diff options
Diffstat (limited to 'drivers/clk/qcom/clock-apq8016.c')
| -rw-r--r-- | drivers/clk/qcom/clock-apq8016.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clock-apq8016.c b/drivers/clk/qcom/clock-apq8016.c new file mode 100644 index 00000000000..c0ce570edc7 --- /dev/null +++ b/drivers/clk/qcom/clock-apq8016.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* + * Clock drivers for Qualcomm APQ8016 + * + * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> + * + * Based on Little Kernel driver, simplified + */ + +#include <common.h> +#include <clk-uclass.h> +#include <dm.h> +#include <errno.h> +#include <asm/io.h> +#include <linux/bitops.h> + +#include "clock-qcom.h" + +/* Clocks: (from CLK_CTL_BASE) */ +#define GPLL0_STATUS (0x2101C) +#define APCS_GPLL_ENA_VOTE (0x45000) +#define APCS_CLOCK_BRANCH_ENA_VOTE (0x45004) + +#define SDCC_BCR(n) ((n * 0x1000) + 0x41000) +#define SDCC_CMD_RCGR(n) ((n * 0x1000) + 0x41004) +#define SDCC_CFG_RCGR(n) ((n * 0x1000) + 0x41008) +#define SDCC_M(n) ((n * 0x1000) + 0x4100C) +#define SDCC_N(n) ((n * 0x1000) + 0x41010) +#define SDCC_D(n) ((n * 0x1000) + 0x41014) +#define SDCC_APPS_CBCR(n) ((n * 0x1000) + 0x41018) +#define SDCC_AHB_CBCR(n) ((n * 0x1000) + 0x4101C) + +/* BLSP1 AHB clock (root clock for BLSP) */ +#define BLSP1_AHB_CBCR 0x1008 + +/* Uart clock control registers */ +#define BLSP1_UART2_BCR (0x3028) +#define BLSP1_UART2_APPS_CBCR (0x302C) +#define BLSP1_UART2_APPS_CMD_RCGR (0x3034) +#define BLSP1_UART2_APPS_CFG_RCGR (0x3038) +#define BLSP1_UART2_APPS_M (0x303C) +#define BLSP1_UART2_APPS_N (0x3040) +#define BLSP1_UART2_APPS_D (0x3044) + +/* GPLL0 clock control registers */ +#define GPLL0_STATUS_ACTIVE BIT(17) + +static const struct bcr_regs sdc_regs[] = { + { + .cfg_rcgr = SDCC_CFG_RCGR(1), + .cmd_rcgr = SDCC_CMD_RCGR(1), + .M = SDCC_M(1), + .N = SDCC_N(1), + .D = SDCC_D(1), + }, + { + .cfg_rcgr = SDCC_CFG_RCGR(2), + .cmd_rcgr = SDCC_CMD_RCGR(2), + .M = SDCC_M(2), + .N = SDCC_N(2), + .D = SDCC_D(2), + } +}; + +static struct pll_vote_clk gpll0_vote_clk = { + .status = GPLL0_STATUS, + .status_bit = GPLL0_STATUS_ACTIVE, + .ena_vote = APCS_GPLL_ENA_VOTE, + .vote_bit = BIT(0), +}; + +static struct vote_clk gcc_blsp1_ahb_clk = { + .cbcr_reg = BLSP1_AHB_CBCR, + .ena_vote = APCS_CLOCK_BRANCH_ENA_VOTE, + .vote_bit = BIT(10), +}; + +/* SDHCI */ +static int clk_init_sdc(struct msm_clk_priv *priv, int slot, uint rate) +{ + int div = 15; /* 100MHz default */ + + if (rate == 200000000) + div = 4; + + clk_enable_cbc(priv->base + SDCC_AHB_CBCR(slot)); + /* 800Mhz/div, gpll0 */ + clk_rcg_set_rate_mnd(priv->base, &sdc_regs[slot], div, 0, 0, + CFG_CLK_SRC_GPLL0, 8); + clk_enable_gpll0(priv->base, &gpll0_vote_clk); + clk_enable_cbc(priv->base + SDCC_APPS_CBCR(slot)); + + return rate; +} + +static const struct bcr_regs uart2_regs = { + .cfg_rcgr = BLSP1_UART2_APPS_CFG_RCGR, + .cmd_rcgr = BLSP1_UART2_APPS_CMD_RCGR, + .M = BLSP1_UART2_APPS_M, + .N = BLSP1_UART2_APPS_N, + .D = BLSP1_UART2_APPS_D, +}; + +/* UART: 115200 */ +static int clk_init_uart(struct msm_clk_priv *priv) +{ + /* Enable AHB clock */ + clk_enable_vote_clk(priv->base, &gcc_blsp1_ahb_clk); + + /* 7372800 uart block clock @ GPLL0 */ + clk_rcg_set_rate_mnd(priv->base, &uart2_regs, 1, 144, 15625, + CFG_CLK_SRC_GPLL0, 16); + + /* Vote for gpll0 clock */ + clk_enable_gpll0(priv->base, &gpll0_vote_clk); + + /* Enable core clk */ + clk_enable_cbc(priv->base + BLSP1_UART2_APPS_CBCR); + + return 0; +} + +static ulong apq8016_clk_set_rate(struct clk *clk, ulong rate) +{ + struct msm_clk_priv *priv = dev_get_priv(clk->dev); + + switch (clk->id) { + case 0: /* SDC1 */ + return clk_init_sdc(priv, 0, rate); + break; + case 1: /* SDC2 */ + return clk_init_sdc(priv, 1, rate); + break; + case 4: /* UART2 */ + return clk_init_uart(priv); + break; + default: + return 0; + } +} + +static struct msm_clk_data apq8016_clk_data = { + .set_rate = apq8016_clk_set_rate, +}; + +static const struct udevice_id gcc_apq8016_of_match[] = { + { + .compatible = "qcom,gcc-apq8016", + .data = (ulong)&apq8016_clk_data, + }, + { } +}; + +U_BOOT_DRIVER(gcc_apq8016) = { + .name = "gcc_apq8016", + .id = UCLASS_NOP, + .of_match = gcc_apq8016_of_match, + .bind = qcom_cc_bind, + .flags = DM_FLAG_PRE_RELOC, +}; |