linux-hardened/drivers/clk/clk-aspeed.c
Linus Torvalds db06f826ec The new and exciting feature this time around is in the clk core.
We've added duty cycle support to the clk API so that clk signal
 duty cycle ratios can be adjusted while taking into account things
 like clk dividers and clk tree hierarchy. So far only one SoC has
 implemented support for this, but I expect there will be more to
 come in the future.
 
 Outside of the core, we have the usual pile of clk driver updates
 and additions. The Amlogic meson driver got the most lines in the
 diffstat this time around because it added support for a whole bunch
 of hardware and duty cycle configuration. After that the Rockchip PX30,
 Qualcomm SDM845, and Renesas SoC drivers fill in a majority of the diff.
 We're left with the collection of non-critical fixes after that. Overall
 it looks pretty quiet this time.
 
 Core:
  - Clk duty cycle support
  - Proper CLK_SET_RATE_GATE support throughout the tree
 
 New Drivers:
  - Actions Semi Owl series S700 SoC clk driver
  - Qualcomm SDM845 display clock controller
  - i.MX6SX ocram_s clk support
  - Uniphier NAND, USB3 PHY, and SPI clk support
  - Qualcomm RPMh clk driver
  - i.MX7D mailbox clk support
  - Maxim 9485 Programmable Clock Generator
  - Expose 32 kHz PLL on PXA SoCs
  - imx6sll GPIO clk gate support
  - Atmel at91 I2S audio clk support
  - SI544/SI514 clk on/off support
  - i.MX6UL GPIO clock gates in CCM CCGR
  - Renesas Crypto Engine clocks on R-Car H3
  - Renesas clk support for the new RZ/N1D SoC
  - Allwinner A64 display engine clock support
  - Support for Rockchip's PX30 SoC
  - Amlogic Meson axg PCIe and audio clocks
  - Amlogic Meson GEN CLK on gxbb, gxl and axg
 
 Updates:
  - Remove an unused variable from Exynos4412 ISP driver
  - Fix a thinko bug in SCMI clk division logic
  - Add missing of_node_put()s in some i.MX clk drivers
  - Tegra SDMMC clk jitter improvements with high speed signaling modes
  - SPDX tagging for qcom and cs2000-cp drivers
  - Stop leaking con ids in __clk_put()
  - Fix a corner case in fixed factor clk probing where node is in DT but
    parent clk is registered much later
  - Marvell Armada 3700 clk_pm_cpu_get_parent() had an invalid return value
  - i.MX clk init arrays removed in place of CLK_IS_CRITICAL
  - Convert to CLK_IS_CRITICAL for i.MX51/53 driver
  - Fix Tegra BPMP driver oops when xlating a NULL clk
  - Proper default configuration for vic03 and vde clks on Tegra124
  - Mark Tegra memory controller clks as critical
  - Fix array bounds clamp in Tegra's emc determine_rate() op
  - Ingenic i2s bit update and allow UDC clk to gate
  - Fix name of aspeed SDC clk define to have only one 'CLK'
  - Fix i.MX6QDL video clk parent
  - Critical clk markings for qcom SDM845
  - Fix Stratix10 mpu_free_clk and sdmmc_free_clk parents
  - Mark Rockchip's pclk_rkpwm_pmu as critical clock, due to it supplying
    the pwm used to drive the logic supply of the rk3399 core.
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Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

Pull clk updates from Stephen Boyd:
 "The new and exciting feature this time around is in the clk core.
  We've added duty cycle support to the clk API so that clk signal duty
  cycle ratios can be adjusted while taking into account things like clk
  dividers and clk tree hierarchy. So far only one SoC has implemented
  support for this, but I expect there will be more to come in the
  future.

  Outside of the core, we have the usual pile of clk driver updates and
  additions. The Amlogic meson driver got the most lines in the diffstat
  this time around because it added support for a whole bunch of
  hardware and duty cycle configuration. After that the Rockchip PX30,
  Qualcomm SDM845, and Renesas SoC drivers fill in a majority of the
  diff. We're left with the collection of non-critical fixes after that.
  Overall it looks pretty quiet this time.

  Core:
   - Clk duty cycle support
   - Proper CLK_SET_RATE_GATE support throughout the tree

  New Drivers:
   - Actions Semi Owl series S700 SoC clk driver
   - Qualcomm SDM845 display clock controller
   - i.MX6SX ocram_s clk support
   - Uniphier NAND, USB3 PHY, and SPI clk support
   - Qualcomm RPMh clk driver
   - i.MX7D mailbox clk support
   - Maxim 9485 Programmable Clock Generator
   - expose 32 kHz PLL on PXA SoCs
   - imx6sll GPIO clk gate support
   - Atmel at91 I2S audio clk support
   - SI544/SI514 clk on/off support
   - i.MX6UL GPIO clock gates in CCM CCGR
   - Renesas Crypto Engine clocks on R-Car H3
   - Renesas clk support for the new RZ/N1D SoC
   - Allwinner A64 display engine clock support
   - support for Rockchip's PX30 SoC
   - Amlogic Meson axg PCIe and audio clocks
   - Amlogic Meson GEN CLK on gxbb, gxl and axg

  Updates:
   - remove an unused variable from Exynos4412 ISP driver
   - fix a thinko bug in SCMI clk division logic
   - add missing of_node_put()s in some i.MX clk drivers
   - Tegra SDMMC clk jitter improvements with high speed signaling modes
   - SPDX tagging for qcom and cs2000-cp drivers
   - stop leaking con ids in __clk_put()
   - fix a corner case in fixed factor clk probing where node is in DT
     but parent clk is registered much later
   - Marvell Armada 3700 clk_pm_cpu_get_parent() had an invalid return
     value
   - i.MX clk init arrays removed in place of CLK_IS_CRITICAL
   - convert to CLK_IS_CRITICAL for i.MX51/53 driver
   - fix Tegra BPMP driver oops when xlating a NULL clk
   - proper default configuration for vic03 and vde clks on Tegra124
   - mark Tegra memory controller clks as critical
   - fix array bounds clamp in Tegra's emc determine_rate() op
   - Ingenic i2s bit update and allow UDC clk to gate
   - fix name of aspeed SDC clk define to have only one 'CLK'
   - fix i.MX6QDL video clk parent
   - critical clk markings for qcom SDM845
   - fix Stratix10 mpu_free_clk and sdmmc_free_clk parents
   - mark Rockchip's pclk_rkpwm_pmu as critical clock, due to it
     supplying the pwm used to drive the logic supply of the rk3399
     core"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (85 commits)
  clk: rockchip: Add pclk_rkpwm_pmu to PMU critical clocks in rk3399
  clk: cs2000-cp: convert to SPDX identifiers
  clk: scmi: Fix the rounding of clock rate
  clk: qcom: Add display clock controller driver for SDM845
  clk: mvebu: armada-37xx-periph: Remove unused var num_parents
  clk: samsung: Remove unused mout_user_aclk400_mcuisp_p4x12 variable
  clk: actions: Add S700 SoC clock support
  dt-bindings: clock: Add S700 support for Actions Semi Soc's
  clk: actions: Add missing REGMAP_MMIO dependency
  clk: uniphier: add clock frequency support for SPI
  clk: uniphier: add more USB3 PHY clocks
  clk: uniphier: add NAND 200MHz clock
  clk: tegra: make sdmmc2 and sdmmc4 as sdmmc clocks
  clk: tegra: Add sdmmc mux divider clock
  clk: tegra: Refactor fractional divider calculation
  clk: tegra: Fix includes required by fence_udelay()
  clk: imx6sll: fix missing of_node_put()
  clk: imx6ul: fix missing of_node_put()
  clk: imx: add ocram_s clock for i.mx6sx
  clk: mvebu: armada-37xx-periph: Fix wrong return value in get_parent
  ...
2018-08-15 21:41:21 -07:00

737 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0+
#define pr_fmt(fmt) "clk-aspeed: " fmt
#include <linux/clk-provider.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <dt-bindings/clock/aspeed-clock.h>
#define ASPEED_NUM_CLKS 36
#define ASPEED_RESET2_OFFSET 32
#define ASPEED_RESET_CTRL 0x04
#define ASPEED_CLK_SELECTION 0x08
#define ASPEED_CLK_STOP_CTRL 0x0c
#define ASPEED_MPLL_PARAM 0x20
#define ASPEED_HPLL_PARAM 0x24
#define AST2500_HPLL_BYPASS_EN BIT(20)
#define AST2400_HPLL_PROGRAMMED BIT(18)
#define AST2400_HPLL_BYPASS_EN BIT(17)
#define ASPEED_MISC_CTRL 0x2c
#define UART_DIV13_EN BIT(12)
#define ASPEED_STRAP 0x70
#define CLKIN_25MHZ_EN BIT(23)
#define AST2400_CLK_SOURCE_SEL BIT(18)
#define ASPEED_CLK_SELECTION_2 0xd8
#define ASPEED_RESET_CTRL2 0xd4
/* Globally visible clocks */
static DEFINE_SPINLOCK(aspeed_clk_lock);
/* Keeps track of all clocks */
static struct clk_hw_onecell_data *aspeed_clk_data;
static void __iomem *scu_base;
/**
* struct aspeed_gate_data - Aspeed gated clocks
* @clock_idx: bit used to gate this clock in the clock register
* @reset_idx: bit used to reset this IP in the reset register. -1 if no
* reset is required when enabling the clock
* @name: the clock name
* @parent_name: the name of the parent clock
* @flags: standard clock framework flags
*/
struct aspeed_gate_data {
u8 clock_idx;
s8 reset_idx;
const char *name;
const char *parent_name;
unsigned long flags;
};
/**
* struct aspeed_clk_gate - Aspeed specific clk_gate structure
* @hw: handle between common and hardware-specific interfaces
* @reg: register controlling gate
* @clock_idx: bit used to gate this clock in the clock register
* @reset_idx: bit used to reset this IP in the reset register. -1 if no
* reset is required when enabling the clock
* @flags: hardware-specific flags
* @lock: register lock
*
* Some of the clocks in the Aspeed SoC must be put in reset before enabling.
* This modified version of clk_gate allows an optional reset bit to be
* specified.
*/
struct aspeed_clk_gate {
struct clk_hw hw;
struct regmap *map;
u8 clock_idx;
s8 reset_idx;
u8 flags;
spinlock_t *lock;
};
#define to_aspeed_clk_gate(_hw) container_of(_hw, struct aspeed_clk_gate, hw)
/* TODO: ask Aspeed about the actual parent data */
static const struct aspeed_gate_data aspeed_gates[] = {
/* clk rst name parent flags */
[ASPEED_CLK_GATE_ECLK] = { 0, -1, "eclk-gate", "eclk", 0 }, /* Video Engine */
[ASPEED_CLK_GATE_GCLK] = { 1, 7, "gclk-gate", NULL, 0 }, /* 2D engine */
[ASPEED_CLK_GATE_MCLK] = { 2, -1, "mclk-gate", "mpll", CLK_IS_CRITICAL }, /* SDRAM */
[ASPEED_CLK_GATE_VCLK] = { 3, 6, "vclk-gate", NULL, 0 }, /* Video Capture */
[ASPEED_CLK_GATE_BCLK] = { 4, 8, "bclk-gate", "bclk", CLK_IS_CRITICAL }, /* PCIe/PCI */
[ASPEED_CLK_GATE_DCLK] = { 5, -1, "dclk-gate", NULL, CLK_IS_CRITICAL }, /* DAC */
[ASPEED_CLK_GATE_REFCLK] = { 6, -1, "refclk-gate", "clkin", CLK_IS_CRITICAL },
[ASPEED_CLK_GATE_USBPORT2CLK] = { 7, 3, "usb-port2-gate", NULL, 0 }, /* USB2.0 Host port 2 */
[ASPEED_CLK_GATE_LCLK] = { 8, 5, "lclk-gate", NULL, 0 }, /* LPC */
[ASPEED_CLK_GATE_USBUHCICLK] = { 9, 15, "usb-uhci-gate", NULL, 0 }, /* USB1.1 (requires port 2 enabled) */
[ASPEED_CLK_GATE_D1CLK] = { 10, 13, "d1clk-gate", NULL, 0 }, /* GFX CRT */
[ASPEED_CLK_GATE_YCLK] = { 13, 4, "yclk-gate", NULL, 0 }, /* HAC */
[ASPEED_CLK_GATE_USBPORT1CLK] = { 14, 14, "usb-port1-gate", NULL, 0 }, /* USB2 hub/USB2 host port 1/USB1.1 dev */
[ASPEED_CLK_GATE_UART1CLK] = { 15, -1, "uart1clk-gate", "uart", 0 }, /* UART1 */
[ASPEED_CLK_GATE_UART2CLK] = { 16, -1, "uart2clk-gate", "uart", 0 }, /* UART2 */
[ASPEED_CLK_GATE_UART5CLK] = { 17, -1, "uart5clk-gate", "uart", 0 }, /* UART5 */
[ASPEED_CLK_GATE_ESPICLK] = { 19, -1, "espiclk-gate", NULL, 0 }, /* eSPI */
[ASPEED_CLK_GATE_MAC1CLK] = { 20, 11, "mac1clk-gate", "mac", 0 }, /* MAC1 */
[ASPEED_CLK_GATE_MAC2CLK] = { 21, 12, "mac2clk-gate", "mac", 0 }, /* MAC2 */
[ASPEED_CLK_GATE_RSACLK] = { 24, -1, "rsaclk-gate", NULL, 0 }, /* RSA */
[ASPEED_CLK_GATE_UART3CLK] = { 25, -1, "uart3clk-gate", "uart", 0 }, /* UART3 */
[ASPEED_CLK_GATE_UART4CLK] = { 26, -1, "uart4clk-gate", "uart", 0 }, /* UART4 */
[ASPEED_CLK_GATE_SDCLK] = { 27, 16, "sdclk-gate", NULL, 0 }, /* SDIO/SD */
[ASPEED_CLK_GATE_LHCCLK] = { 28, -1, "lhclk-gate", "lhclk", 0 }, /* LPC master/LPC+ */
};
static const struct clk_div_table ast2500_mac_div_table[] = {
{ 0x0, 4 }, /* Yep, really. Aspeed confirmed this is correct */
{ 0x1, 4 },
{ 0x2, 6 },
{ 0x3, 8 },
{ 0x4, 10 },
{ 0x5, 12 },
{ 0x6, 14 },
{ 0x7, 16 },
{ 0 }
};
static const struct clk_div_table ast2400_div_table[] = {
{ 0x0, 2 },
{ 0x1, 4 },
{ 0x2, 6 },
{ 0x3, 8 },
{ 0x4, 10 },
{ 0x5, 12 },
{ 0x6, 14 },
{ 0x7, 16 },
{ 0 }
};
static const struct clk_div_table ast2500_div_table[] = {
{ 0x0, 4 },
{ 0x1, 8 },
{ 0x2, 12 },
{ 0x3, 16 },
{ 0x4, 20 },
{ 0x5, 24 },
{ 0x6, 28 },
{ 0x7, 32 },
{ 0 }
};
static struct clk_hw *aspeed_ast2400_calc_pll(const char *name, u32 val)
{
unsigned int mult, div;
if (val & AST2400_HPLL_BYPASS_EN) {
/* Pass through mode */
mult = div = 1;
} else {
/* F = 24Mhz * (2-OD) * [(N + 2) / (D + 1)] */
u32 n = (val >> 5) & 0x3f;
u32 od = (val >> 4) & 0x1;
u32 d = val & 0xf;
mult = (2 - od) * (n + 2);
div = d + 1;
}
return clk_hw_register_fixed_factor(NULL, name, "clkin", 0,
mult, div);
};
static struct clk_hw *aspeed_ast2500_calc_pll(const char *name, u32 val)
{
unsigned int mult, div;
if (val & AST2500_HPLL_BYPASS_EN) {
/* Pass through mode */
mult = div = 1;
} else {
/* F = clkin * [(M+1) / (N+1)] / (P + 1) */
u32 p = (val >> 13) & 0x3f;
u32 m = (val >> 5) & 0xff;
u32 n = val & 0x1f;
mult = (m + 1) / (n + 1);
div = p + 1;
}
return clk_hw_register_fixed_factor(NULL, name, "clkin", 0,
mult, div);
}
struct aspeed_clk_soc_data {
const struct clk_div_table *div_table;
const struct clk_div_table *mac_div_table;
struct clk_hw *(*calc_pll)(const char *name, u32 val);
};
static const struct aspeed_clk_soc_data ast2500_data = {
.div_table = ast2500_div_table,
.mac_div_table = ast2500_mac_div_table,
.calc_pll = aspeed_ast2500_calc_pll,
};
static const struct aspeed_clk_soc_data ast2400_data = {
.div_table = ast2400_div_table,
.mac_div_table = ast2400_div_table,
.calc_pll = aspeed_ast2400_calc_pll,
};
static int aspeed_clk_is_enabled(struct clk_hw *hw)
{
struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
u32 clk = BIT(gate->clock_idx);
u32 rst = BIT(gate->reset_idx);
u32 enval = (gate->flags & CLK_GATE_SET_TO_DISABLE) ? 0 : clk;
u32 reg;
/*
* If the IP is in reset, treat the clock as not enabled,
* this happens with some clocks such as the USB one when
* coming from cold reset. Without this, aspeed_clk_enable()
* will fail to lift the reset.
*/
if (gate->reset_idx >= 0) {
regmap_read(gate->map, ASPEED_RESET_CTRL, &reg);
if (reg & rst)
return 0;
}
regmap_read(gate->map, ASPEED_CLK_STOP_CTRL, &reg);
return ((reg & clk) == enval) ? 1 : 0;
}
static int aspeed_clk_enable(struct clk_hw *hw)
{
struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
unsigned long flags;
u32 clk = BIT(gate->clock_idx);
u32 rst = BIT(gate->reset_idx);
u32 enval;
spin_lock_irqsave(gate->lock, flags);
if (aspeed_clk_is_enabled(hw)) {
spin_unlock_irqrestore(gate->lock, flags);
return 0;
}
if (gate->reset_idx >= 0) {
/* Put IP in reset */
regmap_update_bits(gate->map, ASPEED_RESET_CTRL, rst, rst);
/* Delay 100us */
udelay(100);
}
/* Enable clock */
enval = (gate->flags & CLK_GATE_SET_TO_DISABLE) ? 0 : clk;
regmap_update_bits(gate->map, ASPEED_CLK_STOP_CTRL, clk, enval);
if (gate->reset_idx >= 0) {
/* A delay of 10ms is specified by the ASPEED docs */
mdelay(10);
/* Take IP out of reset */
regmap_update_bits(gate->map, ASPEED_RESET_CTRL, rst, 0);
}
spin_unlock_irqrestore(gate->lock, flags);
return 0;
}
static void aspeed_clk_disable(struct clk_hw *hw)
{
struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
unsigned long flags;
u32 clk = BIT(gate->clock_idx);
u32 enval;
spin_lock_irqsave(gate->lock, flags);
enval = (gate->flags & CLK_GATE_SET_TO_DISABLE) ? clk : 0;
regmap_update_bits(gate->map, ASPEED_CLK_STOP_CTRL, clk, enval);
spin_unlock_irqrestore(gate->lock, flags);
}
static const struct clk_ops aspeed_clk_gate_ops = {
.enable = aspeed_clk_enable,
.disable = aspeed_clk_disable,
.is_enabled = aspeed_clk_is_enabled,
};
/**
* struct aspeed_reset - Aspeed reset controller
* @map: regmap to access the containing system controller
* @rcdev: reset controller device
*/
struct aspeed_reset {
struct regmap *map;
struct reset_controller_dev rcdev;
};
#define to_aspeed_reset(p) container_of((p), struct aspeed_reset, rcdev)
static const u8 aspeed_resets[] = {
/* SCU04 resets */
[ASPEED_RESET_XDMA] = 25,
[ASPEED_RESET_MCTP] = 24,
[ASPEED_RESET_ADC] = 23,
[ASPEED_RESET_JTAG_MASTER] = 22,
[ASPEED_RESET_MIC] = 18,
[ASPEED_RESET_PWM] = 9,
[ASPEED_RESET_PECI] = 10,
[ASPEED_RESET_I2C] = 2,
[ASPEED_RESET_AHB] = 1,
/*
* SCUD4 resets start at an offset to separate them from
* the SCU04 resets.
*/
[ASPEED_RESET_CRT1] = ASPEED_RESET2_OFFSET + 5,
};
static int aspeed_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct aspeed_reset *ar = to_aspeed_reset(rcdev);
u32 reg = ASPEED_RESET_CTRL;
u32 bit = aspeed_resets[id];
if (bit >= ASPEED_RESET2_OFFSET) {
bit -= ASPEED_RESET2_OFFSET;
reg = ASPEED_RESET_CTRL2;
}
return regmap_update_bits(ar->map, reg, BIT(bit), 0);
}
static int aspeed_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct aspeed_reset *ar = to_aspeed_reset(rcdev);
u32 reg = ASPEED_RESET_CTRL;
u32 bit = aspeed_resets[id];
if (bit >= ASPEED_RESET2_OFFSET) {
bit -= ASPEED_RESET2_OFFSET;
reg = ASPEED_RESET_CTRL2;
}
return regmap_update_bits(ar->map, reg, BIT(bit), BIT(bit));
}
static int aspeed_reset_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct aspeed_reset *ar = to_aspeed_reset(rcdev);
u32 reg = ASPEED_RESET_CTRL;
u32 bit = aspeed_resets[id];
int ret, val;
if (bit >= ASPEED_RESET2_OFFSET) {
bit -= ASPEED_RESET2_OFFSET;
reg = ASPEED_RESET_CTRL2;
}
ret = regmap_read(ar->map, reg, &val);
if (ret)
return ret;
return !!(val & BIT(bit));
}
static const struct reset_control_ops aspeed_reset_ops = {
.assert = aspeed_reset_assert,
.deassert = aspeed_reset_deassert,
.status = aspeed_reset_status,
};
static struct clk_hw *aspeed_clk_hw_register_gate(struct device *dev,
const char *name, const char *parent_name, unsigned long flags,
struct regmap *map, u8 clock_idx, u8 reset_idx,
u8 clk_gate_flags, spinlock_t *lock)
{
struct aspeed_clk_gate *gate;
struct clk_init_data init;
struct clk_hw *hw;
int ret;
gate = kzalloc(sizeof(*gate), GFP_KERNEL);
if (!gate)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &aspeed_clk_gate_ops;
init.flags = flags;
init.parent_names = parent_name ? &parent_name : NULL;
init.num_parents = parent_name ? 1 : 0;
gate->map = map;
gate->clock_idx = clock_idx;
gate->reset_idx = reset_idx;
gate->flags = clk_gate_flags;
gate->lock = lock;
gate->hw.init = &init;
hw = &gate->hw;
ret = clk_hw_register(dev, hw);
if (ret) {
kfree(gate);
hw = ERR_PTR(ret);
}
return hw;
}
static int aspeed_clk_probe(struct platform_device *pdev)
{
const struct aspeed_clk_soc_data *soc_data;
struct device *dev = &pdev->dev;
struct aspeed_reset *ar;
struct regmap *map;
struct clk_hw *hw;
u32 val, rate;
int i, ret;
map = syscon_node_to_regmap(dev->of_node);
if (IS_ERR(map)) {
dev_err(dev, "no syscon regmap\n");
return PTR_ERR(map);
}
ar = devm_kzalloc(dev, sizeof(*ar), GFP_KERNEL);
if (!ar)
return -ENOMEM;
ar->map = map;
ar->rcdev.owner = THIS_MODULE;
ar->rcdev.nr_resets = ARRAY_SIZE(aspeed_resets);
ar->rcdev.ops = &aspeed_reset_ops;
ar->rcdev.of_node = dev->of_node;
ret = devm_reset_controller_register(dev, &ar->rcdev);
if (ret) {
dev_err(dev, "could not register reset controller\n");
return ret;
}
/* SoC generations share common layouts but have different divisors */
soc_data = of_device_get_match_data(dev);
if (!soc_data) {
dev_err(dev, "no match data for platform\n");
return -EINVAL;
}
/* UART clock div13 setting */
regmap_read(map, ASPEED_MISC_CTRL, &val);
if (val & UART_DIV13_EN)
rate = 24000000 / 13;
else
rate = 24000000;
/* TODO: Find the parent data for the uart clock */
hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_UART] = hw;
/*
* Memory controller (M-PLL) PLL. This clock is configured by the
* bootloader, and is exposed to Linux as a read-only clock rate.
*/
regmap_read(map, ASPEED_MPLL_PARAM, &val);
hw = soc_data->calc_pll("mpll", val);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_MPLL] = hw;
/* SD/SDIO clock divider (TODO: There's a gate too) */
hw = clk_hw_register_divider_table(dev, "sdio", "hpll", 0,
scu_base + ASPEED_CLK_SELECTION, 12, 3, 0,
soc_data->div_table,
&aspeed_clk_lock);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_SDIO] = hw;
/* MAC AHB bus clock divider */
hw = clk_hw_register_divider_table(dev, "mac", "hpll", 0,
scu_base + ASPEED_CLK_SELECTION, 16, 3, 0,
soc_data->mac_div_table,
&aspeed_clk_lock);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_MAC] = hw;
/* LPC Host (LHCLK) clock divider */
hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0,
scu_base + ASPEED_CLK_SELECTION, 20, 3, 0,
soc_data->div_table,
&aspeed_clk_lock);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_LHCLK] = hw;
/* P-Bus (BCLK) clock divider */
hw = clk_hw_register_divider_table(dev, "bclk", "hpll", 0,
scu_base + ASPEED_CLK_SELECTION_2, 0, 2, 0,
soc_data->div_table,
&aspeed_clk_lock);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_BCLK] = hw;
/* Fixed 24MHz clock */
hw = clk_hw_register_fixed_rate(NULL, "fixed-24m", "clkin",
0, 24000000);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[ASPEED_CLK_24M] = hw;
/*
* TODO: There are a number of clocks that not included in this driver
* as more information is required:
* D2-PLL
* D-PLL
* YCLK
* RGMII
* RMII
* UART[1..5] clock source mux
* Video Engine (ECLK) mux and clock divider
*/
for (i = 0; i < ARRAY_SIZE(aspeed_gates); i++) {
const struct aspeed_gate_data *gd = &aspeed_gates[i];
u32 gate_flags;
/* Special case: the USB port 1 clock (bit 14) is always
* working the opposite way from the other ones.
*/
gate_flags = (gd->clock_idx == 14) ? 0 : CLK_GATE_SET_TO_DISABLE;
hw = aspeed_clk_hw_register_gate(dev,
gd->name,
gd->parent_name,
gd->flags,
map,
gd->clock_idx,
gd->reset_idx,
gate_flags,
&aspeed_clk_lock);
if (IS_ERR(hw))
return PTR_ERR(hw);
aspeed_clk_data->hws[i] = hw;
}
return 0;
};
static const struct of_device_id aspeed_clk_dt_ids[] = {
{ .compatible = "aspeed,ast2400-scu", .data = &ast2400_data },
{ .compatible = "aspeed,ast2500-scu", .data = &ast2500_data },
{ }
};
static struct platform_driver aspeed_clk_driver = {
.probe = aspeed_clk_probe,
.driver = {
.name = "aspeed-clk",
.of_match_table = aspeed_clk_dt_ids,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(aspeed_clk_driver);
static void __init aspeed_ast2400_cc(struct regmap *map)
{
struct clk_hw *hw;
u32 val, div, clkin, hpll;
const u16 hpll_rates[][4] = {
{384, 360, 336, 408},
{400, 375, 350, 425},
};
int rate;
/*
* CLKIN is the crystal oscillator, 24, 48 or 25MHz selected by
* strapping
*/
regmap_read(map, ASPEED_STRAP, &val);
rate = (val >> 8) & 3;
if (val & CLKIN_25MHZ_EN) {
clkin = 25000000;
hpll = hpll_rates[1][rate];
} else if (val & AST2400_CLK_SOURCE_SEL) {
clkin = 48000000;
hpll = hpll_rates[0][rate];
} else {
clkin = 24000000;
hpll = hpll_rates[0][rate];
}
hw = clk_hw_register_fixed_rate(NULL, "clkin", NULL, 0, clkin);
pr_debug("clkin @%u MHz\n", clkin / 1000000);
/*
* High-speed PLL clock derived from the crystal. This the CPU clock,
* and we assume that it is enabled. It can be configured through the
* HPLL_PARAM register, or set to a specified frequency by strapping.
*/
regmap_read(map, ASPEED_HPLL_PARAM, &val);
if (val & AST2400_HPLL_PROGRAMMED)
hw = aspeed_ast2400_calc_pll("hpll", val);
else
hw = clk_hw_register_fixed_rate(NULL, "hpll", "clkin", 0,
hpll * 1000000);
aspeed_clk_data->hws[ASPEED_CLK_HPLL] = hw;
/*
* Strap bits 11:10 define the CPU/AHB clock frequency ratio (aka HCLK)
* 00: Select CPU:AHB = 1:1
* 01: Select CPU:AHB = 2:1
* 10: Select CPU:AHB = 4:1
* 11: Select CPU:AHB = 3:1
*/
regmap_read(map, ASPEED_STRAP, &val);
val = (val >> 10) & 0x3;
div = val + 1;
if (div == 3)
div = 4;
else if (div == 4)
div = 3;
hw = clk_hw_register_fixed_factor(NULL, "ahb", "hpll", 0, 1, div);
aspeed_clk_data->hws[ASPEED_CLK_AHB] = hw;
/* APB clock clock selection register SCU08 (aka PCLK) */
hw = clk_hw_register_divider_table(NULL, "apb", "hpll", 0,
scu_base + ASPEED_CLK_SELECTION, 23, 3, 0,
ast2400_div_table,
&aspeed_clk_lock);
aspeed_clk_data->hws[ASPEED_CLK_APB] = hw;
}
static void __init aspeed_ast2500_cc(struct regmap *map)
{
struct clk_hw *hw;
u32 val, freq, div;
/* CLKIN is the crystal oscillator, 24 or 25MHz selected by strapping */
regmap_read(map, ASPEED_STRAP, &val);
if (val & CLKIN_25MHZ_EN)
freq = 25000000;
else
freq = 24000000;
hw = clk_hw_register_fixed_rate(NULL, "clkin", NULL, 0, freq);
pr_debug("clkin @%u MHz\n", freq / 1000000);
/*
* High-speed PLL clock derived from the crystal. This the CPU clock,
* and we assume that it is enabled
*/
regmap_read(map, ASPEED_HPLL_PARAM, &val);
aspeed_clk_data->hws[ASPEED_CLK_HPLL] = aspeed_ast2500_calc_pll("hpll", val);
/* Strap bits 11:9 define the AXI/AHB clock frequency ratio (aka HCLK)*/
regmap_read(map, ASPEED_STRAP, &val);
val = (val >> 9) & 0x7;
WARN(val == 0, "strapping is zero: cannot determine ahb clock");
div = 2 * (val + 1);
hw = clk_hw_register_fixed_factor(NULL, "ahb", "hpll", 0, 1, div);
aspeed_clk_data->hws[ASPEED_CLK_AHB] = hw;
/* APB clock clock selection register SCU08 (aka PCLK) */
regmap_read(map, ASPEED_CLK_SELECTION, &val);
val = (val >> 23) & 0x7;
div = 4 * (val + 1);
hw = clk_hw_register_fixed_factor(NULL, "apb", "hpll", 0, 1, div);
aspeed_clk_data->hws[ASPEED_CLK_APB] = hw;
};
static void __init aspeed_cc_init(struct device_node *np)
{
struct regmap *map;
u32 val;
int ret;
int i;
scu_base = of_iomap(np, 0);
if (!scu_base)
return;
aspeed_clk_data = kzalloc(struct_size(aspeed_clk_data, hws,
ASPEED_NUM_CLKS),
GFP_KERNEL);
if (!aspeed_clk_data)
return;
/*
* This way all clocks fetched before the platform device probes,
* except those we assign here for early use, will be deferred.
*/
for (i = 0; i < ASPEED_NUM_CLKS; i++)
aspeed_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
map = syscon_node_to_regmap(np);
if (IS_ERR(map)) {
pr_err("no syscon regmap\n");
return;
}
/*
* We check that the regmap works on this very first access,
* but as this is an MMIO-backed regmap, subsequent regmap
* access is not going to fail and we skip error checks from
* this point.
*/
ret = regmap_read(map, ASPEED_STRAP, &val);
if (ret) {
pr_err("failed to read strapping register\n");
return;
}
if (of_device_is_compatible(np, "aspeed,ast2400-scu"))
aspeed_ast2400_cc(map);
else if (of_device_is_compatible(np, "aspeed,ast2500-scu"))
aspeed_ast2500_cc(map);
else
pr_err("unknown platform, failed to add clocks\n");
aspeed_clk_data->num = ASPEED_NUM_CLKS;
ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, aspeed_clk_data);
if (ret)
pr_err("failed to add DT provider: %d\n", ret);
};
CLK_OF_DECLARE_DRIVER(aspeed_cc_g5, "aspeed,ast2500-scu", aspeed_cc_init);
CLK_OF_DECLARE_DRIVER(aspeed_cc_g4, "aspeed,ast2400-scu", aspeed_cc_init);