = tegra2_periph_clk_enable, + .disable = tegra2_periph_clk_disable, +}; + /* Clock definitions */ static struct clk tegra_clk_32k = { .name = "clk_32k", @@ -1109,6 +1139,42 @@ static struct clk tegra_clk_pclk = { .ops = &tegra_bus_ops, }; +/* PCI Express clocks */ +static struct clk_pll_table tegra_pll_e_table[] = { + { 12000000, 100000000, 200, 24, 1, 0 }, +}; + +static struct clk tegra_pll_e = { + .name = "pll_e", + .flags = PLL_ALT_MISC_REG, + .ops = &tegra_plle_ops, + .input_min = 12000000, + .input_max = 12000000, + .parent = &tegra_clk_m, + .reg = 0xe8, + .pll_table = tegra_pll_e_table, +}; + +static struct clk tegra_clk_pex = { + .name = "pex", + .flags = PERIPH_MANUAL_RESET, + .ops = &tegra_pcie_clk_ops, + .clk_num = 70, +}; + +static struct clk tegra_clk_afi = { + .name = "afi", + .flags = PERIPH_MANUAL_RESET, + .ops = &tegra_pcie_clk_ops, + .clk_num = 72, +}; + +/* the pcie_xclk is required for reset of PCIE subsystem */ +static struct clk tegra_clk_pcie_xclk = { + .name = "pcie_xclk", + .clk_num = 74, +}; + static struct clk_mux_sel mux_pllm_pllc_pllp_plla[] = { { .input = &tegra_pll_m, .value = 0}, { .input = &tegra_pll_c, .value = 1}, @@ -1315,11 +1381,15 @@ struct clk_lookup tegra_clk_lookups[] = { CLK(NULL, "pll_d_out0", &tegra_pll_d_out0), CLK(NULL, "pll_u", &tegra_pll_u), CLK(NULL, "pll_x", &tegra_pll_x), + CLK(NULL, "pll_e", &tegra_pll_e), CLK(NULL, "cpu", &tegra_clk_cpu), CLK(NULL, "sys", &tegra_clk_sys), CLK(NULL, "hclk", &tegra_clk_hclk), CLK(NULL, "pclk", &tegra_clk_pclk), CLK(NULL, "clk_d", &tegra_clk_d), + CLK(NULL, "pcie_xclk", &tegra_clk_pcie_xclk), + CLK(NULL, "pex", &tegra_clk_pex), + CLK(NULL, "afi", &tegra_clk_afi), }; void __init tegra2_init_clocks(void) -- 1.6.6.2